Merge branch 'develop'

.gitignore

@@ -4,3 +4,4 @@ build
 nohup.out
 build_config.mk
 var
+_workspace

Godeps/Godeps.json

@@ -0,0 +1,54 @@
+{
+	"ImportPath": "github.com/siddontang/ledisdb",
+	"GoVersion": "go1.3.2",
+	"Packages": [
+		"./..."
+	],
+	"Deps": [
+		{
+			"ImportPath": "github.com/BurntSushi/toml",
+			"Rev": "2ceedfee35ad3848e49308ab0c9a4f640cfb5fb2"
+		},
+		{
+			"ImportPath": "github.com/boltdb/bolt",
+			"Comment": "data/v1-228-g8fb50d5",
+			"Rev": "8fb50d5ee57110936b904a7539d4c5f2bf2359db"
+		},
+		{
+			"ImportPath": "github.com/siddontang/go/bson",
+			"Rev": "466d5bc779ad45f5923d0f59efbc5d696bf2099c"
+		},
+		{
+			"ImportPath": "github.com/siddontang/go/filelock",
+			"Rev": "466d5bc779ad45f5923d0f59efbc5d696bf2099c"
+		},
+		{
+			"ImportPath": "github.com/siddontang/go/hack",
+			"Rev": "466d5bc779ad45f5923d0f59efbc5d696bf2099c"
+		},
+		{
+			"ImportPath": "github.com/siddontang/go/log",
+			"Rev": "466d5bc779ad45f5923d0f59efbc5d696bf2099c"
+		},
+		{
+			"ImportPath": "github.com/siddontang/go/num",
+			"Rev": "466d5bc779ad45f5923d0f59efbc5d696bf2099c"
+		},
+		{
+			"ImportPath": "github.com/siddontang/go/snappy",
+			"Rev": "466d5bc779ad45f5923d0f59efbc5d696bf2099c"
+		},
+		{
+			"ImportPath": "github.com/siddontang/goleveldb/leveldb",
+			"Rev": "c1f6d721561c48f467b26a277741e55fd224df1e"
+		},
+		{
+			"ImportPath": "github.com/szferi/gomdb",
+			"Rev": "d8a6d8371e2409b0787a782bf9b0c5daca364a3d"
+		},
+		{
+			"ImportPath": "github.com/ugorji/go/codec",
+			"Rev": "71c2886f5a673a35f909803f38ece5810165097b"
+		}
+	]
+}

Godeps/Readme

@@ -0,0 +1,5 @@
+This directory tree is generated automatically by godep.
+
+Please do not edit.
+
+See https://github.com/tools/godep for more information.

Makefile

@@ -16,13 +16,13 @@ export GO_BUILD_TAGS
 all: build  
 
 build:
-	go install -tags '$(GO_BUILD_TAGS)' ./...
+	$(GO) install -tags '$(GO_BUILD_TAGS)' ./...
 
 clean:
-	go clean -i ./...
+	$(GO) clean -i ./...
 
 test:
-	go test -tags '$(GO_BUILD_TAGS)' ./...
+	$(GO) test -tags '$(GO_BUILD_TAGS)' ./...
 
 pytest:
 	sh client/ledis-py/tests/all.sh

README.md

@@ -13,7 +13,7 @@ LedisDB now supports multiple databases as backend to store data, you can test a
 + Supports lua scripting.
 + Supports expiration and ttl.
 + Supports using redis-cli directly.
-+ Multiple client API supports, including Go, Python, Lua(Openresty), C/C++, Node.js. 
++ Multiple client API support, including Go, Python, Lua(Openresty), C/C++, Node.js. 
 + Easy to embed in your own Go application. 
 + Restful API support, json/bson/msgpack output.
 + Replication to guarantee data safe.
@@ -35,6 +35,9 @@ Create a workspace and checkout ledisdb source
     make
     make test
 
+## Godep support
+
+LedisDB supports building with [godep](https://github.com/tools/godep) which can manage LedisDB go dependence automatically.
 
 ## LevelDB support
 
@@ -60,7 +63,8 @@ Create a workspace and checkout ledisdb source
 + Set `ROCKSDB_DIR` and `SNAPPY_DIR` to the actual install path in `dev.sh`.
 + `make clean && make` 
 
-**Because RocksDB API may change sometimes, LedisDB may not build successfully. Now LedisDB supports RocksDB version 3.5 or newest master branch. **
+
+Because RocksDB API may change sometimes, LedisDB may not build successfully. Now LedisDB supports RocksDB version 3.5 or newest master branch.
 
 
 ## HyperLevelDB support
@@ -75,7 +79,7 @@ Create a workspace and checkout ledisdb source
 
 ## Choose store database
 
-LedisDB now supports goleveldb, lmdb, leveldb, rocksdb, boltdb, hyperleveldb. it will choose goleveldb as default to store data if you not set.
+LedisDB now supports goleveldb, lmdb, leveldb, rocksdb, boltdb, hyperleveldb, memory. it will use goleveldb as default to store data if you don't set.
 
 Choosing a store database to use is very simple, you have two ways:
 

bootstrap.sh

@@ -2,8 +2,13 @@
 
 . ./dev.sh
 
-go get github.com/siddontang/go-log/log
+# Test godep install
-go get github.com/siddontang/go-snappy/snappy
+godep path > /dev/null 2>&1
+if [ "$?" = 0 ]; then
+    GOPATH=`godep path`
+    godep restore
+    exit 0
+fi
 
 go get github.com/siddontang/goleveldb/leveldb
 
@@ -14,4 +19,9 @@ go get github.com/boltdb/bolt
 go get github.com/ugorji/go/codec
 go get github.com/BurntSushi/toml
 
-go get github.com/siddontang/go-bson/bson
+
+go get github.com/siddontang/go/bson
+go get github.com/siddontang/go/log
+go get github.com/siddontang/go/snappy
+go get github.com/siddontang/go/num
+go get github.com/siddontang/go/filelock

client/ledis-py/ledis/client.py

@@ -733,6 +733,70 @@ class Ledis(object):
         "Return the score of element ``value`` in sorted set ``name``"
         return self.execute_command('ZSCORE', name, value)
 
+    def zinterstore(self, dest, keys, aggregate=None):
+        """
+        Intersect multiple sorted sets specified by ``keys`` into
+        a new sorted set, ``dest``. Scores in the destination will be
+        aggregated based on the ``aggregate``, or SUM if none is provided.
+        """
+        return self._zaggregate('ZINTERSTORE', dest, keys, aggregate)
+
+    def zunionstore(self, dest, keys, aggregate=None):
+        """
+        Union multiple sorted sets specified by ``keys`` into
+        a new sorted set, ``dest``. Scores in the destination will be
+        aggregated based on the ``aggregate``, or SUM if none is provided.
+        """
+        return self._zaggregate('ZUNIONSTORE', dest, keys, aggregate)
+
+    def _zaggregate(self, command, dest, keys, aggregate=None):
+        pieces = [command, dest, len(keys)]
+        if isinstance(keys, dict):
+            keys, weights = iterkeys(keys), itervalues(keys)
+        else:
+            weights = None
+        pieces.extend(keys)
+        if weights:
+            pieces.append(Token('WEIGHTS'))
+            pieces.extend(weights)
+        if aggregate:
+            pieces.append(Token('AGGREGATE'))
+            pieces.append(aggregate)
+        return self.execute_command(*pieces)
+
+    def zrangebylex(self, name, min, max, start=None, num=None):
+        """
+        Return the lexicographical range of values from sorted set ``name``
+        between ``min`` and ``max``.
+
+        If ``start`` and ``num`` are specified, then return a slice of the
+        range.
+        """
+        if (start is not None and num is None) or \
+                (num is not None and start is None):
+            raise RedisError("``start`` and ``num`` must both be specified")
+        pieces = ['ZRANGEBYLEX', name, min, max]
+        if start is not None and num is not None:
+            pieces.extend([Token('LIMIT'), start, num])
+        return self.execute_command(*pieces)
+
+    def zremrangebylex(self, name, min, max):
+        """
+        Remove all elements in the sorted set ``name`` between the
+        lexicographical range specified by ``min`` and ``max``.
+
+        Returns the number of elements removed.
+        """
+        return self.execute_command('ZREMRANGEBYLEX', name, min, max)
+
+    def zlexcount(self, name, min, max):
+        """
+        Return the number of items in the sorted set ``name`` between the
+        lexicographical range ``min`` and ``max``.
+        """
+        return self.execute_command('ZLEXCOUNT', name, min, max)
+
+
     # SPECIAL COMMANDS SUPPORTED BY LEDISDB
     def zclear(self, name):
         "Delete key of ``name`` from sorted set"

client/nodejs/ledis/lib/commands.js

@@ -93,6 +93,9 @@ module.exports = [
 	"zscore",
     "zunionstore",
     "zinterstore",
+    "zrangebylex",
+    "zremrangebylex",
+    "zlexcount",
 
 
 	"zclear",

client/openresty/ledis.lua

@@ -95,6 +95,12 @@ local commands = {
     "zrevrank", 
     "zrevrangebyscore", 
     "zscore", 
+    "zunionstore",
+    "zinterstore",
+    "zrangebylex",
+    "zremrangebylex",
+    "zlexcount",
+    
     --[[ledisdb special commands]]
     "zclear", 
     "zmclear",

client/openresty/tx_test.lua

@@ -1,96 +0,0 @@
-local ledis = require "ledis"
-local lds = ledis:new()
-
-lds:set_timeout(1000)
-
-
-
-
--- connect
-local ok, err =  lds:connect("127.0.0.1", "6380")
-if not ok then
-	ngx.say("failed to connect:", err)
-	return
-end
-
-lds:del("tx")
-
--- transaction
-
-ok, err = lds:set("tx", "a")
-if not ok then
-	ngx.say("failed to execute set in tx: ", err)
-	return
-end
-
-ngx.say("SET should be OK <=>", ok)
-
-res, err = lds:get("tx")
-if not res then
-	ngx.say("failed to execute get in tx: ", err)
-	return
-end
-
-ngx.say("GET should be a <=>", res)
-
-
-
-ok, err = lds:begin()
-if not ok then
-	ngx.say("failed to run begin: ", err)
-	return
-end
-
-ngx.say("BEGIN should be OK <=>", ok)
-
-ok, err = lds:set("tx", "b")
-if not ok then
-	ngx.say("failed to execute set in tx: ", err)
-	return
-end
-
-ngx.say("SET should be OK <=>", ok)
-
-
-res, err = lds:get("tx")
-if not res then
-	ngx.say("failed to execute get in tx: ", err)
-	return
-end
-
-ngx.say("GET should be b <=>", res)
-
-ok, err = lds:rollback()
-if not ok then
-	ngx.say("failed to rollback", err)
-	return
-end
-ngx.say("ROLLBACK should be OK <=>", ok)
-
-res, err = lds:get("tx")
-if not res then
-	ngx.say("failed to execute get in tx: ", err)
-	return
-end
-
-ngx.say("GET should be a <=>", res)
-
-
-lds:begin()
-lds:set("tx", "c")
-lds:commit()
-res, err = lds:get("tx")
-if not res then
-	ngx.say("failed to execute get in tx: ", err)
-	return
-end
-
-ngx.say("GET should be c <=>", res)
-
-
-local ok, err = lds:close()
-if not ok then
-    ngx.say("failed to close: ", err)
-    return
-end
-ngx.say("close success")

cmd/ledis-binlog/main.go

@@ -1,85 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"flag"
-	"fmt"
-	"github.com/siddontang/ledisdb/ledis"
-	"os"
-	"time"
-)
-
-var TimeFormat = "2006-01-02 15:04:05"
-
-var startDateTime = flag.String("start-datetime", "",
-	"Start reading the binary log at the first event having a timestamp equal to or later than the datetime argument.")
-var stopDateTime = flag.String("stop-datetime", "",
-	"Stop reading the binary log at the first event having a timestamp equal to or earlier than the datetime argument.")
-
-var startTime uint32 = 0
-var stopTime uint32 = 0xFFFFFFFF
-
-func main() {
-	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage of %s [options] log_file\n", os.Args[0])
-		flag.PrintDefaults()
-	}
-
-	flag.Parse()
-
-	logFile := flag.Arg(0)
-	f, err := os.Open(logFile)
-	if err != nil {
-		println(err.Error())
-		return
-	}
-	defer f.Close()
-
-	var t time.Time
-
-	if len(*startDateTime) > 0 {
-		if t, err = time.Parse(TimeFormat, *startDateTime); err != nil {
-			println("parse start-datetime error: ", err.Error())
-			return
-		}
-
-		startTime = uint32(t.Unix())
-	}
-
-	if len(*stopDateTime) > 0 {
-		if t, err = time.Parse(TimeFormat, *stopDateTime); err != nil {
-			println("parse stop-datetime error: ", err.Error())
-			return
-		}
-
-		stopTime = uint32(t.Unix())
-	}
-
-	rb := bufio.NewReaderSize(f, 4096)
-	err = ledis.ReadEventFromReader(rb, printEvent)
-	if err != nil {
-		println("read event error: ", err.Error())
-		return
-	}
-}
-
-func printEvent(head *ledis.BinLogHead, event []byte) error {
-	if head.CreateTime < startTime || head.CreateTime > stopTime {
-		return nil
-	}
-
-	t := time.Unix(int64(head.CreateTime), 0)
-
-	fmt.Printf("%s ", t.Format(TimeFormat))
-
-	s, err := ledis.FormatBinLogEvent(event)
-	if err != nil {
-		fmt.Printf("%s", err.Error())
-	} else {
-		fmt.Printf(s)
-	}
-
-	fmt.Printf("\n")
-
-	return nil
-}

cmd/ledis-cli/const.go

@@ -1,4 +1,4 @@
-//This file was generated by .tools/generate_commands.py on Tue Sep 09 2014 09:48:57 +0800 
+//This file was generated by .tools/generate_commands.py on Thu Oct 02 2014 15:24:07 +0800 
 package main
 
 var helpCommands = [][]string{
@@ -86,7 +86,7 @@ var helpCommands = [][]string{
 	{"SINTER", "key [key ...]", "Set"},
 	{"SINTERSTORE", "destination key [key ...]", "Set"},
 	{"SISMEMBER", "key member", "Set"},
-	{"SLAVEOF", "host port", "Replication"},
+	{"SLAVEOF", "host port [restart]", "Replication"},
 	{"SMCLEAR", "key [key ...]", "Set"},
 	{"SMEMBERS", "key", "Set"},
 	{"SPERSIST", "key", "Set"},
@@ -95,7 +95,7 @@ var helpCommands = [][]string{
 	{"SUNION", "key [key ...]", "Set"},
 	{"SUNIONSTORE", "destination key [key ...]", "Set"},
 	{"SXSCAN", "key [MATCH match] [COUNT count]", "Set"},
-	{"SYNC", "index offset", "Replication"},
+	{"SYNC", "logid", "Replication"},
 	{"TTL", "key", "KV"},
 	{"XSCAN", "key [MATCH match] [COUNT count]", "KV"},
 	{"ZADD", "key score member [score member ...]", "ZSet"},
@@ -106,12 +106,15 @@ var helpCommands = [][]string{
 	{"ZEXPIREAT", "key timestamp", "ZSet"},
 	{"ZINCRBY", "key increment member", "ZSet"},
 	{"ZINTERSTORE", "destkey numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX]", "ZSet"},
+	{"ZLEXCOUNT", "key min max", "ZSet"},
 	{"ZMCLEAR", "key [key ...]", "ZSet"},
 	{"ZPERSIST", "key", "ZSet"},
 	{"ZRANGE", "key start stop [WITHSCORES]", "ZSet"},
+	{"ZRANGEBYLEX", "key min max [LIMIT offset count]", "ZSet"},
 	{"ZRANGEBYSCORE", "key min max [WITHSCORES] [LIMIT offset count]", "ZSet"},
 	{"ZRANK", "key member", "ZSet"},
 	{"ZREM", "key member [member ...]", "ZSet"},
+	{"ZREMRANGBYLEX", "key min max", "ZSet"},
 	{"ZREMRANGEBYRANK", "key start stop", "ZSet"},
 	{"ZREMRANGEBYSCORE", "key min max", "ZSet"},
 	{"ZREVRANGE", "key start stop [WITHSCORES]", "ZSet"},

cmd/ledis-load/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"flag"
-	"fmt"
 	"github.com/siddontang/ledisdb/config"
 	"github.com/siddontang/ledisdb/ledis"
 )
@@ -57,18 +56,6 @@ func loadDump(cfg *config.Config, ldb *ledis.Ledis) error {
 		return err
 	}
 
-	var head *ledis.BinLogAnchor
+	_, err = ldb.LoadDumpFile(*dumpPath)
-	head, err = ldb.LoadDumpFile(*dumpPath)
-
-	if err != nil {
 	return err
-	}
-
-	//master enable binlog, here output this like mysql
-	if head.LogFileIndex != 0 && head.LogPos != 0 {
-		format := "MASTER_LOG_FILE='binlog.%07d', MASTER_LOG_POS=%d;\n"
-		fmt.Printf(format, head.LogFileIndex, head.LogPos)
-	}
-
-	return nil
 }

config/config.go

@@ -16,14 +16,6 @@ const (
 	DefaultDataDir string = "./var"
 )
 
-const (
-	MaxBinLogFileSize int = 1024 * 1024 * 1024
-	MaxBinLogFileNum  int = 10000
-
-	DefaultBinLogFileSize int = MaxBinLogFileSize
-	DefaultBinLogFileNum  int = 10
-)
-
 type LevelDBConfig struct {
 	Compression     bool `toml:"compression"`
 	BlockSize       int  `toml:"block_size"`
@@ -37,9 +29,13 @@ type LMDBConfig struct {
 	NoSync  bool `toml:"nosync"`
 }
 
-type BinLogConfig struct {
+type ReplicationConfig struct {
-	MaxFileSize int `toml:"max_file_size"`
+	Path             string `toml:"path"`
-	MaxFileNum  int `toml:"max_file_num"`
+	ExpiredLogDays   int    `toml:"expired_log_days"`
+	Sync             bool   `toml:"sync"`
+	WaitSyncTime     int    `toml:"wait_sync_time"`
+	WaitMaxSlaveAcks int    `toml:"wait_max_slave_acks"`
+	Compression      bool   `toml:"compression"`
 }
 
 type Config struct {
@@ -47,19 +43,22 @@ type Config struct {
 
 	HttpAddr string `toml:"http_addr"`
 
+	SlaveOf string `toml:"slaveof"`
+
 	DataDir string `toml:"data_dir"`
 
 	DBName string `toml:"db_name"`
 
+	DBPath string `toml:"db_path"`
+
 	LevelDB LevelDBConfig `toml:"leveldb"`
 
 	LMDB LMDBConfig `toml:"lmdb"`
 
-	BinLog BinLogConfig `toml:"binlog"`
-
-	SlaveOf string `toml:"slaveof"`
-
 	AccessLog string `toml:"access_log"`
+
+	UseReplication bool              `toml:"use_replication"`
+	Replication    ReplicationConfig `toml:"replication"`
 }
 
 func NewConfigWithFile(fileName string) (*Config, error) {
@@ -92,11 +91,6 @@ func NewConfigDefault() *Config {
 
 	cfg.DBName = DefaultDBName
 
-	// disable binlog
-	cfg.BinLog.MaxFileNum = 0
-	cfg.BinLog.MaxFileSize = 0
-
-	// disable replication
 	cfg.SlaveOf = ""
 
 	// disable access log
@@ -105,6 +99,10 @@ func NewConfigDefault() *Config {
 	cfg.LMDB.MapSize = 20 * 1024 * 1024
 	cfg.LMDB.NoSync = true
 
+	cfg.Replication.WaitSyncTime = 1
+	cfg.Replication.Compression = true
+	cfg.Replication.WaitMaxSlaveAcks = 2
+
 	return cfg
 }
 
@@ -125,17 +123,3 @@ func (cfg *LevelDBConfig) Adjust() {
 		cfg.MaxOpenFiles = 1024
 	}
 }
-
-func (cfg *BinLogConfig) Adjust() {
-	if cfg.MaxFileSize <= 0 {
-		cfg.MaxFileSize = DefaultBinLogFileSize
-	} else if cfg.MaxFileSize > MaxBinLogFileSize {
-		cfg.MaxFileSize = MaxBinLogFileSize
-	}
-
-	if cfg.MaxFileNum <= 0 {
-		cfg.MaxFileNum = DefaultBinLogFileNum
-	} else if cfg.MaxFileNum > MaxBinLogFileNum {
-		cfg.MaxFileNum = MaxBinLogFileNum
-	}
-}

config/config.toml

@@ -13,6 +13,7 @@ data_dir = "/tmp/ledis_server"
 access_log = ""
 
 # Set slaveof to enable replication from master, empty, no replication
+# Any write operations except flushall and replication will be disabled in slave mode.
 slaveof = ""
 
 # Choose which backend storage to use, now support:
@@ -27,6 +28,12 @@ slaveof = ""
 #   
 db_name = "leveldb"
 
+# If not set, use data_dir/"db_name"_data
+db_path = ""
+
+# enable replication or not
+use_replication = true
+
 [leveldb]
 compression = false
 block_size = 32768
@@ -38,8 +45,25 @@ max_open_files = 1024
 map_size = 524288000
 nosync = true
 
-[binlog]
+[replication]
-max_file_size = 0
+# Path to store replication information(write ahead log, commit log, etc.)
-max_file_num = 0
+# if not set, use data_dir/rpl 
+path = ""
 
+# Expire write ahead logs after the given days
+expired_log_days = 7
 
+# If sync is true, the new log must be sent to some slaves, and then commit. 
+# It will reduce performance but have better high availability. 
+sync = true
+
+# If sync is true, wait at last wait_sync_time seconds for slave syncing this log
+wait_sync_time = 1
+
+# If sync is true, wait at most min(wait_max_slave_acks, (n + 1) / 2) to promise syncing ok.
+# n is slave number
+# If 0, wait (n + 1) / 2 acks.
+wait_max_slave_acks = 2
+
+# Compress the log or not
+compression = true

config/config_test.go

@@ -1,31 +1,13 @@
 package config
 
 import (
-	"reflect"
 	"testing"
 )
 
 func TestConfig(t *testing.T) {
-	dstCfg := new(Config)
+	_, err := NewConfigWithFile("./ledis.toml")
-	dstCfg.Addr = "127.0.0.1:6380"
-	dstCfg.HttpAddr = "127.0.0.1:11181"
-	dstCfg.DataDir = "/tmp/ledis_server"
-	dstCfg.DBName = "leveldb"
-
-	dstCfg.LevelDB.Compression = false
-	dstCfg.LevelDB.BlockSize = 32768
-	dstCfg.LevelDB.WriteBufferSize = 67108864
-	dstCfg.LevelDB.CacheSize = 524288000
-	dstCfg.LevelDB.MaxOpenFiles = 1024
-	dstCfg.LMDB.MapSize = 524288000
-	dstCfg.LMDB.NoSync = true
-
-	cfg, err := NewConfigWithFile("./config.toml")
 	if err != nil {
 		t.Fatal(err)
 	}
 
-	if !reflect.DeepEqual(dstCfg, cfg) {
-		t.Fatal("parse toml error")
-	}
 }

doc/Replication.md

@@ -0,0 +1,76 @@
+At first, LedisDB uses BinLog (like MySQL BinLog) to support replication. Slave syncs logs from Master with specified BinLog filename and position. It is simple but not suitable for some cases. 
+
+Let's assume below scenario: A -> B and A -> C, here A is master, B and C are slaves. -> means "replicates to". If master A failed, we must select B or C as the new master. Usually, we must choose the one which has most up to date from A, but it is not easy to check which one is it.
+
+MySQL has the same problem for this, so from MySQL 5.6, it introduces GTID (Global Transaction ID) to solve it. GTID is very powerful but a little complex, I just want to a simple and easy solution.
+
+Before GTID, Google has supplied a solution called [Global Transaction IDs](https://code.google.com/p/google-mysql-tools/wiki/GlobalTransactionIds) which uses a monotonically increasing group id to represent an unique transaction event in BinLog. Although it has some limitations for MySQL hierarchical replication, I still think using a integer id like group id for log event is simple and suitable for LedisDB.
+
+Another implementation influencing me is [Raft](http://raftconsensus.github.io/), a consensus algorithm based on the replicated log. Leader must ensure that some followers receive the replicated log before executing the commands in log. The log has an unique log id (like group id above), if the leader failed, the candidate which has the up to date log (checked by log id) will be elected a new leader. 
+
+Refer above, I supply a simple solution for LedisDB's replication.
+
+## Keyword
+
++ LogID: a monotonically increasing integer for a log
++ FirstLogID: the oldest log id for a server, all the logs before this id have been purged.
++ LastLogID: the newest log id for a server.
++ CommitID: the last log committed to execute. If LastLogID is 10 and CommitID is 5, server needs to commit logs from 6 - 10 to catch the up to date status.
+
+## Sync Flow
+
+For a master, every write changes will be handled below:
+
+1. Logs the changes to disk, it will calculate a new LogID based on LastLogID.
+2. Sends this log to slaves and waits the ACK from slaves or timeout.
+3. Commits to execute the changes.
+4. Updates the CommitID to the LogID.
+
+For a slave:
+
+1. Connects to master and tells it which log to sync by LogID, it may have below cases:
+    
+    + The LogID is less than master's FirstLogID, master will tell slave log has been purged, the slave must do a full sync from master first.
+    + The master has this log and will send it to slave.
+    + The master has not this log (The slave has up to date with master). Slave will wait for some time or timeout then to start a new sync.
+
+2. After slave receiving a log (eg. LogID 10), it will save this log to disk and notice the replication thread to handle it.
+3. Slave will start a new sync with LogID 11.
+
+
+## Full Sync Flow
+
+If slave syncs a log but master has purged it, slave has to start a full sync.
+
++ Master generates a snapshot with current LastLogID and dumps to a file.
++ Slave discards all old data and replicated logs, then loads the dump file and updates CommitID with LastLogID in dump file.
++ Slave starts to sync with LogID = CommitID + 1.
+
+## ReadOnly
+
+Slave is always read only, which means that any write operations will be denied except `FlushAll` and replication.
+
+For a master, if it first writes log OK but commits or updates CommitID error, it will also turn into read only mode until replication thread executes this log correctly.
+
+## Strong Consensus Replication
+
+For the sync flow, we see that master will wait some slaves to return an ACK telling it has received the log, this mechanism implements strong consensus replication. If master failed, we can choose a slave which has up to date data with the master. 
+
+You must notice that this feature has a big influence on the performance. Use your own risk!
+
+## Use 
+
+Using replication is very simple for LedisDB, only using `slaveof` command.
+
++ Use `slaveof host port` to enable replication from master at "host:port".
++ Use `slaveof no one` to stop replication and change the slave to master. 
+
+If a slave first syncs from a master A, then uses `slaveof` to sync from master B, it will sync with the LogID = LastLogID + 1. If you want to start over from B, you must use `slaveof host port restart` which will start a full sync first. 
+
+## Limitation
+
++ Multi-Master is not supported.
++ Replication can not store log less than current LastLogID.
++ Circular replication is not supported.
++ Master and slave must set `use_replication` to true to support replication.
+

doc/commands.json

@@ -301,12 +301,12 @@
         "readonly": false
     },
     "SLAVEOF": {
-        "arguments": "host port",
+        "arguments": "host port [restart]",
         "group": "Replication",
         "readonly": false
     },
     "SYNC": {
-        "arguments": "index offset",
+        "arguments": "logid",
         "group": "Replication",
         "readonly": false
     },
@@ -512,6 +512,24 @@
         "readonly": false
     },
 
+    "ZRANGEBYLEX":{
+        "arguments": "key min max [LIMIT offset count]",
+        "group": "ZSet",
+        "readonly": true
+    },
+
+    "ZREMRANGBYLEX":{
+        "arguments": "key min max",
+        "group": "ZSet",
+        "readonly": false
+    },
+
+    "ZLEXCOUNT":{
+        "arguments": "key min max",
+        "group": "ZSet",
+        "readonly": true
+    },
+
     "BEGIN": {
         "arguments": "-",
         "group": "Transaction",

doc/commands.md

@@ -106,6 +106,9 @@ Table of Contents
     - [ZINTERSTORE destination numkeys key [key ...] [WEIGHTS weight [weight ...]] [AGGREGATE SUM|MIN|MAX]
 ](#zinterstore-destination-numkeys-key-key--weights-weight-weight--aggregate-summinmax)
 	- [ZXSCAN key [MATCH match] [COUNT count]](#zxscan-key-match-match-count-count)
+	- [ZRANGEBYLEX key min max [LIMIT offset count]](#zrangebylex-key-min-max-limit-offset-count)
+	- [ZREMRANGEBYLEX key min max](#zremrangebylex-key-min-max)
+	- [ZLEXCOUNT key min max](#zlexcount-key-min-max)
 - [Bitmap](#bitmap)
 	- [BGET key](#bget-key)
 	- [BGETBIT key offset](#bgetbit-key-offset)
@@ -119,9 +122,9 @@ Table of Contents
 	- [BPERSIST key](#bpersist-key)
 	- [BXSCAN key [MATCH match] [COUNT count]](#bxscan-key-match-match-count-count)
 - [Replication](#replication)
-	- [SLAVEOF host port](#slaveof-host-port)
+	- [SLAVEOF host port [restart]](#slaveof-host-port-restart)
 	- [FULLSYNC](#fullsync)
-	- [SYNC index offset](#sync-index-offset)
+	- [SYNC logid](#sync-logid)
 - [Server](#server)
 	- [PING](#ping)
 	- [ECHO message](#echo-message)
@@ -2227,10 +2230,75 @@ Iterate ZSet keys incrementally.
 
 See [XSCAN](#xscan-key-match-match-count-count) for more information.
 
+### ZRANGEBYLEX key min max [LIMIT offset count]
+
+When all the elements in a sorted set are inserted with the same score, in order to force lexicographical ordering, this command returns all the elements in the sorted set at key with a value between min and max.
+
+If the elements in the sorted set have different scores, the returned elements are unspecified.
+
+Valid start and stop must start with ( or [, in order to specify if the range item is respectively exclusive or inclusive. The special values of + or - for start and stop have the special meaning or positively infinite and negatively infinite strings, so for instance the command ZRANGEBYLEX myzset - + is guaranteed to return all the elements in the sorted set, if all the elements have the same score.
+
+**Return value**
+
+array: list of elements in the specified score range
+
+**Example**
+
+```
+ledis> ZADD myzset 0 a 0 b 0 c 0 d 0 e 0 f 0 g
+(integer) 7
+ledis> ZRANGEBYLEX myzset - [c
+1) "a"
+2) "b"
+3) "c"
+ledis> ZRANGEBYLEX myzset - (c
+1) "a"
+2) "b"
+ledis> ZRANGEBYLEX myzset [aaa (g
+1) "b"
+2) "c"
+3) "d"
+4) "e"
+5) "f"
+```
+
+### ZREMRANGEBYLEX key min max
+
+Removes all elements in the sorted set stored at key between the lexicographical range specified by min and max.
+
+**Return value**
+
+int64: he number of elements removed.
+
+**Example**
+
+```
+ledis> ZADD myzset 0 a 0 b 0 c 0 d 0 e 0 f 0 g
+(integer) 7
+ledis> ZREMRANGEBYLEX myzset - [c
+(integer) 3
+```
+
+### ZLEXCOUNT key min max
+
+Returns the number of elements in the sorted set at key with a value between min and max.
+
+**Return value**
+
+int64: the number of elements in the specified score range.
+
+**Example**
+
+```
+ledis> ZADD myzset 0 a 0 b 0 c 0 d 0 e 0 f 0 g
+(integer) 7
+ledis> ZLEXCOUNT myzset - [c
+(integer) 3
+```
+
 
 ## Bitmap
 
-
 ### BGET key
 
 Returns the whole binary data stored at `key`.
@@ -2396,13 +2464,13 @@ See [XSCAN](#xscan-key-match-match-count-count) for more information.
 
 ## Replication
 
-### SLAVEOF host port
+### SLAVEOF host port [restart]
 
 Changes the replication settings of a slave on the fly. If the server is already acting as slave, SLAVEOF NO ONE will turn off the replication.
 
 SLAVEOF host port will make the server a slave of another server listening at the specified host and port.
 
-If a server is already a slave of a master, SLAVEOF host port will stop the replication against the old and start the synchronization against the new one, discarding the old dataset.
+If a server is already a slave of a master, SLAVEOF host port will stop the replication against the old and start the synchronization against the new one, if restart is set, it will discard the old dataset, otherwise it will sync with LastLogID + 1. 
 
 
 ### FULLSYNC
@@ -2416,9 +2484,9 @@ FULLSYNC will first try to sync all data from the master, save in local disk, th
 **Examples**
 
 
-### SYNC index offset
+### SYNC logid
 
-Inner command, syncs the new changed from master set by SLAVEOF at offset in binlog.index file.
+Inner command, syncs the new changed from master set by SLAVEOF with logid.
 
 **Return value**
 
@@ -2478,7 +2546,7 @@ ERR invalid db index 16
 
 ### FLUSHALL
 
-Delete all the keys of all the existing databases, not just the currently selected one. This command never fails.
+Delete all the keys of all the existing databases and replication logs, not just the currently selected one. This command never fails.
 
 Very dangerous to use!!!
 

etc/ledis.conf

@@ -1,7 +1,5 @@
 # LedisDB configuration
 
-# Config format is toml, https://github.com/toml-lang/toml
-
 # Server listen address
 addr = "127.0.0.1:6380"
 
@@ -15,6 +13,7 @@ data_dir = "/tmp/ledis_server"
 access_log = ""
 
 # Set slaveof to enable replication from master, empty, no replication
+# Any write operations except flushall and replication will be disabled in slave mode.
 slaveof = ""
 
 # Choose which backend storage to use, now support:
@@ -29,6 +28,12 @@ slaveof = ""
 #   
 db_name = "leveldb"
 
+# If not set, use data_dir/"db_name"_data
+db_path = ""
+
+# enable replication or not
+use_replication = true
+
 [leveldb]
 compression = false
 block_size = 32768
@@ -40,9 +45,25 @@ max_open_files = 1024
 map_size = 524288000
 nosync = true
 
-[binlog]
+[replication]
-# Set either size or num to 0 to disable binlog
+# Path to store replication information(write ahead log, commit log, etc.)
-max_file_size = 0
+# if not set, use data_dir/rpl 
-max_file_num = 0
+path = ""
 
+# Expire write ahead logs after the given days
+expired_log_days = 7
 
+# If sync is true, the new log must be sent to some slaves, and then commit. 
+# It will reduce performance but have better high availability. 
+sync = true
+
+# If sync is true, wait at last wait_sync_time seconds for slave syncing this log
+wait_sync_time = 1
+
+# If sync is true, wait at most min(wait_max_slave_acks, (n + 1) / 2) to promise syncing ok.
+# n is slave number
+# If 0, wait (n + 1) / 2 acks.
+wait_max_slave_acks = 2
+
+# Compress the log or not
+compression = true

ledis/batch.go

@@ -1,6 +1,8 @@
 package ledis
 
 import (
+	"github.com/siddontang/go/log"
+	"github.com/siddontang/ledisdb/rpl"
 	"github.com/siddontang/ledisdb/store"
 	"sync"
 )
@@ -12,29 +14,24 @@ type batch struct {
 
 	sync.Locker
 
-	logs [][]byte
-
 	tx *Tx
+
+	eb *eventBatch
 }
 
 func (b *batch) Commit() error {
-	b.l.commitLock.Lock()
+	if b.l.IsReadOnly() {
-	defer b.l.commitLock.Unlock()
+		return ErrWriteInROnly
+	}
 
-	err := b.WriteBatch.Commit()
-
-	if b.l.binlog != nil {
-		if err == nil {
 	if b.tx == nil {
-				b.l.binlog.Log(b.logs...)
+		return b.l.handleCommit(b.eb, b.WriteBatch)
 	} else {
-				b.tx.logs = append(b.tx.logs, b.logs...)
+		if b.l.r != nil {
+			b.tx.eb.Write(b.eb.Bytes())
 		}
+		return b.WriteBatch.Commit()
 	}
-		b.logs = [][]byte{}
-	}
-
-	return err
 }
 
 func (b *batch) Lock() {
@@ -42,26 +39,25 @@ func (b *batch) Lock() {
 }
 
 func (b *batch) Unlock() {
-	if b.l.binlog != nil {
+	b.eb.Reset()
-		b.logs = [][]byte{}
+
-	}
 	b.WriteBatch.Rollback()
 	b.Locker.Unlock()
 }
 
 func (b *batch) Put(key []byte, value []byte) {
-	if b.l.binlog != nil {
+	if b.l.r != nil {
-		buf := encodeBinLogPut(key, value)
+		b.eb.Put(key, value)
-		b.logs = append(b.logs, buf)
 	}
+
 	b.WriteBatch.Put(key, value)
 }
 
 func (b *batch) Delete(key []byte) {
-	if b.l.binlog != nil {
+	if b.l.r != nil {
-		buf := encodeBinLogDelete(key)
+		b.eb.Delete(key)
-		b.logs = append(b.logs, buf)
 	}
+
 	b.WriteBatch.Delete(key)
 }
 
@@ -97,9 +93,46 @@ func (l *Ledis) newBatch(wb store.WriteBatch, locker sync.Locker, tx *Tx) *batch
 	b.l = l
 	b.WriteBatch = wb
 
-	b.tx = tx
 	b.Locker = locker
 
-	b.logs = [][]byte{}
+	b.tx = tx
+	b.eb = new(eventBatch)
+
 	return b
 }
+
+type commiter interface {
+	Commit() error
+}
+
+func (l *Ledis) handleCommit(eb *eventBatch, c commiter) error {
+	l.commitLock.Lock()
+	defer l.commitLock.Unlock()
+
+	var err error
+	if l.r != nil {
+		var rl *rpl.Log
+		if rl, err = l.r.Log(eb.Bytes()); err != nil {
+			log.Fatal("write wal error %s", err.Error())
+			return err
+		}
+
+		l.propagate(rl)
+
+		if err = c.Commit(); err != nil {
+			log.Fatal("commit error %s", err.Error())
+			l.noticeReplication()
+			return err
+		}
+
+		if err = l.r.UpdateCommitID(rl.ID); err != nil {
+			log.Fatal("update commit id error %s", err.Error())
+			l.noticeReplication()
+			return err
+		}
+
+		return nil
+	} else {
+		return c.Commit()
+	}
+}

ledis/binlog.go

@@ -1,400 +0,0 @@
-package ledis
-
-import (
-	"bufio"
-	"encoding/binary"
-	"fmt"
-	"github.com/siddontang/go-log/log"
-	"github.com/siddontang/ledisdb/config"
-	"io"
-	"io/ioutil"
-	"os"
-	"path"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-)
-
-type BinLogHead struct {
-	CreateTime uint32
-	BatchId    uint32
-	PayloadLen uint32
-}
-
-func (h *BinLogHead) Len() int {
-	return 12
-}
-
-func (h *BinLogHead) Write(w io.Writer) error {
-	if err := binary.Write(w, binary.BigEndian, h.CreateTime); err != nil {
-		return err
-	}
-
-	if err := binary.Write(w, binary.BigEndian, h.BatchId); err != nil {
-		return err
-	}
-
-	if err := binary.Write(w, binary.BigEndian, h.PayloadLen); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (h *BinLogHead) handleReadError(err error) error {
-	if err == io.EOF {
-		return io.ErrUnexpectedEOF
-	} else {
-		return err
-	}
-}
-
-func (h *BinLogHead) Read(r io.Reader) error {
-	var err error
-	if err = binary.Read(r, binary.BigEndian, &h.CreateTime); err != nil {
-		return err
-	}
-
-	if err = binary.Read(r, binary.BigEndian, &h.BatchId); err != nil {
-		return h.handleReadError(err)
-	}
-
-	if err = binary.Read(r, binary.BigEndian, &h.PayloadLen); err != nil {
-		return h.handleReadError(err)
-	}
-
-	return nil
-}
-
-func (h *BinLogHead) InSameBatch(ho *BinLogHead) bool {
-	if h.CreateTime == ho.CreateTime && h.BatchId == ho.BatchId {
-		return true
-	} else {
-		return false
-	}
-}
-
-/*
-index file format:
-ledis-bin.00001
-ledis-bin.00002
-ledis-bin.00003
-
-log file format
-
-Log: Head|PayloadData
-
-Head: createTime|batchId|payloadData
-
-*/
-
-type BinLog struct {
-	sync.Mutex
-
-	path string
-
-	cfg *config.BinLogConfig
-
-	logFile *os.File
-
-	logWb *bufio.Writer
-
-	indexName    string
-	logNames     []string
-	lastLogIndex int64
-
-	batchId uint32
-
-	ch chan struct{}
-}
-
-func NewBinLog(cfg *config.Config) (*BinLog, error) {
-	l := new(BinLog)
-
-	l.cfg = &cfg.BinLog
-	l.cfg.Adjust()
-
-	l.path = path.Join(cfg.DataDir, "binlog")
-
-	if err := os.MkdirAll(l.path, 0755); err != nil {
-		return nil, err
-	}
-
-	l.logNames = make([]string, 0, 16)
-
-	l.ch = make(chan struct{})
-
-	if err := l.loadIndex(); err != nil {
-		return nil, err
-	}
-
-	return l, nil
-}
-
-func (l *BinLog) flushIndex() error {
-	data := strings.Join(l.logNames, "\n")
-
-	bakName := fmt.Sprintf("%s.bak", l.indexName)
-	f, err := os.OpenFile(bakName, os.O_WRONLY|os.O_CREATE, 0644)
-	if err != nil {
-		log.Error("create binlog bak index error %s", err.Error())
-		return err
-	}
-
-	if _, err := f.WriteString(data); err != nil {
-		log.Error("write binlog index error %s", err.Error())
-		f.Close()
-		return err
-	}
-
-	f.Close()
-
-	if err := os.Rename(bakName, l.indexName); err != nil {
-		log.Error("rename binlog bak index error %s", err.Error())
-		return err
-	}
-
-	return nil
-}
-
-func (l *BinLog) loadIndex() error {
-	l.indexName = path.Join(l.path, fmt.Sprintf("ledis-bin.index"))
-	if _, err := os.Stat(l.indexName); os.IsNotExist(err) {
-		//no index file, nothing to do
-	} else {
-		indexData, err := ioutil.ReadFile(l.indexName)
-		if err != nil {
-			return err
-		}
-
-		lines := strings.Split(string(indexData), "\n")
-		for _, line := range lines {
-			line = strings.Trim(line, "\r\n ")
-			if len(line) == 0 {
-				continue
-			}
-
-			if _, err := os.Stat(path.Join(l.path, line)); err != nil {
-				log.Error("load index line %s error %s", line, err.Error())
-				return err
-			} else {
-				l.logNames = append(l.logNames, line)
-			}
-		}
-	}
-	if l.cfg.MaxFileNum > 0 && len(l.logNames) > l.cfg.MaxFileNum {
-		//remove oldest logfile
-		if err := l.Purge(len(l.logNames) - l.cfg.MaxFileNum); err != nil {
-			return err
-		}
-	}
-
-	var err error
-	if len(l.logNames) == 0 {
-		l.lastLogIndex = 1
-	} else {
-		lastName := l.logNames[len(l.logNames)-1]
-
-		if l.lastLogIndex, err = strconv.ParseInt(path.Ext(lastName)[1:], 10, 64); err != nil {
-			log.Error("invalid logfile name %s", err.Error())
-			return err
-		}
-
-		//like mysql, if server restart, a new binlog will create
-		l.lastLogIndex++
-	}
-
-	return nil
-}
-
-func (l *BinLog) getLogFile() string {
-	return l.FormatLogFileName(l.lastLogIndex)
-}
-
-func (l *BinLog) openNewLogFile() error {
-	var err error
-	lastName := l.getLogFile()
-
-	logPath := path.Join(l.path, lastName)
-	if l.logFile, err = os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY, 0644); err != nil {
-		log.Error("open new logfile error %s", err.Error())
-		return err
-	}
-
-	if l.cfg.MaxFileNum > 0 && len(l.logNames) == l.cfg.MaxFileNum {
-		l.purge(1)
-	}
-
-	l.logNames = append(l.logNames, lastName)
-
-	if l.logWb == nil {
-		l.logWb = bufio.NewWriterSize(l.logFile, 1024)
-	} else {
-		l.logWb.Reset(l.logFile)
-	}
-
-	if err = l.flushIndex(); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (l *BinLog) checkLogFileSize() bool {
-	if l.logFile == nil {
-		return false
-	}
-
-	st, _ := l.logFile.Stat()
-	if st.Size() >= int64(l.cfg.MaxFileSize) {
-		l.closeLog()
-		return true
-	}
-
-	return false
-}
-
-func (l *BinLog) closeLog() {
-	if l.logFile == nil {
-		return
-	}
-
-	l.lastLogIndex++
-
-	l.logFile.Close()
-	l.logFile = nil
-}
-
-func (l *BinLog) purge(n int) {
-	if len(l.logNames) < n {
-		n = len(l.logNames)
-	}
-	for i := 0; i < n; i++ {
-		logPath := path.Join(l.path, l.logNames[i])
-		os.Remove(logPath)
-	}
-
-	copy(l.logNames[0:], l.logNames[n:])
-	l.logNames = l.logNames[0 : len(l.logNames)-n]
-}
-
-func (l *BinLog) Close() {
-	if l.logFile != nil {
-		l.logFile.Close()
-		l.logFile = nil
-	}
-}
-
-func (l *BinLog) LogNames() []string {
-	return l.logNames
-}
-
-func (l *BinLog) LogFileName() string {
-	return l.getLogFile()
-}
-
-func (l *BinLog) LogFilePos() int64 {
-	if l.logFile == nil {
-		return 0
-	} else {
-		st, _ := l.logFile.Stat()
-		return st.Size()
-	}
-}
-
-func (l *BinLog) LogFileIndex() int64 {
-	return l.lastLogIndex
-}
-
-func (l *BinLog) FormatLogFileName(index int64) string {
-	return fmt.Sprintf("ledis-bin.%07d", index)
-}
-
-func (l *BinLog) FormatLogFilePath(index int64) string {
-	return path.Join(l.path, l.FormatLogFileName(index))
-}
-
-func (l *BinLog) LogPath() string {
-	return l.path
-}
-
-func (l *BinLog) Purge(n int) error {
-	l.Lock()
-	defer l.Unlock()
-
-	if len(l.logNames) == 0 {
-		return nil
-	}
-
-	if n >= len(l.logNames) {
-		n = len(l.logNames)
-		//can not purge current log file
-		if l.logNames[n-1] == l.getLogFile() {
-			n = n - 1
-		}
-	}
-
-	l.purge(n)
-
-	return l.flushIndex()
-}
-
-func (l *BinLog) PurgeAll() error {
-	l.Lock()
-	defer l.Unlock()
-
-	l.closeLog()
-
-	l.purge(len(l.logNames))
-
-	return l.openNewLogFile()
-}
-
-func (l *BinLog) Log(args ...[]byte) error {
-	l.Lock()
-	defer l.Unlock()
-
-	var err error
-
-	if l.logFile == nil {
-		if err = l.openNewLogFile(); err != nil {
-			return err
-		}
-	}
-
-	head := &BinLogHead{}
-
-	head.CreateTime = uint32(time.Now().Unix())
-	head.BatchId = l.batchId
-
-	l.batchId++
-
-	for _, data := range args {
-		head.PayloadLen = uint32(len(data))
-
-		if err := head.Write(l.logWb); err != nil {
-			return err
-		}
-
-		if _, err := l.logWb.Write(data); err != nil {
-			return err
-		}
-	}
-
-	if err = l.logWb.Flush(); err != nil {
-		log.Error("write log error %s", err.Error())
-		return err
-	}
-
-	l.checkLogFileSize()
-
-	close(l.ch)
-	l.ch = make(chan struct{})
-
-	return nil
-}
-
-func (l *BinLog) Wait() <-chan struct{} {
-	return l.ch
-}

ledis/binlog_test.go

@@ -1,49 +0,0 @@
-package ledis
-
-import (
-	"github.com/siddontang/ledisdb/config"
-	"io/ioutil"
-	"os"
-	"testing"
-)
-
-func TestBinLog(t *testing.T) {
-	cfg := new(config.Config)
-
-	cfg.BinLog.MaxFileNum = 1
-	cfg.BinLog.MaxFileSize = 1024
-	cfg.DataDir = "/tmp/ledis_binlog"
-
-	os.RemoveAll(cfg.DataDir)
-
-	b, err := NewBinLog(cfg)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if err := b.Log(make([]byte, 1024)); err != nil {
-		t.Fatal(err)
-	}
-
-	if err := b.Log(make([]byte, 1024)); err != nil {
-		t.Fatal(err)
-	}
-
-	if fs, err := ioutil.ReadDir(b.LogPath()); err != nil {
-		t.Fatal(err)
-	} else if len(fs) != 2 {
-		t.Fatal(len(fs))
-	}
-
-	if err := b.PurgeAll(); err != nil {
-		t.Fatal(err)
-	}
-
-	if fs, err := ioutil.ReadDir(b.LogPath()); err != nil {
-		t.Fatal(err)
-	} else if len(fs) != 2 {
-		t.Fatal(len(fs))
-	} else if b.LogFilePos() != 0 {
-		t.Fatal(b.LogFilePos())
-	}
-}

ledis/binlog_util.go

@@ -1,215 +0,0 @@
-package ledis
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"strconv"
-)
-
-var (
-	errBinLogDeleteType  = errors.New("invalid bin log delete type")
-	errBinLogPutType     = errors.New("invalid bin log put type")
-	errBinLogCommandType = errors.New("invalid bin log command type")
-)
-
-func encodeBinLogDelete(key []byte) []byte {
-	buf := make([]byte, 1+len(key))
-	buf[0] = BinLogTypeDeletion
-	copy(buf[1:], key)
-	return buf
-}
-
-func decodeBinLogDelete(sz []byte) ([]byte, error) {
-	if len(sz) < 1 || sz[0] != BinLogTypeDeletion {
-		return nil, errBinLogDeleteType
-	}
-
-	return sz[1:], nil
-}
-
-func encodeBinLogPut(key []byte, value []byte) []byte {
-	buf := make([]byte, 3+len(key)+len(value))
-	buf[0] = BinLogTypePut
-	pos := 1
-	binary.BigEndian.PutUint16(buf[pos:], uint16(len(key)))
-	pos += 2
-	copy(buf[pos:], key)
-	pos += len(key)
-	copy(buf[pos:], value)
-
-	return buf
-}
-
-func decodeBinLogPut(sz []byte) ([]byte, []byte, error) {
-	if len(sz) < 3 || sz[0] != BinLogTypePut {
-		return nil, nil, errBinLogPutType
-	}
-
-	keyLen := int(binary.BigEndian.Uint16(sz[1:]))
-	if 3+keyLen > len(sz) {
-		return nil, nil, errBinLogPutType
-	}
-
-	return sz[3 : 3+keyLen], sz[3+keyLen:], nil
-}
-
-func FormatBinLogEvent(event []byte) (string, error) {
-	logType := uint8(event[0])
-
-	var err error
-	var k []byte
-	var v []byte
-
-	var buf []byte = make([]byte, 0, 1024)
-
-	switch logType {
-	case BinLogTypePut:
-		k, v, err = decodeBinLogPut(event)
-		buf = append(buf, "PUT "...)
-	case BinLogTypeDeletion:
-		k, err = decodeBinLogDelete(event)
-		buf = append(buf, "DELETE "...)
-	default:
-		err = errInvalidBinLogEvent
-	}
-
-	if err != nil {
-		return "", err
-	}
-
-	if buf, err = formatDataKey(buf, k); err != nil {
-		return "", err
-	}
-
-	if v != nil && len(v) != 0 {
-		buf = append(buf, fmt.Sprintf(" %q", v)...)
-	}
-
-	return String(buf), nil
-}
-
-func formatDataKey(buf []byte, k []byte) ([]byte, error) {
-	if len(k) < 2 {
-		return nil, errInvalidBinLogEvent
-	}
-
-	buf = append(buf, fmt.Sprintf("DB:%2d ", k[0])...)
-	buf = append(buf, fmt.Sprintf("%s ", TypeName[k[1]])...)
-
-	db := new(DB)
-	db.index = k[0]
-
-	//to do format at respective place
-
-	switch k[1] {
-	case KVType:
-		if key, err := db.decodeKVKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	case HashType:
-		if key, field, err := db.hDecodeHashKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendQuote(buf, String(field))
-		}
-	case HSizeType:
-		if key, err := db.hDecodeSizeKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	case ListType:
-		if key, seq, err := db.lDecodeListKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendInt(buf, int64(seq), 10)
-		}
-	case LMetaType:
-		if key, err := db.lDecodeMetaKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	case ZSetType:
-		if key, m, err := db.zDecodeSetKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendQuote(buf, String(m))
-		}
-	case ZSizeType:
-		if key, err := db.zDecodeSizeKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	case ZScoreType:
-		if key, m, score, err := db.zDecodeScoreKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendQuote(buf, String(m))
-			buf = append(buf, ' ')
-			buf = strconv.AppendInt(buf, score, 10)
-		}
-	case BitType:
-		if key, seq, err := db.bDecodeBinKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendUint(buf, uint64(seq), 10)
-		}
-	case BitMetaType:
-		if key, err := db.bDecodeMetaKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	case SetType:
-		if key, member, err := db.sDecodeSetKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendQuote(buf, String(member))
-		}
-	case SSizeType:
-		if key, err := db.sDecodeSizeKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	case ExpTimeType:
-		if tp, key, t, err := db.expDecodeTimeKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = append(buf, TypeName[tp]...)
-			buf = append(buf, ' ')
-			buf = strconv.AppendQuote(buf, String(key))
-			buf = append(buf, ' ')
-			buf = strconv.AppendInt(buf, t, 10)
-		}
-	case ExpMetaType:
-		if tp, key, err := db.expDecodeMetaKey(k); err != nil {
-			return nil, err
-		} else {
-			buf = append(buf, TypeName[tp]...)
-			buf = append(buf, ' ')
-			buf = strconv.AppendQuote(buf, String(key))
-		}
-	default:
-		return nil, errInvalidBinLogEvent
-	}
-
-	return buf, nil
-}

ledis/const.go

@@ -23,6 +23,8 @@ const (
 
 	ExpTimeType byte = 101
 	ExpMetaType byte = 102
+
+	MetaType byte = 201
 )
 
 var (
@@ -44,6 +46,11 @@ var (
 	}
 )
 
+const (
+	RDWRMode  = 0
+	ROnlyMode = 1
+)
+
 const (
 	defaultScanCount int = 10
 )
@@ -79,12 +86,9 @@ const (
 
 var (
 	ErrScoreMiss     = errors.New("zset score miss")
-)
+	ErrWriteInROnly  = errors.New("write not support in readonly mode")
-
+	ErrRplInRDWR     = errors.New("replication not support in read write mode")
-const (
+	ErrRplNotSupport = errors.New("replication not support")
-	BinLogTypeDeletion uint8 = 0x0
-	BinLogTypePut      uint8 = 0x1
-	BinLogTypeCommand  uint8 = 0x2
 )
 
 const (

ledis/doc.go

@@ -2,7 +2,7 @@
 //
 // Ledis supports various data structure like kv, list, hash and zset like redis.
 //
-// Other features include binlog replication, data with a limited time-to-live.
+// Other features include replication, data with a limited time-to-live.
 //
 // Usage
 //
@@ -54,8 +54,5 @@
 //  n, err := db.ZAdd(key, ScorePair{score1, member1}, ScorePair{score2, member2})
 //  ay, err := db.ZRangeByScore(key, minScore, maxScore, 0, -1)
 //
-// Binlog
-//
-// ledis supports binlog, so you can sync binlog to another server for replication. If you want to open binlog support, set UseBinLog to true in config.
 //
 package ledis

ledis/dump.go

@@ -4,41 +4,26 @@ import (
 	"bufio"
 	"bytes"
 	"encoding/binary"
-	"github.com/siddontang/go-snappy/snappy"
+	"github.com/siddontang/go/snappy"
+	"github.com/siddontang/ledisdb/store"
 	"io"
 	"os"
 )
 
-//dump format
+type DumpHead struct {
-// fileIndex(bigendian int64)|filePos(bigendian int64)
+	CommitID uint64
-// |keylen(bigendian int32)|key|valuelen(bigendian int32)|value......
-//
-//key and value are both compressed for fast transfer dump on network using snappy
-
-type BinLogAnchor struct {
-	LogFileIndex int64
-	LogPos       int64
 }
 
-func (m *BinLogAnchor) WriteTo(w io.Writer) error {
+func (h *DumpHead) Read(r io.Reader) error {
-	if err := binary.Write(w, binary.BigEndian, m.LogFileIndex); err != nil {
+	if err := binary.Read(r, binary.BigEndian, &h.CommitID); err != nil {
 		return err
 	}
 
-	if err := binary.Write(w, binary.BigEndian, m.LogPos); err != nil {
-		return err
-	}
 	return nil
 }
 
-func (m *BinLogAnchor) ReadFrom(r io.Reader) error {
+func (h *DumpHead) Write(w io.Writer) error {
-	err := binary.Read(r, binary.BigEndian, &m.LogFileIndex)
+	if err := binary.Write(w, binary.BigEndian, h.CommitID); err != nil {
-	if err != nil {
-		return err
-	}
-
-	err = binary.Read(r, binary.BigEndian, &m.LogPos)
-	if err != nil {
 		return err
 	}
 
@@ -56,24 +41,35 @@ func (l *Ledis) DumpFile(path string) error {
 }
 
 func (l *Ledis) Dump(w io.Writer) error {
-	m := new(BinLogAnchor)
-
 	var err error
 
+	var commitID uint64
+	var snap *store.Snapshot
+
+	{
 		l.wLock.Lock()
 		defer l.wLock.Unlock()
 
-	if l.binlog != nil {
+		if l.r != nil {
-		m.LogFileIndex = l.binlog.LogFileIndex()
+			if commitID, err = l.r.LastCommitID(); err != nil {
-		m.LogPos = l.binlog.LogFilePos()
+				return err
+			}
+		}
+
+		if snap, err = l.ldb.NewSnapshot(); err != nil {
+			return err
+		}
 	}
 
 	wb := bufio.NewWriterSize(w, 4096)
-	if err = m.WriteTo(wb); err != nil {
+
+	h := &DumpHead{commitID}
+
+	if err = h.Write(wb); err != nil {
 		return err
 	}
 
-	it := l.ldb.NewIterator()
+	it := snap.NewIterator()
 	it.SeekToFirst()
 
 	compressBuf := make([]byte, 4096)
@@ -118,7 +114,8 @@ func (l *Ledis) Dump(w io.Writer) error {
 	return nil
 }
 
-func (l *Ledis) LoadDumpFile(path string) (*BinLogAnchor, error) {
+// clear all data and load dump file to db
+func (l *Ledis) LoadDumpFile(path string) (*DumpHead, error) {
 	f, err := os.Open(path)
 	if err != nil {
 		return nil, err
@@ -128,16 +125,21 @@ func (l *Ledis) LoadDumpFile(path string) (*BinLogAnchor, error) {
 	return l.LoadDump(f)
 }
 
-func (l *Ledis) LoadDump(r io.Reader) (*BinLogAnchor, error) {
+// clear all data and load dump file to db
+func (l *Ledis) LoadDump(r io.Reader) (*DumpHead, error) {
 	l.wLock.Lock()
 	defer l.wLock.Unlock()
 
-	info := new(BinLogAnchor)
+	var err error
+	if err = l.flushAll(); err != nil {
+		return nil, err
+	}
 
 	rb := bufio.NewReaderSize(r, 4096)
 
-	err := info.ReadFrom(rb)
+	h := new(DumpHead)
-	if err != nil {
+
+	if err = h.Read(rb); err != nil {
 		return nil, err
 	}
 
@@ -190,10 +192,11 @@ func (l *Ledis) LoadDump(r io.Reader) (*BinLogAnchor, error) {
 	deKeyBuf = nil
 	deValueBuf = nil
 
-	//if binlog enable, we will delete all binlogs and open a new one for handling simply
+	if l.r != nil {
-	if l.binlog != nil {
+		if err := l.r.UpdateCommitID(h.CommitID); err != nil {
-		l.binlog.PurgeAll()
+			return nil, err
+		}
 	}
 
-	return info, nil
+	return h, nil
 }

ledis/event.go

@@ -0,0 +1,223 @@
+package ledis
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"github.com/siddontang/go/hack"
+	"io"
+	"strconv"
+)
+
+const (
+	kTypeDeleteEvent uint8 = 0
+	kTypePutEvent    uint8 = 1
+)
+
+var (
+	errInvalidPutEvent    = errors.New("invalid put event")
+	errInvalidDeleteEvent = errors.New("invalid delete event")
+	errInvalidEvent       = errors.New("invalid event")
+)
+
+type eventBatch struct {
+	bytes.Buffer
+}
+
+func (b *eventBatch) Put(key []byte, value []byte) {
+	l := uint32(len(key) + len(value) + 1 + 2)
+	binary.Write(b, binary.BigEndian, l)
+	b.WriteByte(kTypePutEvent)
+	keyLen := uint16(len(key))
+	binary.Write(b, binary.BigEndian, keyLen)
+	b.Write(key)
+	b.Write(value)
+}
+
+func (b *eventBatch) Delete(key []byte) {
+	l := uint32(len(key) + 1)
+	binary.Write(b, binary.BigEndian, l)
+	b.WriteByte(kTypeDeleteEvent)
+	b.Write(key)
+}
+
+type eventWriter interface {
+	Put(key []byte, value []byte)
+	Delete(key []byte)
+}
+
+func decodeEventBatch(w eventWriter, data []byte) error {
+	for {
+		if len(data) == 0 {
+			return nil
+		}
+
+		if len(data) < 4 {
+			return io.ErrUnexpectedEOF
+		}
+
+		l := binary.BigEndian.Uint32(data)
+		data = data[4:]
+		if uint32(len(data)) < l {
+			return io.ErrUnexpectedEOF
+		}
+
+		if err := decodeEvent(w, data[0:l]); err != nil {
+			return err
+		}
+		data = data[l:]
+	}
+}
+
+func decodeEvent(w eventWriter, b []byte) error {
+	if len(b) == 0 {
+		return errInvalidEvent
+	}
+
+	switch b[0] {
+	case kTypePutEvent:
+		if len(b[1:]) < 2 {
+			return errInvalidPutEvent
+		}
+
+		keyLen := binary.BigEndian.Uint16(b[1:3])
+		b = b[3:]
+		if len(b) < int(keyLen) {
+			return errInvalidPutEvent
+		}
+
+		w.Put(b[0:keyLen], b[keyLen:])
+	case kTypeDeleteEvent:
+		w.Delete(b[1:])
+	default:
+		return errInvalidEvent
+	}
+
+	return nil
+}
+
+func formatEventKey(buf []byte, k []byte) ([]byte, error) {
+	if len(k) < 2 {
+		return nil, errInvalidEvent
+	}
+
+	buf = append(buf, fmt.Sprintf("DB:%2d ", k[0])...)
+	buf = append(buf, fmt.Sprintf("%s ", TypeName[k[1]])...)
+
+	db := new(DB)
+	db.index = k[0]
+
+	//to do format at respective place
+
+	switch k[1] {
+	case KVType:
+		if key, err := db.decodeKVKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	case HashType:
+		if key, field, err := db.hDecodeHashKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendQuote(buf, hack.String(field))
+		}
+	case HSizeType:
+		if key, err := db.hDecodeSizeKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	case ListType:
+		if key, seq, err := db.lDecodeListKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendInt(buf, int64(seq), 10)
+		}
+	case LMetaType:
+		if key, err := db.lDecodeMetaKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	case ZSetType:
+		if key, m, err := db.zDecodeSetKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendQuote(buf, hack.String(m))
+		}
+	case ZSizeType:
+		if key, err := db.zDecodeSizeKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	case ZScoreType:
+		if key, m, score, err := db.zDecodeScoreKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendQuote(buf, hack.String(m))
+			buf = append(buf, ' ')
+			buf = strconv.AppendInt(buf, score, 10)
+		}
+	case BitType:
+		if key, seq, err := db.bDecodeBinKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendUint(buf, uint64(seq), 10)
+		}
+	case BitMetaType:
+		if key, err := db.bDecodeMetaKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	case SetType:
+		if key, member, err := db.sDecodeSetKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendQuote(buf, hack.String(member))
+		}
+	case SSizeType:
+		if key, err := db.sDecodeSizeKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	case ExpTimeType:
+		if tp, key, t, err := db.expDecodeTimeKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = append(buf, TypeName[tp]...)
+			buf = append(buf, ' ')
+			buf = strconv.AppendQuote(buf, hack.String(key))
+			buf = append(buf, ' ')
+			buf = strconv.AppendInt(buf, t, 10)
+		}
+	case ExpMetaType:
+		if tp, key, err := db.expDecodeMetaKey(k); err != nil {
+			return nil, err
+		} else {
+			buf = append(buf, TypeName[tp]...)
+			buf = append(buf, ' ')
+			buf = strconv.AppendQuote(buf, hack.String(key))
+		}
+	default:
+		return nil, errInvalidEvent
+	}
+
+	return buf, nil
+}

ledis/event_test.go

@@ -0,0 +1,56 @@
+package ledis
+
+import (
+	"reflect"
+	"testing"
+)
+
+type testEvent struct {
+	Key   []byte
+	Value []byte
+}
+
+type testEventWriter struct {
+	evs []testEvent
+}
+
+func (w *testEventWriter) Put(key []byte, value []byte) {
+	e := testEvent{key, value}
+	w.evs = append(w.evs, e)
+}
+
+func (w *testEventWriter) Delete(key []byte) {
+	e := testEvent{key, nil}
+	w.evs = append(w.evs, e)
+}
+
+func TestEvent(t *testing.T) {
+	k1 := []byte("k1")
+	v1 := []byte("v1")
+	k2 := []byte("k2")
+	k3 := []byte("k3")
+	v3 := []byte("v3")
+
+	b := new(eventBatch)
+
+	b.Put(k1, v1)
+	b.Delete(k2)
+	b.Put(k3, v3)
+
+	buf := b.Bytes()
+
+	w := &testEventWriter{}
+
+	ev2 := &testEventWriter{
+		evs: []testEvent{
+			testEvent{k1, v1},
+			testEvent{k2, nil},
+			testEvent{k3, v3}},
+	}
+
+	if err := decodeEventBatch(w, buf); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(w, ev2) {
+		t.Fatal("not equal")
+	}
+}

ledis/ledis.go

@@ -2,9 +2,14 @@ package ledis
 
 import (
 	"fmt"
-	"github.com/siddontang/go-log/log"
+	"github.com/siddontang/go/filelock"
+	"github.com/siddontang/go/log"
 	"github.com/siddontang/ledisdb/config"
+	"github.com/siddontang/ledisdb/rpl"
 	"github.com/siddontang/ledisdb/store"
+	"io"
+	"os"
+	"path"
 	"sync"
 	"time"
 )
@@ -16,59 +21,93 @@ type Ledis struct {
 	dbs [MaxDBNumber]*DB
 
 	quit chan struct{}
-	jobs *sync.WaitGroup
+	wg   sync.WaitGroup
 
-	binlog *BinLog
+	//for replication
+	r      *rpl.Replication
+	rc     chan struct{}
+	rbatch store.WriteBatch
+	rwg    sync.WaitGroup
+	rhs    []NewLogEventHandler
 
 	wLock      sync.RWMutex //allow one write at same time
 	commitLock sync.Mutex   //allow one write commit at same time
+
+	// for readonly mode, only replication and flushall can write
+	readOnly bool
+
+	lock io.Closer
 }
 
 func Open(cfg *config.Config) (*Ledis, error) {
+	return Open2(cfg, RDWRMode)
+}
+
+func Open2(cfg *config.Config, flags int) (*Ledis, error) {
 	if len(cfg.DataDir) == 0 {
 		cfg.DataDir = config.DefaultDataDir
 	}
 
-	ldb, err := store.Open(cfg)
+	os.MkdirAll(cfg.DataDir, 0755)
-	if err != nil {
+
-		return nil, err
+	var err error
-	}
 
 	l := new(Ledis)
 
-	l.quit = make(chan struct{})
+	if l.lock, err = filelock.Lock(path.Join(cfg.DataDir, "LOCK")); err != nil {
-	l.jobs = new(sync.WaitGroup)
-
-	l.ldb = ldb
-
-	if cfg.BinLog.MaxFileNum > 0 && cfg.BinLog.MaxFileSize > 0 {
-		println("binlog will be refactored later, use your own risk!!!")
-		l.binlog, err = NewBinLog(cfg)
-		if err != nil {
 		return nil, err
 	}
+
+	l.readOnly = (flags&ROnlyMode > 0)
+
+	l.quit = make(chan struct{})
+
+	if l.ldb, err = store.Open(cfg); err != nil {
+		return nil, err
+	}
+
+	if cfg.UseReplication {
+		if l.r, err = rpl.NewReplication(cfg); err != nil {
+			return nil, err
+		}
+
+		l.rc = make(chan struct{}, 1)
+		l.rbatch = l.ldb.NewWriteBatch()
+
+		l.wg.Add(1)
+		go l.onReplication()
+
+		//first we must try wait all replication ok
+		//maybe some logs are not committed
+		l.WaitReplication()
 	} else {
-		l.binlog = nil
+		l.r = nil
 	}
 
 	for i := uint8(0); i < MaxDBNumber; i++ {
 		l.dbs[i] = l.newDB(i)
 	}
 
-	l.activeExpireCycle()
+	l.wg.Add(1)
+	go l.onDataExpired()
 
 	return l, nil
 }
 
 func (l *Ledis) Close() {
 	close(l.quit)
-	l.jobs.Wait()
+	l.wg.Wait()
 
 	l.ldb.Close()
 
-	if l.binlog != nil {
+	if l.r != nil {
-		l.binlog.Close()
+		l.r.Close()
-		l.binlog = nil
+		l.r = nil
+	}
+
+	if l.lock != nil {
+		l.lock.Close()
+		l.lock = nil
 	}
 }
 
@@ -80,35 +119,84 @@ func (l *Ledis) Select(index int) (*DB, error) {
 	return l.dbs[index], nil
 }
 
+// Flush All will clear all data and replication logs
 func (l *Ledis) FlushAll() error {
-	for index, db := range l.dbs {
+	l.wLock.Lock()
-		if _, err := db.FlushAll(); err != nil {
+	defer l.wLock.Unlock()
-			log.Error("flush db %d error %s", index, err.Error())
+
+	return l.flushAll()
+}
+
+func (l *Ledis) flushAll() error {
+	it := l.ldb.NewIterator()
+	defer it.Close()
+
+	w := l.ldb.NewWriteBatch()
+	defer w.Rollback()
+
+	n := 0
+	for ; it.Valid(); it.Next() {
+		n++
+		if n == 10000 {
+			if err := w.Commit(); err != nil {
+				log.Fatal("flush all commit error: %s", err.Error())
+				return err
+			}
+			n = 0
+		}
+		w.Delete(it.RawKey())
+	}
+
+	if err := w.Commit(); err != nil {
+		log.Fatal("flush all commit error: %s", err.Error())
+		return err
+	}
+
+	if l.r != nil {
+		if err := l.r.Clear(); err != nil {
+			log.Fatal("flush all replication clear error: %s", err.Error())
+			return err
 		}
 	}
 
 	return nil
 }
 
-// very dangerous to use
+func (l *Ledis) IsReadOnly() bool {
-func (l *Ledis) DataDB() *store.DB {
+	if l.readOnly {
-	return l.ldb
+		return true
+	} else if l.r != nil {
+		if b, _ := l.r.CommitIDBehind(); b {
+			return true
+		}
+	}
+	return false
 }
 
-func (l *Ledis) activeExpireCycle() {
+func (l *Ledis) SetReadOnly(b bool) {
+	l.readOnly = b
+}
+
+func (l *Ledis) onDataExpired() {
+	defer l.wg.Done()
+
 	var executors []*elimination = make([]*elimination, len(l.dbs))
 	for i, db := range l.dbs {
 		executors[i] = db.newEliminator()
 	}
 
-	l.jobs.Add(1)
-	go func() {
 	tick := time.NewTicker(1 * time.Second)
-		end := false
+	defer tick.Stop()
+
 	done := make(chan struct{})
-		for !end {
+
+	for {
 		select {
 		case <-tick.C:
+			if l.IsReadOnly() {
+				break
+			}
+
 			go func() {
 				for _, eli := range executors {
 					eli.active()
@@ -117,12 +205,8 @@ func (l *Ledis) activeExpireCycle() {
 			}()
 			<-done
 		case <-l.quit:
-				end = true
+			return
-				break
 		}
 	}
 
-		tick.Stop()
-		l.jobs.Done()
-	}()
 }

ledis/ledis_db.go

@@ -109,21 +109,6 @@ func (db *DB) newEliminator() *elimination {
 	return eliminator
 }
 
-func (db *DB) flushRegion(t *batch, minKey []byte, maxKey []byte) (drop int64, err error) {
-	it := db.bucket.RangeIterator(minKey, maxKey, store.RangeROpen)
-	for ; it.Valid(); it.Next() {
-		t.Delete(it.RawKey())
-		drop++
-		if drop&1023 == 0 {
-			if err = t.Commit(); err != nil {
-				return
-			}
-		}
-	}
-	it.Close()
-	return
-}
-
 func (db *DB) flushType(t *batch, dataType byte) (drop int64, err error) {
 	var deleteFunc func(t *batch, key []byte) int64
 	var metaDataType byte

ledis/ledis_test.go

@@ -14,8 +14,6 @@ func getTestDB() *DB {
 	f := func() {
 		cfg := new(config.Config)
 		cfg.DataDir = "/tmp/test_ledis"
-		// cfg.BinLog.MaxFileSize = 1073741824
-		// cfg.BinLog.MaxFileNum = 3
 
 		os.RemoveAll(cfg.DataDir)
 

ledis/replication.go

@@ -1,114 +1,123 @@
 package ledis
 
 import (
-	"bufio"
 	"bytes"
 	"errors"
-	"github.com/siddontang/go-log/log"
+	"github.com/siddontang/go/log"
-	"github.com/siddontang/ledisdb/store/driver"
+	"github.com/siddontang/go/snappy"
+	"github.com/siddontang/ledisdb/rpl"
 	"io"
-	"os"
 	"time"
 )
 
 const (
-	maxReplBatchNum = 100
 	maxReplLogSize = 1 * 1024 * 1024
 )
 
 var (
-	ErrSkipEvent = errors.New("skip to next event")
+	ErrLogMissed = errors.New("log is pured in server")
 )
 
-var (
+func (l *Ledis) ReplicationUsed() bool {
-	errInvalidBinLogEvent = errors.New("invalid binglog event")
+	return l.r != nil
-	errInvalidBinLogFile  = errors.New("invalid binlog file")
-)
-
-type replBatch struct {
-	wb     driver.IWriteBatch
-	events [][]byte
-	l      *Ledis
-
-	lastHead *BinLogHead
 }
 
-func (b *replBatch) Commit() error {
+func (l *Ledis) handleReplication() error {
-	b.l.commitLock.Lock()
+	l.wLock.Lock()
-	defer b.l.commitLock.Unlock()
+	defer l.wLock.Unlock()
 
-	err := b.wb.Commit()
+	l.rwg.Add(1)
-	if err != nil {
+	rl := &rpl.Log{}
-		b.Rollback()
-		return err
-	}
-
-	if b.l.binlog != nil {
-		if err = b.l.binlog.Log(b.events...); err != nil {
-			b.Rollback()
-			return err
-		}
-	}
-
-	b.events = [][]byte{}
-	b.lastHead = nil
-
-	return nil
-}
-
-func (b *replBatch) Rollback() error {
-	b.wb.Rollback()
-	b.events = [][]byte{}
-	b.lastHead = nil
-	return nil
-}
-
-func (l *Ledis) replicateEvent(b *replBatch, event []byte) error {
-	if len(event) == 0 {
-		return errInvalidBinLogEvent
-	}
-
-	b.events = append(b.events, event)
-
-	logType := uint8(event[0])
-	switch logType {
-	case BinLogTypePut:
-		return l.replicatePutEvent(b, event)
-	case BinLogTypeDeletion:
-		return l.replicateDeleteEvent(b, event)
-	default:
-		return errInvalidBinLogEvent
-	}
-}
-
-func (l *Ledis) replicatePutEvent(b *replBatch, event []byte) error {
-	key, value, err := decodeBinLogPut(event)
-	if err != nil {
-		return err
-	}
-
-	b.wb.Put(key, value)
-
-	return nil
-}
-
-func (l *Ledis) replicateDeleteEvent(b *replBatch, event []byte) error {
-	key, err := decodeBinLogDelete(event)
-	if err != nil {
-		return err
-	}
-
-	b.wb.Delete(key)
-
-	return nil
-}
-
-func ReadEventFromReader(rb io.Reader, f func(head *BinLogHead, event []byte) error) error {
-	head := &BinLogHead{}
 	var err error
+	for {
+		if err = l.r.NextNeedCommitLog(rl); err != nil {
+			if err != rpl.ErrNoBehindLog {
+				log.Error("get next commit log err, %s", err.Error)
+				return err
+			} else {
+				l.rwg.Done()
+				return nil
+			}
+		} else {
+			l.rbatch.Rollback()
+
+			if rl.Compression == 1 {
+				//todo optimize
+				if rl.Data, err = snappy.Decode(nil, rl.Data); err != nil {
+					log.Error("decode log error %s", err.Error())
+					return err
+				}
+			}
+
+			decodeEventBatch(l.rbatch, rl.Data)
+
+			l.commitLock.Lock()
+			if err = l.rbatch.Commit(); err != nil {
+				log.Error("commit log error %s", err.Error())
+			} else if err = l.r.UpdateCommitID(rl.ID); err != nil {
+				log.Error("update commit id error %s", err.Error())
+			}
+
+			l.commitLock.Unlock()
+			if err != nil {
+				return err
+			}
+		}
+
+	}
+}
+
+func (l *Ledis) onReplication() {
+	defer l.wg.Done()
+
+	l.noticeReplication()
 
 	for {
-		if err = head.Read(rb); err != nil {
+		select {
+		case <-l.rc:
+			l.handleReplication()
+		case <-l.quit:
+			return
+		}
+	}
+}
+
+func (l *Ledis) WaitReplication() error {
+	if !l.ReplicationUsed() {
+		return ErrRplNotSupport
+
+	}
+
+	l.noticeReplication()
+	l.rwg.Wait()
+
+	for i := 0; i < 100; i++ {
+		b, err := l.r.CommitIDBehind()
+		if err != nil {
+			return err
+		} else if b {
+			l.noticeReplication()
+			l.rwg.Wait()
+			time.Sleep(100 * time.Millisecond)
+		} else {
+			return nil
+		}
+	}
+
+	return errors.New("wait replication too many times")
+}
+
+func (l *Ledis) StoreLogsFromReader(rb io.Reader) error {
+	if !l.ReplicationUsed() {
+		return ErrRplNotSupport
+	} else if !l.readOnly {
+		return ErrRplInRDWR
+	}
+
+	log := &rpl.Log{}
+
+	for {
+		if err := log.Decode(rb); err != nil {
 			if err == io.EOF {
 				break
 			} else {
@@ -116,196 +125,114 @@ func ReadEventFromReader(rb io.Reader, f func(head *BinLogHead, event []byte) er
 			}
 		}
 
-		var dataBuf bytes.Buffer
+		if err := l.r.StoreLog(log); err != nil {
-
-		if _, err = io.CopyN(&dataBuf, rb, int64(head.PayloadLen)); err != nil {
 			return err
 		}
 
-		err = f(head, dataBuf.Bytes())
-		if err != nil && err != ErrSkipEvent {
-			return err
-		}
 	}
 
+	l.noticeReplication()
+
 	return nil
 }
 
-func (l *Ledis) ReplicateFromReader(rb io.Reader) error {
+func (l *Ledis) noticeReplication() {
-	b := new(replBatch)
+	AsyncNotify(l.rc)
-
-	b.wb = l.ldb.NewWriteBatch()
-	b.l = l
-
-	f := func(head *BinLogHead, event []byte) error {
-		if b.lastHead == nil {
-			b.lastHead = head
-		} else if !b.lastHead.InSameBatch(head) {
-			if err := b.Commit(); err != nil {
-				log.Fatal("replication error %s, skip to next", err.Error())
-				return ErrSkipEvent
-			}
-			b.lastHead = head
-		}
-
-		err := l.replicateEvent(b, event)
-		if err != nil {
-			log.Fatal("replication error %s, skip to next", err.Error())
-			return ErrSkipEvent
-		}
-		return nil
-	}
-
-	err := ReadEventFromReader(rb, f)
-	if err != nil {
-		b.Rollback()
-		return err
-	}
-	return b.Commit()
 }
 
-func (l *Ledis) ReplicateFromData(data []byte) error {
+func (l *Ledis) StoreLogsFromData(data []byte) error {
 	rb := bytes.NewReader(data)
 
-	err := l.ReplicateFromReader(rb)
+	return l.StoreLogsFromReader(rb)
-
-	return err
 }
 
-func (l *Ledis) ReplicateFromBinLog(filePath string) error {
+func (l *Ledis) ReadLogsTo(startLogID uint64, w io.Writer) (n int, nextLogID uint64, err error) {
-	f, err := os.Open(filePath)
+	if !l.ReplicationUsed() {
-	if err != nil {
+		// no replication log
-		return err
+		nextLogID = 0
+		err = ErrRplNotSupport
+		return
 	}
 
-	rb := bufio.NewReaderSize(f, 4096)
+	var firtID, lastID uint64
 
-	err = l.ReplicateFromReader(rb)
+	firtID, err = l.r.FirstLogID()
+	if err != nil {
+		return
+	}
 
-	f.Close()
+	if startLogID < firtID {
+		err = ErrLogMissed
+		return
+	}
 
-	return err
+	lastID, err = l.r.LastLogID()
+	if err != nil {
+		return
+	}
+
+	nextLogID = startLogID
+
+	log := &rpl.Log{}
+	for i := startLogID; i <= lastID; i++ {
+		if err = l.r.GetLog(i, log); err != nil {
+			return
+		}
+
+		if err = log.Encode(w); err != nil {
+			return
+		}
+
+		nextLogID = i + 1
+
+		n += log.Size()
+
+		if n > maxReplLogSize {
+			break
+		}
+	}
+
+	return
 }
 
 // try to read events, if no events read, try to wait the new event singal until timeout seconds
-func (l *Ledis) ReadEventsToTimeout(info *BinLogAnchor, w io.Writer, timeout int) (n int, err error) {
+func (l *Ledis) ReadLogsToTimeout(startLogID uint64, w io.Writer, timeout int) (n int, nextLogID uint64, err error) {
-	lastIndex := info.LogFileIndex
+	n, nextLogID, err = l.ReadLogsTo(startLogID, w)
-	lastPos := info.LogPos
+	if err != nil {
-
+		return
-	n = 0
+	} else if n != 0 {
-	if l.binlog == nil {
-		//binlog not supported
-		info.LogFileIndex = 0
-		info.LogPos = 0
 		return
 	}
-
-	n, err = l.ReadEventsTo(info, w)
-	if err == nil && info.LogFileIndex == lastIndex && info.LogPos == lastPos {
 	//no events read
 	select {
-		case <-l.binlog.Wait():
+	case <-l.r.WaitLog():
 	case <-time.After(time.Duration(timeout) * time.Second):
 	}
-		return l.ReadEventsTo(info, w)
+	return l.ReadLogsTo(startLogID, w)
-	}
-	return
 }
 
-func (l *Ledis) ReadEventsTo(info *BinLogAnchor, w io.Writer) (n int, err error) {
+func (l *Ledis) propagate(rl *rpl.Log) {
-	n = 0
+	for _, h := range l.rhs {
-	if l.binlog == nil {
+		h(rl)
-		//binlog not supported
-		info.LogFileIndex = 0
-		info.LogPos = 0
-		return
 	}
-
+}
-	index := info.LogFileIndex
+
-	offset := info.LogPos
+type NewLogEventHandler func(rl *rpl.Log)
-
+
-	filePath := l.binlog.FormatLogFilePath(index)
+func (l *Ledis) AddNewLogEventHandler(h NewLogEventHandler) error {
-
+	if !l.ReplicationUsed() {
-	var f *os.File
+		return ErrRplNotSupport
-	f, err = os.Open(filePath)
+	}
-	if os.IsNotExist(err) {
+
-		lastIndex := l.binlog.LogFileIndex()
+	l.rhs = append(l.rhs, h)
-
+
-		if index == lastIndex {
+	return nil
-			//no binlog at all
+}
-			info.LogPos = 0
+
-		} else {
+func (l *Ledis) ReplicationStat() (*rpl.Stat, error) {
-			//slave binlog info had lost
+	if !l.ReplicationUsed() {
-			info.LogFileIndex = -1
+		return nil, ErrRplNotSupport
-		}
+	}
-	}
+
-
+	return l.r.Stat()
-	if err != nil {
-		if os.IsNotExist(err) {
-			err = nil
-		}
-		return
-	}
-
-	defer f.Close()
-
-	var fileSize int64
-	st, _ := f.Stat()
-	fileSize = st.Size()
-
-	if fileSize == info.LogPos {
-		return
-	}
-
-	if _, err = f.Seek(offset, os.SEEK_SET); err != nil {
-		//may be invliad seek offset
-		return
-	}
-
-	var lastHead *BinLogHead = nil
-
-	head := &BinLogHead{}
-
-	batchNum := 0
-
-	for {
-		if err = head.Read(f); err != nil {
-			if err == io.EOF {
-				//we will try to use next binlog
-				if index < l.binlog.LogFileIndex() {
-					info.LogFileIndex += 1
-					info.LogPos = 0
-				}
-				err = nil
-				return
-			} else {
-				return
-			}
-
-		}
-
-		if lastHead == nil {
-			lastHead = head
-			batchNum++
-		} else if !lastHead.InSameBatch(head) {
-			lastHead = head
-			batchNum++
-			if batchNum > maxReplBatchNum || n > maxReplLogSize {
-				return
-			}
-		}
-
-		if err = head.Write(w); err != nil {
-			return
-		}
-
-		if _, err = io.CopyN(w, f, int64(head.PayloadLen)); err != nil {
-			return
-		}
-
-		n += (head.Len() + int(head.PayloadLen))
-		info.LogPos = info.LogPos + int64(head.Len()) + int64(head.PayloadLen)
-	}
-
-	return
 }

ledis/replication_test.go

@@ -6,7 +6,6 @@ import (
 	"github.com/siddontang/ledisdb/config"
 	"github.com/siddontang/ledisdb/store"
 	"os"
-	"path"
 	"testing"
 )
 
@@ -34,8 +33,8 @@ func TestReplication(t *testing.T) {
 	cfgM := new(config.Config)
 	cfgM.DataDir = "/tmp/test_repl/master"
 
-	cfgM.BinLog.MaxFileNum = 10
+	cfgM.UseReplication = true
-	cfgM.BinLog.MaxFileSize = 50
+	cfgM.Replication.Compression = true
 
 	os.RemoveAll(cfgM.DataDir)
 
@@ -46,10 +45,11 @@ func TestReplication(t *testing.T) {
 
 	cfgS := new(config.Config)
 	cfgS.DataDir = "/tmp/test_repl/slave"
+	cfgS.UseReplication = true
 
 	os.RemoveAll(cfgS.DataDir)
 
-	slave, err = Open(cfgS)
+	slave, err = Open2(cfgS, ROnlyMode)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -59,16 +59,9 @@ func TestReplication(t *testing.T) {
 	db.Set([]byte("b"), []byte("value"))
 	db.Set([]byte("c"), []byte("value"))
 
-	if tx, err := db.Begin(); err == nil {
-		tx.HSet([]byte("a"), []byte("1"), []byte("value"))
-		tx.HSet([]byte("b"), []byte("2"), []byte("value"))
-		tx.HSet([]byte("c"), []byte("3"), []byte("value"))
-		tx.Commit()
-	} else {
 	db.HSet([]byte("a"), []byte("1"), []byte("value"))
 	db.HSet([]byte("b"), []byte("2"), []byte("value"))
 	db.HSet([]byte("c"), []byte("3"), []byte("value"))
-	}
 
 	m, _ := db.Multi()
 	m.Set([]byte("a1"), []byte("value"))
@@ -76,19 +69,6 @@ func TestReplication(t *testing.T) {
 	m.Set([]byte("c1"), []byte("value"))
 	m.Close()
 
-	for _, name := range master.binlog.LogNames() {
-		p := path.Join(master.binlog.LogPath(), name)
-
-		err = slave.ReplicateFromBinLog(p)
-		if err != nil {
-			t.Fatal(err)
-		}
-	}
-
-	if err = checkLedisEqual(master, slave); err != nil {
-		t.Fatal(err)
-	}
-
 	slave.FlushAll()
 
 	db.Set([]byte("a1"), []byte("value"))
@@ -99,37 +79,24 @@ func TestReplication(t *testing.T) {
 	db.HSet([]byte("b1"), []byte("2"), []byte("value"))
 	db.HSet([]byte("c1"), []byte("3"), []byte("value"))
 
-	if tx, err := db.Begin(); err == nil {
-		tx.HSet([]byte("a1"), []byte("1"), []byte("value1"))
-		tx.HSet([]byte("b1"), []byte("2"), []byte("value1"))
-		tx.HSet([]byte("c1"), []byte("3"), []byte("value1"))
-		tx.Rollback()
-	}
-
-	info := new(BinLogAnchor)
-	info.LogFileIndex = 1
-	info.LogPos = 0
 	var buf bytes.Buffer
 	var n int
-
+	var id uint64 = 1
 	for {
 		buf.Reset()
-		n, err = master.ReadEventsTo(info, &buf)
+		n, id, err = master.ReadLogsTo(id, &buf)
 		if err != nil {
 			t.Fatal(err)
-		} else if info.LogFileIndex == -1 {
+		} else if n != 0 {
-			t.Fatal("invalid log file index -1")
+			if err = slave.StoreLogsFromReader(&buf); err != nil {
-		} else if info.LogFileIndex == 0 {
-			t.Fatal("invalid log file index 0")
-		} else {
-			if err = slave.ReplicateFromReader(&buf); err != nil {
 				t.Fatal(err)
 			}
-			if n == 0 {
+		} else if n == 0 {
 			break
 		}
 	}
-	}
+
+	slave.WaitReplication()
 
 	if err = checkLedisEqual(master, slave); err != nil {
 		t.Fatal(err)

ledis/scan.go

@@ -24,17 +24,17 @@ func (db *DB) scan(dataType byte, key []byte, count int, inclusive bool, match s
 		if err = checkKeySize(key); err != nil {
 			return nil, err
 		}
-		if minKey, err = db.encodeMetaKey(dataType, key); err != nil {
+		if minKey, err = db.encodeScanKey(dataType, key); err != nil {
 			return nil, err
 		}
 
 	} else {
-		if minKey, err = db.encodeMinKey(dataType); err != nil {
+		if minKey, err = db.encodeScanMinKey(dataType); err != nil {
 			return nil, err
 		}
 	}
 
-	if maxKey, err = db.encodeMaxKey(dataType); err != nil {
+	if maxKey, err = db.encodeScanMaxKey(dataType); err != nil {
 		return nil, err
 	}
 
@@ -54,7 +54,7 @@ func (db *DB) scan(dataType byte, key []byte, count int, inclusive bool, match s
 	}
 
 	for i := 0; it.Valid() && i < count && bytes.Compare(it.RawKey(), maxKey) < 0; it.Next() {
-		if k, err := db.decodeMetaKey(dataType, it.Key()); err != nil {
+		if k, err := db.decodeScanKey(dataType, it.Key()); err != nil {
 			continue
 		} else if r != nil && !r.Match(k) {
 			continue
@@ -67,12 +67,12 @@ func (db *DB) scan(dataType byte, key []byte, count int, inclusive bool, match s
 	return v, nil
 }
 
-func (db *DB) encodeMinKey(dataType byte) ([]byte, error) {
+func (db *DB) encodeScanMinKey(dataType byte) ([]byte, error) {
-	return db.encodeMetaKey(dataType, nil)
+	return db.encodeScanKey(dataType, nil)
 }
 
-func (db *DB) encodeMaxKey(dataType byte) ([]byte, error) {
+func (db *DB) encodeScanMaxKey(dataType byte) ([]byte, error) {
-	k, err := db.encodeMetaKey(dataType, nil)
+	k, err := db.encodeScanKey(dataType, nil)
 	if err != nil {
 		return nil, err
 	}
@@ -80,7 +80,7 @@ func (db *DB) encodeMaxKey(dataType byte) ([]byte, error) {
 	return k, nil
 }
 
-func (db *DB) encodeMetaKey(dataType byte, key []byte) ([]byte, error) {
+func (db *DB) encodeScanKey(dataType byte, key []byte) ([]byte, error) {
 	switch dataType {
 	case KVType:
 		return db.encodeKVKey(key), nil
@@ -98,7 +98,7 @@ func (db *DB) encodeMetaKey(dataType byte, key []byte) ([]byte, error) {
 		return nil, errDataType
 	}
 }
-func (db *DB) decodeMetaKey(dataType byte, ek []byte) ([]byte, error) {
+func (db *DB) decodeScanKey(dataType byte, ek []byte) ([]byte, error) {
 	if len(ek) < 2 || ek[0] != db.index || ek[1] != dataType {
 		return nil, errMetaKey
 	}

ledis/t_bit.go

@@ -3,6 +3,7 @@ package ledis
 import (
 	"encoding/binary"
 	"errors"
+	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/store"
 	"sort"
 	"time"
@@ -239,8 +240,8 @@ func (db *DB) bUpdateMeta(t *batch, key []byte, seq uint32, off uint32) (tailSeq
 	} else if tseq < 0 {
 		update = true
 	} else {
-		tailSeq = uint32(MaxInt32(tseq, 0))
+		tailSeq = uint32(num.MaxInt32(tseq, 0))
-		tailOff = uint32(MaxInt32(toff, 0))
+		tailOff = uint32(num.MaxInt32(toff, 0))
 		update = (seq > tailSeq || (seq == tailSeq && off > tailOff))
 	}
 
@@ -461,7 +462,7 @@ func (db *DB) BGet(key []byte) (data []byte, err error) {
 		}
 
 		s = seq << segByteWidth
-		e = MinUInt32(s+segByteSize, capByteSize)
+		e = num.MinUint32(s+segByteSize, capByteSize)
 		copy(data[s:e], it.RawValue())
 	}
 	it.Close()

ledis/t_hash.go

@@ -3,6 +3,7 @@ package ledis
 import (
 	"encoding/binary"
 	"errors"
+	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/store"
 	"time"
 )
@@ -183,8 +184,6 @@ func (db *DB) HSet(key []byte, field []byte, value []byte) (int64, error) {
 		return 0, err
 	}
 
-	//todo add binlog
-
 	err = t.Commit()
 	return n, err
 }
@@ -334,7 +333,7 @@ func (db *DB) HIncrBy(key []byte, field []byte, delta int64) (int64, error) {
 
 	n += delta
 
-	_, err = db.hSetItem(key, field, StrPutInt64(n))
+	_, err = db.hSetItem(key, field, num.FormatInt64ToSlice(n))
 	if err != nil {
 		return 0, err
 	}

ledis/t_kv.go

@@ -2,6 +2,7 @@ package ledis
 
 import (
 	"errors"
+	"github.com/siddontang/go/num"
 	"time"
 )
 
@@ -75,9 +76,7 @@ func (db *DB) incr(key []byte, delta int64) (int64, error) {
 
 	n += delta
 
-	t.Put(key, StrPutInt64(n))
+	t.Put(key, num.FormatInt64ToSlice(n))
-
-	//todo binlog
 
 	err = t.Commit()
 	return n, err
@@ -185,7 +184,6 @@ func (db *DB) GetSet(key []byte, value []byte) ([]byte, error) {
 	}
 
 	t.Put(key, value)
-	//todo, binlog
 
 	err = t.Commit()
 
@@ -244,7 +242,6 @@ func (db *DB) MSet(args ...KVPair) error {
 
 		t.Put(key, value)
 
-		//todo binlog
 	}
 
 	err = t.Commit()
@@ -297,8 +294,6 @@ func (db *DB) SetNX(key []byte, value []byte) (int64, error) {
 	} else {
 		t.Put(key, value)
 
-		//todo binlog
-
 		err = t.Commit()
 	}
 

ledis/t_set.go

@@ -3,6 +3,7 @@ package ledis
 import (
 	"encoding/binary"
 	"errors"
+	"github.com/siddontang/go/hack"
 	"github.com/siddontang/ledisdb/store"
 	"time"
 )
@@ -240,7 +241,7 @@ func (db *DB) sDiffGeneric(keys ...[]byte) ([][]byte, error) {
 	}
 
 	for _, m := range members {
-		destMap[String(m)] = true
+		destMap[hack.String(m)] = true
 	}
 
 	for _, k := range keys[1:] {
@@ -250,10 +251,10 @@ func (db *DB) sDiffGeneric(keys ...[]byte) ([][]byte, error) {
 		}
 
 		for _, m := range members {
-			if _, ok := destMap[String(m)]; !ok {
+			if _, ok := destMap[hack.String(m)]; !ok {
 				continue
 			} else if ok {
-				delete(destMap, String(m))
+				delete(destMap, hack.String(m))
 			}
 		}
 		// O - A = O, O is zero set.
@@ -294,7 +295,7 @@ func (db *DB) sInterGeneric(keys ...[]byte) ([][]byte, error) {
 	}
 
 	for _, m := range members {
-		destMap[String(m)] = true
+		destMap[hack.String(m)] = true
 	}
 
 	for _, key := range keys[1:] {
@@ -314,8 +315,8 @@ func (db *DB) sInterGeneric(keys ...[]byte) ([][]byte, error) {
 			if err := checkKeySize(member); err != nil {
 				return nil, err
 			}
-			if _, ok := destMap[String(member)]; ok {
+			if _, ok := destMap[hack.String(member)]; ok {
-				tempMap[String(member)] = true //mark this item as selected
+				tempMap[hack.String(member)] = true //mark this item as selected
 			}
 		}
 		destMap = tempMap //reduce the size of the result set
@@ -439,7 +440,7 @@ func (db *DB) sUnionGeneric(keys ...[]byte) ([][]byte, error) {
 		}
 
 		for _, member := range members {
-			dstMap[String(member)] = true
+			dstMap[hack.String(member)] = true
 		}
 	}
 
@@ -508,14 +509,14 @@ func (db *DB) sStoreGeneric(dstKey []byte, optType byte, keys ...[]byte) (int64,
 		t.Put(ek, nil)
 	}
 
-	var num = int64(len(v))
+	var n = int64(len(v))
 	sk := db.sEncodeSizeKey(dstKey)
-	t.Put(sk, PutInt64(num))
+	t.Put(sk, PutInt64(n))
 
 	if err = t.Commit(); err != nil {
 		return 0, err
 	}
-	return num, nil
+	return n, nil
 }
 
 func (db *DB) SClear(key []byte) (int64, error) {

ledis/t_ttl.go

@@ -111,22 +111,6 @@ func (db *DB) rmExpire(t *batch, dataType byte, key []byte) (int64, error) {
 	}
 }
 
-func (db *DB) expFlush(t *batch, dataType byte) (err error) {
-	minKey := make([]byte, 3)
-	minKey[0] = db.index
-	minKey[1] = ExpTimeType
-	minKey[2] = dataType
-
-	maxKey := make([]byte, 3)
-	maxKey[0] = db.index
-	maxKey[1] = ExpMetaType
-	maxKey[2] = dataType + 1
-
-	_, err = db.flushRegion(t, minKey, maxKey)
-	err = t.Commit()
-	return
-}
-
 //////////////////////////////////////////////////////////
 //
 //////////////////////////////////////////////////////////

ledis/t_ttl_test.go

@@ -2,6 +2,7 @@ package ledis
 
 import (
 	"fmt"
+	"github.com/siddontang/go/hack"
 	"sync"
 	"testing"
 	"time"
@@ -49,7 +50,7 @@ func listAdaptor(db *DB) *adaptor {
 	adp.set = func(k []byte, v []byte) (int64, error) {
 		eles := make([][]byte, 0)
 		for i := 0; i < 3; i++ {
-			e := []byte(String(v) + fmt.Sprintf("_%d", i))
+			e := []byte(hack.String(v) + fmt.Sprintf("_%d", i))
 			eles = append(eles, e)
 		}
 
@@ -87,8 +88,8 @@ func hashAdaptor(db *DB) *adaptor {
 		for i := 0; i < 3; i++ {
 			suffix := fmt.Sprintf("_%d", i)
 			pair := FVPair{
-				Field: []byte(String(k) + suffix),
+				Field: []byte(hack.String(k) + suffix),
-				Value: []byte(String(v) + suffix)}
+				Value: []byte(hack.String(v) + suffix)}
 
 			datas = append(datas, pair)
 		}
@@ -125,7 +126,7 @@ func zsetAdaptor(db *DB) *adaptor {
 	adp.set = func(k []byte, v []byte) (int64, error) {
 		datas := make([]ScorePair, 0)
 		for i := 0; i < 3; i++ {
-			memb := []byte(String(k) + fmt.Sprintf("_%d", i))
+			memb := []byte(hack.String(k) + fmt.Sprintf("_%d", i))
 			pair := ScorePair{
 				Score:  int64(i),
 				Member: memb}
@@ -165,7 +166,7 @@ func setAdaptor(db *DB) *adaptor {
 	adp.set = func(k []byte, v []byte) (int64, error) {
 		eles := make([][]byte, 0)
 		for i := 0; i < 3; i++ {
-			e := []byte(String(v) + fmt.Sprintf("_%d", i))
+			e := []byte(hack.String(v) + fmt.Sprintf("_%d", i))
 			eles = append(eles, e)
 		}
 

ledis/t_zset.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"github.com/siddontang/go/hack"
 	"github.com/siddontang/ledisdb/store"
 	"time"
 )
@@ -305,7 +306,6 @@ func (db *DB) ZAdd(key []byte, args ...ScorePair) (int64, error) {
 		return 0, err
 	}
 
-	//todo add binlog
 	err := t.Commit()
 	return num, err
 }
@@ -834,10 +834,10 @@ func (db *DB) ZUnionStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 			return 0, err
 		}
 		for _, pair := range scorePairs {
-			if score, ok := destMap[String(pair.Member)]; !ok {
+			if score, ok := destMap[hack.String(pair.Member)]; !ok {
-				destMap[String(pair.Member)] = pair.Score * weights[i]
+				destMap[hack.String(pair.Member)] = pair.Score * weights[i]
 			} else {
-				destMap[String(pair.Member)] = aggregateFunc(score, pair.Score*weights[i])
+				destMap[hack.String(pair.Member)] = aggregateFunc(score, pair.Score*weights[i])
 			}
 		}
 	}
@@ -858,15 +858,14 @@ func (db *DB) ZUnionStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 		}
 	}
 
-	var num = int64(len(destMap))
+	var n = int64(len(destMap))
 	sk := db.zEncodeSizeKey(destKey)
-	t.Put(sk, PutInt64(num))
+	t.Put(sk, PutInt64(n))
 
-	//todo add binlog
 	if err := t.Commit(); err != nil {
 		return 0, err
 	}
-	return num, nil
+	return n, nil
 }
 
 func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, aggregate byte) (int64, error) {
@@ -895,7 +894,7 @@ func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 		return 0, err
 	}
 	for _, pair := range scorePairs {
-		destMap[String(pair.Member)] = pair.Score * weights[0]
+		destMap[hack.String(pair.Member)] = pair.Score * weights[0]
 	}
 
 	for i, key := range srcKeys[1:] {
@@ -905,8 +904,8 @@ func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 		}
 		tmpMap := map[string]int64{}
 		for _, pair := range scorePairs {
-			if score, ok := destMap[String(pair.Member)]; ok {
+			if score, ok := destMap[hack.String(pair.Member)]; ok {
-				tmpMap[String(pair.Member)] = aggregateFunc(score, pair.Score*weights[i+1])
+				tmpMap[hack.String(pair.Member)] = aggregateFunc(score, pair.Score*weights[i+1])
 			}
 		}
 		destMap = tmpMap
@@ -927,16 +926,96 @@ func (db *DB) ZInterStore(destKey []byte, srcKeys [][]byte, weights []int64, agg
 		}
 	}
 
-	var num int64 = int64(len(destMap))
+	var n int64 = int64(len(destMap))
 	sk := db.zEncodeSizeKey(destKey)
-	t.Put(sk, PutInt64(num))
+	t.Put(sk, PutInt64(n))
-	//todo add binlog
+
 	if err := t.Commit(); err != nil {
 		return 0, err
 	}
-	return num, nil
+	return n, nil
 }
 
 func (db *DB) ZScan(key []byte, count int, inclusive bool, match string) ([][]byte, error) {
 	return db.scan(ZSizeType, key, count, inclusive, match)
 }
+
+func (db *DB) ZRangeByLex(key []byte, min []byte, max []byte, rangeType uint8, offset int, count int) ([][]byte, error) {
+	if min == nil {
+		min = db.zEncodeStartSetKey(key)
+	} else {
+		min = db.zEncodeSetKey(key, min)
+	}
+	if max == nil {
+		max = db.zEncodeStopSetKey(key)
+	} else {
+		max = db.zEncodeSetKey(key, max)
+	}
+
+	it := db.bucket.RangeLimitIterator(min, max, rangeType, offset, count)
+	defer it.Close()
+
+	ay := make([][]byte, 0, 16)
+	for ; it.Valid(); it.Next() {
+		if _, m, err := db.zDecodeSetKey(it.Key()); err == nil {
+			ay = append(ay, m)
+		}
+	}
+
+	return ay, nil
+}
+
+func (db *DB) ZRemRangeByLex(key []byte, min []byte, max []byte, rangeType uint8) (int64, error) {
+	if min == nil {
+		min = db.zEncodeStartSetKey(key)
+	} else {
+		min = db.zEncodeSetKey(key, min)
+	}
+	if max == nil {
+		max = db.zEncodeStopSetKey(key)
+	} else {
+		max = db.zEncodeSetKey(key, max)
+	}
+
+	t := db.zsetBatch
+	t.Lock()
+	defer t.Unlock()
+
+	it := db.bucket.RangeIterator(min, max, rangeType)
+	defer it.Close()
+
+	var n int64 = 0
+	for ; it.Valid(); it.Next() {
+		t.Delete(it.RawKey())
+		n++
+	}
+
+	if err := t.Commit(); err != nil {
+		return 0, err
+	}
+
+	return n, nil
+}
+
+func (db *DB) ZLexCount(key []byte, min []byte, max []byte, rangeType uint8) (int64, error) {
+	if min == nil {
+		min = db.zEncodeStartSetKey(key)
+	} else {
+		min = db.zEncodeSetKey(key, min)
+	}
+	if max == nil {
+		max = db.zEncodeStopSetKey(key)
+	} else {
+		max = db.zEncodeSetKey(key, max)
+	}
+
+	it := db.bucket.RangeIterator(min, max, rangeType)
+	defer it.Close()
+
+	var n int64 = 0
+	for ; it.Valid(); it.Next() {
+		n++
+	}
+
+	return n, nil
+}

ledis/t_zset_test.go

@@ -2,6 +2,8 @@ package ledis
 
 import (
 	"fmt"
+	"github.com/siddontang/ledisdb/store"
+	"reflect"
 	"testing"
 )
 
@@ -407,3 +409,59 @@ func TestZScan(t *testing.T) {
 		t.Fatal("invalid value length ", len(v))
 	}
 }
+
+func TestZLex(t *testing.T) {
+	db := getTestDB()
+	if _, err := db.zFlush(); err != nil {
+		t.Fatal(err)
+	}
+
+	key := []byte("myzset")
+	if _, err := db.ZAdd(key, ScorePair{0, []byte("a")},
+		ScorePair{0, []byte("b")},
+		ScorePair{0, []byte("c")},
+		ScorePair{0, []byte("d")},
+		ScorePair{0, []byte("e")},
+		ScorePair{0, []byte("f")},
+		ScorePair{0, []byte("g")}); err != nil {
+		t.Fatal(err)
+	}
+
+	if ay, err := db.ZRangeByLex(key, nil, []byte("c"), store.RangeClose, 0, -1); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, [][]byte{[]byte("a"), []byte("b"), []byte("c")}) {
+		t.Fatal("must equal a, b, c")
+	}
+
+	if ay, err := db.ZRangeByLex(key, nil, []byte("c"), store.RangeROpen, 0, -1); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, [][]byte{[]byte("a"), []byte("b")}) {
+		t.Fatal("must equal a, b")
+	}
+
+	if ay, err := db.ZRangeByLex(key, []byte("aaa"), []byte("g"), store.RangeROpen, 0, -1); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, [][]byte{[]byte("b"),
+		[]byte("c"), []byte("d"), []byte("e"), []byte("f")}) {
+		t.Fatal("must equal b, c, d, e, f", fmt.Sprintf("%q", ay))
+	}
+
+	if n, err := db.ZLexCount(key, nil, nil, store.RangeClose); err != nil {
+		t.Fatal(err)
+	} else if n != 7 {
+		t.Fatal(n)
+	}
+
+	if n, err := db.ZRemRangeByLex(key, []byte("aaa"), []byte("g"), store.RangeROpen); err != nil {
+		t.Fatal(err)
+	} else if n != 5 {
+		t.Fatal(n)
+	}
+
+	if n, err := db.ZLexCount(key, nil, nil, store.RangeClose); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+}

ledis/tx.go

@@ -16,7 +16,7 @@ type Tx struct {
 
 	tx *store.Tx
 
-	logs [][]byte
+	eb *eventBatch
 }
 
 func (db *DB) IsTransaction() bool {
@@ -32,6 +32,8 @@ func (db *DB) Begin() (*Tx, error) {
 
 	tx := new(Tx)
 
+	tx.eb = new(eventBatch)
+
 	tx.DB = new(DB)
 	tx.DB.l = db.l
 
@@ -67,16 +69,10 @@ func (tx *Tx) Commit() error {
 		return ErrTxDone
 	}
 
-	tx.l.commitLock.Lock()
+	err := tx.l.handleCommit(tx.eb, tx.tx)
-	err := tx.tx.Commit()
+
 	tx.tx = nil
 
-	if len(tx.logs) > 0 {
-		tx.l.binlog.Log(tx.logs...)
-	}
-
-	tx.l.commitLock.Unlock()
-
 	tx.l.wLock.Unlock()
 
 	tx.DB.bucket = nil
@@ -90,6 +86,7 @@ func (tx *Tx) Rollback() error {
 	}
 
 	err := tx.tx.Rollback()
+	tx.eb.Reset()
 	tx.tx = nil
 
 	tx.l.wLock.Unlock()

ledis/tx_test.go

@@ -195,6 +195,7 @@ func testTx(t *testing.T, name string) {
 
 	cfg.DBName = name
 	cfg.LMDB.MapSize = 10 * 1024 * 1024
+	cfg.UseReplication = true
 
 	os.RemoveAll(cfg.DataDir)
 

ledis/util.go

@@ -3,33 +3,16 @@ package ledis
 import (
 	"encoding/binary"
 	"errors"
-	"reflect"
+	"github.com/siddontang/go/hack"
 	"strconv"
-	"unsafe"
 )
 
 var errIntNumber = errors.New("invalid integer")
 
-// no copy to change slice to string
+/*
-// use your own risk
+	Below I forget why I use little endian to store int.
-func String(b []byte) (s string) {
+	Maybe I was foolish at that time.
-	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+*/
-	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
-	pstring.Data = pbytes.Data
-	pstring.Len = pbytes.Len
-	return
-}
-
-// no copy to change string to slice
-// use your own risk
-func Slice(s string) (b []byte) {
-	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
-	pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
-	pbytes.Data = pstring.Data
-	pbytes.Len = pstring.Len
-	pbytes.Cap = pstring.Len
-	return
-}
 
 func Int64(v []byte, err error) (int64, error) {
 	if err != nil {
@@ -43,12 +26,21 @@ func Int64(v []byte, err error) (int64, error) {
 	return int64(binary.LittleEndian.Uint64(v)), nil
 }
 
+func Uint64(v []byte, err error) (uint64, error) {
+	if err != nil {
+		return 0, err
+	} else if v == nil || len(v) == 0 {
+		return 0, nil
+	} else if len(v) != 8 {
+		return 0, errIntNumber
+	}
+
+	return binary.LittleEndian.Uint64(v), nil
+}
+
 func PutInt64(v int64) []byte {
-	var b []byte
+	b := make([]byte, 8)
-	pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+	binary.LittleEndian.PutUint64(b, uint64(v))
-	pbytes.Data = uintptr(unsafe.Pointer(&v))
-	pbytes.Len = 8
-	pbytes.Cap = 8
 	return b
 }
 
@@ -58,7 +50,17 @@ func StrInt64(v []byte, err error) (int64, error) {
 	} else if v == nil {
 		return 0, nil
 	} else {
-		return strconv.ParseInt(String(v), 10, 64)
+		return strconv.ParseInt(hack.String(v), 10, 64)
+	}
+}
+
+func StrUint64(v []byte, err error) (uint64, error) {
+	if err != nil {
+		return 0, err
+	} else if v == nil {
+		return 0, nil
+	} else {
+		return strconv.ParseUint(hack.String(v), 10, 64)
 	}
 }
 
@@ -68,7 +70,7 @@ func StrInt32(v []byte, err error) (int32, error) {
 	} else if v == nil {
 		return 0, nil
 	} else {
-		res, err := strconv.ParseInt(String(v), 10, 32)
+		res, err := strconv.ParseInt(hack.String(v), 10, 32)
 		return int32(res), err
 	}
 }
@@ -79,35 +81,14 @@ func StrInt8(v []byte, err error) (int8, error) {
 	} else if v == nil {
 		return 0, nil
 	} else {
-		res, err := strconv.ParseInt(String(v), 10, 8)
+		res, err := strconv.ParseInt(hack.String(v), 10, 8)
 		return int8(res), err
 	}
 }
 
-func StrPutInt64(v int64) []byte {
+func AsyncNotify(ch chan struct{}) {
-	return strconv.AppendInt(nil, v, 10)
+	select {
-}
+	case ch <- struct{}{}:
-
+	default:
-func MinUInt32(a uint32, b uint32) uint32 {
-	if a > b {
-		return b
-	} else {
-		return a
-	}
-}
-
-func MaxUInt32(a uint32, b uint32) uint32 {
-	if a > b {
-		return a
-	} else {
-		return b
-	}
-}
-
-func MaxInt32(a int32, b int32) int32 {
-	if a > b {
-		return a
-	} else {
-		return b
 	}
 }

rpl/file_store.go

@@ -0,0 +1,242 @@
+package rpl
+
+import (
+	"fmt"
+	"github.com/siddontang/go/log"
+	"io/ioutil"
+	"os"
+	"path"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+const (
+	defaultMaxLogFileSize = 1024 * 1024 * 1024
+)
+
+/*
+index file format:
+ledis-bin.00001
+ledis-bin.00002
+ledis-bin.00003
+*/
+
+type FileStore struct {
+	LogStore
+
+	m sync.Mutex
+
+	maxFileSize int
+
+	first uint64
+	last  uint64
+
+	logFile      *os.File
+	logNames     []string
+	nextLogIndex int64
+
+	indexName string
+
+	path string
+}
+
+func NewFileStore(path string) (*FileStore, error) {
+	s := new(FileStore)
+
+	if err := os.MkdirAll(path, 0755); err != nil {
+		return nil, err
+	}
+
+	s.path = path
+
+	s.maxFileSize = defaultMaxLogFileSize
+
+	s.first = 0
+	s.last = 0
+
+	s.logNames = make([]string, 0, 16)
+
+	if err := s.loadIndex(); err != nil {
+		return nil, err
+	}
+
+	return s, nil
+}
+
+func (s *FileStore) SetMaxFileSize(size int) {
+	s.maxFileSize = size
+}
+
+func (s *FileStore) GetLog(id uint64, log *Log) error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) SeekLog(id uint64, log *Log) error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) FirstID() (uint64, error) {
+	panic("not implementation")
+	return 0, nil
+}
+
+func (s *FileStore) LastID() (uint64, error) {
+	panic("not implementation")
+	return 0, nil
+}
+
+func (s *FileStore) StoreLog(log *Log) error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) StoreLogs(logs []*Log) error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) Purge(n uint64) error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) PuregeExpired(n int64) error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) Clear() error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) Close() error {
+	panic("not implementation")
+	return nil
+}
+
+func (s *FileStore) flushIndex() error {
+	data := strings.Join(s.logNames, "\n")
+
+	bakName := fmt.Sprintf("%s.bak", s.indexName)
+	f, err := os.OpenFile(bakName, os.O_WRONLY|os.O_CREATE, 0644)
+	if err != nil {
+		log.Error("create bak index error %s", err.Error())
+		return err
+	}
+
+	if _, err := f.WriteString(data); err != nil {
+		log.Error("write index error %s", err.Error())
+		f.Close()
+		return err
+	}
+
+	f.Close()
+
+	if err := os.Rename(bakName, s.indexName); err != nil {
+		log.Error("rename bak index error %s", err.Error())
+		return err
+	}
+
+	return nil
+}
+
+func (s *FileStore) fileExists(name string) bool {
+	p := path.Join(s.path, name)
+	_, err := os.Stat(p)
+	return !os.IsNotExist(err)
+}
+
+func (s *FileStore) loadIndex() error {
+	s.indexName = path.Join(s.path, fmt.Sprintf("ledis-bin.index"))
+	if _, err := os.Stat(s.indexName); os.IsNotExist(err) {
+		//no index file, nothing to do
+	} else {
+		indexData, err := ioutil.ReadFile(s.indexName)
+		if err != nil {
+			return err
+		}
+
+		lines := strings.Split(string(indexData), "\n")
+		for _, line := range lines {
+			line = strings.Trim(line, "\r\n ")
+			if len(line) == 0 {
+				continue
+			}
+
+			if s.fileExists(line) {
+				s.logNames = append(s.logNames, line)
+			} else {
+				log.Info("log %s has not exists", line)
+			}
+		}
+	}
+
+	var err error
+	if len(s.logNames) == 0 {
+		s.nextLogIndex = 1
+	} else {
+		lastName := s.logNames[len(s.logNames)-1]
+
+		if s.nextLogIndex, err = strconv.ParseInt(path.Ext(lastName)[1:], 10, 64); err != nil {
+			log.Error("invalid logfile name %s", err.Error())
+			return err
+		}
+
+		//like mysql, if server restart, a new log will create
+		s.nextLogIndex++
+	}
+
+	return nil
+}
+
+func (s *FileStore) openNewLogFile() error {
+	var err error
+	lastName := s.formatLogFileName(s.nextLogIndex)
+
+	logPath := path.Join(s.path, lastName)
+	if s.logFile, err = os.OpenFile(logPath, os.O_CREATE|os.O_WRONLY, 0644); err != nil {
+		log.Error("open new logfile error %s", err.Error())
+		return err
+	}
+
+	s.logNames = append(s.logNames, lastName)
+
+	if err = s.flushIndex(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *FileStore) checkLogFileSize() bool {
+	if s.logFile == nil {
+		return false
+	}
+
+	st, _ := s.logFile.Stat()
+	if st.Size() >= int64(s.maxFileSize) {
+		s.closeLog()
+		return true
+	}
+
+	return false
+}
+
+func (s *FileStore) closeLog() {
+	if s.logFile == nil {
+		return
+	}
+
+	s.nextLogIndex++
+
+	s.logFile.Close()
+	s.logFile = nil
+}
+
+func (s *FileStore) formatLogFileName(index int64) string {
+	return fmt.Sprintf("ledis-bin.%07d", index)
+}

rpl/goleveldb_store.go

@@ -0,0 +1,276 @@
+package rpl
+
+import (
+	"bytes"
+	"fmt"
+	"github.com/siddontang/go/num"
+	"github.com/siddontang/ledisdb/config"
+	"github.com/siddontang/ledisdb/store"
+	"os"
+	"sync"
+	"time"
+)
+
+type GoLevelDBStore struct {
+	LogStore
+
+	m  sync.Mutex
+	db *store.DB
+
+	cfg *config.Config
+
+	first uint64
+	last  uint64
+}
+
+func (s *GoLevelDBStore) FirstID() (uint64, error) {
+	s.m.Lock()
+	id, err := s.firstID()
+	s.m.Unlock()
+
+	return id, err
+}
+
+func (s *GoLevelDBStore) LastID() (uint64, error) {
+	s.m.Lock()
+	id, err := s.lastID()
+	s.m.Unlock()
+
+	return id, err
+}
+
+func (s *GoLevelDBStore) firstID() (uint64, error) {
+	if s.first != InvalidLogID {
+		return s.first, nil
+	}
+
+	it := s.db.NewIterator()
+	defer it.Close()
+
+	it.SeekToFirst()
+
+	if it.Valid() {
+		s.first = num.BytesToUint64(it.RawKey())
+	}
+
+	return s.first, nil
+}
+
+func (s *GoLevelDBStore) lastID() (uint64, error) {
+	if s.last != InvalidLogID {
+		return s.last, nil
+	}
+
+	it := s.db.NewIterator()
+	defer it.Close()
+
+	it.SeekToLast()
+
+	if it.Valid() {
+		s.last = num.BytesToUint64(it.RawKey())
+	}
+
+	return s.last, nil
+}
+
+func (s *GoLevelDBStore) GetLog(id uint64, log *Log) error {
+	v, err := s.db.Get(num.Uint64ToBytes(id))
+	if err != nil {
+		return err
+	} else if v == nil {
+		return ErrLogNotFound
+	} else {
+		return log.Decode(bytes.NewBuffer(v))
+	}
+}
+
+func (s *GoLevelDBStore) SeekLog(id uint64, log *Log) error {
+	it := s.db.NewIterator()
+	defer it.Close()
+
+	it.Seek(num.Uint64ToBytes(id))
+
+	if !it.Valid() {
+		return ErrLogNotFound
+	} else {
+		return log.Decode(bytes.NewBuffer(it.RawValue()))
+	}
+}
+
+func (s *GoLevelDBStore) StoreLog(log *Log) error {
+	return s.StoreLogs([]*Log{log})
+}
+
+func (s *GoLevelDBStore) StoreLogs(logs []*Log) error {
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	w := s.db.NewWriteBatch()
+	defer w.Rollback()
+
+	last, err := s.lastID()
+	if err != nil {
+		return err
+	}
+
+	s.last = InvalidLogID
+
+	var buf bytes.Buffer
+	for _, log := range logs {
+		buf.Reset()
+
+		if log.ID <= last {
+			return ErrLessLogID
+		}
+
+		last = log.ID
+		key := num.Uint64ToBytes(log.ID)
+
+		if err := log.Encode(&buf); err != nil {
+			return err
+		}
+		w.Put(key, buf.Bytes())
+	}
+
+	if err := w.Commit(); err != nil {
+		return err
+	}
+
+	s.last = last
+	return nil
+}
+
+func (s *GoLevelDBStore) Purge(n uint64) error {
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	var first, last uint64
+	var err error
+
+	first, err = s.firstID()
+	if err != nil {
+		return err
+	}
+
+	last, err = s.lastID()
+	if err != nil {
+		return err
+	}
+
+	start := first
+	stop := num.MinUint64(last, first+n)
+
+	w := s.db.NewWriteBatch()
+	defer w.Rollback()
+
+	s.reset()
+
+	for i := start; i < stop; i++ {
+		w.Delete(num.Uint64ToBytes(i))
+	}
+
+	if err = w.Commit(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *GoLevelDBStore) PurgeExpired(n int64) error {
+	if n <= 0 {
+		return fmt.Errorf("invalid expired time %d", n)
+	}
+
+	t := uint32(time.Now().Unix() - int64(n))
+
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	s.reset()
+
+	it := s.db.NewIterator()
+	it.SeekToFirst()
+
+	w := s.db.NewWriteBatch()
+	defer w.Rollback()
+
+	l := new(Log)
+	for ; it.Valid(); it.Next() {
+		v := it.RawValue()
+
+		if err := l.Unmarshal(v); err != nil {
+			return err
+		} else if l.CreateTime > t {
+			break
+		} else {
+			w.Delete(it.RawKey())
+		}
+	}
+
+	if err := w.Commit(); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (s *GoLevelDBStore) Clear() error {
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	if s.db != nil {
+		s.db.Close()
+	}
+
+	s.reset()
+	os.RemoveAll(s.cfg.DBPath)
+
+	return s.open()
+}
+
+func (s *GoLevelDBStore) reset() {
+	s.first = InvalidLogID
+	s.last = InvalidLogID
+}
+
+func (s *GoLevelDBStore) Close() error {
+	s.m.Lock()
+	defer s.m.Unlock()
+
+	if s.db == nil {
+		return nil
+	}
+
+	err := s.db.Close()
+	s.db = nil
+	return err
+}
+
+func (s *GoLevelDBStore) open() error {
+	var err error
+
+	s.first = InvalidLogID
+	s.last = InvalidLogID
+
+	s.db, err = store.Open(s.cfg)
+	return err
+}
+
+func NewGoLevelDBStore(base string) (*GoLevelDBStore, error) {
+	cfg := new(config.Config)
+	cfg.DBName = "goleveldb"
+	cfg.DBPath = base
+	cfg.LevelDB.BlockSize = 4 * 1024 * 1024
+	cfg.LevelDB.CacheSize = 16 * 1024 * 1024
+	cfg.LevelDB.WriteBufferSize = 4 * 1024 * 1024
+	cfg.LevelDB.Compression = false
+
+	s := new(GoLevelDBStore)
+	s.cfg = cfg
+
+	if err := s.open(); err != nil {
+		return nil, err
+	}
+
+	return s, nil
+}

rpl/log.go

@@ -0,0 +1,102 @@
+package rpl
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+)
+
+type Log struct {
+	ID          uint64
+	CreateTime  uint32
+	Compression uint8
+
+	Data []byte
+}
+
+func (l *Log) HeadSize() int {
+	return 17
+}
+
+func (l *Log) Size() int {
+	return l.HeadSize() + len(l.Data)
+}
+
+func (l *Log) Marshal() ([]byte, error) {
+	buf := bytes.NewBuffer(make([]byte, l.HeadSize()+len(l.Data)))
+	buf.Reset()
+
+	if err := l.Encode(buf); err != nil {
+		return nil, err
+	}
+
+	return buf.Bytes(), nil
+}
+
+func (l *Log) Unmarshal(b []byte) error {
+	buf := bytes.NewBuffer(b)
+
+	return l.Decode(buf)
+}
+
+func (l *Log) Encode(w io.Writer) error {
+	buf := make([]byte, l.HeadSize())
+
+	pos := 0
+	binary.BigEndian.PutUint64(buf[pos:], l.ID)
+	pos += 8
+
+	binary.BigEndian.PutUint32(buf[pos:], l.CreateTime)
+	pos += 4
+
+	buf[pos] = l.Compression
+	pos++
+
+	binary.BigEndian.PutUint32(buf[pos:], uint32(len(l.Data)))
+
+	if n, err := w.Write(buf); err != nil {
+		return err
+	} else if n != len(buf) {
+		return io.ErrShortWrite
+	}
+
+	if n, err := w.Write(l.Data); err != nil {
+		return err
+	} else if n != len(l.Data) {
+		return io.ErrShortWrite
+	}
+	return nil
+}
+
+func (l *Log) Decode(r io.Reader) error {
+	buf := make([]byte, l.HeadSize())
+
+	if _, err := io.ReadFull(r, buf); err != nil {
+		return err
+	}
+
+	pos := 0
+	l.ID = binary.BigEndian.Uint64(buf[pos:])
+	pos += 8
+
+	l.CreateTime = binary.BigEndian.Uint32(buf[pos:])
+	pos += 4
+
+	l.Compression = uint8(buf[pos])
+	pos++
+
+	length := binary.BigEndian.Uint32(buf[pos:])
+
+	l.Data = l.Data[0:0]
+
+	if cap(l.Data) >= int(length) {
+		l.Data = l.Data[0:length]
+	} else {
+		l.Data = make([]byte, length)
+	}
+	if _, err := io.ReadFull(r, l.Data); err != nil {
+		return err
+	}
+
+	return nil
+}

rpl/log_test.go

@@ -0,0 +1,39 @@
+package rpl
+
+import (
+	"bytes"
+	"reflect"
+	"testing"
+)
+
+func TestLog(t *testing.T) {
+	l1 := &Log{ID: 1, CreateTime: 100, Data: []byte("hello world")}
+
+	var buf bytes.Buffer
+
+	if err := l1.Encode(&buf); err != nil {
+		t.Fatal(err)
+	}
+
+	l2 := &Log{}
+
+	if err := l2.Decode(&buf); err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(l1, l2) {
+		t.Fatal("must equal")
+	}
+
+	if buf, err := l1.Marshal(); err != nil {
+		t.Fatal(err)
+	} else {
+		if err = l2.Unmarshal(buf); err != nil {
+			t.Fatal(err)
+		}
+	}
+
+	if !reflect.DeepEqual(l1, l2) {
+		t.Fatal("must equal")
+	}
+}

rpl/rpl.go

@@ -0,0 +1,274 @@
+package rpl
+
+import (
+	"encoding/binary"
+	"github.com/siddontang/go/log"
+	"github.com/siddontang/go/snappy"
+	"github.com/siddontang/ledisdb/config"
+	"os"
+	"path"
+	"sync"
+	"time"
+)
+
+type Stat struct {
+	FirstID  uint64
+	LastID   uint64
+	CommitID uint64
+}
+
+type Replication struct {
+	m sync.Mutex
+
+	cfg *config.Config
+
+	s LogStore
+
+	commitID  uint64
+	commitLog *os.File
+
+	quit chan struct{}
+
+	wg sync.WaitGroup
+
+	nc chan struct{}
+}
+
+func NewReplication(cfg *config.Config) (*Replication, error) {
+	if len(cfg.Replication.Path) == 0 {
+		cfg.Replication.Path = path.Join(cfg.DataDir, "rpl")
+	}
+
+	base := cfg.Replication.Path
+
+	r := new(Replication)
+
+	r.quit = make(chan struct{})
+	r.nc = make(chan struct{})
+
+	r.cfg = cfg
+
+	var err error
+	if r.s, err = NewGoLevelDBStore(path.Join(base, "wal")); err != nil {
+		return nil, err
+	}
+
+	if r.commitLog, err = os.OpenFile(path.Join(base, "commit.log"), os.O_RDWR|os.O_CREATE, 0644); err != nil {
+		return nil, err
+	}
+
+	if s, _ := r.commitLog.Stat(); s.Size() == 0 {
+		r.commitID = 0
+	} else if err = binary.Read(r.commitLog, binary.BigEndian, &r.commitID); err != nil {
+		return nil, err
+	}
+
+	go r.onPurgeExpired()
+
+	return r, nil
+}
+
+func (r *Replication) Close() error {
+	close(r.quit)
+
+	r.wg.Wait()
+
+	if r.s != nil {
+		r.s.Close()
+		r.s = nil
+	}
+
+	if r.commitLog != nil {
+		r.commitLog.Close()
+		r.commitLog = nil
+	}
+
+	return nil
+}
+
+func (r *Replication) Log(data []byte) (*Log, error) {
+	if r.cfg.Replication.Compression {
+		//todo optimize
+		var err error
+		if data, err = snappy.Encode(nil, data); err != nil {
+			return nil, err
+		}
+	}
+
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	lastID, err := r.s.LastID()
+	if err != nil {
+		return nil, err
+	}
+
+	commitId := r.commitID
+	if lastID < commitId {
+		lastID = commitId
+	}
+
+	l := new(Log)
+	l.ID = lastID + 1
+	l.CreateTime = uint32(time.Now().Unix())
+
+	if r.cfg.Replication.Compression {
+		l.Compression = 1
+	} else {
+		l.Compression = 0
+	}
+
+	l.Data = data
+
+	if err = r.s.StoreLog(l); err != nil {
+		return nil, err
+	}
+
+	close(r.nc)
+	r.nc = make(chan struct{})
+
+	return l, nil
+}
+
+func (r *Replication) WaitLog() <-chan struct{} {
+	return r.nc
+}
+
+func (r *Replication) StoreLog(log *Log) error {
+	return r.StoreLogs([]*Log{log})
+}
+
+func (r *Replication) StoreLogs(logs []*Log) error {
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	return r.s.StoreLogs(logs)
+}
+
+func (r *Replication) FirstLogID() (uint64, error) {
+	r.m.Lock()
+	defer r.m.Unlock()
+	id, err := r.s.FirstID()
+	return id, err
+}
+
+func (r *Replication) LastLogID() (uint64, error) {
+	r.m.Lock()
+	defer r.m.Unlock()
+	id, err := r.s.LastID()
+	return id, err
+}
+
+func (r *Replication) LastCommitID() (uint64, error) {
+	r.m.Lock()
+	id := r.commitID
+	r.m.Unlock()
+	return id, nil
+}
+
+func (r *Replication) UpdateCommitID(id uint64) error {
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	return r.updateCommitID(id)
+}
+
+func (r *Replication) Stat() (*Stat, error) {
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	s := &Stat{}
+	var err error
+
+	if s.FirstID, err = r.s.FirstID(); err != nil {
+		return nil, err
+	}
+
+	if s.LastID, err = r.s.LastID(); err != nil {
+		return nil, err
+	}
+
+	s.CommitID = r.commitID
+	return s, nil
+}
+
+func (r *Replication) updateCommitID(id uint64) error {
+	if _, err := r.commitLog.Seek(0, os.SEEK_SET); err != nil {
+		return err
+	}
+
+	if err := binary.Write(r.commitLog, binary.BigEndian, id); err != nil {
+		return err
+	}
+
+	r.commitID = id
+
+	return nil
+}
+
+func (r *Replication) CommitIDBehind() (bool, error) {
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	id, err := r.s.LastID()
+	if err != nil {
+		return false, err
+	}
+
+	return id > r.commitID, nil
+}
+
+func (r *Replication) GetLog(id uint64, log *Log) error {
+	return r.s.GetLog(id, log)
+}
+
+func (r *Replication) NextNeedCommitLog(log *Log) error {
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	id, err := r.s.LastID()
+	if err != nil {
+		return err
+	}
+
+	if id <= r.commitID {
+		return ErrNoBehindLog
+	}
+
+	return r.s.GetLog(r.commitID+1, log)
+
+}
+
+func (r *Replication) Clear() error {
+	return r.ClearWithCommitID(0)
+}
+
+func (r *Replication) ClearWithCommitID(id uint64) error {
+	r.m.Lock()
+	defer r.m.Unlock()
+
+	if err := r.s.Clear(); err != nil {
+		return err
+	}
+
+	return r.updateCommitID(id)
+}
+
+func (r *Replication) onPurgeExpired() {
+	r.wg.Add(1)
+	defer r.wg.Done()
+
+	for {
+		select {
+		case <-time.After(1 * time.Hour):
+			n := (r.cfg.Replication.ExpiredLogDays * 24 * 3600)
+			r.m.Lock()
+			if err := r.s.PurgeExpired(int64(n)); err != nil {
+				log.Error("purge expired log error %s", err.Error())
+			}
+			r.m.Unlock()
+		case <-r.quit:
+			return
+		}
+	}
+}

rpl/rpl_test.go

@@ -0,0 +1,44 @@
+package rpl
+
+import (
+	"github.com/siddontang/ledisdb/config"
+	"io/ioutil"
+	"os"
+	"testing"
+)
+
+func TestReplication(t *testing.T) {
+	dir, err := ioutil.TempDir("", "rpl")
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	defer os.RemoveAll(dir)
+
+	c := new(config.Config)
+	c.Replication.Path = dir
+
+	r, err := NewReplication(c)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if l1, err := r.Log([]byte("hello world")); err != nil {
+		t.Fatal(err)
+	} else if l1.ID != 1 {
+		t.Fatal(l1.ID)
+	}
+
+	if b, _ := r.CommitIDBehind(); !b {
+		t.Fatal("must backward")
+	}
+
+	if err := r.UpdateCommitID(1); err != nil {
+		t.Fatal(err)
+	}
+
+	if b, _ := r.CommitIDBehind(); b {
+		t.Fatal("must not backward")
+	}
+
+	r.Close()
+}

rpl/store.go

@@ -0,0 +1,40 @@
+package rpl
+
+import (
+	"errors"
+)
+
+const (
+	InvalidLogID uint64 = 0
+)
+
+var (
+	ErrLogNotFound = errors.New("log not found")
+	ErrLessLogID   = errors.New("log id is less")
+	ErrNoBehindLog = errors.New("no behind commit log")
+)
+
+type LogStore interface {
+	GetLog(id uint64, log *Log) error
+
+	// Get the first log which ID is equal or larger than id
+	SeekLog(id uint64, log *Log) error
+
+	FirstID() (uint64, error)
+	LastID() (uint64, error)
+
+	// if log id is less than current last id, return error
+	StoreLog(log *Log) error
+	StoreLogs(logs []*Log) error
+
+	// Delete first n logs
+	Purge(n uint64) error
+
+	// Delete logs before n seconds
+	PurgeExpired(n int64) error
+
+	// Clear all logs
+	Clear() error
+
+	Close() error
+}

rpl/store_test.go

@@ -0,0 +1,189 @@
+package rpl
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestGoLevelDBStore(t *testing.T) {
+	// Create a test dir
+	dir, err := ioutil.TempDir("", "wal")
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	defer os.RemoveAll(dir)
+
+	// New level
+	l, err := NewGoLevelDBStore(dir)
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	defer l.Close()
+
+	testLogs(t, l)
+}
+
+func testLogs(t *testing.T, l LogStore) {
+	// Should be no first index
+	idx, err := l.FirstID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 0 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	// Should be no last index
+	idx, err = l.LastID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 0 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	// Try a filed fetch
+	var out Log
+	if err := l.GetLog(10, &out); err.Error() != "log not found" {
+		t.Fatalf("err: %v ", err)
+	}
+
+	// Write out a log
+	log := Log{
+		ID:   1,
+		Data: []byte("first"),
+	}
+	for i := 1; i <= 10; i++ {
+		log.ID = uint64(i)
+		if err := l.StoreLog(&log); err != nil {
+			t.Fatalf("err: %v", err)
+		}
+	}
+
+	// Attempt to write multiple logs
+	var logs []*Log
+	for i := 11; i <= 20; i++ {
+		nl := &Log{
+			ID:   uint64(i),
+			Data: []byte("first"),
+		}
+		logs = append(logs, nl)
+	}
+	if err := l.StoreLogs(logs); err != nil {
+		t.Fatalf("err: %v", err)
+	}
+
+	// Try to fetch
+	if err := l.GetLog(10, &out); err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+
+	// Try to fetch
+	if err := l.GetLog(20, &out); err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+
+	// Check the lowest index
+	idx, err = l.FirstID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 1 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	// Check the highest index
+	idx, err = l.LastID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 20 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	// Delete a suffix
+	if err := l.Purge(5); err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+
+	// Verify they are all deleted
+	for i := 1; i <= 5; i++ {
+		if err := l.GetLog(uint64(i), &out); err != ErrLogNotFound {
+			t.Fatalf("err: %v ", err)
+		}
+	}
+
+	// Index should be one
+	idx, err = l.FirstID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 6 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+	idx, err = l.LastID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 20 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	// Should not be able to fetch
+	if err := l.GetLog(5, &out); err != ErrLogNotFound {
+		t.Fatalf("err: %v ", err)
+	}
+
+	if err := l.Clear(); err != nil {
+		t.Fatal(err)
+	}
+
+	idx, err = l.FirstID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 0 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	idx, err = l.LastID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 0 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	now := uint32(time.Now().Unix())
+	logs = []*Log{}
+	for i := 1; i <= 20; i++ {
+		nl := &Log{
+			ID:         uint64(i),
+			CreateTime: now - 20,
+			Data:       []byte("first"),
+		}
+		logs = append(logs, nl)
+	}
+
+	if err := l.PurgeExpired(1); err != nil {
+		t.Fatal(err)
+	}
+
+	idx, err = l.FirstID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 0 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+
+	idx, err = l.LastID()
+	if err != nil {
+		t.Fatalf("err: %v ", err)
+	}
+	if idx != 0 {
+		t.Fatalf("bad idx: %d", idx)
+	}
+}

server/accesslog.go

@@ -1,7 +1,7 @@
 package server
 
 import (
-	"github.com/siddontang/go-log/log"
+	"github.com/siddontang/go/log"
 )
 
 const (

server/app.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"path"
 	"strings"
+	"sync"
 )
 
 type App struct {
@@ -29,6 +30,10 @@ type App struct {
 	info *info
 
 	s *script
+
+	// handle slaves
+	slock  sync.Mutex
+	slaves map[*client]struct{}
 }
 
 func netType(s string) string {
@@ -53,6 +58,8 @@ func NewApp(cfg *config.Config) (*App, error) {
 
 	app.cfg = cfg
 
+	app.slaves = make(map[*client]struct{})
+
 	var err error
 
 	if app.info, err = newInfo(app); err != nil {
@@ -81,7 +88,13 @@ func NewApp(cfg *config.Config) (*App, error) {
 		}
 	}
 
-	if app.ldb, err = ledis.Open(cfg); err != nil {
+	flag := ledis.RDWRMode
+	if len(app.cfg.SlaveOf) > 0 {
+		//slave must readonly
+		flag = ledis.ROnlyMode
+	}
+
+	if app.ldb, err = ledis.Open2(cfg, flag); err != nil {
 		return nil, err
 	}
 
@@ -89,6 +102,8 @@ func NewApp(cfg *config.Config) (*App, error) {
 
 	app.openScript()
 
+	app.ldb.AddNewLogEventHandler(app.publishNewLog)
+
 	return app, nil
 }
 
@@ -120,7 +135,7 @@ func (app *App) Close() {
 
 func (app *App) Run() {
 	if len(app.cfg.SlaveOf) > 0 {
-		app.slaveof(app.cfg.SlaveOf)
+		app.slaveof(app.cfg.SlaveOf, false)
 	}
 
 	go app.httpServe()

server/client.go

@@ -43,6 +43,11 @@ type responseWriter interface {
 	flush()
 }
 
+type syncAck struct {
+	id uint64
+	ch chan uint64
+}
+
 type client struct {
 	app *App
 	ldb *ledis.Ledis
@@ -56,13 +61,17 @@ type client struct {
 	resp responseWriter
 
 	syncBuf bytes.Buffer
-	compressBuf []byte
+
+	lastLogID uint64
+
+	ack *syncAck
 
 	reqErr chan error
 
 	buf bytes.Buffer
 
 	tx *ledis.Tx
+
 	script *ledis.Multi
 }
 
@@ -73,7 +82,6 @@ func newClient(app *App) *client {
 	c.ldb = app.ldb
 	c.db, _ = app.ldb.Select(0) //use default db
 
-	c.compressBuf = []byte{}
 	c.reqErr = make(chan error)
 
 	return c

server/client_http.go

@@ -3,8 +3,9 @@ package server
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/siddontang/go-bson/bson"
+	"github.com/siddontang/go/bson"
-	"github.com/siddontang/go-log/log"
+	"github.com/siddontang/go/hack"
+	"github.com/siddontang/go/log"
 	"github.com/siddontang/ledisdb/ledis"
 	"github.com/ugorji/go/codec"
 	"io"
@@ -154,7 +155,7 @@ func (w *httpWriter) writeBulk(b []byte) {
 	if b == nil {
 		w.genericWrite(nil)
 	} else {
-		w.genericWrite(ledis.String(b))
+		w.genericWrite(hack.String(b))
 	}
 }
 
@@ -168,7 +169,7 @@ func (w *httpWriter) writeSliceArray(lst [][]byte) {
 		if elem == nil {
 			arr[i] = nil
 		} else {
-			arr[i] = ledis.String(elem)
+			arr[i] = hack.String(elem)
 		}
 	}
 	w.genericWrite(arr)
@@ -177,7 +178,7 @@ func (w *httpWriter) writeSliceArray(lst [][]byte) {
 func (w *httpWriter) writeFVPairArray(lst []ledis.FVPair) {
 	m := make(map[string]string)
 	for _, elem := range lst {
-		m[ledis.String(elem.Field)] = ledis.String(elem.Value)
+		m[hack.String(elem.Field)] = hack.String(elem.Value)
 	}
 	w.genericWrite(m)
 }
@@ -187,13 +188,13 @@ func (w *httpWriter) writeScorePairArray(lst []ledis.ScorePair, withScores bool)
 	if withScores {
 		arr = make([]string, 2*len(lst))
 		for i, data := range lst {
-			arr[2*i] = ledis.String(data.Member)
+			arr[2*i] = hack.String(data.Member)
 			arr[2*i+1] = strconv.FormatInt(data.Score, 10)
 		}
 	} else {
 		arr = make([]string, len(lst))
 		for i, data := range lst {
-			arr[i] = ledis.String(data.Member)
+			arr[i] = hack.String(data.Member)
 		}
 	}
 	w.genericWrite(arr)

server/client_resp.go

@@ -3,7 +3,9 @@ package server
 import (
 	"bufio"
 	"errors"
-	"github.com/siddontang/go-log/log"
+	"github.com/siddontang/go/hack"
+	"github.com/siddontang/go/log"
+	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/ledis"
 	"io"
 	"net"
@@ -57,6 +59,8 @@ func (c *respClient) run() {
 			c.tx.Rollback()
 			c.tx = nil
 		}
+
+		c.app.removeSlave(c.client)
 	}()
 
 	for {
@@ -83,7 +87,7 @@ func (c *respClient) readRequest() ([][]byte, error) {
 	}
 
 	var nparams int
-	if nparams, err = strconv.Atoi(ledis.String(l[1:])); err != nil {
+	if nparams, err = strconv.Atoi(hack.String(l[1:])); err != nil {
 		return nil, err
 	} else if nparams <= 0 {
 		return nil, errReadRequest
@@ -100,7 +104,7 @@ func (c *respClient) readRequest() ([][]byte, error) {
 			return nil, errReadRequest
 		} else if l[0] == '$' {
 			//handle resp string
-			if n, err = strconv.Atoi(ledis.String(l[1:])); err != nil {
+			if n, err = strconv.Atoi(hack.String(l[1:])); err != nil {
 				return nil, err
 			} else if n == -1 {
 				req = append(req, nil)
@@ -133,7 +137,7 @@ func (c *respClient) handleRequest(reqData [][]byte) {
 		c.cmd = ""
 		c.args = reqData[0:0]
 	} else {
-		c.cmd = strings.ToLower(ledis.String(reqData[0]))
+		c.cmd = strings.ToLower(hack.String(reqData[0]))
 		c.args = reqData[1:]
 	}
 	if c.cmd == "quit" {
@@ -157,23 +161,23 @@ func newWriterRESP(conn net.Conn) *respWriter {
 }
 
 func (w *respWriter) writeError(err error) {
-	w.buff.Write(ledis.Slice("-ERR"))
+	w.buff.Write(hack.Slice("-ERR"))
 	if err != nil {
 		w.buff.WriteByte(' ')
-		w.buff.Write(ledis.Slice(err.Error()))
+		w.buff.Write(hack.Slice(err.Error()))
 	}
 	w.buff.Write(Delims)
 }
 
 func (w *respWriter) writeStatus(status string) {
 	w.buff.WriteByte('+')
-	w.buff.Write(ledis.Slice(status))
+	w.buff.Write(hack.Slice(status))
 	w.buff.Write(Delims)
 }
 
 func (w *respWriter) writeInteger(n int64) {
 	w.buff.WriteByte(':')
-	w.buff.Write(ledis.StrPutInt64(n))
+	w.buff.Write(num.FormatInt64ToSlice(n))
 	w.buff.Write(Delims)
 }
 
@@ -182,7 +186,7 @@ func (w *respWriter) writeBulk(b []byte) {
 	if b == nil {
 		w.buff.Write(NullBulk)
 	} else {
-		w.buff.Write(ledis.Slice(strconv.Itoa(len(b))))
+		w.buff.Write(hack.Slice(strconv.Itoa(len(b))))
 		w.buff.Write(Delims)
 		w.buff.Write(b)
 	}
@@ -196,7 +200,7 @@ func (w *respWriter) writeArray(lst []interface{}) {
 		w.buff.Write(NullArray)
 		w.buff.Write(Delims)
 	} else {
-		w.buff.Write(ledis.Slice(strconv.Itoa(len(lst))))
+		w.buff.Write(hack.Slice(strconv.Itoa(len(lst))))
 		w.buff.Write(Delims)
 
 		for i := 0; i < len(lst); i++ {
@@ -224,7 +228,7 @@ func (w *respWriter) writeSliceArray(lst [][]byte) {
 		w.buff.Write(NullArray)
 		w.buff.Write(Delims)
 	} else {
-		w.buff.Write(ledis.Slice(strconv.Itoa(len(lst))))
+		w.buff.Write(hack.Slice(strconv.Itoa(len(lst))))
 		w.buff.Write(Delims)
 
 		for i := 0; i < len(lst); i++ {
@@ -239,7 +243,7 @@ func (w *respWriter) writeFVPairArray(lst []ledis.FVPair) {
 		w.buff.Write(NullArray)
 		w.buff.Write(Delims)
 	} else {
-		w.buff.Write(ledis.Slice(strconv.Itoa(len(lst) * 2)))
+		w.buff.Write(hack.Slice(strconv.Itoa(len(lst) * 2)))
 		w.buff.Write(Delims)
 
 		for i := 0; i < len(lst); i++ {
@@ -256,10 +260,10 @@ func (w *respWriter) writeScorePairArray(lst []ledis.ScorePair, withScores bool)
 		w.buff.Write(Delims)
 	} else {
 		if withScores {
-			w.buff.Write(ledis.Slice(strconv.Itoa(len(lst) * 2)))
+			w.buff.Write(hack.Slice(strconv.Itoa(len(lst) * 2)))
 			w.buff.Write(Delims)
 		} else {
-			w.buff.Write(ledis.Slice(strconv.Itoa(len(lst))))
+			w.buff.Write(hack.Slice(strconv.Itoa(len(lst))))
 			w.buff.Write(Delims)
 
 		}
@@ -268,7 +272,7 @@ func (w *respWriter) writeScorePairArray(lst []ledis.ScorePair, withScores bool)
 			w.writeBulk(lst[i].Member)
 
 			if withScores {
-				w.writeBulk(ledis.StrPutInt64(lst[i].Score))
+				w.writeBulk(num.FormatInt64ToSlice(lst[i].Score))
 			}
 		}
 	}
@@ -276,7 +280,7 @@ func (w *respWriter) writeScorePairArray(lst []ledis.ScorePair, withScores bool)
 
 func (w *respWriter) writeBulkFrom(n int64, rb io.Reader) {
 	w.buff.WriteByte('$')
-	w.buff.Write(ledis.Slice(strconv.FormatInt(n, 10)))
+	w.buff.Write(hack.Slice(strconv.FormatInt(n, 10)))
 	w.buff.Write(Delims)
 
 	io.Copy(w.buff, rb)

server/cmd_bit.go

@@ -1,6 +1,8 @@
 package server
 
 import (
+	"github.com/siddontang/go/hack"
+
 	"github.com/siddontang/ledisdb/ledis"
 	"strings"
 )
@@ -173,7 +175,7 @@ func boptCommand(c *client) error {
 		return ErrCmdParams
 	}
 
-	opDesc := strings.ToLower(ledis.String(args[0]))
+	opDesc := strings.ToLower(hack.String(args[0]))
 	dstKey := args[1]
 	srcKeys := args[2:]
 

server/cmd_kv.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"github.com/siddontang/go/hack"
 	"github.com/siddontang/ledisdb/ledis"
 	"strconv"
 	"strings"
@@ -292,26 +293,26 @@ func parseScanArgs(c *client) (key []byte, match string, count int, err error) {
 	}
 
 	if len(args) == 3 {
-		switch strings.ToLower(ledis.String(args[1])) {
+		switch strings.ToLower(hack.String(args[1])) {
 		case "match":
-			match = ledis.String(args[2])
+			match = hack.String(args[2])
 		case "count":
-			count, err = strconv.Atoi(ledis.String(args[2]))
+			count, err = strconv.Atoi(hack.String(args[2]))
 		default:
 			err = ErrCmdParams
 			return
 		}
 	} else if len(args) == 5 {
-		if strings.ToLower(ledis.String(args[1])) != "match" {
+		if strings.ToLower(hack.String(args[1])) != "match" {
 			err = ErrCmdParams
 			return
-		} else if strings.ToLower(ledis.String(args[3])) != "count" {
+		} else if strings.ToLower(hack.String(args[3])) != "count" {
 			err = ErrCmdParams
 			return
 		}
 
-		match = ledis.String(args[2])
+		match = hack.String(args[2])
-		count, err = strconv.Atoi(ledis.String(args[4]))
+		count, err = strconv.Atoi(hack.String(args[4]))
 	}
 
 	if count <= 0 {

server/cmd_replication.go

@@ -1,9 +1,8 @@
 package server
 
 import (
-	"encoding/binary"
 	"fmt"
-	"github.com/siddontang/go-snappy/snappy"
+	"github.com/siddontang/go/hack"
 	"github.com/siddontang/ledisdb/ledis"
 	"io/ioutil"
 	"os"
@@ -14,24 +13,32 @@ import (
 func slaveofCommand(c *client) error {
 	args := c.args
 
-	if len(args) != 2 {
+	if len(args) != 2 || len(args) != 3 {
 		return ErrCmdParams
 	}
 
 	masterAddr := ""
+	restart := false
 
-	if strings.ToLower(ledis.String(args[0])) == "no" &&
+	if strings.ToLower(hack.String(args[0])) == "no" &&
-		strings.ToLower(ledis.String(args[1])) == "one" {
+		strings.ToLower(hack.String(args[1])) == "one" {
 		//stop replication, use master = ""
+		if len(args) != 2 {
+			return ErrCmdParams
+		}
 	} else {
-		if _, err := strconv.ParseInt(ledis.String(args[1]), 10, 16); err != nil {
+		if _, err := strconv.ParseInt(hack.String(args[1]), 10, 16); err != nil {
 			return err
 		}
 
 		masterAddr = fmt.Sprintf("%s:%s", args[0], args[1])
+
+		if len(args) == 3 && strings.ToLower(hack.String(args[2])) == "restart" {
+			restart = true
+		}
 	}
 
-	if err := c.app.slaveof(masterAddr); err != nil {
+	if err := c.app.slaveof(masterAddr, restart); err != nil {
 		return err
 	}
 
@@ -66,55 +73,38 @@ func fullsyncCommand(c *client) error {
 	return nil
 }
 
-var reserveInfoSpace = make([]byte, 16)
-
 func syncCommand(c *client) error {
 	args := c.args
-	if len(args) != 2 {
+	if len(args) != 1 {
 		return ErrCmdParams
 	}
 
-	var logIndex int64
+	var logId uint64
-	var logPos int64
 	var err error
-	logIndex, err = ledis.StrInt64(args[0], nil)
+
-	if err != nil {
+	if logId, err = ledis.StrUint64(args[0], nil); err != nil {
 		return ErrCmdParams
 	}
 
-	logPos, err = ledis.StrInt64(args[1], nil)
+	c.lastLogID = logId - 1
-	if err != nil {
+
-		return ErrCmdParams
+	if c.ack != nil && logId > c.ack.id {
+		asyncNotifyUint64(c.ack.ch, logId)
+		c.ack = nil
 	}
 
 	c.syncBuf.Reset()
 
-	//reserve space to write binlog anchor
+	if _, _, err := c.app.ldb.ReadLogsToTimeout(logId, &c.syncBuf, 30); err != nil {
-	if _, err := c.syncBuf.Write(reserveInfoSpace); err != nil {
-		return err
-	}
-
-	m := &ledis.BinLogAnchor{logIndex, logPos}
-
-	if _, err := c.app.ldb.ReadEventsToTimeout(m, &c.syncBuf, 5); err != nil {
 		return err
 	} else {
 		buf := c.syncBuf.Bytes()
 
-		binary.BigEndian.PutUint64(buf[0:], uint64(m.LogFileIndex))
-		binary.BigEndian.PutUint64(buf[8:], uint64(m.LogPos))
-
-		if len(c.compressBuf) < snappy.MaxEncodedLen(len(buf)) {
-			c.compressBuf = make([]byte, snappy.MaxEncodedLen(len(buf)))
-		}
-
-		if buf, err = snappy.Encode(c.compressBuf, buf); err != nil {
-			return err
-		}
-
 		c.resp.writeBulk(buf)
 	}
 
+	c.app.addSlave(c)
+
 	return nil
 }
 

server/cmd_replication_test.go

@@ -1,25 +1,32 @@
 package server
 
 import (
-	"bytes"
 	"fmt"
 	"github.com/siddontang/ledisdb/config"
-	"github.com/siddontang/ledisdb/store"
 	"os"
+	"reflect"
 	"testing"
 	"time"
 )
 
 func checkDataEqual(master *App, slave *App) error {
-	it := master.ldb.DataDB().RangeLimitIterator(nil, nil, store.RangeClose, 0, -1)
+	mdb, _ := master.ldb.Select(0)
-	for ; it.Valid(); it.Next() {
+	sdb, _ := slave.ldb.Select(0)
-		key := it.Key()
-		value := it.Value()
 
-		if v, err := slave.ldb.DataDB().Get(key); err != nil {
+	mkeys, _ := mdb.Scan(nil, 100, true, "")
-			return err
+	skeys, _ := sdb.Scan(nil, 100, true, "")
-		} else if !bytes.Equal(v, value) {
+
-			return fmt.Errorf("replication error %d != %d", len(v), len(value))
+	if len(mkeys) != len(skeys) {
+		return fmt.Errorf("keys number not equal %d != %d", len(mkeys), len(skeys))
+	} else if !reflect.DeepEqual(mkeys, skeys) {
+		return fmt.Errorf("keys not equal")
+	} else {
+		for _, k := range mkeys {
+			v1, _ := mdb.Get(k)
+			v2, _ := sdb.Get(k)
+			if !reflect.DeepEqual(v1, v2) {
+				return fmt.Errorf("value not equal")
+			}
 		}
 	}
 
@@ -33,8 +40,9 @@ func TestReplication(t *testing.T) {
 	masterCfg := new(config.Config)
 	masterCfg.DataDir = fmt.Sprintf("%s/master", data_dir)
 	masterCfg.Addr = "127.0.0.1:11182"
-	masterCfg.BinLog.MaxFileSize = 1 * 1024 * 1024
+	masterCfg.UseReplication = true
-	masterCfg.BinLog.MaxFileNum = 10
+	masterCfg.Replication.Sync = true
+	masterCfg.Replication.WaitSyncTime = 5
 
 	var master *App
 	var slave *App
@@ -49,6 +57,7 @@ func TestReplication(t *testing.T) {
 	slaveCfg.DataDir = fmt.Sprintf("%s/slave", data_dir)
 	slaveCfg.Addr = "127.0.0.1:11183"
 	slaveCfg.SlaveOf = masterCfg.Addr
+	slaveCfg.UseReplication = true
 
 	slave, err = NewApp(slaveCfg)
 	if err != nil {
@@ -58,54 +67,67 @@ func TestReplication(t *testing.T) {
 
 	go master.Run()
 
+	time.Sleep(1 * time.Second)
+	go slave.Run()
+
 	db, _ := master.ldb.Select(0)
 
 	value := make([]byte, 10)
 
 	db.Set([]byte("a"), value)
 	db.Set([]byte("b"), value)
-	db.HSet([]byte("a"), []byte("1"), value)
+	db.Set([]byte("c"), value)
-	db.HSet([]byte("b"), []byte("2"), value)
+	db.Set([]byte("d"), value)
-
-	go slave.Run()
 
 	time.Sleep(1 * time.Second)
-
 	if err = checkDataEqual(master, slave); err != nil {
 		t.Fatal(err)
 	}
 
 	db.Set([]byte("a1"), value)
 	db.Set([]byte("b1"), value)
-	db.HSet([]byte("a1"), []byte("1"), value)
+	db.Set([]byte("c1"), value)
-	db.HSet([]byte("b1"), []byte("2"), value)
+	db.Set([]byte("d1"), value)
+
+	//time.Sleep(1 * time.Second)
+	slave.ldb.WaitReplication()
 
-	time.Sleep(1 * time.Second)
 	if err = checkDataEqual(master, slave); err != nil {
 		t.Fatal(err)
 	}
 
-	slave.slaveof("")
+	slave.slaveof("", false)
 
 	db.Set([]byte("a2"), value)
 	db.Set([]byte("b2"), value)
-	db.HSet([]byte("a2"), []byte("1"), value)
+	db.Set([]byte("c2"), value)
-	db.HSet([]byte("b2"), []byte("2"), value)
+	db.Set([]byte("d2"), value)
 
 	db.Set([]byte("a3"), value)
 	db.Set([]byte("b3"), value)
-	db.HSet([]byte("a3"), []byte("1"), value)
+	db.Set([]byte("c3"), value)
-	db.HSet([]byte("b3"), []byte("2"), value)
+	db.Set([]byte("d3"), value)
 
 	if err = checkDataEqual(master, slave); err == nil {
 		t.Fatal("must error")
 	}
 
-	slave.slaveof(masterCfg.Addr)
+	slave.slaveof(masterCfg.Addr, false)
+
 	time.Sleep(1 * time.Second)
 
 	if err = checkDataEqual(master, slave); err != nil {
 		t.Fatal(err)
 	}
 
+	slave.tryReSlaveof()
+
+	time.Sleep(1 * time.Second)
+
+	slave.ldb.WaitReplication()
+
+	if err = checkDataEqual(master, slave); err != nil {
+		t.Fatal(err)
+	}
+
 }

server/cmd_script.go

@@ -6,7 +6,8 @@ import (
 	"crypto/sha1"
 	"encoding/hex"
 	"fmt"
-	"github.com/siddontang/ledisdb/ledis"
+	"github.com/siddontang/go/hack"
+
 	"github.com/siddontang/ledisdb/lua"
 	"strconv"
 	"strings"
@@ -20,7 +21,7 @@ func parseEvalArgs(l *lua.State, c *client) error {
 
 	args = args[1:]
 
-	n, err := strconv.Atoi(ledis.String(args[0]))
+	n, err := strconv.Atoi(hack.String(args[0]))
 	if err != nil {
 		return err
 	}
@@ -72,7 +73,7 @@ func evalGenericCommand(c *client, evalSha1 bool) error {
 		h := sha1.Sum(c.args[0])
 		key = hex.EncodeToString(h[0:20])
 	} else {
-		key = strings.ToLower(ledis.String(c.args[0]))
+		key = strings.ToLower(hack.String(c.args[0]))
 	}
 
 	l.GetGlobal(key)
@@ -84,7 +85,7 @@ func evalGenericCommand(c *client, evalSha1 bool) error {
 			return fmt.Errorf("missing %s script", key)
 		}
 
-		if r := l.LoadString(ledis.String(c.args[0])); r != 0 {
+		if r := l.LoadString(hack.String(c.args[0])); r != 0 {
 			err := fmt.Errorf("%s", l.ToString(-1))
 			l.Pop(1)
 			return err
@@ -139,7 +140,7 @@ func scriptCommand(c *client) error {
 		return ErrCmdParams
 	}
 
-	switch strings.ToLower(ledis.String(args[0])) {
+	switch strings.ToLower(hack.String(args[0])) {
 	case "load":
 		return scriptLoadCommand(c)
 	case "exists":
@@ -164,7 +165,7 @@ func scriptLoadCommand(c *client) error {
 	h := sha1.Sum(c.args[1])
 	key := hex.EncodeToString(h[0:20])
 
-	if r := l.LoadString(ledis.String(c.args[1])); r != 0 {
+	if r := l.LoadString(hack.String(c.args[1])); r != 0 {
 		err := fmt.Errorf("%s", l.ToString(-1))
 		l.Pop(1)
 		return err
@@ -175,7 +176,7 @@ func scriptLoadCommand(c *client) error {
 		s.chunks[key] = struct{}{}
 	}
 
-	c.resp.writeBulk(ledis.Slice(key))
+	c.resp.writeBulk(hack.Slice(key))
 	return nil
 }
 
@@ -188,7 +189,7 @@ func scriptExistsCommand(c *client) error {
 
 	ay := make([]interface{}, len(c.args[1:]))
 	for i, n := range c.args[1:] {
-		if _, ok := s.chunks[ledis.String(n)]; ok {
+		if _, ok := s.chunks[hack.String(n)]; ok {
 			ay[i] = int64(1)
 		} else {
 			ay[i] = int64(0)

server/cmd_server.go

@@ -0,0 +1,95 @@
+package server
+
+import (
+	"github.com/siddontang/go/hack"
+	"strconv"
+	"strings"
+)
+
+func pingCommand(c *client) error {
+	c.resp.writeStatus(PONG)
+	return nil
+}
+
+func echoCommand(c *client) error {
+	if len(c.args) != 1 {
+		return ErrCmdParams
+	}
+
+	c.resp.writeBulk(c.args[0])
+	return nil
+}
+
+func selectCommand(c *client) error {
+	if len(c.args) != 1 {
+		return ErrCmdParams
+	}
+
+	if index, err := strconv.Atoi(hack.String(c.args[0])); err != nil {
+		return err
+	} else {
+		if c.db.IsInMulti() {
+			if err := c.script.Select(index); err != nil {
+				return err
+			} else {
+				c.db = c.script.DB
+			}
+		} else {
+			if db, err := c.ldb.Select(index); err != nil {
+				return err
+			} else {
+				c.db = db
+			}
+		}
+		c.resp.writeStatus(OK)
+	}
+
+	return nil
+}
+
+func infoCommand(c *client) error {
+	if len(c.args) > 1 {
+		return ErrCmdParams
+	}
+	var section string
+	if len(c.args) == 1 {
+		section = strings.ToLower(hack.String(c.args[0]))
+	}
+
+	buf := c.app.info.Dump(section)
+	c.resp.writeBulk(buf)
+
+	return nil
+}
+
+func flushallCommand(c *client) error {
+	err := c.ldb.FlushAll()
+	if err != nil {
+		return err
+	}
+
+	//we will restart the replication from master if possible
+	c.app.tryReSlaveof()
+
+	c.resp.writeStatus(OK)
+	return nil
+}
+
+func flushdbCommand(c *client) error {
+	_, err := c.db.FlushAll()
+	if err != nil {
+		return err
+	}
+
+	c.resp.writeStatus(OK)
+	return nil
+}
+
+func init() {
+	register("ping", pingCommand)
+	register("echo", echoCommand)
+	register("select", selectCommand)
+	register("info", infoCommand)
+	register("flushall", flushallCommand)
+	register("flushdb", flushdbCommand)
+}

server/cmd_zset.go

@@ -2,7 +2,10 @@ package server
 
 import (
 	"errors"
+	"github.com/siddontang/go/hack"
+	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/ledis"
+	"github.com/siddontang/ledisdb/store"
 	"math"
 	"strconv"
 	"strings"
@@ -73,7 +76,7 @@ func zscoreCommand(c *client) error {
 			return err
 		}
 	} else {
-		c.resp.writeBulk(ledis.StrPutInt64(s))
+		c.resp.writeBulk(num.FormatInt64ToSlice(s))
 	}
 
 	return nil
@@ -110,14 +113,14 @@ func zincrbyCommand(c *client) error {
 	v, err := c.db.ZIncrBy(key, delta, args[2])
 
 	if err == nil {
-		c.resp.writeBulk(ledis.StrPutInt64(v))
+		c.resp.writeBulk(num.FormatInt64ToSlice(v))
 	}
 
 	return err
 }
 
 func zparseScoreRange(minBuf []byte, maxBuf []byte) (min int64, max int64, err error) {
-	if strings.ToLower(ledis.String(minBuf)) == "-inf" {
+	if strings.ToLower(hack.String(minBuf)) == "-inf" {
 		min = math.MinInt64
 	} else {
 
@@ -148,7 +151,7 @@ func zparseScoreRange(minBuf []byte, maxBuf []byte) (min int64, max int64, err e
 		}
 	}
 
-	if strings.ToLower(ledis.String(maxBuf)) == "+inf" {
+	if strings.ToLower(hack.String(maxBuf)) == "+inf" {
 		max = math.MaxInt64
 	} else {
 		var ropen = false
@@ -289,11 +292,11 @@ func zremrangebyscoreCommand(c *client) error {
 }
 
 func zparseRange(c *client, a1 []byte, a2 []byte) (start int, stop int, err error) {
-	if start, err = strconv.Atoi(ledis.String(a1)); err != nil {
+	if start, err = strconv.Atoi(hack.String(a1)); err != nil {
 		return
 	}
 
-	if stop, err = strconv.Atoi(ledis.String(a2)); err != nil {
+	if stop, err = strconv.Atoi(hack.String(a2)); err != nil {
 		return
 	}
 
@@ -320,7 +323,7 @@ func zrangeGeneric(c *client, reverse bool) error {
 		if len(args) != 1 {
 			return ErrCmdParams
 		}
-		if strings.ToLower(ledis.String(args[0])) == "withscores" {
+		if strings.ToLower(hack.String(args[0])) == "withscores" {
 			withScores = true
 		} else {
 			return ErrSyntax
@@ -370,7 +373,7 @@ func zrangebyscoreGeneric(c *client, reverse bool) error {
 	var withScores bool = false
 
 	if len(args) > 0 {
-		if strings.ToLower(ledis.String(args[0])) == "withscores" {
+		if strings.ToLower(hack.String(args[0])) == "withscores" {
 			withScores = true
 			args = args[1:]
 		}
@@ -384,15 +387,15 @@ func zrangebyscoreGeneric(c *client, reverse bool) error {
 			return ErrCmdParams
 		}
 
-		if strings.ToLower(ledis.String(args[0])) != "limit" {
+		if strings.ToLower(hack.String(args[0])) != "limit" {
 			return ErrSyntax
 		}
 
-		if offset, err = strconv.Atoi(ledis.String(args[1])); err != nil {
+		if offset, err = strconv.Atoi(hack.String(args[1])); err != nil {
 			return ErrValue
 		}
 
-		if count, err = strconv.Atoi(ledis.String(args[2])); err != nil {
+		if count, err = strconv.Atoi(hack.String(args[2])); err != nil {
 			return ErrValue
 		}
 	}
@@ -523,7 +526,7 @@ func zpersistCommand(c *client) error {
 
 func zparseZsetoptStore(args [][]byte) (destKey []byte, srcKeys [][]byte, weights []int64, aggregate byte, err error) {
 	destKey = args[0]
-	nKeys, err := strconv.Atoi(ledis.String(args[1]))
+	nKeys, err := strconv.Atoi(hack.String(args[1]))
 	if err != nil {
 		err = ErrValue
 		return
@@ -542,7 +545,7 @@ func zparseZsetoptStore(args [][]byte) (destKey []byte, srcKeys [][]byte, weight
 	var aggregateFlag = false
 
 	for len(args) > 0 {
-		if strings.ToLower(ledis.String(args[0])) == "weights" {
+		if strings.ToLower(hack.String(args[0])) == "weights" {
 			if weightsFlag {
 				err = ErrSyntax
 				return
@@ -565,7 +568,7 @@ func zparseZsetoptStore(args [][]byte) (destKey []byte, srcKeys [][]byte, weight
 
 			weightsFlag = true
 
-		} else if strings.ToLower(ledis.String(args[0])) == "aggregate" {
+		} else if strings.ToLower(hack.String(args[0])) == "aggregate" {
 			if aggregateFlag {
 				err = ErrSyntax
 				return
@@ -575,11 +578,11 @@ func zparseZsetoptStore(args [][]byte) (destKey []byte, srcKeys [][]byte, weight
 				return
 			}
 
-			if strings.ToLower(ledis.String(args[1])) == "sum" {
+			if strings.ToLower(hack.String(args[1])) == "sum" {
 				aggregate = ledis.AggregateSum
-			} else if strings.ToLower(ledis.String(args[1])) == "min" {
+			} else if strings.ToLower(hack.String(args[1])) == "min" {
 				aggregate = ledis.AggregateMin
-			} else if strings.ToLower(ledis.String(args[1])) == "max" {
+			} else if strings.ToLower(hack.String(args[1])) == "max" {
 				aggregate = ledis.AggregateMax
 			} else {
 				err = ErrSyntax
@@ -659,6 +662,128 @@ func zxscanCommand(c *client) error {
 	return nil
 }
 
+func zparseMemberRange(minBuf []byte, maxBuf []byte) (min []byte, max []byte, rangeType uint8, err error) {
+	rangeType = store.RangeClose
+	if strings.ToLower(hack.String(minBuf)) == "-" {
+		min = nil
+	} else {
+		if len(minBuf) == 0 {
+			err = ErrCmdParams
+			return
+		}
+
+		if minBuf[0] == '(' {
+			rangeType |= store.RangeLOpen
+			min = minBuf[1:]
+		} else if minBuf[0] == '[' {
+			min = minBuf[1:]
+		} else {
+			err = ErrCmdParams
+			return
+		}
+	}
+
+	if strings.ToLower(hack.String(maxBuf)) == "+" {
+		max = nil
+	} else {
+		if len(maxBuf) == 0 {
+			err = ErrCmdParams
+			return
+		}
+		if maxBuf[0] == '(' {
+			rangeType |= store.RangeROpen
+			max = maxBuf[1:]
+		} else if maxBuf[0] == '[' {
+			max = maxBuf[1:]
+		} else {
+			err = ErrCmdParams
+			return
+		}
+	}
+
+	return
+}
+
+func zrangebylexCommand(c *client) error {
+	args := c.args
+	if len(args) != 3 && len(args) != 6 {
+		return ErrCmdParams
+	}
+
+	min, max, rangeType, err := zparseMemberRange(args[1], args[2])
+	if err != nil {
+		return err
+	}
+
+	var offset int = 0
+	var count int = -1
+
+	if len(args) == 6 {
+		if strings.ToLower(hack.String(args[3])) != "limit" {
+			return ErrSyntax
+		}
+
+		if offset, err = strconv.Atoi(hack.String(args[4])); err != nil {
+			return ErrValue
+		}
+
+		if count, err = strconv.Atoi(hack.String(args[5])); err != nil {
+			return ErrValue
+		}
+	}
+
+	key := args[0]
+	if ay, err := c.db.ZRangeByLex(key, min, max, rangeType, offset, count); err != nil {
+		return err
+	} else {
+		c.resp.writeSliceArray(ay)
+	}
+
+	return nil
+}
+
+func zremrangebylexCommand(c *client) error {
+	args := c.args
+	if len(args) != 3 {
+		return ErrCmdParams
+	}
+
+	min, max, rangeType, err := zparseMemberRange(args[1], args[2])
+	if err != nil {
+		return err
+	}
+
+	key := args[0]
+	if n, err := c.db.ZRemRangeByLex(key, min, max, rangeType); err != nil {
+		return err
+	} else {
+		c.resp.writeInteger(n)
+	}
+
+	return nil
+}
+
+func zlexcountCommand(c *client) error {
+	args := c.args
+	if len(args) != 3 {
+		return ErrCmdParams
+	}
+
+	min, max, rangeType, err := zparseMemberRange(args[1], args[2])
+	if err != nil {
+		return err
+	}
+
+	key := args[0]
+	if n, err := c.db.ZLexCount(key, min, max, rangeType); err != nil {
+		return err
+	} else {
+		c.resp.writeInteger(n)
+	}
+
+	return nil
+}
+
 func init() {
 	register("zadd", zaddCommand)
 	register("zcard", zcardCommand)
@@ -678,6 +803,10 @@ func init() {
 	register("zunionstore", zunionstoreCommand)
 	register("zinterstore", zinterstoreCommand)
 
+	register("zrangebylex", zrangebylexCommand)
+	register("zremrangebylex", zremrangebylexCommand)
+	register("zlexcount", zlexcountCommand)
+
 	//ledisdb special command
 
 	register("zclear", zclearCommand)

server/cmd_zset_test.go

@@ -3,6 +3,7 @@ package server
 import (
 	"fmt"
 	"github.com/siddontang/ledisdb/client/go/ledis"
+	"reflect"
 	"strconv"
 	"testing"
 )
@@ -737,3 +738,51 @@ func TestZInterStore(t *testing.T) {
 		}
 	}
 }
+
+func TestZSetLex(t *testing.T) {
+	c := getTestConn()
+	defer c.Close()
+
+	key := []byte("myzlexset")
+	if _, err := c.Do("zadd", key,
+		0, "a", 0, "b", 0, "c", 0, "d", 0, "e", 0, "f", 0, "g"); err != nil {
+		t.Fatal(err)
+	}
+
+	if ay, err := ledis.Strings(c.Do("zrangebylex", key, "-", "[c")); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, []string{"a", "b", "c"}) {
+		t.Fatal("must equal")
+	}
+
+	if ay, err := ledis.Strings(c.Do("zrangebylex", key, "-", "(c")); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, []string{"a", "b"}) {
+		t.Fatal("must equal")
+	}
+
+	if ay, err := ledis.Strings(c.Do("zrangebylex", key, "[aaa", "(g")); err != nil {
+		t.Fatal(err)
+	} else if !reflect.DeepEqual(ay, []string{"b", "c", "d", "e", "f"}) {
+		t.Fatal("must equal")
+	}
+
+	if n, err := ledis.Int64(c.Do("zlexcount", key, "-", "(c")); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+	if n, err := ledis.Int64(c.Do("zremrangebylex", key, "[aaa", "(g")); err != nil {
+		t.Fatal(err)
+	} else if n != 5 {
+		t.Fatal(n)
+	}
+
+	if n, err := ledis.Int64(c.Do("zlexcount", key, "-", "+")); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+}

server/command.go

@@ -2,8 +2,6 @@ package server
 
 import (
 	"fmt"
-	"github.com/siddontang/ledisdb/ledis"
-	"strconv"
 	"strings"
 )
 
@@ -18,94 +16,3 @@ func register(name string, f CommandFunc) {
 
 	regCmds[name] = f
 }
-
-func pingCommand(c *client) error {
-	c.resp.writeStatus(PONG)
-	return nil
-}
-
-func echoCommand(c *client) error {
-	if len(c.args) != 1 {
-		return ErrCmdParams
-	}
-
-	c.resp.writeBulk(c.args[0])
-	return nil
-}
-
-func selectCommand(c *client) error {
-	if len(c.args) != 1 {
-		return ErrCmdParams
-	}
-
-	if index, err := strconv.Atoi(ledis.String(c.args[0])); err != nil {
-		return err
-	} else {
-		if c.db.IsTransaction() {
-			if err := c.tx.Select(index); err != nil {
-				return err
-			} else {
-				c.db = c.tx.DB
-			}
-		} else if c.db.IsInMulti() {
-			if err := c.script.Select(index); err != nil {
-				return err
-			} else {
-				c.db = c.script.DB
-			}
-		} else {
-			if db, err := c.ldb.Select(index); err != nil {
-				return err
-			} else {
-				c.db = db
-			}
-		}
-		c.resp.writeStatus(OK)
-	}
-
-	return nil
-}
-
-func infoCommand(c *client) error {
-	if len(c.args) > 1 {
-		return ErrSyntax
-	}
-	var section string
-	if len(c.args) == 1 {
-		section = strings.ToLower(ledis.String(c.args[0]))
-	}
-
-	buf := c.app.info.Dump(section)
-	c.resp.writeBulk(buf)
-
-	return nil
-}
-
-func flushallCommand(c *client) error {
-	err := c.ldb.FlushAll()
-	if err != nil {
-		return err
-	}
-
-	c.resp.writeStatus(OK)
-	return nil
-}
-
-func flushdbCommand(c *client) error {
-	_, err := c.db.FlushAll()
-	if err != nil {
-		return err
-	}
-
-	c.resp.writeStatus(OK)
-	return nil
-}
-
-func init() {
-	register("ping", pingCommand)
-	register("echo", echoCommand)
-	register("select", selectCommand)
-	register("info", infoCommand)
-	register("flushall", flushallCommand)
-	register("flushdb", flushdbCommand)
-}

server/doc.go

@@ -24,7 +24,8 @@
 //  ledis-cli -p 6381
 //  ledis 127.0.0.1:6381 > slaveof 127.0.0.1 6380
 //
-// After you send slaveof command, the slave will start to sync master's binlog and replicate from binlog.
+// After you send slaveof command, the slave will start to sync master's write ahead log and replicate from it.
+// You must notice that use_replication must be set true if you want to use it.
 //
 // HTTP Interface
 //

server/info.go

@@ -81,6 +81,8 @@ func (i *info) Dump(section string) []byte {
 		i.dumpPersistence(buf)
 	case "goroutine":
 		i.dumpGoroutine(buf)
+	case "replication":
+		i.dumpReplication(buf)
 	default:
 		buf.WriteString(fmt.Sprintf("# %s\r\n", section))
 	}
@@ -103,6 +105,8 @@ func (i *info) dumpAll(buf *bytes.Buffer) {
 	i.dumpMem(buf)
 	buf.Write(Delims)
 	i.dumpGoroutine(buf)
+	buf.Write(Delims)
+	i.dumpReplication(buf)
 }
 
 func (i *info) dumpServer(buf *bytes.Buffer) {
@@ -142,6 +146,29 @@ func (i *info) dumpPersistence(buf *bytes.Buffer) {
 	i.dumpPairs(buf, infoPair{"db_name", i.Persistence.DBName})
 }
 
+func (i *info) dumpReplication(buf *bytes.Buffer) {
+	buf.WriteString("# Replication\r\n")
+
+	p := []infoPair{}
+	slaves := make([]string, 0, len(i.app.slaves))
+	for s, _ := range i.app.slaves {
+		slaves = append(slaves, s.remoteAddr)
+	}
+
+	p = append(p, infoPair{"readonly", i.app.ldb.IsReadOnly()})
+
+	if len(slaves) > 0 {
+		p = append(p, infoPair{"slave", strings.Join(slaves, ",")})
+	}
+
+	s, _ := i.app.ldb.ReplicationStat()
+	p = append(p, infoPair{"last_log_id", s.LastID})
+	p = append(p, infoPair{"first_log_id", s.FirstID})
+	p = append(p, infoPair{"commit_log_id", s.CommitID})
+
+	i.dumpPairs(buf, p...)
+}
+
 func (i *info) dumpPairs(buf *bytes.Buffer, pairs ...infoPair) {
 	for _, v := range pairs {
 		buf.WriteString(fmt.Sprintf("%s:%v\r\n", v.Key, v.Value))

server/replication.go

@@ -3,14 +3,13 @@ package server
 import (
 	"bufio"
 	"bytes"
-	"encoding/binary"
-	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/siddontang/go-log/log"
+	"github.com/siddontang/go/hack"
-	"github.com/siddontang/go-snappy/snappy"
+	"github.com/siddontang/go/log"
+	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/ledis"
-	"io/ioutil"
+	"github.com/siddontang/ledisdb/rpl"
 	"net"
 	"os"
 	"path"
@@ -23,52 +22,6 @@ var (
 	errConnectMaster = errors.New("connect master error")
 )
 
-type MasterInfo struct {
-	Addr         string `json:"addr"`
-	LogFileIndex int64  `json:"log_file_index"`
-	LogPos       int64  `json:"log_pos"`
-}
-
-func (m *MasterInfo) Save(filePath string) error {
-	data, err := json.Marshal(m)
-	if err != nil {
-		return err
-	}
-
-	filePathBak := fmt.Sprintf("%s.bak", filePath)
-
-	var fd *os.File
-	fd, err = os.OpenFile(filePathBak, os.O_CREATE|os.O_WRONLY, 0644)
-	if err != nil {
-		return err
-	}
-
-	if _, err = fd.Write(data); err != nil {
-		fd.Close()
-		return err
-	}
-
-	fd.Close()
-	return os.Rename(filePathBak, filePath)
-}
-
-func (m *MasterInfo) Load(filePath string) error {
-	data, err := ioutil.ReadFile(filePath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return nil
-		} else {
-			return err
-		}
-	}
-
-	if err = json.Unmarshal(data, m); err != nil {
-		return err
-	}
-
-	return nil
-}
-
 type master struct {
 	sync.Mutex
 
@@ -79,40 +32,24 @@ type master struct {
 
 	quit chan struct{}
 
-	infoName string
+	addr string
-
-	info *MasterInfo
 
 	wg sync.WaitGroup
 
 	syncBuf bytes.Buffer
-
-	compressBuf []byte
 }
 
 func newMaster(app *App) *master {
 	m := new(master)
 	m.app = app
 
-	m.infoName = path.Join(m.app.cfg.DataDir, "master.info")
-
 	m.quit = make(chan struct{}, 1)
 
-	m.compressBuf = make([]byte, 256)
-
-	m.info = new(MasterInfo)
-
-	//if load error, we will start a fullsync later
-	m.loadInfo()
-
 	return m
 }
 
 func (m *master) Close() {
-	select {
+	ledis.AsyncNotify(m.quit)
-	case m.quit <- struct{}{}:
-	default:
-	}
 
 	if m.conn != nil {
 		m.conn.Close()
@@ -122,16 +59,8 @@ func (m *master) Close() {
 	m.wg.Wait()
 }
 
-func (m *master) loadInfo() error {
-	return m.info.Load(m.infoName)
-}
-
-func (m *master) saveInfo() error {
-	return m.info.Save(m.infoName)
-}
-
 func (m *master) connect() error {
-	if len(m.info.Addr) == 0 {
+	if len(m.addr) == 0 {
 		return fmt.Errorf("no assign master addr")
 	}
 
@@ -140,7 +69,7 @@ func (m *master) connect() error {
 		m.conn = nil
 	}
 
-	if conn, err := net.Dial("tcp", m.info.Addr); err != nil {
+	if conn, err := net.Dial("tcp", m.addr); err != nil {
 		return err
 	} else {
 		m.conn = conn
@@ -150,43 +79,28 @@ func (m *master) connect() error {
 	return nil
 }
 
-func (m *master) resetInfo(addr string) {
-	m.info.Addr = addr
-	m.info.LogFileIndex = 0
-	m.info.LogPos = 0
-}
-
 func (m *master) stopReplication() error {
 	m.Close()
 
-	if err := m.saveInfo(); err != nil {
-		log.Error("save master info error %s", err.Error())
-		return err
-	}
-
 	return nil
 }
 
-func (m *master) startReplication(masterAddr string) error {
+func (m *master) startReplication(masterAddr string, restart bool) error {
 	//stop last replcation, if avaliable
 	m.Close()
 
-	if masterAddr != m.info.Addr {
+	m.addr = masterAddr
-		m.resetInfo(masterAddr)
-		if err := m.saveInfo(); err != nil {
-			log.Error("save master info error %s", err.Error())
-			return err
-		}
-	}
 
 	m.quit = make(chan struct{}, 1)
 
-	go m.runReplication()
+	m.app.ldb.SetReadOnly(true)
+
+	m.wg.Add(1)
+	go m.runReplication(restart)
 	return nil
 }
 
-func (m *master) runReplication() {
+func (m *master) runReplication(restart bool) {
-	m.wg.Add(1)
 	defer m.wg.Done()
 
 	for {
@@ -195,34 +109,27 @@ func (m *master) runReplication() {
 			return
 		default:
 			if err := m.connect(); err != nil {
-				log.Error("connect master %s error %s, try 2s later", m.info.Addr, err.Error())
+				log.Error("connect master %s error %s, try 2s later", m.addr, err.Error())
 				time.Sleep(2 * time.Second)
 				continue
 			}
 		}
 
-		if m.info.LogFileIndex == 0 {
+		if restart {
-			//try a fullsync
 			if err := m.fullSync(); err != nil {
 				if m.conn != nil {
 					//if conn == nil, other close the replication, not error
-					log.Warn("full sync error %s", err.Error())
+					log.Error("restart fullsync error %s", err.Error())
 				}
 				return
 			}
-
-			if m.info.LogFileIndex == 0 {
-				//master not support binlog, we cannot sync, so stop replication
-				m.stopReplication()
-				return
-			}
 		}
 
 		for {
 			if err := m.sync(); err != nil {
 				if m.conn != nil {
 					//if conn == nil, other close the replication, not error
-					log.Warn("sync error %s", err.Error())
+					log.Error("sync error %s", err.Error())
 				}
 				return
 			}
@@ -241,10 +148,12 @@ func (m *master) runReplication() {
 
 var (
 	fullSyncCmd   = []byte("*1\r\n$8\r\nfullsync\r\n")  //fullsync
-	syncCmdFormat = "*3\r\n$4\r\nsync\r\n$%d\r\n%s\r\n$%d\r\n%s\r\n" //sync index pos
+	syncCmdFormat = "*2\r\n$4\r\nsync\r\n$%d\r\n%s\r\n" //sync logid
 )
 
 func (m *master) fullSync() error {
+	log.Info("begin full sync")
+
 	if _, err := m.conn.Write(fullSyncCmd); err != nil {
 		return err
 	}
@@ -264,30 +173,38 @@ func (m *master) fullSync() error {
 		return err
 	}
 
-	if err = m.app.ldb.FlushAll(); err != nil {
+	if _, err = m.app.ldb.LoadDumpFile(dumpPath); err != nil {
-		return err
-	}
-
-	var head *ledis.BinLogAnchor
-	head, err = m.app.ldb.LoadDumpFile(dumpPath)
-
-	if err != nil {
 		log.Error("load dump file error %s", err.Error())
 		return err
 	}
 
-	m.info.LogFileIndex = head.LogFileIndex
+	return nil
-	m.info.LogPos = head.LogPos
+}
 
-	return m.saveInfo()
+func (m *master) nextSyncLogID() (uint64, error) {
+	s, err := m.app.ldb.ReplicationStat()
+	if err != nil {
+		return 0, err
+	}
+
+	if s.LastID > s.CommitID {
+		return s.LastID + 1, nil
+	} else {
+		return s.CommitID + 1, nil
+	}
 }
 
 func (m *master) sync() error {
-	logIndexStr := strconv.FormatInt(m.info.LogFileIndex, 10)
+	var err error
-	logPosStr := strconv.FormatInt(m.info.LogPos, 10)
+	var syncID uint64
+	if syncID, err = m.nextSyncLogID(); err != nil {
+		return err
+	}
 
-	cmd := ledis.Slice(fmt.Sprintf(syncCmdFormat, len(logIndexStr),
+	logIDStr := strconv.FormatUint(syncID, 10)
-		logIndexStr, len(logPosStr), logPosStr))
+
+	cmd := hack.Slice(fmt.Sprintf(syncCmdFormat, len(logIDStr),
+		logIDStr))
 
 	if _, err := m.conn.Write(cmd); err != nil {
 		return err
@@ -295,53 +212,152 @@ func (m *master) sync() error {
 
 	m.syncBuf.Reset()
 
-	err := ReadBulkTo(m.rb, &m.syncBuf)
+	if err = ReadBulkTo(m.rb, &m.syncBuf); err != nil {
-	if err != nil {
+		switch err.Error() {
-		return err
+		case ledis.ErrLogMissed.Error():
-	}
+			return m.fullSync()
-
+		case ledis.ErrRplNotSupport.Error():
-	var buf []byte
-	buf, err = snappy.Decode(m.compressBuf, m.syncBuf.Bytes())
-	if err != nil {
-		return err
-	} else if len(buf) > len(m.compressBuf) {
-		m.compressBuf = buf
-	}
-
-	if len(buf) < 16 {
-		return fmt.Errorf("invalid sync data len %d", len(buf))
-	}
-
-	m.info.LogFileIndex = int64(binary.BigEndian.Uint64(buf[0:8]))
-	m.info.LogPos = int64(binary.BigEndian.Uint64(buf[8:16]))
-
-	if m.info.LogFileIndex == 0 {
-		//master now not support binlog, stop replication
 			m.stopReplication()
 			return nil
-	} else if m.info.LogFileIndex == -1 {
+		default:
-		//-1 means than binlog index and pos are lost, we must start a full sync instead
+			return err
-		return m.fullSync()
+		}
 	}
 
-	err = m.app.ldb.ReplicateFromData(buf[16:])
+	buf := m.syncBuf.Bytes()
-	if err != nil {
+
+	if len(buf) == 0 {
+		return nil
+	}
+
+	if err = m.app.ldb.StoreLogsFromData(buf); err != nil {
 		return err
 	}
 
-	return m.saveInfo()
+	return nil
 
 }
 
-func (app *App) slaveof(masterAddr string) error {
+func (app *App) slaveof(masterAddr string, restart bool) error {
 	app.m.Lock()
 	defer app.m.Unlock()
 
+	if !app.ldb.ReplicationUsed() {
+		return fmt.Errorf("slaveof must enable replication")
+	}
+
+	app.cfg.SlaveOf = masterAddr
+
 	if len(masterAddr) == 0 {
-		return app.m.stopReplication()
+		if err := app.m.stopReplication(); err != nil {
+			return err
+		}
+
+		app.ldb.SetReadOnly(false)
 	} else {
-		return app.m.startReplication(masterAddr)
+		return app.m.startReplication(masterAddr, restart)
 	}
 
 	return nil
 }
+
+func (app *App) tryReSlaveof() error {
+	app.m.Lock()
+	defer app.m.Unlock()
+
+	if !app.ldb.ReplicationUsed() {
+		return nil
+	}
+
+	if len(app.cfg.SlaveOf) == 0 {
+		return nil
+	} else {
+		return app.m.startReplication(app.cfg.SlaveOf, true)
+	}
+}
+
+func (app *App) addSlave(c *client) {
+	app.slock.Lock()
+	defer app.slock.Unlock()
+
+	app.slaves[c] = struct{}{}
+}
+
+func (app *App) removeSlave(c *client) {
+	app.slock.Lock()
+	defer app.slock.Unlock()
+
+	delete(app.slaves, c)
+
+	if c.ack != nil {
+		asyncNotifyUint64(c.ack.ch, c.lastLogID)
+	}
+}
+
+func asyncNotifyUint64(ch chan uint64, v uint64) {
+	select {
+	case ch <- v:
+	default:
+	}
+}
+
+func (app *App) publishNewLog(l *rpl.Log) {
+	if !app.cfg.Replication.Sync {
+		//no sync replication, we will do async
+		return
+	}
+
+	ss := make([]*client, 0, 4)
+	app.slock.Lock()
+
+	logId := l.ID
+	for s, _ := range app.slaves {
+		if s.lastLogID >= logId {
+			//slave has already this log
+			ss = []*client{}
+			break
+		} else {
+			ss = append(ss, s)
+		}
+	}
+
+	app.slock.Unlock()
+
+	if len(ss) == 0 {
+		return
+	}
+
+	ack := &syncAck{
+		logId, make(chan uint64, len(ss)),
+	}
+
+	for _, s := range ss {
+		s.ack = ack
+	}
+
+	total := (len(ss) + 1) / 2
+	if app.cfg.Replication.WaitMaxSlaveAcks > 0 {
+		total = num.MinInt(total, app.cfg.Replication.WaitMaxSlaveAcks)
+	}
+
+	done := make(chan struct{}, 1)
+	go func(total int) {
+		n := 0
+		for i := 0; i < len(ss); i++ {
+			id := <-ack.ch
+			if id > logId {
+				n++
+				if n >= total {
+					break
+				}
+			}
+		}
+		done <- struct{}{}
+	}(total)
+
+	select {
+	case <-done:
+	case <-time.After(time.Duration(app.cfg.Replication.WaitSyncTime) * time.Second):
+		log.Info("replication wait timeout")
+	}
+}

server/script.go

@@ -5,6 +5,8 @@ package server
 import (
 	"encoding/hex"
 	"fmt"
+	"github.com/siddontang/go/hack"
+	"github.com/siddontang/go/num"
 	"github.com/siddontang/ledisdb/ledis"
 	"github.com/siddontang/ledisdb/lua"
 	"io"
@@ -38,7 +40,7 @@ func (w *luaWriter) writeBulk(b []byte) {
 	if b == nil {
 		w.l.PushBoolean(false)
 	} else {
-		w.l.PushString(ledis.String(b))
+		w.l.PushString(hack.String(b))
 	}
 }
 
@@ -81,7 +83,7 @@ func (w *luaWriter) writeSliceArray(lst [][]byte) {
 
 	w.l.CreateTable(len(lst), 0)
 	for i, v := range lst {
-		w.l.PushString(ledis.String(v))
+		w.l.PushString(hack.String(v))
 		w.l.RawSeti(-2, i+1)
 	}
 }
@@ -94,10 +96,10 @@ func (w *luaWriter) writeFVPairArray(lst []ledis.FVPair) {
 
 	w.l.CreateTable(len(lst)*2, 0)
 	for i, v := range lst {
-		w.l.PushString(ledis.String(v.Field))
+		w.l.PushString(hack.String(v.Field))
 		w.l.RawSeti(-2, 2*i+1)
 
-		w.l.PushString(ledis.String(v.Value))
+		w.l.PushString(hack.String(v.Value))
 		w.l.RawSeti(-2, 2*i+2)
 	}
 }
@@ -111,16 +113,16 @@ func (w *luaWriter) writeScorePairArray(lst []ledis.ScorePair, withScores bool)
 	if withScores {
 		w.l.CreateTable(len(lst)*2, 0)
 		for i, v := range lst {
-			w.l.PushString(ledis.String(v.Member))
+			w.l.PushString(hack.String(v.Member))
 			w.l.RawSeti(-2, 2*i+1)
 
-			w.l.PushString(ledis.String(ledis.StrPutInt64(v.Score)))
+			w.l.PushString(hack.String(num.FormatInt64ToSlice(v.Score)))
 			w.l.RawSeti(-2, 2*i+2)
 		}
 	} else {
 		w.l.CreateTable(len(lst), 0)
 		for i, v := range lst {
-			w.l.PushString(ledis.String(v.Member))
+			w.l.PushString(hack.String(v.Member))
 			w.l.RawSeti(-2, i+1)
 		}
 	}
@@ -280,7 +282,7 @@ func luaSha1Hex(l *lua.State) int {
 	}
 
 	s := l.ToString(1)
-	s = hex.EncodeToString(ledis.Slice(s))
+	s = hex.EncodeToString(hack.Slice(s))
 
 	l.PushString(s)
 	return 1
@@ -333,7 +335,7 @@ func luaSetGlobalArray(l *lua.State, name string, ay [][]byte) {
 	l.NewTable()
 
 	for i := 0; i < len(ay); i++ {
-		l.PushString(ledis.String(ay[i]))
+		l.PushString(hack.String(ay[i]))
 		l.RawSeti(-2, i+1)
 	}
 
@@ -348,7 +350,7 @@ func luaReplyToLedisReply(l *lua.State) interface{} {
 
 	switch l.Type(-1) {
 	case lua.LUA_TSTRING:
-		return ledis.Slice(l.ToString(-1))
+		return hack.Slice(l.ToString(-1))
 	case lua.LUA_TBOOLEAN:
 		if l.ToBoolean(-1) {
 			return int64(1)

server/util.go

@@ -3,7 +3,7 @@ package server
 import (
 	"bufio"
 	"errors"
-	"github.com/siddontang/ledisdb/ledis"
+	"github.com/siddontang/go/hack"
 	"io"
 	"strconv"
 )
@@ -36,7 +36,7 @@ func ReadBulkTo(rb *bufio.Reader, w io.Writer) error {
 	} else if l[0] == '$' {
 		var n int
 		//handle resp string
-		if n, err = strconv.Atoi(ledis.String(l[1:])); err != nil {
+		if n, err = strconv.Atoi(hack.String(l[1:])); err != nil {
 			return err
 		} else if n == -1 {
 			return nil

store/store.go

@@ -16,7 +16,11 @@ import (
 )
 
 func getStorePath(cfg *config.Config) string {
+	if len(cfg.DBPath) > 0 {
+		return cfg.DBPath
+	} else {
 		return path.Join(cfg.DataDir, fmt.Sprintf("%s_data", cfg.DBName))
+	}
 }
 
 func Open(cfg *config.Config) (*DB, error) {

tools/build_config.sh

@@ -13,6 +13,14 @@ touch $OUTPUT
 
 source ./dev.sh
 
+# Test godep install
+godep path > /dev/null 2>&1
+if [ "$?" = 0 ]; then
+    echo "GO=godep go" >> $OUTPUT
+else
+    echo "GO=go" >> $OUTPUT
+fi
+
 echo "CGO_CFLAGS=$CGO_CFLAGS" >> $OUTPUT
 echo "CGO_CXXFLAGS=$CGO_CXXFLAGS" >> $OUTPUT
 echo "CGO_LDFLAGS=$CGO_LDFLAGS" >> $OUTPUT