multi: Improve API.

README.md

@@ -131,6 +131,22 @@ Multi/Exec
 
 Example:
 
+    func transaction(multi *redis.MultiClient) ([]redis.Req, error) {
+        get := multiClient.Get("foo")
+        if get.Err() != nil {
+            panic(get.Err())
+        }
+
+        reqs, err = multiClient.Exec(func() {
+            multi.Set("foo", get.Val() + "1")
+        })
+        if err == redis.Nil {
+            return transaction()
+        }
+
+        return reqs, err
+    }
+
     multiClient, err := redisClient.MultiClient()
     if err != nil {
         panic(err)
@@ -142,29 +158,14 @@ Example:
         panic(watch.Err())
     }
 
-    get := multiClient.Get("foo")
+    reqs, err := transaction(multiClient)
-    if get.Err() != nil {
+    if err != nil {
-        panic(get.Err())
-    }
-
-    // Start transaction.
-    multiClient.Multi()
-
-    set := multiClient.Set("foo", get.Val() + "1")
-
-    // Commit transaction.
-    reqs, err := multiClient.Exec()
-    if err == redis.Nil {
-        // Repeat transaction.
-    } else if err != nil {
         panic(err)
     }
     for _, req := range reqs {
         // ...
     }
 
-    ok := set.Val()
-
 Pub/sub
 -------
 

multi.go

@@ -19,10 +19,6 @@ func (c *Client) MultiClient() (*MultiClient, error) {
 	}, nil
 }
 
-func (c *MultiClient) Multi() {
-	c.reqs = make([]Req, 0)
-}
-
 func (c *MultiClient) Watch(keys ...string) *StatusReq {
 	args := append([]string{"WATCH"}, keys...)
 	req := NewStatusReq(args...)
@@ -43,7 +39,13 @@ func (c *MultiClient) Discard() {
 	c.mtx.Unlock()
 }
 
-func (c *MultiClient) Exec() ([]Req, error) {
+func (c *MultiClient) Exec(do func()) ([]Req, error) {
+	c.mtx.Lock()
+	c.reqs = make([]Req, 0)
+	c.mtx.Unlock()
+
+	do()
+
 	c.mtx.Lock()
 	if len(c.reqs) == 0 {
 		c.mtx.Unlock()

parser.go

@@ -40,7 +40,7 @@ func PackReq(args []string) []byte {
 
 type ReadLiner interface {
 	ReadLine() ([]byte, bool, error)
-	Peek(n int) ([]byte, error)
+	Read([]byte) (int, error)
 	ReadN(n int) ([]byte, error)
 }
 
@@ -121,13 +121,14 @@ func ParseReply(rd ReadLiner) (interface{}, error) {
 		line, err = rd.ReadN(replyLen)
 		if err == bufio.ErrBufferFull {
 			buf := make([]byte, replyLen)
-			r := 0
+			r := copy(buf, line)
 
-			r += copy(buf, line)
+			for r < replyLen {
-
+				n, err := rd.Read(buf[r:])
-			for err == bufio.ErrBufferFull {
+				if err != nil {
-				line, err = rd.ReadN(replyLen - r)
+					return "", err
-				r += copy(buf[r:], line)
+				}
+				r += n
 			}
 
 			line = buf

redis_test.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"io"
 	"net"
+	"runtime"
 	"strconv"
 	"sync"
 	"testing"
@@ -41,6 +42,7 @@ func (t *RedisTest) SetUpTest(c *C) {
 		return nil
 	}
 	t.client = redis.NewClient(openConn, closeConn, nil)
+	t.client.ConnPool.(*redis.MultiConnPool).MaxCap = 10
 	c.Assert(t.client.FlushDb().Err(), IsNil)
 }
 
@@ -164,10 +166,10 @@ func (t *RedisTest) TestConnPoolMaxCapOnMultiClient(c *C) {
 			multi, err := t.client.MultiClient()
 			c.Assert(err, IsNil)
 
-			multi.Multi()
+			var ping *redis.StatusReq
-
+			reqs, err := multi.Exec(func() {
-			ping := multi.Ping()
+				ping = multi.Ping()
-			reqs, err := multi.Exec()
+			})
 			c.Assert(err, IsNil)
 			c.Assert(reqs, HasLen, 1)
 			c.Assert(ping.Err(), IsNil)
@@ -2025,20 +2027,43 @@ func (t *RedisTest) TestPipelineEchoFromGoroutines(c *C) {
 
 //------------------------------------------------------------------------------
 
-func (t *RedisTest) TestMultiDiscard(c *C) {
+func (t *RedisTest) TestMultiExec(c *C) {
 	multi, err := t.client.MultiClient()
 	c.Assert(err, IsNil)
 	defer func() {
 		c.Assert(multi.Close(), IsNil)
 	}()
 
-	multi.Multi()
+	var (
+		set *redis.StatusReq
+		get *redis.BulkReq
+	)
+	reqs, err := multi.Exec(func() {
+		set = multi.Set("foo", "bar")
+		get = multi.Get("foo")
+	})
+	c.Assert(err, IsNil)
+	c.Assert(reqs, HasLen, 2)
 
+	c.Assert(set.Err(), IsNil)
+	c.Assert(set.Val(), Equals, "OK")
+
+	c.Assert(get.Err(), IsNil)
+	c.Assert(get.Val(), Equals, "bar")
+}
+
+func (t *RedisTest) TestMultiExecDiscard(c *C) {
+	multi, err := t.client.MultiClient()
+	c.Assert(err, IsNil)
+	defer func() {
+		c.Assert(multi.Close(), IsNil)
+	}()
+
+	reqs, err := multi.Exec(func() {
 		multi.Set("foo1", "bar1")
 		multi.Discard()
 		multi.Set("foo2", "bar2")
-
+	})
-	reqs, err := multi.Exec()
 	c.Assert(err, IsNil)
 	c.Assert(reqs, HasLen, 1)
 
@@ -2051,29 +2076,6 @@ func (t *RedisTest) TestMultiDiscard(c *C) {
 	c.Assert(get.Val(), Equals, "bar2")
 }
 
-func (t *RedisTest) TestMultiExec(c *C) {
-	multi, err := t.client.MultiClient()
-	c.Assert(err, IsNil)
-	defer func() {
-		c.Assert(multi.Close(), IsNil)
-	}()
-
-	multi.Multi()
-
-	setR := multi.Set("foo", "bar")
-	getR := multi.Get("foo")
-
-	reqs, err := multi.Exec()
-	c.Assert(err, IsNil)
-	c.Assert(reqs, HasLen, 2)
-
-	c.Assert(setR.Err(), IsNil)
-	c.Assert(setR.Val(), Equals, "OK")
-
-	c.Assert(getR.Err(), IsNil)
-	c.Assert(getR.Val(), Equals, "bar")
-}
-
 func (t *RedisTest) TestMultiExecOnEmptyQueue(c *C) {
 	multi, err := t.client.MultiClient()
 	c.Assert(err, IsNil)
@@ -2081,11 +2083,86 @@ func (t *RedisTest) TestMultiExecOnEmptyQueue(c *C) {
 		c.Assert(multi.Close(), IsNil)
 	}()
 
-	reqs, err := multi.Exec()
+	reqs, err := multi.Exec(func() {})
 	c.Assert(err, IsNil)
 	c.Assert(reqs, HasLen, 0)
 }
 
+func (t *RedisTest) TestMultiExecIncrTransaction(c *C) {
+	multi, err := t.client.MultiClient()
+	c.Assert(err, IsNil)
+	defer func() {
+		c.Assert(multi.Close(), IsNil)
+	}()
+
+	reqs, err := multi.Exec(func() {
+		for i := int64(0); i < 20000; i++ {
+			multi.Incr("TestIncrTransactionKey")
+		}
+	})
+	c.Assert(err, IsNil)
+	c.Assert(reqs, HasLen, 20000)
+	for _, req := range reqs {
+		if req.Err() != nil {
+			c.Errorf("got %v, expected nil", req.Err())
+		}
+	}
+
+	get := t.client.Get("TestIncrTransactionKey")
+	c.Assert(get.Err(), IsNil)
+	c.Assert(get.Val(), Equals, "20000")
+}
+
+func (t *RedisTest) transactionalIncr(c *C) ([]redis.Req, error) {
+	multi, err := t.client.MultiClient()
+	c.Assert(err, IsNil)
+	defer func() {
+		c.Assert(multi.Close(), IsNil)
+	}()
+
+	watch := multi.Watch("foo")
+	c.Assert(watch.Err(), IsNil)
+	c.Assert(watch.Val(), Equals, "OK")
+
+	get := multi.Get("foo")
+	c.Assert(get.Err(), IsNil)
+	c.Assert(get.Val(), Not(Equals), redis.Nil)
+
+	v, err := strconv.ParseInt(get.Val(), 10, 64)
+	c.Assert(err, IsNil)
+
+	reqs, err := multi.Exec(func() {
+		multi.Set("foo", strconv.FormatInt(v+1, 10))
+	})
+	if err == redis.Nil {
+		return t.transactionalIncr(c)
+	}
+	return reqs, err
+}
+
+func (t *RedisTest) TestWatchUnwatch(c *C) {
+	set := t.client.Set("foo", "0")
+	c.Assert(set.Err(), IsNil)
+	c.Assert(set.Val(), Equals, "OK")
+
+	wg := &sync.WaitGroup{}
+	for i := 0; i < 1000; i++ {
+		wg.Add(1)
+		go func() {
+			reqs, err := t.transactionalIncr(c)
+			c.Assert(reqs, HasLen, 1)
+			c.Assert(err, IsNil)
+			c.Assert(reqs[0].Err(), IsNil)
+			wg.Done()
+		}()
+	}
+	wg.Wait()
+
+	get := t.client.Get("foo")
+	c.Assert(get.Err(), IsNil)
+	c.Assert(get.Val(), Equals, "1000")
+}
+
 //------------------------------------------------------------------------------
 
 func (t *RedisTest) TestSyncEchoFromGoroutines(c *C) {
@@ -2120,90 +2197,6 @@ func (t *RedisTest) TestIncrFromGoroutines(c *C) {
 	c.Assert(get.Val(), Equals, "20000")
 }
 
-func (t *RedisTest) TestIncrTransaction(c *C) {
-	multi, err := t.client.MultiClient()
-	c.Assert(err, IsNil)
-	defer func() {
-		c.Assert(multi.Close(), IsNil)
-	}()
-
-	multi.Multi()
-
-	wg := &sync.WaitGroup{}
-	for i := int64(0); i < 20000; i++ {
-		wg.Add(1)
-		go func() {
-			multi.Incr("TestIncrTransactionKey")
-			wg.Done()
-		}()
-	}
-	wg.Wait()
-
-	reqs, err := multi.Exec()
-	c.Assert(err, IsNil)
-	c.Assert(reqs, HasLen, 20000)
-	for _, req := range reqs {
-		if req.Err() != nil {
-			c.Errorf("got %v, expected nil", req.Err())
-		}
-	}
-
-	get := t.client.Get("TestIncrTransactionKey")
-	c.Assert(get.Err(), IsNil)
-	c.Assert(get.Val(), Equals, "20000")
-}
-
-func (t *RedisTest) transactionalIncr(c *C, wg *sync.WaitGroup) {
-	multi, err := t.client.MultiClient()
-	c.Assert(err, IsNil)
-	defer func() {
-		c.Assert(multi.Close(), IsNil)
-	}()
-
-	watch := multi.Watch("foo")
-	c.Assert(watch.Err(), IsNil)
-	c.Assert(watch.Val(), Equals, "OK")
-
-	get := multi.Get("foo")
-	c.Assert(get.Err(), IsNil)
-	c.Assert(get.Val(), Not(Equals), redis.Nil)
-
-	v, err := strconv.ParseInt(get.Val(), 10, 64)
-	c.Assert(err, IsNil)
-
-	multi.Multi()
-	set := multi.Set("foo", strconv.FormatInt(v+1, 10))
-	reqs, err := multi.Exec()
-	if err == redis.Nil {
-		t.transactionalIncr(c, wg)
-		return
-	}
-	c.Assert(reqs, HasLen, 1)
-	c.Assert(err, IsNil)
-
-	c.Assert(set.Err(), IsNil)
-	c.Assert(set.Val(), Equals, "OK")
-
-	wg.Done()
-}
-
-func (t *RedisTest) TestWatchUnwatch(c *C) {
-	set := t.client.Set("foo", "0")
-	c.Assert(set.Err(), IsNil)
-	c.Assert(set.Val(), Equals, "OK")
-
-	wg := &sync.WaitGroup{}
-	for i := 0; i < 1000; i++ {
-		wg.Add(1)
-		go t.transactionalIncr(c, wg)
-	}
-	wg.Wait()
-
-	get := t.client.Get("foo")
-	c.Assert(get.Err(), IsNil)
-	c.Assert(get.Val(), Equals, "1000")
-}
-
 //------------------------------------------------------------------------------
 
 func (t *RedisTest) TestCmdBgRewriteAOF(c *C) {
@@ -2312,6 +2305,9 @@ func (t *RedisTest) TestTime(c *C) {
 func (t *RedisTest) BenchmarkRedisPing(c *C) {
 	c.StopTimer()
 
+	runtime.LockOSThread()
+	t.client.ConnPool.(*redis.MultiConnPool).MaxCap = 1
+
 	for i := 0; i < 10; i++ {
 		ping := t.client.Ping()
 		c.Assert(ping.Err(), IsNil)
@@ -2328,6 +2324,9 @@ func (t *RedisTest) BenchmarkRedisPing(c *C) {
 func (t *RedisTest) BenchmarkRedisSet(c *C) {
 	c.StopTimer()
 
+	runtime.LockOSThread()
+	t.client.ConnPool.(*redis.MultiConnPool).MaxCap = 1
+
 	for i := 0; i < 10; i++ {
 		set := t.client.Set("foo", "bar")
 		c.Assert(set.Err(), IsNil)
@@ -2344,6 +2343,9 @@ func (t *RedisTest) BenchmarkRedisSet(c *C) {
 func (t *RedisTest) BenchmarkRedisGetNil(c *C) {
 	c.StopTimer()
 
+	runtime.LockOSThread()
+	t.client.ConnPool.(*redis.MultiConnPool).MaxCap = 1
+
 	for i := 0; i < 10; i++ {
 		get := t.client.Get("foo")
 		c.Assert(get.Err(), Equals, redis.Nil)
@@ -2360,6 +2362,9 @@ func (t *RedisTest) BenchmarkRedisGetNil(c *C) {
 func (t *RedisTest) BenchmarkRedisGet(c *C) {
 	c.StopTimer()
 
+	runtime.LockOSThread()
+	t.client.ConnPool.(*redis.MultiConnPool).MaxCap = 1
+
 	set := t.client.Set("foo", "bar")
 	c.Assert(set.Err(), IsNil)
 
@@ -2379,6 +2384,9 @@ func (t *RedisTest) BenchmarkRedisGet(c *C) {
 func (t *RedisTest) BenchmarkRedisMGet(c *C) {
 	c.StopTimer()
 
+	runtime.LockOSThread()
+	t.client.ConnPool.(*redis.MultiConnPool).MaxCap = 1
+
 	mSet := t.client.MSet("foo1", "bar1", "foo2", "bar2")
 	c.Assert(mSet.Err(), IsNil)
 
@@ -2398,6 +2406,8 @@ func (t *RedisTest) BenchmarkRedisMGet(c *C) {
 func (t *RedisTest) BenchmarkRedisWriteRead(c *C) {
 	c.StopTimer()
 
+	runtime.LockOSThread()
+
 	conn, _, err := t.client.ConnPool.Get()
 	c.Assert(err, IsNil)