ledisdb/ssdb/cmd_zset.go

459 lines
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2014-05-03 10:55:12 +04:00
package ssdb
2014-05-08 06:54:33 +04:00
import (
"errors"
"github.com/siddontang/golib/hack"
"math"
"strconv"
"strings"
)
//for simple implementation, we only support int64 score
const (
MinScore int64 = -1<<63 + 1
MaxScore int64 = 1<<63 - 1
)
var errScoreOverflow = errors.New("zset score overflow")
func zaddCommand(c *client) error {
args := c.args
if len(args) < 3 {
return ErrCmdParams
}
key := args[0]
if len(args[1:])%2 != 0 {
return ErrCmdParams
}
args = args[1:]
params := make([]interface{}, len(args))
for i := 0; i < len(params); i += 2 {
score, err := strconv.ParseInt(hack.String(args[i]), 10, 64)
if err != nil {
return err
}
params[i] = score
params[i+1] = args[i+1]
}
if n, err := c.app.zset_add(key, params); err != nil {
return err
} else {
c.writeInteger(n)
}
return nil
}
func zcardCommand(c *client) error {
args := c.args
if len(args) != 1 {
return ErrCmdParams
}
if n, err := c.app.zset_card(args[0]); err != nil {
return err
} else {
c.writeInteger(n)
}
return nil
}
func zscoreCommand(c *client) error {
args := c.args
if len(args) != 2 {
return ErrCmdParams
}
if v, err := c.app.zset_score(args[0], args[1]); err != nil {
return err
} else {
c.writeBulk(v)
}
return nil
}
func zremCommand(c *client) error {
args := c.args
if len(args) < 2 {
return ErrCmdParams
}
if n, err := c.app.zset_rem(args[0], args[1:]); err != nil {
return err
} else {
c.writeInteger(n)
}
return nil
}
func zincrbyCommand(c *client) error {
args := c.args
if len(args) != 3 {
return ErrCmdParams
}
key := args[0]
delta, err := strconv.ParseInt(hack.String(args[1]), 10, 64)
if err != nil {
return err
}
if v, err := c.app.zset_incrby(key, delta, args[2]); err != nil {
return err
} else {
c.writeBulk(v)
}
return nil
}
func zparseScoreRange(minBuf []byte, maxBuf []byte) (min int64, max int64, err error) {
if strings.ToLower(hack.String(minBuf)) == "-inf" {
min = math.MinInt64
} else {
var lopen bool = false
if minBuf[0] == '(' {
lopen = true
minBuf = minBuf[1:]
}
if len(minBuf) == 0 {
err = ErrCmdParams
return
}
min, err = strconv.ParseInt(hack.String(minBuf), 10, 64)
if err != nil {
return
}
if min <= MinScore || min >= MaxScore {
err = errScoreOverflow
return
}
if lopen {
min++
}
}
if strings.ToLower(hack.String(maxBuf)) == "+inf" {
max = math.MaxInt64
} else {
var ropen = false
if maxBuf[0] == '(' {
ropen = true
maxBuf = maxBuf[1:]
}
if len(maxBuf) == 0 {
err = ErrCmdParams
return
}
max, err = strconv.ParseInt(hack.String(maxBuf), 10, 64)
if err != nil {
return
}
if max <= MinScore || max >= MaxScore {
err = errScoreOverflow
return
}
if ropen {
max--
}
}
return
}
func zcountCommand(c *client) error {
args := c.args
if len(args) != 3 {
return ErrCmdParams
}
min, max, err := zparseScoreRange(args[1], args[2])
if err != nil {
return err
}
if min > max {
c.writeInteger(0)
return nil
}
if n, err := c.app.zset_count(args[0], min, max); err != nil {
return err
} else {
c.writeInteger(n)
}
return nil
}
func zrankCommand(c *client) error {
args := c.args
if len(args) != 2 {
return ErrCmdParams
}
if n, err := c.app.zset_rank(args[0], args[1], false); err != nil {
return err
} else if n == -1 {
c.writeBulk(nil)
} else {
c.writeInteger(n)
}
return nil
}
func zrevrankCommand(c *client) error {
args := c.args
if len(args) != 2 {
return ErrCmdParams
}
if n, err := c.app.zset_rank(args[0], args[1], true); err != nil {
return err
} else if n == -1 {
c.writeBulk(nil)
} else {
c.writeInteger(n)
}
return nil
}
func zremrangebyrankCommand(c *client) error {
args := c.args
if len(args) != 3 {
return ErrCmdParams
}
key := args[0]
offset, limit, err := zparseRange(c, key, args[1], args[2])
if err != nil {
return err
}
if offset < 0 {
c.writeInteger(0)
return nil
}
if n, err := c.app.zset_remRange(key, MinScore, MaxScore, offset, limit); err != nil {
return err
} else {
c.writeInteger(n)
}
return nil
}
func zremrangebyscoreCommand(c *client) error {
args := c.args
if len(args) != 3 {
return ErrCmdParams
}
key := args[0]
min, max, err := zparseScoreRange(args[1], args[2])
if err != nil {
return err
}
if n, err := c.app.zset_remRange(key, min, max, 0, -1); err != nil {
return err
} else {
c.writeInteger(n)
}
return nil
}
func zparseRange(c *client, key []byte, startBuf []byte, stopBuf []byte) (offset int, limit int, err error) {
var start int
var stop int
if start, err = strconv.Atoi(hack.String(startBuf)); err != nil {
return
}
if stop, err = strconv.Atoi(hack.String(stopBuf)); err != nil {
return
}
if start < 0 || stop < 0 {
//refer redis implementation
var size int64
size, err = c.app.zset_card(key)
if err != nil {
return
}
llen := int(size)
if start < 0 {
start = llen + start
}
if stop < 0 {
stop = llen + stop
}
if start < 0 {
start = 0
}
if start >= llen {
offset = -1
return
}
}
if start > stop {
offset = -1
return
}
offset = start
limit = (stop - start) + 1
return
}
func zrangeGeneric(c *client, reverse bool) error {
args := c.args
if len(args) < 3 {
return ErrCmdParams
}
key := args[0]
offset, limit, err := zparseRange(c, key, args[1], args[2])
if err != nil {
return err
}
if offset < 0 {
c.writeArray([]interface{}{})
return nil
}
args = args[3:]
var withScores bool = false
if len(args) > 0 && strings.ToLower(hack.String(args[0])) == "withscores" {
withScores = true
}
if v, err := c.app.zset_range(key, MinScore, MaxScore, withScores, offset, limit, reverse); err != nil {
return err
} else {
c.writeArray(v)
}
return nil
}
func zrangeCommand(c *client) error {
return zrangeGeneric(c, false)
}
func zrevrangeCommand(c *client) error {
return zrangeGeneric(c, true)
}
func zrangebyscoreGeneric(c *client, reverse bool) error {
args := c.args
if len(args) < 3 {
return ErrCmdParams
}
key := args[0]
min, max, err := zparseScoreRange(args[1], args[2])
if err != nil {
return err
}
args = args[3:]
var withScores bool = false
if len(args) > 0 && strings.ToLower(hack.String(args[0])) == "withscores" {
withScores = true
args = args[1:]
}
var offset int = 0
var limit int = -1
if len(args) > 0 {
if len(args) != 3 {
return ErrCmdParams
}
if strings.ToLower(hack.String(args[0])) != "limit" {
return ErrCmdParams
}
if offset, err = strconv.Atoi(hack.String(args[1])); err != nil {
return ErrCmdParams
}
if limit, err = strconv.Atoi(hack.String(args[2])); err != nil {
return ErrCmdParams
}
}
if offset < 0 {
//for redis, if offset < 0, a empty will return
//so here we directly return a empty array
c.writeArray([]interface{}{})
return nil
}
if v, err := c.app.zset_range(key, min, max, withScores, offset, limit, reverse); err != nil {
return err
} else {
c.writeArray(v)
}
return nil
}
func zrangebyscoreCommand(c *client) error {
return zrangebyscoreGeneric(c, false)
}
func zrevrangebyscoreCommand(c *client) error {
return zrangebyscoreGeneric(c, true)
}
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func init() {
register("zadd", zaddCommand)
register("zcard", zcardCommand)
register("zcount", zcountCommand)
register("zincrby", zincrbyCommand)
register("zrange", zrangeCommand)
register("zrangebyscore", zrangebyscoreCommand)
register("zrank", zrankCommand)
register("zrem", zremCommand)
register("zremrangebyrank", zremrangebyrankCommand)
register("zremrangebyscore", zremrangebyscoreCommand)
register("zrevrange", zrevrangeCommand)
register("zrevrank", zrevrankCommand)
register("zrevrangebyscore", zrevrangebyscoreCommand)
register("zscore", zscoreCommand)
}