ledisdb/server/cmd_zset.go

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package server
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import (
"errors"
"github.com/siddontang/ledisdb/ledis"
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"math"
"strconv"
"strings"
)
//for simple implementation, we only support int64 score
var errScoreOverflow = errors.New("zset score overflow")
func zaddCommand(req *requestContext) error {
args := req.args
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if len(args) < 3 {
return ErrCmdParams
}
key := args[0]
if len(args[1:])%2 != 0 {
return ErrCmdParams
}
args = args[1:]
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params := make([]ledis.ScorePair, len(args)/2)
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for i := 0; i < len(params); i++ {
score, err := ledis.StrInt64(args[2*i], nil)
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if err != nil {
return err
}
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params[i].Score = score
params[i].Member = args[2*i+1]
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}
if n, err := req.db.ZAdd(key, params...); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zcardCommand(req *requestContext) error {
args := req.args
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if len(args) != 1 {
return ErrCmdParams
}
if n, err := req.db.ZCard(args[0]); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zscoreCommand(req *requestContext) error {
args := req.args
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if len(args) != 2 {
return ErrCmdParams
}
if s, err := req.db.ZScore(args[0], args[1]); err != nil {
if err == ledis.ErrScoreMiss {
req.resp.writeBulk(nil)
} else {
return err
}
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} else {
req.resp.writeBulk(ledis.StrPutInt64(s))
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}
return nil
}
func zremCommand(req *requestContext) error {
args := req.args
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if len(args) < 2 {
return ErrCmdParams
}
if n, err := req.db.ZRem(args[0], args[1:]...); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zincrbyCommand(req *requestContext) error {
args := req.args
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if len(args) != 3 {
return ErrCmdParams
}
key := args[0]
delta, err := ledis.StrInt64(args[1], nil)
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if err != nil {
return err
}
if v, err := req.db.ZIncrBy(key, delta, args[2]); err != nil {
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return err
} else {
req.resp.writeBulk(ledis.StrPutInt64(v))
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}
return nil
}
func zparseScoreRange(minBuf []byte, maxBuf []byte) (min int64, max int64, err error) {
if strings.ToLower(ledis.String(minBuf)) == "-inf" {
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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 = ledis.StrInt64(minBuf, nil)
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if err != nil {
return
}
if min <= ledis.MinScore || min >= ledis.MaxScore {
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err = errScoreOverflow
return
}
if lopen {
min++
}
}
if strings.ToLower(ledis.String(maxBuf)) == "+inf" {
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max = math.MaxInt64
} else {
var ropen = false
if maxBuf[0] == '(' {
ropen = true
maxBuf = maxBuf[1:]
}
if len(maxBuf) == 0 {
err = ErrCmdParams
return
}
max, err = ledis.StrInt64(maxBuf, nil)
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if err != nil {
return
}
if max <= ledis.MinScore || max >= ledis.MaxScore {
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err = errScoreOverflow
return
}
if ropen {
max--
}
}
return
}
func zcountCommand(req *requestContext) error {
args := req.args
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if len(args) != 3 {
return ErrCmdParams
}
min, max, err := zparseScoreRange(args[1], args[2])
if err != nil {
return err
}
if min > max {
req.resp.writeInteger(0)
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return nil
}
if n, err := req.db.ZCount(args[0], min, max); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zrankCommand(req *requestContext) error {
args := req.args
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if len(args) != 2 {
return ErrCmdParams
}
if n, err := req.db.ZRank(args[0], args[1]); err != nil {
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return err
} else if n == -1 {
req.resp.writeBulk(nil)
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} else {
req.resp.writeInteger(n)
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}
return nil
}
func zrevrankCommand(req *requestContext) error {
args := req.args
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if len(args) != 2 {
return ErrCmdParams
}
if n, err := req.db.ZRevRank(args[0], args[1]); err != nil {
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return err
} else if n == -1 {
req.resp.writeBulk(nil)
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} else {
req.resp.writeInteger(n)
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}
return nil
}
func zremrangebyrankCommand(req *requestContext) error {
args := req.args
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if len(args) != 3 {
return ErrCmdParams
}
key := args[0]
start, stop, err := zparseRange(req, args[1], args[2])
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if err != nil {
return err
}
if n, err := req.db.ZRemRangeByRank(key, start, stop); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zremrangebyscoreCommand(req *requestContext) error {
args := req.args
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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 := req.db.ZRemRangeByScore(key, min, max); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zparseRange(req *requestContext, a1 []byte, a2 []byte) (start int, stop int, err error) {
if start, err = strconv.Atoi(ledis.String(a1)); err != nil {
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return
}
if stop, err = strconv.Atoi(ledis.String(a2)); err != nil {
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return
}
return
}
func zrangeGeneric(req *requestContext, reverse bool) error {
args := req.args
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if len(args) < 3 {
return ErrCmdParams
}
key := args[0]
start, stop, err := zparseRange(req, args[1], args[2])
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if err != nil {
return err
}
args = args[3:]
var withScores bool = false
if len(args) > 0 && strings.ToLower(ledis.String(args[0])) == "withscores" {
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withScores = true
}
if datas, err := req.db.ZRangeGeneric(key, start, stop, reverse); err != nil {
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return err
} else {
req.resp.writeScorePairArray(datas, withScores)
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}
return nil
}
func zrangeCommand(req *requestContext) error {
return zrangeGeneric(req, false)
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}
func zrevrangeCommand(req *requestContext) error {
return zrangeGeneric(req, true)
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}
func zrangebyscoreGeneric(req *requestContext, reverse bool) error {
args := req.args
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if len(args) < 3 {
return ErrCmdParams
}
key := args[0]
var minScore, maxScore []byte
if !reverse {
minScore, maxScore = args[1], args[2]
} else {
minScore, maxScore = args[2], args[1]
}
min, max, err := zparseScoreRange(minScore, maxScore)
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if err != nil {
return err
}
args = args[3:]
var withScores bool = false
if len(args) > 0 && strings.ToLower(ledis.String(args[0])) == "withscores" {
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withScores = true
args = args[1:]
}
var offset int = 0
var count int = -1
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if len(args) > 0 {
if len(args) != 3 {
return ErrCmdParams
}
if strings.ToLower(ledis.String(args[0])) != "limit" {
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return ErrCmdParams
}
if offset, err = strconv.Atoi(ledis.String(args[1])); err != nil {
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return ErrCmdParams
}
if count, err = strconv.Atoi(ledis.String(args[2])); err != nil {
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return ErrCmdParams
}
}
if offset < 0 {
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//for ledis, if offset < 0, a empty will return
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//so here we directly return a empty array
req.resp.writeArray([]interface{}{})
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return nil
}
if datas, err := req.db.ZRangeByScoreGeneric(key, min, max, offset, count, reverse); err != nil {
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return err
} else {
req.resp.writeScorePairArray(datas, withScores)
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}
return nil
}
func zrangebyscoreCommand(req *requestContext) error {
return zrangebyscoreGeneric(req, false)
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}
func zrevrangebyscoreCommand(req *requestContext) error {
return zrangebyscoreGeneric(req, true)
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}
func zclearCommand(req *requestContext) error {
args := req.args
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if len(args) != 1 {
return ErrCmdParams
}
if n, err := req.db.ZClear(args[0]); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
func zmclearCommand(req *requestContext) error {
args := req.args
if len(args) < 1 {
return ErrCmdParams
}
if n, err := req.db.ZMclear(args...); err != nil {
return err
} else {
req.resp.writeInteger(n)
}
return nil
}
func zexpireCommand(req *requestContext) error {
args := req.args
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if len(args) != 2 {
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return ErrCmdParams
}
duration, err := ledis.StrInt64(args[1], nil)
if err != nil {
return err
}
if v, err := req.db.ZExpire(args[0], duration); err != nil {
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return err
} else {
req.resp.writeInteger(v)
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}
return nil
}
func zexpireAtCommand(req *requestContext) error {
args := req.args
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if len(args) != 2 {
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return ErrCmdParams
}
when, err := ledis.StrInt64(args[1], nil)
if err != nil {
return err
}
if v, err := req.db.ZExpireAt(args[0], when); err != nil {
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return err
} else {
req.resp.writeInteger(v)
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}
return nil
}
func zttlCommand(req *requestContext) error {
args := req.args
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if len(args) != 1 {
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return ErrCmdParams
}
if v, err := req.db.ZTTL(args[0]); err != nil {
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return err
} else {
req.resp.writeInteger(v)
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}
return nil
}
func zpersistCommand(req *requestContext) error {
args := req.args
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if len(args) != 1 {
return ErrCmdParams
}
if n, err := req.db.ZPersist(args[0]); err != nil {
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return err
} else {
req.resp.writeInteger(n)
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}
return nil
}
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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)
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//ledisdb special command
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register("zclear", zclearCommand)
register("zmclear", zmclearCommand)
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register("zexpire", zexpireCommand)
register("zexpireat", zexpireAtCommand)
register("zttl", zttlCommand)
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register("zpersist", zpersistCommand)
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}