ledisdb/server/cmd_kv.go

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package server
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import (
"github.com/siddontang/ledisdb/ledis"
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"strconv"
"strings"
)
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func getCommand(c *client) error {
args := c.args
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if len(args) != 1 {
return ErrCmdParams
}
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if v, err := c.db.Get(args[0]); err != nil {
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return err
} else {
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c.resp.writeBulk(v)
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}
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return nil
}
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func setCommand(c *client) error {
args := c.args
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if len(args) != 2 {
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return ErrCmdParams
}
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if err := c.db.Set(args[0], args[1]); err != nil {
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return err
} else {
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c.resp.writeStatus(OK)
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}
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return nil
}
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func getsetCommand(c *client) error {
args := c.args
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if len(args) != 2 {
return ErrCmdParams
}
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if v, err := c.db.GetSet(args[0], args[1]); err != nil {
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return err
} else {
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c.resp.writeBulk(v)
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}
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return nil
}
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func setnxCommand(c *client) error {
args := c.args
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if len(args) != 2 {
return ErrCmdParams
}
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if n, err := c.db.SetNX(args[0], args[1]); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func existsCommand(c *client) error {
args := c.args
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if len(args) != 1 {
return ErrCmdParams
}
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if n, err := c.db.Exists(args[0]); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func incrCommand(c *client) error {
args := c.args
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if len(args) != 1 {
return ErrCmdParams
}
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if n, err := c.db.Incr(c.args[0]); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func decrCommand(c *client) error {
args := c.args
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if len(args) != 1 {
return ErrCmdParams
}
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if n, err := c.db.Decr(c.args[0]); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func incrbyCommand(c *client) error {
args := c.args
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if len(args) != 2 {
return ErrCmdParams
}
delta, err := ledis.StrInt64(args[1], nil)
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if err != nil {
return ErrValue
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}
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if n, err := c.db.IncrBy(c.args[0], delta); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func decrbyCommand(c *client) error {
args := c.args
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if len(args) != 2 {
return ErrCmdParams
}
delta, err := ledis.StrInt64(args[1], nil)
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if err != nil {
return ErrValue
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}
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if n, err := c.db.DecrBy(c.args[0], delta); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func delCommand(c *client) error {
args := c.args
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if len(args) == 0 {
return ErrCmdParams
}
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if n, err := c.db.Del(args...); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
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return nil
}
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func msetCommand(c *client) error {
args := c.args
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if len(args) == 0 || len(args)%2 != 0 {
return ErrCmdParams
}
kvs := make([]ledis.KVPair, len(args)/2)
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for i := 0; i < len(kvs); i++ {
kvs[i].Key = args[2*i]
kvs[i].Value = args[2*i+1]
}
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if err := c.db.MSet(kvs...); err != nil {
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return err
} else {
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c.resp.writeStatus(OK)
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}
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return nil
}
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// func setexCommand(c *client) error {
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// return nil
// }
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func mgetCommand(c *client) error {
args := c.args
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if len(args) == 0 {
return ErrCmdParams
}
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if v, err := c.db.MGet(args...); err != nil {
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return err
} else {
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c.resp.writeSliceArray(v)
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}
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return nil
}
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func expireCommand(c *client) error {
args := c.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 ErrValue
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}
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if v, err := c.db.Expire(args[0], duration); err != nil {
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return err
} else {
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c.resp.writeInteger(v)
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}
return nil
}
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func expireAtCommand(c *client) error {
args := c.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 ErrValue
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}
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if v, err := c.db.ExpireAt(args[0], when); err != nil {
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return err
} else {
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c.resp.writeInteger(v)
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}
return nil
}
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func ttlCommand(c *client) error {
args := c.args
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if len(args) != 1 {
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return ErrCmdParams
}
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if v, err := c.db.TTL(args[0]); err != nil {
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return err
} else {
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c.resp.writeInteger(v)
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}
return nil
}
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func persistCommand(c *client) error {
args := c.args
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if len(args) != 1 {
return ErrCmdParams
}
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if n, err := c.db.Persist(args[0]); err != nil {
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return err
} else {
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c.resp.writeInteger(n)
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}
return nil
}
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func parseScanArgs(c *client) (key []byte, match string, count int, err error) {
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args := c.args
count = 10
switch len(args) {
case 0:
key = nil
return
case 1, 3, 5:
key = args[0]
break
default:
err = ErrCmdParams
return
}
if len(args) == 3 {
switch strings.ToLower(ledis.String(args[1])) {
case "match":
match = ledis.String(args[2])
return
case "count":
count, err = strconv.Atoi(ledis.String(args[2]))
return
default:
err = ErrCmdParams
return
}
} else if len(args) == 5 {
if strings.ToLower(ledis.String(args[1])) != "match" {
err = ErrCmdParams
return
} else if strings.ToLower(ledis.String(args[3])) != "count" {
err = ErrCmdParams
return
}
match = ledis.String(args[2])
count, err = strconv.Atoi(ledis.String(args[4]))
return
}
return
}
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func xscanCommand(c *client) error {
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key, match, count, err := parseScanArgs(c)
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if err != nil {
return err
}
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if ay, err := c.db.Scan(key, count, false, match); err != nil {
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return err
} else {
data := make([]interface{}, 2)
if len(ay) < count {
data[0] = []byte("")
} else {
data[0] = ay[len(ay)-1]
}
data[1] = ay
c.resp.writeArray(data)
}
return nil
}
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func init() {
register("decr", decrCommand)
register("decrby", decrbyCommand)
register("del", delCommand)
register("exists", existsCommand)
register("get", getCommand)
register("getset", getsetCommand)
register("incr", incrCommand)
register("incrby", incrbyCommand)
register("mget", mgetCommand)
register("mset", msetCommand)
register("set", setCommand)
register("setnx", setnxCommand)
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register("expire", expireCommand)
register("expireat", expireAtCommand)
register("ttl", ttlCommand)
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register("persist", persistCommand)
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register("xscan", xscanCommand)
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}