Files
redis-go/cluster/commands/mset.go
2025-03-13 23:10:11 +08:00

109 lines
2.9 KiB
Go

package commands
import (
"github.com/hdt3213/godis/cluster/core"
"github.com/hdt3213/godis/interface/redis"
"github.com/hdt3213/godis/lib/utils"
"github.com/hdt3213/godis/redis/protocol"
)
func init() {
core.RegisterCmd("mset_", execMSetInLocal)
core.RegisterCmd("mset", execMSet)
}
type CmdLine = [][]byte
// node -> keys on the node
type RouteMap map[string][]string
func getRouteMap(cluster *core.Cluster, keys []string) RouteMap {
m := make(RouteMap)
for _, key := range keys {
slot := cluster.GetSlot(key)
node := cluster.PickNode(slot)
m[node] = append(m[node], key)
}
return m
}
// execMSetInLocal executes msets in local node
func execMSetInLocal(cluster *core.Cluster, c redis.Connection, cmdLine CmdLine) redis.Reply {
if len(cmdLine) < 3 {
return protocol.MakeArgNumErrReply("mset")
}
cmdLine[0] = []byte("mset")
return cluster.LocalExec(c, cmdLine)
}
func execMSet(cluster *core.Cluster, c redis.Connection, cmdLine CmdLine) redis.Reply {
if len(cmdLine) < 3 || len(cmdLine)%2 != 1 {
return protocol.MakeArgNumErrReply("mset")
}
var keys []string
for i := 1; i < len(cmdLine); i += 2 {
keys = append(keys, string(cmdLine[i]))
}
routeMap := getRouteMap(cluster, keys)
if len(routeMap) == 1 {
// only one node, do it fast
for node := range routeMap {
cmdLine[0] = []byte("mset_")
return cluster.Relay(node, c, cmdLine)
}
}
return execMSetSlow(cluster, c, cmdLine, routeMap)
}
func requestRollback(cluster *core.Cluster, c redis.Connection, txId string, routeMap RouteMap) {
rollbackCmd := utils.ToCmdLine("rollback", txId)
for node := range routeMap {
cluster.Relay(node, c, rollbackCmd)
}
}
// execMSetSlow execute mset through tcc
func execMSetSlow(cluster *core.Cluster, c redis.Connection, cmdLine CmdLine, routeMap RouteMap) redis.Reply {
txId := utils.RandString(6)
keyValues := make(map[string][]byte)
for i := 1; i < len(cmdLine); i += 2 {
key := string(cmdLine[i])
value := cmdLine[i+1]
keyValues[key] = value
}
// make prepare requests
nodePrepareCmdMap := make(map[string]CmdLine)
for node, keys := range routeMap {
prepareCmd := utils.ToCmdLine("prepare", txId, "mset")
for _, key := range keys {
value := keyValues[key]
prepareCmd = append(prepareCmd, []byte(key), value)
}
nodePrepareCmdMap[node] = prepareCmd
}
// send prepare request
for node, prepareCmd := range nodePrepareCmdMap {
reply := cluster.Relay(node, c, prepareCmd)
if protocol.IsErrorReply(reply) {
requestRollback(cluster, c, txId, routeMap)
return protocol.MakeErrReply("prepare failed")
}
}
// send commit request
commiteCmd := utils.ToCmdLine("commit", txId)
for node := range nodePrepareCmdMap {
reply := cluster.Relay(node, c, commiteCmd)
if protocol.IsErrorReply(reply) {
requestRollback(cluster, c, txId, routeMap)
return protocol.MakeErrReply("commit failed")
}
}
return protocol.MakeOkReply()
}