forked from gitstliu/go-redis-cluster
/
multi.go
162 lines (130 loc) · 3.02 KB
/
multi.go
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package redis
import (
"fmt"
)
type multiTask struct {
node *redisNode
slot uint16
cmd string
args []interface{}
reply interface{}
replies []interface{}
err error
done chan int
}
func (cluster *Cluster) multiSet(cmd string, args ...interface{}) (interface{}, error) {
if len(args)&1 != 0 {
return nil, fmt.Errorf("multiSet: invalid args %v", args)
}
tasks := make([]*multiTask, 0)
cluster.rwLock.RLock()
for i := 0; i < len(args); i += 2 {
key, err := key(args[i])
if err != nil {
cluster.rwLock.RUnlock()
return nil, fmt.Errorf("multiSet: invalid key %v", args[i])
}
slot := hash(key)
var j int
for j = 0; j < len(tasks); j++ {
if tasks[j].slot == slot {
tasks[j].args = append(tasks[j].args, args[i]) // key
tasks[j].args = append(tasks[j].args, args[i+1]) // value
break
}
}
if j == len(tasks) {
node := cluster.slots[slot]
if node == nil {
cluster.rwLock.RUnlock()
return nil, fmt.Errorf("multiSet: %s[%d] no node found", key, slot)
}
task := &multiTask{
node: node,
slot: slot,
cmd: cmd,
args: []interface{}{args[i], args[i+1]},
done: make(chan int),
}
tasks = append(tasks, task)
}
}
cluster.rwLock.RUnlock()
for i := range tasks {
go handleSetTask(tasks[i])
}
for i := range tasks {
<-tasks[i].done
}
for i := range tasks {
_, err := String(tasks[i].reply, tasks[i].err)
if err != nil {
return nil, err
}
}
return "OK", nil
}
func (cluster *Cluster) multiGet(cmd string, args ...interface{}) (interface{}, error) {
tasks := make([]*multiTask, 0)
index := make([]*multiTask, len(args))
cluster.rwLock.RLock()
for i := 0; i < len(args); i++ {
key, err := key(args[i])
if err != nil {
cluster.rwLock.RUnlock()
return nil, fmt.Errorf("multiGet: invalid key %v", args[i])
}
slot := hash(key)
var j int
for j = 0; j < len(tasks); j++ {
if tasks[j].slot == slot {
tasks[j].args = append(tasks[j].args, args[i]) // key
index[i] = tasks[j]
break
}
}
if j == len(tasks) {
node := cluster.slots[slot]
if node == nil {
cluster.rwLock.RUnlock()
return nil, fmt.Errorf("multiGet: %s[%d] no node found", key, slot)
}
task := &multiTask{
node: node,
slot: slot,
cmd: cmd,
args: []interface{}{args[i]},
done: make(chan int),
}
tasks = append(tasks, task)
index[i] = tasks[j]
}
}
cluster.rwLock.RUnlock()
for i := range tasks {
go handleGetTask(tasks[i])
}
for i := range tasks {
<-tasks[i].done
}
reply := make([]interface{}, len(args))
for i := range reply {
if index[i].err != nil {
return nil, index[i].err
}
if len(index[i].replies) < 0 {
panic("unreachable")
}
reply[i] = index[i].replies[0]
index[i].replies = index[i].replies[1:]
}
return reply, nil
}
func handleSetTask(task *multiTask) {
task.reply, task.err = task.node.do(task.cmd, task.args...)
task.done <- 1
}
func handleGetTask(task *multiTask) {
task.replies, task.err = Values(task.node.do(task.cmd, task.args...))
task.done <- 1
}