116 lines
2.1 KiB
Go
116 lines
2.1 KiB
Go
package lockx
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"log"
|
|
"time"
|
|
|
|
"github.com/go-redis/redis/v8"
|
|
)
|
|
|
|
// 全局锁
|
|
type globalLock struct {
|
|
redis *redis.Client
|
|
ctx context.Context
|
|
uniqueKey string
|
|
value string
|
|
}
|
|
|
|
func NewGlobalLock(ctx context.Context, red *redis.Client, uniqueKey string) *globalLock {
|
|
return &globalLock{
|
|
redis: red,
|
|
ctx: ctx,
|
|
uniqueKey: uniqueKey,
|
|
value: fmt.Sprintf("%d", time.Now().UnixNano()),
|
|
}
|
|
}
|
|
|
|
// 获取锁
|
|
func (g *globalLock) Lock() bool {
|
|
|
|
script := `
|
|
local token = redis.call('get',KEYS[1])
|
|
if token == false
|
|
then
|
|
return redis.call('set',KEYS[1],ARGV[1],'EX',ARGV[2])
|
|
end
|
|
return 'ERROR'
|
|
`
|
|
|
|
resp, err := g.redis.Eval(g.ctx, script, []string{g.uniqueKey}, g.value, 10).Result()
|
|
if resp != "OK" {
|
|
_ = err
|
|
// log.Println("globalLock Lock", resp, err, g.uniqueKey, g.value)
|
|
}
|
|
return resp == "OK"
|
|
}
|
|
|
|
// 尝试获取锁
|
|
func (g *globalLock) Try(limitTimes int) bool {
|
|
for i := 0; i < limitTimes; i++ {
|
|
if g.Lock() {
|
|
return true
|
|
}
|
|
time.Sleep(time.Millisecond * 100)
|
|
}
|
|
return false
|
|
}
|
|
|
|
// 删除锁
|
|
func (g *globalLock) Unlock() bool {
|
|
|
|
script := `
|
|
local token = redis.call('get',KEYS[1])
|
|
if token == ARGV[1]
|
|
then
|
|
redis.call('del',KEYS[1])
|
|
return 'OK'
|
|
end
|
|
return 'ERROR'
|
|
`
|
|
|
|
resp, err := g.redis.Eval(g.ctx, script, []string{g.uniqueKey}, g.value).Result()
|
|
if resp != "OK" {
|
|
log.Println("globalLock Unlock", resp, err, g.uniqueKey, g.value)
|
|
}
|
|
return resp == "OK"
|
|
}
|
|
|
|
// 刷新锁
|
|
func (g *globalLock) Refresh() {
|
|
go func() {
|
|
ctx, cancel := context.WithTimeout(g.ctx, time.Second*30)
|
|
defer cancel()
|
|
|
|
t := time.NewTicker(time.Second)
|
|
for {
|
|
select {
|
|
case <-t.C:
|
|
g.refresh()
|
|
case <-ctx.Done():
|
|
t.Stop()
|
|
return
|
|
}
|
|
}
|
|
}()
|
|
}
|
|
|
|
func (g *globalLock) refresh() bool {
|
|
script := `
|
|
local token = redis.call('get',KEYS[1])
|
|
if token == ARGV[1]
|
|
then
|
|
redis.call('set',KEYS[1],ARGV[1],'EX',ARGV[2])
|
|
return 'OK'
|
|
end
|
|
return 'ERROR'
|
|
`
|
|
|
|
resp, err := g.redis.Eval(g.ctx, script, []string{g.uniqueKey}, g.value, 5).Result()
|
|
if resp != "OK" {
|
|
log.Println("globalLock refresh", resp, err, g.uniqueKey, g.value)
|
|
}
|
|
return resp == "OK"
|
|
}
|