/
redisguard.go
152 lines (135 loc) · 3.11 KB
/
redisguard.go
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package redisguard
import (
"context"
"fmt"
"sync"
"time"
"github.com/cfhamlet/os-rq-pod/pkg/log"
"github.com/cfhamlet/os-rq-pod/pkg/serv"
"github.com/cfhamlet/os-rq-pod/pkg/sth"
"github.com/cfhamlet/os-rq-pod/pkg/utils"
"github.com/cfhamlet/os-rq-pod/pod/global"
"github.com/cfhamlet/os-rq-pod/pod/queuebox"
"github.com/cfhamlet/os-rq-pod/pod/redisconfig"
"github.com/go-redis/redis/v7"
"github.com/spf13/cast"
)
// RedisMemoryLimit TODO
var RedisMemoryLimit = "limit.redis.memory"
// Task TODO
type Task struct {
guard *Guard
stop chan struct{}
}
// NewTask TODO
func NewTask(guard *Guard) *Task {
return &Task{guard, make(chan struct{})}
}
func (task *Task) run() {
for {
info, err := task.guard.client.Info("memory").Result()
if err != nil {
log.Logger.Warningf("update redis memory fail", err)
} else {
_, memStr := utils.ExtractRedisInfo(info, "used_memory_rss")
memory, err := cast.ToInt64E(memStr)
if err != nil {
log.Logger.Warningf("update redis memory fail", err)
} else {
task.guard.updateRedisMemory(memory)
}
}
select {
case <-task.stop:
case <-time.After(time.Second):
}
}
}
// Start TODO
func (task *Task) Start() {
go task.run()
}
// Stop TODO
func (task *Task) Stop() {
close(task.stop)
}
// Guard TODO
type Guard struct {
*serv.Serv
queueBox *queuebox.QueueBox
client *redis.Client
maxRedisMemory int64
redisMemory int64
updateTime time.Time
task *Task
*sync.RWMutex
}
// New TODO
func New(serv *serv.Serv, queueBox *queuebox.QueueBox, client *redis.Client) *Guard {
return &Guard{
serv,
queueBox,
client,
0, 0,
time.Now(),
nil,
&sync.RWMutex{},
}
}
// OnStart TODO
func (guard *Guard) OnStart(context.Context) error {
guard.maxRedisMemory = guard.Conf().GetInt64(RedisMemoryLimit)
err := guard.Serv.Message().Subscribe(redisconfig.ConfigUpdated, guard.updateLimit)
if err != nil {
return err
}
guard.task = NewTask(guard)
guard.task.Start()
return nil
}
// OnStop TODO
func (guard *Guard) OnStop(context.Context) error {
guard.task.Stop()
return nil
}
func (guard *Guard) updateRedisMemory(memory int64) {
guard.Lock()
defer guard.Unlock()
guard.redisMemory = memory
guard.updateTime = time.Now()
log.Logger.Debugf("update redis memeory %d, max %d",
memory, guard.maxRedisMemory)
}
func (guard *Guard) updateLimit(key string, value interface{}) {
guard.Lock()
defer guard.Unlock()
if key != RedisMemoryLimit {
return
}
old := guard.maxRedisMemory
new := cast.ToInt64(value)
guard.maxRedisMemory = new
log.Logger.Infof("update %s from %v to %v", RedisMemoryLimit, old, new)
}
// Info TODO
func (guard *Guard) Info() sth.Result {
guard.RLock()
defer guard.RUnlock()
result := sth.Result{
"memoroy": guard.redisMemory,
"max_memoroy": guard.maxRedisMemory,
"update_time": guard.updateTime.Unix(),
}
return result
}
// Guard TODO
func (guard *Guard) Guard() error {
guard.RLock()
defer guard.RUnlock()
if guard.redisMemory > guard.maxRedisMemory {
return global.ExceedLimitError(
fmt.Sprintf("redis memory %v, max %v",
guard.redisMemory, guard.maxRedisMemory))
}
return nil
}