redis

A redis integrated gadget

Depends on redis 5.0.3

Examples

Store long-term data

r, err := redis.NewRediStore(10, "tcp", "127.0.0.1:6379", "")
if err != nil {
	t.Fatal(err)
}
defer r.Close()

id := 1
if err := r.PutJSON("testing", id, 0); err != nil {
	t.Fatal(err)
}
defer func(){
    if err := r.Delete("testing"); err != nil {
    	t.Fatal(err)
    }
}()

outId := 0
if err := r.ScanJSON("testing", &outId); err != nil {
	t.Fatal(err)
}

Store timed data

r, err := redis.NewRediStore(10, "tcp", "127.0.0.1:6379", "")
if err != nil {
	t.Fatal(err)
}
defer r.Close()

id := 1
timeout := 60 // seconds
if err := r.PutJSON("testing", id, timeout); err != nil {
	t.Fatal(err)
}

outId := 0
if err := r.ScanJSON("testing", &outId); err != nil {
	t.Fatal(err)
}

Distributed lock

r, err := redis.NewRediStore(10, "tcp", "127.0.0.1:6379", "")
if err != nil {
	t.Fatal(err)
}
defer r.Close()

key := fmt.Sprintf("%d", time.Now().UnixNano())
owner := "testing"
if err := r.Lock(key, owner, 60); err != nil{
    t.Fatal(err)
}
defer r.Unlock(key, owner)

Message queue

	streamName := "logs-stream"
	r, err := redis.NewRediStore(10, "tcp", "127.0.0.1:6379", "")
	if err != nil {
		log.Fatal(err)
	}
	defer r.Close()

	p := NewMsqProducer(r, streamName)
	if err := p.Put("msg title", []byte("msg body")); err != nil {
		log.Fatal(err)
	}

	delayOverdue := 5 * time.Minute
	consumer, err := NewMsqConsumer(context.TODO(),
		r,
		streamName,
        "0", // if you have a multiply reader, you need set a different client id.
		delayOrverdue,
	)
	if err != nil {
		log.Fatal(err)
	}

	handle := func(m *redis.MessageEntry) bool {
		// TODO: handle something
		//return false
		return true
	}

	// consume
    // for test, you can set the loop with times.
    for {
        if err := consumer.Next(handle); err != nil{
            log.Warn(errors.As(err))
            time.Sleep(time.Second)
        }
    }

License

MIT License for part of lock/msq, For others, please refer to:

https://github.com/gomodule/redigo/redis
https://github.com/garyburd/redigo
https://github.com/boj/redistore