mirror of https://github.com/go-redis/redis.git
124 lines
3.2 KiB
Go
124 lines
3.2 KiB
Go
// Copyright 2012 The Redis Client Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/*
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Package github.com/vmihailenco/redis implements a Redis client.
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Let's start with connecting to Redis:
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password := "" // no password set
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db := -1 // use default DB
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client := redis.NewTCPClient("localhost:6379", password, db)
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defer client.Close()
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Then we can start sending commands:
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if err := client.Set("foo", "bar"); err != nil { panic(err) }
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get := client.Get("foo")
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if err := get.Err(); err != nil { panic(err) }
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fmt.Println(get.Val())
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We can also pipeline two commands together:
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var set *redis.StatusReq
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var get *redis.StringReq
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reqs, err := client.Pipelined(func(c *redis.PipelineClient)) {
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set = c.Set("key1", "hello1")
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get = c.Get("key2")
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}
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if err != nil { panic(err) }
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if err := set.Err(); err != nil { panic(err) }
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if err := get.Err(); err != nil { panic(err) }
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fmt.Println(get.Val())
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fmt.Println(reqs[0] == set)
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fmt.Println(reqs[1] == get)
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or:
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pipeline, err := client.PipelineClient()
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if err != nil {
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panic(err)
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}
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defer pipeline.Close()
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set := pipeline.Set("key1", "hello1")
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get := pipleine.Get("key2")
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reqs, err := pipeline.RunQueued()
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if err != nil { panic(err) }
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if err := set.Err(); err != nil { panic(err) }
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if err := get.Err(); err != nil { panic(err) }
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fmt.Println(get.Val())
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fmt.Println(reqs[0] == set)
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fmt.Println(reqs[1] == get)
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We can also send several commands in transaction:
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func incrKeyInTransaction(multi *redis.MultiClient) ([]redis.Req, error) {
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get := multi.Get("key")
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if err := get.Err(); err != nil {
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panic(err)
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}
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val, err := strconv.ParseInt(get.Val(), 10, 64)
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if err != nil { panic(err) }
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reqs, err = multi.Exec(func() {
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multi.Set("key", val + 1)
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})
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// Transaction failed. Repeat.
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if err == redis.Nil {
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return incrKeyInTransaction(multi)
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}
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return reqs, err
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}
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multi, err := client.MultiClient()
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if err != nil { panic(err) }
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defer multi.Close()
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watch := multi.Watch("key")
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if err := watch.Err(); err != nil { panic(err) }
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reqs, err := incrKeyInTransaction(multi)
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if err != nil { panic(err) }
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for _, req := range reqs {
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// ...
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}
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To subscribe to the channel:
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pubsub, err := client.PubSubClient()
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if err != nil { panic(err) }
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defer pubsub.Close()
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ch, err := pubsub.Subscribe("mychannel")
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if err != nil { panic(err) }
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go func() {
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for msg := range ch {
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if err := msg.Err; err != nil { panic(err) }
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message := msg.Message
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}
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}
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You can also write custom commands:
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func Get(client *redis.Client, key string) *redis.StringReq {
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req := redis.NewStringReq("GET", key)
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client.Process(req)
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return req
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}
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get := Get(redisClient, "key")
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if err := get.Err(); err != nil && err != redis.Nil { panic(err) }
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Client uses connection pool to send commands. You can change maximum number of connections with:
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client.ConnPool.(*redis.MultiConnPool).MaxCap = 1
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*/
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package redis
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