redis/README.md

Readme

Redis client for Golang.

Getting Client instance

Example 1:

import "github.com/vmihailenco/redis"


address := ":6379"
password := "secret"
db := 0
redisClient := redis.NewTCPClient(address, password, db)

Example 2:

import "github.com/vmihailenco/redis"


openConn := func() (io.ReadWriter, error) {
    fmt.Println("Connecting...")
    return net.Dial("tcp", ":6379")
}

closeConn := func(conn io.ReadWriter) error {
    fmt.Println("Disconnecting...")
    conn.Close()
    return nil
}

initConn := func(client *redis.Client) error {
     auth := client.Auth("foo")
     if auth.Err() != nil {
         return auth.Err()
     }

     ping := client.Ping()
     if ping.Err() != nil {
         return ping.Err()
     }

     return nil
}

redisClient := redis.NewClient(openConn, closeConn, initConn)

Both closeConn and initConn functions can be nil.

Running commands

set := redisClient.Set("foo", "bar")
if set.Err() != nil {
    panic(set.Err())
}
ok := set.Val()

get := redisClient.Get("foo")
if get.Err() != nil {
    if get.Err() != redis.Nil {
        panic(get.Err())
    }
}
val := get.Val()

Pipelining

Client has ability to run several commands with one read/write:

multiClient := redisClient.Multi()

setReq := multiClient.Set("foo1", "bar1") // queue command SET
getReq := multiClient.Get("foo2") // queue command GET

reqs, err := multiClient.RunQueued() // run queued commands
if err != nil {
    panic(err)
}

if setReq.Err() != nil {
    panic(setReq.Err())
}

if getReq.Err() != nil && getReq.Err() != redis.Nil {
    panic(getReq.Err())
}

Multi/Exec

Example 1:

multiClient := redisClient.Multi()

get1 := multiClient.Get("foo1")
get2 := multiClient.Get("foo2")
_, err := multiClient.Exec()
if err != nil {
   panic(err)
}

if get1.Err() != nil && get1.Err() != redis.Nil {
    panic(get1.Err())
}
val1 := get1.Val()

if get2.Err() != nil && get2.Err() != redis.Nil {
    panic(get2.Err())
}
val2 := get2.Val()

Example 2:

multiClient := redisClient.Multi()

multiClient.Get("foo1")
multiClient.Get("foo2")
reqs, err := multiClient.Exec()
if err != nil {
    panic(err)
}

for req := range reqs {
    if req.Err() != nil && req.Err() != redis.Nil {
        panic(req.Err())
    }
}

Pub/sub

Publish:

pub := redisClient.Publish("mychannel", "hello")
if pub.Err() != nil {
    panic(pub.Err())
}

Subscribe:

pubsub, err := redisClient.PubSubClient()
if err != nil {
    panic(err)
}

ch, err := pubsub.Subscribe("mychannel")
if err != nil {
    panic(err)
}

go func() {
    for msg := range ch {
        if msg.Err != nil {
            panic(err)
        }
        message := msg.Message
    }
}

Thread safety

Commands are thread safe. Following code is correct:

for i := 0; i < 1000; i++ {
    go func() {
        redisClient.Incr("foo")
    }()
}

Custom commands

Example:

func Get(client *redis.Client, key string) *redis.BulkReq {
    req := redis.NewBulkReq("GET", key)
    client.Process(req)
    return req
}

get := Get(redisClient, "foo")
if get.Err() != nil && get.Err() != redis.Nil {
    panic(get.Err())
}

Connection pool

Client uses connection pool with default capacity of 10 connections. To change pool capacity:

redisClient.ConnPool.(*redis.MultiConnPool).MaxCap = 1