func main() {
var c *redis.Client
conf := redis.DefaultConfig()
// Network and address
//
// Default are "tcp" and "127.0.0.1:6379" so these are commented out.
// TCP example:
// conf.Network = "tcp"
// conf.Address = "127.0.0.1:6379"
// Unix example:
// conf.Network = "unix"
// conf.Address = "/tmp/redis.sock"
conf.Database = 8 // Database number
conf.Timeout = time.Duration(10) * time.Second // Socket timeout
c = redis.NewClient(conf)
defer c.Close()
//** Blocking calls
rep := c.Flushdb()
if rep.Err != nil {
fmt.Println("redis:", rep.Err)
return
}
//* Strings
// It's generally good idea to check for errors like this,
// but for the sake of keeping this example short we'll omit these from now on.
if rep = c.Set("mykey0", "myval0"); rep.Err != nil {
fmt.Println("redis:", rep.Err)
return
}
var err error
var s string
if rep = c.Get("mykey0_may_not_exist"); rep.Type == redis.ReplyNil {
//key not found
fmt.Println("key not found ")
} else if s, err = rep.Str(); err != nil {
fmt.Println("Get error ", err)
return
}
fmt.Println("mykey0:", s)
myhash := map[string]string{
"mykey1": "myval1",
"mykey2": "myval2",
"mykey3": "myval3",
}
// Alternatively:
// c.Mset("mykey1", "myval1", "mykey2", "myval2", "mykey3", "myval3")
c.Mset(myhash)
ls, err := c.Mget("mykey1", "mykey2", "mykey3").List()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("mykeys values:", ls)
//* List handling
mylist := []string{"foo", "bar", "qux"}
// Alternativaly:
// c.Rpush("mylist", "foo", "bar", "qux")
c.Rpush("mylist", mylist)
mylist, err = c.Lrange("mylist_may_not_exist", 0, -1).List()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("mylist:", mylist)
//* Hash handling
// Alternatively:
// c.Hmset("myhash", ""mykey1", "myval1", "mykey2", "myval2", "mykey3", "myval3")
c.Hmset("myhash", myhash)
myhash, err = c.Hgetall("myhash").Hash()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("myhash:", myhash)
//* Multicalls
rep = c.MultiCall(func(mc *redis.MultiCall) {
mc.Set("multikey", "multival")
mc.Get("multikey")
})
// Multicall reply is guaranteed to have the same number of sub-replies as calls,
// if it succeeds. They can be accessed through Reply.Elems.
if rep.Err != nil {
fmt.Println(rep.Err)
return
}
s, err = rep.Elems[1].Str()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("multikey:", s)
//* Transactions
rep = c.Transaction(func(mc *redis.MultiCall) {
mc.Set("trankey", "tranval")
mc.Get("trankey")
})
if rep.Err != nil {
fmt.Println(rep.Err)
return
}
s, err = rep.Elems[1].Str()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("trankey:", s)
//* Complex transactions
// Atomic INCR replacement with transactions
myIncr := func(key string) *redis.Reply {
return c.MultiCall(func(mc *redis.MultiCall) {
var curval int
mc.Watch(key)
mc.Get(key)
rep := mc.Flush()
if rep.Err != nil {
return
}
s, err := rep.Elems[1].Str()
if err == nil {
curval, err = strconv.Atoi(s)
}
nextval := curval + 1
mc.Multi()
mc.Set(key, nextval)
mc.Exec()
})
}
myIncr("ctrankey")
myIncr("ctrankey")
myIncr("ctrankey")
s, err = c.Get("ctrankey").Str()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("ctrankey:", s)
//** Asynchronous calls
c.Set("asynckey", "asyncval")
fut := c.AsyncGet("asynckey")
// do something here
// block until reply is available
s, err = fut.Reply().Str()
if err != nil {
fmt.Println(err)
return
}
fmt.Println("asynckey:", s)
//* Pub/sub
msgHdlr := func(msg *redis.Message) {
switch msg.Type {
case redis.MessageMessage:
fmt.Printf("Received message \"%s\" from channel \"%s\".\n", msg.Payload, msg.Channel)
case redis.MessagePmessage:
fmt.Printf("Received pattern message \"%s\" from channel \"%s\" with pattern "+
"\"%s\".\n", msg.Payload, msg.Channel, msg.Pattern)
default:
fmt.Println("Received other message:", msg)
}
}
sub, err_ := c.Subscription(msgHdlr)
if err_ != nil {
fmt.Printf("Failed to subscribe: '%s'!\n", err_)
return
}
defer sub.Close()
sub.Subscribe("chan1", "chan2")
sub.Psubscribe("chan*")
c.Publish("chan1", "foo")
sub.Unsubscribe("chan1")
c.Publish("chan2", "bar")
// give some time for the message handler to receive the messages
time.Sleep(time.Second)
}
func setHandle(data string, c *redis.Client, ch chan struct{}) {
for _ = range ch {
c.Set(key, data)
}
}