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example_test.go
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example_test.go
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package redis_test
import (
"fmt"
"strconv"
"sync"
"time"
"github.com/go-redis/redis"
)
var client *redis.Client
func init() {
client = redis.NewClient(&redis.Options{
Addr: ":6379",
DialTimeout: 10 * time.Second,
ReadTimeout: 30 * time.Second,
WriteTimeout: 30 * time.Second,
PoolSize: 10,
PoolTimeout: 30 * time.Second,
})
client.FlushDB()
}
func ExampleNewClient() {
client := redis.NewClient(&redis.Options{
Addr: "localhost:6379",
Password: "", // no password set
DB: 0, // use default DB
})
pong, err := client.Ping().Result()
fmt.Println(pong, err)
// Output: PONG <nil>
}
func ExampleParseURL() {
opt, err := redis.ParseURL("redis://:qwerty@localhost:6379/1")
if err != nil {
panic(err)
}
fmt.Println("addr is", opt.Addr)
fmt.Println("db is", opt.DB)
fmt.Println("password is", opt.Password)
// Create client as usually.
_ = redis.NewClient(opt)
// Output: addr is localhost:6379
// db is 1
// password is qwerty
}
func ExampleNewFailoverClient() {
// See http://redis.io/topics/sentinel for instructions how to
// setup Redis Sentinel.
client := redis.NewFailoverClient(&redis.FailoverOptions{
MasterName: "master",
SentinelAddrs: []string{":26379"},
})
client.Ping()
}
func ExampleNewClusterClient() {
// See http://redis.io/topics/cluster-tutorial for instructions
// how to setup Redis Cluster.
client := redis.NewClusterClient(&redis.ClusterOptions{
Addrs: []string{":7000", ":7001", ":7002", ":7003", ":7004", ":7005"},
})
client.Ping()
}
func ExampleNewRing() {
client := redis.NewRing(&redis.RingOptions{
Addrs: map[string]string{
"shard1": ":7000",
"shard2": ":7001",
"shard3": ":7002",
},
})
client.Ping()
}
func ExampleClient() {
err := client.Set("key", "value", 0).Err()
if err != nil {
panic(err)
}
val, err := client.Get("key").Result()
if err != nil {
panic(err)
}
fmt.Println("key", val)
val2, err := client.Get("key2").Result()
if err == redis.Nil {
fmt.Println("key2 does not exists")
} else if err != nil {
panic(err)
} else {
fmt.Println("key2", val2)
}
// Output: key value
// key2 does not exists
}
func ExampleClient_Set() {
// Last argument is expiration. Zero means the key has no
// expiration time.
err := client.Set("key", "value", 0).Err()
if err != nil {
panic(err)
}
// key2 will expire in an hour.
err = client.Set("key2", "value", time.Hour).Err()
if err != nil {
panic(err)
}
}
func ExampleClient_Incr() {
if err := client.Incr("counter").Err(); err != nil {
panic(err)
}
n, err := client.Get("counter").Int64()
fmt.Println(n, err)
// Output: 1 <nil>
}
func ExampleClient_BLPop() {
if err := client.RPush("queue", "message").Err(); err != nil {
panic(err)
}
// use `client.BLPop(0, "queue")` for infinite waiting time
result, err := client.BLPop(1*time.Second, "queue").Result()
if err != nil {
panic(err)
}
fmt.Println(result[0], result[1])
// Output: queue message
}
func ExampleClient_Scan() {
client.FlushDB()
for i := 0; i < 33; i++ {
err := client.Set(fmt.Sprintf("key%d", i), "value", 0).Err()
if err != nil {
panic(err)
}
}
var cursor uint64
var n int
for {
var keys []string
var err error
keys, cursor, err = client.Scan(cursor, "", 10).Result()
if err != nil {
panic(err)
}
n += len(keys)
if cursor == 0 {
break
}
}
fmt.Printf("found %d keys\n", n)
// Output: found 33 keys
}
func ExampleClient_Pipelined() {
var incr *redis.IntCmd
_, err := client.Pipelined(func(pipe redis.Pipeliner) error {
incr = pipe.Incr("pipelined_counter")
pipe.Expire("pipelined_counter", time.Hour)
return nil
})
fmt.Println(incr.Val(), err)
// Output: 1 <nil>
}
func ExampleClient_Pipeline() {
pipe := client.Pipeline()
incr := pipe.Incr("pipeline_counter")
pipe.Expire("pipeline_counter", time.Hour)
// Execute
//
// INCR pipeline_counter
// EXPIRE pipeline_counts 3600
//
// using one client-server roundtrip.
_, err := pipe.Exec()
fmt.Println(incr.Val(), err)
// Output: 1 <nil>
}
func ExampleClient_TxPipelined() {
var incr *redis.IntCmd
_, err := client.TxPipelined(func(pipe redis.Pipeliner) error {
incr = pipe.Incr("tx_pipelined_counter")
pipe.Expire("tx_pipelined_counter", time.Hour)
return nil
})
fmt.Println(incr.Val(), err)
// Output: 1 <nil>
}
func ExampleClient_TxPipeline() {
pipe := client.TxPipeline()
incr := pipe.Incr("tx_pipeline_counter")
pipe.Expire("tx_pipeline_counter", time.Hour)
// Execute
//
// MULTI
// INCR pipeline_counter
// EXPIRE pipeline_counts 3600
// EXEC
//
// using one client-server roundtrip.
_, err := pipe.Exec()
fmt.Println(incr.Val(), err)
// Output: 1 <nil>
}
func ExampleClient_Watch() {
var incr func(string) error
// Transactionally increments key using GET and SET commands.
incr = func(key string) error {
err := client.Watch(func(tx *redis.Tx) error {
n, err := tx.Get(key).Int64()
if err != nil && err != redis.Nil {
return err
}
_, err = tx.Pipelined(func(pipe redis.Pipeliner) error {
pipe.Set(key, strconv.FormatInt(n+1, 10), 0)
return nil
})
return err
}, key)
if err == redis.TxFailedErr {
return incr(key)
}
return err
}
var wg sync.WaitGroup
for i := 0; i < 100; i++ {
wg.Add(1)
go func() {
defer wg.Done()
err := incr("counter3")
if err != nil {
panic(err)
}
}()
}
wg.Wait()
n, err := client.Get("counter3").Int64()
fmt.Println(n, err)
// Output: 100 <nil>
}
func ExamplePubSub() {
pubsub := client.Subscribe("mychannel1")
defer pubsub.Close()
// Wait for subscription to be created before publishing message.
subscr, err := pubsub.ReceiveTimeout(time.Second)
if err != nil {
panic(err)
}
fmt.Println(subscr)
err = client.Publish("mychannel1", "hello").Err()
if err != nil {
panic(err)
}
msg, err := pubsub.ReceiveMessage()
if err != nil {
panic(err)
}
fmt.Println(msg.Channel, msg.Payload)
// Output: subscribe: mychannel1
// mychannel1 hello
}
func ExamplePubSub_Receive() {
pubsub := client.Subscribe("mychannel2")
defer pubsub.Close()
for i := 0; i < 2; i++ {
// ReceiveTimeout is a low level API. Use ReceiveMessage instead.
msgi, err := pubsub.ReceiveTimeout(time.Second)
if err != nil {
break
}
switch msg := msgi.(type) {
case *redis.Subscription:
fmt.Println("subscribed to", msg.Channel)
_, err := client.Publish("mychannel2", "hello").Result()
if err != nil {
panic(err)
}
case *redis.Message:
fmt.Println("received", msg.Payload, "from", msg.Channel)
default:
panic("unreached")
}
}
// sent message to 1 client
// received hello from mychannel2
}
func ExampleScript() {
IncrByXX := redis.NewScript(`
if redis.call("GET", KEYS[1]) ~= false then
return redis.call("INCRBY", KEYS[1], ARGV[1])
end
return false
`)
n, err := IncrByXX.Run(client, []string{"xx_counter"}, 2).Result()
fmt.Println(n, err)
err = client.Set("xx_counter", "40", 0).Err()
if err != nil {
panic(err)
}
n, err = IncrByXX.Run(client, []string{"xx_counter"}, 2).Result()
fmt.Println(n, err)
// Output: <nil> redis: nil
// 42 <nil>
}
func Example_customCommand() {
Get := func(client *redis.Client, key string) *redis.StringCmd {
cmd := redis.NewStringCmd("get", key)
client.Process(cmd)
return cmd
}
v, err := Get(client, "key_does_not_exist").Result()
fmt.Printf("%q %s", v, err)
// Output: "" redis: nil
}
func ExampleScanIterator() {
iter := client.Scan(0, "", 0).Iterator()
for iter.Next() {
fmt.Println(iter.Val())
}
if err := iter.Err(); err != nil {
panic(err)
}
}
func ExampleScanCmd_Iterator() {
iter := client.Scan(0, "", 0).Iterator()
for iter.Next() {
fmt.Println(iter.Val())
}
if err := iter.Err(); err != nil {
panic(err)
}
}
func ExampleNewUniversalClient_simple() {
client := redis.NewUniversalClient(&redis.UniversalOptions{
Addrs: []string{":6379"},
})
defer client.Close()
client.Ping()
}
func ExampleNewUniversalClient_failover() {
client := redis.NewUniversalClient(&redis.UniversalOptions{
MasterName: "master",
Addrs: []string{":26379"},
})
defer client.Close()
client.Ping()
}
func ExampleNewUniversalClient_cluster() {
client := redis.NewUniversalClient(&redis.UniversalOptions{
Addrs: []string{":7000", ":7001", ":7002", ":7003", ":7004", ":7005"},
})
defer client.Close()
client.Ping()
}