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Diffstat (limited to 'dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/example_test.go')
-rw-r--r-- | dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/example_test.go | 634 |
1 files changed, 634 insertions, 0 deletions
diff --git a/dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/example_test.go b/dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/example_test.go new file mode 100644 index 0000000..f015809 --- /dev/null +++ b/dependencies/pkg/mod/github.com/go-redis/redis/v8@v8.11.5/example_test.go @@ -0,0 +1,634 @@ +package redis_test + +import ( + "context" + "errors" + "fmt" + "sync" + "time" + + "github.com/go-redis/redis/v8" +) + +var ( + ctx = context.Background() + rdb *redis.Client +) + +func init() { + rdb = redis.NewClient(&redis.Options{ + Addr: ":6379", + DialTimeout: 10 * time.Second, + ReadTimeout: 30 * time.Second, + WriteTimeout: 30 * time.Second, + PoolSize: 10, + PoolTimeout: 30 * time.Second, + }) +} + +func ExampleNewClient() { + rdb := redis.NewClient(&redis.Options{ + Addr: "localhost:6379", // use default Addr + Password: "", // no password set + DB: 0, // use default DB + }) + + pong, err := rdb.Ping(ctx).Result() + fmt.Println(pong, err) + // Output: PONG <nil> +} + +func ExampleParseURL() { + opt, err := redis.ParseURL("redis://:qwerty@localhost:6379/1?dial_timeout=5s") + if err != nil { + panic(err) + } + fmt.Println("addr is", opt.Addr) + fmt.Println("db is", opt.DB) + fmt.Println("password is", opt.Password) + fmt.Println("dial timeout is", opt.DialTimeout) + + // Create client as usually. + _ = redis.NewClient(opt) + + // Output: addr is localhost:6379 + // db is 1 + // password is qwerty + // dial timeout is 5s +} + +func ExampleNewFailoverClient() { + // See http://redis.io/topics/sentinel for instructions how to + // setup Redis Sentinel. + rdb := redis.NewFailoverClient(&redis.FailoverOptions{ + MasterName: "master", + SentinelAddrs: []string{":26379"}, + }) + rdb.Ping(ctx) +} + +func ExampleNewClusterClient() { + // See http://redis.io/topics/cluster-tutorial for instructions + // how to setup Redis Cluster. + rdb := redis.NewClusterClient(&redis.ClusterOptions{ + Addrs: []string{":7000", ":7001", ":7002", ":7003", ":7004", ":7005"}, + }) + rdb.Ping(ctx) +} + +// Following example creates a cluster from 2 master nodes and 2 slave nodes +// without using cluster mode or Redis Sentinel. +func ExampleNewClusterClient_manualSetup() { + // clusterSlots returns cluster slots information. + // It can use service like ZooKeeper to maintain configuration information + // and Cluster.ReloadState to manually trigger state reloading. + clusterSlots := func(ctx context.Context) ([]redis.ClusterSlot, error) { + slots := []redis.ClusterSlot{ + // First node with 1 master and 1 slave. + { + Start: 0, + End: 8191, + Nodes: []redis.ClusterNode{{ + Addr: ":7000", // master + }, { + Addr: ":8000", // 1st slave + }}, + }, + // Second node with 1 master and 1 slave. + { + Start: 8192, + End: 16383, + Nodes: []redis.ClusterNode{{ + Addr: ":7001", // master + }, { + Addr: ":8001", // 1st slave + }}, + }, + } + return slots, nil + } + + rdb := redis.NewClusterClient(&redis.ClusterOptions{ + ClusterSlots: clusterSlots, + RouteRandomly: true, + }) + rdb.Ping(ctx) + + // ReloadState reloads cluster state. It calls ClusterSlots func + // to get cluster slots information. + rdb.ReloadState(ctx) +} + +func ExampleNewRing() { + rdb := redis.NewRing(&redis.RingOptions{ + Addrs: map[string]string{ + "shard1": ":7000", + "shard2": ":7001", + "shard3": ":7002", + }, + }) + rdb.Ping(ctx) +} + +func ExampleClient() { + err := rdb.Set(ctx, "key", "value", 0).Err() + if err != nil { + panic(err) + } + + val, err := rdb.Get(ctx, "key").Result() + if err != nil { + panic(err) + } + fmt.Println("key", val) + + val2, err := rdb.Get(ctx, "missing_key").Result() + if err == redis.Nil { + fmt.Println("missing_key does not exist") + } else if err != nil { + panic(err) + } else { + fmt.Println("missing_key", val2) + } + // Output: key value + // missing_key does not exist +} + +func ExampleConn() { + conn := rdb.Conn(context.Background()) + + err := conn.ClientSetName(ctx, "foobar").Err() + if err != nil { + panic(err) + } + + // Open other connections. + for i := 0; i < 10; i++ { + go rdb.Ping(ctx) + } + + s, err := conn.ClientGetName(ctx).Result() + if err != nil { + panic(err) + } + fmt.Println(s) + // Output: foobar +} + +func ExampleClient_Set() { + // Last argument is expiration. Zero means the key has no + // expiration time. + err := rdb.Set(ctx, "key", "value", 0).Err() + if err != nil { + panic(err) + } + + // key2 will expire in an hour. + err = rdb.Set(ctx, "key2", "value", time.Hour).Err() + if err != nil { + panic(err) + } +} + +func ExampleClient_SetEX() { + err := rdb.SetEX(ctx, "key", "value", time.Hour).Err() + if err != nil { + panic(err) + } +} + +func ExampleClient_Incr() { + result, err := rdb.Incr(ctx, "counter").Result() + if err != nil { + panic(err) + } + + fmt.Println(result) + // Output: 1 +} + +func ExampleClient_BLPop() { + if err := rdb.RPush(ctx, "queue", "message").Err(); err != nil { + panic(err) + } + + // use `rdb.BLPop(0, "queue")` for infinite waiting time + result, err := rdb.BLPop(ctx, 1*time.Second, "queue").Result() + if err != nil { + panic(err) + } + + fmt.Println(result[0], result[1]) + // Output: queue message +} + +func ExampleClient_Scan() { + rdb.FlushDB(ctx) + for i := 0; i < 33; i++ { + err := rdb.Set(ctx, 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 = rdb.Scan(ctx, cursor, "key*", 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_ScanType() { + rdb.FlushDB(ctx) + for i := 0; i < 33; i++ { + err := rdb.Set(ctx, 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 = rdb.ScanType(ctx, cursor, "key*", 10, "string").Result() + if err != nil { + panic(err) + } + n += len(keys) + if cursor == 0 { + break + } + } + + fmt.Printf("found %d keys\n", n) + // Output: found 33 keys +} + +// ExampleStringStringMapCmd_Scan shows how to scan the results of a map fetch +// into a struct. +func ExampleStringStringMapCmd_Scan() { + rdb.FlushDB(ctx) + err := rdb.HMSet(ctx, "map", + "name", "hello", + "count", 123, + "correct", true).Err() + if err != nil { + panic(err) + } + + // Get the map. The same approach works for HmGet(). + res := rdb.HGetAll(ctx, "map") + if res.Err() != nil { + panic(err) + } + + type data struct { + Name string `redis:"name"` + Count int `redis:"count"` + Correct bool `redis:"correct"` + } + + // Scan the results into the struct. + var d data + if err := res.Scan(&d); err != nil { + panic(err) + } + + fmt.Println(d) + // Output: {hello 123 true} +} + +// ExampleSliceCmd_Scan shows how to scan the results of a multi key fetch +// into a struct. +func ExampleSliceCmd_Scan() { + rdb.FlushDB(ctx) + err := rdb.MSet(ctx, + "name", "hello", + "count", 123, + "correct", true).Err() + if err != nil { + panic(err) + } + + res := rdb.MGet(ctx, "name", "count", "empty", "correct") + if res.Err() != nil { + panic(err) + } + + type data struct { + Name string `redis:"name"` + Count int `redis:"count"` + Correct bool `redis:"correct"` + } + + // Scan the results into the struct. + var d data + if err := res.Scan(&d); err != nil { + panic(err) + } + + fmt.Println(d) + // Output: {hello 123 true} +} + +func ExampleClient_Pipelined() { + var incr *redis.IntCmd + _, err := rdb.Pipelined(ctx, func(pipe redis.Pipeliner) error { + incr = pipe.Incr(ctx, "pipelined_counter") + pipe.Expire(ctx, "pipelined_counter", time.Hour) + return nil + }) + fmt.Println(incr.Val(), err) + // Output: 1 <nil> +} + +func ExampleClient_Pipeline() { + pipe := rdb.Pipeline() + + incr := pipe.Incr(ctx, "pipeline_counter") + pipe.Expire(ctx, "pipeline_counter", time.Hour) + + // Execute + // + // INCR pipeline_counter + // EXPIRE pipeline_counts 3600 + // + // using one rdb-server roundtrip. + _, err := pipe.Exec(ctx) + fmt.Println(incr.Val(), err) + // Output: 1 <nil> +} + +func ExampleClient_TxPipelined() { + var incr *redis.IntCmd + _, err := rdb.TxPipelined(ctx, func(pipe redis.Pipeliner) error { + incr = pipe.Incr(ctx, "tx_pipelined_counter") + pipe.Expire(ctx, "tx_pipelined_counter", time.Hour) + return nil + }) + fmt.Println(incr.Val(), err) + // Output: 1 <nil> +} + +func ExampleClient_TxPipeline() { + pipe := rdb.TxPipeline() + + incr := pipe.Incr(ctx, "tx_pipeline_counter") + pipe.Expire(ctx, "tx_pipeline_counter", time.Hour) + + // Execute + // + // MULTI + // INCR pipeline_counter + // EXPIRE pipeline_counts 3600 + // EXEC + // + // using one rdb-server roundtrip. + _, err := pipe.Exec(ctx) + fmt.Println(incr.Val(), err) + // Output: 1 <nil> +} + +func ExampleClient_Watch() { + const maxRetries = 1000 + + // Increment transactionally increments key using GET and SET commands. + increment := func(key string) error { + // Transactional function. + txf := func(tx *redis.Tx) error { + // Get current value or zero. + n, err := tx.Get(ctx, key).Int() + if err != nil && err != redis.Nil { + return err + } + + // Actual opperation (local in optimistic lock). + n++ + + // Operation is committed only if the watched keys remain unchanged. + _, err = tx.TxPipelined(ctx, func(pipe redis.Pipeliner) error { + pipe.Set(ctx, key, n, 0) + return nil + }) + return err + } + + for i := 0; i < maxRetries; i++ { + err := rdb.Watch(ctx, txf, key) + if err == nil { + // Success. + return nil + } + if err == redis.TxFailedErr { + // Optimistic lock lost. Retry. + continue + } + // Return any other error. + return err + } + + return errors.New("increment reached maximum number of retries") + } + + var wg sync.WaitGroup + for i := 0; i < 100; i++ { + wg.Add(1) + go func() { + defer wg.Done() + + if err := increment("counter3"); err != nil { + fmt.Println("increment error:", err) + } + }() + } + wg.Wait() + + n, err := rdb.Get(ctx, "counter3").Int() + fmt.Println("ended with", n, err) + // Output: ended with 100 <nil> +} + +func ExamplePubSub() { + pubsub := rdb.Subscribe(ctx, "mychannel1") + + // Wait for confirmation that subscription is created before publishing anything. + _, err := pubsub.Receive(ctx) + if err != nil { + panic(err) + } + + // Go channel which receives messages. + ch := pubsub.Channel() + + // Publish a message. + err = rdb.Publish(ctx, "mychannel1", "hello").Err() + if err != nil { + panic(err) + } + + time.AfterFunc(time.Second, func() { + // When pubsub is closed channel is closed too. + _ = pubsub.Close() + }) + + // Consume messages. + for msg := range ch { + fmt.Println(msg.Channel, msg.Payload) + } + + // Output: mychannel1 hello +} + +func ExamplePubSub_Receive() { + pubsub := rdb.Subscribe(ctx, "mychannel2") + defer pubsub.Close() + + for i := 0; i < 2; i++ { + // ReceiveTimeout is a low level API. Use ReceiveMessage instead. + msgi, err := pubsub.ReceiveTimeout(ctx, time.Second) + if err != nil { + break + } + + switch msg := msgi.(type) { + case *redis.Subscription: + fmt.Println("subscribed to", msg.Channel) + + _, err := rdb.Publish(ctx, "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 rdb + // 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(ctx, rdb, []string{"xx_counter"}, 2).Result() + fmt.Println(n, err) + + err = rdb.Set(ctx, "xx_counter", "40", 0).Err() + if err != nil { + panic(err) + } + + n, err = IncrByXX.Run(ctx, rdb, []string{"xx_counter"}, 2).Result() + fmt.Println(n, err) + + // Output: <nil> redis: nil + // 42 <nil> +} + +func Example_customCommand() { + Get := func(ctx context.Context, rdb *redis.Client, key string) *redis.StringCmd { + cmd := redis.NewStringCmd(ctx, "get", key) + rdb.Process(ctx, cmd) + return cmd + } + + v, err := Get(ctx, rdb, "key_does_not_exist").Result() + fmt.Printf("%q %s", v, err) + // Output: "" redis: nil +} + +func Example_customCommand2() { + v, err := rdb.Do(ctx, "get", "key_does_not_exist").Text() + fmt.Printf("%q %s", v, err) + // Output: "" redis: nil +} + +func ExampleScanIterator() { + iter := rdb.Scan(ctx, 0, "", 0).Iterator() + for iter.Next(ctx) { + fmt.Println(iter.Val()) + } + if err := iter.Err(); err != nil { + panic(err) + } +} + +func ExampleScanCmd_Iterator() { + iter := rdb.Scan(ctx, 0, "", 0).Iterator() + for iter.Next(ctx) { + fmt.Println(iter.Val()) + } + if err := iter.Err(); err != nil { + panic(err) + } +} + +func ExampleNewUniversalClient_simple() { + rdb := redis.NewUniversalClient(&redis.UniversalOptions{ + Addrs: []string{":6379"}, + }) + defer rdb.Close() + + rdb.Ping(ctx) +} + +func ExampleNewUniversalClient_failover() { + rdb := redis.NewUniversalClient(&redis.UniversalOptions{ + MasterName: "master", + Addrs: []string{":26379"}, + }) + defer rdb.Close() + + rdb.Ping(ctx) +} + +func ExampleNewUniversalClient_cluster() { + rdb := redis.NewUniversalClient(&redis.UniversalOptions{ + Addrs: []string{":7000", ":7001", ":7002", ":7003", ":7004", ":7005"}, + }) + defer rdb.Close() + + rdb.Ping(ctx) +} + +func ExampleClient_SlowLogGet() { + const key = "slowlog-log-slower-than" + + old := rdb.ConfigGet(ctx, key).Val() + rdb.ConfigSet(ctx, key, "0") + defer rdb.ConfigSet(ctx, key, old[1].(string)) + + if err := rdb.Do(ctx, "slowlog", "reset").Err(); err != nil { + panic(err) + } + + rdb.Set(ctx, "test", "true", 0) + + result, err := rdb.SlowLogGet(ctx, -1).Result() + if err != nil { + panic(err) + } + fmt.Println(len(result)) + // Output: 2 +} |