Redis client for Golang

Supports:

• Redis 3 commands except QUIT, MONITOR, SLOWLOG and SYNC.
• Automatic connection pooling with circuit breaker support.
• Pub/Sub.
• Transactions.
• Pipeline and TxPipeline.
• Scripting.
• Timeouts.
• Redis Sentinel.
• Redis Cluster.
• Cluster of Redis Servers without using cluster mode and Redis Sentinel.
• Ring.
• Instrumentation.
• Cache friendly.
• Rate limiting.
• Distributed Locks.

Installation

Install:

go get -u github.com/nexsoftgit/go-redis

Import:

import "github.com/nexsoftgit/go-redis"

Quickstart

func ExampleNewClient() {
	opts := &redis.Options{
		CircuitBreaker: optCB,
		Addr:     "localhost:6379",
		Password: "", // no password set
		DB:       0,  // use default DB
	}

	client := redis.NewClient(opts)

	pong, err := client.Ping().Result()
	fmt.Println(pong, err)
	// Output: PONG <nil>
}

With Circuit Breaker

func WithCircuitBreaker() {
	
	optCB := &hystrix.CommandConfig{
		Timeout:                10000,
		RequestVolumeThreshold: 2,
		SleepWindow:            500,
		ErrorPercentThreshold:  5,
	}
	// Please, read more about command config in hystrix-go doc.
	//https://godoc.org/github.com/afex/hystrix-go/hystrix#pkg-variables)

	opts := &redis.Options{
		CircuitBreaker: optCB,
		Addr:     "localhost:6379",
		Password: "", // no password set
		DB:       0,  // use default DB
	}

	client := redis.NewClient(opts)

	pong, err := client.Ping().Result()
	fmt.Println(pong, err)
	// Output: PONG <nil>
}

Any changes in breaker state will generate metrics for monitoring. Below is a list of the metrics.

Name: "circuit_breaker"
Help: "A total number of redis client make a request to redis server with circuit breaker state."
Labels: 
	- command : "redis command" 
	- service : "service name"
	- status : "fail/ok"
	- state: 
		- "circuit breaker open": A total number of circuit breaker state open. This happens due to the circuit being measured as unhealthy.
		- "max_concurency": A total number of client executed at the same time and exceeded max concurrency.
		- "timeout": A total number of request exceeded timeout duration

Howto

Please go through examples to get an idea how to use this package.

Look and feel

Some corner cases:

SET key value EX 10 NX
set, err := client.SetNX("key", "value", 10*time.Second).Result()

SORT list LIMIT 0 2 ASC
vals, err := client.Sort("list", redis.Sort{Offset: 0, Count: 2, Order: "ASC"}).Result()

ZRANGEBYSCORE zset -inf +inf WITHSCORES LIMIT 0 2
vals, err := client.ZRangeByScoreWithScores("zset", redis.ZRangeBy{
    Min: "-inf",
    Max: "+inf",
    Offset: 0,
    Count: 2,
}).Result()

ZINTERSTORE out 2 zset1 zset2 WEIGHTS 2 3 AGGREGATE SUM
vals, err := client.ZInterStore("out", redis.ZStore{Weights: []int64{2, 3}}, "zset1", "zset2").Result()

EVAL "return {KEYS[1],ARGV[1]}" 1 "key" "hello"
vals, err := client.Eval("return {KEYS[1],ARGV[1]}", []string{"key"}, "hello").Result()

Benchmark

go-redis vs redigo:

BenchmarkSetGoRedis10Conns64Bytes-4 	  200000	      7621 ns/op	     210 B/op	       6 allocs/op
BenchmarkSetGoRedis100Conns64Bytes-4	  200000	      7554 ns/op	     210 B/op	       6 allocs/op
BenchmarkSetGoRedis10Conns1KB-4     	  200000	      7697 ns/op	     210 B/op	       6 allocs/op
BenchmarkSetGoRedis100Conns1KB-4    	  200000	      7688 ns/op	     210 B/op	       6 allocs/op
BenchmarkSetGoRedis10Conns10KB-4    	  200000	      9214 ns/op	     210 B/op	       6 allocs/op
BenchmarkSetGoRedis100Conns10KB-4   	  200000	      9181 ns/op	     210 B/op	       6 allocs/op
BenchmarkSetGoRedis10Conns1MB-4     	    2000	    583242 ns/op	    2337 B/op	       6 allocs/op
BenchmarkSetGoRedis100Conns1MB-4    	    2000	    583089 ns/op	    2338 B/op	       6 allocs/op
BenchmarkSetRedigo10Conns64Bytes-4  	  200000	      7576 ns/op	     208 B/op	       7 allocs/op
BenchmarkSetRedigo100Conns64Bytes-4 	  200000	      7782 ns/op	     208 B/op	       7 allocs/op
BenchmarkSetRedigo10Conns1KB-4      	  200000	      7958 ns/op	     208 B/op	       7 allocs/op
BenchmarkSetRedigo100Conns1KB-4     	  200000	      7725 ns/op	     208 B/op	       7 allocs/op
BenchmarkSetRedigo10Conns10KB-4     	  100000	     18442 ns/op	     208 B/op	       7 allocs/op
BenchmarkSetRedigo100Conns10KB-4    	  100000	     18818 ns/op	     208 B/op	       7 allocs/op
BenchmarkSetRedigo10Conns1MB-4      	    2000	    668829 ns/op	     226 B/op	       7 allocs/op
BenchmarkSetRedigo100Conns1MB-4     	    2000	    679542 ns/op	     226 B/op	       7 allocs/op

Redis Cluster:

BenchmarkRedisPing-4                	  200000	      6983 ns/op	     116 B/op	       4 allocs/op
BenchmarkRedisClusterPing-4         	  100000	     11535 ns/op	     117 B/op	       4 allocs/op

See also

• Golang PostgreSQL ORM
• Golang msgpack
• Golang message task queue