fcbc25e789
We are replacing the very outdated redigo Go module with the official redis Go module, go-redis. Signed-off-by: Milos Gajdos <milosthegajdos@gmail.com>
224 lines
6.8 KiB
Markdown
224 lines
6.8 KiB
Markdown
# Redis client for Go
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[](https://github.com/redis/go-redis/actions)
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[](https://pkg.go.dev/github.com/redis/go-redis/v9?tab=doc)
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[](https://redis.uptrace.dev/)
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[](https://discord.gg/rWtp5Aj)
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> go-redis is brought to you by :star: [**uptrace/uptrace**](https://github.com/uptrace/uptrace).
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> Uptrace is an open-source APM tool that supports distributed tracing, metrics, and logs. You can
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> use it to monitor applications and set up automatic alerts to receive notifications via email,
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> Slack, Telegram, and others.
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>
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> See [OpenTelemetry](example/otel) example which demonstrates how you can use Uptrace to monitor
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> go-redis.
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## Documentation
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- [English](https://redis.uptrace.dev)
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- [简体中文](https://redis.uptrace.dev/zh/)
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## Resources
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- [Discussions](https://github.com/redis/go-redis/discussions)
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- [Chat](https://discord.gg/rWtp5Aj)
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- [Reference](https://pkg.go.dev/github.com/redis/go-redis/v9)
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- [Examples](https://pkg.go.dev/github.com/redis/go-redis/v9#pkg-examples)
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## Ecosystem
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- [Redis Mock](https://github.com/go-redis/redismock)
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- [Distributed Locks](https://github.com/bsm/redislock)
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- [Redis Cache](https://github.com/go-redis/cache)
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- [Rate limiting](https://github.com/go-redis/redis_rate)
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This client also works with [Kvrocks](https://github.com/apache/incubator-kvrocks), a distributed
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key value NoSQL database that uses RocksDB as storage engine and is compatible with Redis protocol.
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## Features
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- Redis 3 commands except QUIT, MONITOR, and SYNC.
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- Automatic connection pooling with
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- [Pub/Sub](https://redis.uptrace.dev/guide/go-redis-pubsub.html).
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- [Pipelines and transactions](https://redis.uptrace.dev/guide/go-redis-pipelines.html).
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- [Scripting](https://redis.uptrace.dev/guide/lua-scripting.html).
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- [Redis Sentinel](https://redis.uptrace.dev/guide/go-redis-sentinel.html).
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- [Redis Cluster](https://redis.uptrace.dev/guide/go-redis-cluster.html).
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- [Redis Ring](https://redis.uptrace.dev/guide/ring.html).
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- [Redis Performance Monitoring](https://redis.uptrace.dev/guide/redis-performance-monitoring.html).
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- [Redis Probabilistic [RedisStack]](https://redis.io/docs/data-types/probabilistic/)
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## Installation
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go-redis supports 2 last Go versions and requires a Go version with
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[modules](https://github.com/golang/go/wiki/Modules) support. So make sure to initialize a Go
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module:
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```shell
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go mod init github.com/my/repo
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```
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Then install go-redis/**v9**:
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```shell
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go get github.com/redis/go-redis/v9
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```
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## Quickstart
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```go
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import (
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"context"
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"github.com/redis/go-redis/v9"
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"fmt"
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)
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var ctx = context.Background()
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func ExampleClient() {
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rdb := redis.NewClient(&redis.Options{
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Addr: "localhost:6379",
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Password: "", // no password set
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DB: 0, // use default DB
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})
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err := rdb.Set(ctx, "key", "value", 0).Err()
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if err != nil {
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panic(err)
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}
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val, err := rdb.Get(ctx, "key").Result()
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if err != nil {
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panic(err)
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}
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fmt.Println("key", val)
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val2, err := rdb.Get(ctx, "key2").Result()
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if err == redis.Nil {
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fmt.Println("key2 does not exist")
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} else if err != nil {
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panic(err)
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} else {
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fmt.Println("key2", val2)
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}
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// Output: key value
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// key2 does not exist
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}
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```
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The above can be modified to specify the version of the RESP protocol by adding the `protocol` option to the `Options` struct:
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```go
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rdb := redis.NewClient(&redis.Options{
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Addr: "localhost:6379",
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Password: "", // no password set
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DB: 0, // use default DB
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Protocol: 3, // specify 2 for RESP 2 or 3 for RESP 3
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})
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```
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### Connecting via a redis url
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go-redis also supports connecting via the [redis uri specification](https://github.com/redis/redis-specifications/tree/master/uri/redis.txt). The example below demonstrates how the connection can easily be configured using a string, adhering to this specification.
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```go
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import (
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"context"
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"github.com/redis/go-redis/v9"
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"fmt"
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)
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var ctx = context.Background()
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func ExampleClient() {
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url := "redis://localhost:6379?password=hello&protocol=3"
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opts, err := redis.ParseURL(url)
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if err != nil {
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panic(err)
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}
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rdb := redis.NewClient(opts)
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```
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## Look and feel
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Some corner cases:
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```go
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// SET key value EX 10 NX
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set, err := rdb.SetNX(ctx, "key", "value", 10*time.Second).Result()
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// SET key value keepttl NX
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set, err := rdb.SetNX(ctx, "key", "value", redis.KeepTTL).Result()
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// SORT list LIMIT 0 2 ASC
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vals, err := rdb.Sort(ctx, "list", &redis.Sort{Offset: 0, Count: 2, Order: "ASC"}).Result()
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// ZRANGEBYSCORE zset -inf +inf WITHSCORES LIMIT 0 2
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vals, err := rdb.ZRangeByScoreWithScores(ctx, "zset", &redis.ZRangeBy{
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Min: "-inf",
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Max: "+inf",
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Offset: 0,
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Count: 2,
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}).Result()
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// ZINTERSTORE out 2 zset1 zset2 WEIGHTS 2 3 AGGREGATE SUM
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vals, err := rdb.ZInterStore(ctx, "out", &redis.ZStore{
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Keys: []string{"zset1", "zset2"},
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Weights: []int64{2, 3}
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}).Result()
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// EVAL "return {KEYS[1],ARGV[1]}" 1 "key" "hello"
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vals, err := rdb.Eval(ctx, "return {KEYS[1],ARGV[1]}", []string{"key"}, "hello").Result()
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// custom command
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res, err := rdb.Do(ctx, "set", "key", "value").Result()
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```
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## Run the test
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go-redis will start a redis-server and run the test cases.
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The paths of redis-server bin file and redis config file are defined in `main_test.go`:
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```go
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var (
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redisServerBin, _ = filepath.Abs(filepath.Join("testdata", "redis", "src", "redis-server"))
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redisServerConf, _ = filepath.Abs(filepath.Join("testdata", "redis", "redis.conf"))
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)
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```
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For local testing, you can change the variables to refer to your local files, or create a soft link
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to the corresponding folder for redis-server and copy the config file to `testdata/redis/`:
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```shell
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ln -s /usr/bin/redis-server ./go-redis/testdata/redis/src
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cp ./go-redis/testdata/redis.conf ./go-redis/testdata/redis/
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```
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Lastly, run:
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```shell
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go test
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```
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Another option is to run your specific tests with an already running redis. The example below, tests against a redis running on port 9999.:
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```shell
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REDIS_PORT=9999 go test <your options>
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```
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## See also
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- [Golang ORM](https://bun.uptrace.dev) for PostgreSQL, MySQL, MSSQL, and SQLite
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- [Golang PostgreSQL](https://bun.uptrace.dev/postgres/)
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- [Golang HTTP router](https://bunrouter.uptrace.dev/)
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- [Golang ClickHouse ORM](https://github.com/uptrace/go-clickhouse)
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## Contributors
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Thanks to all the people who already contributed!
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<a href="https://github.com/redis/go-redis/graphs/contributors">
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<img src="https://contributors-img.web.app/image?repo=redis/go-redis" />
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</a>
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