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https://github.com/bsm/redeo

High-performance framework for building redis-protocol compatible TCP servers/services
https://github.com/bsm/redeo

go low-latency redis rpc service

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High-performance framework for building redis-protocol compatible TCP servers/services

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# Redeo

[![Go Reference](https://pkg.go.dev/badge/github.com/bsm/redeo/v2)](https://pkg.go.dev/github.com/bsm/redeo/v2)
[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)

The high-performance Swiss Army Knife for building redis-protocol compatible servers/services.

## Parts

This repository is organised into multiple components:

* [root](./) package contains the framework for building redis-protocol compatible,
high-performance servers.
* [resp](./resp/) implements low-level primitives for dealing with
RESP (REdis Serialization Protocol), client and server-side. It
contains basic wrappers for readers and writers to read/write requests and
responses.
* [client](./client/) contains a minimalist pooled client.

For full documentation and examples, please see the individual packages and the
official API documentation: https://godoc.org/github.com/bsm/redeo.

## Examples

A simple server example with two commands:

```go
package main

import (
"net"

"github.com/bsm/redeo/v2"
)

func main() {
srv := redeo.NewServer(nil)

// Define handlers
srv.HandleFunc("ping", func(w resp.ResponseWriter, _ *resp.Command) {
w.AppendInlineString("PONG")
})
srv.HandleFunc("info", func(w resp.ResponseWriter, _ *resp.Command) {
w.AppendBulkString(srv.Info().String())
})

// More handlers; demo usage of redeo.WrapperFunc
srv.Handle("echo", redeo.WrapperFunc(func(c *resp.Command) interface{} {
if c.ArgN() != 1 {
return redeo.ErrWrongNumberOfArgs(c.Name)
}
return c.Arg(0)
}))

// Open a new listener
lis, err := net.Listen("tcp", ":9736")
if err != nil {
panic(err)
}
defer lis.Close()

// Start serving (blocking)
srv.Serve(lis)
}
```

More complex handlers:

```go
func main() {
mu := sync.RWMutex{}
data := make(map[string]string)
srv := redeo.NewServer(nil)

srv.HandleFunc("set", func(w resp.ResponseWriter, c *resp.Command) {
if c.ArgN() != 2 {
w.AppendError(redeo.WrongNumberOfArgs(c.Name))
return
}

key := c.Arg(0).String()
val := c.Arg(1).String()

mu.Lock()
data[key] = val
mu.Unlock()

w.AppendInt(1)
})

srv.HandleFunc("get", func(w resp.ResponseWriter, c *resp.Command) {
if c.ArgN() != 1 {
w.AppendError(redeo.WrongNumberOfArgs(c.Name))
return
}

key := c.Arg(0).String()
mu.RLock()
val, ok := data[key]
mu.RUnlock()

if ok {
w.AppendBulkString(val)
return
}
w.AppendNil()
})
}
```

Redeo also supports command wrappers:

```go
func main() {
mu := sync.RWMutex{}
data := make(map[string]string)
srv := redeo.NewServer(nil)

srv.Handle("set", redeo.WrapperFunc(func(c *resp.Command) interface{} {
if c.ArgN() != 2 {
return redeo.ErrWrongNumberOfArgs(c.Name)
}

key := c.Arg(0).String()
val := c.Arg(1).String()

mu.Lock()
data[key] = val
mu.Unlock()

return 1
}))

srv.Handle("get", redeo.WrapperFunc(func(c *resp.Command) interface{} {
if c.ArgN() != 1 {
return redeo.ErrWrongNumberOfArgs(c.Name)
}

key := c.Arg(0).String()
mu.RLock()
val, ok := data[key]
mu.RUnlock()

if ok {
return val
}
return nil
}))
}
```