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Simple RPC Key Value Server using etcd/Raft in Golang

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RaftRPC: Simple RPC Key Value Server using etcd/Raft in Golang
==============

[![GoDoc](https://godoc.org/github.com/kkdai/raftrpc?status.svg)](https://godoc.org/github.com/kkdai/raftrpc)  [![Build Status](https://travis-ci.org/kkdai/raftrpc.svg?branch=master)](https://travis-ci.org/kkdai/raftrpc)

What is Raft RPC Server/Client
=============

This is a simple KV Server (Key/Value) server using [raft consensus algorithm](https://github.com/coreos/etcd). (implement by [CoreOS/etcd](https://github.com/coreos/etcd)).

It provide a basic RPC Client/Server for K/V(Key Value) storage service.

What is Raft
=============

Raft is a consensus algorithm that is designed to be easy to understand. It's equivalent to Paxos in fault-tolerance and performance. The difference is that it's decomposed into relatively independent subproblems, and it cleanly addresses all major pieces needed for practical systems. We hope Raft will make consensus available to a wider audience, and that this wider audience will be able to develop a variety of higher quality consensus-based systems than are available today. (quote from [here](https://raft.github.io/))

How to use etcd/raft in your project
=============

1. Refer code from [raftexample](https://github.com/coreos/etcd/tree/master/contrib/raftexample)
2. Get file listener.go, kvstore.go, raft.go. 
3. Do your modification for your usage.

### note
- `raft.transport` need an extra http port for raft message exchange. **MUST** add this in your code. (which is peer info in example code)

Installation and Usage
=============

Install
---------------
```
go get github.com/kkdai/raftrpc
```

Usage
---------------

### Server Example(1) Single Server:

```go
package main
    
import (
	"fmt"
    
	. "github.com/kkdai/raftrpc"
)
    
func main() {
	forever := make(chan int)

//RPC addr
	rpcAddr := "127.0.0.1:1234"
	srv := StartServer(rpcAddr, 1)

<-forever
}
```

### Server Example(2) Cluster Server:

```go
package main
    
import (
	"fmt"
    
	. "github.com/kkdai/raftrpc"
)
    
func main() {
	forever := make(chan int)
	
	//Note there are two address and port.
	//
	// "127.0.0.1:1234" is RPC access point
	// "http://127.0.0.1:12379" is raft message access point which use http
	
	var raftMsgSrvList []string
	raftMsgSrvList = append(raftMsgSrvList, "http://127.0.0.1:12379")
	raftMsgSrvList = append(raftMsgSrvList, "http://127.0.0.1:22379")

srv1 := StartClusterServers("127.0.0.1:1234", 1, raftMsgSrvList)
	srv2 := StartClusterServers("127.0.0.1:1235", 2, raftMsgSrvList)
	
	<-forever
}
```

### Client Example

Assume a server exist on `127.0.0.1:1234`.

```go
package main
    
import (
	"fmt"
    
	. "github.com/kkdai/raftrpc"
)
    
func main() {
	client := MakeClerk("127.0.0.1:1234")
	client.Put("t1", "v1")
	log.Println("got:", ret)
	if ret != "v1" {
		log.Println("Client get error:", ret)
	}
}	
```

Inspired By
---------------
- [CoreOS ETCD source code](https://github.com/coreos/etcd)
- [ETCD Example](https://github.com/coreos/etcd/tree/master/contrib/raftexample)
- [Raft: A First Implementation](http://otm.github.io/2015/05/raft-a-first-implementation/)

Project52
---------------

It is one of my [project 52](https://github.com/kkdai/project52).

License
---------------

etcd is under the Apache 2.0 [license](LICENSE). See the LICENSE file for details.

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