Godist

– Transmission control protocol (TCP) distribution

|      | --TCP--> |      | --TCP--> |       |
|Client|          |Godist|          |Service|
|      | <--TCP-- |      | <--TCP-- |       |

Godist distributes your incoming tcp connections between servers, balancing the load. A thin high-performance layer between your servers and the world.

Written in Go. Built for concurrency.

Architecture

Godist spawn 1 new Goroutine for each incomming connection, the "handler".

Incomming
connections
    ->              -> New handler (TCP conn)
    ->       Server -> New handler (TCP conn)
    ->              -> New handler (TCP conn)

The Goroutine then connect to a server based on the clients ip, it then spawns 2 more Goroutines to pass data recieved from the client going to the server, and the response from the server going to the client.

         -> passData from:client to:server
Handler |
         -> passData from:server to:client

One incomming connection requires 3 Goroutines and 2 file descriptors (FD).

The buffer size for each "passData" is set at 2048 bytes.

Usage

Godist requires a configuration file to setup the most basic settings. The software will look for godist.conf by default. You can specify your own configuration file by passing it as an argument.

godist.conf

{
	"Host": "localhost:8080",
	"Servers":
		["localhost:4000", 
		 "localhost:4001",
		 "localhost:4002"]
}

Then:

$ godist godist.conf

Distributing connections

The incoming connections are distributed by hashing the ip and port. An ip and port will always get the same server handling its connection.

Build & Install

Godist is exceptionally easy to build and install. Just clone the repo and execute one of the following commands.

$ go build

Will get you a ./godist binary.

$ go install

Installs the godist binary to your GOPATH/bin.

$ go run main.go

Useful during debug.

Contributing

Pull requests, issues, and comments are greatly appreciated.

License

Godist is licensed under the MIT license, see the LICENSE file.