Imgo

Imgo is a distributed and high performance push server written in golang based on goim. compared to goim,it added offline message support,add will support IM server later on.

Features

• Light weight and high performance
• Supports single push, multiple push and broadcasting
• Supports one key to multiple subscribers (Configurable maximum subscribers count)
• Supports authentication (Unauthenticated user can't subscribe)
• Supports multiple protocols (WebSocket，TCP）
• Supports offline message (you can push even if user is not online)
• Scalable architecture (Unlimited dynamic comet,logic,router,job modules)
• Asynchronous push notification based on Kafka

Architecture

Client connect to server:

A client wants to subscribe a channel on comet through tcp or websocket,comet tells logic: "Here comes a guy,shall I keep a connection with him ?".

Logic take the token from comet and showed it to store: "Is this token valid? If it is,tell me the user id".

Logic got the user id,told router this user is online and keeps a connection with that comet,and told comet:"yes, you shall".

Then comet keeps connect to that client,and matains a heartbeat with him.

Logic knowed that comet and client was keep a connection, he ask store:"Is there any offline message of that user ?","yes,three of it",store answered and gave these to logic.

Logic packed the message into an envelope and thrown to kafka.

Job found a new envelope in kafka,fetch it and read the address:"comet 1,user 123456",then he told comet 1:"tell this to user 123456".

At last,comet told this message to user 123456.

Server push message to client:

Caller(usually a bussiness system) tells logic:"I want to send hello to a person,his user id is 123456".

Logic got the user id,ask router:"Is user 123456 online ?","yes,he is keeping a connection with comet 1" router replied.

Logic packed the message into an envelope and thrown to kafka.

Job found a new envelope in kafka,fetch it and read the address:"comet 1,user 123456",then he told comet 1:"tell this to user 123456".

At last,Comet told this message to user 123456.

Protocol:

proto

Document

中文

Examples

Websocket: Websocket Client Demo

Java: Java

Benchmark

Benchmark Server

Benchmark Case

• Online: 1,000,000
• Duration: 15min
• Push Speed: 40/s (broadcast room)
• Push Message: {"test":1}
• Received calc mode: 1s per times, total 30 times

Benchmark Resource

• CPU: 2000%~2300%
• Memory: 14GB
• GC Pause: 504ms
• Network: Incoming(450MBit/s), Outgoing(4.39GBit/s)

Benchmark Result

• Received: 35,900,000/s

中文

English

LICENSE

imgo is is distributed under the terms of the MIT License.