[Networking]Libraries & Frameworks & Tools & Documents Notes

Keywords:Networking, Libraries & Frameworks & Tools & Documents Notes, Game Server

Game Server

A cross-platform, lightweight, scalable game server framework written in C++, and support Lua Script
https://github.com/sniper00/moon

A fast,scalable,distributed game server framework for Node.js, Powered by TypeScript. 一个TypeScript写的node.js分布式游戏/应用服务器框架（原型基于pomelo）
https://github.com/node-pinus/pinus

A lightweight online game framework
https://github.com/cloudwu/skynet

single header C(99) library to implement client-server network code for games
https://github.com/nathhB/nbnet

Networking Layer

Cross-platform asynchronous I/O
https://github.com/libuv/libuv

RakNet is a cross platform, open source, C++ networking engine for game programmers.
https://github.com/facebookarchive/RakNet

High-level, multiplatform C++ network packet sniffing and crafting library.
https://github.com/mfontanini/libtins

HTTP

nginx-1.9.2源码通读分析注释，带详尽函数中文分析注释以及相关函数流程调用注释，最全面的nginx源码阅读分析中文注释，更新完毕。
https://github.com/y123456yz/reading-code-of-nginx-1.9.2

WebSocket

基于C/C++的WebSocket库
https://blog.gmem.cc/websocket-library-for-c-or-cpp

Rollback - Input Prediction

Good Game, Peace Out Rollback Network SDK
https://github.com/pond3r/ggpo

Reliable UDP

KCP - A Fast and Reliable ARQ Protocol
https://github.com/skywind3000/kcp

Lite reliable UDP library for Mono and .NET
https://github.com/RevenantX/LiteNetLib

ENet reliable UDP networking library
https://github.com/lsalzman/enet

Tunnel

A rule-based tunnel in Go.
https://github.com/Dreamacro/clash

A Tunnel which Improves your Network Quality on a High-latency Lossy Link by using Forward Error Correction, possible for All Traffics(TCP/UDP/ICMP)
https://github.com/wangyu-/UDPspeeder

Proxy

A UDP to TCP proxy server for sending HTTP requests with zero roundtrips.
https://github.com/TimeToogo/ff-proxy

Web Server

Mongoose Embedded Web Server Library - Mongoose is more than an embedded webserver. It is a multi-protocol embedded networking library with functions including TCP, HTTP client and server, WebSocket client and server, MQTT client and broker and much more.
https://github.com/cesanta/mongoose
https://www.cesanta.com/mongoose-library.html

Simple, secure & standards compliant web server for the most demanding of applications
https://github.com/uNetworking/uWebSockets

SSL

The OpenSSL Project develops and maintains the OpenSSL software - a robust, commercial-grade, full-featured toolkit for general-purpose cryptography and secure communication.
https://www.openssl.org/

Mbed TLS is a direct replacement for OpenSSL when you look at the standards.
https://tls.mbed.org/openssl-alternative

Control

clumsy makes your network condition on Windows significantly worse, but in a controlled and interactive manner.
https://github.com/jagt/clumsy

WebRTC

WebRTC is a free, open software project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.
https://webrtc.googlesource.com/

webrtc source code from chromium.
https://github.com/JumpingYang001/webrtc

A reference gradle project that let you explore WebRTC Android in Android Studio.
https://github.com/HackWebRTC/webrtc

Open WebRTC Toolkit (OWT) is an end to end audio/video communication development toolkit based on WebRTC, which is used to create high-performance, reliable, and scalable real-time communication solutions.
https://github.com/open-webrtc-toolkit

Web-based Cloud Gaming service for Retro Game
https://github.com/giongto35/cloud-game

libwebrtc binaries ( Recommended )
https://github.com/crow-misia/libwebrtc-bin

WebRTC Build Tool for iOS/Android ( Recommended )
https://github.com/shiguredo/shiguredo-webrtc-build

Google’s WebRTC implementation in a single static library.I changed some things, make it could build M70 webrtc with h264.( Recommended )
https://github.com/BeiKeJieDeLiuLangMao/libwebrtc-m70

Update WebRTC version to m72. ( Recommended )
https://github.com/cloudwebrtc/libwebrtc-build

WebRTC dynamic library wrapper for flutter desktop plugin. https://github.com/flutter-webrtc/libwebrtc

Google’s WebRTC implementation in a single static library. https://github.com/aisouard/libwebrtc

Janus WebRTC Server ( Recommended )
https://github.com/meetecho/janus-gateway

Amazon Kinesis Video Streams Webrtc SDK is for developers to install and customize realtime communication between devices and enable secure streaming of video, audio to Kinesis Video Streams.
https://github.com/awslabs/amazon-kinesis-video-streams-webrtc-sdk-c

WebRTC Android Browser Remote Pen/Touch Input (Recommended)
https://github.com/phiresky/webrtc-remote-touch-pen-input

Examples

TCP Examples

How to Code a Server and Client in C with Sockets on Linux – Code Examples
https://www.binarytides.com/server-client-example-c-sockets-linux/

[分享] Windows Socket 速查筆記
https://dangerlover9403.pixnet.net/blog/post/177100143-%5B%E5%88%86%E4%BA%AB%5D-windows-socket-%E9%80%9F%E6%9F%A5%E7%AD%86%E8%A8%98

How do I change a TCP socket to be non-blocking?
https://stackoverflow.com/a/1549344/1645289

Linux socket example:

bool InitSocket()
{
    int server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

    //set non blocking mode
    int flags  = fcntl(server_sockfd, F_GETFL, 0);
    if(fcntl(server_sockfd, F_SETFL, flags | O_NONBLOCK) != 0)
    {
        close(server_sockfd);
        return false;
    }

    //bind
    oAddr.sin_family = AF_INET;
    oAddr.sin_addr.s_addr = INADDR_ANY;
    oAddr.sin_port = htons((u_short)6666);
    if (bind(server_sockfd,(sockaddr*)&oAddr, sizeof(oAddr)) != 0)
    {
        close(server_sockfd);
        return false;
    }
    
    const int MAX_CONNECTION = 100;
    if (listen(server_sockfd, MAX_CONNECTION) != 0)
    {
        close(server_sockfd);
        return false;
    }
    return true;
}

void recv_thread()
{
    while(true)
    {
        int client_sockfd = accept(....);
        int flags = fcntl(client_sockfd, F_GETFL, 0);
        fcntl(client_sockfd, F_SETFL, flags | O_NONBLOCK);    //!!! don't use `if(fcntl(...) != 0)`;
    }
}

How to give a specific ip address to server and client?
Server side:

// Error checking omitted for expository purposes
int sockfd = socket(AF_INET, SOCK_STREAM, 0);

// Bind to a specific network interface (and optionally a specific local port)
struct sockaddr_in localaddr;
localaddr.sin_family = AF_INET;
localaddr.sin_addr.s_addr = inet_addr("192.168.1.100");
localaddr.sin_port = 0;  // Any local port will do
bind(sockfd, (struct sockaddr *)&localaddr, sizeof(localaddr));

Client side:

// Connect to the remote server
struct sockaddr_in remoteaddr;
remoteaddr.sin_family = AF_INET;
remoteaddr.sin_addr.s_addr = inet_addr(server_ip);
remoteaddr.sin_port = htons(server_port);
connect(sockfd, (struct sockaddr *)&remoteaddr, sizeof(remoteaddr));

Related:
https://stackoverflow.com/a/15674804/1645289

Detecting TCP Client Disconnect

There is also only one reliable way to detect a broken connection: by writing to it. After enough writes to a broken connection, TCP will have done enough retries and timeouts to know that it's broken and will eventually cause write()/send()/sendXXX() to return -1 with an errno/WSAGetLastError() value of ECONNRESET, or in some cases 'connection timed out'. Note that the latter is different from 'connect timeout', which can occur in the connect phase.

Releated: https://stackoverflow.com/a/17665015/1645289

Issues

WebSocket Issues: error on reading from skt : 10054

Error code on server:

error on reading from skt : 10054

Caused by:
Client disconnected from server.

Benchmark

WebSocket vs. TCP

Blogs

TCP Block

BBR, the new kid on the TCP block
https://blog.apnic.net/2017/05/09/bbr-new-kid-tcp-block/

TCP 拥塞避免算法
https://www.toutiao.com/i6829857789427319307/

Optimization

Online Gaming

Online Gaming Explained: Why Netcode Goes Wrong + How To Improve Performance [Sponsored]
https://www.youtube.com/watch?v=S2CU0HKpYTU

Is man merely a mistake of God's? Or God merely a mistake of man? ― Friedrich Nietzsche