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quick_start.md

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Quick Start

Build

Download the source code through git, and then compile the cppnet static library，please refer to Build.
The header file to be referenced is defined in include, just need reference a header file.

#include "include/cppnet.h"

Use

Construct an instance of cppnet and call the Init interface for initialization, like

CppNet net;
net.Init(2);

Then set the callback notification function, like

net.SetAcceptCallback(std::bind(&HttpServer::OnConnection, &server, std::placeholders::_1, std::placeholders::_2));
net.SetWriteCallback(std::bind(&HttpServer::OnMessageSend, &server, std::placeholders::_1, std::placeholders::_2));
net.SetReadCallback(std::bind(&HttpServer::OnMessage, &server, std::placeholders::_1, std::placeholders::_2, 
                                              std::placeholders::_3));
net.SetDisconnectionCallback(std::bind(&HttpServer::OnDisConnection, &server, std::placeholders::_1, std::placeholders::_2));

Other API details, see API.
Relevant examples can be referred to test.

Best Practices

About Thread

  • On Linux and MacOS, Each received client socket will only be active in one thread, So you don't have to think about thread safety.
  • On Windows, The IOCP schedules all IO threads to wake up, The read and write of each socket is not fixed in one thread, so thread safety should be considered.
  • All network IO and callbacks are performed in child threads. Do not perform time-consuming operations in callbacks.
  • If the main thread does not have other blocking operations, call the Join interface to block and wait for the network IO thread.

Connection Context
CNSocket Provided

virtual void SetContext(void* context) = 0;
virtual void* GetContext() = 0;

connection context setting interface. It can be set in the connection request callback, obtained in the send or read callback, and destructed in the connection disconnection callback. There is no need to maintain a central data structure in the application layer.
The use process can be referred to httpser。

Socket Object
The CNSocket handle that is passed in each callback, it's life cycle is maintained by intelligent pointer internal cppnet. It is not recommended to hold it in the application layer, so as not to affect the resource release after the connection is closed.

Configure
Common configurations are defined in cppnet_config.h, The function of each configuration item can be referred to the notes.
On the Linux platform, the efficiency of opening the EPOLLEXCLUSIVE will be improved by nearly 40%(see ab bench), If the kernel version is higher than 4.5, it is recommended to enable this setting.

Multi Port
When there are multiple ports to listen on, it can be called repeatedly

bool ListenAndAccept(const std::string& ip, uint16_t port);

In the callback notification of connection establishment, through

virtual uint16_t GetListenPort() = 0;

interface gets the listening port to distinguish different services.
The use process can be referred to multi_port。