SafetyTcpConn - A Epoll TCP Server Library with Connection Safety

What is "Connection Safety" means?

1. Thread-Safety Design
   • using mutex protect the connection recv buffer and send buffer
   • using mutex protect the fd to connection map
   • using atomic_bool prevent close(fd) multiple times
2. Fair Usage Policy
   • set quota for send counters per connection
     • quota : 10
   • set the maximum number of bytes sent by each sending process
     • max sending bytes : 1500
3. Detect Undetectable Disconnections (e.g.: power outage / vpn disconnection)
   1. detect unsendable connection with non-blocking mode when sending
   2. leave it for 5 seconds, if it go back to sendable state, then keep send
   3. if connection still unsendable state after 5 seconds, then close it

Installation

This is a header-only library.

Clone this repo and copy include/* to /usr/local/include/.

# clone this repo
git clone https://github.com/KingsFourze/SafetyTcpConn.git

# copy library to include folder
cd SafetyTcpConn
sudo cp include/* /usr/local/include/ -r

Or you can include by using CMakeLists.txt by:

include_directories([path_to_library])

Usage

See demo/main.cpp

Test Enviroment

• Ubuntu 22.04 LTS (WSL)
• GCC Version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04)
• GDB Version 12.1 (Ubuntu 12.1-0ubuntu1~22.04)
• CPython 3.12.2