Redis

Source code at Github

A minimal Redis-inspired TCP server using C language.

This project implements:

1. Non-blocking sockets
2. epoll-based event loop
3. Per-client state management
4. Inline command parsing (Redis-compatible style)
5. Basic command dispatch table

Flow

The server utilizes eventpoll system calls to be able to handle multiple clients the FD for server and each client is set to be nonblocking using fcntl then added to epoll instance then we accept new connections or commands through the ready epoll objects

In sequence

Read client data-> Parse commands -> Dispatch the arguments to command table -> Process command ->Write response

Features

Supports the following commands:

PING
ECHO {value}
SET key value
GET key

Testing

#compile
gcc *.c -o main

#run server
./main

#connect to the server
nc localhost 6379
PING
#the server should respond with +PONG

For windows OS

1. Replace epoll with select or IOCP

2. Replace POSIX calls with Winsock

3. Add WSAStartup

4. Change nonblocking setu