About

This is my solution to the Redis Server coding challenge by John Crickett.

It is writen in C++23 using Clang and libstdc++ on Ubuntu. Due to some issues when using Asio with modules on msvc, I have not yet been able to make it compile on Windows, unfortunately. This is also the first time I build something more than a test program that uses modules.

State

The challenge is almost done, except for the extra commands in the second to last step. The code is a mess, but it runs well:

The following command

redis-benchmark -q -t SET,GET -k 1 -d 512 -n 100000 -c 50 -r 1000000

This server produces the following benchmark results:

SET: 49726.51 requests per second, p50=0.503 msec                   
GET: 46533.27 requests per second, p50=0.535 msec

Which is very similar to the 'real' redis server installed via apt-get:

SET: 50377.83 requests per second, p50=0.495 msec                   
GET: 47460.84 requests per second, p50=0.519 msec

TODO

• Add support for more commands (finish the challenge)
• Heavily refactor the RESP parser
• Remove the ugly string copying and hard-coded RESP responses that occur in several places
• Add support for varying request sizes in the buffer pool

Disclaimer

Naming is hard. Despite the name of this project, I am not in any way affiliated with Redis. If you are affiliated with Redis and you think the name of this project needs to change, please contact me and I will make the change.

Requirements

The code has been verified to work with clang-19 on Ubuntu (24.04). On Windows there are compilation errors that are similar to this report. The ticket is still "under consideration" after almost three years, so it's anyone's guess when it an be resolved. If you know a workaround to this on Windows, PRs are always welcome :)

Running

  ./redis-server

To see available arguments, run

  ./redis-server -h

Dependencies

This project stands on the shoulders of the following giants:

• Asio: The stand-alone version of the popular networking library
• CLI11: A command line parsing library