A naive persistent key-value store for learning purposes.
PicoKV is a small and simplistic persistent key-value store made available in as an heavily commented source code file for learning purposes. It is NOT meant for production use or for storing valuable data.
However, if you are curious about how stuff like Redis, Riak or LevelDB work, this might be a nice starting point.
Start reading the code here.
What I cannot create, I do not understand. -- Richard Feynman
I was reading Designing Data-Intensive Applications by Martin Kleppmann and I wanted to learn more about the algorithms described in the book by writing a naive implementation of the simplest on-disk key-value store.
PicoKV is an implementation of the Hash Index algorithm in Chapter 3 and it resembles the approach of Bitcask.
You can use PicoKV as a library in your code, like this. Or you can run a simple HTTP server that accept GET/PUT requests on top of it with make run.
Example:
$ make run
$ curl -s -d "foobar" -H "content-type: text/plain" -X PUT http://localhost:9001/pkv/foo
OK
$ curl -s -X GET http://localhost:9001/pkv/foo
foobar
Run make test. You'll need docker.
Want more? Cool! Get a copy of Designing Data-Intensive Applications by Martin Kleppmann. It's a great book!
You can also dig into the actual source code of more comprehensive projects such as:
Hey man, this sucks... you have no clue about what you're doing!You're most likely right! Feel free to submit a pull request! 😉
The style of the tutorial is inspired by the Super Tiny Compiler and jonesforth. Check them out, they are great!