mruby-memcached

mruby-memcached lets you talk to a Memcached server from mruby code. Memcached is a popular in-memory key-value store that applications use to cache frequently accessed data, and mruby is a lightweight, embeddable version of the Ruby programming language. Without this gem, mruby wouldn't have a straightforward way to store and retrieve data in Memcached.

In practice, you connect to a Memcached server by providing its address, then use simple commands to save and fetch data. You can store a value under a key, retrieve it later by that key, and optionally set a time limit after which the data expires automatically. The library also supports connecting to multiple Memcached servers at once and creating replicas, meaning the same data gets copied across several servers so it's still available if one goes down.

Someone who would reach for this is typically building an application in mruby that needs fast, temporary data storage. For example, if you're building a lightweight web server or embedded system in mruby and want to cache session data or API responses so you don't have to recompute them every time, this library gives you that capability. The replica feature is useful when you need redundancy across multiple cache servers, so a single server failure doesn't wipe out your cached data.

The project is written in C and acts as a bridge between mruby and libmemcached, which is an established C library for communicating with Memcached servers. This approach means the gem benefits from libmemcached's maturity and performance rather than reimplementing the protocol from scratch. The README doesn't go into detail on error handling, advanced configuration, or performance characteristics beyond the basic usage examples shown.