Mnemosyne

Mnemosyne is a http request caching in memory proxy API.

Status of development

All features are present, but the software is very new and not tested for production.

TODO

• allows to limit cache by size
• organize code in modules
• tracing
• tests
• documentation
• benchmarks/optimizations

Description

Mnemosyne is placed between your load balancer (ex: nginx) and your server applications that needs their requests to be cached. It will optimize the resources by caching responses and adding caching headers that will ask clients to re-use the cache locally. The cache will be expired based on activity and from manual invalidation.

Objectives

This software is meant to add caching capability to your backend service without adding any code and be agnostic about them. It must give a very good performance for common usages of websites, but will sacrifice small performance for modularity and easier maintenance if needed.

Features

• configuration file
• multiple backend service possible, based on HOST header to decide where to redirect.
• well thought expiration of cache (thanks moka)
• add etag header
• return non modified status when client has a valid etag
• takes into account Vary header from server (will save different cache object for every variation of the specified header)
• let backend service decide his own caching controls.
• admin API
  • update rules of redirection without restart or loosing current cache.
  • cache invalidation
  • update fallback
  • get raw cache content
  • get stats of cache

Usage

Configure your reverse proxy to redirect requests you want to cache on Mnemosyne.
Warning: make sure your reverse proxy does not apply unwanted modification on HOST header of your requests.
Configure at start the HOST value that will trigger a redirection to a backend service or use the administrator API of Mnemosyne to configure it at runtime.