Multi-protocol caching package management proxy

gistfile1.txt

A multi-threaded process which listens on port 80 for connections from yum, apt, npm, gem, etc.
It recognises the kind of request made (yum, apt, npm, gem) automatically and responds accordingly.

If a requested package is available locally, it is served.
If not, it is fetched from a configured list of upstream servers, cached and served.

On a regular basis, the process retreives a package list (eg, Repodata.xml) from its upstream servers,
and merges it with a list of local packages.

Users provide mappings for where to point for each repo (eg: cent 7, cent 7 updates, npm, etc). Eg:
  request_uri: /centos-7
    - upstream: http://...
    - local_dir: s3://pkgcacher.example.com/centos-7
    - daily_sync_time: 05:30
  request_uri: /gems
    - upstream: http://...
    - local_dir: /var/cache/pkgcacher/gems
    - daily_sync_time: 05:45
  s3_credentials:
    - access_key_id: ...
    - secret_access_key: ...