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Redis-Based Message Broker for Python

Project description

Latest Travis CI build status Documentation Status

Documentation: Read the docs.

Quickstart

$ pip install rivulet

Notes

Limitations

  • No balanced consumers (yet)
  • Without the proper management tools (see todos), managing messages is painful raw redis.

Todos

  • Extend testing
    • Connection drops
    • Parallel producers, consumers (stressing the locking setup)
  • Provies management functionality
    • list channels, delete channels
    • count, list, update subscribers
    • count, list, prune messages

Implementation details

Data model:

  1. rvl:lock:<channel_id>: Used to maintain locks across multi-step redis calls (in particular when sending a message using a server-issued, monotonically increasing message seq id).
  2. rvl:id:<channel_id>: A counter providing sequence ids for messages in channel channel_id
  3. rvl:msg:<channel_id>: ZSET that maps a packed JSON string to the message sed id (allowing range queries on messages over seq ids).
  4. rvl:channel:<channel_id>: ZSET that maps a client id to the last message id in channel channel_id seen by the clinet
  5. rvl:index:<client_id>: ZSET that maps the channel_id to the last message id seen by client client_id

Project details


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