• Framework

Pub/Sub framework for distributed services, nodeset.core is based on Foolscap[1] RPC and twisted[2]. Each "node" is a separate unix process, and all events delivering are performed by dispatcher, the special unix process (also based on foolscap RPC).

• Features

• Distributed

• nodes and dispatcher(s) could be anywhere in network.

• Stateless

• dispatcher is completely stateless (after crash/restart the state of dispatcher will be the same as before).
• nodes share nothing between each other, and restores all subscriptions after dispatcher reconnect

• HTTP support

• nodeset-web helps to implement HTTP API based on nodeset.core pub/sub framework

• Monitoring (built in monitoring support [WiP])

• nodeset.core components:

1. dispatcher - runs on its own, just listen for incoming foolscap RPC calls, and trace which nodes are available, and its health.
2. node - Each Node can act as publisher, as well as subscribers. 2.1 node collection - group nodes under one listen port

• Install (easy_install based)

python setup.py install (or develop for development)

• Examples

There are few examples of NodeSet framework usage:

• examples/node.py - example of NodeCollection, as well as Node usage. Subscription example
• examples/mnode_publish.py - example of publishing

To run any of example, first you must run dispatcher:

• nodeset-dispatcher [options]

• Node usage example

• nodeset-node [options]
• nodeset-node publisher [options]
• nodeset-node subscriber [options]

• Web node usage example

• nodeset-web web [options]

Options for call is similar to twistd tool in twisted framework, base code was taken from twisted, just use --help to find out available options.

Links:

1. http://foolscap.lothar.com/trac
2. http://twistedmatrix.com