ReDiscovery

Node service discovery using a Redis backend.

Usage

Listener

Rediscovery requires a listener. This module gets called whenever node changes are detected. The module must provide the following callbacks:

• list/0 - This returns the list of nodes that the listener knows about.
• add/1 - This receives [{node, metadata}] whenever Rediscovery detects that a node has been added.
• remove/1 - This receives [node] whenever Rediscovery detects that a node should be removed.

An example listener could look like the following:

defmoduleMyApp.ListenerdouseRediscovery.Listener@impltruedeflistdoNode.list()end@impltruedefadd(nodes)doEnum.each(nodes,fn{node,_metadata}->Node.connect(node)endend@impltruedefremove(nodes)doEnum.each(&Node.disconnect/1)endend

Supervision Tree

Add Rediscovery, followed by any Listener modules to your supervision tree (ideally near the end to make sure other processes that your app requires are started):

children=[{Rediscovery,[host: "my.redis-host.com",port: 6379,prefix: "my_app:my_environment",]},MyApp.Listener]

See lib/rediscovery.ex for other options for Rediscovery.