ChannelWatcher

A GenServer to monitor PIDs and run callbacks when they go down.

This is essentially a slightly improved version of Chris McCord’s answer to a StackOverflow question.

Installation

The package can be installed by adding channel_watcher to your list of dependencies in mix.exs:

def deps do
  [
    {:channel_watcher, "~> 0.1.0"}
  ]
end

Usage

Drop this in a module for a process you wish to test (such as a Phoenix channel):

:ok = ChannelWatcher.monitor(self(), {__MODULE__, CALLBACK, [ARGS]})

Make sure to replace CALLBACK with an atom of your callback function name, and [ARGS] with a list of arguments to pass to that callback.

The test also shows an example of usage.