Spry

Spry is a helper for Elixir's IEx.pry().

Spry was born out of annoyance at the state of debugging Elixir when lots of processes are interacting - a pry session would be interrupted and messed up by timeouts and other processes spewing garbage into the console, particularly for LiveView applications with background processes.

Spry works by suspending every other process it can before prying, then resuming those processes once the IEX session is over. For example, in a LiveView application, if another client requests a page while a spry session is open, the page won't render until the session is over.

Status

Alpha! This project is in development. It's a debugging tool and shouldn't be used in production anyway.

Installation

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

def deps do
  [
    {:spry, "~> 0.2.1"}
  ]
end

Usage

Note: If using Phoenix, you must start your server with iex -S mix phx.server

Usage is simple:

require Spry
Spry.spry()

However, you probably don't want to use it this way because the context will be wrong. Instead, do this:

require IEx
require Spry
suspended = Spry.suspend()
IEx.pry()
Spry.resume(suspended)

If there are things you want to exclude from suspension, can exclude them by name or PID:

require Spry
Spry.suspend(%{exclude: ["important_process", other_important_process_pid]})

TODO

Test in multi-node (Horde) environment
Figure out how to bypass that goddamn Allow? interrogation.

License

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.