LifeCycleHook is a simple hook that logs each life-cycle stage of LiveView.

It is good for learning Phoenix LiveView life-cycle.

Overview

By mounting LifeCycleHook on LiveView with use LifeCycleHook, you can see logs for each life-cycle of LiveView.

defmodule MyApp.MyLive do
  use Phoenix.LiveView
  use LifeCycleHook

  @impl true
  def render(assigns) do
    ...
  end

  @impl true
  def handle_event("click", params, socket) do
    ...
  end

  @impl true
  def handle_info(:send, socket) do
    ...
  end
end

[debug] MyApp.MyLive mount connected: false
[debug] MyApp.MyLive handle_params connected: false
[debug] MyApp.MyLive mount connected: true
[debug] MyApp.MyLive handle_params connected: true

[debug] MyApp.MyLive handle_event event: click
[debug] MyApp.MyLive handle_info message: send

only/except options

If you want to choose specific stages to log, you can use only or except option in use LifeCycleHook. For example, you can set only: [:mount] option to use LifeCycleHook in sticky nested LiveView which doesn't support handle_params hook.

defmodule MyApp.MyStickyNestedLive do
  use Phoenix.LiveView
  use LifeCycleHook, only: [:mount]

  @impl true
  def render(assigns) do
    ...
  end
end

[debug] MyApp.MyStickyNestedLive mount connected: false
[debug] MyApp.MyStickyNestedLive mount connected: true

log_level option

You can change log level of LifeCycleHook with log_level option.

defmodule MyApp.MyWarnLogLevelLive do
  use Phoenix.LiveView
  use LifeCycleHook, log_level: :warn

  @impl true
  def render(assigns) do
    ...
  end
end

[warning] MyApp.MyWarnLogLevelLive mount connected: false
[warning] MyApp.MyWarnLogLevelLive mount connected: true

Installation

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

def deps do
  [
    {:life_cycle_hook, "~> 0.8"}
  ]
end