PlugCollect

Basic instrumentation library to intercept and collect Plug pipeline connection parameters for further reporting, monitoring or analysis with user provided function.

PlugCollect is inspired by other libraries:

• Appsignal.Plug,
• Sentry.PlugCapture.

Installation

Add plug_collect to your application dependencies list in mix.exs:

#mix.exs
def deps do
  [
    {:plug_collect, "~> 0.2.0"}
  ]
end

Usage

Add use PlugCollect to your application's Phoenix endpoint or router, for example:

#endpoint.ex
defmodule MyAppWeb.Endpoint do
  use PlugCollect, collectors: [&MyApp.Monitor.my_collect/2]
  use Phoenix.Endpoint, otp_app: :my_app
  # ...

Callback function MyApp.Monitor.my_collect/2 will be invoked on each request. Example my_collect/2 callback implementation:

defmodule MyApp.Monitor do
  def my_collect(_status, %Plug.Conn{assigns: assigns} = _conn),
    do: Logger.metadata(user_id: Map.get(assigns, :user_id))
end