defmodule Plug.Logger do
@moduledoc """
A plug for logging basic request information in the format:
GET /index.html
Sent 200 in 572ms
To use it, just plug it into the desired module.
plug Plug.Logger, log: :debug
## Options
* `:log` - The log level at which this plug should log its request info.
Default is `:info`.
"""
require Logger
alias Plug.Conn
@behaviour Plug
def init(opts) do
Keyword.get(opts, :log, :info)
end
def call(conn, level) do
Logger.log level, fn ->
[conn.method, ?\s, conn.request_path]
end
before_time = :os.timestamp()
Conn.register_before_send(conn, fn conn ->
Logger.log level, fn ->
after_time = :os.timestamp()
diff = :timer.now_diff(after_time, before_time)
[connection_type(conn), ?\s, Integer.to_string(conn.status),
" in ", formatted_diff(diff)]
end
conn
end)
end
defp formatted_diff(diff) when diff > 1000, do: [diff |> div(1000) |> Integer.to_string, "ms"]
defp formatted_diff(diff), do: [diff |> Integer.to_string, "µs"]
defp connection_type(%{state: :chunked}), do: "Chunked"
defp connection_type(_), do: "Sent"
end