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prometheus_plugs

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Prometheus monitoring system client Plugs. Http metrics collector and exporter.

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prometheus_plugs lib plug prometheus_exporter.ex
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lib/plug/prometheus_exporter.ex 

defmodule Plug.PrometheusExporter do

  @moduledoc """

  Exports metrics in text format via configurable endpoint:

  ``` elixir

  plug Plug.PrometheusExporter, [path: "/prom/metrics"]  # default is /metrics

  ```



  Options:

   - path - url to scrape. Default is `"/metrics"`.

   - format - export format (`:prometheus_text_format` or `:prometheus_protobuf_format`). Default is `:prometheus_text_format`.

   - registry - prometheus registry to export. Default is `:default`.

  """



  import Plug.Conn

  @behaviour Plug



  def init(opts) do

    :prometheus.start

    path = Keyword.get(opts, :path, "/metrics")

    format = Keyword.get(opts, :format, :prometheus_text_format)

    registry = Keyword.get(opts, :registry, :default)

    {Plug.Router.Utils.split(path), format, registry}

  end



  def call(conn, {path, format, registry}) do



    case conn.path_info do

      ^path ->

        conn

        |> put_resp_content_type(format.content_type)

        |> send_resp(200, format.format(registry))

        |> halt

      _ ->

        conn

    end

  end

end