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messenger_bot

1.0.0-beta5
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Unofficial Facebook Messenger Platform chatbot client and webhook handler

Retired package: Deprecated
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messenger_bot lib messenger_bot services message.ex
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lib/messenger_bot/services/message.ex 

defmodule MessengerBot.Service.Message do

  @moduledoc """

  Facebook Messenger 'Message' API

  """



  use EventBus.EventSource

  alias MessengerBot.Client

  alias MessengerBot.Config

  alias MessengerBot.Payload.MessageRequest



  @path "/messages"



  @doc """

  Deliver request to facebook api

  """

  @spec deliver(String.t(), MessageRequest.t()) ::

          {:ok, Map.t()} | {:error, Map.t()}

  def deliver(page_id, %MessageRequest{} = request, transaction_id \\ nil) do

    transaction_id = if transaction_id, do: transaction_id, else: UUID.uuid4()

    app_id = Config.app_id()

    page_token = Config.page_token(page_id)

    url = Client.url(@path, page_token)



    case Client.post(url, request) do

      %HTTPoison.Response{} = response ->

        body = :jiffy.decode(response.body, [:return_maps])

        report(:succeeded, {app_id, page_id, request, body}, transaction_id)

        body



      {:error, %HTTPoison.Response{} = response} ->

        body = :jiffy.decode(response.body, [:return_maps])

        report(:failed, {app_id, page_id, request, body}, transaction_id)

        {:error, body}



      {:error, error} ->

        report(

          :request_failed,

          {app_id, page_id, request, error},

          transaction_id

        )



        {:error, %{"request_error" => error}}

    end

  end



  defp report(status, {app_id, page_id, request, response_body}, transaction_id) do

    EventSource.notify %{

      id: UUID.uuid4(),

      topic: :"mb_message_sent_#{status}",

      transaction_id: transaction_id

    } do

      {app_id, page_id, request, response_body}

    end

  end

end