§ what

balalaika_bear is a fork of deprecated VK API library for Elixir.

§ why and how it started

Most of the modern programming languages ain't rich of decent VK API libraries. And only some exceptions that proves the rule has Longpoll functionality amongst API method functions and macros.

It's the main problem I am trying to solve by rewriting an existing library for my most familiar programming language.

§ milestones

The new perfect library will be fully independent of balalaika_bear.

§ usage example

defmodule TestBot do
  alias BalalaikaBear.Longpoll.GroupLongpoll, as: Longpoll

  @token "your token"
  @group_id "your group id"

  @spec main(any) :: any
  def main(_args) do
    # Start longpoll
    parent = self()

    pid =
      spawn(
        Longpoll,
        :init,
        [parent, %{access_token: @token, group_id: @group_id, v: 5.131}]
      )

    loop()
  end

  # Main longpoll loop
  defp loop() do
    receive do
      {:ok, response} ->
        updates = response["updates"]

        unless updates == nil do
          [update | _] = response["updates"]

          # Processing events in separate tasks
          Task.start(fn ->
            process_event(update["type"], update["object"])
          end)
        end
    end

    loop()
  end

  # Works with incoming events depending on event type.
  # Works with incoming messages.
  defp process_event("message_new", event) do
    message = event["message"]
    from_id = message["from_id"]
    peer_id = message["peer_id"]

    process_message(from_id, peer_id, message)
  end

  # Works with other events
  defp process_event(_, _) do
  end

  # Works with message events.
  # If message from chat
  defp process_message(from_id, peer_id, message) when from_id != peer_id do
    text = message["text"]
    
    # ...
    # do something with message
    # ...
  end

  # If message from messenger
  defp process_message(_from_id, peer_id, message) do
    text = message["text"]
    
    # ...
    # do something with message
    # ...
  end
end