laut.fm Data Collector

# @name LautFM Data
# @desc Zentrale laut.fm-Abfrage für Song und Hörerzahl
# @headless true

# @config station text "laut.fm Sender" default="HIER_DEINEN_SENDER_EINTRAGEN" maxlen=64
# @config every number "Aktualisierung" default=60 min=30 max=3600 unit=s

import json

class LautFmData
  var station
  var url_song
  var url_listeners
  var period
  var ticks
  var in_flight

  var song
  var listeners

  def init()
    self.station = store.get("station")
    self.period = store.get("every")

    self.url_song = "https://api.laut.fm/station/" + self.station + "/current_song"
    self.url_listeners = "https://api.laut.fm/station/" + self.station + "/listeners"

    self.ticks = 10
    self.in_flight = false

    self.song = ""
    self.listeners = nil
  end


  def setup()
    self.fetch_song()
  end


  # ================================================
  # Aktuellen Song holen
  # ================================================

  def fetch_song()
    if self.in_flight
      return
    end

    self.in_flight = true

    http.get(
      self.url_song,
      /body, status -> self.on_song(body, status)
    )
  end


  def on_song(body, status)
    if body == nil || status < 200 || status >= 300
      self.in_flight = false
      self.ticks = 10
      return
    end

    var data = json.load(body)

    if data == nil
      self.in_flight = false
      self.ticks = 10
      return
    end

    var title = data.find("title", "")
    var artist = ""

    var artist_data = data.find("artist", nil)

    if artist_data != nil
      artist = artist_data.find("name", "")
    end

    if artist != "" && title != ""
      self.song = str(artist) + " - " + str(title)
    elif title != ""
      self.song = str(title)
    elif artist != ""
      self.song = str(artist)
    else
      self.song = "Kein Titel"
    end


    # Danach Hörerzahl abfragen
    http.get(
      self.url_listeners,
      /listener_body, listener_status -> self.on_listeners(listener_body, listener_status)
    )
  end


  # ================================================
  # Hörerzahl holen
  # ================================================

  def on_listeners(body, status)
    self.in_flight = false

    if body != nil && status >= 200 && status < 300

      # Die listeners-Antwort ist eine Zahl/Text,
      # kein JSON-Objekt.
      var value = num(body)

      if value != nil
        self.listeners = value
      end
    end


    # ============================================
    # Ergebnisse veröffentlichen
    # ============================================

    shared.set("song", self.song)

    if self.listeners != nil
      shared.set("listeners", self.listeners)
    end

    shared.set("ok", true)

    # Nächste Aktualisierung
    self.ticks = self.period
  end


  # ================================================
  # Polling
  # ================================================

  def loop()
    if self.ticks <= 0

      if !self.in_flight
        self.fetch_song()
      end

    else
      self.ticks -= 1
    end
  end

end

return LautFmData()