Push Module

pusher.rb

require 'houston'
require 'gcm'

module Pusher
  APN = Houston::Client.production
  APN.certificate = File.read(File.expand_path('path/to/push_cert.pem', __FILE__))

  # Apple has hard limit on the payload of push notification. The maximum size allowed for a notification payload is 256 bytes; 
  # If you have other fields in the notification, you need to tweak this value to fit your needs. Be careful about this. 
  MAX_ALERT_LENGTH = 140 

  def push_to_ios(ios_tokens, alert, custom_data)
    # create all notifications
    notifications = ios_tokens.compact.uniq.map do |token|
      notification = Houston::Notification.new(
        device: token,
        alert: (alert || 'No Title').truncate(MAX_ALERT_LENGTH),
        sound: custom_data['sound'] || 'default.aif',
        badge: 1 # set app badge to the number of unread alerts
      )
      notification.custom_data = custom_data

      notification
    end

    APN.push notifications
  end

  # GCM can only push 1k tokens at a time
  GCM_BATCH_LIMIT = 1000
  GCM_API_KEY = '...'

  def push_to_android(android_tokens, data)
    clean_tokens = android_tokens.compact.uniq
    gcm = GCM.new(GCM_API_KEY)
    clean_tokens.each_slice(GCM_BATCH_LIMIT) {|batch| gcm.send_notification(batch, data: data)}
  end
end