Class: RocketSMS::Scheduler

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/rocket_sms/scheduler.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Scheduler

Returns a new instance of Scheduler.



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# File 'lib/rocket_sms/scheduler.rb', line 8

def initialize
  @redis_url, @log_location = nil, nil
  @active = true
  @fast = false
  @dids = {}
  @transceivers = {}
  @throughput = 0
end

Instance Attribute Details

#log_location ⇒ Object

Returns the value of attribute log_location.



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# File 'lib/rocket_sms/scheduler.rb', line 6

def log_location
  @log_location
end

#redis_url ⇒ Object

Returns the value of attribute redis_url.



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# File 'lib/rocket_sms/scheduler.rb', line 6

def redis_url
  @redis_url
end

Instance Method Details

#configure ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 67

def configure
  return unless @active
  @configurator = EM::Timer.new(1){ configure }
  redis.keys("gateway:transceivers:*") do |keys|
    if keys
      tids = keys.map{ |key| key.split(':')[2] }.uniq
      @transceivers.keys.each{ |k| @transceivers.delete(k) unless tids.include?(k) }
      tids.each do |tid|
        redis.hget("gateway:transceivers:#{tid}","status") do |resp|
          if resp == 'online'
            redis.hget("gateway:transceivers:#{tid}", "throughput") do |payload|
              if payload
                throughput = payload.to_f
                log "Adding Transceiver #{tid}" if !@transceivers[tid]
                @transceivers[tid] = throughput
                set_throughput
              elsif @transceivers[tid]
                log "Removing Transceiver #{tid}" 
                @transceivers.delete(tid)
                set_throughput
              end
            end
          else
            if @transceivers[tid]
              log "Removing Transceiver #{tid}"
              @transceivers.delete(tid)
              set_throughput
            end
          end
        end
      end
    else
      @transceivers = {}
      @throughput = 0
    end
  end
end

#detect ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 109

def detect
  return unless @active
  interval = @fast ? 0.001 : 1
  @detector = EM::Timer.new(interval){ detect }
  redis.multi
  redis.zrange(queues[:mt][:pending], 0, 0, "WITHSCORES")
  redis.zremrangebyrank(queues[:mt][:pending], 0, 0)
  redis.exec do |response|
    if response
      (payload, score) = response[0]
      if payload and score
        @fast = true
        now = Time.now.to_i
        if score.to_i <= now
          process_payload(payload)
        else
          redis.zadd(queues[:mt][:pending], score, payload)
          @fast = false
        end
      else
        @fast = false
      end
    end
  end
end

#log(msg, level = 'info') ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 25

def log(msg, level = 'info')
  if EM.reactor_running?
    EM.defer{ logger.send(level, msg) }
  else
    logger.send(level, msg)
  end
end

#logger ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 21

def logger
  @logger ||= Logger.new(@log_location)
end

#pick_transceiver ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 189

def pick_transceiver
  tids = []
  @transceivers.each do |k,v|
    weight = (v.to_f/@throughput*100).to_i
    weight.times{ tids << k }
  end
  tids.flatten!
  tids.sample
end

#process_payload(msg_payload) ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 135

def process_payload(msg_payload)
  begin
    message = Message.from_json(msg_payload)
    if message.pass > 5
      log "Message #{message.id} has exceeded maximum retries. Send it to Failed queue."
      redis.lpush(queues[:mt][:failure], message.to_json)
    else
      did_number = message.sender
      redis.get("gateway:dids:#{did_number}") do |payload|
        if payload
          log "Scheduling Message #{message.id} to be sent through DID #{did_number}"
          schedule(message, payload)
        else
          log "The DID #{did_number} for message #{message.id} is not configured. Retrying."
          retry_message(message)
        end
      end
    end
  rescue
    log 'Invalid Message.'
    redis.lpush(queues[:mt][:failure])
  end
end

#queues ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 33

def queues
  RocketSMS.queues
end

#redis ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 17

def redis
  @redis ||= EM::Hiredis.connect(@redis_url)
end

#retry_message(message) ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 199

def retry_message(message)
  if message.pass > 5
    log "Message #{message.id} has exceeded maximum retries. Send it to Failed queue."
    redis.lpush(queues[:mt][:failure], message.to_json)
  else
    message.add_pass
    score = Time.now.to_i + 15
    redis.zadd(queues[:mt][:pending], score, message.to_json)
  end
end

#schedule(message, did_payload) ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 159

def schedule(message, did_payload)
  if @active
    if @transceivers.keys.empty? or @throughput == 0
      retry_message(message)
    else
      did = Did.from_json(did_payload)
      if !@dids[did.number]
        @dids[did.number] = {}
        @dids[did.number][:last_send] = Time.now.to_f + 1
      end
      interval = ((did.throughput.to_f)**-1)*1.1
      last_send = @dids[did.number][:last_send]
      if Time.now.to_f - last_send > interval
        base_time = Time.now.to_f + 1
      else
        base_time = last_send
      end
      message.send_at = base_time + interval
      message.expires_at = message.send_at + 50*interval
      @dids[did.number][:last_send] = message.send_at
      score = (message.send_at * 1000).to_i
      transceiver_id = pick_transceiver
      redis.zadd("gateway:transceivers:#{transceiver_id}:dispatch", score, message.to_json)
    end
  else
    score = message.send_at.to_i + 15
    redis.zadd(queues[:mt][:pending], score, message.to_json)
  end
end

#set_throughput ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 105

def set_throughput
  @throughput = @transceivers.keys.map{ |tid| @transceivers[tid] }.reduce(&:+).to_f
end

#shutdown ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 62

def shutdown
  log "Scheduler DOWN."
  EM.stop
end

#start ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 37

def start
  EM.threadpool_size = 128
  EM.set_max_timers(100_000)
  EM.run do
    log "Starting Scheduler"
    configure
    detect
    # Trap exit-related signals
    Signal.trap("INT") { |signal| stop(signal) }
    Signal.trap("TERM") { |signal| stop(signal) }
  end
end

#stop(signal = nil) ⇒ Object 



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# File 'lib/rocket_sms/scheduler.rb', line 50

def stop(signal = nil)
  if @kill
    log "Forcing Exit. Check your data for losses."
    shutdown
  else
    log "Stopping. Waiting 5 seconds for pending operations to finish."
    @kill = true
    @active = false
    EM::Timer.new(5){ shutdown }
  end
end