Module: Minion

Extended by:
Minion
Included in:
Minion
Defined in:
lib/minion.rb,
lib/minion/handler.rb

Defined Under Namespace

Classes: Handler

Instance Method Summary collapse

Instance Method Details

#amqp_url ⇒ Object 



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# File 'lib/minion.rb', line 102

def amqp_url
	@@amqp_url ||= ENV["AMQP_URL"] || "amqp://guest:guest@localhost/"
end

#amqp_url=(url) ⇒ Object 



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# File 'lib/minion.rb', line 106

def amqp_url=(url)
	@@amqp_url = url
end

#check_all ⇒ Object 



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# File 'lib/minion.rb', line 84

def check_all
	@@handlers.each { |h| h.check }
end

#decode_json(string) ⇒ Object 



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# File 'lib/minion.rb', line 76

def decode_json(string)
	if defined? ActiveSupport::JSON
		ActiveSupport::JSON.decode string
	else
		JSON.load string
	end
end

#enqueue(jobs, data = {}) ⇒ Object 



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# File 'lib/minion.rb', line 14

def enqueue(jobs, data = {})
	raise "cannot enqueue a nil job" if jobs.nil?
	raise "cannot enqueue an empty job" if jobs.empty?

	## jobs can be one or more jobs
	if jobs.respond_to? :shift
		queue = jobs.shift
		data["next_job"] = jobs unless jobs.empty?
	else
		queue = jobs
	end

	encoded = JSON.dump(data)
	log "send: #{queue}:#{encoded}"
	bunny.queue(queue, :durable => true, :auto_delete => false).publish(encoded)
end

#error(&blk) ⇒ Object 



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# File 'lib/minion.rb', line 36

def error(&blk)
	@@error_handler = blk
end

#job(queue, options = {}, &blk) ⇒ Object 



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# File 'lib/minion.rb', line 44

def job(queue, options = {}, &blk)
	handler = Minion::Handler.new queue
	handler.when = options[:when] if options[:when]
	handler.unsub = lambda do
		log "unsubscribing to #{queue}"
		MQ.queue(queue, :durable => true, :auto_delete => false).unsubscribe
	end
	handler.sub = lambda do
		log "subscribing to #{queue}"
		MQ.queue(queue, :durable => true, :auto_delete => false).subscribe(:ack => true) do |h,m|
			return if AMQP.closing?
			begin
				log "recv: #{queue}:#{m}"

				args = decode_json(m)

				result = yield(args)

				next_job(args, result)
			rescue Object => e
				raise unless error_handler
				error_handler.call(e,queue,m,h)
			end
			h.ack
			check_all
		end
	end
	@@handlers ||= []
	at_exit { Minion.run } if @@handlers.size == 0
	@@handlers << handler
end

#log(msg) ⇒ Object 



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# File 'lib/minion.rb', line 31

def log(msg)
	@@logger ||= proc { |m| puts "#{Time.now} :minion: #{m}" }
	@@logger.call(msg)
end

#logger(&blk) ⇒ Object 



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# File 'lib/minion.rb', line 40

def logger(&blk)
	@@logger = blk
end

#run ⇒ Object 



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# File 'lib/minion.rb', line 88

def run
	log "Starting minion"

	Signal.trap('INT') { AMQP.stop{ EM.stop } }
	Signal.trap('TERM'){ AMQP.stop{ EM.stop } }

	EM.run do
		AMQP.start(amqp_config) do
			MQ.prefetch(1)
			check_all
		end
	end
end

#url=(url) ⇒ Object 



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# File 'lib/minion.rb', line 10

def url=(url)
	@@config_url = url
end