Module: Maestro::MQHelper

Defined in:
lib/maestro_common/helpers/mq_helper.rb

Defined Under Namespace

Classes: MQError

Constant Summary collapse

@@INFINITE_RETRIES = 
2**32-1
@@stomp = 
nil
@@subs = 
{}
@@tries = 
0
@@sleep = 
20
@@uri = 
nil

Class Method Summary collapse

Class Method Details

.connect ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 38

def MQHelper.connect
  if @@stomp.nil?
    Maestro.log.info "Request for stomp connection - creating"

    # retry info - the retryable below doesn't support 'unlimited' but if we give it a really big number...
    if @@tries == 0
      @@tries = Maestro.stomp_config['max_retries']

      if @@tries.nil?
        @@tries = @@INFINITE_RETRIES
        Maestro.log.info "Connect retry attempt count not specified, using ~INFINITE (really big number)"
      else
        Maestro.log.info "Connect retry attempt count not specified, using config file setting #{@@tries}"
      end
    end

    @@sleep = Maestro.stomp_config['retry_seconds'] || 20

    # New form is config.url = some_url
    # Old form is config.user, config.passcode, config.host, config.port,
    # config.ssl
    # Check for new config first, it overrides
    url = Maestro.stomp_config['url']

    if url && !url.empty?
      # New form
      is_failover = url.start_with?('failover:')
      options = {}

      if url.include?('+ssl')
        options[:ssl] = { :ca_file => Maestro.stomp_config['cert'] || nil, :verify_mode => OpenSSL::SSL::VERIFY_NONE }
      end

      @@uri = url

      if is_failover
        Maestro.log.info "Using OnStomp Failover Client"
        client = OnStomp::Failover::Client.new(url, options)
      else
        client = OnStomp::Client.new(url, options)
      end
    else
      # Old form
      Maestro.log.debug "Old-form stomp config being used"
      user = Maestro.stomp_config['user']
      passcode = Maestro.stomp_config['passcode']
      host = Maestro.stomp_config['host']
      port = Maestro.stomp_config['port'].to_s
      ssl = Maestro.stomp_config['ssl'] ? "+ssl" : ""
      cert = Maestro.stomp_config['cert'] || nil
  
      # construct the connection URI
      user_and_password = [user,passcode].reject{ |e| e.nil? || e.empty? }.join(":")
      host_and_port     = [host,port].reject{|e| e.nil? || e.empty?}.join(":")
      protocol          = ['stomp', ssl, '://'].reject{|e| e.nil? || e.empty?}.join
      @@uri             = protocol + [host_and_port, user_and_password].reject{|e| e.nil? || e.empty?}.reverse.join("@")
  
      if (!ssl.nil? && ssl == "+ssl")
        client = OnStomp::Client.new(@@uri, :ssl => {:ca_file => cert, :verify_mode => OpenSSL::SSL::VERIFY_NONE})
      else
        client = OnStomp::Client.new(@@uri)
      end
    end

    @@stomp = client
    reconnect
    raise "Failed To Connect To Maestro" unless client.connected?
  end
  
  @@stomp
end

.connection ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 26

def MQHelper.connection
  if @@stomp.nil?
    Maestro.log.warn "Request for stomp connection, but not set up yet!"
  end
  @@stomp
end

.connection=(stomp) ⇒ Object

only for testing



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 34

def MQHelper.connection=(stomp)
  @@stomp = stomp
end

.disconnect ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 136

def MQHelper.disconnect
  if !@@stomp.nil?
    @@stomp.disconnect
  end
end

.reconnect ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 110

def MQHelper.reconnect
  if !@@stomp
    raise Maestro::MQHelper::MQError, "Cannot reconnect, no existing MQ instance.  Call 'connect' to create initial connection, then use 'reconnect' if connection fails"
  end

  if !@@stomp.connected?
    Maestro::Utils.retryable(:tries => @@tries, :sleep => @@sleep) do
      Maestro.log.info "Connecting To stomp At #{@@uri}"
      @@stomp.connect
    end

    if @@stomp.connected?
      oldsubs = @@subs.dup
      @@subs.clear
      oldsubs.each do |dest, info|
        Maestro.log.info "Resubscribing to #{dest}"
        do_subscribe(dest, info['headers'], &info['callback'])
      end
    else
      Maestro.log.warn "Unable to reconnect to subscriptions because no MQ Connection"
    end
  end

  @@stomp.connected?
end

.reset ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 17

def MQHelper.reset
  Maestro.log.info "Resetting MQHelper"
  @@stomp = nil
  @@subs = {}
  @@tries = 0
  @@sleep = 20
  @@uri = nil
end

.subscribe(dest, headers = {}, &cb) ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 142

def MQHelper.subscribe(dest, headers={}, &cb)
  Maestro.log.info "MQHelper: Subscribing to #{dest}"
  do_subscribe(dest, headers, &cb)
end

.unsubscribe(dest, &cb) ⇒ Object 



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# File 'lib/maestro_common/helpers/mq_helper.rb', line 147

def MQHelper.unsubscribe(dest, &cb)
  if @@subs.has_key?(dest)
    Maestro.log.info "MQHelper: Unsubscribing from #{dest}"
    @@stomp.unsubscribe(@@subs[dest]['frame'])
    @@subs.delete(dest)
  end
end