Class: Carrot::AMQP::Queue

Inherits:
Object
  • Object
show all
Defined in:
lib/amqp/queue.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(carrot, name, opts = {}) ⇒ Queue

Returns a new instance of Queue.



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# File 'lib/amqp/queue.rb', line 6

def initialize(carrot, name, opts = {})
  @opts   = opts
  @name   = name
  @carrot = carrot
  server.send_frame(
          Protocol::Queue::Declare.new({ :queue => name, :nowait => true }.merge(opts))
  )
end

Instance Attribute Details

#carrot ⇒ Object (readonly)

Returns the value of attribute carrot.



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# File 'lib/amqp/queue.rb', line 3

def carrot
  @carrot
end

#delivery_tag ⇒ Object

Returns the value of attribute delivery_tag.



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# File 'lib/amqp/queue.rb', line 4

def delivery_tag
  @delivery_tag
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/amqp/queue.rb', line 3

def name
  @name
end

Instance Method Details

#ack ⇒ Object 



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# File 'lib/amqp/queue.rb', line 35

def ack
  server.send_frame(
          Protocol::Basic::Ack.new(:delivery_tag => delivery_tag)
  )
end

#bind(exchange, opts = {}) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 63

def bind(exchange, opts = {})
  exchange           = exchange.respond_to?(:name) ? exchange.name : exchange
  bindings[exchange] = opts
  server.send_frame(
          Protocol::Queue::Bind.new({ :queue => name, :exchange => exchange, :routing_key => opts.delete(:key), :nowait => true }.merge(opts))
  )
end

#consumer_count ⇒ Object 



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# File 'lib/amqp/queue.rb', line 49

def consumer_count
  status.last
end

#decrypt_message(message, password) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 129

def decrypt_message(message, password)
  decrypted_message = message.decrypt(:symmetric, :password => password)
  decrypted_message
end

#delete(opts = {}) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 82

def delete(opts = {})
  server.send_frame(
          Protocol::Queue::Delete.new({ :queue => name, :nowait => true }.merge(opts))
  )
  carrot.queues.delete(name)
end

#encrypt_and_send_message(opts = {}) ⇒ Object

Is a wrapper around publish to send persistent and encrypted messages using symmetric key.



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# File 'lib/amqp/queue.rb', line 137

def encrypt_and_send_message(opts={})
  opts.merge!(:persistent => true)
  encrypted_message = encrypt_message(opts[:message], opts[:password])
  exchange.publish(encrypted_message,opts)
end

#encrypt_message(message, password) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 124

def encrypt_message(message, password)
  encrypted_message = message.encrypt(:symmetric, :password => password)
  encrypted_message
end

#message_count ⇒ Object 



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# File 'lib/amqp/queue.rb', line 45

def message_count
  status.first
end

#pop(opts = {}) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 15

def pop(opts = {})
  self.delivery_tag = nil
  server.send_frame(
          Protocol::Basic::Get.new({ :queue => name, :consumer_tag => name, :no_ack => !opts.delete(:ack), :nowait => true }.merge(opts))
  )
  method = server.next_method
  return unless method.kind_of?(Protocol::Basic::GetOk)

  self.delivery_tag = method.delivery_tag

  header = server.next_payload

  msg = ''
  while msg.length < header.size
    msg << server.next_payload
  end

  msg
end

#publish(data, opts = {}) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 41

def publish(data, opts = {})
  exchange.publish(data, opts)
end

#purge(opts = {}) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 89

def purge(opts = {})
  server.send_frame(
          Protocol::Queue::Purge.new({ :queue => name, :nowait => true }.merge(opts))
  )
end

#receive_and_decrypt_message(opts = {}) ⇒ Object

This method will receive and decrypt messages using symmetric key.



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# File 'lib/amqp/queue.rb', line 146

def receive_and_decrypt_message(opts={})
  msg  = pop(opts)
  unless msg.nil?
    decrypted_message = decrypt_message(msg, opts[:password])
    decrypted_message
  end
  decrypted_message || msg
end

#receive_message(opts = {}) ⇒ Object

This message will decrypt the message if a password is passed. Else it will pop the message as it is.



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# File 'lib/amqp/queue.rb', line 114

def receive_message(opts={})
  msg      = pop(opts)
  password = opts[:password]
  if msg && password
    decrypted_message = decrypt_message(msg, password)
    decrypted_message
  end
  decrypted_message || msg
end

#send_message(data, opts = {}) ⇒ Object

Is a wrapper around publish to send persistent messages.



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# File 'lib/amqp/queue.rb', line 102

def send_message(data,opts={})
  opts.merge!(:persistent => true)
  # Encrypt the message using the password supplied
  data = encrypt_message(data, opts[:password]) if opts[:password]
  exchange.publish(data,opts)
end

#server ⇒ Object 



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# File 'lib/amqp/queue.rb', line 95

def server
  carrot.server
end

#status(opts = {}, &blk) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 53

def status(opts = {}, &blk)
  server.send_frame(
          Protocol::Queue::Declare.new({ :queue => name, :passive => true }.merge(opts))
  )
  method = server.next_method
  return [nil, nil] if method.kind_of?(Protocol::Connection::Close)

  [method.message_count, method.consumer_count]
end

#unbind(exchange, opts = {}) ⇒ Object 



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# File 'lib/amqp/queue.rb', line 71

def unbind(exchange, opts = {})
  exchange = exchange.respond_to?(:name) ? exchange.name : exchange
  bindings.delete(exchange)

  server.send_frame(
          Protocol::Queue::Unbind.new({
                  :queue => name, :exchange => exchange, :routing_key => opts.delete(:key), :nowait => true }.merge(opts)
          )
  )
end