/usr/lib/ruby/vendor_ruby/bunny/queue09.rb is in ruby-bunny 0.7.8-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Bunny
# Queues store and forward messages. Queues can be configured in the server or created at runtime.
# Queues must be attached to at least one exchange in order to receive messages from publishers.
class Queue09 < Qrack::Queue
def initialize(client, name, opts = {})
# check connection to server
raise Bunny::ConnectionError, 'Not connected to server' if client.status == :not_connected
@client = client
@opts = opts
@delivery_tag = nil
# Queues without a given name are named by the server and are generally
# bound to the process that created them.
if !name
opts = {
:passive => false,
:durable => false,
:exclusive => true,
:auto_delete => true,
:deprecated_ticket => 0
}.merge(opts)
end
# ignore the :nowait option if passed, otherwise program will hang waiting for a
# response that will not be sent by the server
opts.delete(:nowait)
opts = { :queue => name || '', :nowait => false, :deprecated_ticket => 0 }.merge(opts)
client.send_frame(Qrack::Protocol09::Queue::Declare.new(opts))
method = client.next_method
client.check_response(method, Qrack::Protocol09::Queue::DeclareOk, "Error declaring queue #{name}")
@name = method.queue
client.queues[@name] = self
end
# @return [Bunny::Consumer] Default consumer associated with this queue (if any), or nil
# @note Default consumer is the one registered with the convenience {Bunny::Queue#subscribe} method. It has no special properties of any kind.
# @see Queue#subscribe
# @see Bunny::Consumer
# @api public
def default_consumer
@default_consumer
end
# @return [Class]
# @private
def self.consumer_class
# Bunny::Consumer
Bunny::Subscription09
end # self.consumer_class
# Acknowledges one or more messages delivered via the _Deliver_ or _Get_-_Ok_ methods. The client can
# ask to confirm a single message or a set of messages up to and including a specific message.
#
# @option opts [String] :delivery_tag
#
# @option opts [Boolean] :multiple (false)
# If set to @true@, the delivery tag is treated as "up to and including",
# so that the client can acknowledge multiple messages with a single method.
# If set to @false@, the delivery tag refers to a single message.
# If the multiple field is @true@, and the delivery tag is zero,
# tells the server to acknowledge all outstanding messages.
def ack(opts = {})
# Set delivery tag
if delivery_tag.nil? and opts[:delivery_tag].nil?
raise Bunny::AcknowledgementError, "No delivery tag received"
else
self.delivery_tag = opts[:delivery_tag] if delivery_tag.nil?
end
opts = {:delivery_tag => delivery_tag, :multiple => false}.merge(opts)
client.send_frame(Qrack::Protocol09::Basic::Ack.new(opts))
# reset delivery tag
self.delivery_tag = nil
end
# Binds a queue to an exchange. Until a queue is bound it won't receive
# any messages. Queues are bound to the direct exchange '' by default.
# If error occurs, a {Bunny::ProtocolError} is raised.
#
# @option opts [String] :key
# Specifies the routing key for the binding. The routing key is used
# for routing messages depending on the exchange configuration.
#
# @option opts [Boolean] :nowait (false)
# Ignored by Bunny, always @false@.
#
# @return [Symbol] @:bind_ok@ if successful.
def bind(exchange, opts = {})
exchange = exchange.respond_to?(:name) ? exchange.name : exchange
# ignore the :nowait option if passed, otherwise program will hang waiting for a
# response that will not be sent by the server
opts.delete(:nowait)
opts = {
:queue => name,
:exchange => exchange,
:routing_key => opts.delete(:key),
:nowait => false,
:deprecated_ticket => 0
}.merge(opts)
client.send_frame(Qrack::Protocol09::Queue::Bind.new(opts))
method = client.next_method
client.check_response(method, Qrack::Protocol09::Queue::BindOk, "Error binding queue: #{name} to exchange: #{exchange}")
# return message
:bind_ok
end
# Requests that a queue is deleted from broker/server. When a queue is deleted any pending messages
# are sent to a dead-letter queue if this is defined in the server configuration. Removes reference
# from queues if successful. If an error occurs raises @Bunny::ProtocolError@.
#
# @option opts [Boolean] :if_unused (false)
# If set to @true@, the server will only delete the queue if it has no consumers.
# If the queue has consumers the server does not delete it but raises a channel exception instead.
#
# @option opts [Boolean] :if_empty (false)
# If set to @true@, the server will only delete the queue if it has no messages.
# If the queue is not empty the server raises a channel exception.
#
# @option opts [Boolean] :nowait (false)
# Ignored by Bunny, always @false@.
#
# @return [Symbol] @:delete_ok@ if successful
def delete(opts = {})
# ignore the :nowait option if passed, otherwise program will hang waiting for a
# response that will not be sent by the server
opts.delete(:nowait)
opts = { :queue => name, :nowait => false, :deprecated_ticket => 0 }.merge(opts)
client.send_frame(Qrack::Protocol09::Queue::Delete.new(opts))
method = client.next_method
client.check_response(method, Qrack::Protocol09::Queue::DeleteOk, "Error deleting queue #{name}")
client.queues.delete(name)
# return confirmation
:delete_ok
end
# Gets a message from a queue in a synchronous way. If error occurs, raises _Bunny_::_ProtocolError_.
#
# @option opts [Boolean] :ack (false)
# If set to @false@, the server does not expect an acknowledgement message
# from the client. If set to @true@, the server expects an acknowledgement
# message from the client and will re-queue the message if it does not receive
# one within a time specified by the server.
#
# @return [Hash] Hash with @:header@, @:payload@ and @:delivery_details@ keys. @:delivery_details@ is a hash @:consumer_tag@, @:delivery_tag@, @:redelivered@, @:exchange@ and @:routing_key@. If the queue is empty the returned hash will contain: @{:header => nil, :payload => :queue_empty, :delivery_details => nil}@. N.B. If a block is provided then the hash will be passed into the block and the return value will be nil.
def pop(opts = {}, &blk)
opts = {
:queue => name,
:consumer_tag => name,
:no_ack => !opts[:ack],
:nowait => true,
:deprecated_ticket => 0
}.merge(opts)
client.send_frame(Qrack::Protocol09::Basic::Get.new(opts))
method = client.next_method
if method.is_a?(Qrack::Protocol09::Basic::GetEmpty) then
queue_empty = true
elsif !method.is_a?(Qrack::Protocol09::Basic::GetOk)
raise Bunny::ProtocolError, "Error getting message from queue #{name}"
end
if !queue_empty
# get delivery tag to use for acknowledge
self.delivery_tag = method.delivery_tag if opts[:ack]
header = client.next_payload
# If maximum frame size is smaller than message payload body then message
# will have a message header and several message bodies
msg = ''
while msg.length < header.size
msg << client.next_payload
end
msg_hash = {:header => header, :payload => msg, :delivery_details => method.arguments}
else
msg_hash = {:header => nil, :payload => :queue_empty, :delivery_details => nil}
end
# Pass message hash to block or return message hash
blk ? blk.call(msg_hash) : msg_hash
end
# Removes all messages from a queue. It does not cancel consumers. Purged messages are deleted
# without any formal "undo" mechanism. If an error occurs raises {Bunny::ProtocolError}.
#
# @option opts [Boolean] :nowait (false)
# Ignored by Bunny, always @false@.
#
# @return [Symbol] @:purge_ok@ if successful
def purge(opts = {})
# ignore the :nowait option if passed, otherwise program will hang waiting for a
# response that will not be sent by the server
opts.delete(:nowait)
opts = { :queue => name, :nowait => false, :deprecated_ticket => 0 }.merge(opts)
client.send_frame(Qrack::Protocol09::Queue::Purge.new(opts))
method = client.next_method
client.check_response(method, Qrack::Protocol09::Queue::PurgeOk, "Error purging queue #{name}")
# return confirmation
:purge_ok
end
# @return [Hash] Hash with keys @:message_count@ and @consumer_count@.
def status
opts = { :queue => name, :passive => true, :deprecated_ticket => 0 }
client.send_frame(Qrack::Protocol09::Queue::Declare.new(opts))
method = client.next_method
{:message_count => method.message_count, :consumer_count => method.consumer_count}
end
def subscribe(opts = {}, &blk)
raise RuntimeError.new("This queue already has default consumer. Please instantiate Bunny::Consumer directly and call its #consume method to register additional consumers.") if @default_consumer && ! opts[:consumer_tag]
# Create a subscription.
@default_consumer = self.class.consumer_class.new(client, self, opts)
@default_consumer.consume(&blk)
end
# Removes a queue binding from an exchange. If error occurs, a _Bunny_::_ProtocolError_ is raised.
#
# @option opts [String] :key
# Specifies the routing key for the binding.
#
# @option opts [Boolean] :nowait (false)
# Ignored by Bunny, always @false@.
#
# @return [Symbol] @:unbind_ok@ if successful.
def unbind(exchange, opts = {})
exchange = exchange.respond_to?(:name) ? exchange.name : exchange
# ignore the :nowait option if passed, otherwise program will hang waiting for a
# response that will not be sent by the server
opts.delete(:nowait)
opts = {
:queue => name,
:exchange => exchange,
:routing_key => opts.delete(:key),
:nowait => false,
:deprecated_ticket => 0
}.merge(opts)
client.send_frame(Qrack::Protocol09::Queue::Unbind.new(opts))
method = client.next_method
client.check_response(method, Qrack::Protocol09::Queue::UnbindOk, "Error unbinding queue #{name}")
# return message
:unbind_ok
end
# Cancels a consumer. This does not affect already delivered messages, but it does mean
# the server will not send any more messages for that consumer.
#
# @option opts [String] :consumer_tag
# Specifies the identifier for the consumer.
#
# @option opts [Boolean] :nowait (false)
# Ignored by Bunny, always @false@.
#
# @return [Symbol] @:unsubscribe_ok@ if successful
def unsubscribe(opts = {})
# Default consumer_tag from subscription if not passed in
consumer_tag = @default_consumer ? @default_consumer.consumer_tag : opts[:consumer_tag]
# Must have consumer tag to tell server what to unsubscribe
raise Bunny::UnsubscribeError,
"No consumer tag received" if !consumer_tag
# Cancel consumer
client.send_frame(Qrack::Protocol09::Basic::Cancel.new(:consumer_tag => consumer_tag, :nowait => false))
method = client.next_method
client.check_response(method, Qrack::Protocol09::Basic::CancelOk, "Error unsubscribing from queue #{name}")
# Reset subscription
@default_consumer = nil
# Return confirmation
:unsubscribe_ok
end
private
def exchange
@exchange ||= Bunny::Exchange09.new(client, '', :type => :direct, :key => name, :reserved_1 => 0, :reserved_2 => false, :reserved_3 => false)
end
end
end
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