lib/gorgon_bunny/lib/gorgon_bunny/session.rb
require "socket"
require "thread"
require "monitor"
require "gorgon_bunny/transport"
require "gorgon_bunny/channel_id_allocator"
require "gorgon_bunny/heartbeat_sender"
require "gorgon_bunny/reader_loop"
require "gorgon_bunny/authentication/credentials_encoder"
require "gorgon_bunny/authentication/plain_mechanism_encoder"
require "gorgon_bunny/authentication/external_mechanism_encoder"
if defined?(JRUBY_VERSION)
require "gorgon_bunny/concurrent/linked_continuation_queue"
else
require "gorgon_bunny/concurrent/continuation_queue"
end
require "gorgon_amq/protocol/client"
require "gorgon_amq/settings"
module GorgonBunny
# Represents AMQP 0.9.1 connection (to a RabbitMQ node).
# @see http://rubybunny.info/articles/connecting.html Connecting to RabbitMQ guide
class Session
# Default host used for connection
DEFAULT_HOST = "127.0.0.1"
# Default virtual host used for connection
DEFAULT_VHOST = "/"
# Default username used for connection
DEFAULT_USER = "guest"
# Default password used for connection
DEFAULT_PASSWORD = "guest"
# Default heartbeat interval, the same value as RabbitMQ 3.0 uses.
DEFAULT_HEARTBEAT = :server
# @private
DEFAULT_FRAME_MAX = 131072
# backwards compatibility
# @private
CONNECT_TIMEOUT = Transport::DEFAULT_CONNECTION_TIMEOUT
# @private
DEFAULT_CONTINUATION_TIMEOUT = if RUBY_VERSION.to_f < 1.9
8000
else
15000
end
# RabbitMQ client metadata
DEFAULT_CLIENT_PROPERTIES = {
:capabilities => {
:publisher_confirms => true,
:consumer_cancel_notify => true,
:exchange_exchange_bindings => true,
:"basic.nack" => true,
:"connection.blocked" => true,
# See http://www.rabbitmq.com/auth-notification.html
:authentication_failure_close => true
},
:product => "GorgonBunny",
:platform => ::RUBY_DESCRIPTION,
:version => GorgonBunny::VERSION,
:information => "http://rubybunny.info",
}
# @private
DEFAULT_LOCALE = "en_GB"
# Default reconnection interval for TCP connection failures
DEFAULT_NETWORK_RECOVERY_INTERVAL = 5.0
#
# API
#
# @return [GorgonBunny::Transport]
attr_reader :transport
attr_reader :status, :host, :port, :heartbeat, :user, :pass, :vhost, :frame_max, :threaded
attr_reader :server_capabilities, :server_properties, :server_authentication_mechanisms, :server_locales
attr_reader :default_channel
attr_reader :channel_id_allocator
# Authentication mechanism, e.g. "PLAIN" or "EXTERNAL"
# @return [String]
attr_reader :mechanism
# @return [Logger]
attr_reader :logger
# @return [Integer] Timeout for blocking protocol operations (queue.declare, queue.bind, etc), in milliseconds. Default is 15000.
attr_reader :continuation_timeout
# @param [String, Hash] connection_string_or_opts Connection string or a hash of connection options
# @param [Hash] optz Extra options not related to connection
#
# @option connection_string_or_opts [String] :host ("127.0.0.1") Hostname or IP address to connect to
# @option connection_string_or_opts [Integer] :port (5672) Port RabbitMQ listens on
# @option connection_string_or_opts [String] :username ("guest") Username
# @option connection_string_or_opts [String] :password ("guest") Password
# @option connection_string_or_opts [String] :vhost ("/") Virtual host to use
# @option connection_string_or_opts [Integer] :heartbeat (600) Heartbeat interval. 0 means no heartbeat.
# @option connection_string_or_opts [Integer] :network_recovery_interval (4) Recovery interval periodic network recovery will use. This includes initial pause after network failure.
# @option connection_string_or_opts [Boolean] :tls (false) Should TLS/SSL be used?
# @option connection_string_or_opts [String] :tls_cert (nil) Path to client TLS/SSL certificate file (.pem)
# @option connection_string_or_opts [String] :tls_key (nil) Path to client TLS/SSL private key file (.pem)
# @option connection_string_or_opts [Array<String>] :tls_ca_certificates Array of paths to TLS/SSL CA files (.pem), by default detected from OpenSSL configuration
# @option connection_string_or_opts [Integer] :continuation_timeout (15000) Timeout for client operations that expect a response (e.g. {GorgonBunny::Queue#get}), in milliseconds.
#
# @option optz [String] :auth_mechanism ("PLAIN") Authentication mechanism, PLAIN or EXTERNAL
# @option optz [String] :locale ("PLAIN") Locale RabbitMQ should use
#
# @see http://rubybunny.info/articles/connecting.html Connecting to RabbitMQ guide
# @see http://rubybunny.info/articles/tls.html TLS/SSL guide
# @api public
def initialize(connection_string_or_opts = Hash.new, optz = Hash.new)
opts = case (ENV["RABBITMQ_URL"] || connection_string_or_opts)
when nil then
Hash.new
when String then
self.class.parse_uri(ENV["RABBITMQ_URL"] || connection_string_or_opts)
when Hash then
connection_string_or_opts
end.merge(optz)
@opts = opts
@host = self.hostname_from(opts)
@port = self.port_from(opts)
@user = self.username_from(opts)
@pass = self.password_from(opts)
@vhost = self.vhost_from(opts)
@logfile = opts[:log_file] || opts[:logfile] || STDOUT
@threaded = opts.fetch(:threaded, true)
self.init_logger(opts[:log_level] || ENV["BUNNY_LOG_LEVEL"] || Logger::WARN)
# should automatic recovery from network failures be used?
@automatically_recover = if opts[:automatically_recover].nil? && opts[:automatic_recovery].nil?
true
else
opts[:automatically_recover] || opts[:automatic_recovery]
end
@network_recovery_interval = opts.fetch(:network_recovery_interval, DEFAULT_NETWORK_RECOVERY_INTERVAL)
# in ms
@continuation_timeout = opts.fetch(:continuation_timeout, DEFAULT_CONTINUATION_TIMEOUT)
@status = :not_connected
@blocked = false
# these are negotiated with the broker during the connection tuning phase
@client_frame_max = opts.fetch(:frame_max, DEFAULT_FRAME_MAX)
@client_channel_max = opts.fetch(:channel_max, 65536)
@client_heartbeat = self.heartbeat_from(opts)
@client_properties = opts[:properties] || DEFAULT_CLIENT_PROPERTIES
@mechanism = opts.fetch(:auth_mechanism, "PLAIN")
@credentials_encoder = credentials_encoder_for(@mechanism)
@locale = @opts.fetch(:locale, DEFAULT_LOCALE)
@mutex_impl = @opts.fetch(:mutex_impl, Monitor)
# mutex for the channel id => channel hash
@channel_mutex = @mutex_impl.new
# transport operations/continuations mutex. A workaround for
# the non-reentrant Ruby mutexes. MK.
@transport_mutex = @mutex_impl.new
@channels = Hash.new
@origin_thread = Thread.current
self.reset_continuations
self.initialize_transport
end
# @return [String] RabbitMQ hostname (or IP address) used
def hostname; self.host; end
# @return [String] Username used
def username; self.user; end
# @return [String] Password used
def password; self.pass; end
# @return [String] Virtual host used
def virtual_host; self.vhost; end
# @return [Integer] Heartbeat interval used
def heartbeat_interval; self.heartbeat; end
# @return [Boolean] true if this connection uses TLS (SSL)
def uses_tls?
@transport.uses_tls?
end
alias tls? uses_tls?
# @return [Boolean] true if this connection uses TLS (SSL)
def uses_ssl?
@transport.uses_ssl?
end
alias ssl? uses_ssl?
# @return [Boolean] true if this connection uses a separate thread for I/O activity
def threaded?
@threaded
end
# @private
attr_reader :mutex_impl
# Provides a way to fine tune the socket used by connection.
# Accepts a block that the socket will be yielded to.
def configure_socket(&block)
raise ArgumentError, "No block provided!" if block.nil?
@transport.configure_socket(&block)
end
# Starts the connection process.
#
# @see http://rubybunny.info/articles/getting_started.html
# @see http://rubybunny.info/articles/connecting.html
# @api public
def start
return self if connected?
@status = :connecting
# reset here for cases when automatic network recovery kicks in
# when we were blocked. MK.
@blocked = false
self.reset_continuations
begin
# close existing transport if we have one,
# to not leak sockets
@transport.maybe_initialize_socket
@transport.post_initialize_socket
@transport.connect
if @socket_configurator
@transport.configure_socket(&@socket_configurator)
end
self.init_connection
self.open_connection
@reader_loop = nil
self.start_reader_loop if threaded?
@default_channel = self.create_channel
rescue Exception => e
@status = :not_connected
raise e
end
self
end
# Socket operation timeout used by this connection
# @return [Integer]
# @private
def read_write_timeout
@transport.read_write_timeout
end
# Opens a new channel and returns it. This method will block the calling
# thread until the response is received and the channel is guaranteed to be
# opened (this operation is very fast and inexpensive).
#
# @return [GorgonBunny::Channel] Newly opened channel
def create_channel(n = nil, consumer_pool_size = 1)
if n && (ch = @channels[n])
ch
else
ch = GorgonBunny::Channel.new(self, n, ConsumerWorkPool.new(consumer_pool_size || 1))
ch.open
ch
end
end
alias channel create_channel
# Closes the connection. This involves closing all of its channels.
def close
if @transport.open?
close_all_channels
GorgonBunny::Timeout.timeout(@transport.disconnect_timeout, ClientTimeout) do
self.close_connection(true)
end
maybe_shutdown_reader_loop
close_transport
@status = :closed
end
end
alias stop close
# Creates a temporary channel, yields it to the block given to this
# method and closes it.
#
# @return [GorgonBunny::Session] self
def with_channel(n = nil)
ch = create_channel(n)
yield ch
ch.close if ch.open?
self
end
# @return [Boolean] true if this connection is still not fully open
def connecting?
status == :connecting
end
# @return [Boolean] true if this AMQP 0.9.1 connection is closed
def closed?
status == :closed
end
# @return [Boolean] true if this AMQP 0.9.1 connection is open
def open?
(status == :open || status == :connected || status == :connecting) && @transport.open?
end
alias connected? open?
# @return [Boolean] true if this connection has automatic recovery from network failure enabled
def automatically_recover?
@automatically_recover
end
#
# Backwards compatibility
#
# @private
def queue(*args)
@default_channel.queue(*args)
end
# @private
def direct(*args)
@default_channel.direct(*args)
end
# @private
def fanout(*args)
@default_channel.fanout(*args)
end
# @private
def topic(*args)
@default_channel.topic(*args)
end
# @private
def headers(*args)
@default_channel.headers(*args)
end
# @private
def exchange(*args)
@default_channel.exchange(*args)
end
# Defines a callback that will be executed when RabbitMQ blocks the connection
# because it is running low on memory or disk space (as configured via config file
# and/or rabbitmqctl).
#
# @yield [GorgonAMQ::Protocol::Connection::Blocked] connection.blocked method which provides a reason for blocking
#
# @api public
def on_blocked(&block)
@block_callback = block
end
# Defines a callback that will be executed when RabbitMQ unblocks the connection
# that was previously blocked, e.g. because the memory or disk space alarm has cleared.
#
# @see #on_blocked
# @api public
def on_unblocked(&block)
@unblock_callback = block
end
# @return [Boolean] true if the connection is currently blocked by RabbitMQ because it's running low on
# RAM, disk space, or other resource; false otherwise
# @see #on_blocked
# @see #on_unblocked
def blocked?
@blocked
end
# Parses an amqp[s] URI into a hash that {GorgonBunny::Session#initialize} accepts.
#
# @param [String] uri amqp or amqps URI to parse
# @return [Hash] Parsed URI as a hash
def self.parse_uri(uri)
GorgonAMQ::Settings.parse_amqp_url(uri)
end
# Checks if a queue with given name exists.
#
# Implemented using queue.declare
# with passive set to true and a one-off (short lived) channel
# under the hood.
#
# @param [String] name Queue name
# @return [Boolean] true if queue exists
def queue_exists?(name)
ch = create_channel
begin
ch.queue(name, :passive => true)
true
rescue GorgonBunny::NotFound => _
false
ensure
ch.close if ch.open?
end
end
# Checks if a exchange with given name exists.
#
# Implemented using exchange.declare
# with passive set to true and a one-off (short lived) channel
# under the hood.
#
# @param [String] name Exchange name
# @return [Boolean] true if exchange exists
def exchange_exists?(name)
ch = create_channel
begin
ch.exchange(name, :passive => true)
true
rescue GorgonBunny::NotFound => _
false
ensure
ch.close if ch.open?
end
end
#
# Implementation
#
# @private
def open_channel(ch)
n = ch.number
self.register_channel(ch)
@transport_mutex.synchronize do
@transport.send_frame(GorgonAMQ::Protocol::Channel::Open.encode(n, GorgonAMQ::Protocol::EMPTY_STRING))
end
@last_channel_open_ok = wait_on_continuations
raise_if_continuation_resulted_in_a_connection_error!
@last_channel_open_ok
end
# @private
def close_channel(ch)
n = ch.number
@transport.send_frame(GorgonAMQ::Protocol::Channel::Close.encode(n, 200, "Goodbye", 0, 0))
@last_channel_close_ok = wait_on_continuations
raise_if_continuation_resulted_in_a_connection_error!
self.unregister_channel(ch)
@last_channel_close_ok
end
# @private
def close_all_channels
@channels.reject {|n, ch| n == 0 || !ch.open? }.each do |_, ch|
GorgonBunny::Timeout.timeout(@transport.disconnect_timeout, ClientTimeout) { ch.close }
end
end
# @private
def close_connection(sync = true)
if @transport.open?
@transport.send_frame(GorgonAMQ::Protocol::Connection::Close.encode(200, "Goodbye", 0, 0))
maybe_shutdown_heartbeat_sender
@status = :not_connected
if sync
@last_connection_close_ok = wait_on_continuations
end
end
end
# Handles incoming frames and dispatches them.
#
# Channel methods (`channel.open-ok`, `channel.close-ok`) are
# handled by the session itself.
# Connection level errors result in exceptions being raised.
# Deliveries and other methods are passed on to channels to dispatch.
#
# @private
def handle_frame(ch_number, method)
@logger.debug "Session#handle_frame on #{ch_number}: #{method.inspect}"
case method
when GorgonAMQ::Protocol::Channel::OpenOk then
@continuations.push(method)
when GorgonAMQ::Protocol::Channel::CloseOk then
@continuations.push(method)
when GorgonAMQ::Protocol::Connection::Close then
@last_connection_error = instantiate_connection_level_exception(method)
@continuations.push(method)
@origin_thread.raise(@last_connection_error)
when GorgonAMQ::Protocol::Connection::CloseOk then
@last_connection_close_ok = method
begin
@continuations.clear
rescue StandardError => e
@logger.error e.class.name
@logger.error e.message
@logger.error e.backtrace
ensure
@continuations.push(:__unblock__)
end
when GorgonAMQ::Protocol::Connection::Blocked then
@blocked = true
@block_callback.call(method) if @block_callback
when GorgonAMQ::Protocol::Connection::Unblocked then
@blocked = false
@unblock_callback.call(method) if @unblock_callback
when GorgonAMQ::Protocol::Channel::Close then
begin
ch = @channels[ch_number]
ch.handle_method(method)
ensure
self.unregister_channel(ch)
end
when GorgonAMQ::Protocol::Basic::GetEmpty then
@channels[ch_number].handle_basic_get_empty(method)
else
if ch = @channels[ch_number]
ch.handle_method(method)
else
@logger.warn "Channel #{ch_number} is not open on this connection!"
end
end
end
# @private
def raise_if_continuation_resulted_in_a_connection_error!
raise @last_connection_error if @last_connection_error
end
# @private
def handle_frameset(ch_number, frames)
method = frames.first
case method
when GorgonAMQ::Protocol::Basic::GetOk then
@channels[ch_number].handle_basic_get_ok(*frames)
when GorgonAMQ::Protocol::Basic::GetEmpty then
@channels[ch_number].handle_basic_get_empty(*frames)
when GorgonAMQ::Protocol::Basic::Return then
@channels[ch_number].handle_basic_return(*frames)
else
@channels[ch_number].handle_frameset(*frames)
end
end
# @private
def handle_network_failure(exception)
raise NetworkErrorWrapper.new(exception) unless @threaded
@status = :disconnected
if !recovering_from_network_failure?
@recovering_from_network_failure = true
if recoverable_network_failure?(exception)
@logger.warn "Recovering from a network failure..."
@channels.each do |n, ch|
ch.maybe_kill_consumer_work_pool!
end
maybe_shutdown_heartbeat_sender
recover_from_network_failure
else
# TODO: investigate if we can be a bit smarter here. MK.
end
end
end
# @private
def recoverable_network_failure?(exception)
# TODO: investigate if we can be a bit smarter here. MK.
true
end
# @private
def recovering_from_network_failure?
@recovering_from_network_failure
end
# @private
def recover_from_network_failure
begin
sleep @network_recovery_interval
@logger.debug "About to start connection recovery..."
self.initialize_transport
self.start
if open?
@recovering_from_network_failure = false
recover_channels
end
rescue TCPConnectionFailed, GorgonAMQ::Protocol::EmptyResponseError => e
@logger.warn "TCP connection failed, reconnecting in 5 seconds"
sleep @network_recovery_interval
retry if recoverable_network_failure?(e)
end
end
# @private
def recover_channels
# default channel is reopened right after connection
# negotiation is completed, so make sure we do not try to open
# it twice. MK.
@channels.reject { |n, ch| ch == @default_channel }.each do |n, ch|
ch.open
ch.recover_from_network_failure
end
end
# @private
def instantiate_connection_level_exception(frame)
case frame
when GorgonAMQ::Protocol::Connection::Close then
klass = case frame.reply_code
when 320 then
ConnectionForced
when 501 then
FrameError
when 503 then
CommandInvalid
when 504 then
ChannelError
when 505 then
UnexpectedFrame
when 506 then
ResourceError
when 541 then
InternalError
else
raise "Unknown reply code: #{frame.reply_code}, text: #{frame.reply_text}"
end
klass.new("Connection-level error: #{frame.reply_text}", self, frame)
end
end
# @private
def hostname_from(options)
options[:host] || options[:hostname] || DEFAULT_HOST
end
# @private
def port_from(options)
fallback = if options[:tls] || options[:ssl]
GorgonAMQ::Protocol::TLS_PORT
else
GorgonAMQ::Protocol::DEFAULT_PORT
end
options.fetch(:port, fallback)
end
# @private
def vhost_from(options)
options[:virtual_host] || options[:vhost] || DEFAULT_VHOST
end
# @private
def username_from(options)
options[:username] || options[:user] || DEFAULT_USER
end
# @private
def password_from(options)
options[:password] || options[:pass] || options[:pwd] || DEFAULT_PASSWORD
end
# @private
def heartbeat_from(options)
options[:heartbeat] || options[:heartbeat_interval] || options[:requested_heartbeat] || DEFAULT_HEARTBEAT
end
# @private
def next_channel_id
@channel_id_allocator.next_channel_id
end
# @private
def release_channel_id(i)
@channel_id_allocator.release_channel_id(i)
end
# @private
def register_channel(ch)
@channel_mutex.synchronize do
@channels[ch.number] = ch
end
end
# @private
def unregister_channel(ch)
@channel_mutex.synchronize do
n = ch.number
self.release_channel_id(n)
@channels.delete(ch.number)
end
end
# @private
def start_reader_loop
reader_loop.start
end
# @private
def reader_loop
@reader_loop ||= ReaderLoop.new(@transport, self, Thread.current)
end
# @private
def maybe_shutdown_reader_loop
if @reader_loop
@reader_loop.stop
if threaded?
# this is the easiest way to wait until the loop
# is guaranteed to have terminated
@reader_loop.raise(ShutdownSignal)
# joining the thread here may take forever
# on JRuby because sun.nio.ch.KQueueArrayWrapper#kevent0 is
# a native method that cannot be (easily) interrupted.
# So we use this ugly hack or else our test suite takes forever
# to run on JRuby (a new connection is opened/closed per example). MK.
if defined?(JRUBY_VERSION)
sleep 0.075
else
@reader_loop.join
end
else
# single threaded mode, nothing to do. MK.
end
end
@reader_loop = nil
end
# @private
def close_transport
begin
@transport.close
rescue StandardError => e
@logger.error "Exception when closing transport:"
@logger.error e.class.name
@logger.error e.message
@logger.error e.backtrace
end
end
# @private
def signal_activity!
@heartbeat_sender.signal_activity! if @heartbeat_sender
end
# Sends frame to the peer, checking that connection is open.
# Exposed primarily for GorgonBunny::Channel
#
# @raise [ConnectionClosedError]
# @private
def send_frame(frame, signal_activity = true)
if open?
@transport.write(frame.encode)
signal_activity! if signal_activity
else
raise ConnectionClosedError.new(frame)
end
end
# Sends frame to the peer, checking that connection is open.
# Uses transport implementation that does not perform
# timeout control. Exposed primarily for GorgonBunny::Channel.
#
# @raise [ConnectionClosedError]
# @private
def send_frame_without_timeout(frame, signal_activity = true)
if open?
@transport.write_without_timeout(frame.encode)
signal_activity! if signal_activity
else
raise ConnectionClosedError.new(frame)
end
end
# Sends multiple frames, one by one. For thread safety this method takes a channel
# object and synchronizes on it.
#
# @private
def send_frameset(frames, channel)
# some developers end up sharing channels between threads and when multiple
# threads publish on the same channel aggressively, at some point frames will be
# delivered out of order and broker will raise 505 UNEXPECTED_FRAME exception.
# If we synchronize on the channel, however, this is both thread safe and pretty fine-grained
# locking. Note that "single frame" methods do not need this kind of synchronization. MK.
channel.synchronize do
frames.each { |frame| self.send_frame(frame, false) }
signal_activity!
end
end # send_frameset(frames)
# Sends multiple frames, one by one. For thread safety this method takes a channel
# object and synchronizes on it. Uses transport implementation that does not perform
# timeout control.
#
# @private
def send_frameset_without_timeout(frames, channel)
# some developers end up sharing channels between threads and when multiple
# threads publish on the same channel aggressively, at some point frames will be
# delivered out of order and broker will raise 505 UNEXPECTED_FRAME exception.
# If we synchronize on the channel, however, this is both thread safe and pretty fine-grained
# locking. Note that "single frame" methods do not need this kind of synchronization. MK.
channel.synchronize do
frames.each { |frame| self.send_frame_without_timeout(frame, false) }
signal_activity!
end
end # send_frameset_without_timeout(frames)
# @private
def send_raw_without_timeout(data, channel)
# some developers end up sharing channels between threads and when multiple
# threads publish on the same channel aggressively, at some point frames will be
# delivered out of order and broker will raise 505 UNEXPECTED_FRAME exception.
# If we synchronize on the channel, however, this is both thread safe and pretty fine-grained
# locking. Note that "single frame" methods do not need this kind of synchronization. MK.
channel.synchronize do
@transport.write(data)
signal_activity!
end
end # send_frameset_without_timeout(frames)
# @return [String]
# @api public
def to_s
"#<#{self.class.name}:#{object_id} #{@user}@#{@host}:#{@port}, vhost=#{@vhost}>"
end
protected
# @private
def init_connection
self.send_preamble
connection_start = @transport.read_next_frame.decode_payload
@server_properties = connection_start.server_properties
@server_capabilities = @server_properties["capabilities"]
@server_authentication_mechanisms = (connection_start.mechanisms || "").split(" ")
@server_locales = Array(connection_start.locales)
@status = :connected
end
# @private
def open_connection
@transport.send_frame(GorgonAMQ::Protocol::Connection::StartOk.encode(@client_properties, @mechanism, self.encode_credentials(username, password), @locale))
@logger.debug "Sent connection.start-ok"
frame = begin
@transport.read_next_frame
# frame timeout means the broker has closed the TCP connection, which it
# does per 0.9.1 spec.
rescue Errno::ECONNRESET, ClientTimeout, GorgonAMQ::Protocol::EmptyResponseError, EOFError, IOError => e
nil
end
if frame.nil?
@state = :closed
@logger.error "RabbitMQ closed TCP connection before AMQP 0.9.1 connection was finalized. Most likely this means authentication failure."
raise GorgonBunny::PossibleAuthenticationFailureError.new(self.user, self.vhost, self.password.size)
end
response = frame.decode_payload
if response.is_a?(GorgonAMQ::Protocol::Connection::Close)
@state = :closed
@logger.error "Authentication with RabbitMQ failed: #{response.reply_code} #{response.reply_text}"
raise GorgonBunny::AuthenticationFailureError.new(self.user, self.vhost, self.password.size)
end
connection_tune = response
@frame_max = negotiate_value(@client_frame_max, connection_tune.frame_max)
@channel_max = negotiate_value(@client_channel_max, connection_tune.channel_max)
# this allows for disabled heartbeats. MK.
@heartbeat = if heartbeat_disabled?(@client_heartbeat)
0
else
negotiate_value(@client_heartbeat, connection_tune.heartbeat)
end
@logger.debug "Heartbeat interval negotiation: client = #{@client_heartbeat}, server = #{connection_tune.heartbeat}, result = #{@heartbeat}"
@logger.info "Heartbeat interval used (in seconds): #{@heartbeat}"
@channel_id_allocator = ChannelIdAllocator.new(@channel_max)
@transport.send_frame(GorgonAMQ::Protocol::Connection::TuneOk.encode(@channel_max, @frame_max, @heartbeat))
@logger.debug "Sent connection.tune-ok with heartbeat interval = #{@heartbeat}, frame_max = #{@frame_max}, channel_max = #{@channel_max}"
@transport.send_frame(GorgonAMQ::Protocol::Connection::Open.encode(self.vhost))
@logger.debug "Sent connection.open with vhost = #{self.vhost}"
frame2 = begin
@transport.read_next_frame
# frame timeout means the broker has closed the TCP connection, which it
# does per 0.9.1 spec.
rescue Errno::ECONNRESET, ClientTimeout, GorgonAMQ::Protocol::EmptyResponseError, EOFError => e
nil
end
if frame2.nil?
@state = :closed
@logger.warn "RabbitMQ closed TCP connection before AMQP 0.9.1 connection was finalized. Most likely this means authentication failure."
raise GorgonBunny::PossibleAuthenticationFailureError.new(self.user, self.vhost, self.password.size)
end
connection_open_ok = frame2.decode_payload
@status = :open
if @heartbeat && @heartbeat > 0
initialize_heartbeat_sender
end
raise "could not open connection: server did not respond with connection.open-ok" unless connection_open_ok.is_a?(GorgonAMQ::Protocol::Connection::OpenOk)
end
def heartbeat_disabled?(val)
0 == val || val.nil?
end
# @private
def negotiate_value(client_value, server_value)
return server_value if client_value == :server
if client_value == 0 || server_value == 0
[client_value, server_value].max
else
[client_value, server_value].min
end
end
# @private
def initialize_heartbeat_sender
@logger.debug "Initializing heartbeat sender..."
@heartbeat_sender = HeartbeatSender.new(@transport, @logger)
@heartbeat_sender.start(@heartbeat)
end
# @private
def maybe_shutdown_heartbeat_sender
@heartbeat_sender.stop if @heartbeat_sender
end
# @private
def initialize_transport
@transport = Transport.new(self, @host, @port, @opts.merge(:session_thread => @origin_thread))
end
# @private
def maybe_close_transport
@transport.close if @transport
end
# Sends AMQ protocol header (also known as preamble).
# @private
def send_preamble
@transport.write(GorgonAMQ::Protocol::PREAMBLE)
@logger.debug "Sent protocol preamble"
end
# @private
def encode_credentials(username, password)
@credentials_encoder.encode_credentials(username, password)
end # encode_credentials(username, password)
# @private
def credentials_encoder_for(mechanism)
Authentication::CredentialsEncoder.for_session(self)
end
if defined?(JRUBY_VERSION)
# @private
def reset_continuations
@continuations = Concurrent::LinkedContinuationQueue.new
end
else
# @private
def reset_continuations
@continuations = Concurrent::ContinuationQueue.new
end
end
# @private
def wait_on_continuations
unless @threaded
reader_loop.run_once until @continuations.length > 0
end
@continuations.poll(@continuation_timeout)
end
# @private
def init_logger(level)
@logger = ::Logger.new(@logfile)
@logger.level = normalize_log_level(level)
@logger.progname = self.to_s
@logger
end
# @private
def normalize_log_level(level)
case level
when :debug, Logger::DEBUG, "debug" then Logger::DEBUG
when :info, Logger::INFO, "info" then Logger::INFO
when :warn, Logger::WARN, "warn" then Logger::WARN
when :error, Logger::ERROR, "error" then Logger::ERROR
when :fatal, Logger::FATAL, "fatal" then Logger::FATAL
else
Logger::WARN
end
end
end # Session
# backwards compatibility
Client = Session
end