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"""Core connection objects"""
import logging
import platform
from pika import __version__
from pika import callback
from pika import channel
from pika import credentials as pika_credentials
from pika import exceptions
from pika import frame
from pika import heartbeat
from pika import utils
from pika import simplebuffer
from pika import spec
BACKPRESSURE_WARNING = ("Pika: Write buffer exceeded warning threshold at "
"%i bytes and an estimated %i frames behind")
PRODUCT = "Pika Python Client Library"
LOGGER = logging.getLogger(__name__)
class ConnectionParameters(object):
"""Connection parameters object that is passed into the connection adapter
upon construction.
def __init__(self,
"""Create a new ConnectionParameters instance.
:param str host: Hostname or IP Address to connect to.
Defaults to localhost.
:param int port: TCP port to connect to.
Defaults to 5672
:param str virtual_host: RabbitMQ virtual host to use.
Defaults to /
:param pika.credentials.Credentials credentials: A instance of a
credentials class to authenticate with.
Defaults to PlainCredentials for the guest user.
:param int channel_max: Maximum number of channels to allow,.
Defaults to 0 for None
:param int frame_max: The maximum byte size for an AMQP frame.
Defaults to 131072
:param int heartbeat_interval: Heartbeat Interval. 0 for heartbeat off.
Defaults to 0
:param bool ssl: Enable SSL
Defaults to False
:param dict ssl_options: Arguments passed to ssl.wrap_socket as
described at
:param int connection_attempts: Maximum number of retry attempts.
None for infinite. Defaults to 1
:param int|float retry_delay: Time to wait in seconds, before the next
attempt. Defaults to 2
:param int|float socket_timeout: Use for high latency networks
Defaults to 0.25
:param str locale: Set the locale value
Defaults to en_US
:raises: InvalidFrameSize
:raises: TypeError
if not isinstance(host, str):
raise TypeError("Host must be a str")
if not isinstance(port, int):
raise TypeError("Port must be an int")
if not credentials:
credentials = pika_credentials.PlainCredentials('guest', 'guest')
if not isinstance(channel_max, int):
raise TypeError("max-channels must be an int")
if not isinstance(frame_max, int):
raise TypeError("frame_max must be an int")
if frame_max < spec.FRAME_MIN_SIZE:
raise exceptions.InvalidMinimumFrameSize
elif frame_max > spec.FRAME_MAX_SIZE:
raise exceptions.InvalidMaximumFrameSize
if not isinstance(frame_max, int):
raise TypeError("frame_max must be an int")
if not isinstance(heartbeat_interval, int):
raise TypeError("heartbeat must be an int")
if not isinstance(ssl, bool):
raise TypeError("ssl must be a bool")
if not isinstance(ssl_options, dict) and ssl_options is not None:
raise TypeError("ssl_options must be either None or dict")
if (connection_attempts is not None and
not isinstance(connection_attempts, int)):
raise TypeError("connection_attempts must be either None or int")
if (not isinstance(retry_delay, int) and
not isinstance(retry_delay, float)):
raise TypeError("retry_delay must be a float or int")
if (not isinstance(socket_timeout, int) and
not isinstance(socket_timeout, float)):
raise TypeError("socket_timeout must be a float or int")
# Assign the values = host
self.port = port
self.virtual_host = virtual_host
self.credentials = credentials
self.channel_max = channel_max
self.frame_max = frame_max
self.locale = locale
self.heartbeat = heartbeat_interval
self.ssl = ssl
self.ssl_options = ssl_options or dict()
self.connection_attempts = connection_attempts
self.retry_delay = retry_delay
self.socket_timeout = socket_timeout
def _validate_credentials(self, credentials):
"""Validate the credentials passed in are using a valid object type.
:param pika.credentials.Credentials credentials: Credentials to validate
:raises: TypeError
for credential_type in pika_credentials.VALID_TYPES:
if isinstance(credentials, credential_type):
raise TypeError('Credentials must be an object of type: %r' %
class Connection(object):
"""This is the core class that implements communication with RabbitMQ. This
class should not be invoked directly but rather through the use of an
adapter such as SelectConnection or BlockingConnection.
def __init__(self, parameters=None,
"""Connection initialization expects a ConnectionParameters object and
a callback function to notify when we have successfully connected
to the AMQP Broker.
:param parameters: Connection parameters
:type parameters: pika.connection.ConnectionParameters
:param on_open_callback: The method to call when the connection is open
:type on_open_callback: method
# Define our callback dictionary
self.callbacks = callback.CallbackManager()
# On connection callback
if on_open_callback:
# Set our configuration options
self.params = parameters or ConnectionParameters()
# Initialize the connection state and connect
def add_backpressure_callback(self, callback_method):
"""Call method "callback" when pika believes backpressure is being
:param method callback_method: The method to call
self.callbacks.add(0, 'backpressure', callback_method, False)
def add_on_close_callback(self, callback_method):
"""Add a callback notification when the connection has closed.
:param method callback_method: The callback when the channel is opened
self.callbacks.add(0, '_on_connection_closed', callback_method, False)
def add_on_open_callback(self, callback_method):
"""Add a callback notification when the connection has opened.
:param method callback_method: The callback when the channel is opened
self.callbacks.add(0, '_on_connection_open', callback_method, False)
def add_timeout(self, deadline, callback_method):
"""Adapters should override to call the callback after the
specified number of seconds have elapsed, using a timer, or a
thread, or similar.
:param int deadline: The number of seconds to wait to call callback
:param method callback_method: The callback method
raise NotImplementedError
def channel(self, on_open_callback, channel_number=None):
"""Create a new channel with the next available channel number or pass
in a channel number to use. Must be non-zero if you would like to
specify but it is recommended that you let Pika manage the channel
:param method on_open_callback: The callback when the channel is opened
:param int channel_number: The channel number to use, defaults to the
next available.
if not channel_number:
channel_number = self._next_channel_number()
self._channels[channel_number] = self._create_channel(channel_number,
def close(self, reply_code=200, reply_text='Normal shutdown'):
"""Disconnect from RabbitMQ. If there are any open channels, it will
attempt to close them prior to fully disconnecting. Channels which
have active consumers will attempt to send a Basic.Cancel to RabbitMQ
to cleanly stop the delivery of messages prior to closing the channel.
:param int reply_code: The code number for the close
:param str reply_text: The text reason for the close
if self.is_closing or self.is_closed:
LOGGER.warning("Invoked while closing or closed")
# Set our connection state
self._set_connection_state(self.CONNECTION_CLOSING)"Closing connection (%s): %s", reply_code, reply_text)
self.closing = reply_code, reply_text
# If channels are open, _on_close_ready will be called when they close
if self._has_open_channels:
return self._close_channels(reply_code, reply_text, False)
def remove_timeout(self, callback_method):
"""Adapters should override to call the callback after the
specified number of seconds have elapsed, using a timer, or a
thread, or similar.
:param method callback_method: The callback to remove a timeout for
raise NotImplementedError
def set_backpressure_multiplier(self, value=10):
"""Alter the backpressure multiplier value. We set this to 10 by default.
This value is used to raise warnings and trigger the backpressure
:param int value: The multiplier value to set
self._backpressure = value
# Connections state properties
def is_closed(self):
Returns a boolean reporting the current connection state.
return self.connection_state == self.CONNECTION_CLOSED
def is_closing(self):
Returns a boolean reporting the current connection state.
return self.connection_state == self.CONNECTION_CLOSING
def is_open(self):
Returns a boolean reporting the current connection state.
return self.connection_state == self.CONNECTION_OPEN
# Properties that reflect server capabilities for the current connection
def basic_nack(self):
"""Specifies if the server supports basic.nack on the active connection.
:rtype: bool
return self.server_capabilities.get('basic.nack', False)
def consumer_cancel_notify(self):
"""Specifies if the server supports consumer cancel notification on the
active connection.
:rtype: bool
return self.server_capabilities.get('consumer_cancel_notify', False)
def exchange_exchange_bindings(self):
"""Specifies if the active connection supports exchange to exchange
:rtype: bool
return self.server_capabilities.get('exchange_exchange_bindings',
def publisher_confirms(self):
"""Specifies if the active connection can use publisher confirmations.
:rtype: bool
return self.server_capabilities.get('publisher_confirms', False)
# Internal methods for managing the communication process
def _adapter_connect(self):
"""Subclasses should override to set up the outbound socket connection.
:raises: NotImplementedError
raise NotImplementedError
def _adapter_disconnect(self):
"""Subclasses should override this to cause the underlying transport
(socket) to close.
:raises: NotImplementedError
raise NotImplementedError
def _add_channel_callbacks(self, channel_number):
"""Add the appropriate callbacks for the specified channel number.
:param int channel_number: The channel number for the callbacks
def _add_connection_start_callback(self):
"""Add a callback for when a Connection.Start frame is received from
the broker.
self.callbacks.add(0, spec.Connection.Start, self._on_connection_start)
def _add_connection_tune_callback(self):
"""Add a callback for when a Connection.Tune frame is received."""
self.callbacks.add(0, spec.Connection.Tune, self._on_connection_tune)
def _append_frame_buffer(self, bytes):
"""Append the bytes to the frame buffer.
:param str bytes: The bytes to append to the frame buffer
self._frame_buffer += bytes
def _buffer_size(self):
"""Return the suggested buffer size from the connection state/tune or
the default if that is None.
:rtype: int
return self.params.frame_max or spec.FRAME_MAX_SIZE
def _check_for_protocol_mismatch(self, value):
"""Invoked when starting a connection to make sure it's a supported
:param pika.frame.Method value: The frame to check
:raises: ProtocolVersionMismatch
if (value.method.version_major,
value.method.version_minor) != spec.PROTOCOL_VERSION[0:2]:
raise exceptions.ProtocolVersionMismatch(frame.ProtocolHeader(),
def _client_properties(self):
"""Return the client properties dictionary.
:rtype: dict
return {'product': PRODUCT,
'platform': 'Python %s' % platform.python_version(),
'capabilities': {'basic.nack': True,
'consumer_cancel_notify': True,
'publisher_confirms': True},
'information': 'See',
'version': __version__}
def _close_channel(self, channel_number, reply_code, reply_text,
"""Close the specified channel number in response to the broker sending
a Channel.Close. If remote is True, Close.Ok will be sent
:param int channel_number: The channel number to close
:param int reply_code: The Channel.Close reply code from RabbitMQ
:param str reply_text: The Channel.Close reply text from RabbitMQ
:param bool remote: The close was due to a remote close
if self.is_open:'Closing channel %i due to remote close (%s): %s',
channel_number, reply_code, reply_text)
self._channels[channel_number].close(reply_code, reply_text, remote)
if remote:
def _close_channels(self, reply_code, reply_text, remote=False):
"""Close the open channels with the specified reply_code and reply_text.
:param int reply_code: The code for why the channels are being closed
:param str reply_text: The text reason for why the channels are closing
if self.is_open:
for channel_number in self._channels.keys():
if self._channels[channel_number].is_open:
self._close_channel(channel_number, reply_code,
reply_text, remote)
del self._channels[channel_number]
del self._channels
self._channels = dict()
def _combine(self, a, b):
"""Pass in two values, if a is 0, return b otherwise if b is 0,
return a. If neither case matches return the smallest value.
:param int a: The first value
:param int b: The second value
:rtype: int
return min(a, b) or (a or b)
def _connect(self):
"""Call the Adapter's connect method after letting the
ReconnectionStrategy know.
LOGGER.debug('Attempting connection')
def _create_channel(self, channel_number, on_open_callback):
"""Create a new channel using the specified channel number and calling
back the method specified by on_open_callback
:param int channel_number: The channel number to use
:param method on_open_callback: The callback when the channel is opened
return channel.Channel(self, channel_number, on_open_callback)
def _create_heartbeat_checker(self):
"""Create a heartbeat checker instance if there is a heartbeat interval
:rtype: pika.heartbeat.Heartbeat
LOGGER.debug('Creating a HeartbeatChecker')
if self.params.heartbeat:
return heartbeat.HeartbeatChecker(self, self.params.heartbeat)
def _deliver_frame_to_channel(self, value):
"""Deliver the frame to the channel specified in the frame.
:param pika.frame.Method value: The frame to deliver
if value.channel_number in self._channels:
return self._channels[value.channel_number].transport.deliver(value)
if self._is_basic_deliver_frame(value):
LOGGER.warning("Received %r for non-existing channel %i",
value, value.channel_number)
def _detect_backpressure(self):
"""Attempt to calculate if TCP backpressure is being applied due to
our outbound buffer being larger than the average frame size over
a window of frames.
avg_frame_size = self.bytes_sent / self.frames_sent
if self.outbound_buffer.size > (avg_frame_size * self._backpressure):
int(self.outbound_buffer.size / avg_frame_size))
self.callbacks.process(0, 'backpressure', self)
def _ensure_closed(self):
"""If the connection is not closed, close it."""
if self.is_open:
def _flush_outbound(self):
"""Adapters should override to flush the contents of outbound_buffer
out along the socket.
:raises: NotImplementedError
raise NotImplementedError
def _get_body_frame_max_length(self):
"""Calculate the maximum amount of bytes that can be in a body frame.
:rtype: int
return (self.params.frame_max -
def _get_credentials(self, method_frame):
"""Get credentials for authentication.
:param pika.frame.MethodFrame method_frame: The Connection.Start frame
:rtype: tuple(str, str)
response) = self.params.credentials.response_for(method_frame.method)
if not auth_type:
raise exceptions.AuthenticationError(self.params.credentials.TYPE)
return auth_type, response
def _has_open_channels(self):
"""Returns true if channels are open.
:rtype: bool
return bool(self._channels)
def _has_pending_callbacks(self, value):
"""Return true if there are any callbacks pending for the specified
:param pika.frame.Method value: The frame to check
:rtype: bool
return self.callbacks.pending(value.channel_number, value.method)
def _init_connection_state(self):
"""Initialize or reset all of the internal state variables for a given
connection. On disconnect or reconnect all of the state needs to
be wiped.
# Outbound buffer for buffering writes until we're able to send them
self.outbound_buffer = simplebuffer.SimpleBuffer()
# Inbound buffer for decoding frames
self._frame_buffer = ''
# Connection state, server properties and channels all change on
# each connection
self.server_properties = None
self._channels = dict()
# Data used for Heartbeat checking and back-pressure detection
self.bytes_sent = 0
self.bytes_received = 0
self.frames_sent = 0
self.frames_received = 0
self.heartbeat = None
# Default back-pressure multiplier value
self._backpressure = 10
# Connection state
# When closing, hold reason why
self.closing = 0, ''
# Our starting point once connected, first frame received
def _is_basic_deliver_frame(self, frame_value):
"""Returns true if the frame is a Basic.Deliver
:param pika.frame.Method frame_value: The frame to check
:rtype: bool
return isinstance(frame_value, spec.Basic.Deliver)
def _is_channel_close_frame(self, value):
"""Returns true if the frame is a Channel.Close frame.
:param pika.frame.Method value: The frame to check
:rtype: bool
return isinstance(value.method, spec.Channel.Close)
def _is_connection_close_frame(self, value):
"""Returns true if the frame is a Connection.Close frame.
:param pika.frame.Method value: The frame to check
:rtype: bool
if not value:
return False
return isinstance(value.method, spec.Connection.Close)
def _is_method_frame(self, value):
"""Returns true if the frame is a method frame.
:param pika.frame.Frame value: The frame to evaluate
:rtype: bool
return isinstance(value, frame.Method)
def _is_protocol_header_frame(self, value):
"""Returns True if it's a protocol header frame.
:rtype: bool
return isinstance(value, frame.ProtocolHeader)
def _next_channel_number(self):
"""Return the next available channel number or raise on exception.
:rtype: int
limit = self.params.channel_max or channel.MAX_CHANNELS
if len(self._channels) == limit:
raise exceptions.NoFreeChannels()
if not self._channels:
return 1
return max(self._channels.keys()) + 1
def _on_channel_close(self, method_frame):
"""Handle a RPC request from the server to close the channel.
:param frame pika.frame.Method method_frame: The frame received
channel_number = method_frame.channel_number
if (self.is_open and channel_number in self._channels and
del self._channels[channel_number]
if self.is_closing and not self._channels:
def _on_close_ready(self):
"""Called when the Connection is in a state that it can close after
a close has been requested. This happens, for example, when all of the
channels are closed that were open when the close request was made.
if self.is_closed:
LOGGER.warning('Invoked while already closed')
self._send_connection_close(self.closing[0], self.closing[1])
def _on_connected(self):
This is called by our connection Adapter to let us know that we've
connected and we can notify our connection strategy.
# Start the communication with the RabbitMQ Broker
def _on_connection_closed(self, method_frame, from_adapter=False):
"""Called when the connection is closed remotely. The from_adapter value
will be true if the connection adapter has been disconnected from
the broker and the method was invoked directly instead of by receiving
a Connection.Close frame.
:param pika.frame.Method: The Connection.Close frame
:param bool from_adapter: Called by the connection adapter
if method_frame and self._is_connection_close_frame(method_frame):
self.closing = (method_frame.method.reply_code,
LOGGER.warning("Disconnected from RabbitMQ at %s:%i (%s): %s",, self.params.port,
self.closing[0], self.closing[1])
if not from_adapter:
for channel in self._channels:
def _on_connection_open(self, method_frame):
This is called once we have tuned the connection with the server and
called the Connection.Open on the server and it has replied with
self.known_hosts = method_frame.method.known_hosts
# Add a callback handler for the Broker telling us to disconnect
self.callbacks.add(0, spec.Connection.Close, self._on_connection_closed)
# We're now connected at the AMQP level
# Call our initial callback that we're open
self.callbacks.process(0, '_on_connection_open', self, self)
def _on_connection_start(self, method_frame):
"""This is called as a callback once we have received a Connection.Start
from the server.
:param pika.frame.Method method_frame: The frame received
:raises: UnexpectedFrameError
if self._is_protocol_header_frame(method_frame):
raise exceptions.UnexpectedFrameError
def _on_connection_tune(self, method_frame):
"""Once the Broker sends back a Connection.Tune, we will set our tuning
variables that have been returned to us and kick off the Heartbeat
monitor if required, send our TuneOk and then the Connection. Open rpc
call on channel 0.
:param pika.frame.Method method_frame: The frame received
# Get our max channels, frames and heartbeat interval
self.params.channel_max = self._combine(self.params.channel_max,
self.params.frame_max = self._combine(self.params.frame_max,
self.params.heartbeat = self._combine(self.params.heartbeat,
# Calculate the maximum pieces for body frames
self._body_max_length = self._get_body_frame_max_length()
# Create a new heartbeat checker if needed
self.heartbeat = self._create_heartbeat_checker()
# Send the TuneOk response with what we've agreed upon
# Send the Connection.Open RPC call for the vhost
def _on_data_available(self, data_in):
"""This is called by our Adapter, passing in the data from the socket.
As long as we have buffer try and map out frame data.
:param str data_in: The data that is available to read
while self._frame_buffer:
consumed_count, frame_value = self._read_frame()
if not frame_value:
def _process_callbacks(self, frame_value):
"""Process the callbacks for the frame if the frame is a method frame
and if it has any callbacks pending.
:param pika.frame.Method frame_value: The frame to process
:rtype: bool
if (self._is_method_frame(frame_value) and
self.callbacks.process(frame_value.channel_number, # Prefix
frame_value.method, # Key
self, # Caller
frame_value) # Args
return True
return False
def _process_connection_closed_callbacks(self):
"""Process any callbacks that should be called when the connection is
self.callbacks.process(0, '_on_connection_closed', self, self)
def _process_frame(self, frame_value):
"""Process an inbound frame from the socket.
:param frame_value: The frame to process
:type frame_value: pika.frame.Frame | pika.frame.Method
# Will receive a frame type of -1 if protocol version mismatch
if frame_value.frame_type < 0:
# Keep track of how many frames have been read
self.frames_received += 1
# If we have a Method Frame and have callbacks for it
if self._process_callbacks(frame_value):
# If a heartbeat is received, update the checker
if isinstance(frame_value, frame.Heartbeat):
if self.heartbeat:
LOGGER.warning('Received heartbeat frame without a heartbeat '
# If the frame has a channel number beyond the base channel, deliver it
elif frame_value.channel_number > 0:
def _read_frame(self):
"""Try and read from the frame buffer and decode a frame.
:rtype tuple: (int, pika.frame.Frame)
return frame.decode_frame(self._frame_buffer)
def _reject_out_of_band_delivery(self, channel_number, delivery_tag):
"""Reject a delivery on the specified channel number and delivery tag
because said channel no longer exists.
:param int channel_number: The channel number
:param int delivery_tag: The delivery tag
LOGGER.warning('Rejected out-of-band delivery on channel %i (%s)',
channel_number, delivery_tag)
self._send_method(channel_number, spec.Basic.Reject(delivery_tag))
def _remove_callback(self, channel_number, method_frame):
"""Remove the specified method_frame callback if it is set for the
specified channel number.
:param int channel_number: The channel number to remove the callback on
:param pika.object.Method: The method frame for the callback
self.callbacks.remove(str(channel_number), method_frame)
def _remove_callbacks(self, channel_number, method_frames):
"""Remove the callbacks for the specified channel number and list of
method frames.
:param int channel_number: The channel number to remove the callback on
:param list method_frames: The method frames for the callback
for method_frame in method_frames:
self._remove_callback(channel_number, method_frame)
def _remove_connection_callbacks(self):
"""Remove all callbacks for the connection"""
self._remove_callbacks(0, [spec.Connection.Close,
def _rpc(self, channel_number, method_frame,
callback_method=None, acceptable_replies=None):
"""Make an RPC call for the given callback, channel number and method.
acceptable_replies lists out what responses we'll process from the
server with the specified callback.
:param int channel_number: The channel number for the RPC call
:param pika.object.Method method_frame: The method frame to call
:param method callback_method: The callback for the RPC response
:param list acceptable_replies: The replies this RPC call expects
# Validate that acceptable_replies is a list or None
if acceptable_replies and not isinstance(acceptable_replies, list):
raise TypeError("acceptable_replies should be list or None")
# Validate the callback is callable
if callback_method:
if not utils.is_callable(callback_method):
raise TypeError("callback should be None, function or method.")
for reply in acceptable_replies:
self.callbacks.add(channel_number, reply, callback_method)
# Send the rpc call to RabbitMQ
self._send_method(channel_number, method_frame)
def _send_channel_close_ok(self, channel_number):
"""Send a Channel._ frame for the given channel number and remove
the expectation of a Channel.CloseOk in the callbacks for the channel.
:param int channel_number: The channel number to send CloseOk to
if not self.is_closed:
self._rpc(channel_number, spec.Channel.CloseOk())
self._remove_callback(channel_number, spec.Channel.CloseOk)
def _send_connection_close(self, reply_code, reply_text):
"""Send a Connection.Close method frame.
:param int reply_code: The reason for the close
:param str reply_text: The text reason for the close
self._rpc(0, spec.Connection.Close(reply_code, reply_text, 0, 0),
self._on_connection_closed, [spec.Connection.CloseOk])
def _send_connection_open(self):
"""Send a Connection.Open frame"""
self._rpc(0, spec.Connection.Open(self.params.virtual_host,
self._on_connection_open, [spec.Connection.OpenOk])
def _send_connection_start_ok(self, authentication_type, response):
"""Send a Connection.StartOk frame
:param str authentication_type: The auth type value
:param str response: The encoded value to send
self._send_method(0, spec.Connection.StartOk(self._client_properties,
def _send_connection_tune_ok(self):
"""Send a Connection.TuneOk frame"""
self._send_method(0, spec.Connection.TuneOk(self.params.channel_max,
def _send_frame(self, frame_value):
"""This appends the fully generated frame to send to the broker to the
output buffer which will be then sent via the connection adapter.
:param frame_value: The frame to write
:type frame_value: pika.frame.Frame|pika.frame.ProtocolHeader
if self.is_closed:
raise exceptions.ConnectionClosed
marshaled_frame = frame_value.marshal()
self.bytes_sent += len(marshaled_frame)
self.frames_sent += 1
def _send_method(self, channel_number, method_frame, content=None):
"""Constructs a RPC method frame and then sends it to the broker.
:param int channel_number: The channel number for the frame
:param pika.object.Method method_frame: The method frame to send
:param tuple content: If set, is a content frame, is tuple of
properties and body.
LOGGER.debug('Sending on channel %i: %r', channel_number, method_frame)
self._send_frame(frame.Method(channel_number, method_frame))
if isinstance(content, tuple):
if content[1]:
body_buf = simplebuffer.SimpleBuffer(content[1])
while body_buf:
piece_len = min(len(body_buf), self._body_max_length)
piece = body_buf.read_and_consume(piece_len)
self._send_frame(frame.Body(channel_number, piece))
def _set_connection_state(self, connection_state):
"""Set the connection state.
:param int connection_state: The connection state to set
self.connection_state = connection_state
def _set_server_information(self, method_frame):
"""Set the server properties and capabilities
:param spec.connection.Start method_frame: The Connection.Start frame
self.server_properties = method_frame.method.server_properties
self.server_capabilities = self.server_properties.get('capabilities',
if hasattr(self.server_properties, 'capabilities'):
del self.server_properties['capabilities']
def _trim_frame_buffer(self, byte_count):
"""Trim the leading N bytes off the frame buffer and increment the
counter that keeps track of how many bytes have been read/used from the
:param int byte_count: The number of bytes consumed
self._frame_buffer = self._frame_buffer[byte_count:]
self.bytes_received += byte_count
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