979 lines
34 KiB
Python
979 lines
34 KiB
Python
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"""Session object for building, serializing, sending, and receiving messages.
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The Session object supports serialization, HMAC signatures,
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and metadata on messages.
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Also defined here are utilities for working with Sessions:
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* A SessionFactory to be used as a base class for configurables that work with
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Sessions.
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* A Message object for convenience that allows attribute-access to the msg dict.
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"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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from binascii import b2a_hex
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import hashlib
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import hmac
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import logging
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import os
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import pprint
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import random
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import warnings
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from datetime import datetime
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try:
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import cPickle
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pickle = cPickle
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except:
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cPickle = None
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import pickle
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PICKLE_PROTOCOL = pickle.DEFAULT_PROTOCOL
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# We are using compare_digest to limit the surface of timing attacks
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from hmac import compare_digest
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from datetime import timezone
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utc = timezone.utc
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import zmq
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from zmq.utils import jsonapi
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from zmq.eventloop.ioloop import IOLoop
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from zmq.eventloop.zmqstream import ZMQStream
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from traitlets.config.configurable import Configurable, LoggingConfigurable
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from ipython_genutils.importstring import import_item
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from jupyter_client.jsonutil import extract_dates, squash_dates, date_default
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from ipython_genutils.py3compat import (str_to_bytes, str_to_unicode, unicode_type,
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iteritems)
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from traitlets import (
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CBytes, Unicode, Bool, Any, Instance, Set, DottedObjectName, CUnicode,
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Dict, Integer, TraitError, observe
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)
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from jupyter_client import protocol_version
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from jupyter_client.adapter import adapt
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from traitlets.log import get_logger
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#-----------------------------------------------------------------------------
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# utility functions
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#-----------------------------------------------------------------------------
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def squash_unicode(obj):
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"""coerce unicode back to bytestrings."""
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if isinstance(obj,dict):
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for key in obj.keys():
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obj[key] = squash_unicode(obj[key])
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if isinstance(key, unicode_type):
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obj[squash_unicode(key)] = obj.pop(key)
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elif isinstance(obj, list):
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for i,v in enumerate(obj):
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obj[i] = squash_unicode(v)
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elif isinstance(obj, unicode_type):
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obj = obj.encode('utf8')
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return obj
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#-----------------------------------------------------------------------------
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# globals and defaults
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#-----------------------------------------------------------------------------
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# default values for the thresholds:
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MAX_ITEMS = 64
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MAX_BYTES = 1024
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# ISO8601-ify datetime objects
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# allow unicode
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# disallow nan, because it's not actually valid JSON
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json_packer = lambda obj: jsonapi.dumps(obj, default=date_default,
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ensure_ascii=False, allow_nan=False,
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)
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json_unpacker = lambda s: jsonapi.loads(s)
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pickle_packer = lambda o: pickle.dumps(squash_dates(o), PICKLE_PROTOCOL)
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pickle_unpacker = pickle.loads
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default_packer = json_packer
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default_unpacker = json_unpacker
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DELIM = b"<IDS|MSG>"
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# singleton dummy tracker, which will always report as done
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DONE = zmq.MessageTracker()
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#-----------------------------------------------------------------------------
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# Mixin tools for apps that use Sessions
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#-----------------------------------------------------------------------------
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def new_id():
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"""Generate a new random id.
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Avoids problematic runtime import in stdlib uuid on Python 2.
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Returns
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-------
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id string (16 random bytes as hex-encoded text, chunks separated by '-')
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"""
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buf = os.urandom(16)
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return u'-'.join(b2a_hex(x).decode('ascii') for x in (
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buf[:4], buf[4:]
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))
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def new_id_bytes():
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"""Return new_id as ascii bytes"""
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return new_id().encode('ascii')
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session_aliases = dict(
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ident = 'Session.session',
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user = 'Session.username',
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keyfile = 'Session.keyfile',
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)
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session_flags = {
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'secure' : ({'Session' : { 'key' : new_id_bytes(),
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'keyfile' : '' }},
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"""Use HMAC digests for authentication of messages.
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Setting this flag will generate a new UUID to use as the HMAC key.
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"""),
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'no-secure' : ({'Session' : { 'key' : b'', 'keyfile' : '' }},
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"""Don't authenticate messages."""),
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}
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def default_secure(cfg):
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"""Set the default behavior for a config environment to be secure.
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If Session.key/keyfile have not been set, set Session.key to
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a new random UUID.
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"""
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warnings.warn("default_secure is deprecated", DeprecationWarning)
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if 'Session' in cfg:
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if 'key' in cfg.Session or 'keyfile' in cfg.Session:
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return
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# key/keyfile not specified, generate new UUID:
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cfg.Session.key = new_id_bytes()
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def utcnow():
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"""Return timezone-aware UTC timestamp"""
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return datetime.utcnow().replace(tzinfo=utc)
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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class SessionFactory(LoggingConfigurable):
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"""The Base class for configurables that have a Session, Context, logger,
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and IOLoop.
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"""
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logname = Unicode('')
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@observe('logname')
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def _logname_changed(self, change):
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self.log = logging.getLogger(change['new'])
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# not configurable:
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context = Instance('zmq.Context')
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def _context_default(self):
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return zmq.Context()
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session = Instance('jupyter_client.session.Session',
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allow_none=True)
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loop = Instance('tornado.ioloop.IOLoop')
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def _loop_default(self):
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return IOLoop.current()
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def __init__(self, **kwargs):
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super(SessionFactory, self).__init__(**kwargs)
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if self.session is None:
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# construct the session
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self.session = Session(**kwargs)
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class Message(object):
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"""A simple message object that maps dict keys to attributes.
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A Message can be created from a dict and a dict from a Message instance
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simply by calling dict(msg_obj)."""
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def __init__(self, msg_dict):
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dct = self.__dict__
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for k, v in iteritems(dict(msg_dict)):
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if isinstance(v, dict):
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v = Message(v)
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dct[k] = v
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# Having this iterator lets dict(msg_obj) work out of the box.
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def __iter__(self):
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return iter(iteritems(self.__dict__))
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def __repr__(self):
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return repr(self.__dict__)
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def __str__(self):
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return pprint.pformat(self.__dict__)
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def __contains__(self, k):
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return k in self.__dict__
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def __getitem__(self, k):
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return self.__dict__[k]
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def msg_header(msg_id, msg_type, username, session):
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"""Create a new message header"""
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date = utcnow()
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version = protocol_version
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return locals()
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def extract_header(msg_or_header):
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"""Given a message or header, return the header."""
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if not msg_or_header:
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return {}
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try:
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# See if msg_or_header is the entire message.
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h = msg_or_header['header']
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except KeyError:
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try:
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# See if msg_or_header is just the header
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h = msg_or_header['msg_id']
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except KeyError:
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raise
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else:
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h = msg_or_header
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if not isinstance(h, dict):
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h = dict(h)
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return h
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class Session(Configurable):
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"""Object for handling serialization and sending of messages.
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The Session object handles building messages and sending them
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with ZMQ sockets or ZMQStream objects. Objects can communicate with each
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other over the network via Session objects, and only need to work with the
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dict-based IPython message spec. The Session will handle
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serialization/deserialization, security, and metadata.
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Sessions support configurable serialization via packer/unpacker traits,
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and signing with HMAC digests via the key/keyfile traits.
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Parameters
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----------
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debug : bool
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whether to trigger extra debugging statements
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packer/unpacker : str : 'json', 'pickle' or import_string
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importstrings for methods to serialize message parts. If just
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'json' or 'pickle', predefined JSON and pickle packers will be used.
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Otherwise, the entire importstring must be used.
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The functions must accept at least valid JSON input, and output *bytes*.
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For example, to use msgpack:
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packer = 'msgpack.packb', unpacker='msgpack.unpackb'
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pack/unpack : callables
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You can also set the pack/unpack callables for serialization directly.
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session : bytes
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the ID of this Session object. The default is to generate a new UUID.
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username : unicode
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username added to message headers. The default is to ask the OS.
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key : bytes
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The key used to initialize an HMAC signature. If unset, messages
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will not be signed or checked.
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keyfile : filepath
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The file containing a key. If this is set, `key` will be initialized
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to the contents of the file.
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"""
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debug = Bool(False, config=True, help="""Debug output in the Session""")
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check_pid = Bool(True, config=True,
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help="""Whether to check PID to protect against calls after fork.
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This check can be disabled if fork-safety is handled elsewhere.
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""")
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packer = DottedObjectName('json',config=True,
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help="""The name of the packer for serializing messages.
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Should be one of 'json', 'pickle', or an import name
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for a custom callable serializer.""")
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@observe('packer')
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def _packer_changed(self, change):
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new = change['new']
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if new.lower() == 'json':
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self.pack = json_packer
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self.unpack = json_unpacker
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self.unpacker = new
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elif new.lower() == 'pickle':
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self.pack = pickle_packer
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self.unpack = pickle_unpacker
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self.unpacker = new
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else:
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self.pack = import_item(str(new))
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unpacker = DottedObjectName('json', config=True,
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help="""The name of the unpacker for unserializing messages.
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Only used with custom functions for `packer`.""")
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@observe('unpacker')
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def _unpacker_changed(self, change):
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new = change['new']
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if new.lower() == 'json':
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self.pack = json_packer
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self.unpack = json_unpacker
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self.packer = new
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elif new.lower() == 'pickle':
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self.pack = pickle_packer
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self.unpack = pickle_unpacker
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self.packer = new
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else:
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self.unpack = import_item(str(new))
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session = CUnicode(u'', config=True,
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help="""The UUID identifying this session.""")
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def _session_default(self):
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u = new_id()
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self.bsession = u.encode('ascii')
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return u
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@observe('session')
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def _session_changed(self, change):
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self.bsession = self.session.encode('ascii')
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# bsession is the session as bytes
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bsession = CBytes(b'')
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username = Unicode(str_to_unicode(os.environ.get('USER', 'username')),
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help="""Username for the Session. Default is your system username.""",
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config=True)
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metadata = Dict({}, config=True,
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help="""Metadata dictionary, which serves as the default top-level metadata dict for each message.""")
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# if 0, no adapting to do.
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adapt_version = Integer(0)
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# message signature related traits:
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key = CBytes(config=True,
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help="""execution key, for signing messages.""")
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||
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def _key_default(self):
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return new_id_bytes()
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@observe('key')
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def _key_changed(self, change):
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self._new_auth()
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signature_scheme = Unicode('hmac-sha256', config=True,
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help="""The digest scheme used to construct the message signatures.
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Must have the form 'hmac-HASH'.""")
|
||
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@observe('signature_scheme')
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def _signature_scheme_changed(self, change):
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new = change['new']
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if not new.startswith('hmac-'):
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raise TraitError("signature_scheme must start with 'hmac-', got %r" % new)
|
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hash_name = new.split('-', 1)[1]
|
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try:
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self.digest_mod = getattr(hashlib, hash_name)
|
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except AttributeError:
|
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raise TraitError("hashlib has no such attribute: %s" % hash_name)
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self._new_auth()
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digest_mod = Any()
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def _digest_mod_default(self):
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return hashlib.sha256
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auth = Instance(hmac.HMAC, allow_none=True)
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def _new_auth(self):
|
||
|
|
if self.key:
|
||
|
|
self.auth = hmac.HMAC(self.key, digestmod=self.digest_mod)
|
||
|
|
else:
|
||
|
|
self.auth = None
|
||
|
|
|
||
|
|
digest_history = Set()
|
||
|
|
digest_history_size = Integer(2**16, config=True,
|
||
|
|
help="""The maximum number of digests to remember.
|
||
|
|
|
||
|
|
The digest history will be culled when it exceeds this value.
|
||
|
|
"""
|
||
|
|
)
|
||
|
|
|
||
|
|
keyfile = Unicode('', config=True,
|
||
|
|
help="""path to file containing execution key.""")
|
||
|
|
|
||
|
|
@observe('keyfile')
|
||
|
|
def _keyfile_changed(self, change):
|
||
|
|
with open(change['new'], 'rb') as f:
|
||
|
|
self.key = f.read().strip()
|
||
|
|
|
||
|
|
# for protecting against sends from forks
|
||
|
|
pid = Integer()
|
||
|
|
|
||
|
|
# serialization traits:
|
||
|
|
|
||
|
|
pack = Any(default_packer) # the actual packer function
|
||
|
|
|
||
|
|
@observe('pack')
|
||
|
|
def _pack_changed(self, change):
|
||
|
|
new = change['new']
|
||
|
|
if not callable(new):
|
||
|
|
raise TypeError("packer must be callable, not %s"%type(new))
|
||
|
|
|
||
|
|
unpack = Any(default_unpacker) # the actual packer function
|
||
|
|
|
||
|
|
@observe('unpack')
|
||
|
|
def _unpack_changed(self, change):
|
||
|
|
# unpacker is not checked - it is assumed to be
|
||
|
|
new = change['new']
|
||
|
|
if not callable(new):
|
||
|
|
raise TypeError("unpacker must be callable, not %s"%type(new))
|
||
|
|
|
||
|
|
# thresholds:
|
||
|
|
copy_threshold = Integer(2**16, config=True,
|
||
|
|
help="Threshold (in bytes) beyond which a buffer should be sent without copying.")
|
||
|
|
buffer_threshold = Integer(MAX_BYTES, config=True,
|
||
|
|
help="Threshold (in bytes) beyond which an object's buffer should be extracted to avoid pickling.")
|
||
|
|
item_threshold = Integer(MAX_ITEMS, config=True,
|
||
|
|
help="""The maximum number of items for a container to be introspected for custom serialization.
|
||
|
|
Containers larger than this are pickled outright.
|
||
|
|
"""
|
||
|
|
)
|
||
|
|
|
||
|
|
|
||
|
|
def __init__(self, **kwargs):
|
||
|
|
"""create a Session object
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
|
||
|
|
debug : bool
|
||
|
|
whether to trigger extra debugging statements
|
||
|
|
packer/unpacker : str : 'json', 'pickle' or import_string
|
||
|
|
importstrings for methods to serialize message parts. If just
|
||
|
|
'json' or 'pickle', predefined JSON and pickle packers will be used.
|
||
|
|
Otherwise, the entire importstring must be used.
|
||
|
|
|
||
|
|
The functions must accept at least valid JSON input, and output
|
||
|
|
*bytes*.
|
||
|
|
|
||
|
|
For example, to use msgpack:
|
||
|
|
packer = 'msgpack.packb', unpacker='msgpack.unpackb'
|
||
|
|
pack/unpack : callables
|
||
|
|
You can also set the pack/unpack callables for serialization
|
||
|
|
directly.
|
||
|
|
session : unicode (must be ascii)
|
||
|
|
the ID of this Session object. The default is to generate a new
|
||
|
|
UUID.
|
||
|
|
bsession : bytes
|
||
|
|
The session as bytes
|
||
|
|
username : unicode
|
||
|
|
username added to message headers. The default is to ask the OS.
|
||
|
|
key : bytes
|
||
|
|
The key used to initialize an HMAC signature. If unset, messages
|
||
|
|
will not be signed or checked.
|
||
|
|
signature_scheme : str
|
||
|
|
The message digest scheme. Currently must be of the form 'hmac-HASH',
|
||
|
|
where 'HASH' is a hashing function available in Python's hashlib.
|
||
|
|
The default is 'hmac-sha256'.
|
||
|
|
This is ignored if 'key' is empty.
|
||
|
|
keyfile : filepath
|
||
|
|
The file containing a key. If this is set, `key` will be
|
||
|
|
initialized to the contents of the file.
|
||
|
|
"""
|
||
|
|
super(Session, self).__init__(**kwargs)
|
||
|
|
self._check_packers()
|
||
|
|
self.none = self.pack({})
|
||
|
|
# ensure self._session_default() if necessary, so bsession is defined:
|
||
|
|
self.session
|
||
|
|
self.pid = os.getpid()
|
||
|
|
self._new_auth()
|
||
|
|
if not self.key:
|
||
|
|
get_logger().warning("Message signing is disabled. This is insecure and not recommended!")
|
||
|
|
|
||
|
|
def clone(self):
|
||
|
|
"""Create a copy of this Session
|
||
|
|
|
||
|
|
Useful when connecting multiple times to a given kernel.
|
||
|
|
This prevents a shared digest_history warning about duplicate digests
|
||
|
|
due to multiple connections to IOPub in the same process.
|
||
|
|
|
||
|
|
.. versionadded:: 5.1
|
||
|
|
"""
|
||
|
|
# make a copy
|
||
|
|
new_session = type(self)()
|
||
|
|
for name in self.traits():
|
||
|
|
setattr(new_session, name, getattr(self, name))
|
||
|
|
# fork digest_history
|
||
|
|
new_session.digest_history = set()
|
||
|
|
new_session.digest_history.update(self.digest_history)
|
||
|
|
return new_session
|
||
|
|
|
||
|
|
message_count = 0
|
||
|
|
@property
|
||
|
|
def msg_id(self):
|
||
|
|
message_number = self.message_count
|
||
|
|
self.message_count += 1
|
||
|
|
return '{}_{}'.format(self.session, message_number)
|
||
|
|
|
||
|
|
def _check_packers(self):
|
||
|
|
"""check packers for datetime support."""
|
||
|
|
pack = self.pack
|
||
|
|
unpack = self.unpack
|
||
|
|
|
||
|
|
# check simple serialization
|
||
|
|
msg = dict(a=[1,'hi'])
|
||
|
|
try:
|
||
|
|
packed = pack(msg)
|
||
|
|
except Exception as e:
|
||
|
|
msg = "packer '{packer}' could not serialize a simple message: {e}{jsonmsg}"
|
||
|
|
if self.packer == 'json':
|
||
|
|
jsonmsg = "\nzmq.utils.jsonapi.jsonmod = %s" % jsonapi.jsonmod
|
||
|
|
else:
|
||
|
|
jsonmsg = ""
|
||
|
|
raise ValueError(
|
||
|
|
msg.format(packer=self.packer, e=e, jsonmsg=jsonmsg)
|
||
|
|
)
|
||
|
|
|
||
|
|
# ensure packed message is bytes
|
||
|
|
if not isinstance(packed, bytes):
|
||
|
|
raise ValueError("message packed to %r, but bytes are required"%type(packed))
|
||
|
|
|
||
|
|
# check that unpack is pack's inverse
|
||
|
|
try:
|
||
|
|
unpacked = unpack(packed)
|
||
|
|
assert unpacked == msg
|
||
|
|
except Exception as e:
|
||
|
|
msg = "unpacker '{unpacker}' could not handle output from packer '{packer}': {e}{jsonmsg}"
|
||
|
|
if self.packer == 'json':
|
||
|
|
jsonmsg = "\nzmq.utils.jsonapi.jsonmod = %s" % jsonapi.jsonmod
|
||
|
|
else:
|
||
|
|
jsonmsg = ""
|
||
|
|
raise ValueError(
|
||
|
|
msg.format(packer=self.packer, unpacker=self.unpacker, e=e, jsonmsg=jsonmsg)
|
||
|
|
)
|
||
|
|
|
||
|
|
# check datetime support
|
||
|
|
msg = dict(t=utcnow())
|
||
|
|
try:
|
||
|
|
unpacked = unpack(pack(msg))
|
||
|
|
if isinstance(unpacked['t'], datetime):
|
||
|
|
raise ValueError("Shouldn't deserialize to datetime")
|
||
|
|
except Exception:
|
||
|
|
self.pack = lambda o: pack(squash_dates(o))
|
||
|
|
self.unpack = lambda s: unpack(s)
|
||
|
|
|
||
|
|
def msg_header(self, msg_type):
|
||
|
|
return msg_header(self.msg_id, msg_type, self.username, self.session)
|
||
|
|
|
||
|
|
def msg(self, msg_type, content=None, parent=None, header=None, metadata=None):
|
||
|
|
"""Return the nested message dict.
|
||
|
|
|
||
|
|
This format is different from what is sent over the wire. The
|
||
|
|
serialize/deserialize methods converts this nested message dict to the wire
|
||
|
|
format, which is a list of message parts.
|
||
|
|
"""
|
||
|
|
msg = {}
|
||
|
|
header = self.msg_header(msg_type) if header is None else header
|
||
|
|
msg['header'] = header
|
||
|
|
msg['msg_id'] = header['msg_id']
|
||
|
|
msg['msg_type'] = header['msg_type']
|
||
|
|
msg['parent_header'] = {} if parent is None else extract_header(parent)
|
||
|
|
msg['content'] = {} if content is None else content
|
||
|
|
msg['metadata'] = self.metadata.copy()
|
||
|
|
if metadata is not None:
|
||
|
|
msg['metadata'].update(metadata)
|
||
|
|
return msg
|
||
|
|
|
||
|
|
def sign(self, msg_list):
|
||
|
|
"""Sign a message with HMAC digest. If no auth, return b''.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
msg_list : list
|
||
|
|
The [p_header,p_parent,p_content] part of the message list.
|
||
|
|
"""
|
||
|
|
if self.auth is None:
|
||
|
|
return b''
|
||
|
|
h = self.auth.copy()
|
||
|
|
for m in msg_list:
|
||
|
|
h.update(m)
|
||
|
|
return str_to_bytes(h.hexdigest())
|
||
|
|
|
||
|
|
def serialize(self, msg, ident=None):
|
||
|
|
"""Serialize the message components to bytes.
|
||
|
|
|
||
|
|
This is roughly the inverse of deserialize. The serialize/deserialize
|
||
|
|
methods work with full message lists, whereas pack/unpack work with
|
||
|
|
the individual message parts in the message list.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
msg : dict or Message
|
||
|
|
The next message dict as returned by the self.msg method.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
msg_list : list
|
||
|
|
The list of bytes objects to be sent with the format::
|
||
|
|
|
||
|
|
[ident1, ident2, ..., DELIM, HMAC, p_header, p_parent,
|
||
|
|
p_metadata, p_content, buffer1, buffer2, ...]
|
||
|
|
|
||
|
|
In this list, the ``p_*`` entities are the packed or serialized
|
||
|
|
versions, so if JSON is used, these are utf8 encoded JSON strings.
|
||
|
|
"""
|
||
|
|
content = msg.get('content', {})
|
||
|
|
if content is None:
|
||
|
|
content = self.none
|
||
|
|
elif isinstance(content, dict):
|
||
|
|
content = self.pack(content)
|
||
|
|
elif isinstance(content, bytes):
|
||
|
|
# content is already packed, as in a relayed message
|
||
|
|
pass
|
||
|
|
elif isinstance(content, unicode_type):
|
||
|
|
# should be bytes, but JSON often spits out unicode
|
||
|
|
content = content.encode('utf8')
|
||
|
|
else:
|
||
|
|
raise TypeError("Content incorrect type: %s"%type(content))
|
||
|
|
|
||
|
|
real_message = [self.pack(msg['header']),
|
||
|
|
self.pack(msg['parent_header']),
|
||
|
|
self.pack(msg['metadata']),
|
||
|
|
content,
|
||
|
|
]
|
||
|
|
|
||
|
|
to_send = []
|
||
|
|
|
||
|
|
if isinstance(ident, list):
|
||
|
|
# accept list of idents
|
||
|
|
to_send.extend(ident)
|
||
|
|
elif ident is not None:
|
||
|
|
to_send.append(ident)
|
||
|
|
to_send.append(DELIM)
|
||
|
|
|
||
|
|
signature = self.sign(real_message)
|
||
|
|
to_send.append(signature)
|
||
|
|
|
||
|
|
to_send.extend(real_message)
|
||
|
|
|
||
|
|
return to_send
|
||
|
|
|
||
|
|
def send(self, stream, msg_or_type, content=None, parent=None, ident=None,
|
||
|
|
buffers=None, track=False, header=None, metadata=None):
|
||
|
|
"""Build and send a message via stream or socket.
|
||
|
|
|
||
|
|
The message format used by this function internally is as follows:
|
||
|
|
|
||
|
|
[ident1,ident2,...,DELIM,HMAC,p_header,p_parent,p_content,
|
||
|
|
buffer1,buffer2,...]
|
||
|
|
|
||
|
|
The serialize/deserialize methods convert the nested message dict into this
|
||
|
|
format.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
|
||
|
|
stream : zmq.Socket or ZMQStream
|
||
|
|
The socket-like object used to send the data.
|
||
|
|
msg_or_type : str or Message/dict
|
||
|
|
Normally, msg_or_type will be a msg_type unless a message is being
|
||
|
|
sent more than once. If a header is supplied, this can be set to
|
||
|
|
None and the msg_type will be pulled from the header.
|
||
|
|
|
||
|
|
content : dict or None
|
||
|
|
The content of the message (ignored if msg_or_type is a message).
|
||
|
|
header : dict or None
|
||
|
|
The header dict for the message (ignored if msg_to_type is a message).
|
||
|
|
parent : Message or dict or None
|
||
|
|
The parent or parent header describing the parent of this message
|
||
|
|
(ignored if msg_or_type is a message).
|
||
|
|
ident : bytes or list of bytes
|
||
|
|
The zmq.IDENTITY routing path.
|
||
|
|
metadata : dict or None
|
||
|
|
The metadata describing the message
|
||
|
|
buffers : list or None
|
||
|
|
The already-serialized buffers to be appended to the message.
|
||
|
|
track : bool
|
||
|
|
Whether to track. Only for use with Sockets, because ZMQStream
|
||
|
|
objects cannot track messages.
|
||
|
|
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
msg : dict
|
||
|
|
The constructed message.
|
||
|
|
"""
|
||
|
|
if not isinstance(stream, zmq.Socket):
|
||
|
|
# ZMQStreams and dummy sockets do not support tracking.
|
||
|
|
track = False
|
||
|
|
|
||
|
|
if isinstance(msg_or_type, (Message, dict)):
|
||
|
|
# We got a Message or message dict, not a msg_type so don't
|
||
|
|
# build a new Message.
|
||
|
|
msg = msg_or_type
|
||
|
|
buffers = buffers or msg.get('buffers', [])
|
||
|
|
else:
|
||
|
|
msg = self.msg(msg_or_type, content=content, parent=parent,
|
||
|
|
header=header, metadata=metadata)
|
||
|
|
if self.check_pid and not os.getpid() == self.pid:
|
||
|
|
get_logger().warning("WARNING: attempted to send message from fork\n%s",
|
||
|
|
msg
|
||
|
|
)
|
||
|
|
return
|
||
|
|
buffers = [] if buffers is None else buffers
|
||
|
|
for idx, buf in enumerate(buffers):
|
||
|
|
if isinstance(buf, memoryview):
|
||
|
|
view = buf
|
||
|
|
else:
|
||
|
|
try:
|
||
|
|
# check to see if buf supports the buffer protocol.
|
||
|
|
view = memoryview(buf)
|
||
|
|
except TypeError:
|
||
|
|
raise TypeError("Buffer objects must support the buffer protocol.")
|
||
|
|
# memoryview.contiguous is new in 3.3,
|
||
|
|
# just skip the check on Python 2
|
||
|
|
if hasattr(view, 'contiguous') and not view.contiguous:
|
||
|
|
# zmq requires memoryviews to be contiguous
|
||
|
|
raise ValueError("Buffer %i (%r) is not contiguous" % (idx, buf))
|
||
|
|
|
||
|
|
if self.adapt_version:
|
||
|
|
msg = adapt(msg, self.adapt_version)
|
||
|
|
to_send = self.serialize(msg, ident)
|
||
|
|
to_send.extend(buffers)
|
||
|
|
longest = max([ len(s) for s in to_send ])
|
||
|
|
copy = (longest < self.copy_threshold)
|
||
|
|
|
||
|
|
if buffers and track and not copy:
|
||
|
|
# only really track when we are doing zero-copy buffers
|
||
|
|
tracker = stream.send_multipart(to_send, copy=False, track=True)
|
||
|
|
else:
|
||
|
|
# use dummy tracker, which will be done immediately
|
||
|
|
tracker = DONE
|
||
|
|
stream.send_multipart(to_send, copy=copy)
|
||
|
|
|
||
|
|
if self.debug:
|
||
|
|
pprint.pprint(msg)
|
||
|
|
pprint.pprint(to_send)
|
||
|
|
pprint.pprint(buffers)
|
||
|
|
|
||
|
|
msg['tracker'] = tracker
|
||
|
|
|
||
|
|
return msg
|
||
|
|
|
||
|
|
def send_raw(self, stream, msg_list, flags=0, copy=True, ident=None):
|
||
|
|
"""Send a raw message via ident path.
|
||
|
|
|
||
|
|
This method is used to send a already serialized message.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
stream : ZMQStream or Socket
|
||
|
|
The ZMQ stream or socket to use for sending the message.
|
||
|
|
msg_list : list
|
||
|
|
The serialized list of messages to send. This only includes the
|
||
|
|
[p_header,p_parent,p_metadata,p_content,buffer1,buffer2,...] portion of
|
||
|
|
the message.
|
||
|
|
ident : ident or list
|
||
|
|
A single ident or a list of idents to use in sending.
|
||
|
|
"""
|
||
|
|
to_send = []
|
||
|
|
if isinstance(ident, bytes):
|
||
|
|
ident = [ident]
|
||
|
|
if ident is not None:
|
||
|
|
to_send.extend(ident)
|
||
|
|
|
||
|
|
to_send.append(DELIM)
|
||
|
|
# Don't include buffers in signature (per spec).
|
||
|
|
to_send.append(self.sign(msg_list[0:4]))
|
||
|
|
to_send.extend(msg_list)
|
||
|
|
stream.send_multipart(to_send, flags, copy=copy)
|
||
|
|
|
||
|
|
def recv(self, socket, mode=zmq.NOBLOCK, content=True, copy=True):
|
||
|
|
"""Receive and unpack a message.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
socket : ZMQStream or Socket
|
||
|
|
The socket or stream to use in receiving.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
[idents], msg
|
||
|
|
[idents] is a list of idents and msg is a nested message dict of
|
||
|
|
same format as self.msg returns.
|
||
|
|
"""
|
||
|
|
if isinstance(socket, ZMQStream):
|
||
|
|
socket = socket.socket
|
||
|
|
try:
|
||
|
|
msg_list = socket.recv_multipart(mode, copy=copy)
|
||
|
|
except zmq.ZMQError as e:
|
||
|
|
if e.errno == zmq.EAGAIN:
|
||
|
|
# We can convert EAGAIN to None as we know in this case
|
||
|
|
# recv_multipart won't return None.
|
||
|
|
return None,None
|
||
|
|
else:
|
||
|
|
raise
|
||
|
|
# split multipart message into identity list and message dict
|
||
|
|
# invalid large messages can cause very expensive string comparisons
|
||
|
|
idents, msg_list = self.feed_identities(msg_list, copy)
|
||
|
|
try:
|
||
|
|
return idents, self.deserialize(msg_list, content=content, copy=copy)
|
||
|
|
except Exception as e:
|
||
|
|
# TODO: handle it
|
||
|
|
raise e
|
||
|
|
|
||
|
|
def feed_identities(self, msg_list, copy=True):
|
||
|
|
"""Split the identities from the rest of the message.
|
||
|
|
|
||
|
|
Feed until DELIM is reached, then return the prefix as idents and
|
||
|
|
remainder as msg_list. This is easily broken by setting an IDENT to DELIM,
|
||
|
|
but that would be silly.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
msg_list : a list of Message or bytes objects
|
||
|
|
The message to be split.
|
||
|
|
copy : bool
|
||
|
|
flag determining whether the arguments are bytes or Messages
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
(idents, msg_list) : two lists
|
||
|
|
idents will always be a list of bytes, each of which is a ZMQ
|
||
|
|
identity. msg_list will be a list of bytes or zmq.Messages of the
|
||
|
|
form [HMAC,p_header,p_parent,p_content,buffer1,buffer2,...] and
|
||
|
|
should be unpackable/unserializable via self.deserialize at this
|
||
|
|
point.
|
||
|
|
"""
|
||
|
|
if copy:
|
||
|
|
idx = msg_list.index(DELIM)
|
||
|
|
return msg_list[:idx], msg_list[idx+1:]
|
||
|
|
else:
|
||
|
|
failed = True
|
||
|
|
for idx,m in enumerate(msg_list):
|
||
|
|
if m.bytes == DELIM:
|
||
|
|
failed = False
|
||
|
|
break
|
||
|
|
if failed:
|
||
|
|
raise ValueError("DELIM not in msg_list")
|
||
|
|
idents, msg_list = msg_list[:idx], msg_list[idx+1:]
|
||
|
|
return [m.bytes for m in idents], msg_list
|
||
|
|
|
||
|
|
def _add_digest(self, signature):
|
||
|
|
"""add a digest to history to protect against replay attacks"""
|
||
|
|
if self.digest_history_size == 0:
|
||
|
|
# no history, never add digests
|
||
|
|
return
|
||
|
|
|
||
|
|
self.digest_history.add(signature)
|
||
|
|
if len(self.digest_history) > self.digest_history_size:
|
||
|
|
# threshold reached, cull 10%
|
||
|
|
self._cull_digest_history()
|
||
|
|
|
||
|
|
def _cull_digest_history(self):
|
||
|
|
"""cull the digest history
|
||
|
|
|
||
|
|
Removes a randomly selected 10% of the digest history
|
||
|
|
"""
|
||
|
|
current = len(self.digest_history)
|
||
|
|
n_to_cull = max(int(current // 10), current - self.digest_history_size)
|
||
|
|
if n_to_cull >= current:
|
||
|
|
self.digest_history = set()
|
||
|
|
return
|
||
|
|
to_cull = random.sample(self.digest_history, n_to_cull)
|
||
|
|
self.digest_history.difference_update(to_cull)
|
||
|
|
|
||
|
|
def deserialize(self, msg_list, content=True, copy=True):
|
||
|
|
"""Unserialize a msg_list to a nested message dict.
|
||
|
|
|
||
|
|
This is roughly the inverse of serialize. The serialize/deserialize
|
||
|
|
methods work with full message lists, whereas pack/unpack work with
|
||
|
|
the individual message parts in the message list.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
msg_list : list of bytes or Message objects
|
||
|
|
The list of message parts of the form [HMAC,p_header,p_parent,
|
||
|
|
p_metadata,p_content,buffer1,buffer2,...].
|
||
|
|
content : bool (True)
|
||
|
|
Whether to unpack the content dict (True), or leave it packed
|
||
|
|
(False).
|
||
|
|
copy : bool (True)
|
||
|
|
Whether msg_list contains bytes (True) or the non-copying Message
|
||
|
|
objects in each place (False).
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
msg : dict
|
||
|
|
The nested message dict with top-level keys [header, parent_header,
|
||
|
|
content, buffers]. The buffers are returned as memoryviews.
|
||
|
|
"""
|
||
|
|
minlen = 5
|
||
|
|
message = {}
|
||
|
|
if not copy:
|
||
|
|
# pyzmq didn't copy the first parts of the message, so we'll do it
|
||
|
|
for i in range(minlen):
|
||
|
|
msg_list[i] = msg_list[i].bytes
|
||
|
|
if self.auth is not None:
|
||
|
|
signature = msg_list[0]
|
||
|
|
if not signature:
|
||
|
|
raise ValueError("Unsigned Message")
|
||
|
|
if signature in self.digest_history:
|
||
|
|
raise ValueError("Duplicate Signature: %r" % signature)
|
||
|
|
if content:
|
||
|
|
# Only store signature if we are unpacking content, don't store if just peeking.
|
||
|
|
self._add_digest(signature)
|
||
|
|
check = self.sign(msg_list[1:5])
|
||
|
|
if not compare_digest(signature, check):
|
||
|
|
raise ValueError("Invalid Signature: %r" % signature)
|
||
|
|
if not len(msg_list) >= minlen:
|
||
|
|
raise TypeError("malformed message, must have at least %i elements"%minlen)
|
||
|
|
header = self.unpack(msg_list[1])
|
||
|
|
message['header'] = extract_dates(header)
|
||
|
|
message['msg_id'] = header['msg_id']
|
||
|
|
message['msg_type'] = header['msg_type']
|
||
|
|
message['parent_header'] = extract_dates(self.unpack(msg_list[2]))
|
||
|
|
message['metadata'] = self.unpack(msg_list[3])
|
||
|
|
if content:
|
||
|
|
message['content'] = self.unpack(msg_list[4])
|
||
|
|
else:
|
||
|
|
message['content'] = msg_list[4]
|
||
|
|
buffers = [memoryview(b) for b in msg_list[5:]]
|
||
|
|
if buffers and buffers[0].shape is None:
|
||
|
|
# force copy to workaround pyzmq #646
|
||
|
|
buffers = [memoryview(b.bytes) for b in msg_list[5:]]
|
||
|
|
message['buffers'] = buffers
|
||
|
|
if self.debug:
|
||
|
|
pprint.pprint(message)
|
||
|
|
# adapt to the current version
|
||
|
|
return adapt(message)
|
||
|
|
|
||
|
|
def unserialize(self, *args, **kwargs):
|
||
|
|
warnings.warn(
|
||
|
|
"Session.unserialize is deprecated. Use Session.deserialize.",
|
||
|
|
DeprecationWarning,
|
||
|
|
)
|
||
|
|
return self.deserialize(*args, **kwargs)
|
||
|
|
|
||
|
|
|
||
|
|
def test_msg2obj():
|
||
|
|
am = dict(x=1)
|
||
|
|
ao = Message(am)
|
||
|
|
assert ao.x == am['x']
|
||
|
|
|
||
|
|
am['y'] = dict(z=1)
|
||
|
|
ao = Message(am)
|
||
|
|
assert ao.y.z == am['y']['z']
|
||
|
|
|
||
|
|
k1, k2 = 'y', 'z'
|
||
|
|
assert ao[k1][k2] == am[k1][k2]
|
||
|
|
|
||
|
|
am2 = dict(ao)
|
||
|
|
assert am['x'] == am2['x']
|
||
|
|
assert am['y']['z'] == am2['y']['z']
|