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1090 lines
36 KiB
Python
1090 lines
36 KiB
Python
2 years ago
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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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import hashlib
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import hmac
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import json
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import logging
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import os
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import pickle
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import pprint
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import random
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import typing as t
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import warnings
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from binascii import b2a_hex
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from datetime import datetime
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from datetime import timezone
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from hmac import (
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compare_digest,
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) # We are using compare_digest to limit the surface of timing attacks
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from typing import Optional
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from typing import Union
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import zmq.asyncio
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from traitlets import Any
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from traitlets import Bool
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from traitlets import CBytes
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from traitlets import CUnicode
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from traitlets import Dict
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from traitlets import DottedObjectName
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from traitlets import Instance
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from traitlets import Integer
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from traitlets import observe
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from traitlets import Set
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from traitlets import TraitError
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from traitlets import Unicode
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from traitlets.config.configurable import Configurable
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from traitlets.config.configurable import LoggingConfigurable
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from traitlets.log import get_logger
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from traitlets.utils.importstring import import_item
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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 jupyter_client import protocol_version
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from jupyter_client.adapter import adapt
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from jupyter_client.jsonutil import extract_dates
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from jupyter_client.jsonutil import json_clean
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from jupyter_client.jsonutil import json_default
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from jupyter_client.jsonutil import squash_dates
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PICKLE_PROTOCOL = pickle.DEFAULT_PROTOCOL
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utc = timezone.utc
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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, str):
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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, str):
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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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def json_packer(obj):
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try:
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return json.dumps(
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obj,
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default=json_default,
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ensure_ascii=False,
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allow_nan=False,
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).encode("utf8", errors="surrogateescape")
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except (TypeError, ValueError) as e:
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# Fallback to trying to clean the json before serializing
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packed = json.dumps(
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json_clean(obj),
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default=json_default,
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ensure_ascii=False,
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allow_nan=False,
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).encode("utf8", errors="surrogateescape")
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warnings.warn(
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f"Message serialization failed with:\n{e}\n"
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"Supporting this message is deprecated in jupyter-client 7, please make "
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"sure your message is JSON-compliant",
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stacklevel=2,
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)
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return packed
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def json_unpacker(s):
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if isinstance(s, bytes):
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s = s.decode("utf8", "replace")
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return json.loads(s)
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def pickle_packer(o):
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return 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() -> str:
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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 "-".join(b2a_hex(x).decode("ascii") for x in (buf[:4], buf[4:]))
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def new_id_bytes() -> 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": (
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{"Session": {"key": new_id_bytes(), "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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),
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"no-secure": (
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{"Session": {"key": b"", "keyfile": ""}},
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"""Don't authenticate messages.""",
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),
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}
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def default_secure(cfg: t.Any) -> None:
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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() -> datetime:
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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") # type:ignore[misc]
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def _logname_changed(self, change: t.Any) -> None:
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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) -> zmq.Context:
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return zmq.Context()
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session = Instance("jupyter_client.session.Session", 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().__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: t.Dict[str, t.Any]) -> None:
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dct = self.__dict__
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for k, v in dict(msg_dict).items():
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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) -> t.ItemsView[str, t.Any]:
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return self.__dict__.items()
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def __repr__(self) -> str:
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return repr(self.__dict__)
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def __str__(self) -> str:
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return pprint.pformat(self.__dict__)
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def __contains__(self, k: object) -> bool:
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return k in self.__dict__
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def __getitem__(self, k: str) -> t.Any:
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return self.__dict__[k]
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def msg_header(msg_id: str, msg_type: str, username: str, session: "Session") -> t.Dict[str, t.Any]:
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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: t.Dict[str, t.Any]) -> t.Dict[str, t.Any]:
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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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----------
|
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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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||
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debug = Bool(False, config=True, help="""Debug output in the Session""")
|
||
|
|
|
||
|
|
check_pid = Bool(
|
||
|
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True,
|
||
|
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config=True,
|
||
|
|
help="""Whether to check PID to protect against calls after fork.
|
||
|
|
|
||
|
|
This check can be disabled if fork-safety is handled elsewhere.
|
||
|
|
""",
|
||
|
|
)
|
||
|
|
|
||
|
|
packer = DottedObjectName(
|
||
|
|
"json",
|
||
|
|
config=True,
|
||
|
|
help="""The name of the packer for serializing messages.
|
||
|
|
Should be one of 'json', 'pickle', or an import name
|
||
|
|
for a custom callable serializer.""",
|
||
|
|
)
|
||
|
|
|
||
|
|
@observe("packer")
|
||
|
|
def _packer_changed(self, change):
|
||
|
|
new = change["new"]
|
||
|
|
if new.lower() == "json":
|
||
|
|
self.pack = json_packer
|
||
|
|
self.unpack = json_unpacker
|
||
|
|
self.unpacker = new
|
||
|
|
elif new.lower() == "pickle":
|
||
|
|
self.pack = pickle_packer
|
||
|
|
self.unpack = pickle_unpacker
|
||
|
|
self.unpacker = new
|
||
|
|
else:
|
||
|
|
self.pack = import_item(str(new))
|
||
|
|
|
||
|
|
unpacker = DottedObjectName(
|
||
|
|
"json",
|
||
|
|
config=True,
|
||
|
|
help="""The name of the unpacker for unserializing messages.
|
||
|
|
Only used with custom functions for `packer`.""",
|
||
|
|
)
|
||
|
|
|
||
|
|
@observe("unpacker")
|
||
|
|
def _unpacker_changed(self, change):
|
||
|
|
new = change["new"]
|
||
|
|
if new.lower() == "json":
|
||
|
|
self.pack = json_packer
|
||
|
|
self.unpack = json_unpacker
|
||
|
|
self.packer = new
|
||
|
|
elif new.lower() == "pickle":
|
||
|
|
self.pack = pickle_packer
|
||
|
|
self.unpack = pickle_unpacker
|
||
|
|
self.packer = new
|
||
|
|
else:
|
||
|
|
self.unpack = import_item(str(new))
|
||
|
|
|
||
|
|
session = CUnicode("", config=True, help="""The UUID identifying this session.""")
|
||
|
|
|
||
|
|
def _session_default(self) -> str:
|
||
|
|
u = new_id()
|
||
|
|
self.bsession = u.encode("ascii")
|
||
|
|
return u
|
||
|
|
|
||
|
|
@observe("session")
|
||
|
|
def _session_changed(self, change):
|
||
|
|
self.bsession = self.session.encode("ascii")
|
||
|
|
|
||
|
|
# bsession is the session as bytes
|
||
|
|
bsession = CBytes(b"")
|
||
|
|
|
||
|
|
username = Unicode(
|
||
|
|
os.environ.get("USER", "username"),
|
||
|
|
help="""Username for the Session. Default is your system username.""",
|
||
|
|
config=True,
|
||
|
|
)
|
||
|
|
|
||
|
|
metadata = Dict(
|
||
|
|
{},
|
||
|
|
config=True,
|
||
|
|
help="Metadata dictionary, which serves as the default top-level metadata dict for each "
|
||
|
|
"message.",
|
||
|
|
)
|
||
|
|
|
||
|
|
# if 0, no adapting to do.
|
||
|
|
adapt_version = Integer(0)
|
||
|
|
|
||
|
|
# message signature related traits:
|
||
|
|
|
||
|
|
key = CBytes(config=True, help="""execution key, for signing messages.""")
|
||
|
|
|
||
|
|
def _key_default(self) -> bytes:
|
||
|
|
return new_id_bytes()
|
||
|
|
|
||
|
|
@observe("key")
|
||
|
|
def _key_changed(self, change):
|
||
|
|
self._new_auth()
|
||
|
|
|
||
|
|
signature_scheme = Unicode(
|
||
|
|
"hmac-sha256",
|
||
|
|
config=True,
|
||
|
|
help="""The digest scheme used to construct the message signatures.
|
||
|
|
Must have the form 'hmac-HASH'.""",
|
||
|
|
)
|
||
|
|
|
||
|
|
@observe("signature_scheme")
|
||
|
|
def _signature_scheme_changed(self, change):
|
||
|
|
new = change["new"]
|
||
|
|
if not new.startswith("hmac-"):
|
||
|
|
raise TraitError("signature_scheme must start with 'hmac-', got %r" % new)
|
||
|
|
hash_name = new.split("-", 1)[1]
|
||
|
|
try:
|
||
|
|
self.digest_mod = getattr(hashlib, hash_name)
|
||
|
|
except AttributeError as e:
|
||
|
|
raise TraitError("hashlib has no such attribute: %s" % hash_name) from e
|
||
|
|
self._new_auth()
|
||
|
|
|
||
|
|
digest_mod = Any()
|
||
|
|
|
||
|
|
def _digest_mod_default(self) -> t.Callable:
|
||
|
|
return hashlib.sha256
|
||
|
|
|
||
|
|
auth = Instance(hmac.HMAC, allow_none=True)
|
||
|
|
|
||
|
|
def _new_auth(self) -> None:
|
||
|
|
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().__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) -> "Session":
|
||
|
|
"""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) -> str:
|
||
|
|
message_number = self.message_count
|
||
|
|
self.message_count += 1
|
||
|
|
return f"{self.session}_{os.getpid()}_{message_number}"
|
||
|
|
|
||
|
|
def _check_packers(self) -> None:
|
||
|
|
"""check packers for datetime support."""
|
||
|
|
pack = self.pack
|
||
|
|
unpack = self.unpack
|
||
|
|
|
||
|
|
# check simple serialization
|
||
|
|
msg_list = dict(a=[1, "hi"])
|
||
|
|
try:
|
||
|
|
packed = pack(msg_list)
|
||
|
|
except Exception as e:
|
||
|
|
raise ValueError(
|
||
|
|
f"packer '{self.packer}' could not serialize a simple message: {e}"
|
||
|
|
) from e
|
||
|
|
|
||
|
|
# 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_list
|
||
|
|
except Exception as e:
|
||
|
|
raise ValueError(
|
||
|
|
f"unpacker '{self.unpacker}' could not handle output from packer"
|
||
|
|
f" '{self.packer}': {e}"
|
||
|
|
) from e
|
||
|
|
|
||
|
|
# check datetime support
|
||
|
|
msg_datetime = dict(t=utcnow())
|
||
|
|
try:
|
||
|
|
unpacked = unpack(pack(msg_datetime))
|
||
|
|
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: str) -> t.Dict[str, t.Any]:
|
||
|
|
return msg_header(self.msg_id, msg_type, self.username, self.session)
|
||
|
|
|
||
|
|
def msg(
|
||
|
|
self,
|
||
|
|
msg_type: str,
|
||
|
|
content: t.Optional[t.Dict] = None,
|
||
|
|
parent: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
header: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
metadata: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
) -> t.Dict[str, t.Any]:
|
||
|
|
"""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: t.List) -> bytes:
|
||
|
|
"""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 h.hexdigest().encode()
|
||
|
|
|
||
|
|
def serialize(
|
||
|
|
self,
|
||
|
|
msg: t.Dict[str, t.Any],
|
||
|
|
ident: t.Optional[t.Union[t.List[bytes], bytes]] = None,
|
||
|
|
) -> t.List[bytes]:
|
||
|
|
"""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, str):
|
||
|
|
# 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: Optional[Union[zmq.sugar.socket.Socket, ZMQStream]],
|
||
|
|
msg_or_type: t.Union[t.Dict[str, t.Any], str],
|
||
|
|
content: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
parent: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
ident: t.Optional[t.Union[bytes, t.List[bytes]]] = None,
|
||
|
|
buffers: t.Optional[t.List[bytes]] = None,
|
||
|
|
track: bool = False,
|
||
|
|
header: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
metadata: t.Optional[t.Dict[str, t.Any]] = None,
|
||
|
|
) -> t.Optional[t.Dict[str, t.Any]]:
|
||
|
|
"""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(stream, zmq.asyncio.Socket):
|
||
|
|
assert stream is not None
|
||
|
|
stream = zmq.Socket.shadow(stream.underlying)
|
||
|
|
|
||
|
|
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 None
|
||
|
|
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 as e:
|
||
|
|
raise TypeError("Buffer objects must support the buffer protocol.") from e
|
||
|
|
# 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 stream and 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)
|
||
|
|
elif stream:
|
||
|
|
# 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: zmq.sugar.socket.Socket,
|
||
|
|
msg_list: t.List,
|
||
|
|
flags: int = 0,
|
||
|
|
copy: bool = True,
|
||
|
|
ident: t.Optional[t.Union[bytes, t.List[bytes]]] = None,
|
||
|
|
) -> 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: zmq.sugar.socket.Socket,
|
||
|
|
mode: int = zmq.NOBLOCK,
|
||
|
|
content: bool = True,
|
||
|
|
copy: bool = True,
|
||
|
|
) -> t.Tuple[t.Optional[t.List[bytes]], t.Optional[t.Dict[str, t.Any]]]:
|
||
|
|
"""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: t.Union[t.List[bytes], t.List[zmq.Message]], copy: bool = True
|
||
|
|
) -> t.Tuple[t.List[bytes], t.Union[t.List[bytes], t.List[zmq.Message]]]:
|
||
|
|
"""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:
|
||
|
|
msg_list = t.cast(t.List[bytes], msg_list)
|
||
|
|
idx = msg_list.index(DELIM)
|
||
|
|
return msg_list[:idx], msg_list[idx + 1 :] # noqa
|
||
|
|
else:
|
||
|
|
msg_list = t.cast(t.List[zmq.Message], msg_list)
|
||
|
|
failed = True
|
||
|
|
for idx, m in enumerate(msg_list): # noqa
|
||
|
|
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 :] # noqa
|
||
|
|
return [bytes(m.bytes) for m in idents], msg_list
|
||
|
|
|
||
|
|
def _add_digest(self, signature: bytes) -> None:
|
||
|
|
"""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) -> None:
|
||
|
|
"""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(tuple(sorted(self.digest_history)), n_to_cull)
|
||
|
|
self.digest_history.difference_update(to_cull)
|
||
|
|
|
||
|
|
def deserialize(
|
||
|
|
self,
|
||
|
|
msg_list: t.Union[t.List[bytes], t.List[zmq.Message]],
|
||
|
|
content: bool = True,
|
||
|
|
copy: bool = True,
|
||
|
|
) -> t.Dict[str, t.Any]:
|
||
|
|
"""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
|
||
|
|
msg_list = t.cast(t.List[zmq.Message], msg_list)
|
||
|
|
msg_list_beginning = [bytes(msg.bytes) for msg in msg_list[:minlen]]
|
||
|
|
msg_list = t.cast(t.List[bytes], msg_list)
|
||
|
|
msg_list = msg_list_beginning + msg_list[minlen:]
|
||
|
|
msg_list = t.cast(t.List[bytes], msg_list)
|
||
|
|
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
|
||
|
|
msg_list = t.cast(t.List[zmq.Message], msg_list)
|
||
|
|
buffers = [memoryview(bytes(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: t.Any, **kwargs: t.Any) -> t.Dict[str, t.Any]:
|
||
|
|
warnings.warn(
|
||
|
|
"Session.unserialize is deprecated. Use Session.deserialize.",
|
||
|
|
DeprecationWarning,
|
||
|
|
)
|
||
|
|
return self.deserialize(*args, **kwargs)
|