/usr/lib/python2.7/dist-packages/autobahn/wamp/serializer.py is in python-autobahn 0.10.3+dfsg1-5.
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#
# The MIT License (MIT)
#
# Copyright (c) Tavendo GmbH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
###############################################################################
from __future__ import absolute_import
import six
import struct
from autobahn.wamp.interfaces import IObjectSerializer, ISerializer
from autobahn.wamp.exception import ProtocolError
from autobahn.wamp import message
# note: __all__ must be a list here, since we dynamically
# extend it depending on availability of more serializers
__all__ = ['Serializer',
'JsonObjectSerializer',
'JsonSerializer']
class Serializer(object):
"""
Base class for WAMP serializers. A WAMP serializer is the core glue between
parsed WAMP message objects and the bytes on wire (the transport).
"""
MESSAGE_TYPE_MAP = {
message.Hello.MESSAGE_TYPE: message.Hello,
message.Welcome.MESSAGE_TYPE: message.Welcome,
message.Abort.MESSAGE_TYPE: message.Abort,
message.Challenge.MESSAGE_TYPE: message.Challenge,
message.Authenticate.MESSAGE_TYPE: message.Authenticate,
message.Goodbye.MESSAGE_TYPE: message.Goodbye,
message.Error.MESSAGE_TYPE: message.Error,
message.Publish.MESSAGE_TYPE: message.Publish,
message.Published.MESSAGE_TYPE: message.Published,
message.Subscribe.MESSAGE_TYPE: message.Subscribe,
message.Subscribed.MESSAGE_TYPE: message.Subscribed,
message.Unsubscribe.MESSAGE_TYPE: message.Unsubscribe,
message.Unsubscribed.MESSAGE_TYPE: message.Unsubscribed,
message.Event.MESSAGE_TYPE: message.Event,
message.Call.MESSAGE_TYPE: message.Call,
message.Cancel.MESSAGE_TYPE: message.Cancel,
message.Result.MESSAGE_TYPE: message.Result,
message.Register.MESSAGE_TYPE: message.Register,
message.Registered.MESSAGE_TYPE: message.Registered,
message.Unregister.MESSAGE_TYPE: message.Unregister,
message.Unregistered.MESSAGE_TYPE: message.Unregistered,
message.Invocation.MESSAGE_TYPE: message.Invocation,
message.Interrupt.MESSAGE_TYPE: message.Interrupt,
message.Yield.MESSAGE_TYPE: message.Yield
}
"""
Mapping of WAMP message type codes to WAMP message classes.
"""
def __init__(self, serializer):
"""
Constructor.
:param serializer: The object serializer to use for WAMP wire-level serialization.
:type serializer: An object that implements :class:`autobahn.interfaces.IObjectSerializer`.
"""
self._serializer = serializer
def serialize(self, msg):
"""
Implements :func:`autobahn.wamp.interfaces.ISerializer.serialize`
"""
return msg.serialize(self._serializer), self._serializer.BINARY
def unserialize(self, payload, isBinary=None):
"""
Implements :func:`autobahn.wamp.interfaces.ISerializer.unserialize`
"""
if isBinary is not None:
if isBinary != self._serializer.BINARY:
raise ProtocolError("invalid serialization of WAMP message (binary {0}, but expected {1})".format(isBinary, self._serializer.BINARY))
try:
raw_msgs = self._serializer.unserialize(payload)
except Exception as e:
raise ProtocolError("invalid serialization of WAMP message ({0})".format(e))
msgs = []
for raw_msg in raw_msgs:
if type(raw_msg) != list:
raise ProtocolError("invalid type {0} for WAMP message".format(type(raw_msg)))
if len(raw_msg) == 0:
raise ProtocolError(u"missing message type in WAMP message")
message_type = raw_msg[0]
if type(message_type) != int:
raise ProtocolError("invalid type {0} for WAMP message type".format(type(message_type)))
Klass = self.MESSAGE_TYPE_MAP.get(message_type)
if Klass is None:
raise ProtocolError("invalid WAMP message type {0}".format(message_type))
# this might again raise `ProtocolError` ..
msg = Klass.parse(raw_msg)
msgs.append(msg)
return msgs
##
# JSON serialization is always supported
##
try:
# try import accelerated JSON implementation
##
import ujson
_json = ujson
def _loads(val):
return ujson.loads(val, precise_float=True)
def _dumps(obj):
return ujson.dumps(obj, double_precision=15, ensure_ascii=False)
except ImportError:
# fallback to stdlib implementation
##
import json
_json = json
_loads = json.loads
def _dumps(obj):
return json.dumps(obj, separators=(',', ':'), ensure_ascii=False)
finally:
class JsonObjectSerializer(object):
JSON_MODULE = _json
"""
The JSON module used (either stdib builtin or ujson).
"""
BINARY = False
def __init__(self, batched=False):
"""
Ctor.
:param batched: Flag that controls whether serializer operates in batched mode.
:type batched: bool
"""
self._batched = batched
def serialize(self, obj):
"""
Implements :func:`autobahn.wamp.interfaces.IObjectSerializer.serialize`
"""
s = _dumps(obj)
if isinstance(s, six.text_type):
s = s.encode('utf8')
if self._batched:
return s + b'\30'
else:
return s
def unserialize(self, payload):
"""
Implements :func:`autobahn.wamp.interfaces.IObjectSerializer.unserialize`
"""
if self._batched:
chunks = payload.split(b'\30')[:-1]
else:
chunks = [payload]
if len(chunks) == 0:
raise Exception("batch format error")
return [_loads(data.decode('utf8')) for data in chunks]
IObjectSerializer.register(JsonObjectSerializer)
class JsonSerializer(Serializer):
SERIALIZER_ID = "json"
"""
ID used as part of the WebSocket subprotocol name to identify the
serializer with WAMP-over-WebSocket.
"""
RAWSOCKET_SERIALIZER_ID = 1
"""
ID used in lower four bits of second octet in RawSocket opening
handshake identify the serializer with WAMP-over-RawSocket.
"""
MIME_TYPE = "application/json"
"""
MIME type announced in HTTP request/response headers when running
WAMP-over-Longpoll HTTP fallback.
"""
def __init__(self, batched=False):
"""
Ctor.
:param batched: Flag to control whether to put this serialized into batched mode.
:type batched: bool
"""
Serializer.__init__(self, JsonObjectSerializer(batched=batched))
if batched:
self.SERIALIZER_ID = "json.batched"
ISerializer.register(JsonSerializer)
##
# MsgPack serialization depends on the `msgpack` package being available
##
try:
import msgpack
except ImportError:
pass
else:
class MsgPackObjectSerializer(object):
BINARY = True
"""
Flag that indicates whether this serializer needs a binary clean transport.
"""
ENABLE_V5 = True
"""
Enable version 5 of the MsgPack specification (which differentiates
between strings and binary).
"""
def __init__(self, batched=False):
"""
Ctor.
:param batched: Flag that controls whether serializer operates in batched mode.
:type batched: bool
"""
self._batched = batched
def serialize(self, obj):
"""
Implements :func:`autobahn.wamp.interfaces.IObjectSerializer.serialize`
"""
data = msgpack.packb(obj, use_bin_type=self.ENABLE_V5)
if self._batched:
return struct.pack("!L", len(data)) + data
else:
return data
def unserialize(self, payload):
"""
Implements :func:`autobahn.wamp.interfaces.IObjectSerializer.unserialize`
"""
if self._batched:
msgs = []
N = len(payload)
i = 0
while i < N:
# read message length prefix
if i + 4 > N:
raise Exception("batch format error [1]")
l = struct.unpack("!L", payload[i:i + 4])[0]
# read message data
if i + 4 + l > N:
raise Exception("batch format error [2]")
data = payload[i + 4:i + 4 + l]
# append parsed raw message
msgs.append(msgpack.unpackb(data, encoding='utf-8'))
# advance until everything consumed
i = i + 4 + l
if i != N:
raise Exception("batch format error [3]")
return msgs
else:
return [msgpack.unpackb(payload, encoding='utf-8')]
IObjectSerializer.register(MsgPackObjectSerializer)
__all__.append('MsgPackObjectSerializer')
class MsgPackSerializer(Serializer):
SERIALIZER_ID = "msgpack"
"""
ID used as part of the WebSocket subprotocol name to identify the
serializer with WAMP-over-WebSocket.
"""
RAWSOCKET_SERIALIZER_ID = 2
"""
ID used in lower four bits of second octet in RawSocket opening
handshake identify the serializer with WAMP-over-RawSocket.
"""
MIME_TYPE = "application/x-msgpack"
"""
MIME type announced in HTTP request/response headers when running
WAMP-over-Longpoll HTTP fallback.
"""
def __init__(self, batched=False):
"""
Ctor.
:param batched: Flag to control whether to put this serialized into batched mode.
:type batched: bool
"""
Serializer.__init__(self, MsgPackObjectSerializer(batched=batched))
if batched:
self.SERIALIZER_ID = "msgpack.batched"
ISerializer.register(MsgPackSerializer)
__all__.append('MsgPackSerializer')
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