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#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
from qpid.codec010 import StringCodec
from qpid.ops import PRIMITIVE
def codec(name):
type = PRIMITIVE[name]
def encode(x):
sc = StringCodec()
sc.write_primitive(type, x)
return sc.encoded
def decode(x):
sc = StringCodec(x)
return sc.read_primitive(type)
return encode, decode
# XXX: need to correctly parse the mime type and deal with
# content-encoding header
TYPE_MAPPINGS={
dict: "amqp/map",
list: "amqp/list",
unicode: "text/plain; charset=utf8",
unicode: "text/plain",
buffer: None,
str: None,
None.__class__: None
}
DEFAULT_CODEC = (lambda x: x, lambda x: x)
def encode_text_plain(x):
if x is None:
return None
else:
return x.encode("utf8")
def decode_text_plain(x):
if x is None:
return None
else:
return x.decode("utf8")
TYPE_CODEC={
"amqp/map": codec("map"),
"amqp/list": codec("list"),
"text/plain; charset=utf8": (encode_text_plain, decode_text_plain),
"text/plain": (encode_text_plain, decode_text_plain),
"": DEFAULT_CODEC,
None: DEFAULT_CODEC
}
def get_type(content):
return TYPE_MAPPINGS[content.__class__]
def get_codec(content_type):
return TYPE_CODEC.get(content_type, DEFAULT_CODEC)
UNSPECIFIED = object()
class Message:
"""
A message consists of a standard set of fields, an application
defined set of properties, and some content.
@type id: str
@ivar id: the message id
@type subject: str
@ivar subject: message subject
@type user_id: str
@ivar user_id: the user-id of the message producer
@type reply_to: str
@ivar reply_to: the address to send replies
@type correlation_id: str
@ivar correlation_id: a correlation-id for the message
@type durable: bool
@ivar durable: message durability
@type priority: int
@ivar priority: message priority
@type ttl: float
@ivar ttl: time-to-live measured in seconds
@type properties: dict
@ivar properties: application specific message properties
@type content_type: str
@ivar content_type: the content-type of the message
@type content: str, unicode, buffer, dict, list
@ivar content: the message content
"""
def __init__(self, content=None, content_type=UNSPECIFIED, id=None,
subject=None, user_id=None, reply_to=None, correlation_id=None,
durable=None, priority=None, ttl=None, properties=None):
"""
Construct a new message with the supplied content. The
content-type of the message will be automatically inferred from
type of the content parameter.
@type content: str, unicode, buffer, dict, list
@param content: the message content
@type content_type: str
@param content_type: the content-type of the message
"""
self.id = id
self.subject = subject
self.user_id = user_id
self.reply_to = reply_to
self.correlation_id = correlation_id
self.durable = durable
self.priority = priority
self.ttl = ttl
self.redelivered = False
if properties is None:
self.properties = {}
else:
self.properties = properties
if content_type is UNSPECIFIED:
self.content_type = get_type(content)
else:
self.content_type = content_type
self.content = content
def __repr__(self):
args = []
for name in ["id", "subject", "user_id", "reply_to", "correlation_id",
"priority", "ttl"]:
value = self.__dict__[name]
if value is not None: args.append("%s=%r" % (name, value))
for name in ["durable", "redelivered", "properties"]:
value = self.__dict__[name]
if value: args.append("%s=%r" % (name, value))
if self.content_type != get_type(self.content):
args.append("content_type=%r" % self.content_type)
if self.content is not None:
if args:
args.append("content=%r" % self.content)
else:
args.append(repr(self.content))
return "Message(%s)" % ", ".join(args)
class Disposition:
def __init__(self, type, **options):
self.type = type
self.options = options
def __repr__(self):
args = [str(self.type)] + \
["%s=%r" % (k, v) for k, v in self.options.items()]
return "Disposition(%s)" % ", ".join(args)
__all__ = ["Message", "Disposition"]
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