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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.
#
"""
An AQMP client implementation that uses a custom delegate for
interacting with the server.
"""
import threading
from peer import Peer, Closed
from delegate import Delegate
from connection import Connection, Frame, connect
from spec import load
from queue import Queue
from reference import ReferenceId, References
class Client:
def __init__(self, host, port, spec, vhost = None):
self.host = host
self.port = port
self.spec = spec
self.mechanism = None
self.response = None
self.locale = None
self.vhost = vhost
if self.vhost == None:
self.vhost = self.host
self.queues = {}
self.lock = threading.Lock()
self.closed = False
self.reason = None
self.started = threading.Event()
def wait(self):
self.started.wait()
if self.closed:
raise Closed(self.reason)
def queue(self, key):
self.lock.acquire()
try:
try:
q = self.queues[key]
except KeyError:
q = Queue(0)
self.queues[key] = q
finally:
self.lock.release()
return q
def start(self, response, mechanism="AMQPLAIN", locale="en_US", tune_params=None):
self.mechanism = mechanism
self.response = response
self.locale = locale
self.tune_params = tune_params
self.socket = connect(self.host, self.port)
self.conn = Connection(self.socket, self.spec)
self.peer = Peer(self.conn, ClientDelegate(self), self.opened)
self.conn.init()
self.peer.start()
self.wait()
self.channel(0).connection_open(self.vhost)
def channel(self, id):
return self.peer.channel(id)
def opened(self, ch):
ch.references = References()
def close(self):
self.socket.close()
class ClientDelegate(Delegate):
def __init__(self, client):
Delegate.__init__(self)
self.client = client
def connection_start(self, ch, msg):
msg.start_ok(mechanism=self.client.mechanism,
response=self.client.response,
locale=self.client.locale)
def connection_tune(self, ch, msg):
if self.client.tune_params:
#todo: just override the params, i.e. don't require them
# all to be included in tune_params
msg.tune_ok(**self.client.tune_params)
else:
msg.tune_ok(*msg.frame.args)
self.client.started.set()
def message_transfer(self, ch, msg):
if isinstance(msg.body, ReferenceId):
msg.reference = ch.references.get(msg.body.id)
self.client.queue(msg.destination).put(msg)
def message_open(self, ch, msg):
ch.references.open(msg.reference)
def message_close(self, ch, msg):
ch.references.close(msg.reference)
def message_append(self, ch, msg):
ch.references.get(msg.reference).append(msg.bytes)
def basic_deliver(self, ch, msg):
self.client.queue(msg.consumer_tag).put(msg)
def channel_pong(self, ch, msg):
msg.ok()
def channel_close(self, ch, msg):
ch.close(msg)
def connection_close(self, ch, msg):
self.client.peer.close(msg)
def close(self, reason):
self.client.closed = True
self.client.reason = reason
self.client.started.set()
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