80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
"""
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Copyright 2013 Rackspace, Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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"""
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import simplejson as json
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import uuid
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from twisted.protocols.basic import LineReceiver
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from twisted.internet.defer import maybeDeferred
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from twisted.internet import defer
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DEFAULT_PROTOCOL_VERSION = 'v1'
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class TeethAgentProtocol(LineReceiver):
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def __init__(self, encoder):
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self.encoder = encoder
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self.handlers = {}
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self.pending_command_deferreds = {}
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def lineReceived(self, line):
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line = line.strip()
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if not line:
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return
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message = json.loads(line)
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if 'method' in message:
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self.handle_command(message)
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elif 'result' in message:
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self.handle_response(message)
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def send_command(self, command):
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message_id = str(uuid.uuid4())
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d = defer.Deferred()
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self.pending_command_deferreds[message_id] = d
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self.sendLine(self.encoder.encode({
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'id': message_id,
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'version': DEFAULT_PROTOCOL_VERSION,
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'method': command['method'],
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'args': command.get('args', []),
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'kwargs': command.get('kwargs', {}),
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}))
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return d
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def handle_command(self, message):
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message_id = message['id']
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version = message['version']
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args = message.get('args', [])
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kwargs = message.get('kwargs', {})
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d = maybeDeferred(self.handlers[version][message['method']], *args, **kwargs)
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d.addCallback(self.send_response, version, message_id)
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def send_response(self, result, version, message_id):
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self.sendLine(self.encoder.encode({
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'id': message_id,
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'version': version,
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'result': result,
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}))
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def handle_response(self, message):
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d = self.pending_command_deferreds.pop(message['id'])
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error = message.get('error', None)
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if error:
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d.errback(error)
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else:
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d.callback(message.get('result', None))
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