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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
Components for connecting responder code to AMP and JSON-RPC network
transports.
"""
import types
try:
import json
except ImportError:
import simplejson as json
from twisted.internet import reactor
from twisted.internet.protocol import ServerFactory
from twisted.internet.endpoints import serverFromString
from twisted.internet.defer import maybeDeferred
from twisted.application.service import Service
from twisted.protocols import amp
from twisted.web import static
from twisted.web.resource import Resource
from twisted.web.server import NOT_DONE_YET, Site
from frack.responder import FrackResponder
class AMPFactory(ServerFactory):
"""
Factory for listening for AMP requests.
@param responder: An object that provides responders to AMP
commands.
"""
def __init__(self, responder):
self.responder = responder
def buildProtocol(self, addr):
disp = amp.BoxDispatcher(self.responder)
a = amp.AMP(boxReceiver=disp, locator=self.responder)
a.factory = self
return a
class AMPService(Service):
"""
Service for AMP listener.
@param port: An endpoint description, suitable for
`serverToString`.
@param responder: An object providing responders for AMP commands.
"""
def __init__(self, port, responder):
self.port = port
self.responder = responder
def startService(self):
self.endpoint = serverFromString(reactor, self.port)
self.endpoint.listen(AMPFactory(self.responder))
class JSONRPCService(Service):
"""
Service for JSON-RPC listener and web client.
@param port: An endpoint description, suitable for
`serverToString`.
@param responder: An object providing responders for AMP commands.
@param mediaPath: A filesystem path containing web client files.
"""
def __init__(self, port, responder, mediaPath):
self.port = port
self.responder = responder
self.mediaPath = mediaPath
self.root = Resource()
self.root.putChild('amp', JSONRPCFace(self.responder))
self.root.putChild('ui', static.File(self.mediaPath))
self.site = Site(self.root)
def startService(self):
self.endpoint = serverFromString(reactor, self.port)
self.endpoint.listen(self.site)
(INVALID_REQUEST, PARSE_ERROR,
UNKNOWN_ERROR, METHOD_NOT_FOUND
) = (-32600, -32700,
-32603, -32601)
class JSONRPCFace(Resource):
"""
A wrapper providing JSON-RPC access to AMP commands.
@param responder: An object providing responders for AMP commands.
"""
def __init__(self, responder):
Resource.__init__(self)
self.responder = responder
def _serialize(self, response, request):
request.write(json.dumps(response))
request.finish()
def _err(self, failure, request, qid):
return self._fail(request, UNKNOWN_ERROR,
str(failure.value), qid)
def _fail(self, request, code, msg, qid):
self._serialize({"jsonrpc": "2.0",
"error":
{"code": code,
"message": msg},
"id": qid},
request)
def _succeed(self, result, request, qid):
self._serialize({"jsonrpc": "2.0",
"result": result,
"id": qid},
request)
def _locateResponder(self, name):
cd = self.responder._commandDispatch
if name in cd:
commandClass, responderFunc = cd[name]
responderMethod = types.MethodType(
responderFunc, self.responder, self.responder.__class__)
return responderMethod
def render(self, request):
try:
q = json.loads(request.content.read())
except ValueError:
self._fail(request, PARSE_ERROR,
"No JSON object could be decoded", None)
return NOT_DONE_YET
qid = q.get('id')
if 'method' not in q:
self._fail(request, INVALID_REQUEST, "Not a JSON-RPC request", qid)
return NOT_DONE_YET
resp = self._locateResponder(q['method'])
if resp is None:
self._fail(request, METHOD_NOT_FOUND,
"Unhandled Command: %r" % (q['method'].encode('ascii'),), qid)
else:
self._invoke(request, resp, q.get('params') or {}, qid)
return NOT_DONE_YET
def _invoke(self, request, responder, params, qid):
d = maybeDeferred(responder,
**dict([(k.encode('ascii'), v)
for (k, v) in params.iteritems()]))
d.addCallback(self._succeed, request, qid)
d.addErrback(self._err, request, qid)
return d
def getChild(self, path, request):
if path == '':
return self
else:
return Resource.getChild(self, path, request)
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