327 lines
12 KiB
Python
327 lines
12 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014, 2015 OpenMarket Ltd
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#
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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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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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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from synapse.api.errors import (
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cs_exception, SynapseError, CodeMessageException, UnrecognizedRequestError
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)
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from synapse.util.logcontext import LoggingContext, PreserveLoggingContext
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import synapse.metrics
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import synapse.events
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from canonicaljson import (
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encode_canonical_json, encode_pretty_printed_json
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)
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from twisted.internet import defer
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from twisted.web import server, resource
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from twisted.web.server import NOT_DONE_YET
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from twisted.web.util import redirectTo
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import collections
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import logging
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import urllib
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import ujson
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logger = logging.getLogger(__name__)
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metrics = synapse.metrics.get_metrics_for(__name__)
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incoming_requests_counter = metrics.register_counter(
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"requests",
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labels=["method", "servlet"],
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)
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outgoing_responses_counter = metrics.register_counter(
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"responses",
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labels=["method", "code"],
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)
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response_timer = metrics.register_distribution(
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"response_time",
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labels=["method", "servlet"]
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)
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_next_request_id = 0
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def request_handler(request_handler):
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"""Wraps a method that acts as a request handler with the necessary logging
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and exception handling.
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The method must have a signature of "handle_foo(self, request)". The
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argument "self" must have "version_string" and "clock" attributes. The
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argument "request" must be a twisted HTTP request.
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The method must return a deferred. If the deferred succeeds we assume that
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a response has been sent. If the deferred fails with a SynapseError we use
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it to send a JSON response with the appropriate HTTP reponse code. If the
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deferred fails with any other type of error we send a 500 reponse.
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We insert a unique request-id into the logging context for this request and
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log the response and duration for this request.
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"""
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@defer.inlineCallbacks
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def wrapped_request_handler(self, request):
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global _next_request_id
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request_id = "%s-%s" % (request.method, _next_request_id)
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_next_request_id += 1
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with LoggingContext(request_id) as request_context:
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request_context.request = request_id
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with request.processing():
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try:
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d = request_handler(self, request)
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with PreserveLoggingContext():
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yield d
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except CodeMessageException as e:
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code = e.code
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if isinstance(e, SynapseError):
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logger.info(
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"%s SynapseError: %s - %s", request, code, e.msg
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)
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else:
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logger.exception(e)
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outgoing_responses_counter.inc(request.method, str(code))
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respond_with_json(
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request, code, cs_exception(e), send_cors=True,
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pretty_print=_request_user_agent_is_curl(request),
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version_string=self.version_string,
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)
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except:
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logger.exception(
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"Failed handle request %s.%s on %r: %r",
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request_handler.__module__,
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request_handler.__name__,
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self,
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request
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)
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respond_with_json(
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request,
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500,
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{"error": "Internal server error"},
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send_cors=True
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)
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return wrapped_request_handler
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class HttpServer(object):
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""" Interface for registering callbacks on a HTTP server
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"""
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def register_paths(self, method, path_patterns, callback):
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""" Register a callback that gets fired if we receive a http request
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with the given method for a path that matches the given regex.
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If the regex contains groups these gets passed to the calback via
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an unpacked tuple.
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Args:
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method (str): The method to listen to.
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path_patterns (list<SRE_Pattern>): The regex used to match requests.
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callback (function): The function to fire if we receive a matched
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request. The first argument will be the request object and
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subsequent arguments will be any matched groups from the regex.
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This should return a tuple of (code, response).
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"""
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pass
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class JsonResource(HttpServer, resource.Resource):
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""" This implements the HttpServer interface and provides JSON support for
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Resources.
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Register callbacks via register_path()
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Callbacks can return a tuple of status code and a dict in which case the
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the dict will automatically be sent to the client as a JSON object.
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The JsonResource is primarily intended for returning JSON, but callbacks
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may send something other than JSON, they may do so by using the methods
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on the request object and instead returning None.
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"""
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isLeaf = True
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_PathEntry = collections.namedtuple("_PathEntry", ["pattern", "callback"])
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def __init__(self, hs, canonical_json=True):
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resource.Resource.__init__(self)
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self.canonical_json = canonical_json
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self.clock = hs.get_clock()
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self.path_regexs = {}
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self.version_string = hs.version_string
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self.hs = hs
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def register_paths(self, method, path_patterns, callback):
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for path_pattern in path_patterns:
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self.path_regexs.setdefault(method, []).append(
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self._PathEntry(path_pattern, callback)
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)
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def render(self, request):
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""" This gets called by twisted every time someone sends us a request.
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"""
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self._async_render(request)
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return server.NOT_DONE_YET
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@request_handler
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@defer.inlineCallbacks
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def _async_render(self, request):
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""" This gets called from render() every time someone sends us a request.
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This checks if anyone has registered a callback for that method and
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path.
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"""
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start = self.clock.time_msec()
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if request.method == "OPTIONS":
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self._send_response(request, 200, {})
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return
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# Loop through all the registered callbacks to check if the method
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# and path regex match
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for path_entry in self.path_regexs.get(request.method, []):
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m = path_entry.pattern.match(request.path)
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if not m:
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continue
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# We found a match! Trigger callback and then return the
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# returned response. We pass both the request and any
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# matched groups from the regex to the callback.
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callback = path_entry.callback
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servlet_instance = getattr(callback, "__self__", None)
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if servlet_instance is not None:
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servlet_classname = servlet_instance.__class__.__name__
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else:
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servlet_classname = "%r" % callback
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incoming_requests_counter.inc(request.method, servlet_classname)
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args = [
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urllib.unquote(u).decode("UTF-8") if u else u for u in m.groups()
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]
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callback_return = yield callback(request, *args)
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if callback_return is not None:
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code, response = callback_return
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self._send_response(request, code, response)
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response_timer.inc_by(
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self.clock.time_msec() - start, request.method, servlet_classname
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)
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return
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# Huh. No one wanted to handle that? Fiiiiiine. Send 400.
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raise UnrecognizedRequestError()
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def _send_response(self, request, code, response_json_object,
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response_code_message=None):
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# could alternatively use request.notifyFinish() and flip a flag when
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# the Deferred fires, but since the flag is RIGHT THERE it seems like
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# a waste.
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if request._disconnected:
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logger.warn(
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"Not sending response to request %s, already disconnected.",
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request)
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return
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outgoing_responses_counter.inc(request.method, str(code))
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# TODO: Only enable CORS for the requests that need it.
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respond_with_json(
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request, code, response_json_object,
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send_cors=True,
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response_code_message=response_code_message,
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pretty_print=_request_user_agent_is_curl(request),
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version_string=self.version_string,
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canonical_json=self.canonical_json,
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)
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class RootRedirect(resource.Resource):
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"""Redirects the root '/' path to another path."""
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def __init__(self, path):
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resource.Resource.__init__(self)
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self.url = path
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def render_GET(self, request):
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return redirectTo(self.url, request)
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def getChild(self, name, request):
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if len(name) == 0:
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return self # select ourselves as the child to render
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return resource.Resource.getChild(self, name, request)
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def respond_with_json(request, code, json_object, send_cors=False,
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response_code_message=None, pretty_print=False,
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version_string="", canonical_json=True):
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if pretty_print:
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json_bytes = encode_pretty_printed_json(json_object) + "\n"
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else:
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if canonical_json or synapse.events.USE_FROZEN_DICTS:
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json_bytes = encode_canonical_json(json_object)
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else:
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# ujson doesn't like frozen_dicts.
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json_bytes = ujson.dumps(json_object, ensure_ascii=False)
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return respond_with_json_bytes(
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request, code, json_bytes,
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send_cors=send_cors,
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response_code_message=response_code_message,
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version_string=version_string
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)
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def respond_with_json_bytes(request, code, json_bytes, send_cors=False,
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version_string="", response_code_message=None):
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"""Sends encoded JSON in response to the given request.
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Args:
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request (twisted.web.http.Request): The http request to respond to.
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code (int): The HTTP response code.
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json_bytes (bytes): The json bytes to use as the response body.
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send_cors (bool): Whether to send Cross-Origin Resource Sharing headers
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http://www.w3.org/TR/cors/
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Returns:
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twisted.web.server.NOT_DONE_YET"""
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request.setResponseCode(code, message=response_code_message)
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request.setHeader(b"Content-Type", b"application/json")
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request.setHeader(b"Server", version_string)
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request.setHeader(b"Content-Length", b"%d" % (len(json_bytes),))
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if send_cors:
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request.setHeader("Access-Control-Allow-Origin", "*")
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request.setHeader("Access-Control-Allow-Methods",
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"GET, POST, PUT, DELETE, OPTIONS")
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request.setHeader("Access-Control-Allow-Headers",
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"Origin, X-Requested-With, Content-Type, Accept")
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request.write(json_bytes)
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request.finish()
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return NOT_DONE_YET
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def _request_user_agent_is_curl(request):
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user_agents = request.requestHeaders.getRawHeaders(
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"User-Agent", default=[]
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)
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for user_agent in user_agents:
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if "curl" in user_agent:
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return True
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return False
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