diff --git a/synapse/http/additional_resource.py b/synapse/http/additional_resource.py
index 096619a8c2..479746c9c5 100644
--- a/synapse/http/additional_resource.py
+++ b/synapse/http/additional_resource.py
@@ -13,13 +13,10 @@
# See the License for the specific language governing permissions and
# limitations under the License.
-from twisted.web.resource import Resource
-from twisted.web.server import NOT_DONE_YET
+from synapse.http.server import DirectServeJsonResource
-from synapse.http.server import wrap_json_request_handler
-
-class AdditionalResource(Resource):
+class AdditionalResource(DirectServeJsonResource):
"""Resource wrapper for additional_resources
If the user has configured additional_resources, we need to wrap the
@@ -41,16 +38,10 @@ class AdditionalResource(Resource):
handler ((twisted.web.server.Request) -> twisted.internet.defer.Deferred):
function to be called to handle the request.
"""
- Resource.__init__(self)
+ super().__init__()
self._handler = handler
- # required by the request_handler wrapper
- self.clock = hs.get_clock()
-
- def render(self, request):
- self._async_render(request)
- return NOT_DONE_YET
-
- @wrap_json_request_handler
def _async_render(self, request):
+ # Cheekily pass the result straight through, so we don't need to worry
+ # if its an awaitable or not.
return self._handler(request)
diff --git a/synapse/http/server.py b/synapse/http/server.py
index d192de7923..2b35f86066 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -14,6 +14,7 @@
# See the License for the specific language governing permissions and
# limitations under the License.
+import abc
import collections
import html
import logging
@@ -21,7 +22,7 @@ import types
import urllib
from http import HTTPStatus
from io import BytesIO
-from typing import Awaitable, Callable, TypeVar, Union
+from typing import Any, Callable, Dict, Tuple, Union
import jinja2
from canonicaljson import encode_canonical_json, encode_pretty_printed_json, json
@@ -62,99 +63,43 @@ HTML_ERROR_TEMPLATE = """<!DOCTYPE html>
"""
-def wrap_json_request_handler(h):
- """Wraps a request handler method with exception handling.
-
- Also does the wrapping with request.processing as per wrap_async_request_handler.
-
- The handler method must have a signature of "handle_foo(self, request)",
- where "request" must be a SynapseRequest.
-
- The handler must return a deferred or a coroutine. If the deferred succeeds
- we assume that a response has been sent. If the deferred fails with a SynapseError we use
- it to send a JSON response with the appropriate HTTP reponse code. If the
- deferred fails with any other type of error we send a 500 reponse.
+def return_json_error(f: failure.Failure, request: SynapseRequest) -> None:
+ """Sends a JSON error response to clients.
"""
- async def wrapped_request_handler(self, request):
- try:
- await h(self, request)
- except SynapseError as e:
- code = e.code
- logger.info("%s SynapseError: %s - %s", request, code, e.msg)
-
- # Only respond with an error response if we haven't already started
- # writing, otherwise lets just kill the connection
- if request.startedWriting:
- if request.transport:
- try:
- request.transport.abortConnection()
- except Exception:
- # abortConnection throws if the connection is already closed
- pass
- else:
- respond_with_json(
- request,
- code,
- e.error_dict(),
- send_cors=True,
- pretty_print=_request_user_agent_is_curl(request),
- )
-
- except Exception:
- # failure.Failure() fishes the original Failure out
- # of our stack, and thus gives us a sensible stack
- # trace.
- f = failure.Failure()
- logger.error(
- "Failed handle request via %r: %r",
- request.request_metrics.name,
- request,
- exc_info=(f.type, f.value, f.getTracebackObject()),
- )
- # Only respond with an error response if we haven't already started
- # writing, otherwise lets just kill the connection
- if request.startedWriting:
- if request.transport:
- try:
- request.transport.abortConnection()
- except Exception:
- # abortConnection throws if the connection is already closed
- pass
- else:
- respond_with_json(
- request,
- 500,
- {"error": "Internal server error", "errcode": Codes.UNKNOWN},
- send_cors=True,
- pretty_print=_request_user_agent_is_curl(request),
- )
-
- return wrap_async_request_handler(wrapped_request_handler)
-
-
-TV = TypeVar("TV")
-
-
-def wrap_html_request_handler(
- h: Callable[[TV, SynapseRequest], Awaitable]
-) -> Callable[[TV, SynapseRequest], Awaitable[None]]:
- """Wraps a request handler method with exception handling.
+ if f.check(SynapseError):
+ error_code = f.value.code
+ error_dict = f.value.error_dict()
- Also does the wrapping with request.processing as per wrap_async_request_handler.
-
- The handler method must have a signature of "handle_foo(self, request)",
- where "request" must be a SynapseRequest.
- """
+ logger.info("%s SynapseError: %s - %s", request, error_code, f.value.msg)
+ else:
+ error_code = 500
+ error_dict = {"error": "Internal server error", "errcode": Codes.UNKNOWN}
- async def wrapped_request_handler(self, request):
- try:
- await h(self, request)
- except Exception:
- f = failure.Failure()
- return_html_error(f, request, HTML_ERROR_TEMPLATE)
+ logger.error(
+ "Failed handle request via %r: %r",
+ request.request_metrics.name,
+ request,
+ exc_info=(f.type, f.value, f.getTracebackObject()),
+ )
- return wrap_async_request_handler(wrapped_request_handler)
+ # Only respond with an error response if we haven't already started writing,
+ # otherwise lets just kill the connection
+ if request.startedWriting:
+ if request.transport:
+ try:
+ request.transport.abortConnection()
+ except Exception:
+ # abortConnection throws if the connection is already closed
+ pass
+ else:
+ respond_with_json(
+ request,
+ error_code,
+ error_dict,
+ send_cors=True,
+ pretty_print=_request_user_agent_is_curl(request),
+ )
def return_html_error(
@@ -249,7 +194,113 @@ class HttpServer(object):
pass
-class JsonResource(HttpServer, resource.Resource):
+class _AsyncResource(resource.Resource, metaclass=abc.ABCMeta):
+ """Base class for resources that have async handlers.
+
+ Sub classes can either implement `_async_render_<METHOD>` to handle
+ requests by method, or override `_async_render` to handle all requests.
+
+ Args:
+ extract_context: Whether to attempt to extract the opentracing
+ context from the request the servlet is handling.
+ """
+
+ def __init__(self, extract_context=False):
+ super().__init__()
+
+ self._extract_context = extract_context
+
+ def render(self, request):
+ """ This gets called by twisted every time someone sends us a request.
+ """
+ defer.ensureDeferred(self._async_render_wrapper(request))
+ return NOT_DONE_YET
+
+ @wrap_async_request_handler
+ async def _async_render_wrapper(self, request):
+ """This is a wrapper that delegates to `_async_render` and handles
+ exceptions, return values, metrics, etc.
+ """
+ try:
+ request.request_metrics.name = self.__class__.__name__
+
+ with trace_servlet(request, self._extract_context):
+ callback_return = await self._async_render(request)
+
+ if callback_return is not None:
+ code, response = callback_return
+ self._send_response(request, code, response)
+ except Exception:
+ # failure.Failure() fishes the original Failure out
+ # of our stack, and thus gives us a sensible stack
+ # trace.
+ f = failure.Failure()
+ self._send_error_response(f, request)
+
+ async def _async_render(self, request):
+ """Delegates to `_async_render_<METHOD>` methods, or returns a 400 if
+ no appropriate method exists. Can be overriden in sub classes for
+ different routing.
+ """
+
+ method_handler = getattr(
+ self, "_async_render_%s" % (request.method.decode("ascii"),), None
+ )
+ if method_handler:
+ raw_callback_return = method_handler(request)
+
+ # Is it synchronous? We'll allow this for now.
+ if isinstance(raw_callback_return, (defer.Deferred, types.CoroutineType)):
+ callback_return = await raw_callback_return
+ else:
+ callback_return = raw_callback_return
+
+ return callback_return
+
+ _unrecognised_request_handler(request)
+
+ @abc.abstractmethod
+ def _send_response(
+ self, request: SynapseRequest, code: int, response_object: Any,
+ ) -> None:
+ raise NotImplementedError()
+
+ @abc.abstractmethod
+ def _send_error_response(
+ self, f: failure.Failure, request: SynapseRequest,
+ ) -> None:
+ raise NotImplementedError()
+
+
+class DirectServeJsonResource(_AsyncResource):
+ """A resource that will call `self._async_on_<METHOD>` on new requests,
+ formatting responses and errors as JSON.
+ """
+
+ def _send_response(
+ self, request, code, response_object,
+ ):
+ """Implements _AsyncResource._send_response
+ """
+ # TODO: Only enable CORS for the requests that need it.
+ respond_with_json(
+ request,
+ code,
+ response_object,
+ send_cors=True,
+ pretty_print=_request_user_agent_is_curl(request),
+ canonical_json=self.canonical_json,
+ )
+
+ def _send_error_response(
+ self, f: failure.Failure, request: SynapseRequest,
+ ) -> None:
+ """Implements _AsyncResource._send_error_response
+ """
+ return_json_error(f, request)
+
+
+class JsonResource(DirectServeJsonResource):
""" This implements the HttpServer interface and provides JSON support for
Resources.
@@ -269,17 +320,15 @@ class JsonResource(HttpServer, resource.Resource):
"_PathEntry", ["pattern", "callback", "servlet_classname"]
)
- def __init__(self, hs, canonical_json=True):
- resource.Resource.__init__(self)
+ def __init__(self, hs, canonical_json=True, extract_context=False):
+ super().__init__(extract_context)
self.canonical_json = canonical_json
self.clock = hs.get_clock()
self.path_regexs = {}
self.hs = hs
- def register_paths(
- self, method, path_patterns, callback, servlet_classname, trace=True
- ):
+ def register_paths(self, method, path_patterns, callback, servlet_classname):
"""
Registers a request handler against a regular expression. Later request URLs are
checked against these regular expressions in order to identify an appropriate
@@ -295,37 +344,42 @@ class JsonResource(HttpServer, resource.Resource):
servlet_classname (str): The name of the handler to be used in prometheus
and opentracing logs.
-
- trace (bool): Whether we should start a span to trace the servlet.
"""
method = method.encode("utf-8") # method is bytes on py3
- if trace:
- # We don't extract the context from the servlet because we can't
- # trust the sender
- callback = trace_servlet(servlet_classname)(callback)
-
for path_pattern in path_patterns:
logger.debug("Registering for %s %s", method, path_pattern.pattern)
self.path_regexs.setdefault(method, []).append(
self._PathEntry(path_pattern, callback, servlet_classname)
)
- def render(self, request):
- """ This gets called by twisted every time someone sends us a request.
+ def _get_handler_for_request(
+ self, request: SynapseRequest
+ ) -> Tuple[Callable, str, Dict[str, str]]:
+ """Finds a callback method to handle the given request.
+
+ Returns:
+ A tuple of the callback to use, the name of the servlet, and the
+ key word arguments to pass to the callback
"""
- defer.ensureDeferred(self._async_render(request))
- return NOT_DONE_YET
+ request_path = request.path.decode("ascii")
+
+ # Loop through all the registered callbacks to check if the method
+ # and path regex match
+ for path_entry in self.path_regexs.get(request.method, []):
+ m = path_entry.pattern.match(request_path)
+ if m:
+ # We found a match!
+ return path_entry.callback, path_entry.servlet_classname, m.groupdict()
+
+ # Huh. No one wanted to handle that? Fiiiiiine. Send 400.
+ return _unrecognised_request_handler, "unrecognised_request_handler", {}
- @wrap_json_request_handler
async def _async_render(self, request):
- """ This gets called from render() every time someone sends us a request.
- This checks if anyone has registered a callback for that method and
- path.
- """
callback, servlet_classname, group_dict = self._get_handler_for_request(request)
- # Make sure we have a name for this handler in prometheus.
+ # Make sure we have an appopriate name for this handler in prometheus
+ # (rather than the default of JsonResource).
request.request_metrics.name = servlet_classname
# Now trigger the callback. If it returns a response, we send it
@@ -338,81 +392,42 @@ class JsonResource(HttpServer, resource.Resource):
}
)
- callback_return = callback(request, **kwargs)
+ raw_callback_return = callback(request, **kwargs)
# Is it synchronous? We'll allow this for now.
- if isinstance(callback_return, (defer.Deferred, types.CoroutineType)):
- callback_return = await callback_return
+ if isinstance(raw_callback_return, (defer.Deferred, types.CoroutineType)):
+ callback_return = await raw_callback_return
+ else:
+ callback_return = raw_callback_return
- if callback_return is not None:
- code, response = callback_return
- self._send_response(request, code, response)
+ return callback_return
- def _get_handler_for_request(self, request):
- """Finds a callback method to handle the given request
- Args:
- request (twisted.web.http.Request):
+class DirectServeHtmlResource(_AsyncResource):
+ """A resource that will call `self._async_on_<METHOD>` on new requests,
+ formatting responses and errors as HTML.
+ """
- Returns:
- Tuple[Callable, str, dict[unicode, unicode]]: callback method, the
- label to use for that method in prometheus metrics, and the
- dict mapping keys to path components as specified in the
- handler's path match regexp.
-
- The callback will normally be a method registered via
- register_paths, so will return (possibly via Deferred) either
- None, or a tuple of (http code, response body).
- """
- request_path = request.path.decode("ascii")
-
- # Loop through all the registered callbacks to check if the method
- # and path regex match
- for path_entry in self.path_regexs.get(request.method, []):
- m = path_entry.pattern.match(request_path)
- if m:
- # We found a match!
- return path_entry.callback, path_entry.servlet_classname, m.groupdict()
-
- # Huh. No one wanted to handle that? Fiiiiiine. Send 400.
- return _unrecognised_request_handler, "unrecognised_request_handler", {}
+ # The error template to use for this resource
+ ERROR_TEMPLATE = HTML_ERROR_TEMPLATE
def _send_response(
- self, request, code, response_json_object, response_code_message=None
+ self, request: SynapseRequest, code: int, response_object: Any,
):
- # TODO: Only enable CORS for the requests that need it.
- respond_with_json(
- request,
- code,
- response_json_object,
- send_cors=True,
- response_code_message=response_code_message,
- pretty_print=_request_user_agent_is_curl(request),
- canonical_json=self.canonical_json,
- )
-
-
-class DirectServeResource(resource.Resource):
- def render(self, request):
+ """Implements _AsyncResource._send_response
"""
- Render the request, using an asynchronous render handler if it exists.
- """
- async_render_callback_name = "_async_render_" + request.method.decode("ascii")
-
- # Try and get the async renderer
- callback = getattr(self, async_render_callback_name, None)
+ # We expect to get bytes for us to write
+ assert isinstance(response_object, bytes)
+ html_bytes = response_object
- # No async renderer for this request method.
- if not callback:
- return super().render(request)
+ respond_with_html_bytes(request, 200, html_bytes)
- resp = trace_servlet(self.__class__.__name__)(callback)(request)
-
- # If it's a coroutine, turn it into a Deferred
- if isinstance(resp, types.CoroutineType):
- defer.ensureDeferred(resp)
-
- return NOT_DONE_YET
+ def _send_error_response(
+ self, f: failure.Failure, request: SynapseRequest,
+ ) -> None:
+ """Implements _AsyncResource._send_error_response
+ """
+ return_html_error(f, request, self.ERROR_TEMPLATE)
class StaticResource(File):
|
