Make the http server handle coroutine-making REST servlets (#5475)

5 files changed, 47 insertions, 68 deletions

diff --git a/synapse/rest/media/v1/config_resource.py b/synapse/rest/media/v1/config_resource.py
index fa3d6680fc..9f747de263 100644
--- a/synapse/rest/media/v1/config_resource.py
+++ b/synapse/rest/media/v1/config_resource.py
@@ -14,31 +14,28 @@
 # limitations under the License.
 #
 
-from twisted.internet import defer
-from twisted.web.resource import Resource
 from twisted.web.server import NOT_DONE_YET
 
-from synapse.http.server import respond_with_json, wrap_json_request_handler
+from synapse.http.server import (
+    DirectServeResource,
+    respond_with_json,
+    wrap_json_request_handler,
+)
 
 
-class MediaConfigResource(Resource):
+class MediaConfigResource(DirectServeResource):
     isLeaf = True
 
     def __init__(self, hs):
-        Resource.__init__(self)
+        super().__init__()
         config = hs.get_config()
         self.clock = hs.get_clock()
         self.auth = hs.get_auth()
         self.limits_dict = {"m.upload.size": config.max_upload_size}
 
-    def render_GET(self, request):
-        self._async_render_GET(request)
-        return NOT_DONE_YET
-
     @wrap_json_request_handler
-    @defer.inlineCallbacks
-    def _async_render_GET(self, request):
-        yield self.auth.get_user_by_req(request)
+    async def _async_render_GET(self, request):
+        await self.auth.get_user_by_req(request)
         respond_with_json(request, 200, self.limits_dict, send_cors=True)
 
     def render_OPTIONS(self, request):
diff --git a/synapse/rest/media/v1/download_resource.py b/synapse/rest/media/v1/download_resource.py
index a21a35f843..66a01559e1 100644
--- a/synapse/rest/media/v1/download_resource.py
+++ b/synapse/rest/media/v1/download_resource.py
@@ -14,37 +14,31 @@
 # limitations under the License.
 import logging
 
-from twisted.internet import defer
-from twisted.web.resource import Resource
-from twisted.web.server import NOT_DONE_YET
-
 import synapse.http.servlet
-from synapse.http.server import set_cors_headers, wrap_json_request_handler
+from synapse.http.server import (
+    DirectServeResource,
+    set_cors_headers,
+    wrap_json_request_handler,
+)
 
 from ._base import parse_media_id, respond_404
 
 logger = logging.getLogger(__name__)
 
 
-class DownloadResource(Resource):
+class DownloadResource(DirectServeResource):
     isLeaf = True
 
     def __init__(self, hs, media_repo):
-        Resource.__init__(self)
-
+        super().__init__()
         self.media_repo = media_repo
         self.server_name = hs.hostname
 
         # this is expected by @wrap_json_request_handler
         self.clock = hs.get_clock()
 
-    def render_GET(self, request):
-        self._async_render_GET(request)
-        return NOT_DONE_YET
-
     @wrap_json_request_handler
-    @defer.inlineCallbacks
-    def _async_render_GET(self, request):
+    async def _async_render_GET(self, request):
         set_cors_headers(request)
         request.setHeader(
             b"Content-Security-Policy",
@@ -58,7 +52,7 @@ class DownloadResource(Resource):
         )
         server_name, media_id, name = parse_media_id(request)
         if server_name == self.server_name:
-            yield self.media_repo.get_local_media(request, media_id, name)
+            await self.media_repo.get_local_media(request, media_id, name)
         else:
             allow_remote = synapse.http.servlet.parse_boolean(
                 request, "allow_remote", default=True
@@ -72,4 +66,4 @@ class DownloadResource(Resource):
                 respond_404(request)
                 return
 
-            yield self.media_repo.get_remote_media(request, server_name, media_id, name)
+            await self.media_repo.get_remote_media(request, server_name, media_id, name)
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index de6f292ffb..0337b64dc2 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -32,12 +32,11 @@ from canonicaljson import json
 
 from twisted.internet import defer
 from twisted.internet.error import DNSLookupError
-from twisted.web.resource import Resource
-from twisted.web.server import NOT_DONE_YET
 
 from synapse.api.errors import Codes, SynapseError
 from synapse.http.client import SimpleHttpClient
 from synapse.http.server import (
+    DirectServeResource,
     respond_with_json,
     respond_with_json_bytes,
     wrap_json_request_handler,
@@ -58,11 +57,11 @@ _charset_match = re.compile(br"<\s*meta[^>]*charset\s*=\s*([a-z0-9-]+)", flags=r
 _content_type_match = re.compile(r'.*; *charset="?(.*?)"?(;|$)', flags=re.I)
 
 
-class PreviewUrlResource(Resource):
+class PreviewUrlResource(DirectServeResource):
     isLeaf = True
 
     def __init__(self, hs, media_repo, media_storage):
-        Resource.__init__(self)
+        super().__init__()
 
         self.auth = hs.get_auth()
         self.clock = hs.get_clock()
@@ -98,16 +97,11 @@ class PreviewUrlResource(Resource):
     def render_OPTIONS(self, request):
         return respond_with_json(request, 200, {}, send_cors=True)
 
-    def render_GET(self, request):
-        self._async_render_GET(request)
-        return NOT_DONE_YET
-
     @wrap_json_request_handler
-    @defer.inlineCallbacks
-    def _async_render_GET(self, request):
+    async def _async_render_GET(self, request):
 
         # XXX: if get_user_by_req fails, what should we do in an async render?
-        requester = yield self.auth.get_user_by_req(request)
+        requester = await self.auth.get_user_by_req(request)
         url = parse_string(request, "url")
         if b"ts" in request.args:
             ts = parse_integer(request, "ts")
@@ -159,7 +153,7 @@ class PreviewUrlResource(Resource):
         else:
             logger.info("Returning cached response")
 
-        og = yield make_deferred_yieldable(observable.observe())
+        og = await make_deferred_yieldable(defer.maybeDeferred(observable.observe))
         respond_with_json_bytes(request, 200, og, send_cors=True)
 
     @defer.inlineCallbacks
diff --git a/synapse/rest/media/v1/thumbnail_resource.py b/synapse/rest/media/v1/thumbnail_resource.py
index ca84c9f139..08329884ac 100644
--- a/synapse/rest/media/v1/thumbnail_resource.py
+++ b/synapse/rest/media/v1/thumbnail_resource.py
@@ -17,10 +17,12 @@
 import logging
 
 from twisted.internet import defer
-from twisted.web.resource import Resource
-from twisted.web.server import NOT_DONE_YET
 
-from synapse.http.server import set_cors_headers, wrap_json_request_handler
+from synapse.http.server import (
+    DirectServeResource,
+    set_cors_headers,
+    wrap_json_request_handler,
+)
 from synapse.http.servlet import parse_integer, parse_string
 
 from ._base import (
@@ -34,11 +36,11 @@ from ._base import (
 logger = logging.getLogger(__name__)
 
 
-class ThumbnailResource(Resource):
+class ThumbnailResource(DirectServeResource):
     isLeaf = True
 
     def __init__(self, hs, media_repo, media_storage):
-        Resource.__init__(self)
+        super().__init__()
 
         self.store = hs.get_datastore()
         self.media_repo = media_repo
@@ -47,13 +49,8 @@ class ThumbnailResource(Resource):
         self.server_name = hs.hostname
         self.clock = hs.get_clock()
 
-    def render_GET(self, request):
-        self._async_render_GET(request)
-        return NOT_DONE_YET
-
     @wrap_json_request_handler
-    @defer.inlineCallbacks
-    def _async_render_GET(self, request):
+    async def _async_render_GET(self, request):
         set_cors_headers(request)
         server_name, media_id, _ = parse_media_id(request)
         width = parse_integer(request, "width", required=True)
@@ -63,21 +60,21 @@ class ThumbnailResource(Resource):
 
         if server_name == self.server_name:
             if self.dynamic_thumbnails:
-                yield self._select_or_generate_local_thumbnail(
+                await self._select_or_generate_local_thumbnail(
                     request, media_id, width, height, method, m_type
                 )
             else:
-                yield self._respond_local_thumbnail(
+                await self._respond_local_thumbnail(
                     request, media_id, width, height, method, m_type
                 )
             self.media_repo.mark_recently_accessed(None, media_id)
         else:
             if self.dynamic_thumbnails:
-                yield self._select_or_generate_remote_thumbnail(
+                await self._select_or_generate_remote_thumbnail(
                     request, server_name, media_id, width, height, method, m_type
                 )
             else:
-                yield self._respond_remote_thumbnail(
+                await self._respond_remote_thumbnail(
                     request, server_name, media_id, width, height, method, m_type
                 )
             self.media_repo.mark_recently_accessed(server_name, media_id)
diff --git a/synapse/rest/media/v1/upload_resource.py b/synapse/rest/media/v1/upload_resource.py
index d1d7e959f0..5d76bbdf68 100644
--- a/synapse/rest/media/v1/upload_resource.py
+++ b/synapse/rest/media/v1/upload_resource.py
@@ -15,22 +15,24 @@
 
 import logging
 
-from twisted.internet import defer
-from twisted.web.resource import Resource
 from twisted.web.server import NOT_DONE_YET
 
 from synapse.api.errors import SynapseError
-from synapse.http.server import respond_with_json, wrap_json_request_handler
+from synapse.http.server import (
+    DirectServeResource,
+    respond_with_json,
+    wrap_json_request_handler,
+)
 from synapse.http.servlet import parse_string
 
 logger = logging.getLogger(__name__)
 
 
-class UploadResource(Resource):
+class UploadResource(DirectServeResource):
     isLeaf = True
 
     def __init__(self, hs, media_repo):
-        Resource.__init__(self)
+        super().__init__()
 
         self.media_repo = media_repo
         self.filepaths = media_repo.filepaths
@@ -41,18 +43,13 @@ class UploadResource(Resource):
         self.max_upload_size = hs.config.max_upload_size
         self.clock = hs.get_clock()
 
-    def render_POST(self, request):
-        self._async_render_POST(request)
-        return NOT_DONE_YET
-
     def render_OPTIONS(self, request):
         respond_with_json(request, 200, {}, send_cors=True)
         return NOT_DONE_YET
 
     @wrap_json_request_handler
-    @defer.inlineCallbacks
-    def _async_render_POST(self, request):
-        requester = yield self.auth.get_user_by_req(request)
+    async def _async_render_POST(self, request):
+        requester = await self.auth.get_user_by_req(request)
         # TODO: The checks here are a bit late. The content will have
         # already been uploaded to a tmp file at this point
         content_length = request.getHeader(b"Content-Length").decode("ascii")
@@ -81,7 +78,7 @@ class UploadResource(Resource):
         #     disposition = headers.getRawHeaders(b"Content-Disposition")[0]
         # TODO(markjh): parse content-dispostion
 
-        content_uri = yield self.media_repo.create_content(
+        content_uri = await self.media_repo.create_content(
             media_type, upload_name, request.content, content_length, requester.user
         )