Fix mypy complaints, simplifying code while we're at it

src/allmydata/storage/http_server.py

@@ -695,7 +695,7 @@ class HTTPServer(BaseApp):
         if accept.best == CBOR_MIME_TYPE:
             request.setHeader("Content-Type", CBOR_MIME_TYPE)
             f = TemporaryFile()
-            cbor2.dump(data, f)
+            cbor2.dump(data, f)  # type: ignore
 
             def read_data(offset: int, length: int) -> bytes:
                 f.seek(offset)

src/allmydata/web/common.py

@@ -6,7 +6,7 @@ from __future__ import annotations
 from six import ensure_str
 from importlib.resources import files as resource_files, as_file
 from contextlib import ExitStack
-
+import weakref
 from typing import Optional, Union, TypeVar, overload
 from typing_extensions import Literal
 
@@ -857,26 +857,19 @@ def get_keypair(request: IRequest) -> tuple[PublicKey, PrivateKey] | None:
     return pubkey, privkey
 
 
-class StaticFiles:
+def add_static_children(root: IResource):
     """
-    Serve static files includes as resources.
+    Add static files from C{allmydata.web} to the given resource.
 
     Package resources may be on the filesystem, or they may be in a zip
     or something, so we need to do a bit more work to serve them as
     static files.
     """
-
+    temporary_file_manager = ExitStack()
-    def __init__(self):
-        self._temporary_file_manager = ExitStack()
-
-    @classmethod
-    def add_static_children(cls, root: IResource):
-        """Add static files from C{allmydata.web} to the given resource."""
-        self = cls()
     static_dir = resource_files("allmydata.web") / "static"
     for child in static_dir.iterdir():
         child_path = child.name.encode("utf-8")
         root.putChild(child_path, static.File(
-                self._temporary_file_manager.enter_context(as_file(child))
+            temporary_file_manager.enter_context(as_file(child))
         ))
-        root.__static_files_cleanup = self
+    weakref.finalize(root, temporary_file_manager.close)

src/allmydata/web/introweb.py

@@ -10,7 +10,7 @@ from allmydata.web.common import (
     render_time,
     MultiFormatResource,
     SlotsSequenceElement,
-    StaticFiles
+    add_static_children,
 )
 
 
@@ -28,7 +28,7 @@ class IntroducerRoot(MultiFormatResource):
         self.introducer_service = introducer_node.getServiceNamed("introducer")
         # necessary as a root Resource
         self.putChild(b"", self)
-        StaticFiles.add_static_children(self)
+        add_static_children(self)
 
     def _create_element(self):
         """

src/allmydata/web/root.py

@@ -42,7 +42,7 @@ from allmydata.web.common import (
     render_time_delta,
     render_time,
     render_time_attr,
-    StaticFiles,
+    add_static_children,
 )
 from allmydata.web.private import (
     create_private_tree,
@@ -242,7 +242,7 @@ class Root(MultiFormatResource):
         self.putChild(b"statistics", status.Statistics(client.stats_provider))
         self.putChild(b"report_incident", IncidentReporter())
 
-        StaticFiles.add_static_children(self)
+        add_static_children(self)
 
     @exception_to_child
     def getChild(self, path, request):