gracefully terminate web server

In previous revisions server was terminated by itself, thus no lock or
socket was removed. In new version, graceful termination of the queue
has been added as well as server now handles singals

src/ahriman/application/handlers/web.py

@@ -55,3 +55,7 @@ class Web(Handler):
 
         application = setup_service(architecture, configuration, spawner)
         run_server(application)
+
+        # terminate spawn process at the last
+        spawner.stop()
+        spawner.join()

src/ahriman/core/spawn.py

@@ -60,7 +60,7 @@ class Spawn(Thread, LazyLogging):
         self.lock = Lock()
         self.active: Dict[str, Process] = {}
         # stupid pylint does not know that it is possible
-        self.queue: Queue[Tuple[str, bool]] = Queue()  # pylint: disable=unsubscriptable-object
+        self.queue: Queue[Tuple[str, bool] | None] = Queue()  # pylint: disable=unsubscriptable-object
 
     @staticmethod
     def process(callback: Callable[[argparse.Namespace, str], bool], args: argparse.Namespace, architecture: str,
@@ -78,55 +78,7 @@ class Spawn(Thread, LazyLogging):
         result = callback(args, architecture)
         queue.put((process_id, result))
 
-    def key_import(self, key: str, server: Optional[str]) -> None:
-        """
-        import key to service cache
-
-        Args:
-            key(str): key to import
-            server(str): PGP key server
-        """
-        kwargs = {} if server is None else {"key-server": server}
-        self.spawn_process("service-key-import", key, **kwargs)
-
-    def packages_add(self, packages: Iterable[str], *, now: bool) -> None:
-        """
-        add packages
-
-        Args:
-            packages(Iterable[str]): packages list to add
-            now(bool): build packages now
-        """
-        kwargs = {"source": PackageSource.AUR.value}  # avoid abusing by building non-aur packages
-        if now:
-            kwargs["now"] = ""
-        self.spawn_process("package-add", *packages, **kwargs)
-
-    def packages_rebuild(self, depends_on: str) -> None:
-        """
-        rebuild packages which depend on the specified package
-
-        Args:
-            depends_on(str): packages dependency
-        """
-        self.spawn_process("repo-rebuild", **{"depends-on": depends_on})
-
-    def packages_remove(self, packages: Iterable[str]) -> None:
-        """
-        remove packages
-
-        Args:
-            packages(Iterable[str]): packages list to remove
-        """
-        self.spawn_process("package-remove", *packages)
-
-    def packages_update(self, ) -> None:
-        """
-        run full repository update
-        """
-        self.spawn_process("repo-update")
-
-    def spawn_process(self, command: str, *args: str, **kwargs: str) -> None:
+    def _spawn_process(self, command: str, *args: str, **kwargs: str) -> None:
         """
         spawn external ahriman process with supplied arguments
 
@@ -161,6 +113,54 @@ class Spawn(Thread, LazyLogging):
         with self.lock:
             self.active[process_id] = process
 
+    def key_import(self, key: str, server: Optional[str]) -> None:
+        """
+        import key to service cache
+
+        Args:
+            key(str): key to import
+            server(str): PGP key server
+        """
+        kwargs = {} if server is None else {"key-server": server}
+        self._spawn_process("service-key-import", key, **kwargs)
+
+    def packages_add(self, packages: Iterable[str], *, now: bool) -> None:
+        """
+        add packages
+
+        Args:
+            packages(Iterable[str]): packages list to add
+            now(bool): build packages now
+        """
+        kwargs = {"source": PackageSource.AUR.value}  # avoid abusing by building non-aur packages
+        if now:
+            kwargs["now"] = ""
+        self._spawn_process("package-add", *packages, **kwargs)
+
+    def packages_rebuild(self, depends_on: str) -> None:
+        """
+        rebuild packages which depend on the specified package
+
+        Args:
+            depends_on(str): packages dependency
+        """
+        self._spawn_process("repo-rebuild", **{"depends-on": depends_on})
+
+    def packages_remove(self, packages: Iterable[str]) -> None:
+        """
+        remove packages
+
+        Args:
+            packages(Iterable[str]): packages list to remove
+        """
+        self._spawn_process("package-remove", *packages)
+
+    def packages_update(self, ) -> None:
+        """
+        run full repository update
+        """
+        self._spawn_process("repo-update")
+
     def run(self) -> None:
         """
         thread run method
@@ -174,3 +174,9 @@ class Spawn(Thread, LazyLogging):
             if process is not None:
                 process.terminate()  # make sure lol
                 process.join()
+
+    def stop(self) -> None:
+        """
+        gracefully terminate thread
+        """
+        self.queue.put(None)

src/ahriman/web/web.py

@@ -115,7 +115,7 @@ def run_server(application: web.Application) -> None:
     port = configuration.getint("web", "port")
     unix_socket = create_socket(configuration, application)
 
-    web.run_app(application, host=host, port=port, sock=unix_socket, handle_signals=False,
+    web.run_app(application, host=host, port=port, sock=unix_socket, handle_signals=True,
                 access_log=logging.getLogger("http"), access_log_class=FilteredAccessLogger)