MultiServer, customserver, CI, Test: Fix problems in room hosting and…

… test/simulate it (ArchipelagoMW#3464)

* Test: add hosting simulation test

* WebHost: add weak typing to get_app()

* MultiServer: add typing to auto_saver_thread

* MultiServer: don't cancel task, properly end it

* customserver: stop auto-save thread from saving after shutdown

and make sure it stops, another potential memory leak

* MultiServer, customserver: make datapackage small again

* customserver: collect/finish room tasks

Hopefully fixes the memory leak we are seeing

* CI: test hosting

* Test: hosting: verify autohoster saves on Ctrl+C

* customserver: save when stopping via Ctrl+C

.github/workflows/unittests.yml

@@ -24,7 +24,7 @@ on:
       - '.github/workflows/unittests.yml'
 
 jobs:
-  build:
+  unit:
     runs-on: ${{ matrix.os }}
     name: Test Python ${{ matrix.python.version }} ${{ matrix.os }}
 
@@ -60,3 +60,32 @@ jobs:
     - name: Unittests
       run: |
         pytest -n auto
+
+  hosting:
+    runs-on: ${{ matrix.os }}
+    name: Test hosting with ${{ matrix.python.version }} on ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os:
+          - ubuntu-latest
+        python:
+          - {version: '3.11'}  # current
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python ${{ matrix.python.version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python.version }}
+    - name: Install dependencies
+      run: |
+        python -m venv venv
+        source venv/bin/activate
+        python -m pip install --upgrade pip
+        python ModuleUpdate.py --yes --force --append "WebHostLib/requirements.txt"
+    - name: Test hosting
+      run: |
+        source venv/bin/activate
+        export PYTHONPATH=$(pwd)
+        python test/hosting/__main__.py

MultiServer.py

@@ -3,6 +3,7 @@
 import argparse
 import asyncio
 import collections
+import contextlib
 import copy
 import datetime
 import functools
@@ -176,7 +177,7 @@ class Context:
     location_name_groups: typing.Dict[str, typing.Dict[str, typing.Set[str]]]
     all_item_and_group_names: typing.Dict[str, typing.Set[str]]
     all_location_and_group_names: typing.Dict[str, typing.Set[str]]
-    non_hintable_names: typing.Dict[str, typing.Set[str]]
+    non_hintable_names: typing.Dict[str, typing.AbstractSet[str]]
     spheres: typing.List[typing.Dict[int, typing.Set[int]]]
     """ each sphere is { player: { location_id, ... } } """
     logger: logging.Logger
@@ -231,7 +232,7 @@ def __init__(self, host: str, port: int, server_password: str, password: str, lo
         self.embedded_blacklist = {"host", "port"}
         self.client_ids: typing.Dict[typing.Tuple[int, int], datetime.datetime] = {}
         self.auto_save_interval = 60  # in seconds
-        self.auto_saver_thread = None
+        self.auto_saver_thread: typing.Optional[threading.Thread] = None
         self.save_dirty = False
         self.tags = ['AP']
         self.games: typing.Dict[int, str] = {}
@@ -268,6 +269,11 @@ def _load_game_data(self):
         for world_name, world in worlds.AutoWorldRegister.world_types.items():
             self.non_hintable_names[world_name] = world.hint_blacklist
 
+        for game_package in self.gamespackage.values():
+            # remove groups from data sent to clients
+            del game_package["item_name_groups"]
+            del game_package["location_name_groups"]
+
     def _init_game_data(self):
         for game_name, game_package in self.gamespackage.items():
             if "checksum" in game_package:
@@ -1926,8 +1932,6 @@ def _cmd_status(self, tag: str = "") -> bool:
     def _cmd_exit(self) -> bool:
         """Shutdown the server"""
         self.ctx.server.ws_server.close()
-        if self.ctx.shutdown_task:
-            self.ctx.shutdown_task.cancel()
         self.ctx.exit_event.set()
         return True
 
@@ -2286,7 +2290,8 @@ def parse_args() -> argparse.Namespace:
 
 
 async def auto_shutdown(ctx, to_cancel=None):
-    await asyncio.sleep(ctx.auto_shutdown)
+    with contextlib.suppress(asyncio.TimeoutError):
+        await asyncio.wait_for(ctx.exit_event.wait(), ctx.auto_shutdown)
 
     def inactivity_shutdown():
         ctx.server.ws_server.close()
@@ -2306,7 +2311,8 @@ def inactivity_shutdown():
             if seconds < 0:
                 inactivity_shutdown()
             else:
-                await asyncio.sleep(seconds)
+                with contextlib.suppress(asyncio.TimeoutError):
+                    await asyncio.wait_for(ctx.exit_event.wait(), seconds)
 
 
 def load_server_cert(path: str, cert_key: typing.Optional[str]) -> "ssl.SSLContext":

WebHost.py

@@ -12,14 +12,17 @@
 import Utils
 import settings
 
+if typing.TYPE_CHECKING:
+    from flask import Flask
+
 Utils.local_path.cached_path = os.path.dirname(__file__) or "."  # py3.8 is not abs. remove "." when dropping 3.8
 settings.no_gui = True
 configpath = os.path.abspath("config.yaml")
 if not os.path.exists(configpath):  # fall back to config.yaml in home
     configpath = os.path.abspath(Utils.user_path('config.yaml'))
 
 
-def get_app():
+def get_app() -> "Flask":
     from WebHostLib import register, cache, app as raw_app
     from WebHostLib.models import db
 

WebHostLib/customserver.py

@@ -168,17 +168,28 @@ def get_random_port():
 def get_static_server_data() -> dict:
     import worlds
     data = {
-        "non_hintable_names": {},
-        "gamespackage": worlds.network_data_package["games"],
-        "item_name_groups": {world_name: world.item_name_groups for world_name, world in
-                             worlds.AutoWorldRegister.world_types.items()},
-        "location_name_groups": {world_name: world.location_name_groups for world_name, world in
-                                 worlds.AutoWorldRegister.world_types.items()},
+        "non_hintable_names": {
+            world_name: world.hint_blacklist
+            for world_name, world in worlds.AutoWorldRegister.world_types.items()
+        },
+        "gamespackage": {
+            world_name: {
+                key: value
+                for key, value in game_package.items()
+                if key not in ("item_name_groups", "location_name_groups")
+            }
+            for world_name, game_package in worlds.network_data_package["games"].items()
+        },
+        "item_name_groups": {
+            world_name: world.item_name_groups
+            for world_name, world in worlds.AutoWorldRegister.world_types.items()
+        },
+        "location_name_groups": {
+            world_name: world.location_name_groups
+            for world_name, world in worlds.AutoWorldRegister.world_types.items()
+        },
     }
 
-    for world_name, world in worlds.AutoWorldRegister.world_types.items():
-        data["non_hintable_names"][world_name] = world.hint_blacklist
-
     return data
 
 
@@ -266,12 +277,15 @@ async def start_room(room_id):
                     ctx.logger.exception("Could not determine port. Likely hosting failure.")
                 with db_session:
                     ctx.auto_shutdown = Room.get(id=room_id).timeout
+                if ctx.saving:
+                    setattr(asyncio.current_task(), "save", lambda: ctx._save(True))
                 ctx.shutdown_task = asyncio.create_task(auto_shutdown(ctx, []))
                 await ctx.shutdown_task
 
             except (KeyboardInterrupt, SystemExit):
                 if ctx.saving:
                     ctx._save()
+                    setattr(asyncio.current_task(), "save", None)
             except Exception as e:
                 with db_session:
                     room = Room.get(id=room_id)
@@ -281,8 +295,12 @@ async def start_room(room_id):
             else:
                 if ctx.saving:
                     ctx._save()
+                    setattr(asyncio.current_task(), "save", None)
             finally:
                 try:
+                    ctx.save_dirty = False  # make sure the saving thread does not write to DB after final wakeup
+                    ctx.exit_event.set()  # make sure the saving thread stops at some point
+                    # NOTE: async saving should probably be an async task and could be merged with shutdown_task
                     with (db_session):
                         # ensure the Room does not spin up again on its own, minute of safety buffer
                         room = Room.get(id=room_id)
@@ -294,13 +312,32 @@ async def start_room(room_id):
                     rooms_shutting_down.put(room_id)
 
     class Starter(threading.Thread):
+        _tasks: typing.List[asyncio.Future]
+
+        def __init__(self):
+            super().__init__()
+            self._tasks = []
+
+        def _done(self, task: asyncio.Future):
+            self._tasks.remove(task)
+            task.result()
+
         def run(self):
             while 1:
                 next_room = rooms_to_run.get(block=True,  timeout=None)
-                asyncio.run_coroutine_threadsafe(start_room(next_room), loop)
+                task = asyncio.run_coroutine_threadsafe(start_room(next_room), loop)
+                self._tasks.append(task)
+                task.add_done_callback(self._done)
                 logging.info(f"Starting room {next_room} on {name}.")
 
     starter = Starter()
     starter.daemon = True
     starter.start()
-    loop.run_forever()
+    try:
+        loop.run_forever()
+    finally:
+        # save all tasks that want to be saved during shutdown
+        for task in asyncio.all_tasks(loop):
+            save: typing.Optional[typing.Callable[[], typing.Any]] = getattr(task, "save", None)
+            if save:
+                save()