Fix asyncio.as_completed not cancelling its tasks

twitch.py

@@ -1458,18 +1458,21 @@ class Twitch:
             if c["status"] in applicable_statuses  # that are currently not expired
         }
         # fetch detailed data for each campaign, in chunks
-        # specifically use an intermediate list per a Python bug
-        # https://github.com/python/cpython/issues/88342
         status_update(_("gui", "status", "fetching_campaigns"))
-        for chunk_coro in asyncio.as_completed(
-            [
-                self.fetch_campaigns(campaigns_chunk)
-                for campaigns_chunk in chunk(available_campaigns.items(), 20)
-            ]
-        ):
-            chunk_campaigns_data = await chunk_coro
-            # merge the inventory and campaigns datas together
-            inventory_data = self._merge_data(inventory_data, chunk_campaigns_data)
+        fetch_campaigns_tasks: list[asyncio.Task[Any]] = [
+            asyncio.create_task(self.fetch_campaigns(campaigns_chunk))
+            for campaigns_chunk in chunk(available_campaigns.items(), 20)
+        ]
+        try:
+            for coro in asyncio.as_completed(fetch_campaigns_tasks):
+                chunk_campaigns_data = await coro
+                # merge the inventory and campaigns datas together
+                inventory_data = self._merge_data(inventory_data, chunk_campaigns_data)
+        except Exception:
+            # asyncio.as_completed doesn't cancel tasks on errors
+            for task in fetch_campaigns_tasks:
+                task.cancel()
+            raise
 
         if self.settings.dump:
             # dump the campaigns data to the dump file
@@ -1521,20 +1524,26 @@ class Twitch:
         status_update(
             _("gui", "status", "adding_campaigns").format(counter=f"(0/{len(campaigns)})")
         )
-        for i, coro in enumerate(
-            asyncio.as_completed([
-                asyncio.create_task(self.gui.inv.add_campaign(campaign))
-                for campaign in campaigns
-            ]),
-            start=1,
-        ):
-            await coro
-            status_update(
-                _("gui", "status", "adding_campaigns").format(counter=f"({i}/{len(campaigns)})")
-            )
-            # this is needed here explicitly, because cache reads from disk don't raise this
-            if self.gui.close_requested:
-                raise ExitRequest()
+        add_campaign_tasks: list[asyncio.Task[None]] = [
+            asyncio.create_task(self.gui.inv.add_campaign(campaign))
+            for campaign in campaigns
+        ]
+        try:
+            for i, coro in enumerate(asyncio.as_completed(add_campaign_tasks), start=1):
+                await coro
+                status_update(
+                    _("gui", "status", "adding_campaigns").format(
+                        counter=f"({i}/{len(campaigns)})"
+                    )
+                )
+                # this is needed here explicitly, because cache reads from disk don't raise this
+                if self.gui.close_requested:
+                    raise ExitRequest()
+        except Exception:
+            # asyncio.as_completed doesn't cancel tasks on errors
+            for task in add_campaign_tasks:
+                task.cancel()
+            raise
         self._mnt_triggers.extend(sorted(switch_triggers))
         # trim out all triggers that we're already past
         now = datetime.now(timezone.utc)
@@ -1615,14 +1624,21 @@ class Twitch:
             # shortcut for nothing to process
             # NOTE: Have to do this here, becase "channels" can be any iterable
             return
-        for coro in asyncio.as_completed([
-            self.gql_request(stream_gql_chunk)
+        stream_gql_tasks: list[asyncio.Task[list[JsonType]]] = [
+            asyncio.create_task(self.gql_request(stream_gql_chunk))
             for stream_gql_chunk in chunk(stream_gql_ops, 20)
-        ]):
-            response_list: list[JsonType] = await coro
-            for response_json in response_list:
-                channel_data: JsonType = response_json["data"]["user"]
-                acl_streams_map[int(channel_data["id"])] = channel_data
+        ]
+        try:
+            for coro in asyncio.as_completed(stream_gql_tasks):
+                response_list: list[JsonType] = await coro
+                for response_json in response_list:
+                    channel_data: JsonType = response_json["data"]["user"]
+                    acl_streams_map[int(channel_data["id"])] = channel_data
+        except Exception:
+            # asyncio.as_completed doesn't cancel tasks on errors
+            for task in stream_gql_tasks:
+                task.cancel()
+            raise
         # for all channels with an active stream, check the available drops as well
         acl_available_drops_map: dict[int, list[JsonType]] = {}
         available_gql_ops: list[GQLOperation] = [
@@ -1630,16 +1646,23 @@ class Twitch:
             for channel_id, channel_data in acl_streams_map.items()
             if channel_data["stream"] is not None  # only do this for ONLINE channels
         ]
-        for coro in asyncio.as_completed([
-            self.gql_request(available_gql_chunk)
+        available_gql_tasks: list[asyncio.Task[list[JsonType]]] = [
+            asyncio.create_task(self.gql_request(available_gql_chunk))
             for available_gql_chunk in chunk(available_gql_ops, 20)
-        ]):
-            response_list = await coro
-            for response_json in response_list:
-                available_info: JsonType = response_json["data"]["channel"]
-                acl_available_drops_map[int(available_info["id"])] = (
-                    available_info["viewerDropCampaigns"] or []
-                )
+        ]
+        try:
+            for coro in asyncio.as_completed(available_gql_tasks):
+                response_list = await coro
+                for response_json in response_list:
+                    available_info: JsonType = response_json["data"]["channel"]
+                    acl_available_drops_map[int(available_info["id"])] = (
+                        available_info["viewerDropCampaigns"] or []
+                    )
+        except Exception:
+            # asyncio.as_completed doesn't cancel tasks on errors
+            for task in available_gql_tasks:
+                task.cancel()
+            raise
         for channel in channels:
             channel_id = channel.id
             if channel_id not in acl_streams_map: