Move WS code outside the main into swiftstory.interface.ws.py

Also, the GameManager object is not created globally anymore when
importing the module.

Signed-off-by: Olivier Gayot <olivier.gayot@sigexec.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/swiftstory/interface/__init__.py b/swiftstory/interface/__init__.py
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/swiftstory/interface/__init__.py
diff --git a/swiftstory/interface/ws.py b/swiftstory/interface/ws.py
new file mode 100644
index 0000000..d63e71c
--- /dev/null
+++ b/swiftstory/interface/ws.py
@@ -0,0 +1,80 @@
+import asyncio
+import contextlib
+import json
+import logging
+
+import websockets.exceptions
+from websockets.server import WebSocketServerProtocol
+
+from swiftstory.client import Client
+from swiftstory.exception import WrongAction, JoinError
+from swiftstory.game_manager import GameManager
+from swiftstory.status import error
+
+
+class WebsocketsInterface:
+    """ Interface with WebSockets for SwiftStory. """
+    def __init__(self, game_manager: GameManager):
+        self.game_manager = game_manager
+
+    async def connection_handler(self, websocket: WebSocketServerProtocol, path: str):
+        client = Client(websocket, self.game_manager)
+
+        with contextlib.suppress(websockets.exceptions.ConnectionClosed):
+            async for message in client.socket:
+                await client.socket.send(self.message_received_handler(client, message))
+
+        client.disconnect()
+
+    def message_received_handler(self, client, message):
+        def join_game():
+            try:
+                game_name = json_msg['game_name']
+            except KeyError:
+                return error('field `game_name\' is required')
+            else:
+                lang = json_msg.get('lang')
+                return client.join_game(game_name, lang)
+
+        def designate_card():
+            card_id = None
+            try:
+                card_id = int(json_msg['card_id'])
+            except (KeyError, TypeError):
+                pass
+            finally:
+                return client.designate_card(card_id)
+
+        def play_white_card():
+            try:
+                card_id = int(json_msg['card_id'])
+            except KeyError:
+                return error('field `card_id\' is required')
+            else:
+                return client.play_white_card(card_id)
+
+        opcodes_map = {
+            "join_game": join_game,
+            "view_player_cards": lambda: client.view_player_cards(),
+            "view_black_card": lambda: client.view_black_card(),
+            "view_played_cards": lambda: client.view_played_cards(),
+            "pick_black_card": lambda: client.pick_black_card(),
+            "collect_cards": lambda: client.collect_cards(),
+            "designate_card": designate_card,
+            "play_white_card": play_white_card,
+            }
+
+        try:
+            json_msg = json.loads(message)
+        except json.JSONDecodeError:
+            return error('badly formatted json')
+
+        try:
+            return opcodes_map[json_msg["op"]]()
+        except (KeyError, TypeError):
+            return error('invalid command')
+        except WrongAction as e:
+            return error(str(e))
+        except JoinError as e:
+            logging.warning("player could not join game: %s", e.__repr__())
+            return error(str(e))