Config refactor

Refactor the config away from environment variables to one YAML file that is relatively easy to edit as a Docker container volume.

build_server.py

@@ -25,7 +25,7 @@ def rewriter(file_name):
 @rewriter('eula.txt')
 def confirm_eula(line : str, line_no : int, data):
     """Confirm the Minecraft EULA"""
-    if os.getenv('EULA') is None or os.getenv('EULA').lower() != 'true':
+    if not config.EULA:
         return line
     else:
         return line.replace('eula=false', 'eula=true')
@@ -36,9 +36,13 @@ def fill_in_server_settings(line : str, line_no : int, data):
     if line.strip().startswith('#'):
         return line
     
-    value = line.split('=')[0]
+    key = line.split('=')[0]
 
-    if value in config.SERVER_SETTINGS:
-        return value + '=' + str(config.SERVER_SETTINGS[value]) + '\n'
-    else:
+    server_settings = config.at(['minecraft']) or {}
+
+    try:
+        value = server_settings[key]
+    except IndexError:
         return line
+    else:
+        return key + '=' + str(value) + '\n'

config.py

@@ -1,9 +1,41 @@
 import os
+import yaml
+from typing import Any, List, Optional
+
+with open('config.yaml', 'r') as open_file:
+    SETTINGS = yaml.load(open_file)
+
+def at(keys : List[str]) -> Optional[Any]:
+    """
+        Potentially get a value. If it doesn't exist, return None.
+    """
+    return at_value(keys, SETTINGS)
+
+def at_value(keys : List[str], value : Any) -> Optional[Any]:
+    try:
+        head, tail = keys[0], keys[1:]
+    except IndexError:
+        return value
+    else:
+        try:
+            new_value = value[head]
+        except TypeError:
+            return None
+        except KeyError:
+            return None
+        else:
+            return at_value(tail, new_value)
+
+# EULA
+EULA = at(['minecraft', 'eula']) or False
 
 # Minecraft bridge credentials
-MATRIX_HOMESERVER = os.getenv('MATRIX_HOMESERVER')  or "https://homeserv.er"
-MATRIX_USERNAME   = os.getenv('MATRIX_USERNAME')    or "@bridge_username:homeserv.er"
-MATRIX_PASSWORD   = os.getenv('MATRIX_PASSWORD')    or "bridge_password"
+MATRIX_HOMESERVER = at(['matrix', 'homeserver']) or "https://matrix.example.org/"
+MATRIX_USERNAME   = at(['matrix', 'username'])   or "@alice:example.org"
+MATRIX_PASSWORD   = at(['matrix', 'password'])   or "bridge_password"
+
+# Matrix bridge room
+MATRIX_ROOM = at(['matrix', 'room_id']) or "!channel_id:example.org"
 
 SERVER_IP = os.getenv('SERVER_ADDRESS') or 'unknown ip'
 
@@ -16,9 +48,6 @@ MC_ADMINS = [
 if os.getenv('MATRIX_ADMINS') is not None:
     MC_ADMINS = os.getenv('MATRIX_ADMINS').split(',')
 
-# Matrix channel that the bot should talk to
-MC_CHANNEL = os.getenv('MC_CHANNEL') or "!channel_id:homeserv.er"
-
 make_bool = lambda os_value, default_value : default_value if not os_value else (
     False if os_value.lower() == 'false' else True
 )

config.yaml

@@ -10,6 +10,9 @@ matrix:
   # Matrix room
   room_id: "!channel_id:example.org"
 
+  # IP address or domain where users can join the server
+  server_address: unknown ip
+
   # List of Matrix users that can send commands to the bridge.
   # When a message starts with a slash, (/) the bridge will interpret it as a
   # Minecraft command and will put that as a command into the console.

main.py

@@ -13,7 +13,7 @@ STARTUP_TIME = time.time()
 client = AsyncClient(config.MATRIX_HOMESERVER, config.MATRIX_USERNAME)
 
 async def message_callback(room: MatrixRoom, event: RoomMessageText) -> None:
-    if room.machine_name != config.MC_CHANNEL:
+    if room.machine_name != config.MATRIX_ROOM:
         return
     if event.sender == client.user_id:
         return