Config refactor part 3

build_server.py

@@ -1,48 +1,25 @@
-import os
+"""
+    This module prepares the necessary files for running the server in the
+    correct configuration.
+"""
+
 import config
 
-def rewriter(file_name):
-    """Create a decorator that rewrites a file based on given settings."""
-
-    def exec(func):
-        """Rewrite a file"""
-        new_lines = []
-
-        info_to_remember = {}
-        line_no = 0
-
-        with open(file_name, 'r', encoding='utf-8') as open_file:
-            for line in open_file:
-                line_no += 1
-                new_line = func(line, line_no, data=info_to_remember)
-                new_lines.append(new_line)
-        
-        with open(file_name, 'w', encoding='utf-8') as write_file:
-            for line in new_lines:
-                write_file.write(line)
-    return exec
-
-@rewriter('eula.txt')
-def confirm_eula(line : str, line_no : int, data):
-    """Confirm the Minecraft EULA"""
-    if not config.EULA:
-        return line
+def write_eula():
+    """
+        Write whether the user accepts to Minecraft's EULA.
+        The server refuses to run unless explicitly accepted.
+    """
+    with open("eula.txt", 'w') as fp:
+        if config.EULA == True:
+            fp.write("eula=true")
         else:
-        return line.replace('eula=false', 'eula=true')
+            fp.write("eula=false")
 
-@rewriter('server.properties')
-def fill_in_server_settings(line : str, line_no : int, data):
-    """Set up the server based on our chosen properties"""
-    if line.strip().startswith('#'):
-        return line
-    
-    key = line.split('=')[0]
-
-    server_settings = config.at(['minecraft']) or {}
-
-    try:
-        value = server_settings[key]
-    except IndexError:
-        return line
-    else:
-        return key + '=' + str(value) + '\n'
+def write_server_properties():
+    """
+        Write the configuration for the Minecraft world.
+    """
+    with open("server.properties", 'w') as fp:
+        for key, value in config.at(['minecraft']).items():
+            fp.write(f"{key}={value}\n")

config.py

@@ -1,6 +1,9 @@
-import os
-import yaml
+"""
+    This module loads and parses the config.yaml file.
+"""
+
 from typing import Any, List, Optional
+import yaml
 
 with open('config.yaml', 'r') as open_file:
     SETTINGS = yaml.load(open_file)
@@ -27,7 +30,7 @@ def at_value(keys : List[str], value : Any) -> Optional[Any]:
             return at_value(tail, new_value)
 
 # EULA
-EULA = at(['minecraft', 'eula']) or False
+EULA = at(['config', 'eula']) or False
 
 # Minecraft bridge credentials
 MATRIX_HOMESERVER = at(['matrix', 'homeserver']) or "https://matrix.example.org/"
@@ -37,6 +40,23 @@ 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'
+SERVER_IP = at(['matrix', 'server_address']) or 'unknown ip'
 
 MATRIX_ADMINS = at(['matrix', 'mc-admins']) or []
+
+try:
+    RAM_SIZE = int(at(['config', 'ram']))
+except TypeError:
+    RAM_SIZE = 1024
+except ValueError:
+    RAM_SIZE = 1024
+
+SERVER_JAR_LOCATION = at(['config', 'server_jar']) or 'server.jar'
+
+RUN_COMMAND = [
+    'java', 
+    f'-Xmx{RAM_SIZE}M', 
+    f'-Xms{RAM_SIZE}M', 
+    '-jar', SERVER_JAR_LOCATION, 
+    'nogui'
+]

config.yaml

@@ -7,6 +7,10 @@ config:
   # To be downloaded at: https://www.minecraft.net/en-us/download/server
   server_jar: server.jar
 
+  # Confirm the Minecraft EULA. https://account.mojang.com/documents/minecraft_eula
+  # Defaults to false, but is required to run the server.
+  # eula: true
+
 # Matrix bridge configurations
 matrix:
   # Homeserver URL
@@ -45,8 +49,6 @@ matrix:
 
 # Settings that directly affect running the Minecraft server.
 minecraft:
-  # Confirm the Minecraft EULA. Defaults to false.
-  # eula: true
 
   # --------------------
   # MINECRAFT SERVER

mc_wrapper.py

@@ -2,13 +2,17 @@ from subprocess import Popen, PIPE
 from typing import Union
 import asyncio
 import json
-import sys
 import re
 from nbsr import NonBlockingStreamReader as NBSR
 import config
+import build_server as build
+
+# Write the appropriate files
+build.write_eula()
+build.write_server_properties()
 
 # run the shell as a subprocess:
-p = Popen(sys.argv[1:],
+p = Popen(config.RUN_COMMAND,
         stdin = PIPE, stdout = PIPE, stderr = PIPE, shell = False)
 # wrap p.stdout with a NonBlockingStreamReader object:
 nbsr = NBSR(p.stdout)