Changed ProcessController to handle Server as child subprocess

controllers.py

@@ -1,70 +1,56 @@
 import shlex
 from collections import deque
-from os import setsid
 from pathlib import Path
 from subprocess import PIPE, Popen
 from time import sleep
-from typing import Generator
+from typing import Generator, Literal
 
 from mcrcon import MCRcon
 from mcstatus import JavaServer
-from psutil import NoSuchProcess, Process
 
-from .classes import ServerStatus
+from .classes import ProcessStatus, ServerStatus
 from .config import Config
 
 
 class ProcessController:
     def __init__(self):
-        self.pid_file: Path = Path(Config.PID_FILE)
         self.start_command: list[str] = shlex.split(Config.START_COMMAND)
-        self.process: Process | None = None
-
-        if self.pid_file.is_file():
-            pid = int(self.pid_file.read_text())
-            if self._is_pid_alive(pid):
-                self.process = Process(pid)
-            else:
-                self.pid_file.unlink()
+        self.process: Popen | None = None
+        self.last_status: Literal[ProcessStatus.STOPPED, ProcessStatus.CRASHED] = (
+            ProcessStatus.STOPPED
+        )
 
     def start(self) -> None:
-        "Starts the process."
-        if self.is_started():
+        "Start the process."
+        if self.status() == ProcessStatus.RUNNING:
             return
 
-        process = Popen(
+        self.process = Popen(
             self.start_command,
             stdout=PIPE,
             stderr=PIPE,
-            preexec_fn=setsid,
         )
-        self.process = Process(process.pid)
-        self.pid_file.write_text(str(self.process.pid))
 
-    def is_started(self) -> bool:
-        "Check if the process is running."
-        if self.process:
-            return self.process.is_running()
-        return False
-
-    def is_crashed(self) -> bool:
-        "Check if the process has crashed."
-        return False  # TODO
+    def status(self) -> ProcessStatus:
+        "Check the process' status."
+        if not self.process:
+            return self.last_status
+        match self.process.poll():
+            case None:
+                return ProcessStatus.RUNNING
+            case 0:
+                self.last_status = ProcessStatus.STOPPED
+                return ProcessStatus.STOPPED
+            case _:
+                self.last_status = ProcessStatus.CRASHED
+                return ProcessStatus.CRASHED
 
     def kill(self) -> None:
         "Kill the process."
         if self.process:
             self.process.terminate()
             self.process = None
-            self.pid_file.unlink()
-
-    def _is_pid_alive(self, pid: int) -> bool:
-        "Check if a process with the given PID is alive."
-        try:
-            p = Process(pid)
-            return p.is_running()
-        except NoSuchProcess:
-            return False
+            self.last_status = ProcessStatus.STOPPED
 
 
 class ServerController:
@@ -102,10 +88,13 @@ class ServerController:
         }
 
     def command(self, command: str) -> str:
-        self.rcon.connect()
-        output = self.rcon.command(command)
-        self.rcon.disconnect()
-        return output
+        try:
+            self.rcon.connect()
+            output = self.rcon.command(command)
+            self.rcon.disconnect()
+            return output
+        except Exception:
+            return ""
 
 
 class MaintainanceController: