Init

Makefile

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+run:
+	bash -c 'nohup python3 main.py >nohup.out 2>&1 & disown'

main.py

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+import os
+import sys
+import socket
+import time
+import subprocess
+
+CHECK_USERS_CMD = ["/root/mcrcon/mcrcon", "-H", "192.168.0.21", "-p", "password", "list"]
+CHECK_INTERVAL = 60
+WASTED_LIMIT = 20 * 60
+
+def are_users_there():
+    try:
+        output = subprocess.check_output(CHECK_USERS_CMD)
+    # Maybe, server isn't running?
+    except subprocess.CalledProcessError as err:
+        print(f"Cannot access mcrcon: {err}", flush=True)
+        return True
+    header = output.decode().split("\n")[0]
+    if header.startswith("There are 0 of"):
+        return False
+    return True
+
+def server_shutdown():
+    subprocess.run("service minecraft stop".split(" "))
+
+def server_startup():
+    subprocess.run("service minecraft start".split(" "))
+
+def main():
+    wasted_cnt_seconds = 0
+    while True:
+        if are_users_there():
+            wasted_cnt_seconds = 0
+            print("Users ok", flush=True)
+            time.sleep(CHECK_INTERVAL)
+            continue
+
+        wasted_cnt_seconds += CHECK_INTERVAL
+        print(f"No users ({wasted_cnt_seconds})", flush=True)
+        if wasted_cnt_seconds > WASTED_LIMIT:
+            print("Wasted limit", flush=True)
+            server_shutdown()
+            wait_client()
+            server_startup()
+            print("Server started", flush=True)
+            wasted_cnt_seconds = 0
+
+        time.sleep(CHECK_INTERVAL)
+
+def wait_client():
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    sock.bind(("0.0.0.0", 25565))
+    print("Listening...", flush=True)
+    sock.listen(0)
+    connection, address = sock.accept()
+    print(f"Connection from: {address}", flush=True)
+    connection.close()
+    sock.close()
+
+if __name__ == '__main__':
+    main()