Add issuer watchdog

Author: gfour

scripts/watchdog.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python3
+
+import argparse
+import requests
+import time
+import urllib3
+from subprocess import Popen
+
+urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
+
+DEFAULT_HOST = "https://snf-74864.ok-kno.grnetcloud.net:5000"
+DEFAULT_TIMEOUT = 5
+
+proc = None
+
+def restart():
+    if proc is not None:
+        print("Terminating stuck server...")
+        try:
+            proc.terminate()
+        except Exception as e:
+            print(f"Error terminating server: {e}")
+    print("Restarting server...")
+    proc = Popen(["./run-issuer.sh"])
+    print("Server restarted.")
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(description="Monitor server function")
+    parser.add_argument(
+        "--host",
+        type=str,
+        required=False,
+        default=DEFAULT_HOST,
+        help=f"URL to watch for changes, default: {DEFAULT_HOST}",
+    )
+    parser.add_argument(
+        "--timeout",
+        type=int,
+        required=False,
+        default=DEFAULT_TIMEOUT,
+        help=f"The timeout to use, default: {DEFAULT_TIMEOUT}",
+    )
+    args = parser.parse_args()
+
+    url = f"{args.host}/.well-known/openid-credential-issuer"
+    print(f"Watching {url} for changes (every {DEFAULT_TIMEOUT}s)...")
+
+    while True:
+        try:
+            response = requests.get(url, timeout=args.timeout, verify=False)
+            response.raise_for_status()
+        except requests.exceptions.Timeout:
+            print("Request timed out.")
+            restart()
+        except requests.exceptions.RequestException as e:
+            print(f"An error occurred: {e}")
+            restart()
+        time.sleep(DEFAULT_TIMEOUT)
+