fully implemented project

app/main.py

@@ -1 +1,41 @@
-print("hello")
+import signal
+import sys
+import os
+import logger
+from server import Server
+
+def _handle_exit(sig, frame):
+    print("Exiting...")
+    sys.exit(0)
+
+def _get_environment_variable(key: str) -> str:
+    value = os.getenv(key)
+
+    if not value:
+        logger.error("Environment variable '" + key + "' must be set")
+
+    return value
+
+def _parse_environment_variable(key: str, value: str) -> int | None:
+    try:
+        return int(value)
+    except ValueError:
+        logger.error("Environment variable '" + key + "' must be an integer")
+
+def main():
+    signal.signal(signal.SIGTERM, _handle_exit)
+    signal.signal(signal.SIGINT, _handle_exit)
+
+    host = _get_environment_variable("HOST")
+    port = _get_environment_variable("PORT")
+    cache_duration = _get_environment_variable("CACHE_DURATION")
+    ics_url = _get_environment_variable("ICS_URL")
+
+    port_int = _parse_environment_variable("PORT", port)
+    cache_duration_int = _parse_environment_variable("CACHE_DURATION", cache_duration)
+
+    server = Server(host, port_int, cache_duration_int, ics_url)
+    server.serve()
+
+if __name__ == "__main__":
+    main()