Q1: deploy and monitor app

health-check.py

@@ -0,0 +1,79 @@
+#!/usr/bin/env python3
+"""
+Monitoring script for Q1 - Ghaymah SRE exam.
+Checks the deployed app's /health endpoint every 30 seconds,
+logs status + response time to a CSV file, and prints live status
+to the console.
+
+Usage:
+    python3 health-check.py https://your-app-url.ghaymah.systems
+"""
+import sys
+import time
+import csv
+import os
+from datetime import datetime, timezone
+import urllib.request
+import urllib.error
+
+CHECK_INTERVAL_SECONDS = 30
+LOG_FILE = "monitor-log.csv"
+
+
+def check_health(url: str) -> dict:
+    endpoint = url.rstrip("/") + "/health"
+    start = time.time()
+    try:
+        with urllib.request.urlopen(endpoint, timeout=10) as response:
+            elapsed_ms = round((time.time() - start) * 1000, 2)
+            status_code = response.getcode()
+            return {
+                "timestamp": datetime.now(timezone.utc).isoformat(),
+                "status": "UP" if status_code == 200 else "DEGRADED",
+                "status_code": status_code,
+                "response_time_ms": elapsed_ms,
+            }
+    except (urllib.error.URLError, urllib.error.HTTPError, TimeoutError) as e:
+        elapsed_ms = round((time.time() - start) * 1000, 2)
+        return {
+            "timestamp": datetime.now(timezone.utc).isoformat(),
+            "status": "DOWN",
+            "status_code": None,
+            "response_time_ms": elapsed_ms,
+            "error": str(e),
+        }
+
+
+def log_result(result: dict):
+    file_exists = os.path.isfile(LOG_FILE)
+    with open(LOG_FILE, "a", newline="") as f:
+        fieldnames = ["timestamp", "status", "status_code", "response_time_ms", "error"]
+        writer = csv.DictWriter(f, fieldnames=fieldnames)
+        if not file_exists:
+            writer.writeheader()
+        writer.writerow({**{"error": ""}, **result})
+
+
+def main():
+    if len(sys.argv) < 2:
+        print("Usage: python3 health-check.py <app_url>")
+        sys.exit(1)
+
+    url = sys.argv[1]
+    print(f"Monitoring {url}/health every {CHECK_INTERVAL_SECONDS}s. Logging to {LOG_FILE}. Ctrl+C to stop.")
+
+    try:
+        while True:
+            result = check_health(url)
+            log_result(result)
+            print(f"[{result['timestamp']}] {result['status']} "
+                  f"({result['response_time_ms']}ms)"
+                  + (f" - {result.get('error')}" if result.get("error") else ""))
+            time.sleep(CHECK_INTERVAL_SECONDS)
+    except KeyboardInterrupt:
+        print("\nMonitoring stopped.")
+
+
+if __name__ == "__main__":
+    main()
+