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q1-deploy-monitor/app/main.py

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+"""
+Simple Python API service.
+Exposes:
+  GET /            -> basic info
+  GET /health       -> liveness/readiness probe
+  GET /metrics      -> runtime metrics consumed by the monitoring dashboard
+"""
+
+import os
+import time
+import threading
+from datetime import datetime, timezone
+
+from flask import Flask, jsonify
+
+app = Flask(__name__)
+
+START_TIME = time.time()
+
+# --- In-memory metrics (thread-safe) --------------------------------------
+_lock = threading.Lock()
+_metrics = {
+    "requests_total": 0,
+    "total_response_time_ms": 0.0,
+}
+
+
+@app.before_request
+def _start_timer():
+    from flask import g
+    g.start_time = time.perf_counter()
+
+
+@app.after_request
+def _record_metrics(response):
+    from flask import g
+    elapsed_ms = (time.perf_counter() - getattr(g, "start_time", time.perf_counter())) * 1000
+    with _lock:
+        _metrics["requests_total"] += 1
+        _metrics["total_response_time_ms"] += elapsed_ms
+    # Allow the standalone dashboard.html to call this API from any origin
+    response.headers["Access-Control-Allow-Origin"] = "*"
+    return response
+
+
+@app.route("/")
+def index():
+    return jsonify({
+        "service": "sample-api",
+        "message": "API is running. See /health and /metrics."
+    })
+
+
+@app.route("/health")
+def health():
+    """Used by the container platform's health checks and the monitor.py script."""
+    return jsonify({
+        "status": "healthy",
+        "timestamp": datetime.now(timezone.utc).isoformat(),
+        "uptime_seconds": round(time.time() - START_TIME, 2),
+    }), 200
+
+
+@app.route("/metrics")
+def metrics():
+    """Used by dashboard.html to render live stats."""
+    with _lock:
+        total = _metrics["requests_total"]
+        total_time = _metrics["total_response_time_ms"]
+    avg_ms = round(total_time / total, 2) if total else 0.0
+
+    return jsonify({
+        "status": "healthy",
+        "uptime_seconds": round(time.time() - START_TIME, 2),
+        "requests_total": total,
+        "avg_response_time_ms": avg_ms,
+        "timestamp": datetime.now(timezone.utc).isoformat(),
+    })
+
+
+if __name__ == "__main__":
+    port = int(os.environ.get("PORT", 8080))
+    app.run(host="0.0.0.0", port=port)