fix: site/ structure (no Procfile)

2026-07-21 17:50:23 +04:00
parent f375304e3f
commit 8912ecbdfb
3 changed files with 4 additions and 5 deletions
@@ -0,0 +1,184 @@
+"""
+IoT Consumer — Flask app that reads IoT events from Kafka (TLS + SASL)
+and inserts them into ClickHouse.
+
+Env vars (set by Terraform):
+  KAFKA_BROKERS     — bootstrap server (host:port)
+  KAFKA_TOPIC       — topic name
+  KAFKA_USERNAME    — SASL username
+  KAFKA_PASSWORD    — SASL password
+  KAFKA_CA_CRT      — CA certificate (PEM)
+  KAFKA_USER_CRT    — user certificate (PEM)
+  KAFKA_USER_KEY    — user private key (PEM)
+  KAFKA_GROUP_ID    — consumer group id
+  CH_HOST           — ClickHouse host
+  CH_PORT           — ClickHouse port (default 8123)
+  CH_USER           — ClickHouse user
+  CH_PASSWORD       — ClickHouse password
+  CH_DATABASE       — ClickHouse database name
+"""
+
+import json
+import os
+import tempfile
+import threading
+
+from flask import Flask, jsonify
+from kafka import KafkaConsumer
+import clickhouse_connect
+
+app = Flask(__name__)
+
+# --- Config ---
+KAFKA_BROKERS = os.environ["KAFKA_BROKERS"]
+KAFKA_TOPIC = os.environ["KAFKA_TOPIC"]
+KAFKA_USERNAME = os.environ["KAFKA_USERNAME"]
+KAFKA_PASSWORD = os.environ["KAFKA_PASSWORD"]
+KAFKA_CA_CRT = os.environ.get("KAFKA_CA_CRT", "")
+KAFKA_USER_CRT = os.environ.get("KAFKA_USER_CRT", "")
+KAFKA_USER_KEY = os.environ.get("KAFKA_USER_KEY", "")
+KAFKA_GROUP_ID = os.environ.get("KAFKA_GROUP_ID", "iot-consumer-group")
+
+CH_HOST = os.environ["CH_HOST"]
+CH_PORT = int(os.environ.get("CH_PORT", 8123))
+CH_USER = os.environ["CH_USER"]
+CH_PASSWORD = os.environ["CH_PASSWORD"]
+CH_DATABASE = os.environ["CH_DATABASE"]
+
+# --- TLS certs → temp files ---
+_cert_dir = tempfile.mkdtemp(prefix="kafka-certs-")
+
+def _write_cert(name, content):
+    if not content:
+        return None
+    path = os.path.join(_cert_dir, name)
+    with open(path, "w") as f:
+        f.write(content)
+    return path
+
+_ca_file = _write_cert("ca.crt", KAFKA_CA_CRT)
+_cert_file = _write_cert("user.crt", KAFKA_USER_CRT)
+_key_file = _write_cert("user.key", KAFKA_USER_KEY)
+
+events_consumed = 0
+errors_count = 0
+ch_client = None
+
+
+def get_ch_client():
+    global ch_client
+    if ch_client is None:
+        ch_client = clickhouse_connect.get_client(
+            host=CH_HOST,
+            port=CH_PORT,
+            username=CH_USER,
+            password=CH_PASSWORD,
+            database=CH_DATABASE,
+        )
+        ch_client.command("""
+            CREATE TABLE IF NOT EXISTS iot_events (
+                event_id String,
+                sensor_id String,
+                device_type String,
+                location String,
+                value Float64,
+                unit String,
+                timestamp DateTime64(3)
+            ) ENGINE = MergeTree()
+            ORDER BY (timestamp, sensor_id)
+        """)
+        print("[CONSUMER] ClickHouse table ready")
+    return ch_client
+
+
+def insert_batch(events):
+    if not events:
+        return
+    rows = [[
+        e["event_id"],
+        e["sensor_id"],
+        e["device_type"],
+        e["location"],
+        e["value"],
+        e["unit"],
+        e["timestamp"],
+    ] for e in events]
+    try:
+        client = get_ch_client()
+        client.insert("iot_events", rows,
+            column_names=["event_id", "sensor_id", "device_type", "location", "value", "unit", "timestamp"])
+    except Exception as e:
+        print(f"[CONSUMER] Insert error: {e}")
+        raise
+
+
+def consume_loop():
+    global events_consumed, errors_count
+
+    kwargs = {
+        "bootstrap_servers": KAFKA_BROKERS,
+        "security_protocol": "SASL_SSL",
+        "sasl_mechanism": "PLAIN",
+        "sasl_plain_username": KAFKA_USERNAME,
+        "sasl_plain_password": KAFKA_PASSWORD,
+        "group_id": KAFKA_GROUP_ID,
+        "auto_offset_reset": "earliest",
+        "value_deserializer": lambda m: json.loads(m.decode("utf-8")),
+        "max_poll_records": 20,
+    }
+    if _ca_file:
+        kwargs["ssl_cafile"] = _ca_file
+    if _cert_file:
+        kwargs["ssl_certfile"] = _cert_file
+    if _key_file:
+        kwargs["ssl_keyfile"] = _key_file
+    kwargs["ssl_check_hostname"] = False
+
+    consumer = KafkaConsumer(KAFKA_TOPIC, **kwargs)
+
+    print(f"[CONSUMER] Listening on topic '{KAFKA_TOPIC}'...")
+
+    batch = []
+    for message in consumer:
+        try:
+            event = message.value
+            batch.append(event)
+            events_consumed += 1
+
+            if len(batch) >= 10:
+                insert_batch(batch)
+                print(f"[CONSUMER] Inserted {len(batch)} events into ClickHouse")
+                batch = []
+        except Exception as e:
+            errors_count += 1
+            print(f"[CONSUMER] Error: {e}")
+
+
+@app.route("/")
+def index():
+    query = "SELECT count() FROM iot_events"
+    try:
+        client = get_ch_client()
+        total = client.query(query).result_rows[0][0]
+    except Exception:
+        total = 0
+
+    return jsonify({
+        "service": "iot-consumer",
+        "status": "running",
+        "kafka_topic": KAFKA_TOPIC,
+        "events_consumed": events_consumed,
+        "events_in_db": total,
+        "errors": errors_count,
+    })
+
+
+@app.route("/health")
+def health():
+    return jsonify({"status": "ok", "events_consumed": events_consumed})
+
+
+if __name__ == "__main__":
+    threading.Thread(target=consume_loop, daemon=True).start()
+    port = int(os.environ.get("PORT", 5000))
+    app.run(host="0.0.0.0", port=port)