progress on kafka

app.py

@@ -1,6 +1,20 @@
 from app import create_app
+from app.integrations import KafkaIntegration
 
 app = create_app()
 
 if __name__ == "__main__":
-    app.run(host="0.0.0.0", port=5000, debug=True)
+    kafka = KafkaIntegration()
+
+    if kafka.is_kafka_running():
+        print("Kafka is running")
+    else:
+        print("Kafka is not running")
+        exit(1)
+
+    try:
+        message = kafka.receive_messages(
+            topic=
+        )
+
+    app.run(host="0.0.0.0", port=5000, debug=True)

app/config.py

@@ -9,5 +9,8 @@ class Config:
     JWT_SECRET_KEY = os.getenv("JWT_SECRET_KEY", "your_jwt_secret")
     DEBUG = True
 
-    KAFKA_BROKER = "dev-events.simbrellang.net:9085"
+    KAFKA_BROKER = "dev-events.simbrellang.net:9084"
     KAFKA_PAYMENT_TOPIC = "PROCESS_PAYMENT"
+
+
+settings = Config()

app/integrations/kafka.py

@@ -1,32 +1,31 @@
-from confluent_kafka import Producer
+from confluent_kafka import Consumer
 import json
 import logging
 from app.config import settings
+import requests
 
 logger = logging.getLogger(__name__)
 
 
 class KafkaIntegration:
-    _producer = None
-    _config = {
+    _consumer = None
+
+    _consumer_config = {
         "bootstrap.servers": settings.KAFKA_BROKER,
-        "client.id": "loan-service-producer",
-        "acks": "all",
-        "retries": 3,
-        "debug": "broker,topic,msg",
+        "group.id": "loan-service-consumer",
+        "auto.offset.reset": "earliest",
+        "enable.auto.commit": True,
     }
 
     @staticmethod
-    def _get_producer():
-        """Kafka producer"""
-        if not KafkaIntegration._producer:
-            KafkaIntegration._producer = Producer(KafkaIntegration._config)
-
+    def _get_consumer():
+        """Kafka consumer"""
+        if not KafkaIntegration._consumer:
+            KafkaIntegration._consumer = Consumer(KafkaIntegration._consumer_config)
             logger.info(
-                f"Connected to Kafka broker at {KafkaIntegration._config['bootstrap.servers']}"
+                f"Consumer connected to Kafka broker at {KafkaIntegration._consumer_config['bootstrap.servers']}"
             )
-
-        return KafkaIntegration._producer
+        return KafkaIntegration._consumer
 
     @staticmethod
     def delivery_report(err, msg):
@@ -42,44 +41,76 @@ class KafkaIntegration:
             )
 
     @staticmethod
-    def send_disbursement_request(disbursement_data, request_id):
+    def receive_messages(topic, timeout=1.0):
         """
-        Send disbursement request to PROCESS_PAYMENT topic
+        Receive messages from a Kafka topic.
 
-        Args:
-            disbursement_data (dict): Disbursement data request payload
-            request_id (str): Unique request identifier (used as Kafka key)
-
-        Returns:
-            None
+        :param topic: The Kafka topic to subscribe to
+        :param timeout: Time to wait for a message (in seconds)
+        :return: The message value (decoded) or None if no message is received
         """
+        consumer = KafkaIntegration._get_consumer()
+        consumer.subscribe([topic])
+
         try:
-            # proceed to send the disbursement request to Kafka
-            producer = KafkaIntegration._get_producer()
+            msg = consumer.poll(timeout=timeout)
+            if msg is None:
+                logger.debug(f"No message received from topic {topic} within timeout")
+                return None
+            if msg.error():
+                logger.error(f"Consumer error: {msg.error()}")
+                raise RuntimeError(f"Consumer error: {msg.error()}")
 
-            # sending disbursement request to Kafka
-            producer.produce(
-                "PROCESS_PAYMENT",
-                key=str(request_id),
-                value=json.dumps(disbursement_data).encode("utf-8"),
-                callback=KafkaIntegration.delivery_report,
+            # Decode and return the message value
+            message_value = msg.value().decode("utf-8")
+            logger.debug(
+                f"Received message from {msg.topic()} [{msg.partition()}] @ offset {msg.offset()}: {message_value}"
             )
+            return json.loads(message_value) if message_value else None
 
-            producer.poll(0)
-
-            logger.info(
-                f"Disbursement request {request_id} sent to Kafka: {disbursement_data}"
-            )
         except Exception as e:
-            logger.error(
-                f"Failed to send disbursement request {str(request_id)} to Kafka: {str(e)}"
-            )
-            raise Exception(
-                f"Failed to send disbursement request {str(request_id)} to Kafka: {str(e)}"
-            )
+            logger.error(f"Error while receiving message: {e}")
+            raise
 
     @staticmethod
-    def flush():
-        """Shutdown"""
-        producer = KafkaIntegration._get_producer()
-        producer.flush()
+    def close_consumer():
+        """Shutdown consumer"""
+        consumer = KafkaIntegration._get_consumer()
+        consumer.clonse()
+        logger.info("Kafka consumer closed")
+
+    @staticmethod
+    def is_kafka_running():
+        """
+        Check if Kafka broker is reachable by attempting to fetch metadata.
+        :return: True if Kafka is running, False otherwise
+        """
+        try:
+            producer = KafkaIntegration._get_producer()
+            # Attempt to fetch metadata for a dummy topic
+            metadata = producer.list_topics(timeout=5)
+            if metadata.brokers:  # If brokers are returned, Kafka is running
+                logger.info(f"Kafka broker at {settings.KAFKA_BROKER} is running")
+                return True
+            else:
+                logger.warning(f"No brokers found for {settings.KAFKA_BROKER}")
+                return False
+        except Exception as e:
+            logger.error(f"Kafka broker check failed: {e}")
+            return False
+
+    @staticmethod
+    def _call_disbursement_endpoint(
+        message, endpoint_url="http://localhost:8000/loans/disbursement"
+    ):
+        """Call an HTTP endpoint with the received message"""
+        try:
+            response = requests.post(endpoint_url, json=message, timeout=5)
+            response.raise_for_status()
+            logger.info(
+                f"Successfully sent message to {endpoint_url}: {response.status_code}"
+            )
+            print(response.json())
+        except requests.exceptions.RequestException as e:
+            logger.error(f"Failed to call endpoint {endpoint_url}: {e}")
+            raise

app/routes/loan.py

@@ -1,6 +1,8 @@
 from flask import Blueprint, request, jsonify, current_app
 import requests
 from app.utils.auth import get_headers
+from app.integrations import KafkaIntegration
+from threading import Thread
 
 loan_bp = Blueprint("loan", __name__)
 
@@ -154,8 +156,10 @@ def disbursement():
     data = request.json
     api_url = f"{current_app.config['API_BASE_URL']}/Disbursement"
 
-    response = requests.post(api_url, json=data, headers=get_headers())
-    return jsonify(response.json()), response.status_code
+    return jsonify({"requestId": data["requestId"]}), 200
+
+    # response = requests.post(api_url, json=data, headers=get_headers())
+    # return jsonify(response.json()), response.status_code
 
 
 @loan_bp.route("/collect-loan", methods=["POST"])