Implement connect api in data.py - to connect influxdb, fetch NSSI performance report...

Change-Id: I9f3eaf636aa41318582bda00e23d8a93c819eaac
Signed-off-by: sunil.n <sunil.n@samsung.com>

diff --git a/sample-rapp-generator/rapp-slice-prb-prediction/README.md b/sample-rapp-generator/rapp-slice-prb-prediction/README.md
index f7a0c2b..2543946 100644 (file)
--- a/sample-rapp-generator/rapp-slice-prb-prediction/README.md
+++ b/sample-rapp-generator/rapp-slice-prb-prediction/README.md
@@ -133,7 +133,12 @@ The `config.json` file contains all necessary configuration parameters for the R
 
 ## Database Management (`src/data.py`)
 
-The `data.py` module implements a comprehensive database configuration and management class that centralizes all InfluxDB connection settings and configuration loading for the RAPP. This component provides a unified interface for database operations and configuration management.
+The `data.py` module implements a comprehensive database configuration and management class that centralizes all InfluxDB connection settings and configuration loading for the RAPP. This component provides a unified interface for database operations and configuration management with enhanced connection handling and robust error management.
+
+**Key Import Enhancements:**
+- **`influxdb_client`**: Direct import of the InfluxDB client library for database connectivity
+- **`time`**: Added for implementing retry logic and connection delay mechanisms
+- **`RequestException`**: Specific exception handling for HTTP and network-related errors
 
 ### Key Features
 
@@ -141,7 +146,9 @@ The `data.py` module implements a comprehensive database configuration and manag
 - **Environment Variable Support**: Supports INFLUX_TOKEN environment variable for secure credential management
 - **Flexible Configuration**: Handles both static configuration and dynamic service discovery parameters
 - **Pandas Integration**: Configures pandas display options for optimal data visualization
-- **Error Handling**: Includes logging for configuration loading and validation
+- **Connection Management**: Robust InfluxDB connection handling with automatic reconnection and retry logic
+- **Error Handling**: Comprehensive error handling for configuration loading, connection issues, and database operations
+- **Version Verification**: Automatic InfluxDB server version detection for compatibility checking
 
 ### DATABASE Class
 
@@ -211,12 +218,28 @@ pd.set_option('display.width', 1000)           # Adjust width to avoid line brea
 pd.set_option('display.colheader_justify', 'left')  # Align headers left
 ```
 
-#### Usage Example
+#### Connection Management
+
+The DATABASE class provides robust connection management with automatic reconnection and error handling:
+
 ```python
 # Initialize database configuration
 db = DATABASE()
+
+# Establish connection to InfluxDB
+if db.connect():
+    logger.info("Successfully connected to InfluxDB")
+    # Perform database operations
+else:
+    logger.error("Failed to connect to InfluxDB")
 ```
 
+**Error Handling:**
+- Catches `RequestException` and `ConnectionError` for network-related issues
+- Provides detailed error logging for troubleshooting
+- Implements automatic retry delay to handle temporary network issues
+- Logs InfluxDB version information for debugging compatibility issues
+
 #### Integration with RAPP Architecture
 
 The DATABASE class serves as the foundation for all data operations in the RAPP:
@@ -226,14 +249,6 @@ The DATABASE class serves as the foundation for all data operations in the RAPP:
 3. **Performance Monitoring**: Enables KPI data collection and analysis
 4. **Service Discovery**: Supports SME integration for dynamic endpoint resolution
 
-#### Error Handling and Logging
-
-The class includes comprehensive error handling:
-- Configuration file validation and error reporting
-- Environment variable detection and fallback handling
-- Logging for configuration loading status
-- Graceful handling of missing configuration parameters
-
 #### Benefits
 
 - **Centralized Management**: All database configuration in one place

diff --git a/sample-rapp-generator/rapp-slice-prb-prediction/src/data.py b/sample-rapp-generator/rapp-slice-prb-prediction/src/data.py
index a340996..fc85456 100644 (file)
--- a/sample-rapp-generator/rapp-slice-prb-prediction/src/data.py
+++ b/sample-rapp-generator/rapp-slice-prb-prediction/src/data.py
@@ -1,9 +1,13 @@
 import logging
+import time
+import influxdb_client
 import pandas as pd
 
 import json
 import os
 
+from requests import RequestException
+
 logger = logging.getLogger(__name__)
 
 class DATABASE(object):
@@ -62,3 +66,18 @@ class DATABASE(object):
         self.window_size = int(window_size_str)
         self.tag_slice_type = influx_config.get("tag_slice_type")
         self.tag_nssi_id = influx_config.get("tag_nssi_id")
+
+    # Connect with influxdb
+    def connect(self):
+        if self.client is not None:
+            self.client.close()
+
+        try:
+            self.client = influxdb_client.InfluxDBClient(url=self.address, org=self.org, token=self.token)
+            version = self.client.version()
+            logger.info("Connected to Influx Database, InfluxDB version : {}".format(version))
+            return True
+
+        except (RequestException, ConnectionError):
+            logger.error("Failed to establish a new connection with InflulxDB, Please check your url/hostname")
+            time.sleep(120)
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