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""" |
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MyEMS Modbus TCP Gateway Service - Data Acquisition Module |
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This module handles the core data acquisition functionality for Modbus TCP devices. |
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It connects to Modbus TCP servers (slave devices), reads data from configured points, |
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and stores the collected data in the MyEMS historical database. |
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The acquisition process performs the following functions: |
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1. Updates process ID in database for monitoring |
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2. Checks connectivity to the Modbus TCP host and port |
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3. Retrieves point configuration from system database |
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4. Reads point values from Modbus TCP slaves using configured parameters |
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5. Processes and validates the collected data |
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6. Bulk inserts point values and updates latest values in historical database |
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The module supports multiple data types: |
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- ANALOG_VALUE: Continuous sensor readings (temperature, pressure, flow, etc.) |
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- DIGITAL_VALUE: Binary states (on/off, open/closed, alarm status, etc.) |
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- ENERGY_VALUE: Cumulative energy consumption data (kWh readings) |
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Data processing includes: |
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- Ratio and offset calculations for calibration |
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- Byte swapping for devices with non-standard byte order |
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- Data validation and range checking |
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- Trend data storage and latest value updates |
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""" |
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import os |
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import json |
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import math |
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import telnetlib3 |
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import asyncio |
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import time |
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from datetime import datetime |
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from decimal import Decimal |
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import mysql.connector |
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from modbus_tk import modbus_tcp |
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import config |
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from byte_swap import byte_swap_32_bit, byte_swap_64_bit |
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######################################################################################################################## |
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# Check connectivity to the host and port |
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######################################################################################################################## |
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async def check_connectivity(host, port): |
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""" |
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Test basic TCP connectivity to a Modbus TCP host and port. |
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This function attempts to establish a TCP connection to verify that the |
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target Modbus TCP server is reachable before attempting Modbus communication. |
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Args: |
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host: Target hostname or IP address of the Modbus TCP server |
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port: Target port number (typically 502 for Modbus TCP) |
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Raises: |
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Exception: If connection fails |
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""" |
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reader, writer = await telnetlib3.open_connection(host, port) |
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# Close the connection immediately after establishing it |
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writer.close() |
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######################################################################################################################## |
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# Data Acquisition Procedures |
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# Step 1: Update process ID in database for monitoring and management |
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# Step 2: Check connectivity to the Modbus TCP host and port |
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# Step 3: Get point list from system database for this data source |
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# Step 4: Read point values from Modbus TCP slaves using configured parameters |
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# Step 5: Bulk insert point values and update latest values in historical database |
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######################################################################################################################## |
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def process(logger, data_source_id, host, port, interval_in_seconds): |
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""" |
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Main data acquisition process function. |
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This function manages the complete data acquisition lifecycle for a Modbus TCP data source. |
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It runs continuously, connecting to the Modbus device, reading configured points, |
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and storing the data in the historical database. |
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Args: |
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logger: Logger instance for recording acquisition activities and errors |
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data_source_id: Unique identifier for the data source in the system database |
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host: Hostname or IP address of the Modbus TCP server |
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port: Port number of the Modbus TCP server (typically 502) |
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interval_in_seconds: Time interval between data acquisition cycles |
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""" |
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#################################################################################################################### |
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# Step 1: Update process ID in database for monitoring and management |
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#################################################################################################################### |
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cnx_system_db = None |
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cursor_system_db = None |
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# Connect to system database to register this acquisition process |
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try: |
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cnx_system_db = mysql.connector.connect(**config.myems_system_db) |
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cursor_system_db = cnx_system_db.cursor() |
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except Exception as e: |
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logger.error("Error in step 1.1 of acquisition process " + str(e)) |
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# Clean up database connections in case of error |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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return |
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# Update the data source record with the current process ID for monitoring |
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update_row = (" UPDATE tbl_data_sources " |
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" SET process_id = %s " |
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" WHERE id = %s ") |
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try: |
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cursor_system_db.execute(update_row, (os.getpid(), data_source_id,)) |
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cnx_system_db.commit() |
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except Exception as e: |
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logger.error("Error in step 1.2 of acquisition process " + str(e)) |
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return |
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finally: |
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# Always clean up database connections |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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# Main acquisition loop - runs continuously until process termination |
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while True: |
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# Begin of the outermost while loop |
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################################################################################################################ |
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# Step 2: Check connectivity to the Modbus TCP host and port |
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################################################################################################################ |
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try: |
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# Test basic TCP connectivity before attempting Modbus communication |
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asyncio.run(check_connectivity(host, port)) |
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print("Succeeded to connect %s:%s in acquisition process ", host, port) |
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except Exception as e: |
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logger.error("Failed to connect %s:%s in acquisition process: %s ", host, port, str(e)) |
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# Go to begin of the outermost while loop and wait before retrying |
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time.sleep(300) # Wait 5 minutes before retrying connection |
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continue |
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################################################################################################################ |
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# Step 3: Get point list from system database for this data source |
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################################################################################################################ |
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cnx_system_db = None |
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cursor_system_db = None |
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# Connect to system database to retrieve point configuration |
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try: |
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cnx_system_db = mysql.connector.connect(**config.myems_system_db) |
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cursor_system_db = cnx_system_db.cursor() |
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except Exception as e: |
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logger.error("Error in step 3.1 of acquisition process " + str(e)) |
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# Clean up database connections in case of error |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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# Go to begin of the outermost while loop |
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time.sleep(60) |
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continue |
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# Retrieve all configured points for this data source |
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try: |
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query = (" SELECT id, name, object_type, is_trend, ratio, offset_constant, address " |
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" FROM tbl_points " |
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" WHERE data_source_id = %s AND is_virtual = 0 " |
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" ORDER BY id ") |
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cursor_system_db.execute(query, (data_source_id,)) |
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rows_point = cursor_system_db.fetchall() |
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except Exception as e: |
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logger.error("Error in step 3.2 of acquisition process: " + str(e)) |
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# Clean up database connections in case of error |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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# Go to begin of the outermost while loop |
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time.sleep(60) |
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continue |
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180
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# Validate that points were found for this data source |
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if rows_point is None or len(rows_point) == 0: |
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# There are no points configured for this data source |
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logger.error("Point Not Found in Data Source (ID = %s), acquisition process terminated ", data_source_id) |
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# Clean up database connections |
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if cursor_system_db: |
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cursor_system_db.close() |
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if cnx_system_db: |
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cnx_system_db.close() |
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# Go to begin of the outermost while loop |
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time.sleep(60) |
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continue |
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192
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193
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# Build point list from database results |
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# There are points configured for this data source |
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point_list = list() |
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196
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for row_point in rows_point: |
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197
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point_list.append({"id": row_point[0], |
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198
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"name": row_point[1], |
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199
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"object_type": row_point[2], |
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200
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"is_trend": row_point[3], |
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201
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"ratio": row_point[4], |
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"offset_constant": row_point[5], |
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203
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"address": row_point[6]}) |
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204
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205
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################################################################################################################ |
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206
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# Step 4: Read point values from Modbus TCP slaves using configured parameters |
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################################################################################################################ |
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208
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# Connect to historical database for storing collected data |
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209
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cnx_historical_db = None |
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210
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cursor_historical_db = None |
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211
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try: |
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212
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cnx_historical_db = mysql.connector.connect(**config.myems_historical_db) |
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213
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cursor_historical_db = cnx_historical_db.cursor() |
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except Exception as e: |
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215
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logger.error("Error in step 4.1 of acquisition process " + str(e)) |
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216
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# Clean up database connections in case of error |
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217
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if cursor_historical_db: |
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218
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cursor_historical_db.close() |
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219
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if cnx_historical_db: |
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220
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cnx_historical_db.close() |
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221
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222
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if cursor_system_db: |
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223
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cursor_system_db.close() |
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224
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if cnx_system_db: |
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225
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cnx_system_db.close() |
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226
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# Go to begin of the outermost while loop |
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227
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time.sleep(60) |
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228
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continue |
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229
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230
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# Connect to the Modbus TCP data source (slave device) |
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master = modbus_tcp.TcpMaster(host=host, port=port, timeout_in_sec=5.0) |
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232
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master.set_timeout(5.0) |
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233
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print("Ready to connect to %s:%s ", host, port) |
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234
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235
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# Inner while loop to read all point values periodically |
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236
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while True: |
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237
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# Begin of the inner while loop |
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238
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is_modbus_tcp_timed_out = False |
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239
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energy_value_list = list() |
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240
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analog_value_list = list() |
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241
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digital_value_list = list() |
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242
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|
243
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# TODO: Update point list in another thread for dynamic configuration changes |
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244
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# Process each configured point |
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245
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for point in point_list: |
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246
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# Begin of foreach point loop |
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247
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try: |
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248
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# Parse the point address configuration from JSON |
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249
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address = json.loads(point['address']) |
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250
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except Exception as e: |
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251
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logger.error("Error in step 4.2 of acquisition process: Invalid point address in JSON " + str(e)) |
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252
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continue |
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253
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|
254
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|
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# Validate point address configuration |
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255
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if 'slave_id' not in address.keys() \ |
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256
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or 'function_code' not in address.keys() \ |
|
257
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or 'offset' not in address.keys() \ |
|
258
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or 'number_of_registers' not in address.keys() \ |
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259
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or 'format' not in address.keys() \ |
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260
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or 'byte_swap' not in address.keys() \ |
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261
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or address['slave_id'] < 1 \ |
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262
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or address['function_code'] not in (1, 2, 3, 4) \ |
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263
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or address['offset'] < 0 \ |
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264
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or address['number_of_registers'] < 0 \ |
|
265
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or len(address['format']) < 1 \ |
|
266
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or not isinstance(address['byte_swap'], bool): |
|
267
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logger.error('Data Source(ID=%s), Point(ID=%s) Invalid address data.', |
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268
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data_source_id, point['id']) |
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269
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# Invalid point configuration found |
|
270
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|
# Go to begin of foreach point loop to process next point |
|
271
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continue |
|
272
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|
|
|
|
273
|
|
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# Read point value from Modbus TCP slave |
|
274
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try: |
|
275
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result = master.execute(slave=address['slave_id'], |
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276
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function_code=address['function_code'], |
|
277
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|
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starting_address=address['offset'], |
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278
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|
|
quantity_of_x=address['number_of_registers'], |
|
279
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data_format=address['format']) |
|
280
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except Exception as e: |
|
281
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logger.error(str(e) + |
|
282
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|
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" host:" + host + " port:" + str(port) + |
|
283
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|
|
" slave_id:" + str(address['slave_id']) + |
|
284
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|
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" function_code:" + str(address['function_code']) + |
|
285
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|
|
" starting_address:" + str(address['offset']) + |
|
286
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" quantity_of_x:" + str(address['number_of_registers']) + |
|
287
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|
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" data_format:" + str(address['format']) + |
|
288
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|
|
" byte_swap:" + str(address['byte_swap'])) |
|
289
|
|
|
|
|
290
|
|
|
if 'timed out' in str(e): |
|
291
|
|
|
is_modbus_tcp_timed_out = True |
|
292
|
|
|
# Timeout error - break the foreach point loop |
|
293
|
|
|
break |
|
294
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|
|
else: |
|
295
|
|
|
# Exception occurred when reading register value |
|
296
|
|
|
# Go to begin of foreach point loop to process next point |
|
297
|
|
|
continue |
|
298
|
|
|
|
|
299
|
|
|
# Validate the read result |
|
300
|
|
|
if result is None or not isinstance(result, tuple) or len(result) == 0: |
|
301
|
|
|
logger.error("Error in step 4.3 of acquisition process: \n" |
|
302
|
|
|
" invalid result: None " |
|
303
|
|
|
" for point_id: " + str(point['id'])) |
|
304
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|
|
# Invalid result |
|
305
|
|
|
# Go to begin of foreach point loop to process next point |
|
306
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|
|
continue |
|
307
|
|
|
|
|
308
|
|
|
# Validate the result value |
|
309
|
|
|
if not isinstance(result[0], float) and not isinstance(result[0], int) or math.isnan(result[0]): |
|
310
|
|
|
logger.error(" Error in step 4.4 of acquisition process:\n" |
|
311
|
|
|
" invalid result: not float and not int or not a number " |
|
312
|
|
|
" for point_id: " + str(point['id'])) |
|
313
|
|
|
# Invalid result |
|
314
|
|
|
# Go to begin of foreach point loop to process next point |
|
315
|
|
|
continue |
|
316
|
|
|
|
|
317
|
|
|
# Apply byte swapping if configured |
|
318
|
|
|
if address['byte_swap']: |
|
319
|
|
|
if address['number_of_registers'] == 2: |
|
320
|
|
|
# 32-bit data (2 registers) - swap adjacent bytes |
|
321
|
|
|
value = byte_swap_32_bit(result[0]) |
|
322
|
|
|
elif address['number_of_registers'] == 4: |
|
323
|
|
|
# 64-bit data (4 registers) - swap adjacent bytes |
|
324
|
|
|
value = byte_swap_64_bit(result[0]) |
|
325
|
|
|
else: |
|
326
|
|
|
# No byte swapping for other register counts |
|
327
|
|
|
value = result[0] |
|
328
|
|
|
else: |
|
329
|
|
|
# No byte swapping required |
|
330
|
|
|
value = result[0] |
|
331
|
|
|
|
|
332
|
|
|
# Process the value based on point type and apply ratio/offset |
|
333
|
|
|
if point['object_type'] == 'ANALOG_VALUE': |
|
334
|
|
|
# Standard SQL requires that DECIMAL(18, 3) be able to store any value with 18 digits and |
|
335
|
|
|
# 3 decimals, so values that can be stored in the column range |
|
336
|
|
|
# from -999999999999999.999 to 999999999999999.999. |
|
337
|
|
|
if Decimal(-999999999999999.999) <= Decimal(value) <= Decimal(999999999999999.999): |
|
338
|
|
|
analog_value_list.append({'point_id': point['id'], |
|
339
|
|
|
'is_trend': point['is_trend'], |
|
340
|
|
|
'value': Decimal(value) * point['ratio'] + point['offset_constant']}) |
|
341
|
|
|
elif point['object_type'] == 'ENERGY_VALUE': |
|
342
|
|
|
# Standard SQL requires that DECIMAL(18, 3) be able to store any value with 18 digits and |
|
343
|
|
|
# 3 decimals, so values that can be stored in the column range |
|
344
|
|
|
# from -999999999999999.999 to 999999999999999.999. |
|
345
|
|
|
if Decimal(-999999999999999.999) <= Decimal(value) <= Decimal(999999999999999.999): |
|
346
|
|
|
energy_value_list.append({'point_id': point['id'], |
|
347
|
|
|
'is_trend': point['is_trend'], |
|
348
|
|
|
'value': Decimal(value) * point['ratio'] + point['offset_constant']}) |
|
349
|
|
|
elif point['object_type'] == 'DIGITAL_VALUE': |
|
350
|
|
|
digital_value_list.append({'point_id': point['id'], |
|
351
|
|
|
'is_trend': point['is_trend'], |
|
352
|
|
|
'value': int(value) * int(point['ratio']) + int(point['offset_constant']) |
|
353
|
|
|
}) |
|
354
|
|
|
|
|
355
|
|
|
# End of foreach point loop |
|
356
|
|
|
|
|
357
|
|
|
if is_modbus_tcp_timed_out: |
|
358
|
|
|
# Modbus TCP connection timeout occurred |
|
359
|
|
|
# Clean up connections and restart the acquisition process |
|
360
|
|
|
|
|
361
|
|
|
# Destroy the Modbus master connection |
|
362
|
|
|
del master |
|
363
|
|
|
|
|
364
|
|
|
# Close all database connections |
|
365
|
|
|
if cursor_historical_db: |
|
366
|
|
|
cursor_historical_db.close() |
|
367
|
|
|
if cnx_historical_db: |
|
368
|
|
|
cnx_historical_db.close() |
|
369
|
|
|
if cursor_system_db: |
|
370
|
|
|
cursor_system_db.close() |
|
371
|
|
|
if cnx_system_db: |
|
372
|
|
|
cnx_system_db.close() |
|
373
|
|
|
|
|
374
|
|
|
# Break the inner while loop and go to begin of the outermost while loop |
|
375
|
|
|
time.sleep(60) |
|
376
|
|
|
break |
|
377
|
|
|
|
|
378
|
|
|
############################################################################################################ |
|
379
|
|
|
# Step 5: Bulk insert point values and update latest values in historical database |
|
380
|
|
|
############################################################################################################ |
|
381
|
|
|
# Check the connection to the Historical Database |
|
382
|
|
|
if not cnx_historical_db.is_connected(): |
|
383
|
|
|
try: |
|
384
|
|
|
cnx_historical_db = mysql.connector.connect(**config.myems_historical_db) |
|
385
|
|
|
cursor_historical_db = cnx_historical_db.cursor() |
|
386
|
|
|
except Exception as e: |
|
387
|
|
|
logger.error("Error in step 5.1 of acquisition process: " + str(e)) |
|
388
|
|
|
# Clean up database connections in case of error |
|
389
|
|
|
if cursor_historical_db: |
|
390
|
|
|
cursor_historical_db.close() |
|
391
|
|
|
if cnx_historical_db: |
|
392
|
|
|
cnx_historical_db.close() |
|
393
|
|
|
# Go to begin of the inner while loop |
|
394
|
|
|
time.sleep(60) |
|
395
|
|
|
continue |
|
396
|
|
|
|
|
397
|
|
|
# Check the connection to the System Database |
|
398
|
|
|
if not cnx_system_db.is_connected(): |
|
399
|
|
|
try: |
|
400
|
|
|
cnx_system_db = mysql.connector.connect(**config.myems_system_db) |
|
401
|
|
|
cursor_system_db = cnx_system_db.cursor() |
|
402
|
|
|
except Exception as e: |
|
403
|
|
|
logger.error("Error in step 5.2 of acquisition process: " + str(e)) |
|
404
|
|
|
# Clean up database connections in case of error |
|
405
|
|
|
if cursor_system_db: |
|
406
|
|
|
cursor_system_db.close() |
|
407
|
|
|
if cnx_system_db: |
|
408
|
|
|
cnx_system_db.close() |
|
409
|
|
|
# Go to begin of the inner while loop |
|
410
|
|
|
time.sleep(60) |
|
411
|
|
|
continue |
|
412
|
|
|
|
|
413
|
|
|
# Get current UTC timestamp for data storage |
|
414
|
|
|
current_datetime_utc = datetime.utcnow() |
|
415
|
|
|
|
|
416
|
|
|
# Bulk insert analog values into historical database and update latest values |
|
417
|
|
|
# Process in batches of 100 to avoid overwhelming the database |
|
418
|
|
View Code Duplication |
while len(analog_value_list) > 0: |
|
|
|
|
|
|
419
|
|
|
analog_value_list_100 = analog_value_list[:100] # Take first 100 items |
|
420
|
|
|
analog_value_list = analog_value_list[100:] # Remove processed items |
|
421
|
|
|
|
|
422
|
|
|
# Build INSERT statement for trend data (historical values) |
|
423
|
|
|
add_values = (" INSERT INTO tbl_analog_value (point_id, utc_date_time, actual_value) " |
|
424
|
|
|
" VALUES ") |
|
425
|
|
|
trend_value_count = 0 |
|
426
|
|
|
|
|
427
|
|
|
# Add trend values to INSERT statement |
|
428
|
|
|
for point_value in analog_value_list_100: |
|
429
|
|
|
if point_value['is_trend']: |
|
430
|
|
|
add_values += " (" + str(point_value['point_id']) + "," |
|
431
|
|
|
add_values += "'" + current_datetime_utc.isoformat() + "'," |
|
432
|
|
|
add_values += str(point_value['value']) + "), " |
|
433
|
|
|
trend_value_count += 1 |
|
434
|
|
|
|
|
435
|
|
|
# Execute trend data insertion if there are trend values |
|
436
|
|
|
if trend_value_count > 0: |
|
437
|
|
|
try: |
|
438
|
|
|
# Trim ", " at the end of string and then execute |
|
439
|
|
|
cursor_historical_db.execute(add_values[:-2]) |
|
440
|
|
|
cnx_historical_db.commit() |
|
441
|
|
|
except Exception as e: |
|
442
|
|
|
logger.error("Error in step 5.3.1 of acquisition process " + str(e)) |
|
443
|
|
|
# Ignore this exception and continue processing |
|
444
|
|
|
|
|
445
|
|
|
# Update latest values table for analog values |
|
446
|
|
|
delete_values = " DELETE FROM tbl_analog_value_latest WHERE point_id IN ( " |
|
447
|
|
|
latest_values = (" INSERT INTO tbl_analog_value_latest (point_id, utc_date_time, actual_value) " |
|
448
|
|
|
" VALUES ") |
|
449
|
|
|
latest_value_count = 0 |
|
450
|
|
|
|
|
451
|
|
|
# Build DELETE and INSERT statements for latest values |
|
452
|
|
|
for point_value in analog_value_list_100: |
|
453
|
|
|
delete_values += str(point_value['point_id']) + "," |
|
454
|
|
|
latest_values += " (" + str(point_value['point_id']) + "," |
|
455
|
|
|
latest_values += "'" + current_datetime_utc.isoformat() + "'," |
|
456
|
|
|
latest_values += str(point_value['value']) + "), " |
|
457
|
|
|
latest_value_count += 1 |
|
458
|
|
|
|
|
459
|
|
|
# Execute latest values update if there are values to process |
|
460
|
|
|
if latest_value_count > 0: |
|
461
|
|
|
try: |
|
462
|
|
|
# Replace "," at the end of string with ")" and execute DELETE |
|
463
|
|
|
cursor_historical_db.execute(delete_values[:-1] + ")") |
|
464
|
|
|
cnx_historical_db.commit() |
|
465
|
|
|
except Exception as e: |
|
466
|
|
|
logger.error("Error in step 5.3.2 of acquisition process " + str(e)) |
|
467
|
|
|
# Ignore this exception and continue processing |
|
468
|
|
|
|
|
469
|
|
|
try: |
|
470
|
|
|
# Trim ", " at the end of string and then execute INSERT |
|
471
|
|
|
cursor_historical_db.execute(latest_values[:-2]) |
|
472
|
|
|
cnx_historical_db.commit() |
|
473
|
|
|
except Exception as e: |
|
474
|
|
|
logger.error("Error in step 5.3.3 of acquisition process " + str(e)) |
|
475
|
|
|
# Ignore this exception and continue processing |
|
476
|
|
|
|
|
477
|
|
|
# Bulk insert energy values into historical database and update latest values |
|
478
|
|
|
# Process in batches of 100 to avoid overwhelming the database |
|
479
|
|
View Code Duplication |
while len(energy_value_list) > 0: |
|
|
|
|
|
|
480
|
|
|
energy_value_list_100 = energy_value_list[:100] # Take first 100 items |
|
481
|
|
|
energy_value_list = energy_value_list[100:] # Remove processed items |
|
482
|
|
|
|
|
483
|
|
|
# Build INSERT statement for trend data (historical values) |
|
484
|
|
|
add_values = (" INSERT INTO tbl_energy_value (point_id, utc_date_time, actual_value) " |
|
485
|
|
|
" VALUES ") |
|
486
|
|
|
trend_value_count = 0 |
|
487
|
|
|
|
|
488
|
|
|
# Add trend values to INSERT statement |
|
489
|
|
|
for point_value in energy_value_list_100: |
|
490
|
|
|
if point_value['is_trend']: |
|
491
|
|
|
add_values += " (" + str(point_value['point_id']) + "," |
|
492
|
|
|
add_values += "'" + current_datetime_utc.isoformat() + "'," |
|
493
|
|
|
add_values += str(point_value['value']) + "), " |
|
494
|
|
|
trend_value_count += 1 |
|
495
|
|
|
|
|
496
|
|
|
# Execute trend data insertion if there are trend values |
|
497
|
|
|
if trend_value_count > 0: |
|
498
|
|
|
try: |
|
499
|
|
|
# Trim ", " at the end of string and then execute |
|
500
|
|
|
cursor_historical_db.execute(add_values[:-2]) |
|
501
|
|
|
cnx_historical_db.commit() |
|
502
|
|
|
except Exception as e: |
|
503
|
|
|
logger.error("Error in step 5.4.1 of acquisition process: " + str(e)) |
|
504
|
|
|
# Ignore this exception and continue processing |
|
505
|
|
|
|
|
506
|
|
|
# Update latest values table for energy values |
|
507
|
|
|
delete_values = " DELETE FROM tbl_energy_value_latest WHERE point_id IN ( " |
|
508
|
|
|
latest_values = (" INSERT INTO tbl_energy_value_latest (point_id, utc_date_time, actual_value) " |
|
509
|
|
|
" VALUES ") |
|
510
|
|
|
latest_value_count = 0 |
|
511
|
|
|
|
|
512
|
|
|
# Build DELETE and INSERT statements for latest values |
|
513
|
|
|
for point_value in energy_value_list_100: |
|
514
|
|
|
delete_values += str(point_value['point_id']) + "," |
|
515
|
|
|
latest_values += " (" + str(point_value['point_id']) + "," |
|
516
|
|
|
latest_values += "'" + current_datetime_utc.isoformat() + "'," |
|
517
|
|
|
latest_values += str(point_value['value']) + "), " |
|
518
|
|
|
latest_value_count += 1 |
|
519
|
|
|
|
|
520
|
|
|
# Execute latest values update if there are values to process |
|
521
|
|
|
if latest_value_count > 0: |
|
522
|
|
|
try: |
|
523
|
|
|
# Replace "," at the end of string with ")" and execute DELETE |
|
524
|
|
|
cursor_historical_db.execute(delete_values[:-1] + ")") |
|
525
|
|
|
cnx_historical_db.commit() |
|
526
|
|
|
except Exception as e: |
|
527
|
|
|
logger.error("Error in step 5.4.2 of acquisition process " + str(e)) |
|
528
|
|
|
# Ignore this exception and continue processing |
|
529
|
|
|
|
|
530
|
|
|
try: |
|
531
|
|
|
# Trim ", " at the end of string and then execute INSERT |
|
532
|
|
|
cursor_historical_db.execute(latest_values[:-2]) |
|
533
|
|
|
cnx_historical_db.commit() |
|
534
|
|
|
except Exception as e: |
|
535
|
|
|
logger.error("Error in step 5.4.3 of acquisition process " + str(e)) |
|
536
|
|
|
# Ignore this exception and continue processing |
|
537
|
|
|
|
|
538
|
|
|
# Bulk insert digital values into historical database and update latest values |
|
539
|
|
|
# Process in batches of 100 to avoid overwhelming the database |
|
540
|
|
View Code Duplication |
while len(digital_value_list) > 0: |
|
|
|
|
|
|
541
|
|
|
digital_value_list_100 = digital_value_list[:100] # Take first 100 items |
|
542
|
|
|
digital_value_list = digital_value_list[100:] # Remove processed items |
|
543
|
|
|
|
|
544
|
|
|
# Build INSERT statement for trend data (historical values) |
|
545
|
|
|
add_values = (" INSERT INTO tbl_digital_value (point_id, utc_date_time, actual_value) " |
|
546
|
|
|
" VALUES ") |
|
547
|
|
|
trend_value_count = 0 |
|
548
|
|
|
|
|
549
|
|
|
# Add trend values to INSERT statement |
|
550
|
|
|
for point_value in digital_value_list_100: |
|
551
|
|
|
if point_value['is_trend']: |
|
552
|
|
|
add_values += " (" + str(point_value['point_id']) + "," |
|
553
|
|
|
add_values += "'" + current_datetime_utc.isoformat() + "'," |
|
554
|
|
|
add_values += str(point_value['value']) + "), " |
|
555
|
|
|
trend_value_count += 1 |
|
556
|
|
|
|
|
557
|
|
|
# Execute trend data insertion if there are trend values |
|
558
|
|
|
if trend_value_count > 0: |
|
559
|
|
|
try: |
|
560
|
|
|
# Trim ", " at the end of string and then execute |
|
561
|
|
|
cursor_historical_db.execute(add_values[:-2]) |
|
562
|
|
|
cnx_historical_db.commit() |
|
563
|
|
|
except Exception as e: |
|
564
|
|
|
logger.error("Error in step 5.5.1 of acquisition process: " + str(e)) |
|
565
|
|
|
# Ignore this exception and continue processing |
|
566
|
|
|
|
|
567
|
|
|
# Update latest values table for digital values |
|
568
|
|
|
delete_values = " DELETE FROM tbl_digital_value_latest WHERE point_id IN ( " |
|
569
|
|
|
latest_values = (" INSERT INTO tbl_digital_value_latest (point_id, utc_date_time, actual_value) " |
|
570
|
|
|
" VALUES ") |
|
571
|
|
|
latest_value_count = 0 |
|
572
|
|
|
|
|
573
|
|
|
# Build DELETE and INSERT statements for latest values |
|
574
|
|
|
for point_value in digital_value_list_100: |
|
575
|
|
|
delete_values += str(point_value['point_id']) + "," |
|
576
|
|
|
latest_values += " (" + str(point_value['point_id']) + "," |
|
577
|
|
|
latest_values += "'" + current_datetime_utc.isoformat() + "'," |
|
578
|
|
|
latest_values += str(point_value['value']) + "), " |
|
579
|
|
|
latest_value_count += 1 |
|
580
|
|
|
|
|
581
|
|
|
# Execute latest values update if there are values to process |
|
582
|
|
|
if latest_value_count > 0: |
|
583
|
|
|
try: |
|
584
|
|
|
# Replace "," at the end of string with ")" and execute DELETE |
|
585
|
|
|
cursor_historical_db.execute(delete_values[:-1] + ")") |
|
586
|
|
|
cnx_historical_db.commit() |
|
587
|
|
|
except Exception as e: |
|
588
|
|
|
logger.error("Error in step 5.5.2 of acquisition process " + str(e)) |
|
589
|
|
|
# Ignore this exception and continue processing |
|
590
|
|
|
|
|
591
|
|
|
try: |
|
592
|
|
|
# Trim ", " at the end of string and then execute INSERT |
|
593
|
|
|
cursor_historical_db.execute(latest_values[:-2]) |
|
594
|
|
|
cnx_historical_db.commit() |
|
595
|
|
|
except Exception as e: |
|
596
|
|
|
logger.error("Error in step 5.5.3 of acquisition process " + str(e)) |
|
597
|
|
|
# Ignore this exception and continue processing |
|
598
|
|
|
|
|
599
|
|
|
# Update data source last seen datetime to indicate successful data collection |
|
600
|
|
|
update_row = (" UPDATE tbl_data_sources " |
|
601
|
|
|
" SET last_seen_datetime_utc = '" + current_datetime_utc.isoformat() + "' " |
|
602
|
|
|
" WHERE id = %s ") |
|
603
|
|
|
try: |
|
604
|
|
|
cursor_system_db.execute(update_row, (data_source_id,)) |
|
605
|
|
|
cnx_system_db.commit() |
|
606
|
|
|
except Exception as e: |
|
607
|
|
|
logger.error("Error in step 5.6 of acquisition process " + str(e)) |
|
608
|
|
|
# Clean up database connections in case of error |
|
609
|
|
|
if cursor_system_db: |
|
610
|
|
|
cursor_system_db.close() |
|
611
|
|
|
if cnx_system_db: |
|
612
|
|
|
cnx_system_db.close() |
|
613
|
|
|
# Go to begin of the inner while loop |
|
614
|
|
|
time.sleep(60) |
|
615
|
|
|
continue |
|
616
|
|
|
|
|
617
|
|
|
# Sleep for the configured interval before starting the next data collection cycle |
|
618
|
|
|
# This argument may be a floating point number for subsecond precision |
|
619
|
|
|
time.sleep(interval_in_seconds) |
|
620
|
|
|
|
|
621
|
|
|
# End of the inner while loop |
|
622
|
|
|
|
|
623
|
|
|
# End of the outermost while loop |
|
624
|
|
|
|
MyEMS /
myems
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