475 lines
24 KiB
Python
475 lines
24 KiB
Python
import time
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from datetime import datetime, timedelta
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import mysql.connector
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from sympy import sympify
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from multiprocessing import Pool
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import random
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import config
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########################################################################################################################
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# PROCEDURES:
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# Step 1: Query all virtual meters
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# Step 2: Create multiprocessing pool to call worker in parallel
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########################################################################################################################
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def calculate_hourly(logger):
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while True:
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# outer loop to reconnect server if there is a connection error
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cnx_system_db = None
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cursor_system_db = None
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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 0 of virtual_meter.calculate_hourly " + str(e))
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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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# sleep and continue the outer loop to reconnect the database
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time.sleep(60)
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continue
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print("Connected to MyEMS System Database")
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virtual_meter_list = list()
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try:
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cursor_system_db.execute(" SELECT id, name, equation "
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" FROM tbl_virtual_meters "
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" ORDER BY id ")
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rows_virtual_meters = cursor_system_db.fetchall()
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if rows_virtual_meters is None or len(rows_virtual_meters) == 0:
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# sleep several minutes and continue the outer loop to reconnect the database
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time.sleep(60)
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continue
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for row in rows_virtual_meters:
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meta_result = {"id": row[0], "name": row[1], "equation": row[2]}
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virtual_meter_list.append(meta_result)
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except Exception as e:
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logger.error("Error in step 1 of virtual meter calculate hourly " + str(e))
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# sleep and continue the outer loop to reconnect the database
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time.sleep(60)
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continue
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finally:
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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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# shuffle the virtual meter list for randomly calculating the meter hourly value
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random.shuffle(virtual_meter_list)
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print("Got all virtual meters in MyEMS System Database")
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################################################################################################################
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# Step 2: Create multiprocessing pool to call worker in parallel
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################################################################################################################
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p = Pool(processes=config.pool_size)
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error_list = p.map(worker, virtual_meter_list)
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p.close()
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p.join()
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for error in error_list:
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if error is not None and len(error) > 0:
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logger.error(error)
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print("go to sleep ...")
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time.sleep(60)
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print("wake from sleep, and continue to work...")
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########################################################################################################################
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# Step 1: get start datetime and end datetime
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# Step 2: parse the expression and get all meters, virtual meters, offline meters associated with the expression
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# Step 3: query energy consumption values from table meter hourly, virtual meter hourly and offline meter hourly
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# Step 4: evaluate the equation with variables values from previous step and save to table virtual meter hourly
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# returns the error string for logging or returns None
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########################################################################################################################
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def worker(virtual_meter):
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cnx_energy_db = None
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cursor_energy_db = None
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try:
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cnx_energy_db = mysql.connector.connect(**config.myems_energy_db)
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cursor_energy_db = cnx_energy_db.cursor()
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except Exception as e:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 1.1 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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print("Start to process virtual meter: " + "'" + virtual_meter['name']+"'")
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####################################################################################################################
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# step 1: get start datetime and end datetime
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# get latest timestamp from energy database in tbl_virtual_meter_hourly
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####################################################################################################################
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try:
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query = (" SELECT MAX(start_datetime_utc) "
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" FROM tbl_virtual_meter_hourly "
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" WHERE virtual_meter_id = %s ")
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cursor_energy_db.execute(query, (virtual_meter['id'],))
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row_datetime = cursor_energy_db.fetchone()
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except Exception as e:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 1.2 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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start_datetime_utc = datetime.strptime(config.start_datetime_utc, '%Y-%m-%d %H:%M:%S')
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start_datetime_utc = start_datetime_utc.replace(minute=0, second=0, microsecond=0, tzinfo=None)
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if row_datetime is not None and len(row_datetime) > 0 and isinstance(row_datetime[0], datetime):
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# replace second and microsecond with 0
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# note: do not replace minute in case of calculating in half hourly
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start_datetime_utc = row_datetime[0].replace(second=0, microsecond=0, tzinfo=None)
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# start from the next time slot
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start_datetime_utc += timedelta(minutes=config.minutes_to_count)
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end_datetime_utc = datetime.utcnow().replace()
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end_datetime_utc = end_datetime_utc.replace(second=0, microsecond=0, tzinfo=None)
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time_difference = end_datetime_utc - start_datetime_utc
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time_difference_in_minutes = time_difference / timedelta(minutes=1)
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if time_difference_in_minutes < config.minutes_to_count:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "it's too early to calculate" + " for '" + virtual_meter['name'] + "'"
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# trim end_datetime_utc
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trimmed_end_datetime_utc = start_datetime_utc + timedelta(minutes=config.minutes_to_count)
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while trimmed_end_datetime_utc <= end_datetime_utc:
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trimmed_end_datetime_utc += timedelta(minutes=config.minutes_to_count)
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end_datetime_utc = trimmed_end_datetime_utc - timedelta(minutes=config.minutes_to_count)
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if end_datetime_utc <= start_datetime_utc:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "it's too early to calculate" + " for '" + virtual_meter['name'] + "'"
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print("start_datetime_utc: " + start_datetime_utc.isoformat()[0:19]
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+ "end_datetime_utc: " + end_datetime_utc.isoformat()[0:19])
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############################################################################################################
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# Step 2: parse the expression and get all meters, virtual meters, and
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# offline meters associated with the expression
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############################################################################################################
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cnx_system_db = None
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cursor_system_db = None
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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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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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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 2.1 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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meter_list_in_expression = list()
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virtual_meter_list_in_expression = list()
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offline_meter_list_in_expression = list()
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try:
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########################################################################################################
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# get all meters associated with the expression
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########################################################################################################
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cursor_system_db.execute(" SELECT m.id as meter_id, v.name as variable_name "
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" FROM tbl_meters m, tbl_variables v "
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" WHERE m.id = v.meter_id "
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" AND v.meter_type = 'meter' "
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" AND v.virtual_meter_id = %s ",
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(virtual_meter['id'], ))
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rows = cursor_system_db.fetchall()
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if rows is not None and len(rows) > 0:
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for row in rows:
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meter_list_in_expression.append({"meter_id": row[0], "variable_name": row[1].lower()})
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########################################################################################################
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# get all virtual meters associated with the expression
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########################################################################################################
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cursor_system_db.execute(" SELECT m.id as virtual_meter_id, v.name as variable_name "
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" FROM tbl_virtual_meters m, tbl_variables v "
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" WHERE m.id = v.meter_id "
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" AND v.meter_type = 'virtual_meter' "
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" AND v.virtual_meter_id = %s ",
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(virtual_meter['id'],))
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rows = cursor_system_db.fetchall()
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if rows is not None and len(rows) > 0:
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for row in rows:
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virtual_meter_list_in_expression.append({"virtual_meter_id": row[0],
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"variable_name": row[1].lower()})
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########################################################################################################
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# get all offline meters associated with the expression
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########################################################################################################
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cursor_system_db.execute(" SELECT m.id as offline_meter_id, v.name as variable_name "
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" FROM tbl_offline_meters m, tbl_variables v "
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" WHERE m.id = v.meter_id "
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" AND v.meter_type = 'offline_meter' "
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" AND v.virtual_meter_id = %s ",
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(virtual_meter['id'],))
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rows = cursor_system_db.fetchall()
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if rows is not None and len(rows) > 0:
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for row in rows:
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offline_meter_list_in_expression.append({"offline_meter_id": row[0],
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"variable_name": row[1].lower()})
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except Exception as e:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 2.2 of virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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finally:
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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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############################################################################################################
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# Step 3: query energy consumption values from table meter hourly, virtual meter hourly
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# and offline meter hourly
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############################################################################################################
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print("getting energy consumption values from myems_energy_db.tbl_meter_hourly...")
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energy_meter_hourly = dict()
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if meter_list_in_expression is not None and len(meter_list_in_expression) > 0:
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try:
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for meter_in_expression in meter_list_in_expression:
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meter_id = str(meter_in_expression['meter_id'])
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query = (" SELECT start_datetime_utc, actual_value "
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" FROM tbl_meter_hourly "
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" WHERE meter_id = %s AND start_datetime_utc >= %s AND start_datetime_utc < %s "
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" ORDER BY start_datetime_utc ")
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cursor_energy_db.execute(query, (meter_id, start_datetime_utc, end_datetime_utc, ))
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rows_energy_values = cursor_energy_db.fetchall()
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if rows_energy_values is None or len(rows_energy_values) == 0:
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energy_meter_hourly[meter_id] = None
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else:
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energy_meter_hourly[meter_id] = dict()
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for row_energy_value in rows_energy_values:
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energy_meter_hourly[meter_id][row_energy_value[0]] = row_energy_value[1]
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except Exception as e:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 3.2 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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print("getting energy consumption values from myems_energy_db.tbl_virtual_meter_hourly...")
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energy_virtual_meter_hourly = dict()
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if virtual_meter_list_in_expression is not None and len(virtual_meter_list_in_expression) > 0:
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try:
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for virtual_meter_in_expression in virtual_meter_list_in_expression:
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virtual_meter_id = str(virtual_meter_in_expression['virtual_meter_id'])
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query = (" SELECT start_datetime_utc, actual_value "
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" FROM tbl_virtual_meter_hourly "
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" WHERE virtual_meter_id = %s "
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" AND start_datetime_utc >= %s AND start_datetime_utc < %s "
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" ORDER BY start_datetime_utc ")
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cursor_energy_db.execute(query, (virtual_meter_id, start_datetime_utc, end_datetime_utc,))
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rows_energy_values = cursor_energy_db.fetchall()
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if rows_energy_values is None or len(rows_energy_values) == 0:
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energy_virtual_meter_hourly[virtual_meter_id] = None
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else:
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energy_virtual_meter_hourly[virtual_meter_id] = dict()
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for row_energy_value in rows_energy_values:
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energy_virtual_meter_hourly[virtual_meter_id][row_energy_value[0]] = row_energy_value[1]
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except Exception as e:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 3.3 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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print("getting energy consumption values from myems_energy_db.tbl_offline_meter_hourly...")
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energy_offline_meter_hourly = dict()
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if offline_meter_list_in_expression is not None and len(offline_meter_list_in_expression) > 0:
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try:
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for offline_meter_in_expression in offline_meter_list_in_expression:
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offline_meter_id = str(offline_meter_in_expression['offline_meter_id'])
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query = (" SELECT start_datetime_utc, actual_value "
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" FROM tbl_offline_meter_hourly "
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" WHERE offline_meter_id = %s "
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" AND start_datetime_utc >= %s AND start_datetime_utc < %s "
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" ORDER BY start_datetime_utc ")
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cursor_energy_db.execute(query, (offline_meter_id, start_datetime_utc, end_datetime_utc,))
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rows_energy_values = cursor_energy_db.fetchall()
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if rows_energy_values is None or len(rows_energy_values) == 0:
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energy_offline_meter_hourly[offline_meter_id] = None
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else:
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energy_offline_meter_hourly[offline_meter_id] = dict()
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for row_energy_value in rows_energy_values:
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energy_offline_meter_hourly[offline_meter_id][row_energy_value[0]] = row_energy_value[1]
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except Exception as e:
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if cursor_energy_db:
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cursor_energy_db.close()
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if cnx_energy_db:
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cnx_energy_db.close()
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return "Error in step 3.4 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
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############################################################################################################
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# Step 4: evaluate the equation with variables values from previous step
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# and save to table virtual meter hourly
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############################################################################################################
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print("getting common time slot of energy values for all meters...")
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common_start_datetime_utc = start_datetime_utc
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common_end_datetime_utc = end_datetime_utc
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if energy_meter_hourly is not None and len(energy_meter_hourly) > 0:
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for meter_id, energy_hourly in energy_meter_hourly.items():
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if energy_hourly is None or len(energy_hourly) == 0:
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common_start_datetime_utc = None
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common_end_datetime_utc = None
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break
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else:
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if common_start_datetime_utc < min(energy_hourly.keys()):
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common_start_datetime_utc = min(energy_hourly.keys())
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if common_end_datetime_utc > max(energy_hourly.keys()):
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common_end_datetime_utc = max(energy_hourly.keys())
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print("getting common time slot of energy values for all virtual meters...")
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if common_start_datetime_utc is not None and common_end_datetime_utc is not None:
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if energy_virtual_meter_hourly is not None and len(energy_virtual_meter_hourly) > 0:
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for meter_id, energy_hourly in energy_virtual_meter_hourly.items():
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if energy_hourly is None or len(energy_hourly) == 0:
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common_start_datetime_utc = None
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common_end_datetime_utc = None
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break
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else:
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if common_start_datetime_utc < min(energy_hourly.keys()):
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common_start_datetime_utc = min(energy_hourly.keys())
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if common_end_datetime_utc > max(energy_hourly.keys()):
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common_end_datetime_utc = max(energy_hourly.keys())
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print("getting common time slot of energy values for all offline meters...")
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if common_start_datetime_utc is not None and common_end_datetime_utc is not None:
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if energy_offline_meter_hourly is not None and len(energy_offline_meter_hourly) > 0:
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for meter_id, energy_hourly in energy_offline_meter_hourly.items():
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if energy_hourly is None or len(energy_hourly) == 0:
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common_start_datetime_utc = None
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common_end_datetime_utc = None
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break
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else:
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if common_start_datetime_utc < min(energy_hourly.keys()):
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common_start_datetime_utc = min(energy_hourly.keys())
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if common_end_datetime_utc > max(energy_hourly.keys()):
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common_end_datetime_utc = max(energy_hourly.keys())
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print("evaluating the equation with SymPy...")
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normalized_values = list()
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############################################################################################################
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# Converting Strings to SymPy Expressions
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# The sympify function(that’s sympify, not to be confused with simplify) can be used to
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# convert strings into SymPy expressions.
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############################################################################################################
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try:
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expr = sympify(virtual_meter['equation'].lower())
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print("the expression to be evaluated: " + str(expr))
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current_datetime_utc = common_start_datetime_utc
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print("common_start_datetime_utc: " + str(common_start_datetime_utc))
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print("common_end_datetime_utc: " + str(common_end_datetime_utc))
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while common_start_datetime_utc is not None \
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and common_end_datetime_utc is not None \
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and current_datetime_utc <= common_end_datetime_utc:
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meta_data = dict()
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meta_data['start_datetime_utc'] = current_datetime_utc
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####################################################################################################
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# create a dictionary of Symbol: point pairs
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####################################################################################################
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subs = dict()
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####################################################################################################
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# Evaluating the expression at current_datetime_utc
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####################################################################################################
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if meter_list_in_expression is not None and len(meter_list_in_expression) > 0:
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for meter_in_expression in meter_list_in_expression:
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meter_id = str(meter_in_expression['meter_id'])
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actual_value = energy_meter_hourly[meter_id].get(current_datetime_utc, 0.0)
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subs[meter_in_expression['variable_name']] = actual_value
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if virtual_meter_list_in_expression is not None and len(virtual_meter_list_in_expression) > 0:
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for virtual_meter_in_expression in virtual_meter_list_in_expression:
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virtual_meter_id = str(virtual_meter_in_expression['virtual_meter_id'])
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actual_value = energy_virtual_meter_hourly[virtual_meter_id].get(current_datetime_utc, 0.0)
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subs[virtual_meter_in_expression['variable_name']] = actual_value
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if offline_meter_list_in_expression is not None and len(offline_meter_list_in_expression) > 0:
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for offline_meter_in_expression in offline_meter_list_in_expression:
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offline_meter_id = str(offline_meter_in_expression['offline_meter_id'])
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actual_value = energy_offline_meter_hourly[offline_meter_id].get(current_datetime_utc, 0.0)
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subs[offline_meter_in_expression['variable_name']] = actual_value
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####################################################################################################
|
||
# To numerically evaluate an expression with a Symbol at a point,
|
||
# we might use subs followed by evalf,
|
||
# but it is more efficient and numerically stable to pass the substitution to evalf
|
||
# using the subs flag, which takes a dictionary of Symbol: point pairs.
|
||
####################################################################################################
|
||
|
||
meta_data['actual_value'] = expr.evalf(subs=subs)
|
||
|
||
normalized_values.append(meta_data)
|
||
|
||
current_datetime_utc += timedelta(minutes=config.minutes_to_count)
|
||
|
||
except Exception as e:
|
||
if cursor_energy_db:
|
||
cursor_energy_db.close()
|
||
if cnx_energy_db:
|
||
cnx_energy_db.close()
|
||
return "Error in step 4.1 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
|
||
|
||
print("saving energy values to table virtual meter hourly...")
|
||
|
||
if len(normalized_values) > 0:
|
||
try:
|
||
add_values = (" INSERT INTO tbl_virtual_meter_hourly "
|
||
" (virtual_meter_id, start_datetime_utc, actual_value) "
|
||
" VALUES ")
|
||
|
||
for meta_data in normalized_values:
|
||
add_values += " (" + str(virtual_meter['id']) + ","
|
||
add_values += "'" + meta_data['start_datetime_utc'].isoformat()[0:19] + "',"
|
||
add_values += str(meta_data['actual_value']) + "), "
|
||
print("add_values:" + add_values)
|
||
# trim ", " at the end of string and then execute
|
||
cursor_energy_db.execute(add_values[:-2])
|
||
cnx_energy_db.commit()
|
||
except Exception as e:
|
||
if cursor_energy_db:
|
||
cursor_energy_db.close()
|
||
if cnx_energy_db:
|
||
cnx_energy_db.close()
|
||
return "Error in step 4.2 virtual meter worker " + str(e) + " for '" + virtual_meter['name'] + "'"
|
||
|
||
if cursor_energy_db:
|
||
cursor_energy_db.close()
|
||
if cnx_energy_db:
|
||
cnx_energy_db.close()
|
||
|
||
return None
|