269 lines
13 KiB
Python
269 lines
13 KiB
Python
import time
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from datetime import datetime, timedelta
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from decimal import Decimal
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import mysql.connector
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import tariff
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import config
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########################################################################################################################
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# PROCEDURES
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# Step 1: get all tenants
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# for each tenant in list:
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# Step 2: get the latest start_datetime_utc
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# Step 3: get all energy input data since the latest start_datetime_utc
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# Step 4: get tariffs
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# Step 5: calculate billing by multiplying energy with tariff
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# Step 6: save billing data to database
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########################################################################################################################
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def main(logger):
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while True:
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# the outermost while loop
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################################################################################################################
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# Step 1: get all tenants
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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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logger.error("Error in step 1.1 of tenant_billing_input_category " + 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 outermost while loop
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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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tenant_list = list()
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try:
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cursor_system_db.execute(" SELECT id, name, cost_center_id "
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" FROM tbl_tenants "
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" ORDER BY id ")
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rows_tenants = cursor_system_db.fetchall()
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if rows_tenants is None or len(rows_tenants) == 0:
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print("Step 1.2: There isn't any tenants. ")
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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 outermost while loop
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time.sleep(60)
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continue
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for row in rows_tenants:
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tenant_list.append({"id": row[0], "name": row[1], "cost_center_id": row[2]})
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except Exception as e:
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logger.error("Error in step 1.2 of tenant_billing_input_category " + 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 outermost while loop
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time.sleep(60)
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continue
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print("Step 1.2: Got all tenants from MyEMS System Database")
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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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logger.error("Error in step 1.3 of tenant_billing_input_category " + str(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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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 outermost while loop
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time.sleep(60)
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continue
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print("Connected to MyEMS Energy Database")
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cnx_billing_db = None
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cursor_billing_db = None
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try:
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cnx_billing_db = mysql.connector.connect(**config.myems_billing_db)
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cursor_billing_db = cnx_billing_db.cursor()
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except Exception as e:
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logger.error("Error in step 1.4 of tenant_billing_input_category " + str(e))
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if cursor_billing_db:
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cursor_billing_db.close()
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if cnx_billing_db:
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cnx_billing_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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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 outermost while loop
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time.sleep(60)
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continue
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print("Connected to MyEMS Billing Database")
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for tenant in tenant_list:
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############################################################################################################
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# Step 2: get the latest start_datetime_utc
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############################################################################################################
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print("Step 2: get the latest start_datetime_utc from billing database for " + tenant['name'])
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try:
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cursor_billing_db.execute(" SELECT MAX(start_datetime_utc) "
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" FROM tbl_tenant_input_category_hourly "
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" WHERE tenant_id = %s ",
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(tenant['id'], ))
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row_datetime = cursor_billing_db.fetchone()
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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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print("start_datetime_utc: " + start_datetime_utc.isoformat()[0:19])
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except Exception as e:
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logger.error("Error in step 2 of tenant_billing_input_category " + str(e))
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# break the for tenant loop
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break
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############################################################################################################
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# Step 3: get all energy input data since the latest start_datetime_utc
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############################################################################################################
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print("Step 3: get all energy input data since the latest start_datetime_utc")
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query = (" SELECT start_datetime_utc, energy_category_id, actual_value "
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" FROM tbl_tenant_input_category_hourly "
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" WHERE tenant_id = %s AND start_datetime_utc >= %s "
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" ORDER BY id ")
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cursor_energy_db.execute(query, (tenant['id'], start_datetime_utc, ))
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rows_hourly = cursor_energy_db.fetchall()
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if rows_hourly is None or len(rows_hourly) == 0:
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print("Step 3: There isn't any energy input data to calculate. ")
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# continue the for tenant loop
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continue
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energy_dict = dict()
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energy_category_list = list()
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end_datetime_utc = start_datetime_utc
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for row_hourly in rows_hourly:
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current_datetime_utc = row_hourly[0]
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energy_category_id = row_hourly[1]
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if energy_category_id not in energy_category_list:
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energy_category_list.append(energy_category_id)
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actual_value = row_hourly[2]
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if energy_dict.get(current_datetime_utc) is None:
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energy_dict[current_datetime_utc] = dict()
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energy_dict[current_datetime_utc][energy_category_id] = actual_value
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if current_datetime_utc > end_datetime_utc:
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end_datetime_utc = current_datetime_utc
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############################################################################################################
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# Step 4: get tariffs
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############################################################################################################
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print("Step 4: get tariffs")
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tariff_dict = dict()
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for energy_category_id in energy_category_list:
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tariff_dict[energy_category_id] = tariff.get_energy_category_tariffs(tenant['cost_center_id'],
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energy_category_id,
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start_datetime_utc,
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end_datetime_utc)
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############################################################################################################
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# Step 5: calculate billing by multiplying energy with tariff
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############################################################################################################
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print("Step 5: calculate billing by multiplying energy with tariff")
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billing_dict = dict()
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if len(energy_dict) > 0:
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for current_datetime_utc in energy_dict.keys():
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billing_dict[current_datetime_utc] = dict()
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for energy_category_id in energy_category_list:
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current_tariff = tariff_dict[energy_category_id].get(current_datetime_utc)
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current_energy = energy_dict[current_datetime_utc].get(energy_category_id)
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if current_tariff is not None \
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and isinstance(current_tariff, Decimal) \
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and current_energy is not None \
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and isinstance(current_energy, Decimal):
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billing_dict[current_datetime_utc][energy_category_id] = \
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current_energy * current_tariff
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if len(billing_dict[current_datetime_utc]) == 0:
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del billing_dict[current_datetime_utc]
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############################################################################################################
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# Step 6: save billing data to billing database
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############################################################################################################
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print("Step 6: save billing data to billing database")
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if len(billing_dict) > 0:
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try:
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add_values = (" INSERT INTO tbl_tenant_input_category_hourly "
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" (tenant_id, "
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" energy_category_id, "
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" start_datetime_utc, "
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" actual_value) "
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" VALUES ")
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for current_datetime_utc in billing_dict:
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for energy_category_id in energy_category_list:
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current_billing = billing_dict[current_datetime_utc].get(energy_category_id)
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if current_billing is not None and isinstance(current_billing, Decimal):
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add_values += " (" + str(tenant['id']) + ","
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add_values += " " + str(energy_category_id) + ","
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add_values += "'" + current_datetime_utc.isoformat()[0:19] + "',"
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add_values += str(billing_dict[current_datetime_utc][energy_category_id]) + "), "
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print("add_values:" + add_values)
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# trim ", " at the end of string and then execute
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cursor_billing_db.execute(add_values[:-2])
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cnx_billing_db.commit()
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except Exception as e:
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logger.error("Error in step 6 of tenant_billing_input_category " + str(e))
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# break the for tenant loop
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break
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# end of for tenant loop
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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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if cursor_billing_db:
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cursor_billing_db.close()
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if cnx_billing_db:
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cnx_billing_db.close()
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print("go to sleep 300 seconds...")
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time.sleep(300)
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print("wake from sleep, and continue to work...")
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# end of the outermost while loop
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