myems-aggregation/offline_meter_carbon.py
import time
from datetime import datetime, timedelta
from decimal import Decimal
import mysql.connector
import carbon_dioxide_emmision_factor
import config
########################################################################################################################
# PROCEDURES
# Step 1: get all offline meters
# for each offline meter in list:
# Step 2: get the latest start_datetime_utc
# Step 3: get all energy data since the latest start_datetime_utc
# Step 4: get carbon dioxide emission factor
# Step 5: calculate carbon dioxide emission by multiplying energy with factor
# Step 6: save carbon dioxide emission data to database
########################################################################################################################
def main(logger):
while True:
# the outermost while loop
################################################################################################################
# Step 1: get all offline meters
################################################################################################################
cnx_system_db = None
cursor_system_db = None
try:
cnx_system_db = mysql.connector.connect(**config.myems_system_db)
cursor_system_db = cnx_system_db.cursor()
except Exception as e:
logger.error("Error in step 1.1 of offline_meter_carbon " + str(e))
if cursor_system_db:
cursor_system_db.close()
if cnx_system_db:
cnx_system_db.close()
# sleep and continue the outermost while loop
time.sleep(60)
continue
print("Connected to MyEMS System Database")
offline_meter_list = list()
try:
cursor_system_db.execute(" SELECT id, name, energy_category_id, cost_center_id "
" FROM tbl_offline_meters "
" ORDER BY id ")
rows_offline_meters = cursor_system_db.fetchall()
if rows_offline_meters is None or len(rows_offline_meters) == 0:
print("Step 1.2: There isn't any offline meters. ")
if cursor_system_db:
cursor_system_db.close()
if cnx_system_db:
cnx_system_db.close()
# sleep and continue the outermost while loop
time.sleep(60)
continue
for row in rows_offline_meters:
offline_meter_list.append({"id": row[0],
"name": row[1],
"energy_category_id": row[2],
"cost_center_id": row[3]})
except Exception as e:
logger.error("Error in step 1.2 of offline_meter_carbon " + str(e))
if cursor_system_db:
cursor_system_db.close()
if cnx_system_db:
cnx_system_db.close()
# sleep and continue the outermost while loop
time.sleep(60)
continue
print("Step 1.2: Got all offline meters from MyEMS System Database")
cnx_energy_db = None
cursor_energy_db = None
try:
cnx_energy_db = mysql.connector.connect(**config.myems_energy_db)
cursor_energy_db = cnx_energy_db.cursor()
except Exception as e:
logger.error("Error in step 1.3 of offline_meter_carbon " + str(e))
if cursor_energy_db:
cursor_energy_db.close()
if cnx_energy_db:
cnx_energy_db.close()
if cursor_system_db:
cursor_system_db.close()
if cnx_system_db:
cnx_system_db.close()
# sleep and continue the outermost while loop
time.sleep(60)
continue
print("Connected to MyEMS Energy Database")
cnx_carbon_db = None
cursor_carbon_db = None
try:
cnx_carbon_db = mysql.connector.connect(**config.myems_carbon_db)
cursor_carbon_db = cnx_carbon_db.cursor()
except Exception as e:
logger.error("Error in step 1.4 of offline_meter_carbon " + str(e))
if cursor_carbon_db:
cursor_carbon_db.close()
if cnx_carbon_db:
cnx_carbon_db.close()
if cursor_energy_db:
cursor_energy_db.close()
if cnx_energy_db:
cnx_energy_db.close()
if cursor_system_db:
cursor_system_db.close()
if cnx_system_db:
cnx_system_db.close()
# sleep and continue the outermost while loop
time.sleep(60)
continue
print("Connected to MyEMS Carbon Database")
for offline_meter in offline_meter_list:
############################################################################################################
# Step 2: get the latest start_datetime_utc
############################################################################################################
print("Step 2: get the latest start_datetime_utc from carbon database for " + offline_meter['name'])
try:
cursor_carbon_db.execute(" SELECT MAX(start_datetime_utc) "
" FROM tbl_offline_meter_hourly "
" WHERE offline_meter_id = %s ",
(offline_meter['id'], ))
row_datetime = cursor_carbon_db.fetchone()
start_datetime_utc = datetime.strptime(config.start_datetime_utc, '%Y-%m-%d %H:%M:%S')
start_datetime_utc = start_datetime_utc.replace(minute=0, second=0, microsecond=0, tzinfo=None)
if row_datetime is not None and len(row_datetime) > 0 and isinstance(row_datetime[0], datetime):
# replace second and microsecond with 0
# note: do not replace minute in case of calculating in half hourly
start_datetime_utc = row_datetime[0].replace(second=0, microsecond=0, tzinfo=None)
# start from the next time slot
start_datetime_utc += timedelta(minutes=config.minutes_to_count)
print("start_datetime_utc: " + start_datetime_utc.isoformat()[0:19])
except Exception as e:
logger.error("Error in step 2 of offline_meter_carbon " + str(e))
# break the for offline meter loop
break
############################################################################################################
# Step 3: get all energy data since the latest start_datetime_utc
############################################################################################################
print("Step 3: get all energy data since the latest start_datetime_utc")
try:
query = (" SELECT start_datetime_utc, actual_value "
" FROM tbl_offline_meter_hourly "
" WHERE offline_meter_id = %s AND start_datetime_utc >= %s "
" ORDER BY id ")
cursor_energy_db.execute(query, (offline_meter['id'], start_datetime_utc, ))
rows_hourly = cursor_energy_db.fetchall()
if rows_hourly is None or len(rows_hourly) == 0:
print("Step 3: There isn't any energy input data to calculate. ")
# continue the for offline meter loop
continue
energy_dict = dict()
end_datetime_utc = start_datetime_utc
for row_hourly in rows_hourly:
current_datetime_utc = row_hourly[0]
actual_value = row_hourly[1]
if energy_dict.get(current_datetime_utc) is None:
energy_dict[current_datetime_utc] = dict()
energy_dict[current_datetime_utc][offline_meter['energy_category_id']] = actual_value
if current_datetime_utc > end_datetime_utc:
end_datetime_utc = current_datetime_utc
except Exception as e:
logger.error("Error in step 3 of offline_meter_carbon " + str(e))
# break the for offline meter loop
break
############################################################################################################
# Step 4: get carbon dioxide emission factor
############################################################################################################
print("Step 4: get carbon dioxide emission factor")
factor_dict = dict()
factor_dict[offline_meter['energy_category_id']] = \
carbon_dioxide_emmision_factor.get_energy_category_factor(
offline_meter['energy_category_id'],
start_datetime_utc,
end_datetime_utc)
############################################################################################################
# Step 5: calculate carbon dioxide emission by multiplying energy with factor
############################################################################################################
print("Step 5: calculate carbon dioxide emission by multiplying energy with factor")
aggregated_values = list()
if len(energy_dict) > 0:
for current_datetime_utc in energy_dict.keys():
aggregated_value = dict()
aggregated_value['start_datetime_utc'] = current_datetime_utc
aggregated_value['actual_value'] = None
current_factor = factor_dict[offline_meter['energy_category_id']]
current_energy = energy_dict[current_datetime_utc].get(offline_meter['energy_category_id'])
if current_factor is not None \
and isinstance(current_factor, Decimal) \
and current_energy is not None \
and isinstance(current_energy, Decimal):
aggregated_value['actual_value'] = current_energy * current_factor
aggregated_values.append(aggregated_value)
############################################################################################################
# Step 6: save carbon dioxide emission data to database
############################################################################################################
print("Step 6: save carbon dioxide emission data to database")
while len(aggregated_values) > 0:
insert_100 = aggregated_values[:100]
aggregated_values = aggregated_values[100:]
try:
add_values = (" INSERT INTO tbl_offline_meter_hourly "
" (offline_meter_id, "
" start_datetime_utc, "
" actual_value) "
" VALUES ")
for aggregated_value in insert_100:
if aggregated_value['actual_value'] is not None and \
isinstance(aggregated_value['actual_value'], Decimal):
add_values += " (" + str(offline_meter['id']) + ","
add_values += "'" + aggregated_value['start_datetime_utc'].isoformat()[0:19] + "',"
add_values += str(aggregated_value['actual_value']) + "), "
# trim ", " at the end of string and then execute
cursor_carbon_db.execute(add_values[:-2])
cnx_carbon_db.commit()
except Exception as e:
logger.error("Error in step 6 of offline_meter_carbon " + str(e))
break
# end of for offline meter loop
if cursor_system_db:
cursor_system_db.close()
if cnx_system_db:
cnx_system_db.close()
if cursor_energy_db:
cursor_energy_db.close()
if cnx_energy_db:
cnx_energy_db.close()
if cursor_carbon_db:
cursor_carbon_db.close()
if cnx_carbon_db:
cnx_carbon_db.close()
print("go to sleep 300 seconds...")
time.sleep(300)
print("wake from sleep, and continue to work...")
# end of the outermost while loop