myems /
myems-api
| Conditions | 30 |
| Total Lines | 176 |
| Code Lines | 119 |
| Lines | 0 |
| Ratio | 0 % |
| Changes | 0 | ||
Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.
For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.
Commonly applied refactorings include:
If many parameters/temporary variables are present:
Complex classes like meterrealtime.Reporting.on_get() often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
| 1 | import falcon |
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| 28 | @staticmethod |
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| 29 | def on_get(req, resp): |
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| 30 | print(req.params) |
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| 31 | meter_id = req.params.get('meterid') |
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| 32 | |||
| 33 | ################################################################################################################ |
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| 34 | # Step 1: valid parameters |
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| 35 | ################################################################################################################ |
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| 36 | if meter_id is None: |
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| 37 | raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST', description='API.INVALID_METER_ID') |
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| 38 | else: |
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| 39 | meter_id = str.strip(meter_id) |
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| 40 | if not meter_id.isdigit() or int(meter_id) <= 0: |
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| 41 | raise falcon.HTTPError(falcon.HTTP_400, title='API.BAD_REQUEST', description='API.INVALID_METER_ID') |
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| 42 | |||
| 43 | timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6]) |
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| 44 | if config.utc_offset[0] == '-': |
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| 45 | timezone_offset = -timezone_offset |
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| 46 | |||
| 47 | reporting_end_datetime_utc = datetime.utcnow() |
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| 48 | reporting_start_datetime_utc = reporting_end_datetime_utc - timedelta(minutes=60) |
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| 49 | ################################################################################################################ |
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| 50 | # Step 2: query the meter and energy category |
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| 51 | ################################################################################################################ |
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| 52 | cnx_system = mysql.connector.connect(**config.myems_system_db) |
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| 53 | cursor_system = cnx_system.cursor() |
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| 54 | |||
| 55 | cnx_historical = mysql.connector.connect(**config.myems_historical_db) |
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| 56 | cursor_historical = cnx_historical.cursor() |
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| 57 | |||
| 58 | cursor_system.execute(" SELECT m.id, m.name, m.cost_center_id, m.energy_category_id, " |
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| 59 | " ec.name, ec.unit_of_measure " |
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| 60 | " FROM tbl_meters m, tbl_energy_categories ec " |
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| 61 | " WHERE m.id = %s AND m.energy_category_id = ec.id ", (meter_id,)) |
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| 62 | row_meter = cursor_system.fetchone() |
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| 63 | if row_meter is None: |
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| 64 | if cursor_system: |
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| 65 | cursor_system.close() |
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| 66 | if cnx_system: |
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| 67 | cnx_system.disconnect() |
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| 68 | |||
| 69 | if cursor_historical: |
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| 70 | cursor_historical.close() |
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| 71 | if cnx_historical: |
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| 72 | cnx_historical.disconnect() |
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| 73 | raise falcon.HTTPError(falcon.HTTP_404, title='API.NOT_FOUND', description='API.METER_NOT_FOUND') |
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| 74 | |||
| 75 | meter = dict() |
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| 76 | meter['id'] = row_meter[0] |
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| 77 | meter['name'] = row_meter[1] |
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| 78 | meter['cost_center_id'] = row_meter[2] |
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| 79 | meter['energy_category_id'] = row_meter[3] |
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| 80 | meter['energy_category_name'] = row_meter[4] |
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| 81 | meter['unit_of_measure'] = row_meter[5] |
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| 82 | |||
| 83 | ################################################################################################################ |
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| 84 | # Step 3: query associated points |
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| 85 | ################################################################################################################ |
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| 86 | point_list = list() |
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| 87 | cursor_system.execute(" SELECT p.id, p.name, p.units, p.object_type " |
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| 88 | " FROM tbl_meters m, tbl_meters_points mp, tbl_points p " |
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| 89 | " WHERE m.id = %s AND m.id = mp.meter_id AND mp.point_id = p.id " |
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| 90 | " ORDER BY p.id ", (meter['id'],)) |
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| 91 | rows_points = cursor_system.fetchall() |
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| 92 | if rows_points is not None and len(rows_points) > 0: |
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| 93 | for row in rows_points: |
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| 94 | point_list.append({"id": row[0], "name": row[1], "units": row[2], "object_type": row[3]}) |
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| 95 | |||
| 96 | ################################################################################################################ |
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| 97 | # Step 7: query associated points data |
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| 98 | ################################################################################################################ |
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| 99 | energy_value_data = dict() |
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| 100 | energy_value_data['name'] = None |
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| 101 | energy_value_data['timestamps'] = list() |
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| 102 | energy_value_data['values'] = list() |
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| 103 | |||
| 104 | parameters_data = dict() |
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| 105 | parameters_data['names'] = list() |
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| 106 | parameters_data['timestamps'] = list() |
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| 107 | parameters_data['values'] = list() |
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| 108 | |||
| 109 | for point in point_list: |
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| 110 | point_values = [] |
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| 111 | point_timestamps = [] |
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| 112 | if point['object_type'] == 'ANALOG_VALUE': |
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| 113 | query = (" SELECT utc_date_time, actual_value " |
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| 114 | " FROM tbl_analog_value " |
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| 115 | " WHERE point_id = %s " |
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| 116 | " AND utc_date_time BETWEEN %s AND %s " |
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| 117 | " ORDER BY utc_date_time ") |
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| 118 | cursor_historical.execute(query, (point['id'], |
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| 119 | reporting_start_datetime_utc, |
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| 120 | reporting_end_datetime_utc)) |
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| 121 | rows = cursor_historical.fetchall() |
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| 122 | |||
| 123 | if rows is not None and len(rows) > 0: |
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| 124 | for row in rows: |
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| 125 | current_datetime_local = row[0].replace(tzinfo=timezone.utc) + \ |
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| 126 | timedelta(minutes=timezone_offset) |
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| 127 | current_datetime = current_datetime_local.strftime('%Y-%m-%dT%H:%M:%S') |
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| 128 | point_timestamps.append(current_datetime) |
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| 129 | point_values.append(row[1]) |
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| 130 | |||
| 131 | elif point['object_type'] == 'ENERGY_VALUE': |
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| 132 | energy_value_data['name'] = point['name'] |
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| 133 | query = (" SELECT utc_date_time, actual_value " |
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| 134 | " FROM tbl_energy_value " |
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| 135 | " WHERE point_id = %s " |
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| 136 | " AND utc_date_time BETWEEN %s AND %s " |
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| 137 | " ORDER BY utc_date_time ") |
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| 138 | cursor_historical.execute(query, (point['id'], |
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| 139 | reporting_start_datetime_utc, |
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| 140 | reporting_end_datetime_utc)) |
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| 141 | rows = cursor_historical.fetchall() |
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| 142 | |||
| 143 | if rows is not None and len(rows) > 0: |
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| 144 | |||
| 145 | for row in rows: |
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| 146 | current_datetime_local = row[0].replace(tzinfo=timezone.utc) + \ |
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| 147 | timedelta(minutes=timezone_offset) |
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| 148 | current_datetime = current_datetime_local.strftime('%Y-%m-%dT%H:%M:%S') |
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| 149 | energy_value_data['timestamps'].append(current_datetime) |
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| 150 | energy_value_data['values'].append(row[1]) |
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| 151 | |||
| 152 | elif point['object_type'] == 'DIGITAL_VALUE': |
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| 153 | query = (" SELECT utc_date_time, actual_value " |
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| 154 | " FROM tbl_digital_value " |
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| 155 | " WHERE point_id = %s " |
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| 156 | " AND utc_date_time BETWEEN %s AND %s ") |
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| 157 | cursor_historical.execute(query, (point['id'], |
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| 158 | reporting_start_datetime_utc, |
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| 159 | reporting_end_datetime_utc)) |
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| 160 | rows = cursor_historical.fetchall() |
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| 161 | |||
| 162 | if rows is not None and len(rows) > 0: |
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| 163 | for row in rows: |
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| 164 | current_datetime_local = row[0].replace(tzinfo=timezone.utc) + \ |
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| 165 | timedelta(minutes=timezone_offset) |
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| 166 | current_datetime = current_datetime_local.strftime('%Y-%m-%dT%H:%M:%S') |
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| 167 | point_timestamps.append(current_datetime) |
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| 168 | point_values.append(row[1]) |
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| 169 | |||
| 170 | parameters_data['names'].append(point['name'] + ' (' + point['units'] + ')') |
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| 171 | parameters_data['timestamps'].append(point_timestamps) |
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| 172 | parameters_data['values'].append(point_values) |
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| 173 | |||
| 174 | ################################################################################################################ |
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| 175 | # Step 6: construct the report |
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| 176 | ################################################################################################################ |
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| 177 | if cursor_system: |
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| 178 | cursor_system.close() |
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| 179 | if cnx_system: |
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| 180 | cnx_system.disconnect() |
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| 181 | |||
| 182 | if cursor_historical: |
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| 183 | cursor_historical.close() |
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| 184 | if cnx_historical: |
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| 185 | cnx_historical.disconnect() |
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| 186 | |||
| 187 | result = { |
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| 188 | "meter": { |
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| 189 | "cost_center_id": meter['cost_center_id'], |
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| 190 | "energy_category_id": meter['energy_category_id'], |
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| 191 | "energy_category_name": meter['energy_category_name'], |
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| 192 | "unit_of_measure": meter['unit_of_measure'], |
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| 193 | }, |
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| 194 | "energy_value": energy_value_data, |
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| 195 | "parameters": { |
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| 196 | "names": parameters_data['names'], |
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| 197 | "timestamps": parameters_data['timestamps'], |
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| 198 | "values": parameters_data['values'] |
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| 199 | }, |
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| 200 | |||
| 201 | } |
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| 202 | |||
| 203 | resp.body = json.dumps(result) |
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| 204 |
