import dsmr_parser.obis_name_mapping
import datetime
import json
from decimal import Decimal
class Telegram(object):
"""
Container for raw and parsed telegram data.
Initializing:
from dsmr_parser import telegram_specifications
from dsmr_parser.exceptions import InvalidChecksumError, ParseError
from dsmr_parser.objects import CosemObject, MBusObject, Telegram
from dsmr_parser.parsers import TelegramParser
from test.example_telegrams import TELEGRAM_V4_2
parser = TelegramParser(telegram_specifications.V4)
telegram = Telegram(TELEGRAM_V4_2, parser, telegram_specifications.V4)
Attributes can be accessed on a telegram object by addressing by their english name, for example:
telegram.ELECTRICITY_USED_TARIFF_1
All attributes in a telegram can be iterated over, for example:
[k for k,v in telegram]
yields:
['P1_MESSAGE_HEADER', 'P1_MESSAGE_TIMESTAMP', 'EQUIPMENT_IDENTIFIER', ...]
"""
def __init__(self, telegram_data, telegram_parser, telegram_specification):
self._telegram_data = telegram_data
self._telegram_specification = telegram_specification
self._telegram_parser = telegram_parser
self._obis_name_mapping = dsmr_parser.obis_name_mapping.EN
self._reverse_obis_name_mapping = dsmr_parser.obis_name_mapping.REVERSE_EN
self._dictionary = self._telegram_parser.parse(telegram_data)
self._item_names = self._get_item_names()
def __getattr__(self, name):
''' will only get called for undefined attributes '''
obis_reference = self._reverse_obis_name_mapping[name]
value = self._dictionary[obis_reference]
setattr(self, name, value)
return value
def _get_item_names(self):
return [self._obis_name_mapping[k] for k, v in self._dictionary.items()]
def __iter__(self):
for attr in self._item_names:
value = getattr(self, attr)
yield attr, value
def __str__(self):
output = ""
for attr, value in self:
output += "{}: \t {}\n".format(attr, str(value))
return output
def to_json(self):
return json.dumps(dict([[attr, json.loads(value.to_json())] for attr, value in self]))
class DSMRObject(object):
"""
Represents all data from a single telegram line.
"""
def __init__(self, values):
self.values = values
class MBusObject(DSMRObject):
@property
def datetime(self):
return self.values[0]['value']
@property
def value(self):
# TODO temporary workaround for DSMR v2.2. Maybe use the same type of
# TODO object, but let the parse set them differently? So don't use
# TODO hardcoded indexes here.
if len(self.values) != 2: # v2
return self.values[6]['value']
else:
return self.values[1]['value']
@property
def unit(self):
# TODO temporary workaround for DSMR v2.2. Maybe use the same type of
# TODO object, but let the parse set them differently? So don't use
# TODO hardcoded indexes here.
if len(self.values) != 2: # v2
return self.values[5]['value']
else:
return self.values[1]['unit']
def __str__(self):
output = "{}\t[{}] at {}".format(str(self.value), str(self.unit), str(self.datetime.astimezone().isoformat()))
return output
def to_json(self):
timestamp = self.datetime
if isinstance(self.datetime, datetime.datetime):
timestamp = self.datetime.astimezone().isoformat()
value = self.value
if isinstance(self.value, datetime.datetime):
value = self.value.astimezone().isoformat()
if isinstance(self.value, Decimal):
value = float(self.value)
output = {
'datetime': timestamp,
'value': value,
'unit': self.unit
}
return json.dumps(output)
class CosemObject(DSMRObject):
@property
def value(self):
return self.values[0]['value']
@property
def unit(self):
return self.values[0]['unit']
def __str__(self):
print_value = self.value
if isinstance(self.value, datetime.datetime):
print_value = self.value.astimezone().isoformat()
output = "{}\t[{}]".format(str(print_value), str(self.unit))
return output
def to_json(self):
json_value = self.value
if isinstance(self.value, datetime.datetime):
json_value = self.value.astimezone().isoformat()
if isinstance(self.value, Decimal):
json_value = float(self.value)
output = {
'value': json_value,
'unit': self.unit
}
return json.dumps(output)
class ProfileGenericObject(DSMRObject):
"""
Represents all data in a GenericProfile value.
All buffer values are returned as a list of MBusObjects,
containing the datetime (timestamp) and the value.
"""
def __init__(self, values):
super().__init__(values)
self._buffer_list = None
@property
def buffer_length(self):
return self.values[0]['value']
@property
def buffer_type(self):
return self.values[1]['value']
@property
def buffer(self):
if self._buffer_list is None:
self._buffer_list = []
values_offset = 2
for i in range(self.buffer_length):
offset = values_offset + i*2
self._buffer_list.append(MBusObject([self.values[offset], self.values[offset + 1]]))
return self._buffer_list
def __str__(self):
output = "\t buffer length: {}\n".format(self.buffer_length)
output += "\t buffer type: {}".format(self.buffer_type)
for buffer_value in self.buffer:
timestamp = buffer_value.datetime
if isinstance(timestamp, datetime.datetime):
timestamp = str(timestamp.astimezone().isoformat())
output += "\n\t event occured at: {}".format(timestamp)
output += "\t for: {} [{}]".format(buffer_value.value, buffer_value.unit)
return output
def to_json(self):
"""
:return: A json of all values in the GenericProfileObject , with the following structure
{'buffer_length': n,
'buffer_type': obis_ref,
'buffer': [{'datetime': d1,
'value': v1,
'unit': u1},
...
{'datetime': dn,
'value': vn,
'unit': un}
]
}
"""
list = [['buffer_length', self.buffer_length]]
list.append(['buffer_type', self.buffer_type])
buffer_repr = [json.loads(buffer_item.to_json()) for buffer_item in self.buffer]
list.append(['buffer', buffer_repr])
output = dict(list)
return json.dumps(output)
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