import logging
from dsmr_parser.clients.telegram_buffer import TelegramBuffer
from dsmr_parser.exceptions import ParseError, InvalidChecksumError
from dsmr_parser.objects import Telegram
from dsmr_parser.parsers import TelegramParser
logger = logging.getLogger(__name__)
class FileReader(object):
"""
Filereader to read and parse raw telegram strings from a file and instantiate Telegram objects
for each read telegram.
Usage:
from dsmr_parser import telegram_specifications
from dsmr_parser.clients.filereader import FileReader
if __name__== "__main__":
infile = '/data/smartmeter/readings.txt'
file_reader = FileReader(
file = infile,
telegram_specification = telegram_specifications.V4
)
for telegram in file_reader.read_as_object():
print(telegram)
The file can be created like:
from dsmr_parser import telegram_specifications
from dsmr_parser.clients import SerialReader, SERIAL_SETTINGS_V5
if __name__== "__main__":
outfile = '/data/smartmeter/readings.txt'
serial_reader = SerialReader(
device='/dev/ttyUSB0',
serial_settings=SERIAL_SETTINGS_V5,
telegram_specification=telegram_specifications.V4
)
for telegram in serial_reader.read_as_object():
f=open(outfile,"ab+")
f.write(telegram._telegram_data.encode())
f.close()
"""
def __init__(self, file, telegram_specification):
self._file = file
self.telegram_parser = TelegramParser(telegram_specification)
self.telegram_buffer = TelegramBuffer()
self.telegram_specification = telegram_specification
def read_as_object(self):
"""
Read complete DSMR telegram's from a file and return a Telegram object.
:rtype: generator
"""
with open(self._file,"rb") as file_handle:
while True:
data = file_handle.readline()
str = data.decode()
self.telegram_buffer.append(str)
for telegram in self.telegram_buffer.get_all():
try:
yield Telegram(telegram, self.telegram_parser, self.telegram_specification)
except InvalidChecksumError as e:
logger.warning(str(e))
except ParseError as e:
logger.error('Failed to parse telegram: %s', e)