90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
import asyncio
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import logging
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import serial
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import serial_asyncio
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from dsmr_parser.clients.telegram_buffer import TelegramBuffer
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from dsmr_parser.exceptions import ParseError
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from dsmr_parser.parsers import TelegramParser, TelegramParserV2_2, \
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TelegramParserV4
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from dsmr_parser.clients.settings import SERIAL_SETTINGS_V2_2, \
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SERIAL_SETTINGS_V4
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logger = logging.getLogger(__name__)
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class SerialReader(object):
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PORT_KEY = 'port'
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def __init__(self, device, serial_settings, telegram_specification):
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self.serial_settings = serial_settings
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self.serial_settings[self.PORT_KEY] = device
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if serial_settings is SERIAL_SETTINGS_V2_2:
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telegram_parser = TelegramParserV2_2
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elif serial_settings is SERIAL_SETTINGS_V4:
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telegram_parser = TelegramParserV4
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else:
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telegram_parser = TelegramParser
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self.telegram_parser = telegram_parser(telegram_specification)
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self.telegram_buffer = TelegramBuffer()
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def read(self):
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"""
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Read complete DSMR telegram's from the serial interface and parse it
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into CosemObject's and MbusObject's
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:rtype: generator
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"""
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with serial.Serial(**self.serial_settings) as serial_handle:
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while True:
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data = serial_handle.readline()
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self.telegram_buffer.append(data.decode('ascii'))
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for telegram in self.telegram_buffer.get_all():
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try:
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yield self.telegram_parser.parse(telegram)
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except ParseError as e:
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logger.error('Failed to parse telegram: %s', e)
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class AsyncSerialReader(SerialReader):
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"""Serial reader using asyncio pyserial."""
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PORT_KEY = 'url'
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@asyncio.coroutine
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def read(self, queue):
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"""
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Read complete DSMR telegram's from the serial interface and parse it
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into CosemObject's and MbusObject's.
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Instead of being a generator, values are pushed to provided queue for
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asynchronous processing.
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:rtype: None
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"""
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# create Serial StreamReader
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conn = serial_asyncio.open_serial_connection(**self.serial_settings)
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reader, _ = yield from conn
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while True:
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# Read line if available or give control back to loop until new
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# data has arrived.
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data = yield from reader.readline()
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self.telegram_buffer.append(data.decode('ascii'))
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for telegram in self.telegram_buffer.get_all():
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try:
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# Push new parsed telegram onto queue.
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queue.put_nowait(
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self.telegram_parser.parse(telegram)
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)
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except ParseError as e:
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logger.warning('Failed to parse telegram: %s', e)
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