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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, InvalidChecksumError
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from dsmr_parser.parsers import TelegramParser
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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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self.telegram_parser = TelegramParser(telegram_specification)
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self.telegram_buffer = TelegramBuffer()
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self.telegram_specification = telegram_specification
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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.read(max(1, min(1024, serial_handle.in_waiting)))
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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 InvalidChecksumError as e:
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logger.warning(str(e))
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except ParseError as e:
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logger.error('Failed to parse telegram: %s', e)
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def read_as_object(self):
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"""
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Read complete DSMR telegram's from the serial interface and return a Telegram object.
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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 InvalidChecksumError as e:
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logger.warning(str(e))
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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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async 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, _ = await 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 = await 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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async def read_as_object(self, queue):
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"""
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Read complete DSMR telegram's from the serial interface
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and return a Telegram object.
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Instead of being a generator, Telegram objects are pushed
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to provided queue for 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, _ = await 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 = await 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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queue.put_nowait(
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self.telegram_parser.parse(telegram)
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)
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except InvalidChecksumError as e:
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logger.warning(str(e))
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except ParseError as e:
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logger.error('Failed to parse telegram: %s', e)
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