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import logging
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import socket
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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 SocketReader(object):
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BUFFER_SIZE = 256
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def __init__(self, host, port, telegram_specification):
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self.host = host
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self.port = port
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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 remote 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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buffer = b""
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as socket_handle:
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socket_handle.connect((self.host, self.port))
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while True:
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buffer += socket_handle.recv(self.BUFFER_SIZE)
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lines = buffer.splitlines(keepends=True)
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if len(lines) == 0:
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continue
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for data in lines:
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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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buffer = b""
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def read_as_object(self):
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"""
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Read complete DSMR telegram's from remote and return a Telegram object.
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:rtype: generator
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"""
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buffer = b""
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as socket_handle:
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socket_handle.connect((self.host, self.port))
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while True:
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buffer += socket_handle.recv(self.BUFFER_SIZE)
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lines = buffer.splitlines(keepends=True)
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if len(lines) == 0:
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continue
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for data in lines:
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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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buffer = b""
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