179 lines
6.6 KiB
Python
179 lines
6.6 KiB
Python
import logging
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import traceback
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from asyncio import StreamReader, StreamWriter
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from messages import hex_dump_memory
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from typing import Self
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logger = logging.getLogger('conn')
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class AsyncStream():
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def __init__(self, reader: StreamReader, writer: StreamWriter,
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addr) -> None:
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logger.debug('AsyncStream.__init__')
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self.reader = reader
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self.writer = writer
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self.addr = addr
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self.r_addr = ''
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self.l_addr = ''
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async def server_loop(self, addr: str) -> None:
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'''Loop for receiving messages from the inverter (server-side)'''
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logging.info(f'[{self.node_id}] Accept connection from {addr}')
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self.inc_counter('Inverter_Cnt')
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await self.loop()
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self.dec_counter('Inverter_Cnt')
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logging.info(f'[{self.node_id}] Server loop stopped for'
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f' r{self.r_addr}')
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# if the server connection closes, we also have to disconnect
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# the connection to te TSUN cloud
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if self.remoteStream:
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logging.debug("disconnect client connection")
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await self.remoteStream.disc()
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try:
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await self._async_publ_mqtt_proxy_stat('proxy')
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except Exception:
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pass
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async def client_loop(self, addr: str) -> None:
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'''Loop for receiving messages from the TSUN cloud (client-side)'''
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clientStream = await self.remoteStream.loop()
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logging.info(f'[{self.node_id}] Client loop stopped for'
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f' l{clientStream.l_addr}')
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# if the client connection closes, we don't touch the server
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# connection. Instead we erase the client connection stream,
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# thus on the next received packet from the inverter, we can
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# establish a new connection to the TSUN cloud
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# erase backlink to inverter
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clientStream.remoteStream = None
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if self.remoteStream == clientStream:
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# logging.debug(f'Client l{clientStream.l_addr} refs:'
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# f' {gc.get_referrers(clientStream)}')
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# than erase client connection
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self.remoteStream = None
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async def loop(self) -> Self:
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"""Async loop handler for precessing all received messages"""
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self.r_addr = self.writer.get_extra_info('peername')
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self.l_addr = self.writer.get_extra_info('sockname')
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while True:
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try:
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await self.__async_read()
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if self.unique_id:
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await self.async_write()
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await self.__async_forward()
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await self.async_publ_mqtt()
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except OSError as error:
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logger.error(f'[{self.node_id}] {error} for l{self.l_addr} | '
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f'r{self.r_addr}')
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await self.disc()
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self.close()
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return self
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except RuntimeError as error:
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logger.info(f"[{self.node_id}] {error} for {self.l_addr}")
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await self.disc()
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self.close()
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return self
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except Exception:
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self.inc_counter('SW_Exception')
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logger.error(
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f"Exception for {self.addr}:\n"
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f"{traceback.format_exc()}")
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async def async_write(self, headline: str = 'Transmit to ') -> None:
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"""Async write handler to transmit the send_buffer"""
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if self._send_buffer:
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hex_dump_memory(logging.INFO, f'{headline}{self.addr}:',
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self._send_buffer, len(self._send_buffer))
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self.writer.write(self._send_buffer)
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await self.writer.drain()
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self._send_buffer = bytearray(0) # self._send_buffer[sent:]
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async def disc(self) -> None:
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"""Async disc handler for graceful disconnect"""
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if self.writer.is_closing():
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return
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logger.debug(f'AsyncStream.disc() l{self.l_addr} | r{self.r_addr}')
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self.writer.close()
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await self.writer.wait_closed()
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def close(self) -> None:
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"""close handler for a no waiting disconnect
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hint: must be called before releasing the connection instance
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"""
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self.reader.feed_eof() # abort awaited read
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if self.writer.is_closing():
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return
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logger.debug(f'AsyncStream.close() l{self.l_addr} | r{self.r_addr}')
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self.writer.close()
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'''
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Our private methods
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'''
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async def __async_read(self) -> None:
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"""Async read handler to read received data from TCP stream"""
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data = await self.reader.read(4096)
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if data:
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self._recv_buffer += data
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self.read() # call read in parent class
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else:
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raise RuntimeError("Peer closed.")
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async def __async_forward(self) -> None:
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"""forward handler transmits data over the remote connection"""
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if not self._forward_buffer:
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return
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try:
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if not self.remoteStream:
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await self.async_create_remote()
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if self.remoteStream:
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if self.remoteStream._init_new_client_conn():
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await self.remoteStream.async_write()
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if self.remoteStream:
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self.remoteStream._update_header(self._forward_buffer)
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hex_dump_memory(logging.INFO,
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f'Forward to {self.remoteStream.addr}:',
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self._forward_buffer,
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len(self._forward_buffer))
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self.remoteStream.writer.write(self._forward_buffer)
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await self.remoteStream.writer.drain()
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self._forward_buffer = bytearray(0)
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except OSError as error:
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if self.remoteStream:
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rmt = self.remoteStream
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self.remoteStream = None
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logger.error(f'[{rmt.node_id}] Fwd: {error} for '
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f'l{rmt.l_addr} | r{rmt.r_addr}')
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await rmt.disc()
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rmt.close()
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except RuntimeError as error:
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if self.remoteStream:
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rmt = self.remoteStream
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self.remoteStream = None
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logger.info(f"[{rmt.node_id}] Fwd: {error} for {rmt.l_addr}")
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await rmt.disc()
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rmt.close()
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except Exception:
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self.inc_counter('SW_Exception')
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logger.error(
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f"Fwd Exception for {self.addr}:\n"
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f"{traceback.format_exc()}")
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def __del__(self):
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logger.debug(
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f"AsyncStream.__del__ l{self.l_addr} | r{self.r_addr}")
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