299 lines
9.4 KiB
Python
299 lines
9.4 KiB
Python
import abc
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import asyncio
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import struct
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class __InternalProtocol(asyncio.Protocol):
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__reader: asyncio.StreamReader
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def __init__(self, reader: asyncio.StreamReader):
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assert isinstance(reader, asyncio.StreamReader)
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self.__reader = reader
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async def _drain_helper(self):
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pass
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class __InternalTransport(asyncio.WriteTransport):
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__close: bool
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__reader: asyncio.StreamReader
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def __init__(self, reader: asyncio.StreamReader):
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self.__close = False
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assert isinstance(reader, asyncio.StreamReader)
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self.__reader = reader
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def close(self):
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self.__close = True
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self.__reader.feed_eof()
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def is_closing(self):
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return self.__close
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def write(self, data: bytes):
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self.__reader.feed_data(data)
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def write_eof(self):
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self.close()
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def create_internal_stream(loop=None):
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if loop is None:
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loop = asyncio.get_event_loop()
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reader = asyncio.StreamReader(loop=None)
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internal_protocol = __InternalProtocol(reader)
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internal_transport = __InternalTransport(reader)
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writer = asyncio.StreamWriter(
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internal_transport, internal_protocol, reader=reader, loop=loop
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)
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return reader, writer
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class _ConnectionServerProtocol(asyncio.Protocol):
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__writer: asyncio.StreamWriter
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def __init__(self, writer: asyncio.StreamWriter):
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assert isinstance(writer, asyncio.StreamWriter)
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self.__writer = writer
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def _drain_helper(self):
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return self.__writer.drain()
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class _ConnectionServerTransport(asyncio.WriteTransport):
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_close: bool
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__writer: asyncio.StreamWriter
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__id: int
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__format_int = struct.Struct("!I")
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def __init__(self, writer: asyncio.StreamWriter, id: int):
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self._close = False
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assert isinstance(writer, asyncio.StreamWriter)
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self.__writer = writer
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self.__id = id
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def close(self):
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if not self._close:
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self._close = True
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self.__writer.write(b"\x01")
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self.__writer.write(self.__format_int.pack(self.__id))
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def is_closing(self):
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return self._close
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def write(self, data: bytes):
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assert len(data) <= 0xFFFFFFFF
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self.__writer.write(b"\x03")
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self.__writer.write(self.__format_int.pack(self.__id))
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self.__writer.write(self.__format_int.pack(len(data)))
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self.__writer.write(data)
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def write_eof(self):
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self.close()
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class BaseConnectionServer(abc.ABC):
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"""
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Protocol-Init:
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send 32-Bit big-endian: Size of own configuration
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send ...: Configuration data (Future)
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receive 32-Bit big-endian: Size of remote configuration
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receive ...: Remote configuration data (Future)
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send 32-Bit big-endian: Size of own applied configuration
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send ...: Applied configuration
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receive 32-Bit big-endian: Size of remote applied configuration
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receive ...: Remote applied configuration (have to be the same)
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Protocol-configuration: (FUTURE)
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Protocol-applied-configuration: (FUTURE)
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Protocol-Messages:
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receive 8-Bit: Action flag
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Flags:
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- 0: Open substream
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receive 32-Bit big-endian: ID of the stream (ID receiver perspective)
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- 1: Close substream
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receive 32-Bit big-endian: ID of the stream (ID receiver perspective)
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- 2: Close applied
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receive 32-Bit big-endian: ID of the stream (ID receiver perspective)
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- 3: Write substream
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receive 32-Bit big-endian: ID of the stream (ID receiver perspective)
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receive 32-Bit big-endian: Length of content
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receive ...: Content
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IDs:
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0x00000000–0x7FFFFFFF: Own opend streams
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0x80000000–0xFFFFFFFF: Remote opend streams
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"""
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__in: asyncio.StreamReader
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__out: asyncio.StreamWriter
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__free_ids: set
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__next_id = 0
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__streams: dict
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__size_format = struct.Struct("!I")
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__inited = False
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def __close_stream(self, id: int):
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# Close stream
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reader, _, transport = self.__streams[id]
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transport._close = True
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reader.feed_eof()
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# Clean up
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del self.__streams[id]
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if 0x00000000 <= id <= 0x7FFFFFFF:
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self.__free_ids.add(id)
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def __init__(self, in_io: asyncio.StreamReader, out_io: asyncio.StreamWriter):
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if not isinstance(in_io, asyncio.StreamReader):
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raise TypeError("in_io have to be a stream reader.")
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if not isinstance(out_io, asyncio.StreamWriter):
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raise TypeError("out_io have to be a stream writer.")
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self.__in, self.__out = in_io, out_io
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self.__free_ids = set()
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self.__streams = {}
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async def init(self):
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# Check inited
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if self.__inited:
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return
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else:
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self.__inited = True
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# Send own config
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self.__out.write(self.__size_format.pack(0))
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await self.__out.drain()
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# Read other config
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size = self.__size_format.unpack(
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await self.__in.readexactly(self.__size_format.size)
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)[0]
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await self.__in.readexactly(size)
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# Send applied config
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self.__out.write(self.__size_format.pack(0))
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await self.__out.drain()
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# Read other applied config
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size = self.__size_format.unpack(
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await self.__in.readexactly(self.__size_format.size)
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)[0]
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await self.__in.readexactly(size)
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async def open(self):
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# Get id
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if self.__free_ids:
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id = self.__free_ids.pop()
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else:
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id = self.__next_id
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self.__next_id += 1
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assert id <= 0x7FFFFFFF
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remote_id = id | 0x80000000
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# Gen internal
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reader = asyncio.StreamReader(loop=self.__in._loop)
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protocol = _ConnectionServerProtocol(self.__out)
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transport = _ConnectionServerTransport(self.__out, remote_id)
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writer = asyncio.StreamWriter(
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transport, protocol, reader=reader, loop=self.__out._loop
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)
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self.__streams[id] = (reader, writer, transport)
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# Announce new id
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self.__out.write(b"\x00")
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self.__out.write(self.__size_format.pack(remote_id))
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# Return result
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return reader, writer
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@abc.abstractmethod
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async def remote_opend(
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self, read: asyncio.StreamReader, write: asyncio.StreamWriter
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):
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raise NotImplementedError("remote_opend isn't implemented.")
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async def run_server(self):
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# Init
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await self.init()
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# Main loop
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try:
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while True:
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# Read flag
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flag = await self.__in.read(1)
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if not flag:
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break
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else:
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flag = flag[0]
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assert 0 <= flag <= 3
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# Action
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if flag == 0: # Remote open
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# Get id
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id = self.__size_format.unpack(
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await self.__in.readexactly(self.__size_format.size)
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)
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assert 0x80000000 <= id <= 0xFFFFFFFF
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remote_id = id & 0x7FFFFFFF
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# Gen reader and writer
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reader = asyncio.StreamReader(loop=self.__in._loop)
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protocol = _ConnectionServerProtocol(self.__out)
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transport = _ConnectionServerTransport(self.__out, remote_id)
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writer = asyncio.StreamWriter(
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transport, protocol, reader=reader, loop=self.__out._loop
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)
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self.__streams[id] = (reader, writer, transport)
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# Run task
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self.__out._loop.create_task(self.remote_opend(reader, writer))
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elif flag == 1: # Remote closed stream
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# Get id
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id = self.__size_format.unpack(
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await self.__in.readexactly(self.__size_format.size)
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)
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assert 0x00000000 <= id <= 0xFFFFFFFF
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remote_id = id ^ 0x80000000
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# Remove and send applied
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self.__close_stream(id)
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self.__out.write(b"\x02")
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self.__out.write(self.__size_format.pack(remote_id))
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elif flag == 2: # Remote applied closed stream
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# Get id
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id = self.__size_format.unpack(
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await self.__in.readexactly(self.__size_format.size)
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)
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assert 0x00000000 <= id <= 0xFFFFFFFF
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# Close stream
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self.__close_stream(id)
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elif flag == 3: # Receive remote message
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# Get id and size
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tmp = await self.__in.readexactly(self.__size_format.size * 2)
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id = self.__size_format.unpack(tmp[: self.__size_format.size])
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assert 0x00000000 <= id <= 0xFFFFFFFF
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size = self.__size_format.unpack(tmp[self.__size_format.size :])
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# Get data
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data = await self.__in.readexactly(size)
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self.__streams[id][0].feed_data(data)
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else:
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raise ValueError("Unknown flag %i" % flag)
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finally:
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# Close and cleanup
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await self.close()
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async def close(self):
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# Close streams
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for i in list(self.__streams.keys()):
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self.__close_stream(i)
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# Close
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self.__out.write_eof()
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self.__out.close()
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await self.__out.drain()
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