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140 lines
3.6 KiB
140 lines
3.6 KiB
#!/usr/bin/env python
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#
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# Copyright (C) 2016 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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import sys
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import asyncio
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from gns3server.utils.asyncio import wait_for_file_creation, wait_for_named_pipe_creation
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from gns3server.compute.error import NodeError
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"""
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This module handle connection to unix socket or Windows named pipe
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"""
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if sys.platform.startswith("win"):
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import win32file
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import win32pipe
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import msvcrt
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class SerialReaderWriterProtocol(asyncio.Protocol):
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def __init__(self):
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self._output = asyncio.StreamReader()
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self._closed = False
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self.transport = None
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def read(self, n=-1):
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return self._output.read(n=n)
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def at_eof(self):
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return self._output.at_eof()
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def write(self, data):
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if self.transport:
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self.transport.write(data)
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async def drain(self):
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pass
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def connection_made(self, transport):
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self.transport = transport
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def data_received(self, data):
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if not self._closed:
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self._output.feed_data(data)
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def close(self):
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self._closed = True
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self._output.feed_eof()
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class WindowsPipe:
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"""
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Write input and output stream to the same object
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"""
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def __init__(self, path):
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self._handle = open(path, "a+b")
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self._pipe = msvcrt.get_osfhandle(self._handle.fileno())
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async def read(self, n=-1):
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(read, num_avail, num_message) = win32pipe.PeekNamedPipe(self._pipe, 0)
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if num_avail > 0:
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(error_code, output) = win32file.ReadFile(self._pipe, num_avail, None)
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return output
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await asyncio.sleep(0.01)
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return b""
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def at_eof(self):
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return False
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def write(self, data):
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win32file.WriteFile(self._pipe, data)
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async def drain(self):
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return
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def close(self):
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pass
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async def _asyncio_open_serial_windows(path):
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"""
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Open a windows named pipe
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:returns: An IO like object
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"""
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try:
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await wait_for_named_pipe_creation(path)
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except asyncio.TimeoutError:
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raise NodeError(f'Pipe file "{path}" is missing')
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return WindowsPipe(path)
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async def _asyncio_open_serial_unix(path):
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"""
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Open a unix socket or a windows named pipe
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:returns: An IO like object
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"""
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try:
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# wait for VM to create the pipe file.
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await wait_for_file_creation(path)
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except asyncio.TimeoutError:
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raise NodeError(f'Pipe file "{path}" is missing')
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output = SerialReaderWriterProtocol()
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try:
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await asyncio.get_event_loop().create_unix_connection(lambda: output, path)
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except ConnectionRefusedError:
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raise NodeError(f'Can\'t open pipe file "{path}"')
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return output
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async def asyncio_open_serial(path):
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"""
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Open a unix socket or a windows named pipe
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:returns: An IO like object
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"""
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if sys.platform.startswith("win"):
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return await _asyncio_open_serial_windows(path)
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else:
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return await _asyncio_open_serial_unix(path)
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