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https://github.com/GNS3/gns3-server
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e2ef78a7c4
It should happend only when user try to use another binary and the code of VPCS, dynamips... Will detect it's not the correct binary. For example we detect this error after an user used SupperPutty instead of VPCS. Fix #235
99 lines
3.0 KiB
Python
99 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2015 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 asyncio
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import sys
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@asyncio.coroutine
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def wait_run_in_executor(func, *args):
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"""
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Run blocking code in a different thread and wait
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for the result.
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:param func: Run this function in a different thread
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:param args: Parameters of the function
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:returns: Return the result of the function
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"""
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loop = asyncio.get_event_loop()
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future = loop.run_in_executor(None, func, *args)
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yield from asyncio.wait([future])
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return future.result()
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@asyncio.coroutine
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def subprocess_check_output(*args, cwd=None, env=None):
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"""
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Run a command and capture output
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:param *args: List of command arguments
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:param cwd: Current working directory
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:param env: Command environment
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:returns: Command output
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"""
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proc = yield from asyncio.create_subprocess_exec(*args, stdout=asyncio.subprocess.PIPE, cwd=cwd, env=env)
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output = yield from proc.stdout.read()
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if output is None:
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return ""
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# If we received garbage we ignore invalid characters
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# it should happend only when user try to use another binary
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# and the code of VPCS, dynamips... Will detect it's not the correct binary
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return output.decode("utf-8", errors="ignore")
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@asyncio.coroutine
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def wait_for_process_termination(process, timeout=10):
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"""
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Wait for a process terminate, and raise asyncio.TimeoutError in case of
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timeout.
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In theory this can be implemented by just:
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yield from asyncio.wait_for(self._iou_process.wait(), timeout=100)
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But it's broken before Python 3.4:
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http://bugs.python.org/issue23140
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:param process: An asyncio subprocess
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:param timeout: Timeout in seconds
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"""
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while timeout > 0:
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if process.returncode is not None:
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return
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yield from asyncio.sleep(0.1)
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timeout -= 0.1
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raise asyncio.TimeoutError()
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@asyncio.coroutine
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def _check_process(process, termination_callback):
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if not hasattr(sys, "_called_from_test") or not sys._called_from_test:
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returncode = yield from process.wait()
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if asyncio.iscoroutinefunction(termination_callback):
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yield from termination_callback(returncode)
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else:
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termination_callback(returncode)
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def monitor_process(process, termination_callback):
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"""Call termination_callback when a process dies"""
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asyncio.async(_check_process(process, termination_callback))
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