122 lines
4.1 KiB
Python
122 lines
4.1 KiB
Python
# Copyright (c) 2010, Alexander Cherniuk (ts33kr@gmail.com)
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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#
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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Provides facilities to safely execute expressions inside a shell process
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and capture the resulting output, in an asynchronous fashion, avoiding
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deadlocks. If the process execution time reaches the threshold - it is
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forced to terminate. Consists of a tiny framework and a couple of
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commands as a frontend.
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"""
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from subprocess import Popen, PIPE
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from os.path import expanduser
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from gi.repository import GLib
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from gajim.common.i18n import _
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from gajim.command_system.framework import CommandContainer, command, doc
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from gajim.command_system.implementation.hosts import ChatCommands, PrivateChatCommands, GroupChatCommands
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class Execute(CommandContainer):
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AUTOMATIC = True
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HOSTS = ChatCommands, PrivateChatCommands, GroupChatCommands
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DIRECTORY = "~"
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POLL_INTERVAL = 100
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POLL_COUNT = 5
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@command("exec", raw=True)
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@doc(_("Execute expression inside a shell, show output"))
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def execute(self, expression):
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Execute.spawn(self, expression)
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@classmethod
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def spawn(cls, processor, expression):
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pipes = dict(stdout=PIPE, stderr=PIPE)
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directory = expanduser(cls.DIRECTORY)
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popen = Popen(expression, shell=True, cwd=directory, **pipes)
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cls.monitor(processor, popen)
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@classmethod
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def monitor(cls, processor, popen):
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poller = cls.poller(processor, popen)
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GLib.timeout_add(cls.POLL_INTERVAL, next, poller)
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@classmethod
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def poller(cls, processor, popen):
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for _ in range(cls.POLL_COUNT):
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yield cls.brush(processor, popen)
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cls.overdue(processor, popen)
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yield False
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@classmethod
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def brush(cls, processor, popen):
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if popen.poll() is not None:
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cls.terminated(processor, popen)
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return False
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return True
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@classmethod
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def terminated(cls, processor, popen):
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stdout, stderr = cls.fetch(popen)
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success = popen.returncode == 0
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if success and stdout:
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processor.echo(stdout)
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elif not success and stderr:
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processor.echo_error(stderr)
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@classmethod
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def overdue(cls, processor, popen):
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popen.terminate()
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@classmethod
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def fetch(cls, popen):
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data = popen.communicate()
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return map(cls.clean, data)
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@staticmethod
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def clean(text):
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strip = chr(10) + chr(32)
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return text.decode().strip(strip)
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class Show(Execute):
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@command("sh", raw=True)
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@doc(_("Execute expression inside a shell, send output"))
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def show(self, expression):
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Show.spawn(self, expression)
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@classmethod
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def terminated(cls, processor, popen):
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stdout, stderr = cls.fetch(popen)
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success = popen.returncode == 0
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if success and stdout:
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processor.send(stdout)
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elif not success and stderr:
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processor.echo_error(stderr)
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