Split up parent and master modules
Knocks 4kb off network footprint for a proxy connection.wip-fakessh-exit-status
David Wilson
6 years ago
parent
5f2fa2cda6
commit
b158259c86
@ -0,0 +1,504 @@
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# Copyright 2017, David Wilson
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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 are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this
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# list of conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors
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# may be used to endorse or promote products derived from this software without
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# specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (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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import re
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import logging
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import os
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import termios
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import signal
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import select
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import getpass
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import time
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import socket
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import inspect
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import textwrap
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import zlib
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import mitogen.core
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from mitogen.core import LOG, IOLOG
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DOCSTRING_RE = re.compile(r'""".+?"""', re.M | re.S)
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COMMENT_RE = re.compile(r'^[ ]*#[^\n]*$', re.M)
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class Argv(object):
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def __init__(self, argv):
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self.argv = argv
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def escape(self, x):
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s = '"'
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for c in x:
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if c in '\\$"`':
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s += '\\'
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s += c
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s += '"'
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return s
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def __str__(self):
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return ' '.join(map(self.escape, self.argv))
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def minimize_source(source):
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subber = lambda match: '""' + ('\n' * match.group(0).count('\n'))
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source = DOCSTRING_RE.sub(subber, source)
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source = COMMENT_RE.sub('', source)
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return source.replace(' ', '\t')
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def flags(names):
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"""Return the result of ORing a set of (space separated) :py:mod:`termios`
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module constants together."""
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return sum(getattr(termios, name) for name in names.split())
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def cfmakeraw(tflags):
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"""Given a list returned by :py:func:`termios.tcgetattr`, return a list
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that has been modified in the same manner as the `cfmakeraw()` C library
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function."""
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iflag, oflag, cflag, lflag, ispeed, ospeed, cc = tflags
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iflag &= ~flags('IGNBRK BRKINT PARMRK ISTRIP INLCR IGNCR ICRNL IXON')
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oflag &= ~flags('OPOST IXOFF')
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lflag &= ~flags('ECHO ECHOE ECHONL ICANON ISIG IEXTEN')
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cflag &= ~flags('CSIZE PARENB')
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cflag |= flags('CS8')
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# TODO: one or more of the above bit twiddles sets or omits a necessary
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# flag. Forcing these fields to zero, as shown below, gets us what we want
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# on Linux/OS X, but it is possibly broken on some other OS.
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iflag = 0
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oflag = 0
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lflag = 0
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return [iflag, oflag, cflag, lflag, ispeed, ospeed, cc]
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def disable_echo(fd):
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old = termios.tcgetattr(fd)
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new = cfmakeraw(old)
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flags = (
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termios.TCSAFLUSH |
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getattr(termios, 'TCSASOFT', 0)
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)
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termios.tcsetattr(fd, flags, new)
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def close_nonstandard_fds():
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for fd in xrange(3, 1024):
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try:
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os.close(fd)
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except OSError:
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pass
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def create_child(*args):
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parentfp, childfp = socket.socketpair()
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pid = os.fork()
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if not pid:
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mitogen.core.set_block(childfp.fileno())
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os.dup2(childfp.fileno(), 0)
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os.dup2(childfp.fileno(), 1)
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childfp.close()
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parentfp.close()
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os.execvp(args[0], args)
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childfp.close()
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# Decouple the socket from the lifetime of the Python socket object.
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fd = os.dup(parentfp.fileno())
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parentfp.close()
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LOG.debug('create_child() child %d fd %d, parent %d, cmd: %s',
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pid, fd, os.getpid(), Argv(args))
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return pid, fd
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def tty_create_child(*args):
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master_fd, slave_fd = os.openpty()
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disable_echo(master_fd)
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disable_echo(slave_fd)
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pid = os.fork()
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if not pid:
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mitogen.core.set_block(slave_fd)
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os.dup2(slave_fd, 0)
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os.dup2(slave_fd, 1)
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os.dup2(slave_fd, 2)
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close_nonstandard_fds()
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os.setsid()
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os.close(os.open(os.ttyname(1), os.O_RDWR))
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os.execvp(args[0], args)
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os.close(slave_fd)
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LOG.debug('tty_create_child() child %d fd %d, parent %d, cmd: %s',
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pid, master_fd, os.getpid(), Argv(args))
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return pid, master_fd
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def write_all(fd, s, deadline=None):
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timeout = None
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written = 0
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while written < len(s):
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if deadline is not None:
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timeout = max(0, deadline - time.time())
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if timeout == 0:
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raise mitogen.core.TimeoutError('write timed out')
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_, wfds, _ = select.select([], [fd], [], timeout)
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if not wfds:
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continue
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n, disconnected = mitogen.core.io_op(os.write, fd, buffer(s, written))
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if disconnected:
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raise mitogen.core.StreamError('EOF on stream during write')
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written += n
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def iter_read(fd, deadline=None):
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bits = []
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timeout = None
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while True:
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if deadline is not None:
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timeout = max(0, deadline - time.time())
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if timeout == 0:
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break
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rfds, _, _ = select.select([fd], [], [], timeout)
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if not rfds:
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continue
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s, disconnected = mitogen.core.io_op(os.read, fd, 4096)
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IOLOG.debug('iter_read(%r) -> %r', fd, s)
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if disconnected or not s:
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raise mitogen.core.StreamError(
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'EOF on stream; last 300 bytes received: %r' %
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(''.join(bits)[-300:],)
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)
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bits.append(s)
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yield s
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raise mitogen.core.TimeoutError('read timed out')
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def discard_until(fd, s, deadline):
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for buf in iter_read(fd, deadline):
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if buf.endswith(s):
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return
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def upgrade_router(econtext):
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if not isinstance(econtext.router, Router): # TODO
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econtext.router.__class__ = Router # TODO
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econtext.router.id_allocator = ChildIdAllocator(econtext.router)
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LOG.debug('_proxy_connect(): constructing ModuleForwarder')
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ModuleForwarder(econtext.router, econtext.parent, econtext.importer)
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def _local_method():
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return mitogen.parent.Stream
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def _ssh_method():
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import mitogen.ssh
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return mitogen.ssh.Stream
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def _sudo_method():
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import mitogen.sudo
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return mitogen.sudo.Stream
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METHOD_NAMES = {
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'local': _local_method,
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'ssh': _ssh_method,
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'sudo': _sudo_method,
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}
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@mitogen.core.takes_econtext
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def _proxy_connect(name, context_id, method_name, kwargs, econtext):
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mitogen.parent.upgrade_router(econtext)
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context = econtext.router._connect(
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context_id,
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METHOD_NAMES[method_name](),
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name=name,
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**kwargs
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)
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return context.name
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class Stream(mitogen.core.Stream):
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"""
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Base for streams capable of starting new slaves.
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"""
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#: The path to the remote Python interpreter.
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python_path = 'python2.7'
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#: True to cause context to write verbose /tmp/mitogen.<pid>.log.
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debug = False
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#: True to cause context to write /tmp/mitogen.stats.<pid>.<thread>.log.
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profiling = False
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def __init__(self, *args, **kwargs):
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super(Stream, self).__init__(*args, **kwargs)
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self.sent_modules = set(['mitogen', 'mitogen.core'])
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self.sent_packages = set(['mitogen'])
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def construct(self, remote_name=None, python_path=None, debug=False,
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profiling=False, **kwargs):
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"""Get the named context running on the local machine, creating it if
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it does not exist."""
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super(Stream, self).construct(**kwargs)
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if python_path:
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self.python_path = python_path
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if remote_name is None:
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remote_name = '%s@%s:%d'
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remote_name %= (getpass.getuser(), socket.gethostname(), os.getpid())
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self.remote_name = remote_name
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self.debug = debug
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self.profiling = profiling
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def on_shutdown(self, broker):
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"""Request the slave gracefully shut itself down."""
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LOG.debug('%r closing CALL_FUNCTION channel', self)
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self.send(
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mitogen.core.Message(
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src_id=mitogen.context_id,
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dst_id=self.remote_id,
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handle=mitogen.core.SHUTDOWN,
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)
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)
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# base64'd and passed to 'python -c'. It forks, dups 0->100, creates a
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# pipe, then execs a new interpreter with a custom argv. 'CONTEXT_NAME' is
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# replaced with the context name. Optimized for size.
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@staticmethod
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def _first_stage():
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import os,sys,zlib
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R,W=os.pipe()
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r,w=os.pipe()
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if os.fork():
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os.dup2(0,100)
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os.dup2(R,0)
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os.dup2(r,101)
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for f in R,r,W,w:os.close(f)
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os.environ['ARGV0']=e=sys.executable
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os.execv(e,['mitogen:CONTEXT_NAME'])
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os.write(1,'EC0\n')
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C=zlib.decompress(sys.stdin.read(input()))
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os.fdopen(W,'w',0).write(C)
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os.fdopen(w,'w',0).write('%s\n'%len(C)+C)
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os.write(1,'EC1\n')
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sys.exit(0)
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def get_boot_command(self):
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source = inspect.getsource(self._first_stage)
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source = textwrap.dedent('\n'.join(source.strip().split('\n')[2:]))
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source = source.replace(' ', '\t')
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source = source.replace('CONTEXT_NAME', self.remote_name)
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encoded = source.encode('zlib').encode('base64').replace('\n', '')
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# We can't use bytes.decode() in 3.x since it was restricted to always
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# return unicode, so codecs.decode() is used instead. In 3.x
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# codecs.decode() requires a bytes object. Since we must be compatible
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# with 2.4 (no bytes literal), an extra .encode() either returns the
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# same str (2.x) or an equivalent bytes (3.x).
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return [
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self.python_path, '-c',
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'from codecs import decode as _;'
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'exec(_(_("%s".encode(),"base64"),"zlib"))' % (encoded,)
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]
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def get_preamble(self):
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parent_ids = mitogen.parent_ids[:]
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parent_ids.insert(0, mitogen.context_id)
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source = inspect.getsource(mitogen.core)
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source += '\nExternalContext().main%r\n' % ((
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parent_ids, # parent_ids
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self.remote_id, # context_id
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self.debug,
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self.profiling,
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LOG.level or logging.getLogger().level or logging.INFO,
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),)
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compressed = zlib.compress(minimize_source(source))
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return str(len(compressed)) + '\n' + compressed
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create_child = staticmethod(create_child)
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def connect(self):
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LOG.debug('%r.connect()', self)
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pid, fd = self.create_child(*self.get_boot_command())
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self.name = 'local.%s' % (pid,)
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self.receive_side = mitogen.core.Side(self, fd)
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self.transmit_side = mitogen.core.Side(self, os.dup(fd))
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LOG.debug('%r.connect(): child process stdin/stdout=%r',
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self, self.receive_side.fd)
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self._connect_bootstrap()
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def _ec0_received(self):
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LOG.debug('%r._ec0_received()', self)
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write_all(self.transmit_side.fd, self.get_preamble())
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discard_until(self.receive_side.fd, 'EC1\n', time.time() + 10.0)
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def _connect_bootstrap(self):
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discard_until(self.receive_side.fd, 'EC0\n', time.time() + 10.0)
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self._ec0_received()
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class ChildIdAllocator(object):
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def __init__(self, router):
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self.router = router
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def allocate(self):
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master = mitogen.core.Context(self.router, 0)
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return master.send_await(
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mitogen.core.Message(dst_id=0, handle=mitogen.core.ALLOCATE_ID)
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)
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class Router(mitogen.core.Router):
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context_class = mitogen.core.Context
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def allocate_id(self):
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return self.id_allocator.allocate()
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def context_by_id(self, context_id, via_id=None):
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context = self._context_by_id.get(context_id)
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if context is None:
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context = self.context_class(self, context_id)
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if via_id is not None:
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context.via = self.context_by_id(via_id)
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self._context_by_id[context_id] = context
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return context
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def _connect(self, context_id, klass, name=None, **kwargs):
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context = self.context_class(self, context_id)
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stream = klass(self, context.context_id, **kwargs)
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if name is not None:
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stream.name = name
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stream.connect()
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context.name = stream.name
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self.register(context, stream)
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return context
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def connect(self, method_name, name=None, **kwargs):
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klass = METHOD_NAMES[method_name]()
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kwargs.setdefault('debug', self.debug)
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kwargs.setdefault('profiling', self.profiling)
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via = kwargs.pop('via', None)
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if via is not None:
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return self.proxy_connect(via, method_name, name=name, **kwargs)
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context_id = self.allocate_id()
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return self._connect(context_id, klass, name=name, **kwargs)
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def proxy_connect(self, via_context, method_name, name=None, **kwargs):
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context_id = self.allocate_id()
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# Must be added prior to _proxy_connect() to avoid a race.
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self.add_route(context_id, via_context.context_id)
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name = via_context.call(_proxy_connect,
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name, context_id, method_name, kwargs
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)
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name = '%s.%s' % (via_context.name, name)
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context = self.context_class(self, context_id, name=name)
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context.via = via_context
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self._context_by_id[context.context_id] = context
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self.propagate_route(context, via_context)
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return context
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class ProcessMonitor(object):
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def __init__(self):
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# pid -> callback()
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self.callback_by_pid = {}
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signal.signal(signal.SIGCHLD, self._on_sigchld)
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def _on_sigchld(self, _signum, _frame):
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for pid, callback in self.callback_by_pid.items():
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pid, status = os.waitpid(pid, os.WNOHANG)
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if pid:
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callback(status)
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del self.callback_by_pid[pid]
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def add(self, pid, callback):
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self.callback_by_pid[pid] = callback
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_instance = None
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@classmethod
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def instance(cls):
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if cls._instance is None:
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cls._instance = cls()
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return cls._instance
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class ModuleForwarder(object):
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"""
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Respond to GET_MODULE requests in a slave by forwarding the request to our
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parent context, or satisfying the request from our local Importer cache.
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"""
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def __init__(self, router, parent_context, importer):
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self.router = router
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self.parent_context = parent_context
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self.importer = importer
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router.add_handler(self._on_get_module, mitogen.core.GET_MODULE)
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def __repr__(self):
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return 'ModuleForwarder(%r)' % (self.router,)
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def _on_get_module(self, msg):
|
||||
LOG.debug('%r._on_get_module(%r)', self, msg)
|
||||
if msg == mitogen.core._DEAD:
|
||||
return
|
||||
|
||||
fullname = msg.data
|
||||
callback = lambda: self._on_cache_callback(msg, fullname)
|
||||
self.importer._request_module(fullname, callback)
|
||||
|
||||
def _send_one_module(self, msg, tup):
|
||||
self.router.route(
|
||||
mitogen.core.Message.pickled(
|
||||
tup,
|
||||
dst_id=msg.src_id,
|
||||
handle=mitogen.core.LOAD_MODULE,
|
||||
)
|
||||
)
|
||||
|
||||
def _on_cache_callback(self, msg, fullname):
|
||||
LOG.debug('%r._on_get_module(): sending %r', self, fullname)
|
||||
tup = self.importer._cache[fullname]
|
||||
if tup is not None:
|
||||
for related in tup[4]:
|
||||
rtup = self.importer._cache[fullname]
|
||||
self._send_one_module(msg, rtup)
|
||||
|
||||
self._send_one_module(msg, tup)
|
||||
Loading…
Reference in New Issue