136 lines
5.4 KiB
Python
136 lines
5.4 KiB
Python
import errno
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import sys
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from types import FunctionType
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import eventlet
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from eventlet import greenio
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from eventlet import patcher
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from eventlet.green import select, threading, time
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from eventlet.support import six
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__patched__ = ['call', 'check_call', 'Popen']
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to_patch = [('select', select), ('threading', threading), ('time', time)]
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if sys.version_info > (3, 4):
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from eventlet.green import selectors
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to_patch.append(('selectors', selectors))
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patcher.inject('subprocess', globals(), *to_patch)
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subprocess_orig = patcher.original("subprocess")
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mswindows = sys.platform == "win32"
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if getattr(subprocess_orig, 'TimeoutExpired', None) is None:
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# Backported from Python 3.3.
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# https://bitbucket.org/eventlet/eventlet/issue/89
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class TimeoutExpired(Exception):
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"""This exception is raised when the timeout expires while waiting for
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a child process.
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"""
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def __init__(self, cmd, timeout, output=None):
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self.cmd = cmd
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self.timeout = timeout
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self.output = output
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def __str__(self):
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return ("Command '%s' timed out after %s seconds" %
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(self.cmd, self.timeout))
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# This is the meat of this module, the green version of Popen.
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class Popen(subprocess_orig.Popen):
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"""eventlet-friendly version of subprocess.Popen"""
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# We do not believe that Windows pipes support non-blocking I/O. At least,
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# the Python file objects stored on our base-class object have no
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# setblocking() method, and the Python fcntl module doesn't exist on
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# Windows. (see eventlet.greenio.set_nonblocking()) As the sole purpose of
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# this __init__() override is to wrap the pipes for eventlet-friendly
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# non-blocking I/O, don't even bother overriding it on Windows.
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if not mswindows:
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def __init__(self, args, bufsize=0, *argss, **kwds):
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self.args = args
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# Forward the call to base-class constructor
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subprocess_orig.Popen.__init__(self, args, 0, *argss, **kwds)
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# Now wrap the pipes, if any. This logic is loosely borrowed from
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# eventlet.processes.Process.run() method.
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for attr in "stdin", "stdout", "stderr":
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pipe = getattr(self, attr)
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if pipe is not None and type(pipe) != greenio.GreenPipe:
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# https://github.com/eventlet/eventlet/issues/243
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# AttributeError: '_io.TextIOWrapper' object has no attribute 'mode'
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mode = getattr(pipe, 'mode', '')
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if not mode:
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if pipe.readable():
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mode += 'r'
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if pipe.writable():
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mode += 'w'
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# ValueError: can't have unbuffered text I/O
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if bufsize == 0:
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bufsize = -1
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wrapped_pipe = greenio.GreenPipe(pipe, mode, bufsize)
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setattr(self, attr, wrapped_pipe)
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__init__.__doc__ = subprocess_orig.Popen.__init__.__doc__
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def wait(self, timeout=None, check_interval=0.01):
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# Instead of a blocking OS call, this version of wait() uses logic
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# borrowed from the eventlet 0.2 processes.Process.wait() method.
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if timeout is not None:
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endtime = time.time() + timeout
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try:
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while True:
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status = self.poll()
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if status is not None:
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return status
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if timeout is not None and time.time() > endtime:
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raise TimeoutExpired(self.args, timeout)
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eventlet.sleep(check_interval)
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except OSError as e:
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if e.errno == errno.ECHILD:
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# no child process, this happens if the child process
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# already died and has been cleaned up
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return -1
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else:
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raise
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wait.__doc__ = subprocess_orig.Popen.wait.__doc__
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if not mswindows:
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# don't want to rewrite the original _communicate() method, we
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# just want a version that uses eventlet.green.select.select()
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# instead of select.select().
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_communicate = FunctionType(
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six.get_function_code(six.get_unbound_function(
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subprocess_orig.Popen._communicate)),
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globals())
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try:
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_communicate_with_select = FunctionType(
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six.get_function_code(six.get_unbound_function(
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subprocess_orig.Popen._communicate_with_select)),
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globals())
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_communicate_with_poll = FunctionType(
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six.get_function_code(six.get_unbound_function(
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subprocess_orig.Popen._communicate_with_poll)),
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globals())
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except AttributeError:
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pass
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# Borrow subprocess.call() and check_call(), but patch them so they reference
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# OUR Popen class rather than subprocess.Popen.
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def patched_function(function):
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new_function = FunctionType(six.get_function_code(function), globals())
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if six.PY3:
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new_function.__kwdefaults__ = function.__kwdefaults__
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new_function.__defaults__ = function.__defaults__
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return new_function
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call = patched_function(subprocess_orig.call)
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check_call = patched_function(subprocess_orig.check_call)
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# check_output is Python 2.7+
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if hasattr(subprocess_orig, 'check_output'):
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__patched__.append('check_output')
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check_output = patched_function(subprocess_orig.check_output)
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del patched_function
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