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import errno
import sys
from types import FunctionType
import eventlet
from eventlet import greenio
from eventlet import patcher
from eventlet.green import select, threading, time
import six
__patched__ = ['call', 'check_call', 'Popen']
to_patch = [('select', select), ('threading', threading), ('time', time)]
if sys.version_info > (3, 4):
from eventlet.green import selectors
to_patch.append(('selectors', selectors))
patcher.inject('subprocess', globals(), *to_patch)
subprocess_orig = patcher.original("subprocess")
subprocess_imported = sys.modules.get('subprocess', subprocess_orig)
mswindows = sys.platform == "win32"
if getattr(subprocess_orig, 'TimeoutExpired', None) is None:
# Backported from Python 3.3.
# https://bitbucket.org/eventlet/eventlet/issue/89
class TimeoutExpired(Exception):
"""This exception is raised when the timeout expires while waiting for
a child process.
"""
def __init__(self, cmd, timeout, output=None):
self.cmd = cmd
self.timeout = timeout
self.output = output
def __str__(self):
return ("Command '%s' timed out after %s seconds" %
(self.cmd, self.timeout))
else:
TimeoutExpired = subprocess_imported.TimeoutExpired
# This is the meat of this module, the green version of Popen.
class Popen(subprocess_orig.Popen):
"""eventlet-friendly version of subprocess.Popen"""
# We do not believe that Windows pipes support non-blocking I/O. At least,
# the Python file objects stored on our base-class object have no
# setblocking() method, and the Python fcntl module doesn't exist on
# Windows. (see eventlet.greenio.set_nonblocking()) As the sole purpose of
# this __init__() override is to wrap the pipes for eventlet-friendly
# non-blocking I/O, don't even bother overriding it on Windows.
if not mswindows:
def __init__(self, args, bufsize=0, *argss, **kwds):
self.args = args
# Forward the call to base-class constructor
subprocess_orig.Popen.__init__(self, args, 0, *argss, **kwds)
# Now wrap the pipes, if any. This logic is loosely borrowed from
# eventlet.processes.Process.run() method.
for attr in "stdin", "stdout", "stderr":
pipe = getattr(self, attr)
if pipe is not None and type(pipe) != greenio.GreenPipe:
# https://github.com/eventlet/eventlet/issues/243
# AttributeError: '_io.TextIOWrapper' object has no attribute 'mode'
mode = getattr(pipe, 'mode', '')
if not mode:
if pipe.readable():
mode += 'r'
if pipe.writable():
mode += 'w'
# ValueError: can't have unbuffered text I/O
if bufsize == 0:
bufsize = -1
wrapped_pipe = greenio.GreenPipe(pipe, mode, bufsize)
setattr(self, attr, wrapped_pipe)
__init__.__doc__ = subprocess_orig.Popen.__init__.__doc__
def wait(self, timeout=None, check_interval=0.01):
# Instead of a blocking OS call, this version of wait() uses logic
# borrowed from the eventlet 0.2 processes.Process.wait() method.
if timeout is not None:
endtime = time.time() + timeout
try:
while True:
status = self.poll()
if status is not None:
return status
if timeout is not None and time.time() > endtime:
raise TimeoutExpired(self.args, timeout)
eventlet.sleep(check_interval)
except OSError as e:
if e.errno == errno.ECHILD:
# no child process, this happens if the child process
# already died and has been cleaned up
return -1
else:
raise
wait.__doc__ = subprocess_orig.Popen.wait.__doc__
if not mswindows:
# don't want to rewrite the original _communicate() method, we
# just want a version that uses eventlet.green.select.select()
# instead of select.select().
_communicate = FunctionType(
six.get_function_code(six.get_unbound_function(
subprocess_orig.Popen._communicate)),
globals())
try:
_communicate_with_select = FunctionType(
six.get_function_code(six.get_unbound_function(
subprocess_orig.Popen._communicate_with_select)),
globals())
_communicate_with_poll = FunctionType(
six.get_function_code(six.get_unbound_function(
subprocess_orig.Popen._communicate_with_poll)),
globals())
except AttributeError:
pass
# Borrow subprocess.call() and check_call(), but patch them so they reference
# OUR Popen class rather than subprocess.Popen.
def patched_function(function):
new_function = FunctionType(six.get_function_code(function), globals())
if six.PY3:
new_function.__kwdefaults__ = function.__kwdefaults__
new_function.__defaults__ = function.__defaults__
return new_function
call = patched_function(subprocess_orig.call)
check_call = patched_function(subprocess_orig.check_call)
# check_output is Python 2.7+
if hasattr(subprocess_orig, 'check_output'):
__patched__.append('check_output')
check_output = patched_function(subprocess_orig.check_output)
del patched_function
# Keep exceptions identity.
# https://github.com/eventlet/eventlet/issues/413
CalledProcessError = subprocess_imported.CalledProcessError
del subprocess_imported