Current File : //lib/python3/dist-packages/execnet/gateway.py
# -*- coding: utf-8 -*-
"""
gateway code for initiating popen, socket and ssh connections.
(c) 2004-2013, Holger Krekel and others
"""
import inspect
import linecache
import os
import sys
import textwrap
import types
import execnet
from . import gateway_base
from .gateway_base import Message
importdir = os.path.dirname(os.path.dirname(execnet.__file__))
class Gateway(gateway_base.BaseGateway):
"""Gateway to a local or remote Python Intepreter."""
def __init__(self, io, spec):
super(Gateway, self).__init__(io=io, id=spec.id, _startcount=1)
self.spec = spec
self._initreceive()
@property
def remoteaddress(self):
return self._io.remoteaddress
def __repr__(self):
"""return string representing gateway type and status."""
try:
r = self.hasreceiver() and "receive-live" or "not-receiving"
i = len(self._channelfactory.channels())
except AttributeError:
r = "uninitialized"
i = "no"
return "<{} id={!r} {}, {} model, {} active channels>".format(
self.__class__.__name__, self.id, r, self.execmodel.backend, i
)
def exit(self):
"""trigger gateway exit. Defer waiting for finishing
of receiver-thread and subprocess activity to when
group.terminate() is called.
"""
self._trace("gateway.exit() called")
if self not in self._group:
self._trace("gateway already unregistered with group")
return
self._group._unregister(self)
try:
self._trace("--> sending GATEWAY_TERMINATE")
self._send(Message.GATEWAY_TERMINATE)
self._trace("--> io.close_write")
self._io.close_write()
except (ValueError, EOFError, IOError):
v = sys.exc_info()[1]
self._trace("io-error: could not send termination sequence")
self._trace(" exception: %r" % v)
def reconfigure(self, py2str_as_py3str=True, py3str_as_py2str=False):
"""
set the string coercion for this gateway
the default is to try to convert py2 str as py3 str,
but not to try and convert py3 str to py2 str
"""
self._strconfig = (py2str_as_py3str, py3str_as_py2str)
data = gateway_base.dumps_internal(self._strconfig)
self._send(Message.RECONFIGURE, data=data)
def _rinfo(self, update=False):
"""return some sys/env information from remote."""
if update or not hasattr(self, "_cache_rinfo"):
ch = self.remote_exec(rinfo_source)
try:
self._cache_rinfo = RInfo(ch.receive())
finally:
ch.waitclose()
return self._cache_rinfo
def hasreceiver(self):
"""return True if gateway is able to receive data."""
return self._receivepool.active_count() > 0
def remote_status(self):
"""return information object about remote execution status."""
channel = self.newchannel()
self._send(Message.STATUS, channel.id)
statusdict = channel.receive()
# the other side didn't actually instantiate a channel
# so we just delete the internal id/channel mapping
self._channelfactory._local_close(channel.id)
return RemoteStatus(statusdict)
def remote_exec(self, source, **kwargs):
"""return channel object and connect it to a remote
execution thread where the given ``source`` executes.
* ``source`` is a string: execute source string remotely
with a ``channel`` put into the global namespace.
* ``source`` is a pure function: serialize source and
call function with ``**kwargs``, adding a
``channel`` object to the keyword arguments.
* ``source`` is a pure module: execute source of module
with a ``channel`` in its global namespace
In all cases the binding ``__name__='__channelexec__'``
will be available in the global namespace of the remotely
executing code.
"""
call_name = None
file_name = None
if isinstance(source, types.ModuleType):
file_name = inspect.getsourcefile(source)
linecache.updatecache(file_name)
source = inspect.getsource(source)
elif isinstance(source, types.FunctionType):
call_name = source.__name__
file_name = inspect.getsourcefile(source)
source = _source_of_function(source)
else:
source = textwrap.dedent(str(source))
if not call_name and kwargs:
raise TypeError("can't pass kwargs to non-function remote_exec")
channel = self.newchannel()
self._send(
Message.CHANNEL_EXEC,
channel.id,
gateway_base.dumps_internal((source, file_name, call_name, kwargs)),
)
return channel
def remote_init_threads(self, num=None):
"""DEPRECATED. Is currently a NO-OPERATION already."""
print("WARNING: remote_init_threads()" " is a no-operation in execnet-1.2")
class RInfo:
def __init__(self, kwargs):
self.__dict__.update(kwargs)
def __repr__(self):
info = ", ".join("%s=%s" % item for item in sorted(self.__dict__.items()))
return "<RInfo %r>" % info
RemoteStatus = RInfo
def rinfo_source(channel):
import sys
import os
channel.send(
dict(
executable=sys.executable,
version_info=sys.version_info[:5],
platform=sys.platform,
cwd=os.getcwd(),
pid=os.getpid(),
)
)
def _find_non_builtin_globals(source, codeobj):
import ast
try:
import __builtin__
except ImportError:
import builtins as __builtin__
vars = dict.fromkeys(codeobj.co_varnames)
return [
node.id
for node in ast.walk(ast.parse(source))
if isinstance(node, ast.Name)
and node.id not in vars
and node.id not in __builtin__.__dict__
]
def _source_of_function(function):
if function.__name__ == "<lambda>":
raise ValueError("can't evaluate lambda functions'")
# XXX: we dont check before remote instanciation
# if arguments are used propperly
try:
sig = inspect.getfullargspec(function)
except AttributeError:
args = inspect.getargspec(function)[0]
else:
args = sig.args
if not args or args[0] != "channel":
raise ValueError("expected first function argument to be `channel`")
if gateway_base.ISPY3:
closure = function.__closure__
codeobj = function.__code__
else:
closure = function.func_closure
codeobj = function.func_code
if closure is not None:
raise ValueError("functions with closures can't be passed")
try:
source = inspect.getsource(function)
except IOError:
raise ValueError("can't find source file for %s" % function)
source = textwrap.dedent(source) # just for inner functions
used_globals = _find_non_builtin_globals(source, codeobj)
if used_globals:
raise ValueError("the use of non-builtin globals isn't supported", used_globals)
leading_ws = "\n" * (codeobj.co_firstlineno - 1)
return leading_ws + source
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