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import os, inspect, socket
import sys
from py.magic import autopath ; mypath = autopath()
import py
# the list of modules that must be send to the other side
# for bootstrapping gateways
# XXX we'd like to have a leaner and meaner bootstrap mechanism
startup_modules = [
'py.__.thread.io',
'py.__.execnet.inputoutput',
'py.__.execnet.gateway',
'py.__.execnet.message',
'py.__.execnet.channel',
]
def getsource(dottedname):
mod = __import__(dottedname, None, None, ['__doc__'])
return inspect.getsource(mod)
from py.__.execnet import inputoutput, gateway
class InstallableGateway(gateway.Gateway):
""" initialize gateways on both sides of a inputoutput object. """
def __init__(self, io):
self._remote_bootstrap_gateway(io)
super(InstallableGateway, self).__init__(io=io, _startcount=1)
# XXX we dissallow execution form the other side
self._initreceive(requestqueue=False)
def _remote_bootstrap_gateway(self, io, extra=''):
""" return Gateway with a asynchronously remotely
initialized counterpart Gateway (which may or may not succeed).
Note that the other sides gateways starts enumerating
its channels with even numbers while the sender
gateway starts with odd numbers. This allows to
uniquely identify channels across both sides.
"""
bootstrap = [extra]
bootstrap += [getsource(x) for x in startup_modules]
bootstrap += [io.server_stmt,
"Gateway(io=io, _startcount=2)._servemain()",
]
source = "\n".join(bootstrap)
self._trace("sending gateway bootstrap code")
io.write('%r\n' % source)
class PopenCmdGateway(InstallableGateway):
def __init__(self, cmd):
infile, outfile = os.popen2(cmd)
io = inputoutput.Popen2IO(infile, outfile)
super(PopenCmdGateway, self).__init__(io=io)
class PopenGateway(PopenCmdGateway):
""" This Gateway provides interaction with a newly started
python subprocess.
"""
def __init__(self, python=sys.executable):
""" instantiate a gateway to a subprocess
started with the given 'python' executable.
"""
cmd = '%s -u -c "exec input()"' % python
super(PopenGateway, self).__init__(cmd)
def _remote_bootstrap_gateway(self, io, extra=''):
# have the subprocess use the same PYTHONPATH and py lib
x = py.path.local(py.__file__).dirpath().dirpath()
ppath = os.environ.get('PYTHONPATH', '')
plist = [str(x)] + ppath.split(':')
s = "\n".join([extra,
"import sys ; sys.path[:0] = %r" % (plist,),
"import os ; os.environ['PYTHONPATH'] = %r" % ppath,
str(py.code.Source(stdouterrin_setnull)),
"stdouterrin_setnull()",
""
])
super(PopenGateway, self)._remote_bootstrap_gateway(io, s)
class SocketGateway(InstallableGateway):
""" This Gateway provides interaction with a remote process
by connecting to a specified socket. On the remote
side you need to manually start a small script
(py/execnet/script/socketserver.py) that accepts
SocketGateway connections.
"""
def __init__(self, host, port):
""" instantiate a gateway to a process accessed
via a host/port specified socket.
"""
self.host = host = str(host)
self.port = port = int(port)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host, port))
io = inputoutput.SocketIO(sock)
super(SocketGateway, self).__init__(io=io)
self.remoteaddress = '%s:%d' % (self.host, self.port)
def new_remote(cls, gateway, hostport=None):
""" return a new (connected) socket gateway, instatiated
indirectly through the given 'gateway'.
"""
if hostport is None:
host, port = ('', 0) # XXX works on all platforms?
else:
host, port = hostport
socketserverbootstrap = py.code.Source(
mypath.dirpath('script', 'socketserver.py').read('rU'), """
import socket
sock = bind_and_listen((%r, %r))
port = sock.getsockname()
channel.send(port)
startserver(sock)
""" % (host, port)
)
# execute the above socketserverbootstrap on the other side
channel = gateway.remote_exec(socketserverbootstrap)
(realhost, realport) = channel.receive()
#gateway._trace("new_remote received"
# "port=%r, hostname = %r" %(realport, hostname))
return py.execnet.SocketGateway(host, realport)
new_remote = classmethod(new_remote)
class SshGateway(PopenCmdGateway):
""" This Gateway provides interaction with a remote process,
established via the 'ssh' command line binary.
The remote side needs to have a Python interpreter executable.
"""
def __init__(self, sshaddress, remotepython='python', identity=None):
""" instantiate a remote ssh process with the
given 'sshaddress' and remotepython version.
you may specify an 'identity' filepath.
"""
self.remoteaddress = sshaddress
remotecmd = '%s -u -c "exec input()"' % (remotepython,)
cmdline = [sshaddress, remotecmd]
# XXX Unix style quoting
for i in range(len(cmdline)):
cmdline[i] = "'" + cmdline[i].replace("'", "'\\''") + "'"
cmd = 'ssh -C'
if identity is not None:
cmd += ' -i %s' % (identity,)
cmdline.insert(0, cmd)
super(SshGateway, self).__init__(' '.join(cmdline))
def _remote_bootstrap_gateway(self, io, s=""):
extra = "\n".join([
str(py.code.Source(stdouterrin_setnull)),
"stdouterrin_setnull()",
s,
])
super(SshGateway, self)._remote_bootstrap_gateway(io, extra)
def stdouterrin_setnull():
""" redirect file descriptors 0 and 1 (and possibly 2) to /dev/null.
note that this function may run remotely without py lib support.
"""
# complete confusion (this is independent from the sys.stdout
# and sys.stderr redirection that gateway.remote_exec() can do)
# note that we redirect fd 2 on win too, since for some reason that
# blocks there, while it works (sending to stderr if possible else
# ignoring) on *nix
import sys, os
try:
devnull = os.devnull
except AttributeError:
if os.name == 'nt':
devnull = 'NUL'
else:
devnull = '/dev/null'
# stdin
sys.stdin = os.fdopen(os.dup(0), 'rb', 0)
fd = os.open(devnull, os.O_RDONLY)
os.dup2(fd, 0)
os.close(fd)
# stdout
sys.stdout = os.fdopen(os.dup(1), 'wb', 0)
fd = os.open(devnull, os.O_WRONLY)
os.dup2(fd, 1)
# stderr for win32
if os.name == 'nt':
sys.stderr = os.fdopen(os.dup(2), 'wb', 0)
os.dup2(fd, 2)
os.close(fd)
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