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Mini Shell
Mini Shell
#! /usr/bin/env python
# -*- coding: utf-8 -*-
"""
start socket based minimal readline exec server
it can exeuted in 2 modes of operation
1. as normal script, that listens for new connections
2. via existing_gateway.remote_exec (as imported module)
"""
# this part of the program only executes on the server side
#
import os
import sys
progname = "socket_readline_exec_server-1.2"
def get_fcntl():
try:
import fcntl
except ImportError:
fcntl = None
return fcntl
fcntl = get_fcntl()
debug = 0
if debug: # and not os.isatty(sys.stdin.fileno())
f = open("/tmp/execnet-socket-pyout.log", "w")
old = sys.stdout, sys.stderr
sys.stdout = sys.stderr = f
def print_(*args):
print(" ".join(str(arg) for arg in args))
if sys.version_info > (3, 0):
exec(
"""def exec_(source, locs):
exec(source, locs)"""
)
else:
exec(
"""def exec_(source, locs):
exec source in locs"""
)
def exec_from_one_connection(serversock):
print_(progname, "Entering Accept loop", serversock.getsockname())
clientsock, address = serversock.accept()
print_(progname, "got new connection from %s %s" % address)
clientfile = clientsock.makefile("rb")
print_("reading line")
# rstrip so that we can use \r\n for telnet testing
source = clientfile.readline().rstrip()
clientfile.close()
g = {"clientsock": clientsock, "address": address, "execmodel": execmodel}
source = eval(source)
if source:
co = compile(source + "\n", "<socket server>", "exec")
print_(progname, "compiled source, executing")
try:
exec_(co, g) # noqa
finally:
print_(progname, "finished executing code")
# background thread might hold a reference to this (!?)
# clientsock.close()
def bind_and_listen(hostport, execmodel):
socket = execmodel.socket
if isinstance(hostport, str):
host, port = hostport.split(":")
hostport = (host, int(port))
serversock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# set close-on-exec
if hasattr(fcntl, "FD_CLOEXEC"):
old = fcntl.fcntl(serversock.fileno(), fcntl.F_GETFD)
fcntl.fcntl(serversock.fileno(), fcntl.F_SETFD, old | fcntl.FD_CLOEXEC)
# allow the address to be re-used in a reasonable amount of time
if os.name == "posix" and sys.platform != "cygwin":
serversock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
serversock.bind(hostport)
serversock.listen(5)
return serversock
def startserver(serversock, loop=False):
execute_path = os.getcwd()
try:
while 1:
try:
exec_from_one_connection(serversock)
except (KeyboardInterrupt, SystemExit):
raise
except:
if debug:
import traceback
traceback.print_exc()
else:
excinfo = sys.exc_info()
print_("got exception", excinfo[1])
os.chdir(execute_path)
if not loop:
break
finally:
print_("leaving socketserver execloop")
serversock.shutdown(2)
if __name__ == "__main__":
import sys
if len(sys.argv) > 1:
hostport = sys.argv[1]
else:
hostport = ":8888"
from execnet.gateway_base import get_execmodel
execmodel = get_execmodel("thread")
serversock = bind_and_listen(hostport, execmodel)
startserver(serversock, loop=True)
elif __name__ == "__channelexec__":
chan = globals()["channel"]
execmodel = chan.gateway.execmodel
bindname = chan.receive()
sock = bind_and_listen(bindname, execmodel)
port = sock.getsockname()
chan.send(port)
startserver(sock)
Zerion Mini Shell 1.0