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#!/usr/bin/python
# usage:
# python-console <port> <magic>
import cjson
import codeop
import cStringIO
import md5
import os
import Queue
import signal
import socket
import sys
from threading import Thread
class StdinFromWeb(object):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
def readline(self):
# stop the clock!
signal.alarm(0)
self.cmdQ.put({"input":None})
ln = self.lineQ.get()
if 'chat' in ln:
# restart the clock:
# Some of our 5 seconds may have elapsed, but never mind.
signal.alarm(5)
return ln['chat']
class PythonRunner(Thread):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
self.out = cStringIO.StringIO()
Thread.__init__(self)
def execCmd(self, cmd):
try:
sys.stdin = StdinFromWeb(self.cmdQ, self.lineQ)
sys.stdout = self.out
sys.stderr = self.out
signal.alarm(5)
res = eval(cmd, self.globs, self.locls)
signal.alarm(0)
self.cmdQ.put({"okay":(self.out.getvalue(),res)})
self.curr_cmd = ''
self.out = cStringIO.StringIO()
except Exception, exc:
signal.alarm(0)
self.cmdQ.put({"exc":(self.out.getvalue(),str(exc))})
self.curr_cmd = ''
self.out = cStringIO.StringIO()
def run(self):
self.init_state()
compiler = codeop.CommandCompiler()
while True:
ln = self.lineQ.get()
if 'chat' in ln:
if self.curr_cmd == '':
self.curr_cmd = ln['chat']
else:
self.curr_cmd = self.curr_cmd + '\n' + ln['chat']
try:
cmd = compiler(self.curr_cmd)
if cmd is None:
# The command was incomplete,
# so send back a None, so the
# client can print a '...'
self.cmdQ.put({"more":None})
else:
self.execCmd(cmd)
except Exception, exc:
signal.alarm(0)
self.cmdQ.put({"exc":(self.out.getvalue(),str(exc))})
self.curr_cmd = ''
self.out = cStringIO.StringIO()
if 'block' in ln:
# throw away a partial command.
try:
cmd = compile(ln['block'], "<web session>", 'exec');
self.execCmd(cmd)
except Exception, exc:
signal.alarm(0)
self.cmdQ.put({"exc":(self.out.getvalue(),str(exc))})
self.curr_cmd = ''
self.out = cStringIO.StringIO()
def init_state(self):
self.globs = {}
self.globs['__builtins__'] = globals()['__builtins__']
self.locls = {}
self.curr_cmd = ''
def daemonize():
if os.fork(): # launch child and...
os._exit(0) # kill off parent
os.setsid()
if os.fork(): # launch child and...
os._exit(0) # kill off parent again.
os.umask(077)
# The global 'magic' is the secret that the client and server share
# which is used to create and md5 digest to authenticate requests.
# It is assigned a real value at startup.
magic = ''
cmdQ = Queue.Queue()
lineQ = Queue.Queue()
interpThread = PythonRunner(cmdQ, lineQ)
if __name__ == "__main__":
port = int(sys.argv[1])
magic = sys.argv[2]
# Attempt to open the socket.
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind(('', port))
s.listen(1)
# Excellent! It worked. Let's turn ourself into a daemon,
# then get on with the job of being a python interpreter.
daemonize()
interpThread.setDaemon(True)
interpThread.start()
while True:
(conn, addr) = s.accept()
try:
# Grab the input
buf = cStringIO.StringIO()
blk = conn.recv(1024)
while blk:
buf.write(blk)
try:
blk = conn.recv(1024, socket.MSG_DONTWAIT)
except:
# Exception thrown if it WOULD block (but we
# told it not to wait) - ie. we are done
blk = None
inp = buf.getvalue()
msg = cjson.decode(inp)
# Check that the message is
digest = md5.new(msg['text'] + magic).digest().encode('hex')
if msg['digest'] != digest:
conn.close()
continue
lineQ.put({msg['cmd']:msg['text']})
r = cmdQ.get()
conn.sendall(cjson.encode(r))
conn.close()
except Exception, e:
conn.close()
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