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Viewing changes to console/python-console

  • Committer: stevenbird
  • Date: 2008-02-04 04:22:44 UTC
  • Revision ID: svn-v3-trunk0:2b9c9e99-6f39-0410-b283-7f802c844ae2:trunk:400
first commit of homepage at ivle.sourceforge.net, including screenshots; just web-presence at this stage

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