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Viewing changes to scripts/python-console

  • Committer: dilshan_a
  • Date: 2008-01-25 03:39:05 UTC
  • Revision ID: svn-v3-trunk0:2b9c9e99-6f39-0410-b283-7f802c844ae2:trunk:306
Consolidated SolutionError and AttemptError into ScriptExecutionError.

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Lines of Context:
scripts/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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import common.chat
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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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def initializer():
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    interpThread.setDaemon(True)
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    interpThread.start()
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def dispatch_msg(msg):
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    lineQ.put({msg['cmd']:msg['text']})
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    return cmdQ.get()
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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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    common.chat.start_server(port, magic, True, dispatch_msg, initializer)