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Viewing changes to console/python-console

  • Committer: William Grant
  • Date: 2009-07-04 11:51:46 UTC
  • mto: (1294.4.2 ui-the-third)
  • mto: This revision was merged to the branch mainline in revision 1353.
  • Revision ID: grantw@unimelb.edu.au-20090704115146-q6bv2b07g9hcyein
Replace all base view __init__s with one at the root that sets the context.

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Lines of Context:
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 sys
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import web
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import md5
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import codeop
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import cjson
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import cgi
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import cStringIO
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import signal
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import Queue
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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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        Thread.__init__(self)
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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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                mode = 
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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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                        # The command was complete,
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                        # so evaluate it!
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                        sys.stdin = StdinFromWeb(self.cmdQ, self.lineQ)
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                        self.out = cStringIO.StringIO()
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                        sys.stdout = out
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                        sys.stderr = out
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                        signal.alarm(5)
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                        res = eval(cmd, globs, 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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                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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            if 'block' in ln:
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                # throw away a partial command.
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                self.curr_cmd = ''
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                try:
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                    cmd = compile(ln['block'], "<web session>", 'exec');
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                    sys.stdin = StdinFromWeb(self.cmdQ, self.lineQ)
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                    self.out = cStringIO.StringIO()
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                    sys.stdout = out
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                    sys.stderr = out
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                    signal.alarm(5)
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                    res = eval(cmd, globs, 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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                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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    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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urls = (
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    '/chat',        'chat',
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    '/block',       'block')
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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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class chat:
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    def POST(self):
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        inp = web.input()
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        # Authenticate
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        digest = md5.new(inp.text + magic).digest().encode('hex')
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        if inp.digest != digest:
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            web.output("401 Unauthorized")
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            web.ctx.status = '401 Unauthorized'
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            return
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        # Okay, so the authentication succeeded,
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        # so now we have the trivial matter of actually
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        # executing the python....
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        lineQ.put({'chat':inp.text})
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        r = cmdQ.get()
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        sys.__stderr__.write(cjson.encode(r) + "\n")
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        web.output(cjson.encode(r))
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class block:
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    def POST(self):
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        inp = web.input()
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        # Authenticate
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        digest = md5.new(inp.text + magic).digest().encode('hex')
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        if inp.digest != digest:
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            web.output("401 Unauthorized")
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            web.ctx.status = '401 Unauthorized'
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            return
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        # Okay, so the authentication succeeded,
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        # so now we have the trivial matter of actually
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        # executing the python....
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        lineQ.put({'block':inp.text})
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        r = cmdQ.get()
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        sys.__stderr__.write(cjson.encode(r) + "\n")
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        web.output(cjson.encode(r))
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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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    magic = sys.argv[2]
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    interpThread.setDaemon(True)
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    interpThread.start()
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    web.run(urls, globals())