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Viewing changes to console/python-console

  • Committer: stevenbird
  • Date: 2008-02-01 03:51:56 UTC
  • Revision ID: svn-v3-trunk0:2b9c9e99-6f39-0410-b283-7f802c844ae2:trunk:368
First version of a DTD for XML problem files

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console/python-console
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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 cjson
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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 md5
 
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import os
 
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import Queue
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import signal
14
 
 
15
 
globs = {}
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globs['__builtins__'] = globals()['__builtins__']
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locls = {}
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compiler = codeop.CommandCompiler()
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curr_cmd = ''
20
 
 
21
 
def do_chat(txt):
22
 
    global curr_cmd
23
 
    if curr_cmd == '':
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        curr_cmd = txt
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    else:
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        curr_cmd = curr_cmd + '\n' + txt
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    try:
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        cmd = compiler(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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            web.output(cjson.encode(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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            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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            v = (out.getvalue(), res, None)
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            web.output(cjson.encode(v))
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            curr_cmd = ''
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    except Exception, exc:
 
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import socket
 
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import sys
 
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from threading import Thread
 
16
 
 
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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
 
21
 
 
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    def readline(self):
 
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        # stop the clock!
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24
        signal.alarm(0)
48
 
        v = (None, None, str(exc))
49
 
        web.output(cjson.encode(v))
50
 
        curr_cmd = ''
51
 
 
52
 
urls = (
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    '/',            'index',
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    '/index.html',  'index',
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    '/(.*\.js)',    'jscript',
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    '/(.*\.css)',   'style',
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    '/chat',        'chat')
 
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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)
 
31
            return ln['chat']
 
32
 
 
33
class PythonRunner(Thread):
 
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    def __init__(self, cmdQ, lineQ):
 
35
        self.cmdQ = cmdQ
 
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        self.lineQ = lineQ
 
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        self.out = cStringIO.StringIO()
 
38
        Thread.__init__(self)
 
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40
    def execCmd(self, cmd):
 
41
        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
 
45
            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:
 
52
            signal.alarm(0)
 
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            self.cmdQ.put({"exc":(self.out.getvalue(),str(exc))})
 
54
            self.curr_cmd = ''
 
55
            self.out = cStringIO.StringIO()
 
56
 
 
57
    def run(self):
 
58
        self.init_state()
 
59
        compiler = codeop.CommandCompiler()
 
60
 
 
61
        while True:
 
62
            ln = self.lineQ.get()
 
63
            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))})
 
80
                    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))})
 
90
                    self.curr_cmd = ''
 
91
                    self.out = cStringIO.StringIO()
 
92
 
 
93
    def init_state(self):
 
94
        self.globs = {}
 
95
        self.globs['__builtins__'] = globals()['__builtins__']
 
96
        self.locls = {}
 
97
        self.curr_cmd = ''
 
98
 
 
99
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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111
 
64
 
class index:
65
 
    def GET(self):
66
 
        inp = web.input()
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68
 
        # Authenticate
69
 
        digest = md5.new('hello' + magic).digest().encode('hex')
70
 
        if inp.digest != digest:
71
 
            web.ctx.status = '401 Unauthorized'
72
 
            return
73
 
 
74
 
        # Okay, so the authentication succeeded,
75
 
        # so all we need to do is send back the static
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        # HTML for the console app.
77
 
        web.output(file("index.html", "r").read())
78
 
 
79
 
class jscript:
80
 
    def GET(self, name):
81
 
        web.output(file(name, "r").read())
82
 
 
83
 
class style:
84
 
    def GET(self, name):
85
 
        web.output(file(name, "r").read())
86
 
 
87
 
class chat:
88
 
    def POST(self):
89
 
        inp = web.input()
90
 
        sys.stderr.write(str(inp) + "\n")
91
 
 
92
 
        # Authenticate
93
 
        digest = md5.new(inp.text + magic).digest().encode('hex')
94
 
        if inp.digest != digest:
95
 
            web.ctx.status = '401 Unauthorized'
96
 
            return
97
 
 
98
 
        # Okay, so the authentication succeeded,
99
 
        # so now we have the trivial matter of actually
100
 
        # executing the python....
101
 
        do_chat(inp.text)
 
112
cmdQ = Queue.Queue()
 
113
lineQ = Queue.Queue()
 
114
interpThread = PythonRunner(cmdQ, lineQ)
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115
 
103
116
if __name__ == "__main__":
104
 
    # FIXME jail!
 
117
    port = int(sys.argv[1])
105
118
    magic = sys.argv[2]
106
 
    web.run(urls, globals())
 
119
 
 
120
    # Attempt to open the socket.
 
121
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 
122
    s.bind(('', port))
 
123
    s.listen(1)
 
124
 
 
125
    # Excellent! It worked. Let's turn ourself into a daemon,
 
126
    # then get on with the job of being a python interpreter.
 
127
    daemonize()
 
128
 
 
129
    interpThread.setDaemon(True)
 
130
    interpThread.start()
 
131
 
 
132
    while True:
 
133
        (conn, addr) = s.accept()
 
134
        try:
 
135
            # Grab the input
 
136
            buf = cStringIO.StringIO()
 
137
            blk = conn.recv(1024)
 
138
            while blk:
 
139
                buf.write(blk)
 
140
                try:
 
141
                    blk = conn.recv(1024, socket.MSG_DONTWAIT)
 
142
                except:
 
143
                    # Exception thrown if it WOULD block (but we
 
144
                    # told it not to wait) - ie. we are done
 
145
                    blk = None
 
146
            inp = buf.getvalue()
 
147
            msg = cjson.decode(inp)
 
148
            
 
149
            # Check that the message is 
 
150
            digest = md5.new(msg['text'] + magic).digest().encode('hex')
 
151
            if msg['digest'] != digest:
 
152
                conn.close()
 
153
                continue
 
154
 
 
155
            lineQ.put({msg['cmd']:msg['text']})
 
156
            r = cmdQ.get()
 
157
            conn.sendall(cjson.encode(r))
 
158
            conn.close()
 
159
        except Exception, e:
 
160
            conn.close()