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#!/usr/bin/python
# usage:
# python-console <port> <magic> [<working-dir>]
import cjson
import codeop
import md5
import os
import Queue
import signal
import socket
import sys
from threading import Thread
from functools import partial
import common.chat
class Interrupt(Exception):
def __init__(self):
Exception.__init__(self, "Interrupted!")
class ExpiryTimer(object):
def __init__(self, idle):
self.idle = idle
signal.signal(signal.SIGALRM, partial(self.timeout))
def ping(self):
signal.alarm(self.idle)
def start(self, time):
signal.alarm(time)
def stop(self):
self.ping()
def timeout(self, signum, frame):
sys.exit(1)
class StdinFromWeb(object):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
def readline(self):
self.cmdQ.put({"input":None})
expiry.ping()
ln = self.lineQ.get()
if 'chat' in ln:
return ln['chat']
if 'interrupt' in ln:
raise Interrupt()
class StdoutToWeb(object):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
self.remainder = ''
def write(self, stuff):
# if there's less than 1K, buffer
if len(self.remainder) + len(stuff) < 128:
self.remainder = self.remainder + stuff
return
# Split the content up into lines, and ship all the completed
# lines off to the server.
lines = stuff.split("\n")
lines[0] = self.remainder + lines[0]
self.remainder = lines[-1]
del lines[-1]
if len(lines) > 0:
lines.append('')
text = "\n".join(lines)
self.cmdQ.put({"output":text})
expiry.ping()
ln = self.lineQ.get()
if 'interrupt' in ln:
raise Interrupt()
def flush(self):
if len(self.remainder) > 0:
self.cmdQ.put({"output":self.remainder})
expiry.ping()
ln = self.lineQ.get()
self.remainder = ''
if 'interrupt' in ln:
raise Interrupt()
class PythonRunner(Thread):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
self.stdout = StdoutToWeb(self.cmdQ, self.lineQ)
Thread.__init__(self)
def execCmd(self, cmd):
try:
sys.stdin = StdinFromWeb(self.cmdQ, self.lineQ)
sys.stdout = self.stdout
sys.stderr = self.stdout
res = eval(cmd, self.globs, self.locls)
self.stdout.flush()
self.cmdQ.put({"okay":res})
self.curr_cmd = ''
except Exception, exc:
self.stdout.flush()
self.cmdQ.put({"exc":str(exc)})
self.curr_cmd = ''
def run(self):
self.globs = {}
self.globs['__builtins__'] = globals()['__builtins__']
self.locls = {}
self.curr_cmd = ''
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:
self.stdout.flush()
self.cmdQ.put({"exc":str(exc)})
self.curr_cmd = ''
if 'block' in ln:
# throw away a partial command.
try:
cmd = compile(ln['block'], "<web session>", 'exec');
self.execCmd(cmd)
except Exception, exc:
self.stdout.flush()
self.cmdQ.put({"exc":str(exc)})
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)
# Default expiry time of 15 minutes
expiry = ExpiryTimer(15 * 60)
def initializer():
interpThread.setDaemon(True)
interpThread.start()
expiry.ping()
def dispatch_msg(msg):
expiry.ping()
lineQ.put({msg['cmd']:msg['text']})
return cmdQ.get()
if __name__ == "__main__":
port = int(sys.argv[1])
magic = sys.argv[2]
if len(sys.argv) >= 4:
# working_dir
os.chdir(sys.argv[3])
common.chat.start_server(port, magic, True, dispatch_msg, initializer)
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