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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
import traceback
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()
if 'terminate' in ln:
sys.exit(0)
class StdoutToWeb(object):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
self.remainder = ''
def write(self, stuff):
self.remainder = self.remainder + stuff
# if there's less than 128 bytes, buffer
if len(self.remainder) < 128:
return
# if there's lots, then send it in 1/2K blocks
while len(self.remainder) > 512:
blk = self.remainder[0:512]
self.cmdQ.put({"output":blk})
expiry.ping()
ln = self.lineQ.get()
self.remainder = self.remainder[512:]
# Finally, split the remainder up into lines, and ship all the
# completed lines off to the server.
lines = self.remainder.split("\n")
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 WebIO(object):
"""Provides a file like interface to the Web front end of the console.
You may print text to the console using write(), flush any buffered output
using flush(), or request text from the console using readline()"""
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
self.stdin = StdinFromWeb(self.cmdQ, self.lineQ)
self.stdout = StdoutToWeb(self.cmdQ, self.lineQ)
def write(self, stuff):
self.stdout.write(stuff)
def flush(self):
self.stdout.flush()
def readline(self):
self.stdout.flush()
return self.stdin.readline()
class PythonRunner(Thread):
def __init__(self, cmdQ, lineQ):
self.cmdQ = cmdQ
self.lineQ = lineQ
self.webio = WebIO(self.cmdQ, self.lineQ)
Thread.__init__(self)
def execCmd(self, cmd):
try:
sys.stdin = self.webio
sys.stdout = self.webio
sys.stderr = self.webio
# We don't expect a return value - 'single' symbol prints it.
eval(cmd, self.globs)
self.webio.flush()
self.cmdQ.put({"okay": None})
self.curr_cmd = ''
except:
tb = format_exc_start(start=1)
self.webio.flush()
self.cmdQ.put({"exc": ''.join(tb)})
self.curr_cmd = ''
def run(self):
self.globs = {}
self.globs['__builtins__'] = globals()['__builtins__']
self.curr_cmd = ''
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 = codeop.compile_command(self.curr_cmd, '<web session>')
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:
tb = format_exc_start(start=3)
self.cmdQ.put({"exc": ''.join(tb)})
self.webio.flush()
self.curr_cmd = ''
if 'block' in ln:
# throw away a partial command.
try:
cmd = compile(ln['block'], "<web session>", 'exec');
self.execCmd(cmd)
except:
tb = format_exc_start(start=1)
self.webio.flush()
self.cmdQ.put({"exc": ''.join(tb)})
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()
def format_exc_start(start=0):
etype, value, tb = sys.exc_info()
tbbits = traceback.extract_tb(tb)[start:]
list = ['Traceback (most recent call last):\n']
list = list + traceback.format_list(tbbits)
list = list + traceback.format_exception_only(etype, value)
return ''.join(list)
if __name__ == "__main__":
port = int(sys.argv[1])
magic = sys.argv[2]
if len(sys.argv) >= 4:
# working_dir
os.chdir(sys.argv[3])
# Make python's search path follow the cwd
sys.path[0] = ''
os.environ['HOME'] = sys.argv[3]
common.chat.start_server(port, magic, True, dispatch_msg, initializer)
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