pyretic.py

#!/usr/bin/python

################################################################################
# The Pyretic Project                                                          #
# frenetic-lang.org/pyretic                                                    #
# author: Joshua Reich (jreich@cs.princeton.edu)                               #
################################################################################
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from pyretic.core.runtime import Runtime
from pyretic.backend.backend import Backend
import sys
import threading
import signal
import subprocess
from importlib import import_module
from optparse import OptionParser
import re
import os
import logging
from multiprocessing import Queue, Process
import pyretic.core.util as util

of_client = None

def signal_handler(signal, frame):
    print '\n----starting pyretic shutdown------'
    # for thread in threading.enumerate():
    #     print (thread,thread.isAlive())
    print "attempting to kill of_client"
    of_client.kill()
    # print "attempting get output of of_client:"
    # output = of_client.communicate()[0]
    # print output
    print "pyretic.py done"
    sys.exit(0)


def parseArgs():
    """Parse command-line args and return options object.
    returns: opts parse options dict"""
    desc = ( 'Pyretic runtime' )
    usage = ( '%prog [options]\n'
              '(type %prog -h for details)' )
    
    end_args = 0
    for arg in sys.argv[1:]:
        if not re.match('-',arg):
            end_args = sys.argv.index(arg)
    kwargs_to_pass = None
    if end_args > 0:
        kwargs_to_pass = sys.argv[end_args+1:]
        sys.argv = sys.argv[:end_args+1]

    op = OptionParser( description=desc, usage=usage )
    op.add_option( '--frontend-only', '-f', action="store_true", 
                     dest="frontend_only", help = 'only start the frontend'  )
    op.add_option( '--mode', '-m', type='choice',
                     choices=['interpreted','i','reactive0','r0','proactive0','p0','proactive1','p1'], 
                     help = '|'.join( ['interpreted/i','reactive0/r0','proactiveN/pN for N={0,1}'] )  )
    op.add_option( '--verbosity', '-v', type='choice',
                   choices=['low','normal','high','please-make-it-stop'],
                   default = 'low',
                   help = '|'.join( ['low','normal','high','please-make-it-stop'] )  )

    op.set_defaults(frontend_only=False,mode='reactive0')
    options, args = op.parse_args()

    return (op, options, args, kwargs_to_pass)


def main():
    global of_client
    (op, options, args, kwargs_to_pass) = parseArgs()
    if options.mode == 'i':
        options.mode = 'interpreted'
    elif options.mode == 'r0':
        options.mode = 'reactive0'
    elif options.mode == 'p0':
        options.mode = 'proactive0'
    elif options.mode == 'p1':
        options.mode = 'proactive1'
    try:
        module_name = args[0]
    except IndexError:
        print 'Module must be specified'
        print ''
        op.print_usage()
        sys.exit(1)
    try:
        module = import_module(module_name)
    except ImportError, e:
        print 'Must be a valid python module'
        print 'e.g, full module name,'
        print '     no .py suffix,'
        print '     located on the system PYTHONPATH'
        print ''
        print 'Exception message for ImportError was:'
        print e
        sys.exit(1)

    main = module.main
    kwargs = { k : v for [k,v] in [ i.lstrip('--').split('=') for i in kwargs_to_pass ]}

    sys.setrecursionlimit(1500) #INCREASE THIS IF "maximum recursion depth exceeded"

    # Set up multiprocess logging.
    verbosity_map = { 'low' : logging.WARNING,
                      'normal' : logging.INFO,
                      'high' : logging.DEBUG,
                      'please-make-it-stop' : logging.DEBUG }
    logging_queue = Queue()

    # Make a logging process.
    def log_writer(queue, log_level):
        formatter = logging.Formatter('%(levelname)s:%(name)s: %(message)s')
        handler = logging.StreamHandler()
        handler.setFormatter(formatter)
        handler.setLevel(log_level)
        logger = logging.getLogger()
        logger.addHandler(handler)
        logger.setLevel(log_level)
        while(True):
            try:
                to_log = queue.get()
            except KeyboardInterrupt, e:
                print "\nkilling log"
                import sys
                sys.exit(0)
            logger.handle(to_log)
    log_level = verbosity_map.get(options.verbosity, logging.DEBUG)
    log_process = Process(target=log_writer,args=(logging_queue, log_level,))
    log_process.daemon = True
    log_process.start()

    # Set default handler.
    logger = logging.getLogger()
    handler = util.QueueStreamHandler(logging_queue)
    logger.addHandler(handler)
    logger.setLevel(log_level)
    
    runtime = Runtime(Backend(),main,kwargs,options.mode,options.verbosity)
    if not options.frontend_only:
        try:
            output = subprocess.check_output('echo $PYTHONPATH',shell=True).strip()
        except:
            print 'Error: Unable to obtain PYTHONPATH'
            sys.exit(1)
        poxpath = None
        for p in output.split(':'):
             if re.match('.*pox/?$',p):
                 poxpath = os.path.abspath(p)
                 break
        if poxpath is None:
            print 'Error: pox not found in PYTHONPATH'
            sys.exit(1)
        pox_exec = os.path.join(poxpath,'pox.py')
        python=sys.executable
        # TODO(josh): pipe pox_client stdout to subprocess.PIPE or
        # other log file descriptor if necessary
        of_client = subprocess.Popen([python, 
                                      pox_exec,
                                      'of_client.pox_client' ],
                                     stdout=sys.stdout,
                                     stderr=subprocess.STDOUT)
    
    signal.signal(signal.SIGINT, signal_handler)
    signal.pause()

if __name__ == '__main__':
    main()