#!/usr/local/bin/python

import os,sys
import stat # for chmod constants
import re
import random
import string
import copy
import pickle
import logging
import subprocess
import traceback

from threading import *
from M2Crypto.SSL import SSLError

from emulab_access import access as emulab_access

from util import *
from deter import fedid, generate_fedid
from authorizer import authorizer, abac_authorizer
from service_error import service_error
from remote_service import xmlrpc_handler, soap_handler, service_caller
from proof import proof as access_proof

import httplib
import tempfile
from urlparse import urlparse

from deter import topdl
import list_log
import containers_segment


# Make log messages disappear if noone configures a fedd logger
class nullHandler(logging.Handler):
    def emit(self, record): pass

fl = logging.getLogger("fedd.access")
fl.addHandler(nullHandler())

class access(emulab_access):
    """
    The implementation of access control based on mapping users to projects.

    Users can be mapped to existing projects or have projects created
    dynamically.  This implements both direct requests and proxies.
    """

    max_name_len = 19

    def __init__(self, config=None, auth=None):
        """
        Initializer.  Pulls parameters out of the ConfigParser's access section.
        """
	emulab_access.__init__(self, config, auth)

	self.containerize = config.get('access', 'containerize')

	# Segment creation is where most of the differences are.
	self.start_segment = containers_segment.start_segment
	self.stop_segment = containers_segment.stop_segment
	self.info_segment = containers_segment.info_segment

    # These are subroutines for StartSegment
    def generate_ns2(self, topo, expfn, softdir, connInfo):
	"""
	Benito is expecting a topdl file, so this routine is misnamed.  It does
	clean up the topdl, removing elements containers doesn't understand and
	writing out the file.
	"""
	# Main line of generate_ns2
	t = topo.clone()

	# Weed out the things we aren't going to instantiate: Segments, portal
	# substrates, and portal interfaces.  (The copy in the for loop allows
	# us to delete from e.elements in side the for loop).  While we're
	# touching all the elements, we also adjust paths from the original
	# testbed to local testbed paths 
	for e in [e for e in t.elements]:
	    if isinstance(e, topdl.Segment):
		t.elements.remove(e)
	    if not isinstance(e, topdl.Computer): continue
	    if e.get_attribute('portal'):
		e.set_attribute('containers:node_type', 'embedded_pnode')
	    # Fix software paths
	    for s in getattr(e, 'software', []):
		s.location = re.sub("^.*/", softdir, s.location)

	t.substrates = [ s.clone() for s in t.substrates ]
	t.incorporate_elements()

	# Write it out
	expfile = topdl.topology_to_xml(t, top='experiment')
	try:
	    f = open(expfn, "w")
	    print >>f, expfile
	    f.close()
	except EnvironmentError:
	    raise service_error(service_error.internal,
		    "Cannot write experiment file %s: %s" % (expfn,e))