source: fedd/federation/split.py @ f8ae7aa

#!/usr/local/bin/python

import os,sys
import subprocess
import tempfile
import logging
import topdl

from util import *
from fedid import fedid
from remote_service import xmlrpc_handler, soap_handler
from service_error import *
from authorizer import authorizer


class nullHandler(logging.Handler):
    def emit(self, record): pass

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

class split_local:
    def __init__(self, config=None, auth=None):
        """
        Intialize the various attributes, most from the config object
        """
        self.debug = config.getboolean("splitter", "debug")
        self.muxmax = config.getint("splitter", "muxmax", 3)
        self.tclsh = config.get("splitter", "tclsh", 
                "/usr/local/bin/otclsh")
        self.tcl_splitter = config.get("splitter", "tcl_splitter",
                "/usr/testbed/lib/ns2ir/parse.tcl")
        access_db = config.get("splitter", "accessdb", None)
        allow_any = config.getboolean("splitter", "allow_any", False)

        self.log = logging.getLogger("fedd.splitter")
        set_log_level(config, "splitter", self.log)
        self.trace_file = sys.stderr

        set_log_level(config, "splitter", self.log)

        if auth:
            self.auth= auth
        else:
            self.auth = authorizer()
            self.log.warning("[splitter] No authorizer passed in, " +\
                    "using local one")

        if access_db and allow_any: 
            raise service_error(service_error.internal, 
                    "Cannot specify both an access database and allow_any " +\
                            "for splitter")
        
        if access_db:
            try:
                read_simple_accessdb(access_db, self.auth, 'split')
            except IOError, e:
                raise service_error(service_error.internal,
                        "Error reading accessDB %s: %s" % (access_db, e))
            except ValueError:
                raise service_error(service_error.internal, "%s" % e)
        elif allow_any:
            auth.set_global_attribute("split")


        # Dispatch tables
        self.soap_services = {\
                'Ns2Split': soap_handler("Ns2Split", self.run_splitter),
        }

        self.xmlrpc_services = {\
                'Ns2Split': xmlrpc_handler('Ns2Split', self.run_splitter),
        }

    def run_splitter(self, req, fid):
        """
        The external interface to experiment creation called from the
        dispatcher.

        Creates a working directory, splits the incoming description using the
        splitter script and parses out the avrious subsections using the
        lcasses above.  Once each sub-experiment is created, use pooled threads
        to instantiate them and start it all up.
        """

        if not self.auth.check_attribute(fid, 'split'):
            raise service_error(service_error.access, "Access Denied")

        try:
            tmpdir = tempfile.mkdtemp(prefix="split-")
        except IOError:
            raise service_error(service_error.internal, "Cannot create tmp dir")

        tclfile = tmpdir + "/experiment.tcl"
        pid = "dummy"
        gid = "dummy"
        eid = "dummy"

        req = req.get('Ns2SplitRequestBody', None)
        if not req:
            raise service_error(service_error.req,
                    "Bad request format (no Ns2SplitRequestBody)")
        # The tcl parser needs to read a file so put the content into that file
        descr=req.get('description', None)
        if descr:
            file_content=descr.get('ns2description', None)
            if file_content:
                try:
                    f = open(tclfile, 'w')
                    f.write(file_content)
                    f.close()
                except IOError:
                    raise service_error(service_error.internal,
                            "Cannot write temp experiment description")
            else:
                raise service_error(service_error.req, 
                        "Only ns2descriptions supported")
        else:
            raise service_error(service_error.req, "No description")

        master = req.get('master', None)
        if master == None:
            raise service_error(service_error.req, "No master testbed label")
        
        include_fedkit = req.get('include_fedkit', None)
        if include_fedkit == None:
            raise service_error(service_error.req, 
                    "No federation kit inclusion directive")
        
        
        tclcmd = [self.tclsh, self.tcl_splitter, '-t', '-x', 
            str(self.muxmax), '-m', master]
        if include_fedkit: tclcmd.append('-k')
        tclcmd.extend([pid, gid, eid, tclfile])
        self.log.debug("Calling splitter %s" % " ".join(tclcmd))
        tclparser = subprocess.Popen(tclcmd, stdout=subprocess.PIPE)

        top = topdl.topology_from_xml(file=tclparser.stdout, top="experiment")

        # Walk up tmpdir, deleting as we go
        for path, dirs, files in os.walk(tmpdir, topdown=False):
            for f in files:
                os.remove(os.path.join(path, f))
            for d in dirs:
                os.rmdir(os.path.join(path, d))
        os.rmdir(tmpdir)

        resp = { 
                'experimentdescription':  { 
                    'topdldescription': top.to_dict(),
                    }
                }

        return resp