dqm_interfaces.py

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################################################################################
# RelMon: a tool for automatic Release Comparison                              
# https://twiki.cern.ch/twiki/bin/view/CMSPublic/RelMon
#
#
#                                                                              
# Danilo Piparo CERN - danilo.piparo@cern.ch                                   
#                                                                              
################################################################################

from copy import deepcopy
from os import chdir,getcwd,makedirs
from os.path import abspath,exists,join, basename
from re import sub,search
from re import compile as recompile
from sys import exit,stderr,version_info
from threading import Thread,activeCount
from time import sleep
from urllib2  import Request,build_opener,urlopen

import sys
argv=sys.argv
from ROOT import *
import ROOT
sys.argv=argv

gROOT.SetBatch(True)

from authentication import X509CertOpen
from dirstructure import Comparison,Directory,tcanvas_print_processes
from utils import Chi2,KS,BinToBin,Statistical_Tests,literal2root

#-------------------------------------------------------------------------------  

class Error(Exception):
    """Base class for exceptions in this module."""
    pass

class DQM_DB_Communication(Error):
    """Exception occurs in case of problems of communication with the server.
    """
    def __init__(self,msg):
        self.msg = msg

class InvalidNumberOfArguments(Error):

    def __init__(self,msg):
        self.msg = msg
   
#-----------------------------------------------------------------------------    

class DQMcommunicator(object):
  
  """Communicate with the DQM Document server"""
  
  #-----------------------------------------------------------------------------
  
  base_dir='/data/json/archive/'
  
  def __init__(self,
               server,
               is_private=False,
               ident="DQMToJson/1.0 python/%d.%d.%d" % version_info[:3]):
    self.ident = ident
    self.server = server
    self.is_private = is_private
    self.DQMpwd=DQMcommunicator.base_dir
    self.prevDQMpwd=self.DQMpwd
    self.opener=None
    if not self.is_private:
      self.opener=build_opener(X509CertOpen())
  #-----------------------------------------------------------------------------
  
  def open_url(self,url):
    url=url.replace(' ','%20')
    datareq = Request(url)
    datareq.add_header('User-agent', self.ident)    
    url_obj=0
    if not self.is_private:
      url_obj=self.opener.open(datareq)   
      #url_obj=build_opener(X509CertOpen()).open(datareq) 
    else:
      url_obj=urlopen(datareq)
      
    return url_obj
  
  #-----------------------------------------------------------------------------
  
  def get_data(self, full_url):
    #print "getting data from %s" %full_url
    data = self.open_url(full_url).read()
    
    data = sub("-inf", '0', data)
    data = sub("\s+inf", '0', data)
    data = sub("\s+nan", '0', data)
    data = sub('""(CMSSW.*?)""', '"\\1"', data)
   
    return data
  
  #-----------------------------------------------------------------------------

  def ls_url(self, url):
    url=url.replace(" ","%20")
    url=self.server+url
    #print "listing "+url
    form_folder={}
    raw_folder=None
    try:
      raw_folder=eval(self.get_data(url))
    except:
      print "Retrying.."
      for ntrials in xrange(5):
        try:
          if ntrials!=0:
            sleep(2)
          #raw_folder=loads(self.get_data(url))
          raw_folder=eval(self.get_data(url))
          break
        except:
          print "Could not fetch %s. Retrying" %url
        
    #raw_folder=loads(self.get_data(url))
    for content_dict in raw_folder["contents"]:      
      if content_dict.has_key("subdir"):
        form_folder[content_dict["subdir"]]={"type":'dir'}
      elif content_dict.has_key("obj"):
        properties=content_dict["properties"]
        obj_name=content_dict["obj"]
        obj_type=properties["type"]
        obj_kind=properties["kind"]
        obj_as_string=''
        if content_dict.has_key("rootobj"):
          obj_as_string=content_dict["rootobj"]
        form_folder[obj_name]={'type':obj_type,'obj_as_string':obj_as_string,"kind":obj_kind}
    #for k,v in form_folder.items():
      #print "* %s --> %s" %(k,v["type"])
    
    return form_folder        
  
  #-----------------------------------------------------------------------------
 
  def ls(self, url='', fetch_root=False):
    if len(url)==0:
      url=join(self.DQMpwd,url)
    
    form_folder={}   
    
    if fetch_root:
      url='%s?rootcontent=1'%url
    form_folder=self.ls_url(url)

    return form_folder
    
  #-----------------------------------------------------------------------------

  def cd(self, *args):
    len_args=len(args)
    full_url=""
    if len_args!=1 and len_args!=3:
      raise(InvalidNumberOfArguments("3 or 1 args expected!"))
    if len_args==3:
      dataset, run, folder = args    
      full_url='%s/data/json/archive/%s/%s/%s' % (self.server, dataset, run, folder)
    if len_args==1:
      folder=args[0]
      if folder==self.DQMpwd:
        full_url=self.DQMpwd
      elif folder=="..":
        full_url=self.DQMpwd[:self.DQMpwd.rfind("/")]
      elif folder=="-":
        full_url=self.oldDQMpwd
      elif folder=="":
        full_url=DQMcommunicator.base_dir
      else:
        full_url=self.DQMpwd+"/"+folder
        
    full_url=full_url.replace(' ','%20')
    #print "cd: "+full_url
    
    self.oldDQMpwd=self.DQMpwd
    self.DQMpwd=full_url   
    #print "In %s" %self.DQMpwd
  
  #-----------------------------------------------------------------------------
  
  def get_samples(self, samples_string="*"):
    """
    A sample contains, among the other things, a data type, a dataset name 
    and a run.
    """
    full_url='%s/data/json/samples?match=%s' % (self.server, samples_string)
    samples_dict=eval(self.get_data(full_url))
    return samples_dict["samples"]

  #-----------------------------------------------------------------------------
  
  def get_datasets_list(self, dataset_string=""):
    samples_list=self.get_samples(dataset_string)    
    datasets_list=[]
    for sample in samples_list:
      temp_datasets_list =  map(lambda item:item["dataset"] ,sample['items'])
      for temp_dataset in temp_datasets_list:
        if not temp_dataset in datasets_list:
          datasets_list.append(temp_dataset)
    return datasets_list
    
  #-----------------------------------------------------------------------------
    
  def get_RelVal_CMSSW_versions(self,query):
    """Get the available cmssw versions for the relvals.
    """
    relvals_list=self.get_datasets_list(query)
    # The samples are of the form /RelValTHISISMYFAVOURITECHANNEL/CMSSW_VERSION/GEN-SIM-WHATEVER-RECO
    cmssw_versions_with_duplicates=map (lambda x: x.split("/")[2],relvals_list)
    return list(set(cmssw_versions_with_duplicates))
    
  #-----------------------------------------------------------------------------    
    
  def get_runs_list(self, dataset_string):
    slash="/"
    while(dataset_string.endswith(slash) or dataset_string.beginswith(slash)):
      dataset_string=dataset_string.strip("/")
    samples_list=self.get_samples(dataset_string)
    runlist=[]
    # Get all the runs in all the items which are in every sample
    map( lambda sample: map (lambda item: runlist.append(item['run']), sample['items']), samples_list)
    return runlist
  
  #-----------------------------------------------------------------------------  
  
  def get_dataset_runs(self,dataset_string):
    dataset_runs={}
    for dataset in self.get_datasets_list(dataset_string):
      dataset_runs[dataset]=self.get_runs_list(dataset)
    return dataset_runs

  #-----------------------------------------------------------------------------  
  
  def get_common_runs(self,dataset_string1,dataset_string2):
    set1=set(self.get_runs_list(dataset_string1))
    set2=set(self.get_runs_list(dataset_string2))
    set1.intersection_update(set2)
    return list (set2)

  #-----------------------------------------------------------------------------  
  
  def get_root_objects_list(self, url=""):
    if len(url)==0:
      url=self.DQMpwd
    else:
      url="/"+url    
    url = url.replace(" ","%20")
    objects=[]
    for name,description in self.ls(url,True).items():     
      if "dir" not in description["type"]  and "ROOT" in description["kind"]:
        objects.append(literal2root(description["obj_as_string"],description["type"]))
    return objects

  #-----------------------------------------------------------------------------  
  
  def get_root_objects(self, url=""):
    if len(url)==0:
      url=self.DQMpwd
    else:
      url=self.server+"/"+url    
    url = url.replace(" ","%20")
    objects={}
    for name,description in self.ls(url,True).items():     
      if "dir" not in description["type"] and "ROOT" in description["kind"]:
        objects[name]=literal2root(description["obj_as_string"],description["type"])
    return objects

 #-------------------------------------------------------------------------------
  
  def get_root_objects_list_recursive(self, url=""):
    null_url = (len(url)==0)    
    if len(url)==0:
      url=self.DQMpwd
    else:
      url="/"+url    
    url = url.replace(" ","%20")      
    if not null_url: 
      self.cd(url)
    objects=[]
    for name,description in self.ls("",True).items():     
      if "dir" in description["type"]:
        objects+=self.get_root_objects_list_recursive(name)
        self.cd("..")
      elif  "ROOT" in description["kind"]:
        objects.append(literal2root(description["obj_as_string"],description["type"]))
    if not null_url: 
      self.cd("..")
    return objects
    
 #-------------------------------------------------------------------------------
  
  def get_root_objects_names_list_recursive(self, url="",present_url=""):
    null_url = (len(url)==0)
    if (not null_url):
      if len(present_url)==0:
        present_url=url
      else:
        present_url+="_%s"%url
    if len(url)==0:
      url=self.DQMpwd
    else:
      url="/"+url    
    url = url.replace(" ","%20")
    if not null_url:
      self.cd(url)
    objects_names=[]
    for name,description in self.ls("",False).items():     
      if "dir" in description["type"]:        
        objects_names+=self.get_root_objects_names_list_recursive(name,present_url)
        self.cd("..")
      elif  "ROOT" in description["kind"]:
        objects_names.append("%s_%s"%(present_url,name))
    if not null_url: 
      self.cd("..")
    return objects_names
    
 #-------------------------------------------------------------------------------
  
  def get_root_objects_recursive(self, url="",present_url=""):
    null_url = (len(url)==0)
    if (not null_url):
      if len(present_url)==0:
        present_url=url
      else:
        present_url+="_%s"%url
    if len(url)==0:
      url=self.DQMpwd
    else:
      url="/"+url    
    url = url.replace(" ","%20")
    #if not null_url:
    self.cd(url)
    objects={}
    for name,description in self.ls("",True).items():     
      if "dir" in description["type"]:
        objects.update(self.get_root_objects_recursive(name,present_url))
        self.cd("..")
      elif  "ROOT" in description["kind"]:
        objects["%s_%s"%(present_url,name)]=literal2root(description["obj_as_string"],description["type"])
    #if not null_url:
    self.cd("..")
    return objects

#-------------------------------------------------------------------------------

class DirID(object):
  """Structure used to identify a directory in the walked tree,
  It carries the name and depth information.
  """
  def __init__(self,name,depth,mother=""):
    self.name=name
    self.compname=recompile(name)
    self.mother=mother
    self.depth=depth
  def __eq__(self,dirid):
    depth2=dirid.depth
    compname2=dirid.compname
    name2=dirid.name
    is_equal = False
    #if self.name in name2 or name2 in self.name:
    if search(self.compname,name2)!=None or search(compname2,self.name)!=None:
      is_equal = self.depth*depth2 <0 or self.depth==depth2
    if len(self.mother)*(dirid.mother)>0:
      is_equal = is_equal and self.mother==dirid.mother
    return is_equal
    
  def __repr__(self):
    return "Directory %s at level %s" %(self.name,self.depth)
    
#-------------------------------------------------------------------------------
class DirFetcher(Thread):
  """ Fetch the content of the single "directory" in the dqm.
  """
  def __init__ (self,comm,directory):
      Thread.__init__(self)
      self.comm = comm
      self.directory = directory
      self.contents=None    
  def run(self):
    self.contents = self.comm.ls(self.directory,True)

#-------------------------------------------------------------------------------

class DirWalkerDB(Thread):
  """An interface to the DQM document db. It is threaded to compensate the 
  latency introduced by the finite response time of the server.
  """
  def __init__ (self,comm1,comm2,base1,base2,directory,depth=0,do_pngs=True,stat_test="KS",test_threshold=.5,black_list=[]):
    Thread.__init__(self)
    self.comm1 = deepcopy(comm1)
    self.comm2 = deepcopy(comm2)
    self.base1,self.base2 = base1,base2
    self.directory = directory
    self.depth=depth
    self.do_pngs=do_pngs
    self.test_threshold=test_threshold
    self.stat_test=stat_test
    self.black_list=black_list
    # name of the thread
    self.name+="_%s" %directory.name
  
  def run(self):
    
    this_dir=DirID(self.directory.name,self.depth)
    if this_dir in self.black_list: 
      print "Skipping %s since blacklisted!" %this_dir
      return 0 
    
    self.depth+=1
    
    the_test=Statistical_Tests[self.stat_test](self.test_threshold)
    #print "Test %s with threshold %s" %(self.stat_test,self.test_threshold)
    
    directory1=self.base1+"/"+self.directory.mother_dir+"/"+self.directory.name
    directory2=self.base2+"/"+self.directory.mother_dir+"/"+self.directory.name
    
    fetchers =(DirFetcher(self.comm1,directory1),DirFetcher(self.comm2,directory2))
    for fetcher in fetchers:
      fetcher.start()
    for fetcher in fetchers:  
      fetcher.join()
    
    contents1 = fetchers[0].contents
    contents2 = fetchers[1].contents
    set1= set(contents1.keys())
    set2= set(contents2.keys())  
    
    walkers=[]
    self_directory_directories=self.directory.subdirs
    self_directory_comparisons=self.directory.comparisons
    contents_names=list(set1.intersection(set2))

    for name in contents_names:
      content = contents1[name]
      if "dir" in content["type"]:
        #if this_dir not in DirWalker.white_list:continue              
        subdir=Directory(name,join(self.directory.mother_dir,self.directory.name))        
        dirwalker=DirWalkerDB(self.comm1,self.comm2,self.base1,self.base2,subdir,self.depth,
                              self.do_pngs,self.stat_test,self.test_threshold,self.black_list)
        dirwalker.start()
        walkers.append(dirwalker)
        n_threads=activeCount()
        if n_threads>5:
          #print >> stderr, "Threads that are running: %s. Joining them." %(n_threads)    
          dirwalker.join()
      elif content["kind"]=="ROOT":
#   print directory1,name
        comparison=Comparison(name,
                              join(self.directory.mother_dir,self.directory.name),
                              literal2root(content["obj_as_string"],content["type"]),
                              literal2root(contents2[name]["obj_as_string"],content["type"]),
                              deepcopy(the_test),
                              do_pngs=self.do_pngs)
        self_directory_comparisons.append(comparison)
    
    
    for walker in walkers:
      walker.join()
      walker_directory=walker.directory
      if not walker_directory.is_empty():
        self_directory_directories.append(walker_directory)
        
#-------------------------------------------------------------------------------

class DQMRootFile(object):
  """ Class acting as interface between the user and the harvested DQMRootFile.  
  It skips the directories created by the DQM infrastructure so to provide an
  interface as similar as possible to a real direcory structure and to the 
  directory structure provided by the db interface.
  """
  def __init__(self,rootfilename):
    dqmdatadir="DQMData"
    self.rootfile=TFile(rootfilename)  
    self.rootfilepwd=self.rootfile.GetDirectory(dqmdatadir)
    self.rootfileprevpwd=self.rootfile.GetDirectory(dqmdatadir)
    if self.rootfilepwd == None:
      print "Directory %s does not exist: skipping. Is this a custom rootfile?" %dqmdatadir
      self.rootfilepwd=self.rootfile
      self.rootfileprevpwd=self.rootfile
  
  def __is_null(self,directory,name):
    is_null = not directory
    if is_null:
        print >> stderr, "Directory %s does not exist!" %name
    return is_null

  def ls(self,directory_name=""):
    contents={}
    directory=None
    if len(directory_name)==0:
      directory=self.rootfilepwd      
    
    directory=self.rootfilepwd.GetDirectory(directory_name)    
    if self.__is_null(directory,directory_name):
      return contents
    
    for key in directory.GetListOfKeys():
      contents[key.GetName()]=key.GetClassName()
    return contents
  
  def cd(self,directory_name):
    """Change the current TDirectoryFile. The familiar "-" and ".." directories 
    can be accessed as well.
    """
    if directory_name=="-":
      tmp=self.rootfilepwd
      self.rootfilepwd=self.rootfileprevpwd
      self.rootfileprevpwd=tmp
    if directory_name=="..":
      #print "Setting prevpwd"
      self.rootfileprevpwd=self.rootfilepwd
      #print "The mom"
      mom=self.rootfilepwd.GetMotherDir()
      #print "In directory +%s+" %self.rootfilepwd
      #print "Deleting the TFileDir"
      if "Run " not in self.rootfilepwd.GetName():
        self.rootfilepwd.Delete()
      #print "Setting pwd to mom"
      self.rootfilepwd=mom
    else:
      new_directory=self.rootfilepwd.GetDirectory(directory_name)
      if not self.__is_null(new_directory,directory_name):
          self.rootfileprevpwd=self.rootfilepwd
          self.rootfilepwd=new_directory
    
  def getObj(self,objname):
    """Get a TObject from the rootfile.
    """
    obj=self.rootfilepwd.Get(objname)
    if not self.__is_null(obj,objname):
      return obj

#-------------------------------------------------------------------------------

class DirWalkerFile(object):
  def __init__(self, name, topdirname,rootfilename1, rootfilename2, run=-1, black_list=[], stat_test="KS", test_threshold=.5,draw_success=True,do_pngs=False, black_list_histos=[]):
    self.name=name
    self.dqmrootfile1=DQMRootFile(abspath(rootfilename1))
    self.dqmrootfile2=DQMRootFile(abspath(rootfilename2))
    self.run=run
    self.stat_test=Statistical_Tests[stat_test](test_threshold)
    self.workdir=getcwd()
    self.black_list=black_list
    self.directory=Directory(topdirname)
    #print "DIRWALKERFILE %s %s" %(draw_success,do_pngs)
    self.directory.draw_success=draw_success
    self.directory.do_pngs=do_pngs
    self.black_list_histos = black_list_histos
    self.different_histograms = {}
    self.filename1 = basename(rootfilename2)
    self.filename2 = basename(rootfilename1)

  def __del__(self):
    chdir(self.workdir)
     
  def cd(self,directory_name, on_disk=False, regexp=False,):
    if regexp == True:
        if len(directory_name)!=0:
            if on_disk:
                if not exists(directory_name):
                    makedirs(directory_name)
                    chdir(directory_name)  
            tmp = self.dqmrootfile2.ls().keys()
            for elem in tmp:
                if "Run" in elem:
                    next_dir = elem
            self.dqmrootfile2.cd(next_dir)
            tmp = self.dqmrootfile1.ls().keys()
            for elem in tmp:
                if "Run" in elem:
                    next_dir = elem
            self.dqmrootfile1.cd(next_dir)
    else:
        if len(directory_name)!=0:
            if on_disk:
                if not exists(directory_name):
                    makedirs(directory_name)
                    chdir(directory_name)
            self.dqmrootfile2.cd(directory_name)
            self.dqmrootfile1.cd(directory_name)
    
  def ls(self,directory_name=""):
    """Return common objects to the 2 files.
    """
    contents1=self.dqmrootfile1.ls(directory_name)
    contents2=self.dqmrootfile2.ls(directory_name)
    #print "cont1: %s"%(contents1)
    #print "cont2: %s"%(contents2)
    contents={}
    self.different_histograms['file1']= {}
    self.different_histograms['file2']= {}
    keys = filter(lambda key: contents1.has_key(key),contents2.keys()) #set of all possible contents from both files
    #print " ## keys: %s" %(keys)
    for key in keys:  #iterate on all unique keys
      if contents1[key]!=contents2[key]:
        diff_file1 = set(contents1.keys()) - set(contents2.keys()) #set of contents that file1 is missing
        diff_file2 = set(contents2.keys()) - set(contents1.keys()) #--'-- that file2 is missing
        for key1 in diff_file1:
            obj_type = contents1[key1]
            if obj_type == "TDirectoryFile":
              self.different_histograms['file1'][key1] = contents1[key1] #if direcory
              #print "\n Missing inside a dir: ", self.ls(key1)
              #contents[key] = contents1[key1]
            if obj_type[:2]!="TH" and obj_type[:3]!="TPr" : #if histogram
              continue
            self.different_histograms['file1'][key1] = contents1[key1]
        for key1 in diff_file2:
            obj_type = contents2[key1]
            if obj_type == "TDirectoryFile":
              self.different_histograms['file2'][key1] = contents2[key1] #if direcory
              #print "\n Missing inside a dir: ", self.ls(key1)
              #contents[key] = contents2[key1]
            if obj_type[:2]!="TH" and obj_type[:3]!="TPr" : #if histogram
              continue
            self.different_histograms['file2'][key1] = contents2[key1]
      contents[key]=contents1[key]
    return contents
  
  def getObjs(self,name):
    h1=self.dqmrootfile1.getObj(name)
    h2=self.dqmrootfile2.getObj(name)
    return h1,h2
  
  def __fill_single_dir(self,dir_name,directory,mother_name="",depth=0):
    #print "MOTHER NAME  = +%s+" %mother_name
   #print "About to study %s (in dir %s)" %(dir_name,getcwd())
        
    # see if in black_list
    this_dir=DirID(dir_name,depth)
    #print "  ## this_dir: %s"%(this_dir)
    if this_dir in self.black_list: 
      #print "Directory %s skipped because black-listed" %dir_name
      return 0        
        
    depth+=1
    
    self.cd(dir_name)
    #if dir_name == 'HLTJETMET':
    #    print self.ls()
    
    #print "Test %s with thre %s" %(self.stat_test.name, self.stat_test.threshold)
    
    contents=self.ls()
    if depth==1:
      n_top_contents=len(contents)
    
    #print contents
    cont_counter=1
    comparisons=[]
    for name,obj_type in contents.items():
      if obj_type=="TDirectoryFile":        
        #We have a dir, launch recursion!
        #Some feedback on the progress
        if depth==1:
          print "Studying directory %s, %s/%s" %(name,cont_counter,n_top_contents)
          cont_counter+=1          
 
        #print "Studying directory",name
        # ok recursion on!
        subdir=Directory(name)
        subdir.draw_success=directory.draw_success
        subdir.do_pngs=directory.do_pngs
        self.__fill_single_dir(name,subdir,join(mother_name,dir_name),depth)
        if not subdir.is_empty():
          if depth==1:
            print " ->Appending %s..." %name,
          directory.subdirs.append(subdir)
          if depth==1:
            print "Appended."
      else:
        # We have probably an histo. Let's make the plot and the png.        
        if obj_type[:2]!="TH" and obj_type[:3]!="TPr" :
          continue
        h1,h2=self.getObjs(name)
        #print "COMPARISON : +%s+%s+" %(mother_name,dir_name)
        path = join(mother_name,dir_name,name)
        if path in self.black_list_histos:
          print "  Skipping %s" %(path)
          directory.comparisons.append(Comparison(name,
                              join(mother_name,dir_name),
                              h1,h2,
                              deepcopy(self.stat_test),
                              draw_success=directory.draw_success,
                              do_pngs=directory.do_pngs, skip=True))
        else:
          directory.comparisons.append(Comparison(name,
                                join(mother_name,dir_name),
                                h1,h2,
                                deepcopy(self.stat_test),
                                draw_success=directory.draw_success,
                                do_pngs=directory.do_pngs, skip=False))
          directory.filename1 = self.filename1
          directory.filename2 = self.filename2
          directory.different_histograms['file1'] = self.different_histograms['file1']
          directory.different_histograms['file2'] = self.different_histograms['file2']

    self.cd("..")
   
  def walk(self):
    # Build the top dir in the rootfile first
    rundir=""
    if self.run<0:
      # change dir in the first one...
      #print  self.ls().keys()
      first_run_dir = ""
      try:
        first_run_dir = filter(lambda k: "Run " in k, self.ls().keys())[0]
      except:
         print "\nRundir not there: Is this a generic rootfile?\n"
      rundir=first_run_dir
      try:
    self.run= int(rundir.split(" ")[1])
      except:
        print "Setting run number to 0"
        self.run= 0
    else:
      rundir="Run %s"%self.run
    
    try:
      self.cd(rundir, False, True) #True -> for checking the Rundir in case of different runs
    except:
      print "\nRundir not there: Is this a generic rootfile?\n"
    
    # Let's rock!
    self.__fill_single_dir(self.directory.name,self.directory)
    print "Finished"
    n_left_threads=len(tcanvas_print_processes)
    if n_left_threads>0:
      print "Waiting for %s threads to finish..." %n_left_threads
      for p in tcanvas_print_processes:
        p.join()  

#-------------------------------------------------------------------------------

class DirWalkerFile_thread_wrapper(Thread):
  def __init__(self, walker):
    Thread.__init__(self)
    self.walker=walker
  def run(self):
    self.walker.walk()
    
#-------------------------------------------------------------------------------

def string2blacklist(black_list_str):
  black_list=[]
  # replace the + with " ":
  black_list_str=black_list_str.replace("__"," ")
  if len(black_list_str)>0:
    for ele in black_list_str.split(","):
      dirname,level=ele.split("@")
      level=int(level)
      dirid=None
      if "/" not in dirname:
        dirid=DirID(dirname,level)
      else:
        mother,daughter=dirname.split("/")
        dirid=DirID(daughter,level,mother)
      if not dirid in black_list:
        black_list.append(dirid)
        
  return black_list
    
#-------------------------------------------------------------------------------