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afanfani |
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#!/usr/bin/env python
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import urllib
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from xml.dom.minidom import parse
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from crab_exceptions import *
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class PhEDExDatasvcInfo:
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"""
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provides information from PhEDEx Data Service
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"""
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# PhEDEx Data Service URL
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datasvc_url="https://cmsweb.cern.ch/phedex/test/datasvc/xml/prod"
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def lfn2pfn(self,node,lfn,protocol):
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"""
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PhEDEx Data Service lfn2pfn call
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input: LFN,node name,protocol
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returns: DOM object with the content of the PhEDEx Data Service call
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"""
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params = {'node' : node , 'lfn': lfn , 'protocol': protocol}
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params = urllib.urlencode(params)
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#print params
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datasvc_lfn2pfn="%s/lfn2pfn"%self.datasvc_url
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urlresults = urllib.urlopen(datasvc_lfn2pfn, params)
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try:
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urlresults = parse(urlresults)
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except:
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urlresults = None
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return urlresults
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def parse_error(self,urlresults):
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"""
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look for errors in the DOM object returned by PhEDEx Data Service call
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"""
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errormsg = None
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errors=urlresults.getElementsByTagName('error')
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for error in errors:
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errormsg=error.childNodes[0].data
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if len(error.childNodes)>1:
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errormsg+=error.childNodes[1].data
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return errormsg
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def parse_lfn2pfn(self,urlresults):
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"""
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Parse the content of the result of lfn2pfn PhEDEx Data Service call
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input: DOM object with the content of the lfn2pfn call
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returns: PFN
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"""
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result = urlresults.getElementsByTagName('phedex')
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if not result:
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return []
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result = result[0]
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pfn = None
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mapping = result.getElementsByTagName('mapping')
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for m in mapping:
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pfn=m.getAttribute("pfn")
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if pfn:
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return pfn
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def getStageoutPFN(self,node,lfn,protocol):
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"""
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input: LFN,node name,protocol
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returns: PFN
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"""
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fullurl="%s/lfn2pfn?node=%s&lfn=%s&protocol=%s"%(self.datasvc_url,node,lfn,protocol)
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domlfn2pfn = self.lfn2pfn(node,lfn,protocol)
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if not domlfn2pfn :
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msg="Unable to get info from %s"%fullurl
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raise CrabException(msg)
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errormsg = self.parse_error(domlfn2pfn)
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if errormsg:
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msg="Error extracting info from %s due to: %s"%(fullurl,errormsg)
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raise CrabException(msg)
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stageoutpfn = self.parse_lfn2pfn(domlfn2pfn)
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if not stageoutpfn:
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msg="Unable to get stageout path (PFN) from %s"%fullurl
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raise CrabException(msg)
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return stageoutpfn
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if __name__ == '__main__' :
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"""
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"""
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from crab_logger import Logger
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from WorkSpace import *
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continue_dir="/home/fanfani/CRAB"
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cfg_params={'USER.logdir' : continue_dir }
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common.work_space = WorkSpace(continue_dir, cfg_params)
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log = Logger()
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common.logger = log
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from LFNBaseName import *
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# test values
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lfn = LFNBase("datasetstring")
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node='T2_IT_Bari'
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protocol="srmv2"
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#create an instance of the PhEDExDatasvcInfo object
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dsvc = PhEDExDatasvcInfo()
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#extract the PFN for the given node,LFN,protocol
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print "Stageout to %s"%dsvc.getStageoutPFN(node,lfn,protocol)
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