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#-toDo: move this to common?
import logging
import json
import os
import sys
import time
import subprocess
import pycurl
tier0Url = os.getenv('TIER0_API_URL', 'https://cmsweb.cern.ch/t0wmadatasvc/prod/')
class Tier0Error(Exception):
'''Tier0 exception.
'''
def __init__(self, message):
self.args = (message, )
def unique(seq, keepstr=True):
t = type(seq)
if t is str:
t = (list, t('').join)[bool(keepstr)]
try:
remaining = set(seq)
seen = set()
return t(c for c in seq if (c in remaining and not remaining.remove(c)))
except TypeError: # hashing didn't work, see if seq is sortable
try:
from itertools import groupby
s = sorted(enumerate(seq),key=lambda i_v1:(i_v1[1],i_v1[0]))
return t(next(g) for k,g in groupby(s, lambda i_v: i_v[1]))
except: # not sortable, use brute force
seen = []
return t(c for c in seq if not (c in seen or seen.append(c)))
#note: this exception seems unused
class ResponseError( Tier0Error ):
def __init__( self, curl, response, proxy, timeout, maxTime ):
super( ResponseError, self ).__init__( response )
self.args += ( curl, proxy )
self.timeout = timeout
self.maxTime = maxTime
def __str__(self):
errStr = f'Wrong response for curl connection to Tier0DataSvc'\
f' from URL "{self.args[1].getinfo(self.args[1].EFFECTIVE_URL)}"'
if self.args[-1]:
errStr += f' using proxy "{str(self.args[-1])}"'
errStr += f' with connection-timeout "{self.timeout}", max-time "{self.maxtime}"'\
f' with error code "{self.args[1].getinfo(self.args[1].RESPONSE_CODE)}".'
if '<p>' in self.args[0]:
full_response = self.args[0].partition('<p>')[-1].rpartition('</p>')[0]
errStr += f'\nFull response: "{full_response}".'
else:
errStr += f'\nFull response: "{self.args[0]}".'
return errStr
#TODO: Add exceptions for each category of HTTP error codes
#TODO: check response code and raise corresponding exceptions
#note: this function seems to be unused
def _raise_http_error( curl, response, proxy, timeout, maxTime ):
raise ResponseError( curl, response, proxy, timeout, maxTime )
class Tier0Handler( object ):
def __init__( self, uri, timeOut, maxTime, retries, retryPeriod, proxy, debug ):
"""
Parameters:
uri: Tier0DataSvc URI;
timeOut: time out for connection of Tier0DataSvc HTTPS calls [seconds];
maxTime: maximum time for Tier0DataSvc HTTPS calls (including data transfer) [seconds];
retries: maximum retries for Tier0DataSvc HTTPS calls;
retryPeriod: sleep time between two Tier0DataSvc HTTPS calls [seconds];
proxy: HTTP proxy for accessing Tier0DataSvc HTTPS calls;
debug: if set to True, enables debug information.
"""
self._uri = uri
self._timeOut = timeOut
self._maxTime = maxTime
self._retries = retries
self._retryPeriod = retryPeriod
self._proxy = proxy
self._debug = debug
def setDebug( self ):
self._debug = True
def unsetDebug( self ):
self._debug = False
def setProxy( self, proxy ):
self._proxy = proxy
def _getCerts( self ) -> str:
cert_path = os.getenv('X509_USER_CERT', '')
key_path = os.getenv('X509_USER_KEY', '')
certs = ""
if cert_path:
certs += f' --cert {cert_path}'
else:
logging.warning("No certificate provided for Tier0 access, use X509_USER_CERT and"
" optionally X509_USER_KEY env variables to specify the path to the cert"
" (and the key unless included in the cert file)")
if key_path:
certs += f' --key {key_path}'
return certs
def _curlQueryTier0( self, url:str, force_debug:bool = False, force_cert:bool = False):
userAgent = "User-Agent: ConditionWebServices/1.0 python/%d.%d.%d PycURL/%s" \
% ( sys.version_info[ :3 ] + ( pycurl.version_info()[ 1 ], ) )
debug = "-v" if self._debug or force_debug else "-s -S"
proxy = f"--proxy {self._proxy}" if self._proxy else ""
certs = self._getCerts() if not self._proxy or force_cert else ""
cmd = f'/usr/bin/curl -k -L --user-agent "{userAgent}" {proxy}'\
f' --connect-timeout {self._timeOut} --max-time {self._maxTime} --retry {self._retries}'\
f' {debug} {url} {certs}'
# time the curl to understand if re-tries have been carried out
start = time.time()
process = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdoutdata, stderrdata) = process.communicate()
end = time.time()
return process.returncode, stdoutdata, stderrdata, end-start
def _queryTier0DataSvc( self, url ):
"""
Queries Tier0DataSvc.
url: Tier0DataSvc URL.
@returns: dictionary, from whence the required information must be retrieved according to the API call.
Raises if connection error, bad response, or timeout after retries occur.
"""
retcode, stdoutdata, stderrdata, query_time = self._curlQueryTier0(url)
if retcode != 0 or stderrdata:
# if the first curl has failed, logg its stderror and prepare and independent retry
msg = "looks like curl returned an error: retcode=%s and took %s seconds" % (retcode, query_time,)
msg += ' msg = "'+str(stderrdata)+'"'
logging.error(msg)
if self._proxy:
logging.info("before assumed proxy provides authentication, now trying with both proxy and certificate")
time.sleep(self._retryPeriod)
retcode, stdoutdata, stderrdata, query_time = self._curlQueryTier0(url, force_debug=True, force_cert=True)
if retcode != 0:
msg = "looks like curl returned an error for the second time: retcode=%s" % (retcode,)
msg += ' msg = "'+str(stderrdata)+'"'
logging.error(msg)
raise Tier0Error(msg)
else:
msg = "curl returned ok upon the second try"
logging.info(msg)
resp = json.loads( ''.join(stdoutdata.decode()).replace( "'", '"').replace(' None', ' "None"') )
return resp
def getFirstSafeRun( self ):
"""
Queries Tier0DataSvc to get the first condition safe run.
Parameters:
@returns: integer, the run number.
Raises if connection error, bad response, timeout after retries occur, or if the run number is not available.
"""
firstConditionSafeRunAPI = "firstconditionsaferun"
safeRunDict = self._queryTier0DataSvc( os.path.join( self._uri, firstConditionSafeRunAPI ) )
if safeRunDict is None:
errStr = """First condition safe run is not available in Tier0DataSvc from URL \"%s\"""" \
%( os.path.join( self._uri, firstConditionSafeRunAPI ), )
if self._proxy:
errStr += """ using proxy \"%s\".""" %( str( self._proxy ), )
raise Tier0Error( errStr )
return int(safeRunDict['result'][0])
def getGlobalTag( self, config ):
"""
Queries Tier0DataSvc to get the most recent Global Tag for a given workflow.
Parameters:
config: Tier0DataSvc API call for the workflow to be looked for;
@returns: a string with the Global Tag name.
Raises if connection error, bad response, timeout after retries occur, or if no Global Tags are available.
"""
data = self._queryTier0DataSvc( os.path.join( self._uri, config ) )
gtnames = sorted(unique( [ str( di['global_tag'] ) for di in data['result'] if di['global_tag'] is not None ] ))
try:
recentGT = gtnames[-1]
return recentGT
except IndexError:
errStr = """No Global Tags for \"%s\" are available in Tier0DataSvc from URL \"%s\"""" \
%( config, os.path.join( self._uri, config ) )
if self._proxy:
errStr += """ using proxy \"%s\".""" %( str( self._proxy ), )
raise Tier0Error( errStr )
def test( url ):
t0 = Tier0Handler( url, 1, 5, 1, 10, None, debug=False)
print(' fcsr = %s (%s)' % (t0.getFirstSafeRun(), type(t0.getFirstSafeRun()) ))
print(' reco_config = %s' % t0.getGlobalTag('reco_config'))
print(' express_config = %s' % t0.getGlobalTag('express_config'))
print('\n')
if __name__ == '__main__':
test( tier0Url )
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