def get_ogle_parameters(config, log):
'''Function to download the parameters of lensing events from the OGLE survey.
OGLE make these available via anonymous FTP from ftp.astrouw.edu.pl in the form of two files.
ogle/ogle4/ews/last.changed contains a yyyymmdd.daydecimal timestamp of the time of last update
ogle/ogle4/ews/<year>/lenses.par contains a list of all known lenses with the following columns:
Event Field StarNo RA(J2000) Dec(J2000) Tmax(HJD) Tmax(UT) tau umin Amax Dmag fbl I_bl I0
This function returns the parameters of all the lenses as a dictionary, plus a datetime object of the last changed date.
'''
log.info('Syncing data from OGLE')
ogle_data = survey_classes.SurveyData()
years = [ '2014', '2015', '2016' ]
# Fetch the parameter files from OGLE via anonymous FTP
ftp = ftplib.FTP( config['ogle_ftp_server'] )
ftp.login()
ftp_file_path = path.join( 'ogle', 'ogle4', 'ews' )
ts_file_path = path.join( config['ogle_data_local_location'],
config['ogle_time_stamp_file'] )
ftp.cwd(ftp_file_path)
ftp.retrbinary('RETR last.changed', open( ts_file_path, 'w').write )
ts = Time.now()
for year in years:
ftp_file_path = path.join( str(year) )
ftp.cwd(ftp_file_path)
par_file_path = path.join( config['ogle_data_local_location'], \
config['ogle_lenses_file']+'.'+str(year) )
ftp.retrbinary('RETR lenses.par', open( par_file_path, 'w').write )
ftp.cwd('../')
ftp.quit()
ogle_data = survey_data_utilities.read_ogle_param_files( config )
log.info('--> Last updated at: ' + \
ogle_data.last_changed.strftime("%Y-%m-%dT%H:%M:%S"))
log.info('--> Downloaded index of ' + str(len(ogle_data.lenses)) + \
' events')
update_file_path = path.join( config['ogle_data_local_location'], \
config['ogle_updated_file'] )
ogle_data.last_updated = \
survey_data_utilities.write_update_file( update_file_path )
log.info('-> Completed sync of data from OGLE')
return ogle_data
