<s> from collections import defaultdict <EOL> import os <EOL> from datetime import timedelta , datetime <EOL> import requests <EOL> class CacheTierClient : <EOL> """<STR_LIT>""" <EOL> __remote_status_cache = defaultdict ( ) <EOL> def __init__ ( self , base_url , <EOL> request_timeout = <NUM_LIT:1.0> , <EOL> enable_local_cache = True , <EOL> local_cache_time = <NUM_LIT> , <EOL> log_enabled = False ) : <EOL> """<STR_LIT>""" <EOL> self . local_cache_time = local_cache_time <EOL> """<STR_LIT>""" <EOL> self . enabled = enable_local_cache <EOL> """<STR_LIT>""" <EOL> self . request_timeout = request_timeout <EOL> """<STR_LIT>""" <EOL> self . base_url = base_url . strip ( ) . strip ( '<STR_LIT:/>' ) + '<STR_LIT:/>' <EOL> """<STR_LIT>""" <EOL> self . log_enabled = log_enabled <EOL> """<STR_LIT>""" <EOL> def verify_file ( self , file_name ) : <EOL> """<STR_LIT>""" <EOL> self . __validate_file_name ( file_name ) <EOL> file_name = os . path . basename ( file_name . strip ( ) ) <EOL> if not self . enabled : <EOL> self . __log ( "<STR_LIT>" ) <EOL> return self . __get_server_status ( file_name ) <EOL> if self . is_stale ( file_name ) : <EOL> self . __log ( "<STR_LIT>" . format ( file_name ) ) <EOL> available = self . refresh_status_from_server ( file_name ) <EOL> return available <EOL> time , status = CacheTierClient . __remote_status_cache . get ( <EOL> file_name . lower ( ) , ( None , False ) ) <EOL> self . __log ( "<STR_LIT>" . format ( file_name , status ) ) <EOL> return status <EOL> def refresh_status_from_server ( self , file_name ) : <EOL> available = self . __get_server_status ( file_name ) <EOL> self . __update_verify_time ( file_name , available ) <EOL> self . __log ( "<STR_LIT>" . format ( file_name , available ) ) <EOL> return available <EOL> @ staticmethod <EOL> def __update_verify_time ( file_name , available ) : <EOL> name = file_name . lower ( ) <EOL> CacheTierClient . __remote_status_cache [ name ] = ( datetime . now ( ) , available ) <EOL> def is_stale ( self , file_name ) : <EOL> """<STR_LIT>""" <EOL> self . __validate_file_name ( file_name ) <EOL> file_name = os . path . basename ( file_name . strip ( ) ) <EOL> if not self . enabled : <EOL> return True <EOL> item = CacheTierClient . __remote_status_cache . get ( <EOL> file_name . lower ( ) , ( None , False ) ) <EOL> last_request , available = item <EOL> if last_request is None : <EOL> return True <EOL> dt = timedelta ( seconds = self . local_cache_time ) <EOL> valid_range = last_request + dt <EOL> return valid_range < datetime . now ( ) <EOL> def __build_verify_url ( self , file_name ) : <EOL> self . __validate_file_name ( file_name ) <EOL> file_name = os . path . basename ( file_name . strip ( ) ) <EOL> return self . base_url + "<STR_LIT>" + file_name <EOL> def build_download_url ( self , file_name ) : <EOL> """<STR_LIT>""" <EOL> self . __validate_file_name ( file_name ) <EOL> return self . base_url + "<STR_LIT>" + file_name <EOL> def __validate_file_name ( self , file_name ) : <EOL> if not file_name or not file_name . strip ( ) : <EOL> raise CacheException ( "<STR_LIT>" . format ( file_name ) ) <EOL> def __get_server_status ( self , file_name ) : <EOL> try : <EOL> url = self . __build_verify_url ( file_name ) <EOL> r = requests . get ( url , timeout = self . request_timeout ) <EOL> result = r . json ( ) <EOL> if result [ "<STR_LIT:error>" ] : <EOL> self . __log ( "<STR_LIT>" + result [ "<STR_LIT>" ] ) <EOL> return result [ '<STR_LIT>' ] <EOL> except Exception as x : <EOL> self . __log ( "<STR_LIT>" . format ( x ) ) <EOL> return False <EOL> def __log ( self , msg ) : <EOL> if not self . log_enabled or not msg or not msg . strip ( ) : <EOL> return <EOL> print ( '<STR_LIT>' . format ( msg . strip ( ) ) ) <EOL> class CacheException ( Exception ) : <EOL> """<STR_LIT>""" <EOL> pass </s>
