o !d@s2ddlZddlmZeeZGdddeZdS)N)advance_iteratorc@s(eZdZdZddZddZddZdS) ComparatorzN This class performs all of the comparisons behind the sync operation cCs||_||_||_dS)N)_sync_strategy_not_at_dest_sync_strategy_not_at_src_sync_strategy)selfZ"file_at_src_and_dest_sync_strategyZfile_not_at_dest_sync_strategyZfile_not_at_src_sync_strategyrGusr/lib/python3.10/site-packages/awscli/customizations/s3/comparator.py__init__s zComparator.__init__c csXd}d}d}d} z |s|rt|}Wn ty!d}d}Ynwz |s+|r+t|}Wn ty9d}d}Ynw|s|sd}d}|||} | dkrY|j||} | rX|VnR| dkrnd}d}|j|d} | rm|Vn=| dkrd}d}|jd|} | r|Vn(|s|rd}|j|d} | r|Vn|r|sd}|jd|} | r|VndSq )a This function preforms the actual comparisons. The parameters it takes are the generated files for both the source and the destination. The key concept in this function is that no matter the type of where the files are coming from, they are listed in the same order, least to greatest in collation order. This allows for easy comparisons to determine if file needs to be added or deleted. Comparison keys are used to determine if two files are the same and each file has a unique comparison key. If they are the same compare the size and last modified times to see if a file needs to be updated. Ultimately, it will yield a sequence of file info objectsthat will be sent to the ``S3Handler``. :param src_files: The generated FileInfo objects from the source. :param dest_files: The generated FileInfo objects from the dest. :returns: Yields the FilInfo objects of the files that need to be operated on Algorithm: Try to take next from both files. If it is empty signal corresponding done flag. If both generated lists are not done compare compare_keys. If equal, compare size and time to see if it needs to be updated. If source compare_key is less than dest compare_key, the file needs to be added to the destination. Take the next source file but not not destination file. If the source compare_key is greater than dest compare_key, that destination file needs to be deleted from the destination. Take the next dest file but not the source file. If the source list is empty delete the rest of the files in the dest list from the destination. If the dest list is empty add the rest of the file in source list to the destination. FTNequal less_than greater_than)r StopIterationcompare_comp_keyrZdetermine_should_syncrr) rZ src_filesZ dest_filesZsrc_doneZ dest_doneZsrc_takeZ dest_takesrc_file dest_fileZ compare_keysZ should_syncrrr call sz#   zComparator.callcCs(|j}|j}||kr dS||krdSdS)z Determines if the source compare_key is less than, equal to, or greater than the destination compare_key r r r )Z compare_key)rrrZ src_comp_keyZ dest_comp_keyrrr rszComparator.compare_comp_keyN)__name__ __module__ __qualname____doc__r rrrrrr rs  br)loggingZ awscli.compatr getLoggerrZLOGobjectrrrrr s