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# -*- coding: utf-8 -*- # Copyright 2015 Google Inc. All Rights Reserved. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. """Helper functions for composite upload tracker file functionality.""" from __future__ import absolute_import from __future__ import print_function from __future__ import division from __future__ import unicode_literals from collections import namedtuple import errno import json import random import six import gslib from gslib.exception import CommandException from gslib.tracker_file import (WriteJsonDataToTrackerFile, RaiseUnwritableTrackerFileException) from gslib.utils.constants import UTF8 ObjectFromTracker = namedtuple('ObjectFromTracker', 'object_name generation') class _CompositeUploadTrackerEntry(object): """Enum class for composite upload tracker file JSON keys.""" COMPONENTS_LIST = 'components' COMPONENT_NAME = 'component_name' COMPONENT_GENERATION = 'component_generation' ENC_SHA256 = 'encryption_key_sha256' PREFIX = 'prefix' def ReadParallelUploadTrackerFile(tracker_file_name, logger): """Read the tracker file from the last parallel composite upload attempt. If it exists, the tracker file is of the format described in WriteParallelUploadTrackerFile or a legacy format. If the file doesn't exist or is formatted incorrectly, then the upload will start from the beginning. This function is not thread-safe and must be protected by a lock if called within Command.Apply. Args: tracker_file_name: The name of the tracker file to read parse. logger: logging.Logger for outputting log messages. Returns: enc_key_sha256: Encryption key SHA256 used to encrypt the existing components, or None if an encryption key was not used. component_prefix: String prefix used in naming the existing components, or None if no prefix was found. existing_components: A list of ObjectFromTracker objects representing the set of files that have already been uploaded. """ enc_key_sha256 = None prefix = None existing_components = [] tracker_file = None # If we already have a matching tracker file, get the serialization data # so that we can resume the upload. try: tracker_file = open(tracker_file_name, 'r') tracker_data = tracker_file.read() tracker_json = json.loads(tracker_data) enc_key_sha256 = tracker_json[_CompositeUploadTrackerEntry.ENC_SHA256] prefix = tracker_json[_CompositeUploadTrackerEntry.PREFIX] for component in tracker_json[_CompositeUploadTrackerEntry.COMPONENTS_LIST]: existing_components.append( ObjectFromTracker( component[_CompositeUploadTrackerEntry.COMPONENT_NAME], component[_CompositeUploadTrackerEntry.COMPONENT_GENERATION])) except IOError as e: # Ignore non-existent file (happens first time a upload is attempted on an # object, or when re-starting an upload after a # ResumableUploadStartOverException), but warn user for other errors. if e.errno != errno.ENOENT: logger.warn( 'Couldn\'t read upload tracker file (%s): %s. Restarting ' 'parallel composite upload from scratch.', tracker_file_name, e.strerror) except (KeyError, ValueError) as e: # Legacy format did not support user-supplied encryption. enc_key_sha256 = None (prefix, existing_components) = _ParseLegacyTrackerData(tracker_data) finally: if tracker_file: tracker_file.close() return (enc_key_sha256, prefix, existing_components) def _ParseLegacyTrackerData(tracker_data): """Parses a legacy parallel composite upload tracker file. Args: tracker_data: Legacy tracker file contents. Returns: component_prefix: The prefix used in naming the existing components, or None if no prefix was found. existing_components: A list of ObjectFromTracker objects representing the set of files that have already been uploaded. """ # Old tracker files used a non-JSON format. # The first line represents the prefix, followed by line pairs of object_name # and generation. Discard the last blank line. old_tracker_data = tracker_data.split('\n')[:-1] prefix = None existing_components = [] if old_tracker_data: prefix = old_tracker_data[0] i = 1 while i < len(old_tracker_data) - 1: (name, generation) = (old_tracker_data[i], old_tracker_data[i + 1]) if not generation: # Cover the '' case. generation = None existing_components.append(ObjectFromTracker(name, generation)) i += 2 return (prefix, existing_components) def ValidateParallelCompositeTrackerData(tracker_file_name, existing_enc_sha256, existing_prefix, existing_components, current_enc_key_sha256, bucket_url, command_obj, logger, delete_func, delete_exc_handler): """Validates that tracker data matches the current encryption key. If the data does not match, makes a best-effort attempt to delete existing temporary component objects encrypted with the old key. Args: tracker_file_name: String file name of tracker file. existing_enc_sha256: Encryption key SHA256 used to encrypt the existing components, or None if an encryption key was not used. existing_prefix: String prefix used in naming the existing components, or None if no prefix was found. existing_components: A list of ObjectFromTracker objects representing the set of files that have already been uploaded. current_enc_key_sha256: Current Encryption key SHA256 that should be used to encrypt objects. bucket_url: Bucket URL in which the components exist. command_obj: Command class for calls to Apply. logger: logging.Logger for outputting log messages. delete_func: command.Apply-callable function for deleting objects. delete_exc_handler: Exception handler for delete_func. Returns: prefix: existing_prefix, or None if the encryption key did not match. existing_components: existing_components, or empty list if the encryption key did not match. """ if six.PY3: if isinstance(existing_enc_sha256, str): existing_enc_sha256 = existing_enc_sha256.encode(UTF8) if isinstance(current_enc_key_sha256, str): current_enc_key_sha256 = current_enc_key_sha256.encode(UTF8) if existing_prefix and existing_enc_sha256 != current_enc_key_sha256: try: logger.warn( 'Upload tracker file (%s) does not match current encryption ' 'key. Deleting old components and restarting upload from ' 'scratch with a new tracker file that uses the current ' 'encryption key.', tracker_file_name) components_to_delete = [] for component in existing_components: url = bucket_url.Clone() url.object_name = component.object_name url.generation = component.generation command_obj.Apply( delete_func, components_to_delete, delete_exc_handler, arg_checker=gslib.command.DummyArgChecker, parallel_operations_override=command_obj.ParallelOverrideReason.SPEED) except: # pylint: disable=bare-except # Regardless of why we can't clean up old components, need to proceed # with the user's original intent to upload the file, so merely warn. component_names = [ component.object_name for component in existing_components ] logger.warn( 'Failed to delete some of the following temporary objects:\n%s\n' '(Continuing on to re-upload components from scratch.)', '\n'.join(component_names)) # Encryption keys have changed, so the old components and prefix # cannot be used. return (None, []) return (existing_prefix, existing_components) def GenerateComponentObjectPrefix(encryption_key_sha256=None): """Generates a random prefix for component objects. Args: encryption_key_sha256: Encryption key SHA256 that will be used to encrypt the components. This is hashed into the prefix to avoid collision during resumption with a different encryption key. Returns: String prefix for use in the composite upload. """ return str( (random.randint(1, (10**10) - 1) + hash(encryption_key_sha256)) % 10**10) def WriteComponentToParallelUploadTrackerFile(tracker_file_name, tracker_file_lock, component, logger, encryption_key_sha256=None): """Rewrites an existing tracker file with info about the uploaded component. Follows the format described in _CreateParallelUploadTrackerFile. Args: tracker_file_name: Tracker file to append to. tracker_file_lock: Thread and process-safe Lock protecting the tracker file. component: ObjectFromTracker describing the object that was uploaded. logger: logging.Logger for outputting log messages. encryption_key_sha256: Encryption key SHA256 for use in this upload, if any. """ with tracker_file_lock: (existing_enc_key_sha256, prefix, existing_components) = (ReadParallelUploadTrackerFile( tracker_file_name, logger)) if existing_enc_key_sha256 != encryption_key_sha256: raise CommandException( 'gsutil client error: encryption key SHA256 (%s) in tracker file ' 'does not match encryption key SHA256 (%s) of component %s' % (existing_enc_key_sha256, encryption_key_sha256, component.object_name)) newly_completed_components = [component] completed_components = existing_components + newly_completed_components WriteParallelUploadTrackerFile(tracker_file_name, prefix, completed_components, encryption_key_sha256=encryption_key_sha256) def WriteParallelUploadTrackerFile(tracker_file_name, prefix, components, encryption_key_sha256=None): """Writes information about components that were successfully uploaded. The tracker file is serialized JSON of the form: { "encryption_key_sha256": sha256 hash of encryption key (or null), "prefix": Prefix used for the component objects, "components": [ { "component_name": Component object name, "component_generation": Component object generation (or null), }, ... ] } where N is the number of components that have been successfully uploaded. This function is not thread-safe and must be protected by a lock if called within Command.Apply. Args: tracker_file_name: The name of the parallel upload tracker file. prefix: The generated prefix that used for uploading any existing components. components: A list of ObjectFromTracker objects that were uploaded. encryption_key_sha256: Encryption key SHA256 for use in this upload, if any. """ if six.PY3: if isinstance(encryption_key_sha256, bytes): encryption_key_sha256 = encryption_key_sha256.decode('ascii') tracker_components = [] for component in components: tracker_components.append({ _CompositeUploadTrackerEntry.COMPONENT_NAME: component.object_name, _CompositeUploadTrackerEntry.COMPONENT_GENERATION: component.generation }) tracker_file_data = { _CompositeUploadTrackerEntry.COMPONENTS_LIST: tracker_components, _CompositeUploadTrackerEntry.ENC_SHA256: encryption_key_sha256, _CompositeUploadTrackerEntry.PREFIX: prefix } WriteJsonDataToTrackerFile(tracker_file_name, tracker_file_data)