Update checked in version of gsutil to version 4.6

gslib/cloud_api.py

+# -*- coding: utf-8 -*-
+# Copyright 2013 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.
+"""Gsutil API for interacting with cloud storage providers."""
+
+from __future__ import absolute_import
+
+
+class CloudApi(object):
+  """Abstract base class for interacting with cloud storage providers.
+
+  Implementations of the gsutil Cloud API are not guaranteed to be thread-safe.
+  Behavior when calling a gsutil Cloud API instance simultaneously across
+  threads is undefined and doing so will likely cause errors. Therefore,
+  a separate instance of the gsutil Cloud API should be instantiated per-thread.
+  """
+
+  def __init__(self, bucket_storage_uri_class, logger, provider=None, debug=0):
+    """Performs necessary setup for interacting with the cloud storage provider.
+
+    Args:
+      bucket_storage_uri_class: boto storage_uri class, used by APIs that
+                                provide boto translation or mocking.
+      logger: logging.logger for outputting log messages.
+      provider: Default provider prefix describing cloud storage provider to
+                connect to.
+      debug: Debug level for the API implementation (0..3).
+    """
+    self.bucket_storage_uri_class = bucket_storage_uri_class
+    self.logger = logger
+    self.provider = provider
+    self.debug = debug
+
+  def GetBucket(self, bucket_name, provider=None, fields=None):
+    """Gets Bucket metadata.
+
+    Args:
+      bucket_name: Name of the bucket.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Bucket metadata fields, for
+              example, ['logging', 'defaultObjectAcl']
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Bucket object.
+    """
+    raise NotImplementedError('GetBucket must be overloaded')
+
+  def ListBuckets(self, project_id=None, provider=None, fields=None):
+    """Lists bucket metadata for the given project.
+
+    Args:
+      project_id: Project owning the buckets, default from config if None.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these metadata fields for the listing,
+              for example:
+              ['items/logging', 'items/defaultObjectAcl'].
+              Note that the WildcardIterator class should be used to list
+              buckets instead of calling this function directly.  It amends
+              the fields definition from get-like syntax such as
+              ['logging', 'defaultObjectAcl'] so that the caller does not
+              need to prepend 'items/' or specify fields necessary for listing
+              (like nextPageToken).
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Iterator over Bucket objects.
+    """
+    raise NotImplementedError('ListBuckets must be overloaded')
+
+  def PatchBucket(self, bucket_name, metadata, preconditions=None,
+                  provider=None, fields=None):
+    """Updates bucket metadata for the bucket with patch semantics.
+
+    Args:
+      bucket_name: Name of bucket to update.
+      metadata: Bucket object defining metadata to be updated.
+      preconditions: Preconditions for the request.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Bucket metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Bucket object describing new bucket metadata.
+    """
+    raise NotImplementedError('PatchBucket must be overloaded')
+
+  def CreateBucket(self, bucket_name, project_id=None, metadata=None,
+                   provider=None, fields=None):
+    """Creates a new bucket with the specified metadata.
+
+    Args:
+      bucket_name: Name of the new bucket.
+      project_id: Project owner of the new bucket, default from config if None.
+      metadata: Bucket object defining new bucket metadata.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Bucket metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Bucket object describing new bucket metadata.
+    """
+    raise NotImplementedError('CreateBucket must be overloaded')
+
+  def DeleteBucket(self, bucket_name, preconditions=None, provider=None):
+    """Deletes a bucket.
+
+    Args:
+      bucket_name: Name of the bucket to delete.
+      preconditions: Preconditions for the request.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      None.
+    """
+    raise NotImplementedError('DeleteBucket must be overloaded')
+
+  class CsObjectOrPrefixType(object):
+    """Enum class for describing CsObjectOrPrefix types."""
+    OBJECT = 'object'  # Cloud object
+    PREFIX = 'prefix'  # Cloud bucket subdirectory
+
+  class CsObjectOrPrefix(object):
+    """Container class for ListObjects results."""
+
+    def __init__(self, data, datatype):
+      """Stores a ListObjects result.
+
+      Args:
+        data: Root object, either an apitools Object or a string Prefix.
+        datatype: CsObjectOrPrefixType of data.
+      """
+      self.data = data
+      self.datatype = datatype
+
+  def ListObjects(self, bucket_name, prefix=None, delimiter=None,
+                  all_versions=None, provider=None, fields=None):
+    """Lists objects (with metadata) and prefixes in a bucket.
+
+    Args:
+      bucket_name: Bucket containing the objects.
+      prefix: Prefix for directory-like behavior.
+      delimiter: Delimiter for directory-like behavior.
+      all_versions: If true, list all object versions.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these metadata fields for the listing,
+              for example:
+              ['items/acl', 'items/updated', 'prefixes'].
+              Note that the WildcardIterator class should be used to list
+              objects instead of calling this function directly.  It amends
+              the fields definition from get-like syntax such as
+              ['acl', 'updated'] so that the caller does not need to
+              prepend 'items/' or specify any fields necessary for listing
+              (such as prefixes or nextPageToken).
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Iterator over CsObjectOrPrefix wrapper class.
+    """
+    raise NotImplementedError('ListObjects must be overloaded')
+
+  def GetObjectMetadata(self, bucket_name, object_name, generation=None,
+                        provider=None, fields=None):
+    """Gets object metadata.
+
+    Args:
+      bucket_name: Bucket containing the object.
+      object_name: Object name.
+      generation: Generation of the object to retrieve.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields, for
+              example, ['acl', 'updated'].
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Object object.
+    """
+    raise NotImplementedError('GetObjectMetadata must be overloaded')
+
+  def PatchObjectMetadata(self, bucket_name, object_name, metadata,
+                          generation=None, preconditions=None, provider=None,
+                          fields=None):
+    """Updates object metadata with patch semantics.
+
+    Args:
+      bucket_name: Bucket containing the object.
+      object_name: Object name for object.
+      metadata: Object object defining metadata to be updated.
+      generation: Generation (or version) of the object to update.
+      preconditions: Preconditions for the request.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Updated object metadata.
+    """
+    raise NotImplementedError('PatchObjectMetadata must be overloaded')
+
+  class DownloadStrategy(object):
+    """Enum class for specifying download strategy."""
+    ONE_SHOT = 'oneshot'
+    RESUMABLE = 'resumable'
+
+  def GetObjectMedia(self, bucket_name, object_name, download_stream,
+                     provider=None, generation=None, object_size=None,
+                     download_strategy=DownloadStrategy.ONE_SHOT, start_byte=0,
+                     end_byte=None, progress_callback=None,
+                     serialization_data=None, digesters=None):
+    """Gets object data.
+
+    Args:
+      bucket_name: Bucket containing the object.
+      object_name: Object name.
+      download_stream: Stream to send the object data to.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      generation: Generation of the object to retrieve.
+      object_size: Total size of the object being downloaded.
+      download_strategy: Cloud API download strategy to use for download.
+      start_byte: Starting point for download (for resumable downloads and
+                  range requests). Can be set to negative to request a range
+                  of bytes (python equivalent of [:-3])
+      end_byte: Ending point for download (for range requests).
+      progress_callback: Optional callback function for progress notifications.
+                         Receives calls with arguments
+                         (bytes_transferred, total_size).
+      serialization_data: Implementation-specific dict containing serialization
+                          information for the download.
+      digesters: Dict of {string : digester}, where string is a name of a hash
+                 algorithm, and digester is a validation digester that supports
+                 update(bytes) and digest() using that algorithm.
+                 Implementation can set the digester value to None to indicate
+                 bytes were not successfully digested on-the-fly.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Content-encoding string if it was detected that the server sent an encoded
+      object during transfer, None otherwise.
+    """
+    raise NotImplementedError('GetObjectMedia must be overloaded')
+
+  def UploadObject(self, upload_stream, object_metadata, canned_acl=None,
+                   size=None, preconditions=None, progress_callback=None,
+                   provider=None, fields=None):
+    """Uploads object data and metadata.
+
+    Args:
+      upload_stream: Seekable stream of object data.
+      object_metadata: Object metadata for new object.  Must include bucket
+                       and object name.
+      canned_acl: Optional canned ACL to apply to object. Overrides ACL set
+                  in object_metadata.
+      size: Optional object size.
+      preconditions: Preconditions for the request.
+      progress_callback: Optional callback function for progress notifications.
+                         Receives calls with arguments
+                         (bytes_transferred, total_size).
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Object object for newly created destination object.
+    """
+    raise NotImplementedError('UploadObject must be overloaded')
+
+  def UploadObjectStreaming(self, upload_stream, object_metadata,
+                            canned_acl=None, preconditions=None,
+                            progress_callback=None, provider=None,
+                            fields=None):
+    """Uploads object data and metadata.
+
+    Args:
+      upload_stream: Stream of object data. May not be seekable.
+      object_metadata: Object metadata for new object.  Must include bucket
+                       and object name.
+      canned_acl: Optional canned ACL to apply to object. Overrides ACL set
+                  in object_metadata.
+      preconditions: Preconditions for the request.
+      progress_callback: Optional callback function for progress notifications.
+                         Receives calls with arguments
+                         (bytes_transferred, total_size), but fills in only
+                         bytes_transferred.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Object object for newly created destination object.
+    """
+    raise NotImplementedError('UploadObject must be overloaded')
+
+  def UploadObjectResumable(
+      self, upload_stream, object_metadata, canned_acl=None,
+      size=None, preconditions=None, serialization_data=None,
+      tracker_callback=None, progress_callback=None, provider=None,
+      fields=None):
+    """Uploads object data and metadata using a resumable upload strategy.
+
+    Args:
+      upload_stream: Seekable stream of object data.
+      object_metadata: Object metadata for new object.  Must include bucket
+                       and object name.
+      canned_acl: Optional canned ACL to apply to object. Overrides ACL set
+                  in object_metadata.
+      size: Total size of the object.
+      preconditions: Preconditions for the request.
+      serialization_data: Dict of {'url' : UploadURL} allowing for uploads to
+                          be resumed.
+      tracker_callback: Callback function taking a upload URL string.
+                        Guaranteed to be called when the implementation gets an
+                        upload URL, allowing the caller to resume the upload
+                        across process breaks by saving the upload URL in
+                        a tracker file.
+      progress_callback: Optional callback function for progress notifications.
+                         Receives calls with arguments
+                         (bytes_transferred, total_size).
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields when the
+              upload is complete.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Object object for newly created destination object.
+    """
+    raise NotImplementedError('UploadObjectResumable must be overloaded')
+
+  def CopyObject(self, src_bucket_name, src_obj_name, dst_obj_metadata,
+                 src_generation=None, canned_acl=None, preconditions=None,
+                 provider=None, fields=None):
+    """Copies an object in the cloud.
+
+    Args:
+      src_bucket_name: Bucket containing the source object
+      src_obj_name: Name of the source object.
+      dst_obj_metadata: Object metadata for new object.  Must include bucket
+                        and object name.
+      src_generation: Generation of the source object to copy.
+      canned_acl: Optional canned ACL to apply to destination object. Overrides
+                  ACL set in dst_obj_metadata.
+      preconditions: Destination object preconditions for the request.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Object object for newly created destination object.
+    """
+    raise NotImplementedError('CopyObject must be overloaded')
+
+  def ComposeObject(self, src_objs_metadata, dst_obj_metadata,
+                    preconditions=None, provider=None, fields=None):
+    """Composes an object in the cloud.
+
+    Args:
+      src_objs_metadata: List of ComposeRequest.SourceObjectsValueListEntries
+                         specifying the objects to compose.
+      dst_obj_metadata: Metadata for the destination object including bucket
+                        and object name.
+      preconditions: Destination object preconditions for the request.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Object metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Composed object metadata.
+    """
+    raise NotImplementedError('ComposeObject must be overloaded')
+
+  def DeleteObject(self, bucket_name, object_name, preconditions=None,
+                   generation=None, provider=None):
+    """Deletes an object.
+
+    Args:
+      bucket_name: Name of the containing bucket.
+      object_name: Name of the object to delete.
+      preconditions: Preconditions for the request.
+      generation: Generation (or version) of the object to delete; if None,
+                  deletes the live object.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      None.
+    """
+    raise NotImplementedError('DeleteObject must be overloaded')
+
+  def WatchBucket(self, bucket_name, address, channel_id, token=None,
+                  provider=None, fields=None):
+    """Creates a notification subscription for changes to objects in a bucket.
+
+    Args:
+      bucket_name: Bucket containing the objects.
+      address: Address to which to send notifications.
+      channel_id: Unique ID string for the channel.
+      token: If present, token string is delivered with each notification.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+      fields: If present, return only these Channel metadata fields.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      Channel object describing the notification subscription.
+    """
+    raise NotImplementedError('WatchBucket must be overloaded')
+
+  def StopChannel(self, channel_id, resource_id, provider=None):
+    """Stops a notification channel.
+
+    Args:
+      channel_id: Unique ID string for the channel.
+      resource_id: Version-agnostic ID string for the channel.
+      provider: Cloud storage provider to connect to.  If not present,
+                class-wide default is used.
+
+    Raises:
+      ArgumentException for errors during input validation.
+      ServiceException for errors interacting with cloud storage providers.
+
+    Returns:
+      None.
+    """
+    raise NotImplementedError('StopChannel must be overloaded')
+
+
+class Preconditions(object):
+  """Preconditions class for specifying preconditions to cloud API requests."""
+
+  def __init__(self, gen_match=None, meta_gen_match=None):
+    """Instantiates a Preconditions object.
+
+    Args:
+      gen_match: Perform request only if generation of target object
+                 matches the given integer. Ignored for bucket requests.
+      meta_gen_match: Perform request only if metageneration of target
+                      object/bucket matches the given integer.
+    """
+    self.gen_match = gen_match
+    self.meta_gen_match = meta_gen_match
+
+
+class ArgumentException(Exception):
+  """Exception raised when arguments to a Cloud API method are invalid.
+
+    This exception is never raised as a result of a failed call to a cloud
+    storage provider.
+  """
+
+  def __init__(self, reason):
+    Exception.__init__(self)
+    self.reason = reason
+
+  def __repr__(self):
+    return str(self)
+
+  def __str__(self):
+    return '%s: %s' % (self.__class__.__name__, self.reason)
+
+
+class ProjectIdException(ArgumentException):
+  """Exception raised when a Project ID argument is required but not present."""
+
+
+class ServiceException(Exception):
+  """Exception raised when a cloud storage provider request fails.
+
+    This exception is raised only as a result of a failed remote call.
+  """
+
+  def __init__(self, reason, status=None, body=None):
+    Exception.__init__(self)
+    self.reason = reason
+    self.status = status
+    self.body = body
+
+  def __repr__(self):
+    return str(self)
+
+  def __str__(self):
+    message = '%s:' % self.__class__.__name__
+    if self.status:
+      message += ' %s' % self.status
+    message += ' %s' % self.reason
+    if self.body:
+      message += '\n%s' % self.body
+    return message
+
+
+class RetryableServiceException(ServiceException):
+  """Exception class for retryable exceptions."""
+
+
+class ResumableDownloadException(RetryableServiceException):
+  """Exception raised for resumable downloads that can be retried later."""
+
+
+class ResumableUploadException(RetryableServiceException):
+  """Exception raised for resumable uploads that can be retried later."""
+
+
+class ResumableUploadAbortException(ServiceException):
+  """Exception raised for resumable uploads that cannot be retried later."""
+
+
+class AuthenticationException(ServiceException):
+  """Exception raised for errors during the authentication process."""
+
+
+class PreconditionException(ServiceException):
+  """Exception raised for precondition failures."""
+
+
+class NotFoundException(ServiceException):
+  """Exception raised when a resource is not found (404)."""
+
+
+class NotEmptyException(ServiceException):
+  """Exception raised when trying to delete a bucket is not empty."""
+
+
+class BadRequestException(ServiceException):
+  """Exception raised for malformed requests.
+
+    Where it is possible to detect invalid arguments prior to sending them
+    to the server, an ArgumentException should be raised instead.
+  """
+
+
+class AccessDeniedException(ServiceException):
+  """Exception raised  when authenticated user has insufficient access rights.
+
+    This is raised when the authentication process succeeded but the
+    authenticated user does not have access rights to the requested resource.
+  """
+
+