Source code for airflow.contrib.hooks.gcs_hook

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import gzip as gz
import os
import shutil
import warnings

from google.cloud import storage

from airflow.contrib.hooks.gcp_api_base_hook import GoogleCloudBaseHook
from airflow.exceptions import AirflowException


[docs]class GoogleCloudStorageHook(GoogleCloudBaseHook): """ Interact with Google Cloud Storage. This hook uses the Google Cloud Platform connection. """
[docs] _conn = None
def __init__(self, google_cloud_storage_conn_id='google_cloud_default', delegate_to=None): super(GoogleCloudStorageHook, self).__init__(google_cloud_storage_conn_id, delegate_to)
[docs] def get_conn(self): """ Returns a Google Cloud Storage service object. """ if not self._conn: self._conn = storage.Client(credentials=self._get_credentials(), project=self.project_id) return self._conn
# pylint:disable=redefined-builtin
[docs] def copy(self, source_bucket, source_object, destination_bucket=None, destination_object=None): """ Copies an object from a bucket to another, with renaming if requested. destination_bucket or destination_object can be omitted, in which case source bucket/object is used, but not both. :param source_bucket: The bucket of the object to copy from. :type source_bucket: str :param source_object: The object to copy. :type source_object: str :param destination_bucket: The destination of the object to copied to. Can be omitted; then the same bucket is used. :type destination_bucket: str :param destination_object: The (renamed) path of the object if given. Can be omitted; then the same name is used. :type destination_object: str """ destination_bucket = destination_bucket or source_bucket destination_object = destination_object or source_object if source_bucket == destination_bucket and \ source_object == destination_object: raise ValueError( 'Either source/destination bucket or source/destination object ' 'must be different, not both the same: bucket=%s, object=%s' % (source_bucket, source_object)) if not source_bucket or not source_object: raise ValueError('source_bucket and source_object cannot be empty.') client = self.get_conn() source_bucket = client.bucket(source_bucket) source_object = source_bucket.blob(source_object) destination_bucket = client.bucket(destination_bucket) destination_object = source_bucket.copy_blob( blob=source_object, destination_bucket=destination_bucket, new_name=destination_object) self.log.info('Object %s in bucket %s copied to object %s in bucket %s', source_object.name, source_bucket.name, destination_object.name, destination_bucket.name)
[docs] def rewrite(self, source_bucket, source_object, destination_bucket, destination_object=None): """ Has the same functionality as copy, except that will work on files over 5 TB, as well as when copying between locations and/or storage classes. destination_object can be omitted, in which case source_object is used. :param source_bucket: The bucket of the object to copy from. :type source_bucket: str :param source_object: The object to copy. :type source_object: str :param destination_bucket: The destination of the object to copied to. :type destination_bucket: str :param destination_object: The (renamed) path of the object if given. Can be omitted; then the same name is used. """ destination_object = destination_object or source_object if (source_bucket == destination_bucket and source_object == destination_object): raise ValueError( 'Either source/destination bucket or source/destination object ' 'must be different, not both the same: bucket=%s, object=%s' % (source_bucket, source_object)) if not source_bucket or not source_object: raise ValueError('source_bucket and source_object cannot be empty.') client = self.get_conn() source_bucket = client.bucket(source_bucket) source_object = source_bucket.blob(blob_name=source_object) destination_bucket = client.bucket(destination_bucket) token, bytes_rewritten, total_bytes = destination_bucket.blob( blob_name=destination_object).rewrite( source=source_object ) self.log.info('Total Bytes: %s | Bytes Written: %s', total_bytes, bytes_rewritten) while token is not None: token, bytes_rewritten, total_bytes = destination_bucket.blob( blob_name=destination_object).rewrite( source=source_object, token=token ) self.log.info('Total Bytes: %s | Bytes Written: %s', total_bytes, bytes_rewritten) self.log.info('Object %s in bucket %s copied to object %s in bucket %s', source_object.name, source_bucket.name, destination_object, destination_bucket.name)
# pylint:disable=redefined-builtin
[docs] def download(self, bucket, object, filename=None): """ Downloads a file from Google Cloud Storage. When no filename is supplied, the operator loads the file into memory and returns its content. When a filename is supplied, it writes the file to the specified location and returns the location. For file sizes that exceed the available memory it is recommended to write to a file. :param bucket: The bucket to fetch from. :type bucket: str :param object: The object to fetch. :type object: str :param filename: If set, a local file path where the file should be written to. :type filename: str """ client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.blob(blob_name=object) if filename: blob.download_to_filename(filename) self.log.info('File downloaded to %s', filename) return filename else: return blob.download_as_string()
# pylint:disable=redefined-builtin
[docs] def upload(self, bucket, object, filename, mime_type='application/octet-stream', gzip=False, multipart=None, num_retries=None): """ Uploads a local file to Google Cloud Storage. :param bucket: The bucket to upload to. :type bucket: str :param object: The object name to set when uploading the local file. :type object: str :param filename: The local file path to the file to be uploaded. :type filename: str :param mime_type: The MIME type to set when uploading the file. :type mime_type: str :param gzip: Option to compress file for upload :type gzip: bool """ if multipart is not None: warnings.warn("'multipart' parameter is deprecated." " It is handled automatically by the Storage client", DeprecationWarning) if num_retries is not None: warnings.warn("'num_retries' parameter is deprecated." " It is handled automatically by the Storage client", DeprecationWarning) if gzip: filename_gz = filename + '.gz' with open(filename, 'rb') as f_in: with gz.open(filename_gz, 'wb') as f_out: shutil.copyfileobj(f_in, f_out) filename = filename_gz client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.blob(blob_name=object) blob.upload_from_filename(filename=filename, content_type=mime_type) if gzip: os.remove(filename) self.log.info('File %s uploaded to %s in %s bucket', filename, object, bucket)
# pylint:disable=redefined-builtin
[docs] def exists(self, bucket, object): """ Checks for the existence of a file in Google Cloud Storage. :param bucket: The Google cloud storage bucket where the object is. :type bucket: str :param object: The name of the object to check in the Google cloud storage bucket. :type object: str """ client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.blob(blob_name=object) return blob.exists()
# pylint:disable=redefined-builtin
[docs] def is_updated_after(self, bucket, object, ts): """ Checks if an object is updated in Google Cloud Storage. :param bucket: The Google cloud storage bucket where the object is. :type bucket: str :param object: The name of the object to check in the Google cloud storage bucket. :type object: str :param ts: The timestamp to check against. :type ts: datetime.datetime """ client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.get_blob(blob_name=object) if blob is None: raise ValueError("Object ({}) not found in Bucket ({})".format( object, bucket)) blob_update_time = blob.updated if blob_update_time is not None: import dateutil.tz if not ts.tzinfo: ts = ts.replace(tzinfo=dateutil.tz.tzutc()) self.log.info("Verify object date: %s > %s", blob_update_time, ts) if blob_update_time > ts: return True return False
[docs] def delete(self, bucket, object, generation=None): """ Deletes an object from the bucket. :param bucket: name of the bucket, where the object resides :type bucket: str :param object: name of the object to delete :type object: str """ if generation is not None: warnings.warn("'generation' parameter is no longer supported", DeprecationWarning) client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.blob(blob_name=object) blob.delete() self.log.info('Blob %s deleted.', object)
[docs] def list(self, bucket, versions=None, maxResults=None, prefix=None, delimiter=None): """ List all objects from the bucket with the give string prefix in name :param bucket: bucket name :type bucket: str :param versions: if true, list all versions of the objects :type versions: bool :param maxResults: max count of items to return in a single page of responses :type maxResults: int :param prefix: prefix string which filters objects whose name begin with this prefix :type prefix: str :param delimiter: filters objects based on the delimiter (for e.g '.csv') :type delimiter: str :return: a stream of object names matching the filtering criteria """ client = self.get_conn() bucket = client.bucket(bucket) ids = [] pageToken = None while True: blobs = bucket.list_blobs( max_results=maxResults, page_token=pageToken, prefix=prefix, delimiter=delimiter, versions=versions ) blob_names = [] for blob in blobs: blob_names.append(blob.name) prefixes = blobs.prefixes if prefixes: ids += list(prefixes) else: ids += blob_names pageToken = blobs.next_page_token if pageToken is None: # empty next page token break return ids
[docs] def get_size(self, bucket, object): """ Gets the size of a file in Google Cloud Storage in bytes. :param bucket: The Google cloud storage bucket where the object is. :type bucket: str :param object: The name of the object to check in the Google cloud storage bucket. :type object: str """ self.log.info('Checking the file size of object: %s in bucket: %s', object, bucket) client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.get_blob(blob_name=object) blob_size = blob.size self.log.info('The file size of %s is %s bytes.', object, blob_size) return blob_size
[docs] def get_crc32c(self, bucket, object): """ Gets the CRC32c checksum of an object in Google Cloud Storage. :param bucket: The Google cloud storage bucket where the object is. :type bucket: str :param object: The name of the object to check in the Google cloud storage bucket. :type object: str """ self.log.info('Retrieving the crc32c checksum of ' 'object: %s in bucket: %s', object, bucket) client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.get_blob(blob_name=object) blob_crc32c = blob.crc32c self.log.info('The crc32c checksum of %s is %s', object, blob_crc32c) return blob_crc32c
[docs] def get_md5hash(self, bucket, object): """ Gets the MD5 hash of an object in Google Cloud Storage. :param bucket: The Google cloud storage bucket where the object is. :type bucket: str :param object: The name of the object to check in the Google cloud storage bucket. :type object: str """ self.log.info('Retrieving the MD5 hash of ' 'object: %s in bucket: %s', object, bucket) client = self.get_conn() bucket = client.bucket(bucket) blob = bucket.get_blob(blob_name=object) blob_md5hash = blob.md5_hash self.log.info('The md5Hash of %s is %s', object, blob_md5hash) return blob_md5hash
@GoogleCloudBaseHook.catch_http_exception @GoogleCloudBaseHook.fallback_to_default_project_id
[docs] def create_bucket(self, bucket_name, resource=None, storage_class='MULTI_REGIONAL', location='US', project_id=None, labels=None ): """ Creates a new bucket. Google Cloud Storage uses a flat namespace, so you can't create a bucket with a name that is already in use. .. seealso:: For more information, see Bucket Naming Guidelines: https://cloud.google.com/storage/docs/bucketnaming.html#requirements :param bucket_name: The name of the bucket. :type bucket_name: str :param resource: An optional dict with parameters for creating the bucket. For information on available parameters, see Cloud Storage API doc: https://cloud.google.com/storage/docs/json_api/v1/buckets/insert :type resource: dict :param storage_class: This defines how objects in the bucket are stored and determines the SLA and the cost of storage. Values include - ``MULTI_REGIONAL`` - ``REGIONAL`` - ``STANDARD`` - ``NEARLINE`` - ``COLDLINE``. If this value is not specified when the bucket is created, it will default to STANDARD. :type storage_class: str :param location: The location of the bucket. Object data for objects in the bucket resides in physical storage within this region. Defaults to US. .. seealso:: https://developers.google.com/storage/docs/bucket-locations :type location: str :param project_id: The ID of the GCP Project. :type project_id: str :param labels: User-provided labels, in key/value pairs. :type labels: dict :return: If successful, it returns the ``id`` of the bucket. """ self.log.info('Creating Bucket: %s; Location: %s; Storage Class: %s', bucket_name, location, storage_class) client = self.get_conn() bucket = client.bucket(bucket_name=bucket_name) bucket_resource = resource or {} for item in bucket_resource: if item != "name": bucket._patch_property(name=item, value=resource[item]) bucket.storage_class = storage_class bucket.labels = labels or {} bucket.create(project=project_id, location=location) return bucket.id
[docs] def insert_bucket_acl(self, bucket, entity, role, user_project=None): """ Creates a new ACL entry on the specified bucket. See: https://cloud.google.com/storage/docs/json_api/v1/bucketAccessControls/insert :param bucket: Name of a bucket. :type bucket: str :param entity: The entity holding the permission, in one of the following forms: user-userId, user-email, group-groupId, group-email, domain-domain, project-team-projectId, allUsers, allAuthenticatedUsers. See: https://cloud.google.com/storage/docs/access-control/lists#scopes :type entity: str :param role: The access permission for the entity. Acceptable values are: "OWNER", "READER", "WRITER". :type role: str :param user_project: (Optional) The project to be billed for this request. Required for Requester Pays buckets. :type user_project: str """ self.log.info('Creating a new ACL entry in bucket: %s', bucket) client = self.get_conn() bucket = client.bucket(bucket_name=bucket) bucket.acl.reload() bucket.acl.entity_from_dict(entity_dict={"entity": entity, "role": role}) if user_project: bucket.acl.user_project = user_project bucket.acl.save() self.log.info('A new ACL entry created in bucket: %s', bucket)
[docs] def insert_object_acl(self, bucket, object_name, entity, role, generation=None, user_project=None): """ Creates a new ACL entry on the specified object. See: https://cloud.google.com/storage/docs/json_api/v1/objectAccessControls/insert :param bucket: Name of a bucket. :type bucket: str :param object_name: Name of the object. For information about how to URL encode object names to be path safe, see: https://cloud.google.com/storage/docs/json_api/#encoding :type object_name: str :param entity: The entity holding the permission, in one of the following forms: user-userId, user-email, group-groupId, group-email, domain-domain, project-team-projectId, allUsers, allAuthenticatedUsers See: https://cloud.google.com/storage/docs/access-control/lists#scopes :type entity: str :param role: The access permission for the entity. Acceptable values are: "OWNER", "READER". :type role: str :param user_project: (Optional) The project to be billed for this request. Required for Requester Pays buckets. :type user_project: str """ if generation is not None: warnings.warn("'generation' parameter is no longer supported", DeprecationWarning) self.log.info('Creating a new ACL entry for object: %s in bucket: %s', object_name, bucket) client = self.get_conn() bucket = client.bucket(bucket_name=bucket) blob = bucket.blob(object_name) # Reload fetches the current ACL from Cloud Storage. blob.acl.reload() blob.acl.entity_from_dict(entity_dict={"entity": entity, "role": role}) if user_project: blob.acl.user_project = user_project blob.acl.save() self.log.info('A new ACL entry created for object: %s in bucket: %s', object_name, bucket)
[docs] def compose(self, bucket, source_objects, destination_object, num_retries=None): """ Composes a list of existing object into a new object in the same storage bucket Currently it only supports up to 32 objects that can be concatenated in a single operation https://cloud.google.com/storage/docs/json_api/v1/objects/compose :param bucket: The name of the bucket containing the source objects. This is also the same bucket to store the composed destination object. :type bucket: str :param source_objects: The list of source objects that will be composed into a single object. :type source_objects: list :param destination_object: The path of the object if given. :type destination_object: str """ if num_retries is not None: warnings.warn("'num_retries' parameter is Deprecated. Retries are " "now handled automatically", DeprecationWarning) if not source_objects or not len(source_objects): raise ValueError('source_objects cannot be empty.') if not bucket or not destination_object: raise ValueError('bucket and destination_object cannot be empty.') self.log.info("Composing %s to %s in the bucket %s", source_objects, destination_object, bucket) client = self.get_conn() bucket = client.bucket(bucket) destination_blob = bucket.blob(destination_object) destination_blob.compose( sources=[ bucket.blob(blob_name=source_object) for source_object in source_objects ]) self.log.info("Completed successfully.")
[docs]def _parse_gcs_url(gsurl): """ Given a Google Cloud Storage URL (gs://<bucket>/<blob>), returns a tuple containing the corresponding bucket and blob. """ # Python 3 try: from urllib.parse import urlparse # Python 2 except ImportError: from urlparse import urlparse parsed_url = urlparse(gsurl) if not parsed_url.netloc: raise AirflowException('Please provide a bucket name') else: bucket = parsed_url.netloc # Remove leading '/' but NOT trailing one blob = parsed_url.path.lstrip('/') return bucket, blob