#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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.
#
"""This module contains a Google Cloud Storage hook."""
import functools
import gzip as gz
import os
import shutil
import time
from contextlib import contextmanager
from datetime import datetime
from functools import partial
from io import BytesIO
from os import path
from tempfile import NamedTemporaryFile
from typing import Callable, List, Optional, Sequence, Set, Tuple, TypeVar, Union, cast, overload
from urllib.parse import urlparse
from google.api_core.exceptions import NotFound
# not sure why but mypy complains on missing `storage` but it is clearly there and is importable
from google.cloud import storage # type: ignore[attr-defined]
from google.cloud.exceptions import GoogleCloudError
from airflow.exceptions import AirflowException
from airflow.providers.google.cloud.utils.helpers import normalize_directory_path
from airflow.providers.google.common.consts import CLIENT_INFO
from airflow.providers.google.common.hooks.base_google import GoogleBaseHook
from airflow.utils import timezone
from airflow.version import version
[docs]T = TypeVar("T", bound=Callable)
# Use default timeout from google-cloud-storage
def _fallback_object_url_to_object_name_and_bucket_name(
object_url_keyword_arg_name='object_url',
bucket_name_keyword_arg_name='bucket_name',
object_name_keyword_arg_name='object_name',
) -> Callable[[T], T]:
"""
Decorator factory that convert object URL parameter to object name and bucket name parameter.
:param object_url_keyword_arg_name: Name of the object URL parameter
:param bucket_name_keyword_arg_name: Name of the bucket name parameter
:param object_name_keyword_arg_name: Name of the object name parameter
:return: Decorator
"""
def _wrapper(func: T):
@functools.wraps(func)
def _inner_wrapper(self: "GCSHook", *args, **kwargs) -> RT:
if args:
raise AirflowException(
"You must use keyword arguments in this methods rather than positional"
)
object_url = kwargs.get(object_url_keyword_arg_name)
bucket_name = kwargs.get(bucket_name_keyword_arg_name)
object_name = kwargs.get(object_name_keyword_arg_name)
if object_url and bucket_name and object_name:
raise AirflowException(
"The mutually exclusive parameters. `object_url`, `bucket_name` together "
"with `object_name` parameters are present. "
"Please provide `object_url` or `bucket_name` and `object_name`."
)
if object_url:
bucket_name, object_name = _parse_gcs_url(object_url)
kwargs[bucket_name_keyword_arg_name] = bucket_name
kwargs[object_name_keyword_arg_name] = object_name
del kwargs[object_url_keyword_arg_name]
if not object_name or not bucket_name:
raise TypeError(
f"{func.__name__}() missing 2 required positional arguments: "
f"'{bucket_name_keyword_arg_name}' and '{object_name_keyword_arg_name}' "
f"or {object_url_keyword_arg_name}"
)
if not object_name:
raise TypeError(
f"{func.__name__}() missing 1 required positional argument: "
f"'{object_name_keyword_arg_name}'"
)
if not bucket_name:
raise TypeError(
f"{func.__name__}() missing 1 required positional argument: "
f"'{bucket_name_keyword_arg_name}'"
)
return func(self, *args, **kwargs)
return cast(T, _inner_wrapper)
return _wrapper
# A fake bucket to use in functions decorated by _fallback_object_url_to_object_name_and_bucket_name.
# This allows the 'bucket' argument to be of type str instead of Optional[str],
# making it easier to type hint the function body without dealing with the None
# case that can never happen at runtime.
[docs]PROVIDE_BUCKET: str = cast(str, None)
[docs]class GCSHook(GoogleBaseHook):
"""
Interact with Google Cloud Storage. This hook uses the Google Cloud
connection.
"""
_conn = None # type: Optional[storage.Client]
def __init__(
self,
gcp_conn_id: str = "google_cloud_default",
delegate_to: Optional[str] = None,
impersonation_chain: Optional[Union[str, Sequence[str]]] = None,
) -> None:
super().__init__(
gcp_conn_id=gcp_conn_id,
delegate_to=delegate_to,
impersonation_chain=impersonation_chain,
)
[docs] def get_conn(self) -> storage.Client:
"""Returns a Google Cloud Storage service object."""
if not self._conn:
self._conn = storage.Client(
credentials=self._get_credentials(), client_info=CLIENT_INFO, project=self.project_id
)
return self._conn
[docs] def copy(
self,
source_bucket: str,
source_object: str,
destination_bucket: Optional[str] = None,
destination_object: Optional[str] = None,
) -> 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.
:param source_object: The object to copy.
:param destination_bucket: The destination of the object to copied to.
Can be omitted; then the same bucket is used.
:param destination_object: The (renamed) path of the object if given.
Can be omitted; then the same name is used.
"""
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(
f'Either source/destination bucket or source/destination object must be different, '
f'not both the same: bucket={source_bucket}, object={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) # type: ignore[attr-defined]
destination_bucket = client.bucket(destination_bucket)
destination_object = source_bucket.copy_blob( # type: ignore[attr-defined]
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, # type: ignore[attr-defined]
source_bucket.name, # type: ignore[attr-defined]
destination_object.name, # type: ignore[union-attr]
destination_bucket.name, # type: ignore[union-attr]
)
[docs] def rewrite(
self,
source_bucket: str,
source_object: str,
destination_bucket: str,
destination_object: Optional[str] = None,
) -> 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.
:param source_object: The object to copy.
:param destination_bucket: The destination of the object to copied to.
: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(
f'Either source/destination bucket or source/destination object must be different, '
f'not both the same: bucket={source_bucket}, object={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) # type: ignore[attr-defined]
destination_bucket = client.bucket(destination_bucket)
token, bytes_rewritten, total_bytes = destination_bucket.blob( # type: ignore[attr-defined]
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( # type: ignore[attr-defined]
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 rewritten to object %s in bucket %s',
source_object.name, # type: ignore[attr-defined]
source_bucket.name, # type: ignore[attr-defined]
destination_object,
destination_bucket.name, # type: ignore[attr-defined]
)
@overload
[docs] def download(
self,
bucket_name: str,
object_name: str,
filename: None = None,
chunk_size: Optional[int] = None,
timeout: Optional[int] = DEFAULT_TIMEOUT,
num_max_attempts: Optional[int] = 1,
) -> bytes:
...
@overload
def download(
self,
bucket_name: str,
object_name: str,
filename: str,
chunk_size: Optional[int] = None,
timeout: Optional[int] = DEFAULT_TIMEOUT,
num_max_attempts: Optional[int] = 1,
) -> str:
...
def download(
self,
bucket_name: str,
object_name: str,
filename: Optional[str] = None,
chunk_size: Optional[int] = None,
timeout: Optional[int] = DEFAULT_TIMEOUT,
num_max_attempts: Optional[int] = 1,
) -> Union[str, bytes]:
"""
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_name: The bucket to fetch from.
:param object_name: The object to fetch.
:param filename: If set, a local file path where the file should be written to.
:param chunk_size: Blob chunk size.
:param timeout: Request timeout in seconds.
:param num_max_attempts: Number of attempts to download the file.
"""
# TODO: future improvement check file size before downloading,
# to check for local space availability
num_file_attempts = 0
while True:
try:
num_file_attempts += 1
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.blob(blob_name=object_name, chunk_size=chunk_size)
if filename:
blob.download_to_filename(filename, timeout=timeout)
self.log.info('File downloaded to %s', filename)
return filename
else:
return blob.download_as_bytes()
except GoogleCloudError:
if num_file_attempts == num_max_attempts:
self.log.error(
'Download attempt of object: %s from %s has failed. Attempt: %s, max %s.',
object_name,
object_name,
num_file_attempts,
num_max_attempts,
)
raise
# Wait with exponential backoff scheme before retrying.
timeout_seconds = 1.0 * 2 ** (num_file_attempts - 1)
time.sleep(timeout_seconds)
continue
[docs] def download_as_byte_array(
self,
bucket_name: str,
object_name: str,
chunk_size: Optional[int] = None,
timeout: Optional[int] = DEFAULT_TIMEOUT,
num_max_attempts: Optional[int] = 1,
) -> bytes:
"""
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_name: The bucket to fetch from.
:param object_name: The object to fetch.
:param chunk_size: Blob chunk size.
:param timeout: Request timeout in seconds.
:param num_max_attempts: Number of attempts to download the file.
"""
# We do not pass filename, so will never receive string as response
return self.download(
bucket_name=bucket_name,
object_name=object_name,
chunk_size=chunk_size,
timeout=timeout,
num_max_attempts=num_max_attempts,
)
@_fallback_object_url_to_object_name_and_bucket_name()
@contextmanager
[docs] def provide_file(
self,
bucket_name: str = PROVIDE_BUCKET,
object_name: Optional[str] = None,
object_url: Optional[str] = None,
dir: Optional[str] = None,
):
"""
Downloads the file to a temporary directory and returns a file handle
You can use this method by passing the bucket_name and object_name parameters
or just object_url parameter.
:param bucket_name: The bucket to fetch from.
:param object_name: The object to fetch.
:param object_url: File reference url. Must start with "gs: //"
:param dir: The tmp sub directory to download the file to. (passed to NamedTemporaryFile)
:return: File handler
"""
if object_name is None:
raise ValueError("Object name can not be empty")
_, _, file_name = object_name.rpartition("/")
with NamedTemporaryFile(suffix=file_name, dir=dir) as tmp_file:
self.download(bucket_name=bucket_name, object_name=object_name, filename=tmp_file.name)
tmp_file.flush()
yield tmp_file
@_fallback_object_url_to_object_name_and_bucket_name()
@contextmanager
[docs] def provide_file_and_upload(
self,
bucket_name: str = PROVIDE_BUCKET,
object_name: Optional[str] = None,
object_url: Optional[str] = None,
):
"""
Creates temporary file, returns a file handle and uploads the files content
on close.
You can use this method by passing the bucket_name and object_name parameters
or just object_url parameter.
:param bucket_name: The bucket to fetch from.
:param object_name: The object to fetch.
:param object_url: File reference url. Must start with "gs: //"
:return: File handler
"""
if object_name is None:
raise ValueError("Object name can not be empty")
_, _, file_name = object_name.rpartition("/")
with NamedTemporaryFile(suffix=file_name) as tmp_file:
yield tmp_file
tmp_file.flush()
self.upload(bucket_name=bucket_name, object_name=object_name, filename=tmp_file.name)
[docs] def upload(
self,
bucket_name: str,
object_name: str,
filename: Optional[str] = None,
data: Optional[Union[str, bytes]] = None,
mime_type: Optional[str] = None,
gzip: bool = False,
encoding: str = 'utf-8',
chunk_size: Optional[int] = None,
timeout: Optional[int] = DEFAULT_TIMEOUT,
num_max_attempts: int = 1,
metadata: Optional[dict] = None,
) -> None:
"""
Uploads a local file or file data as string or bytes to Google Cloud Storage.
:param bucket_name: The bucket to upload to.
:param object_name: The object name to set when uploading the file.
:param filename: The local file path to the file to be uploaded.
:param data: The file's data as a string or bytes to be uploaded.
:param mime_type: The file's mime type set when uploading the file.
:param gzip: Option to compress local file or file data for upload
:param encoding: bytes encoding for file data if provided as string
:param chunk_size: Blob chunk size.
:param timeout: Request timeout in seconds.
:param num_max_attempts: Number of attempts to try to upload the file.
:param metadata: The metadata to be uploaded with the file.
"""
def _call_with_retry(f: Callable[[], None]) -> None:
"""Helper functions to upload a file or a string with a retry mechanism and exponential back-off.
:param f: Callable that should be retried.
"""
num_file_attempts = 0
while num_file_attempts < num_max_attempts:
try:
num_file_attempts += 1
f()
except GoogleCloudError as e:
if num_file_attempts == num_max_attempts:
self.log.error(
'Upload attempt of object: %s from %s has failed. Attempt: %s, max %s.',
object_name,
object_name,
num_file_attempts,
num_max_attempts,
)
raise e
# Wait with exponential backoff scheme before retrying.
timeout_seconds = 1.0 * 2 ** (num_file_attempts - 1)
time.sleep(timeout_seconds)
continue
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.blob(blob_name=object_name, chunk_size=chunk_size)
if metadata:
blob.metadata = metadata
if filename and data:
raise ValueError(
"'filename' and 'data' parameter provided. Please "
"specify a single parameter, either 'filename' for "
"local file uploads or 'data' for file content uploads."
)
elif filename:
if not mime_type:
mime_type = 'application/octet-stream'
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
_call_with_retry(
partial(blob.upload_from_filename, filename=filename, content_type=mime_type, timeout=timeout)
)
if gzip:
os.remove(filename)
self.log.info('File %s uploaded to %s in %s bucket', filename, object_name, bucket_name)
elif data:
if not mime_type:
mime_type = 'text/plain'
if gzip:
if isinstance(data, str):
data = bytes(data, encoding)
out = BytesIO()
with gz.GzipFile(fileobj=out, mode="w") as f:
f.write(data)
data = out.getvalue()
_call_with_retry(partial(blob.upload_from_string, data, content_type=mime_type, timeout=timeout))
self.log.info('Data stream uploaded to %s in %s bucket', object_name, bucket_name)
else:
raise ValueError("'filename' and 'data' parameter missing. One is required to upload to gcs.")
[docs] def exists(self, bucket_name: str, object_name: str) -> bool:
"""
Checks for the existence of a file in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the object is.
:param object_name: The name of the blob_name to check in the Google cloud
storage bucket.
"""
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.blob(blob_name=object_name)
return blob.exists()
[docs] def get_blob_update_time(self, bucket_name: str, object_name: str):
"""
Get the update time of a file in Google Cloud Storage
:param bucket_name: The Google Cloud Storage bucket where the object is.
:param object_name: The name of the blob to get updated time from the Google cloud
storage bucket.
"""
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.get_blob(blob_name=object_name)
if blob is None:
raise ValueError(f"Object ({object_name}) not found in Bucket ({bucket_name})")
return blob.updated
[docs] def is_updated_after(self, bucket_name: str, object_name: str, ts: datetime) -> bool:
"""
Checks if an blob_name is updated in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the object is.
:param object_name: The name of the object to check in the Google cloud
storage bucket.
:param ts: The timestamp to check against.
"""
blob_update_time = self.get_blob_update_time(bucket_name, object_name)
if blob_update_time is not None:
if not ts.tzinfo:
ts = ts.replace(tzinfo=timezone.utc)
self.log.info("Verify object date: %s > %s", blob_update_time, ts)
if blob_update_time > ts:
return True
return False
[docs] def is_updated_between(
self, bucket_name: str, object_name: str, min_ts: datetime, max_ts: datetime
) -> bool:
"""
Checks if an blob_name is updated in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the object is.
:param object_name: The name of the object to check in the Google cloud
storage bucket.
:param min_ts: The minimum timestamp to check against.
:param max_ts: The maximum timestamp to check against.
"""
blob_update_time = self.get_blob_update_time(bucket_name, object_name)
if blob_update_time is not None:
if not min_ts.tzinfo:
min_ts = min_ts.replace(tzinfo=timezone.utc)
if not max_ts.tzinfo:
max_ts = max_ts.replace(tzinfo=timezone.utc)
self.log.info("Verify object date: %s is between %s and %s", blob_update_time, min_ts, max_ts)
if min_ts <= blob_update_time < max_ts:
return True
return False
[docs] def is_updated_before(self, bucket_name: str, object_name: str, ts: datetime) -> bool:
"""
Checks if an blob_name is updated before given time in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the object is.
:param object_name: The name of the object to check in the Google cloud
storage bucket.
:param ts: The timestamp to check against.
"""
blob_update_time = self.get_blob_update_time(bucket_name, object_name)
if blob_update_time is not None:
if not ts.tzinfo:
ts = ts.replace(tzinfo=timezone.utc)
self.log.info("Verify object date: %s < %s", blob_update_time, ts)
if blob_update_time < ts:
return True
return False
[docs] def is_older_than(self, bucket_name: str, object_name: str, seconds: int) -> bool:
"""
Check if object is older than given time
:param bucket_name: The Google Cloud Storage bucket where the object is.
:param object_name: The name of the object to check in the Google cloud
storage bucket.
:param seconds: The time in seconds to check against
"""
blob_update_time = self.get_blob_update_time(bucket_name, object_name)
if blob_update_time is not None:
from datetime import timedelta
current_time = timezone.utcnow()
given_time = current_time - timedelta(seconds=seconds)
self.log.info("Verify object date: %s is older than %s", blob_update_time, given_time)
if blob_update_time < given_time:
return True
return False
[docs] def delete(self, bucket_name: str, object_name: str) -> None:
"""
Deletes an object from the bucket.
:param bucket_name: name of the bucket, where the object resides
:param object_name: name of the object to delete
"""
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.blob(blob_name=object_name)
blob.delete()
self.log.info('Blob %s deleted.', object_name)
[docs] def delete_bucket(self, bucket_name: str, force: bool = False) -> None:
"""
Delete a bucket object from the Google Cloud Storage.
:param bucket_name: name of the bucket which will be deleted
:param force: false not allow to delete non empty bucket, set force=True
allows to delete non empty bucket
"""
client = self.get_conn()
bucket = client.bucket(bucket_name)
self.log.info("Deleting %s bucket", bucket_name)
try:
bucket.delete(force=force)
self.log.info("Bucket %s has been deleted", bucket_name)
except NotFound:
self.log.info("Bucket %s not exists", bucket_name)
[docs] def list(self, bucket_name, versions=None, max_results=None, prefix=None, delimiter=None) -> list:
"""
List all objects from the bucket with the give string prefix in name
:param bucket_name: bucket name
:param versions: if true, list all versions of the objects
:param max_results: max count of items to return in a single page of responses
:param prefix: prefix string which filters objects whose name begin with
this prefix
:param delimiter: filters objects based on the delimiter (for e.g '.csv')
:return: a stream of object names matching the filtering criteria
"""
client = self.get_conn()
bucket = client.bucket(bucket_name)
ids = []
page_token = None
while True:
blobs = bucket.list_blobs(
max_results=max_results,
page_token=page_token,
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
page_token = blobs.next_page_token
if page_token is None:
# empty next page token
break
return ids
[docs] def list_by_timespan(
self,
bucket_name: str,
timespan_start: datetime,
timespan_end: datetime,
versions: Optional[bool] = None,
max_results: Optional[int] = None,
prefix: Optional[str] = None,
delimiter: Optional[str] = None,
) -> List[str]:
"""
List all objects from the bucket with the give string prefix in name that were
updated in the time between ``timespan_start`` and ``timespan_end``.
:param bucket_name: bucket name
:param timespan_start: will return objects that were updated at or after this datetime (UTC)
:param timespan_end: will return objects that were updated before this datetime (UTC)
:param versions: if true, list all versions of the objects
:param max_results: max count of items to return in a single page of responses
:param prefix: prefix string which filters objects whose name begin with
this prefix
:param delimiter: filters objects based on the delimiter (for e.g '.csv')
:return: a stream of object names matching the filtering criteria
"""
client = self.get_conn()
bucket = client.bucket(bucket_name)
ids = []
page_token = None
while True:
blobs = bucket.list_blobs(
max_results=max_results,
page_token=page_token,
prefix=prefix,
delimiter=delimiter,
versions=versions,
)
blob_names = []
for blob in blobs:
if timespan_start <= blob.updated.replace(tzinfo=timezone.utc) < timespan_end:
blob_names.append(blob.name)
prefixes = blobs.prefixes
if prefixes:
ids += list(prefixes)
else:
ids += blob_names
page_token = blobs.next_page_token
if page_token is None:
# empty next page token
break
return ids
[docs] def get_size(self, bucket_name: str, object_name: str) -> int:
"""
Gets the size of a file in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the blob_name is.
:param object_name: The name of the object to check in the Google
cloud storage bucket_name.
"""
self.log.info('Checking the file size of object: %s in bucket_name: %s', object_name, bucket_name)
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.get_blob(blob_name=object_name)
blob_size = blob.size
self.log.info('The file size of %s is %s bytes.', object_name, blob_size)
return blob_size
[docs] def get_crc32c(self, bucket_name: str, object_name: str):
"""
Gets the CRC32c checksum of an object in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the blob_name is.
:param object_name: The name of the object to check in the Google cloud
storage bucket_name.
"""
self.log.info(
'Retrieving the crc32c checksum of object_name: %s in bucket_name: %s',
object_name,
bucket_name,
)
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.get_blob(blob_name=object_name)
blob_crc32c = blob.crc32c
self.log.info('The crc32c checksum of %s is %s', object_name, blob_crc32c)
return blob_crc32c
[docs] def get_md5hash(self, bucket_name: str, object_name: str) -> str:
"""
Gets the MD5 hash of an object in Google Cloud Storage.
:param bucket_name: The Google Cloud Storage bucket where the blob_name is.
:param object_name: The name of the object to check in the Google cloud
storage bucket_name.
"""
self.log.info('Retrieving the MD5 hash of object: %s in bucket: %s', object_name, bucket_name)
client = self.get_conn()
bucket = client.bucket(bucket_name)
blob = bucket.get_blob(blob_name=object_name)
blob_md5hash = blob.md5_hash
self.log.info('The md5Hash of %s is %s', object_name, blob_md5hash)
return blob_md5hash
@GoogleBaseHook.fallback_to_default_project_id
[docs] def create_bucket(
self,
bucket_name: str,
resource: Optional[dict] = None,
storage_class: str = 'MULTI_REGIONAL',
location: str = 'US',
project_id: Optional[str] = None,
labels: Optional[dict] = None,
) -> str:
"""
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.
: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
: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.
: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
:param project_id: The ID of the Google Cloud Project.
:param labels: User-provided labels, in key/value pairs.
: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
)
# Add airflow-version label to the bucket
labels = labels or {}
labels['airflow-version'] = 'v' + version.replace('.', '-').replace('+', '-')
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]) # type: ignore[index]
bucket.storage_class = storage_class
bucket.labels = labels
bucket.create(project=project_id, location=location)
return bucket.id
[docs] def insert_bucket_acl(
self, bucket_name: str, entity: str, role: str, user_project: Optional[str] = None
) -> None:
"""
Creates a new ACL entry on the specified bucket_name.
See: https://cloud.google.com/storage/docs/json_api/v1/bucketAccessControls/insert
:param bucket_name: Name of a bucket_name.
: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
:param role: The access permission for the entity.
Acceptable values are: "OWNER", "READER", "WRITER".
:param user_project: (Optional) The project to be billed for this request.
Required for Requester Pays buckets.
"""
self.log.info('Creating a new ACL entry in bucket: %s', bucket_name)
client = self.get_conn()
bucket = client.bucket(bucket_name=bucket_name)
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_name)
[docs] def insert_object_acl(
self,
bucket_name: str,
object_name: str,
entity: str,
role: str,
generation: Optional[int] = None,
user_project: Optional[str] = None,
) -> 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: Name of a bucket_name.
: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
: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
:param role: The access permission for the entity.
Acceptable values are: "OWNER", "READER".
:param generation: Optional. If present, selects a specific revision of this object.
:param user_project: (Optional) The project to be billed for this request.
Required for Requester Pays buckets.
"""
self.log.info('Creating a new ACL entry for object: %s in bucket: %s', object_name, bucket_name)
client = self.get_conn()
bucket = client.bucket(bucket_name=bucket_name)
blob = bucket.blob(blob_name=object_name, generation=generation)
# 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_name)
[docs] def compose(self, bucket_name: str, source_objects: List, destination_object: str) -> None:
"""
Composes a list of existing object into a new object in the same storage bucket_name
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_name: The name of the bucket containing the source objects.
This is also the same bucket to store the composed destination object.
:param source_objects: The list of source objects that will be composed
into a single object.
:param destination_object: The path of the object if given.
"""
if not source_objects:
raise ValueError('source_objects cannot be empty.')
if not bucket_name or not destination_object:
raise ValueError('bucket_name and destination_object cannot be empty.')
self.log.info("Composing %s to %s in the bucket %s", source_objects, destination_object, bucket_name)
client = self.get_conn()
bucket = client.bucket(bucket_name)
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 sync(
self,
source_bucket: str,
destination_bucket: str,
source_object: Optional[str] = None,
destination_object: Optional[str] = None,
recursive: bool = True,
allow_overwrite: bool = False,
delete_extra_files: bool = False,
) -> None:
"""
Synchronizes the contents of the buckets.
Parameters ``source_object`` and ``destination_object`` describe the root sync directories. If they
are not passed, the entire bucket will be synchronized. If they are passed, they should point
to directories.
.. note::
The synchronization of individual files is not supported. Only entire directories can be
synchronized.
:param source_bucket: The name of the bucket containing the source objects.
:param destination_bucket: The name of the bucket containing the destination objects.
:param source_object: The root sync directory in the source bucket.
:param destination_object: The root sync directory in the destination bucket.
:param recursive: If True, subdirectories will be considered
:param recursive: If True, subdirectories will be considered
:param allow_overwrite: if True, the files will be overwritten if a mismatched file is found.
By default, overwriting files is not allowed
:param delete_extra_files: if True, deletes additional files from the source that not found in the
destination. By default extra files are not deleted.
.. note::
This option can delete data quickly if you specify the wrong source/destination combination.
:return: none
"""
client = self.get_conn()
# Create bucket object
source_bucket_obj = client.bucket(source_bucket)
destination_bucket_obj = client.bucket(destination_bucket)
# Normalize parameters when they are passed
source_object = normalize_directory_path(source_object)
destination_object = normalize_directory_path(destination_object)
# Calculate the number of characters that remove from the name, because they contain information
# about the parent's path
source_object_prefix_len = len(source_object) if source_object else 0
# Prepare synchronization plan
to_copy_blobs, to_delete_blobs, to_rewrite_blobs = self._prepare_sync_plan(
source_bucket=source_bucket_obj,
destination_bucket=destination_bucket_obj,
source_object=source_object,
destination_object=destination_object,
recursive=recursive,
)
self.log.info(
"Planned synchronization. To delete blobs count: %s, to upload blobs count: %s, "
"to rewrite blobs count: %s",
len(to_delete_blobs),
len(to_copy_blobs),
len(to_rewrite_blobs),
)
# Copy missing object to new bucket
if not to_copy_blobs:
self.log.info("Skipped blobs copying.")
else:
for blob in to_copy_blobs:
dst_object = self._calculate_sync_destination_path(
blob, destination_object, source_object_prefix_len
)
self.copy(
source_bucket=source_bucket_obj.name,
source_object=blob.name,
destination_bucket=destination_bucket_obj.name,
destination_object=dst_object,
)
self.log.info("Blobs copied.")
# Delete redundant files
if not to_delete_blobs:
self.log.info("Skipped blobs deleting.")
elif delete_extra_files:
# TODO: Add batch. I tried to do it, but the Google library is not stable at the moment.
for blob in to_delete_blobs:
self.delete(blob.bucket.name, blob.name)
self.log.info("Blobs deleted.")
# Overwrite files that are different
if not to_rewrite_blobs:
self.log.info("Skipped blobs overwriting.")
elif allow_overwrite:
for blob in to_rewrite_blobs:
dst_object = self._calculate_sync_destination_path(
blob, destination_object, source_object_prefix_len
)
self.rewrite(
source_bucket=source_bucket_obj.name,
source_object=blob.name,
destination_bucket=destination_bucket_obj.name,
destination_object=dst_object,
)
self.log.info("Blobs rewritten.")
self.log.info("Synchronization finished.")
def _calculate_sync_destination_path(
self, blob: storage.Blob, destination_object: Optional[str], source_object_prefix_len: int
) -> str:
return (
path.join(destination_object, blob.name[source_object_prefix_len:])
if destination_object
else blob.name[source_object_prefix_len:]
)
@staticmethod
def _prepare_sync_plan(
source_bucket: storage.Bucket,
destination_bucket: storage.Bucket,
source_object: Optional[str],
destination_object: Optional[str],
recursive: bool,
) -> Tuple[Set[storage.Blob], Set[storage.Blob], Set[storage.Blob]]:
# Calculate the number of characters that remove from the name, because they contain information
# about the parent's path
source_object_prefix_len = len(source_object) if source_object else 0
destination_object_prefix_len = len(destination_object) if destination_object else 0
delimiter = "/" if not recursive else None
# Fetch blobs list
source_blobs = list(source_bucket.list_blobs(prefix=source_object, delimiter=delimiter))
destination_blobs = list(
destination_bucket.list_blobs(prefix=destination_object, delimiter=delimiter)
)
# Create indexes that allow you to identify blobs based on their name
source_names_index = {a.name[source_object_prefix_len:]: a for a in source_blobs}
destination_names_index = {a.name[destination_object_prefix_len:]: a for a in destination_blobs}
# Create sets with names without parent object name
source_names = set(source_names_index.keys())
destination_names = set(destination_names_index.keys())
# Determine objects to copy and delete
to_copy = source_names - destination_names
to_delete = destination_names - source_names
to_copy_blobs = {source_names_index[a] for a in to_copy} # type: Set[storage.Blob]
to_delete_blobs = {destination_names_index[a] for a in to_delete} # type: Set[storage.Blob]
# Find names that are in both buckets
names_to_check = source_names.intersection(destination_names)
to_rewrite_blobs = set() # type: Set[storage.Blob]
# Compare objects based on crc32
for current_name in names_to_check:
source_blob = source_names_index[current_name]
destination_blob = destination_names_index[current_name]
# if the objects are different, save it
if source_blob.crc32c != destination_blob.crc32c:
to_rewrite_blobs.add(source_blob)
return to_copy_blobs, to_delete_blobs, to_rewrite_blobs
[docs]def gcs_object_is_directory(bucket: str) -> bool:
"""
Return True if given Google Cloud Storage URL (gs://<bucket>/<blob>)
is a directory or an empty bucket. Otherwise return False.
"""
_, blob = _parse_gcs_url(bucket)
return len(blob) == 0 or blob.endswith('/')
def _parse_gcs_url(gsurl: str) -> Tuple[str, str]:
"""
Given a Google Cloud Storage URL (gs://<bucket>/<blob>), returns a
tuple containing the corresponding bucket and blob.
"""
parsed_url = urlparse(gsurl)
if not parsed_url.netloc:
raise AirflowException('Please provide a bucket name')
if parsed_url.scheme.lower() != "gs":
raise AirflowException(f"Schema must be to 'gs://': Current schema: '{parsed_url.scheme}://'")
bucket = parsed_url.netloc
# Remove leading '/' but NOT trailing one
blob = parsed_url.path.lstrip('/')
return bucket, blob
