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"""Hook for Google Drive service."""
from __future__ import annotations
from typing import IO, Any, Sequence
from googleapiclient.discovery import Resource, build
from googleapiclient.errors import Error as GoogleApiClientError
from googleapiclient.http import HttpRequest, MediaFileUpload
from airflow.providers.google.common.hooks.base_google import GoogleBaseHook
[docs]class GoogleDriveHook(GoogleBaseHook):
"""
Hook for the Google Drive APIs.
:param api_version: API version used (for example v3).
:param gcp_conn_id: The connection ID to use when fetching connection info.
:param delegate_to: The account to impersonate using domain-wide delegation of authority,
if any. For this to work, the service account making the request must have
domain-wide delegation enabled.
:param impersonation_chain: Optional service account to impersonate using short-term
credentials, or chained list of accounts required to get the access_token
of the last account in the list, which will be impersonated in the request.
If set as a string, the account must grant the originating account
the Service Account Token Creator IAM role.
If set as a sequence, the identities from the list must grant
Service Account Token Creator IAM role to the directly preceding identity, with first
account from the list granting this role to the originating account.
"""
_conn: Resource | None = None
def __init__(
self,
api_version: str = "v3",
gcp_conn_id: str = "google_cloud_default",
delegate_to: str | None = None,
impersonation_chain: str | Sequence[str] | None = None,
) -> None:
super().__init__(
gcp_conn_id=gcp_conn_id,
delegate_to=delegate_to,
impersonation_chain=impersonation_chain,
)
self.api_version = api_version
[docs] def get_conn(self) -> Any:
"""
Retrieves the connection to Google Drive.
:return: Google Drive services object.
"""
if not self._conn:
http_authorized = self._authorize()
self._conn = build("drive", self.api_version, http=http_authorized, cache_discovery=False)
return self._conn
def _ensure_folders_exists(self, path: str, folder_id: str) -> str:
service = self.get_conn()
current_parent = folder_id
folders = path.split("/")
depth = 0
# First tries to enter directories
for current_folder in folders:
self.log.debug("Looking for %s directory with %s parent", current_folder, current_parent)
conditions = [
"trashed=false",
"mimeType='application/vnd.google-apps.folder'",
f"name='{current_folder}'",
f"'{current_parent}' in parents",
]
result = (
service.files()
.list(
q=" and ".join(conditions),
spaces="drive",
fields="files(id, name)",
includeItemsFromAllDrives=True,
supportsAllDrives=True,
)
.execute(num_retries=self.num_retries)
)
files = result.get("files", [])
if not files:
self.log.info("Not found %s directory", current_folder)
# If the directory does not exist, break loops
break
depth += 1
current_parent = files[0].get("id")
# Check if there are directories to process
if depth != len(folders):
# Create missing directories
for current_folder in folders[depth:]:
file_metadata = {
"name": current_folder,
"mimeType": "application/vnd.google-apps.folder",
"parents": [current_parent],
}
file = (
service.files()
.create(
body=file_metadata,
fields="id",
supportsAllDrives=True,
)
.execute(num_retries=self.num_retries)
)
self.log.info("Created %s directory", current_folder)
current_parent = file.get("id")
# Return the ID of the last directory
return current_parent
[docs] def exists(
self, folder_id: str, file_name: str, drive_id: str | None = None, *, include_trashed: bool = True
) -> bool:
"""
Checks to see if a file exists within a Google Drive folder.
:param folder_id: The id of the Google Drive folder in which the file resides
:param file_name: The name of a file in Google Drive
:param drive_id: Optional. The id of the shared Google Drive in which the file resides.
:param include_trashed: Whether to include objects in trash or not, default True as in Google API.
:return: True if the file exists, False otherwise
"""
return bool(
self.get_file_id(
folder_id=folder_id, file_name=file_name, include_trashed=include_trashed, drive_id=drive_id
)
)
def _get_file_info(self, file_id: str):
"""
Returns Google API file_info object containing id, name, parents in the response.
https://developers.google.com/drive/api/v3/reference/files/get
:param file_id: id as string representation of interested file
:return: file
"""
file_info = (
self.get_conn()
.files()
.get(
fileId=file_id,
fields="id,name,parents",
supportsAllDrives=True,
)
.execute(num_retries=2)
)
return file_info
def _resolve_file_path(self, file_id: str) -> str:
"""
Returns the full Google Drive path for given file_id.
:param file_id: The id of a file in Google Drive
:return: Google Drive full path for a file
"""
has_reached_root = False
current_file_id = file_id
path: str = ""
while not has_reached_root:
# current_file_id can be file or directory id, Google API treats them the same way.
file_info = self._get_file_info(current_file_id)
if current_file_id == file_id:
path = f'{file_info["name"]}'
else:
path = f'{file_info["name"]}/{path}'
# Google API returns parents array if there is at least one object inside
if "parents" in file_info and len(file_info["parents"]) == 1:
# https://developers.google.com/drive/api/guides/ref-single-parent
current_file_id = file_info["parents"][0]
else:
has_reached_root = True
return path
[docs] def get_file_id(
self, folder_id: str, file_name: str, drive_id: str | None = None, *, include_trashed: bool = True
) -> dict:
"""
Returns the file id of a Google Drive file.
:param folder_id: The id of the Google Drive folder in which the file resides
:param file_name: The name of a file in Google Drive
:param drive_id: Optional. The id of the shared Google Drive in which the file resides.
:param include_trashed: Whether to include objects in trash or not, default True as in Google API.
:return: Google Drive file id if the file exists, otherwise None
"""
query = f"name = '{file_name}'"
if folder_id:
query += f" and parents in '{folder_id}'"
if not include_trashed:
query += " and trashed=false"
service = self.get_conn()
if drive_id:
files = (
service.files()
.list(
q=query,
spaces="drive",
fields="files(id, mimeType)",
orderBy="modifiedTime desc",
driveId=drive_id,
includeItemsFromAllDrives=True,
supportsAllDrives=True,
corpora="drive",
)
.execute(num_retries=self.num_retries)
)
else:
files = (
service.files()
.list(q=query, spaces="drive", fields="files(id, mimeType)", orderBy="modifiedTime desc")
.execute(num_retries=self.num_retries)
)
file_metadata = {}
if files["files"]:
file_metadata = {"id": files["files"][0]["id"], "mime_type": files["files"][0]["mimeType"]}
return file_metadata
[docs] def upload_file(
self,
local_location: str,
remote_location: str,
chunk_size: int = 100 * 1024 * 1024,
resumable: bool = False,
folder_id: str = "root",
show_full_target_path: bool = True,
) -> str:
"""
Uploads a file that is available locally to a Google Drive service.
:param local_location: The path where the file is available.
:param remote_location: The path where the file will be send
:param chunk_size: File will be uploaded in chunks of this many bytes. Only
used if resumable=True. Pass in a value of -1 if the file is to be
uploaded as a single chunk. Note that Google App Engine has a 5MB limit
on request size, so you should never set your chunk size larger than 5MB,
or to -1.
:param resumable: True if this is a resumable upload. False means upload
in a single request.
:param folder_id: The base/root folder id for remote_location (part of the drive URL of a folder).
:param show_full_target_path: If true then it reveals full available file path in the logs.
:return: File ID
"""
service = self.get_conn()
directory_path, _, file_name = remote_location.rpartition("/")
if directory_path:
parent = self._ensure_folders_exists(path=directory_path, folder_id=folder_id)
else:
parent = folder_id
file_metadata = {"name": file_name, "parents": [parent]}
media = MediaFileUpload(local_location, chunksize=chunk_size, resumable=resumable)
file = (
service.files()
.create(body=file_metadata, media_body=media, fields="id", supportsAllDrives=True)
.execute(num_retries=self.num_retries)
)
file_id = file.get("id")
upload_location = remote_location
if folder_id != "root":
try:
upload_location = self._resolve_file_path(folder_id)
except GoogleApiClientError as e:
self.log.warning("A problem has been encountered when trying to resolve file path: ", e)
if show_full_target_path:
self.log.info("File %s uploaded to gdrive://%s.", local_location, upload_location)
else:
self.log.info("File %s has been uploaded successfully to gdrive", local_location)
return file_id
[docs] def download_file(self, file_id: str, file_handle: IO, chunk_size: int = 100 * 1024 * 1024):
"""
Download a file from Google Drive.
:param file_id: the id of the file
:param file_handle: file handle used to write the content to
:param chunk_size: File will be downloaded in chunks of this many bytes.
"""
request = self.get_media_request(file_id=file_id)
self.download_content_from_request(file_handle=file_handle, request=request, chunk_size=chunk_size)
