from datetime import datetime
import mimetypes
import os
from pathlib import Path, PurePosixPath
from typing import Any, Callable, Dict, Iterable, Optional, TYPE_CHECKING, Tuple, Union
from ..client import Client, register_client_class
from ..cloudpath import implementation_registry
from ..enums import FileCacheMode
from .gspath import GSPath
try:
if TYPE_CHECKING:
from google.auth.credentials import Credentials
from google.api_core.exceptions import NotFound
from google.auth.exceptions import DefaultCredentialsError
from google.cloud.storage import Client as StorageClient
except ModuleNotFoundError:
implementation_registry["gs"].dependencies_loaded = False
@register_client_class("gs")
class GSClient(Client):
"""Client class for Google Cloud Storage which handles authentication with GCP for
[`GSPath`](../gspath/) instances. See documentation for the
[`__init__` method][cloudpathlib.gs.gsclient.GSClient.__init__] for detailed authentication
options.
"""
def __init__(
self,
application_credentials: Optional[Union[str, os.PathLike]] = None,
credentials: Optional["Credentials"] = None,
project: Optional[str] = None,
storage_client: Optional["StorageClient"] = None,
file_cache_mode: Optional[Union[str, FileCacheMode]] = None,
local_cache_dir: Optional[Union[str, os.PathLike]] = None,
content_type_method: Optional[Callable] = mimetypes.guess_type,
):
"""Class constructor. Sets up a [`Storage
Client`](https://googleapis.dev/python/storage/latest/client.html).
Supports the following authentication methods of `Storage Client`.
- Environment variable `"GOOGLE_APPLICATION_CREDENTIALS"` containing a
path to a JSON credentials file for a Google service account. See
[Authenticating as a Service
Account](https://cloud.google.com/docs/authentication/production).
- File path to a JSON credentials file for a Google service account.
- OAuth2 Credentials object and a project name.
- Instantiated and already authenticated `Storage Client`.
If multiple methods are used, priority order is reverse of list above
(later in list takes priority). If no authentication methods are used,
then the client will be instantiated as anonymous, which will only have
access to public buckets.
Args:
application_credentials (Optional[Union[str, os.PathLike]]): Path to Google service
account credentials file.
credentials (Optional[Credentials]): The OAuth2 Credentials to use for this client.
See documentation for [`StorageClient`](
https://googleapis.dev/python/storage/latest/client.html).
project (Optional[str]): The project which the client acts on behalf of. See
documentation for [`StorageClient`](
https://googleapis.dev/python/storage/latest/client.html).
storage_client (Optional[StorageClient]): Instantiated [`StorageClient`](
https://googleapis.dev/python/storage/latest/client.html).
file_cache_mode (Optional[Union[str, FileCacheMode]]): How often to clear the file cache; see
[the caching docs](https://cloudpathlib.drivendata.org/stable/caching/) for more information
about the options in cloudpathlib.eums.FileCacheMode.
local_cache_dir (Optional[Union[str, os.PathLike]]): Path to directory to use as cache
for downloaded files. If None, will use a temporary directory. Default can be set with
the `CLOUDPATHLIB_LOCAL_CACHE_DIR` environment variable.
content_type_method (Optional[Callable]): Function to call to guess media type (mimetype) when
writing a file to the cloud. Defaults to `mimetypes.guess_type`. Must return a tuple (content type, content encoding).
"""
if application_credentials is None:
application_credentials = os.getenv("GOOGLE_APPLICATION_CREDENTIALS")
if storage_client is not None:
self.client = storage_client
elif credentials is not None:
self.client = StorageClient(credentials=credentials, project=project)
elif application_credentials is not None:
self.client = StorageClient.from_service_account_json(application_credentials)
else:
try:
self.client = StorageClient()
except DefaultCredentialsError:
self.client = StorageClient.create_anonymous_client()
super().__init__(
local_cache_dir=local_cache_dir,
content_type_method=content_type_method,
file_cache_mode=file_cache_mode,
)
def _get_metadata(self, cloud_path: GSPath) -> Optional[Dict[str, Any]]:
bucket = self.client.bucket(cloud_path.bucket)
blob = bucket.get_blob(cloud_path.blob)
if blob is None:
return None
else:
return {
"etag": blob.etag,
"size": blob.size,
"updated": blob.updated,
"content_type": blob.content_type,
}
def _download_file(self, cloud_path: GSPath, local_path: Union[str, os.PathLike]) -> Path:
bucket = self.client.bucket(cloud_path.bucket)
blob = bucket.get_blob(cloud_path.blob)
local_path = Path(local_path)
blob.download_to_filename(local_path)
return local_path
def _is_file_or_dir(self, cloud_path: GSPath) -> Optional[str]:
# short-circuit the root-level bucket
if not cloud_path.blob:
return "dir"
bucket = self.client.bucket(cloud_path.bucket)
blob = bucket.get_blob(cloud_path.blob)
if blob is not None:
return "file"
else:
prefix = cloud_path.blob
if prefix and not prefix.endswith("/"):
prefix += "/"
# not a file, see if it is a directory
f = bucket.list_blobs(max_results=1, prefix=prefix)
# at least one key with the prefix of the directory
if bool(list(f)):
return "dir"
else:
return None
def _exists(self, cloud_path: GSPath) -> bool:
# short-circuit the root-level bucket
if not cloud_path.blob:
try:
next(self.client.bucket(cloud_path.bucket).list_blobs())
return True
except NotFound:
return False
return self._is_file_or_dir(cloud_path) in ["file", "dir"]
def _list_dir(self, cloud_path: GSPath, recursive=False) -> Iterable[Tuple[GSPath, bool]]:
# shortcut if listing all available buckets
if not cloud_path.bucket:
if recursive:
raise NotImplementedError(
"Cannot recursively list all buckets and contents; you can get all the buckets then recursively list each separately."
)
yield from (
(self.CloudPath(f"gs://{str(b)}"), True) for b in self.client.list_buckets()
)
return
bucket = self.client.bucket(cloud_path.bucket)
prefix = cloud_path.blob
if prefix and not prefix.endswith("/"):
prefix += "/"
if recursive:
yielded_dirs = set()
for o in bucket.list_blobs(prefix=prefix):
# get directory from this path
for parent in PurePosixPath(o.name[len(prefix) :]).parents:
# if we haven't surfaced this directory already
if parent not in yielded_dirs and str(parent) != ".":
yield (
self.CloudPath(f"gs://{cloud_path.bucket}/{prefix}{parent}"),
True, # is a directory
)
yielded_dirs.add(parent)
yield (self.CloudPath(f"gs://{cloud_path.bucket}/{o.name}"), False) # is a file
else:
iterator = bucket.list_blobs(delimiter="/", prefix=prefix)
# files must be iterated first for `.prefixes` to be populated:
# see: https://github.com/googleapis/python-storage/issues/863
for file in iterator:
yield (
self.CloudPath(f"gs://{cloud_path.bucket}/{file.name}"),
False, # is a file
)
for directory in iterator.prefixes:
yield (
self.CloudPath(f"gs://{cloud_path.bucket}/{directory}"),
True, # is a directory
)
def _move_file(self, src: GSPath, dst: GSPath, remove_src: bool = True) -> GSPath:
# just a touch, so "REPLACE" metadata
if src == dst:
bucket = self.client.bucket(src.bucket)
blob = bucket.get_blob(src.blob)
# See https://github.com/googleapis/google-cloud-python/issues/1185#issuecomment-431537214
if blob.metadata is None:
blob.metadata = {"updated": datetime.utcnow()}
else:
blob.metadata["updated"] = datetime.utcnow()
blob.patch()
else:
src_bucket = self.client.bucket(src.bucket)
dst_bucket = self.client.bucket(dst.bucket)
src_blob = src_bucket.get_blob(src.blob)
src_bucket.copy_blob(src_blob, dst_bucket, dst.blob)
if remove_src:
src_blob.delete()
return dst
def _remove(self, cloud_path: GSPath, missing_ok: bool = True) -> None:
file_or_dir = self._is_file_or_dir(cloud_path)
if file_or_dir == "dir":
blobs = [
b.blob for b, is_dir in self._list_dir(cloud_path, recursive=True) if not is_dir
]
bucket = self.client.bucket(cloud_path.bucket)
for blob in blobs:
bucket.get_blob(blob).delete()
elif file_or_dir == "file":
bucket = self.client.bucket(cloud_path.bucket)
bucket.get_blob(cloud_path.blob).delete()
else:
# Does not exist
if not missing_ok:
raise FileNotFoundError(f"File does not exist: {cloud_path}")
def _upload_file(self, local_path: Union[str, os.PathLike], cloud_path: GSPath) -> GSPath:
bucket = self.client.bucket(cloud_path.bucket)
blob = bucket.blob(cloud_path.blob)
extra_args = {}
if self.content_type_method is not None:
content_type, _ = self.content_type_method(str(local_path))
extra_args["content_type"] = content_type
blob.upload_from_filename(str(local_path), **extra_args)
return cloud_path
GSClient.GSPath = GSClient.CloudPath # type: ignore