# -*- coding: utf-8 -*-
"""
Google Cloud Storage pythonic interface
"""
import asyncio
import fsspec
import io
import json
import logging
import os
import posixpath
import re
import warnings
import weakref
from fsspec.asyn import sync_wrapper, sync, AsyncFileSystem
from fsspec.utils import stringify_path, setup_logging
from fsspec.callbacks import NoOpCallback
from fsspec.implementations.http import get_client
from .retry import retry_request, validate_response
from .checkers import get_consistency_checker
from .credentials import GoogleCredentials
from . import __version__ as version
logger = logging.getLogger("gcsfs")
if "GCSFS_DEBUG" in os.environ:
setup_logging(logger=logger, level=os.environ["GCSFS_DEBUG"])
# client created 2018-01-16
ACLs = {
"authenticatedread",
"bucketownerfullcontrol",
"bucketownerread",
"private",
"projectprivate",
"publicread",
}
bACLs = {
"authenticatedRead",
"private",
"projectPrivate",
"publicRead",
"publicReadWrite",
}
DEFAULT_PROJECT = os.environ.get("GCSFS_DEFAULT_PROJECT", "")
GCS_MIN_BLOCK_SIZE = 2 ** 18
GCS_MAX_BLOCK_SIZE = 2 ** 28
DEFAULT_BLOCK_SIZE = 5 * 2 ** 20
QUOTE_TABLE = str.maketrans(
{
"%": "%25",
"/": "%2F",
" ": "%20",
}
)
def quote_plus(s):
"""
Convert some URL elements to be HTTP-safe.
Not the same as in urllib, because, for instance, parentheses and commas
are passed through.
Parameters
----------
s: input URL/portion
Returns
-------
corrected URL
"""
return s.translate(QUOTE_TABLE)
def norm_path(path):
"""
Canonicalize path to '{bucket}/{name}' form.
Used by petastorm, do not remove.
"""
return "/".join(GCSFileSystem.split_path(path))
async def _req_to_text(r):
async with r:
return (await r.read()).decode()
[docs]class GCSFileSystem(AsyncFileSystem):
r"""
Connect to Google Cloud Storage.
The following modes of authentication are supported:
- ``token=None``, GCSFS will attempt to guess your credentials in the
following order: gcloud CLI default, gcsfs cached token, google compute
metadata service, anonymous.
- ``token='google_default'``, your default gcloud credentials will be used,
which are typically established by doing ``gcloud login`` in a terminal.
- ``token=='cache'``, credentials from previously successful gcsfs
authentication will be used (use this after "browser" auth succeeded)
- ``token='anon'``, no authentication is performed, and you can only
access data which is accessible to allUsers (in this case, the project and
access level parameters are meaningless)
- ``token='browser'``, you get an access code with which you can
authenticate via a specially provided URL
- if ``token='cloud'``, we assume we are running within google compute
or google container engine, and query the internal metadata directly for
a token.
- you may supply a token generated by the
[gcloud](https://cloud.google.com/sdk/docs/)
utility; this is either a python dictionary, the name of a file
containing the JSON returned by logging in with the gcloud CLI tool,
or a Credentials object. gcloud typically stores its tokens in locations
such as
``~/.config/gcloud/application_default_credentials.json``,
`` ~/.config/gcloud/credentials``, or
``~\AppData\Roaming\gcloud\credentials``, etc.
Specific methods, (eg. `ls`, `info`, ...) may return object details from GCS.
These detailed listings include the
[object resource](https://cloud.google.com/storage/docs/json_api/v1/objects#resource)
GCS *does not* include "directory" objects but instead generates
directories by splitting
[object names](https://cloud.google.com/storage/docs/key-terms).
This means that, for example,
a directory does not need to exist for an object to be created within it.
Creating an object implicitly creates it's parent directories, and removing
all objects from a directory implicitly deletes the empty directory.
`GCSFileSystem` generates listing entries for these implied directories in
listing apis with the object properties:
- "name" : string
The "{bucket}/{name}" path of the dir, used in calls to
GCSFileSystem or GCSFile.
- "bucket" : string
The name of the bucket containing this object.
- "kind" : 'storage#object'
- "size" : 0
- "storageClass" : 'DIRECTORY'
- type: 'directory' (fsspec compat)
GCSFileSystem maintains a per-implied-directory cache of object listings and
fulfills all object information and listing requests from cache. This implied, for example, that objects
created via other processes *will not* be visible to the GCSFileSystem until the cache
refreshed. Calls to GCSFileSystem.open and calls to GCSFile are not effected by this cache.
In the default case the cache is never expired. This may be controlled via the `cache_timeout`
GCSFileSystem parameter or via explicit calls to `GCSFileSystem.invalidate_cache`.
Parameters
----------
project : string
project_id to work under. Note that this is not the same as, but often
very similar to, the project name.
This is required in order
to list all the buckets you have access to within a project and to
create/delete buckets, or update their access policies.
If ``token='google_default'``, the value is overridden by the default,
if ``token='anon'``, the value is ignored.
access : one of {'read_only', 'read_write', 'full_control'}
Full control implies read/write as well as modifying metadata,
e.g., access control.
token: None, dict or string
(see description of authentication methods, above)
consistency: 'none', 'size', 'md5'
Check method when writing files. Can be overridden in open().
cache_timeout: float, seconds
Cache expiration time in seconds for object metadata cache.
Set cache_timeout <= 0 for no caching, None for no cache expiration.
secure_serialize: bool (deprecated)
check_connection: bool
When token=None, gcsfs will attempt various methods of establishing
credentials, falling back to anon. It is possible for a method to
find credentials in the system that turn out not to be valid. Setting
this parameter to True will ensure that an actual operation is
attempted before deciding that credentials are valid.
requester_pays : bool, or str default False
Whether to use requester-pays requests. This will include your
project ID `project` in requests as the `userPorject`, and you'll be
billed for accessing data from requester-pays buckets. Optionally,
pass a project-id here as a string to use that as the `userProject`.
session_kwargs: dict
passed on to aiohttp.ClientSession; can contain, for example,
proxy settings.
"""
scopes = {"read_only", "read_write", "full_control"}
retries = 6 # number of retries on http failure
base = "https://storage.googleapis.com/storage/v1/"
default_block_size = DEFAULT_BLOCK_SIZE
protocol = "gcs", "gs"
async_impl = True
def __init__(
self,
project=DEFAULT_PROJECT,
access="full_control",
token=None,
block_size=None,
consistency="none",
cache_timeout=None,
secure_serialize=True,
check_connection=False,
requests_timeout=None,
requester_pays=False,
asynchronous=False,
session_kwargs=None,
loop=None,
timeout=None,
**kwargs,
):
super().__init__(
self,
listings_expiry_time=cache_timeout,
asynchronous=asynchronous,
loop=loop,
**kwargs,
)
if access not in self.scopes:
raise ValueError("access must be one of {}", self.scopes)
if project is None:
warnings.warn("GCS project not set - cannot list or create buckets")
if block_size is not None:
self.default_block_size = block_size
self.requester_pays = requester_pays
self.consistency = consistency
self.cache_timeout = cache_timeout or kwargs.pop("listings_expiry_time", None)
self.requests_timeout = requests_timeout
self.timeout = timeout
self._session = None
self.session_kwargs = session_kwargs or {}
self.credentials = GoogleCredentials(project, access, token, check_connection)
if not self.asynchronous:
self._session = sync(
self.loop, get_client, timeout=self.timeout, **self.session_kwargs
)
weakref.finalize(self, self.close_session, self.loop, self._session)
@property
def project(self):
return self.credentials.project
@staticmethod
def close_session(loop, session):
if loop is not None and session is not None:
if loop.is_running():
try:
sync(loop, session.close, timeout=0.1)
except fsspec.FSTimeoutError:
pass
else:
pass
async def _set_session(self):
if self._session is None:
self._session = await get_client(**self.session_kwargs)
return self._session
@property
def session(self):
if self.asynchronous and self._session is None:
raise RuntimeError("Please await _connect* before anything else")
return self._session
@classmethod
def _strip_protocol(cls, path):
if isinstance(path, list):
return [cls._strip_protocol(p) for p in path]
path = stringify_path(path)
protos = (cls.protocol,) if isinstance(cls.protocol, str) else cls.protocol
for protocol in protos:
if path.startswith(protocol + "://"):
path = path[len(protocol) + 3 :]
elif path.startswith(protocol + "::"):
path = path[len(protocol) + 2 :]
# use of root_marker to make minimum required path, e.g., "/"
return path or cls.root_marker
def _get_params(self, kwargs):
params = {k: v for k, v in kwargs.items() if v is not None}
# needed for requester pays buckets
if self.requester_pays:
if isinstance(self.requester_pays, str):
user_project = self.requester_pays
else:
user_project = self.project
params["userProject"] = user_project
return params
def _get_headers(self, headers):
out = {}
if headers is not None:
out.update(headers)
if "User-Agent" not in out:
out["User-Agent"] = "python-gcsfs/" + version
self.credentials.apply(out)
return out
def _format_path(self, path, args):
if not path.startswith("http"):
path = self.base + path
if args:
path = path.format(*[quote_plus(p) for p in args])
return path
@retry_request(retries=retries)
async def _request(
self, method, path, *args, headers=None, json=None, data=None, **kwargs
):
await self._set_session()
async with self.session.request(
method=method,
url=self._format_path(path, args),
params=self._get_params(kwargs),
json=json,
headers=self._get_headers(headers),
data=data,
timeout=self.requests_timeout,
) as r:
status = r.status
headers = r.headers
info = r.request_info # for debug only
contents = await r.read()
validate_response(status, contents, path, args)
return status, headers, info, contents
async def _call(
self, method, path, *args, json_out=False, info_out=False, **kwargs
):
logger.debug(f"{method.upper()}: {path}, {args}, {kwargs.get('headers')}")
status, headers, info, contents = await self._request(
method, path, *args, **kwargs
)
if json_out:
return json.loads(contents)
elif info_out:
return info
else:
return headers, contents
call = sync_wrapper(_call)
@property
def buckets(self):
"""Return list of available project buckets."""
return [
b["name"] for b in sync(self.loop, self._list_buckets, timeout=self.timeout)
]
@staticmethod
def _process_object(bucket, object_metadata):
"""Process object resource into gcsfs object information format.
Process GCS object resource via type casting and attribute updates to
the cache-able gcsfs object information format. Returns an updated copy
of the object resource.
(See https://cloud.google.com/storage/docs/json_api/v1/objects#resource)
"""
result = dict(object_metadata)
result["size"] = int(object_metadata.get("size", 0))
result["name"] = posixpath.join(bucket, object_metadata["name"])
result["type"] = "file"
return result
async def _get_object(self, path):
"""Return object information at the given path."""
bucket, key = self.split_path(path)
# Check if parent dir is in listing cache
listing = self._ls_from_cache(path)
if listing:
for file_details in listing:
if file_details["type"] == "file" and file_details["name"] == path:
return file_details
else:
raise FileNotFoundError(path)
if not key:
# Attempt to "get" the bucket root, return error instead of
# listing.
raise FileNotFoundError(path)
res = None
# Work around various permission settings. Prefer an object get (storage.objects.get), but
# fall back to a bucket list + filter to object name (storage.objects.list).
try:
res = await self._call("GET", "b/{}/o/{}", bucket, key, json_out=True)
except OSError as e:
if not str(e).startswith("Forbidden"):
raise
resp = await self._call(
"GET", "b/{}/o/", bucket, json_out=True, prefix=key, maxResults=1
)
for item in resp.get("items", []):
if item["name"] == key:
res = item
break
if res is None:
raise FileNotFoundError(path)
return self._process_object(bucket, res)
async def _list_objects(self, path, prefix=""):
bucket, key = self.split_path(path)
path = path.rstrip("/")
try:
clisting = self._ls_from_cache(path)
hassubdirs = clisting and any(
c["name"].rstrip("/") == path and c["type"] == "directory"
for c in clisting
)
if clisting and not hassubdirs:
return clisting
except FileNotFoundError:
# not finding a bucket in list of "my" buckets is OK
if key:
raise
items, prefixes = await self._do_list_objects(path, prefix=prefix)
pseudodirs = [
{
"bucket": bucket,
"name": bucket + "/" + prefix.strip("/"),
"size": 0,
"storageClass": "DIRECTORY",
"type": "directory",
}
for prefix in prefixes
]
if not (items + pseudodirs):
if key:
return [await self._get_object(path)]
else:
return []
out = items + pseudodirs
# Don't cache prefixed/partial listings
if not prefix:
self.dircache[path] = out
return out
async def _do_list_objects(self, path, max_results=None, delimiter="/", prefix=""):
"""Object listing for the given {bucket}/{prefix}/ path."""
bucket, _path = self.split_path(path)
_path = "" if not _path else _path.rstrip("/") + "/"
prefix = f"{_path}{prefix}" or None
prefixes = []
items = []
page = await self._call(
"GET",
"b/{}/o/",
bucket,
delimiter=delimiter,
prefix=prefix,
maxResults=max_results,
json_out=True,
)
prefixes.extend(page.get("prefixes", []))
items.extend(page.get("items", []))
next_page_token = page.get("nextPageToken", None)
while next_page_token is not None:
page = await self._call(
"GET",
"b/{}/o/",
bucket,
delimiter=delimiter,
prefix=prefix,
maxResults=max_results,
pageToken=next_page_token,
json_out=True,
)
assert page["kind"] == "storage#objects"
prefixes.extend(page.get("prefixes", []))
items.extend(page.get("items", []))
next_page_token = page.get("nextPageToken", None)
items = [self._process_object(bucket, i) for i in items]
return items, prefixes
async def _list_buckets(self):
"""Return list of all buckets under the current project."""
if "" not in self.dircache:
items = []
page = await self._call("GET", "b/", project=self.project, json_out=True)
assert page["kind"] == "storage#buckets"
items.extend(page.get("items", []))
next_page_token = page.get("nextPageToken", None)
while next_page_token is not None:
page = await self._call(
"GET",
"b/",
project=self.project,
pageToken=next_page_token,
json_out=True,
)
assert page["kind"] == "storage#buckets"
items.extend(page.get("items", []))
next_page_token = page.get("nextPageToken", None)
self.dircache[""] = [
{"name": i["name"] + "/", "size": 0, "type": "directory"} for i in items
]
return self.dircache[""]
[docs] def invalidate_cache(self, path=None):
"""
Invalidate listing cache for given path, it is reloaded on next use.
Parameters
----------
path: string or None
If None, clear all listings cached else listings at or under given
path.
"""
if path is None:
logger.debug("invalidate_cache clearing cache")
self.dircache.clear()
else:
path = self._strip_protocol(path).rstrip("/")
while path:
self.dircache.pop(path, None)
path = self._parent(path)
async def _mkdir(
self, bucket, acl="projectPrivate", default_acl="bucketOwnerFullControl"
):
"""
New bucket
Parameters
----------
bucket: str
bucket name. If contains '/' (i.e., looks like subdir), will
have no effect because GCS doesn't have real directories.
acl: string, one of bACLs
access for the bucket itself
default_acl: str, one of ACLs
default ACL for objects created in this bucket
"""
if bucket in ["", "/"]:
raise ValueError("Cannot create root bucket")
if "/" in bucket:
return
await self._call(
method="POST",
path="b/",
predefinedAcl=acl,
project=self.project,
predefinedDefaultObjectAcl=default_acl,
json={"name": bucket},
json_out=True,
)
self.invalidate_cache(bucket)
mkdir = sync_wrapper(_mkdir)
async def _rmdir(self, bucket):
"""Delete an empty bucket
Parameters
----------
bucket: str
bucket name. If contains '/' (i.e., looks like subdir), will
have no effect because GCS doesn't have real directories.
"""
bucket = bucket.rstrip("/")
if "/" in bucket:
return
await self._call("DELETE", "b/" + bucket, json_out=False)
self.invalidate_cache(bucket)
self.invalidate_cache("")
rmdir = sync_wrapper(_rmdir)
async def _info(self, path, **kwargs):
"""File information about this path."""
path = self._strip_protocol(path).rstrip("/")
# Check directory cache for parent dir
parent_path = self._parent(path)
parent_cache = self._ls_from_cache(parent_path)
bucket, key = self.split_path(path)
if parent_cache:
for o in parent_cache:
if o["name"].rstrip("/") == path:
return o
if self._ls_from_cache(path):
# this is a directory
return {
"bucket": bucket,
"name": path.rstrip("/"),
"size": 0,
"storageClass": "DIRECTORY",
"type": "directory",
}
# Check exact file path
try:
return await self._get_object(path)
except FileNotFoundError:
pass
kwargs["detail"] = True # Force to true for info
out = await self._ls(path, **kwargs)
out0 = [o for o in out if o["name"].rstrip("/") == path]
if out0:
# exact hit
return out0[0]
elif out:
# other stuff - must be a directory
return {
"bucket": bucket,
"name": path.rstrip("/"),
"size": 0,
"storageClass": "DIRECTORY",
"type": "directory",
}
else:
raise FileNotFoundError(path)
async def _glob(self, path, prefix="", **kwargs):
if not prefix:
# Identify pattern prefixes. Ripped from fsspec.spec.AbstractFileSystem.glob and matches
# the glob.has_magic patterns.
indstar = path.find("*") if path.find("*") >= 0 else len(path)
indques = path.find("?") if path.find("?") >= 0 else len(path)
indbrace = path.find("[") if path.find("[") >= 0 else len(path)
ind = min(indstar, indques, indbrace)
prefix = path[:ind].split("/")[-1]
return await super()._glob(path, prefix=prefix, **kwargs)
async def _ls(self, path, detail=False, prefix="", **kwargs):
"""List objects under the given '/{bucket}/{prefix} path."""
path = self._strip_protocol(path).rstrip("/")
if path in ["/", ""]:
out = await self._list_buckets()
else:
out = await self._list_objects(path, prefix=prefix)
if detail:
return out
else:
return sorted([o["name"] for o in out])
[docs] @classmethod
def url(cls, path):
""" Get HTTP URL of the given path """
u = "https://storage.googleapis.com/download/storage/v1/b/{}/o/{}?alt=media"
bucket, object = cls.split_path(path)
object = quote_plus(object)
return u.format(bucket, object)
async def _cat_file(self, path, start=None, end=None):
""" Simple one-shot get of file data """
u2 = self.url(path)
if start or end:
head = {"Range": await self._process_limits(path, start, end)}
else:
head = {}
headers, out = await self._call("GET", u2, headers=head)
return out
async def _getxattr(self, path, attr):
"""Get user-defined metadata attribute"""
meta = (await self._info(path)).get("metadata", {})
return meta[attr]
getxattr = sync_wrapper(_getxattr)
async def _setxattrs(
self, path, content_type=None, content_encoding=None, **kwargs
):
"""Set/delete/add writable metadata attributes
Parameters
---------
content_type: str
If not None, set the content-type to this value
content_encoding: str
If not None, set the content-encoding.
See https://cloud.google.com/storage/docs/transcoding
kw_args: key-value pairs like field="value" or field=None
value must be string to add or modify, or None to delete
Returns
-------
Entire metadata after update (even if only path is passed)
"""
i_json = {"metadata": kwargs}
if content_type is not None:
i_json["contentType"] = content_type
if content_encoding is not None:
i_json["contentEncoding"] = content_encoding
bucket, key = self.split_path(path)
o_json = await self._call(
"PATCH",
"b/{}/o/{}",
bucket,
key,
fields="metadata",
json=i_json,
json_out=True,
)
(await self._info(path))["metadata"] = o_json.get("metadata", {})
return o_json.get("metadata", {})
setxattrs = sync_wrapper(_setxattrs)
async def _merge(self, path, paths, acl=None):
"""Concatenate objects within a single bucket"""
bucket, key = self.split_path(path)
source = [{"name": self.split_path(p)[1]} for p in paths]
await self._call(
"POST",
"b/{}/o/{}/compose",
bucket,
key,
destinationPredefinedAcl=acl,
headers={"Content-Type": "application/json"},
json={
"sourceObjects": source,
"kind": "storage#composeRequest",
"destination": {"name": key, "bucket": bucket},
},
)
merge = sync_wrapper(_merge)
async def _cp_file(self, path1, path2, acl=None, **kwargs):
"""Duplicate remote file"""
b1, k1 = self.split_path(path1)
b2, k2 = self.split_path(path2)
out = await self._call(
"POST",
"b/{}/o/{}/rewriteTo/b/{}/o/{}",
b1,
k1,
b2,
k2,
headers={"Content-Type": "application/json"},
destinationPredefinedAcl=acl,
json_out=True,
)
while out["done"] is not True:
out = await self._call(
"POST",
"b/{}/o/{}/rewriteTo/b/{}/o/{}",
b1,
k1,
b2,
k2,
headers={"Content-Type": "application/json"},
rewriteToken=out["rewriteToken"],
destinationPredefinedAcl=acl,
json_out=True,
)
async def _rm_file(self, path):
bucket, key = self.split_path(path)
if key:
await self._call("DELETE", "b/{}/o/{}", bucket, key)
self.invalidate_cache(posixpath.dirname(self._strip_protocol(path)))
return True
else:
await self._rmdir(path)
async def _rm_files(self, paths):
template = (
"\n--===============7330845974216740156==\n"
"Content-Type: application/http\n"
"Content-Transfer-Encoding: binary\n"
"Content-ID: <b29c5de2-0db4-490b-b421-6a51b598bd11+{i}>"
"\n\nDELETE /storage/v1/b/{bucket}/o/{key} HTTP/1.1\n"
"Content-Type: application/json\n"
"accept: application/json\ncontent-length: 0\n"
)
body = "".join(
[
template.format(
i=i + 1,
bucket=p.split("/", 1)[0],
key=quote_plus(p.split("/", 1)[1]),
)
for i, p in enumerate(paths)
]
)
headers, content = await self._call(
"POST",
"https://storage.googleapis.com/batch/storage/v1",
headers={
"Content-Type": 'multipart/mixed; boundary="=========='
'=====7330845974216740156=="'
},
data=body + "\n--===============7330845974216740156==--",
)
boundary = headers["Content-Type"].split("=", 1)[1]
parents = [self._parent(p) for p in paths]
[self.invalidate_cache(parent) for parent in parents + list(paths)]
txt = content.decode()
if any(
not ("200 OK" in c or "204 No Content" in c)
for c in txt.split(boundary)[1:-1]
):
pattern = '"message": "([^"]+)"'
out = set(re.findall(pattern, txt))
raise OSError(out)
async def _rm(self, path, recursive=False, maxdepth=None, batchsize=20):
paths = await self._expand_path(path, recursive=recursive, maxdepth=maxdepth)
files = [p for p in paths if self.split_path(p)[1]]
dirs = [p for p in paths if not self.split_path(p)[1]]
exs = await asyncio.gather(
*(
[
self._rm_files(files[i : i + batchsize])
for i in range(0, len(files), batchsize)
]
),
return_exceptions=True,
)
exs = [ex for ex in exs if ex is not None and "No such object" not in str(ex)]
if exs:
raise exs[0]
await asyncio.gather(*[self._rmdir(d) for d in dirs])
rm = sync_wrapper(_rm)
async def _pipe_file(
self,
path,
data,
metadata=None,
consistency=None,
content_type="application/octet-stream",
chunksize=50 * 2 ** 20,
):
# enforce blocksize should be a multiple of 2**18
consistency = consistency or self.consistency
bucket, key = self.split_path(path)
size = len(data)
out = None
if size < 5 * 2 ** 20:
return await simple_upload(
self, bucket, key, data, metadata, consistency, content_type
)
else:
location = await initiate_upload(self, bucket, key, content_type, metadata)
for offset in range(0, len(data), chunksize):
bit = data[offset : offset + chunksize]
out = await upload_chunk(
self, location, bit, offset, size, content_type
)
checker = get_consistency_checker(consistency)
checker.update(data)
checker.validate_json_response(out)
self.invalidate_cache(self._parent(path))
async def _put_file(
self,
lpath,
rpath,
metadata=None,
consistency=None,
content_type="application/octet-stream",
chunksize=50 * 2 ** 20,
callback=None,
**kwargs,
):
# enforce blocksize should be a multiple of 2**18
if os.path.isdir(lpath):
return
callback = callback or NoOpCallback()
consistency = consistency or self.consistency
checker = get_consistency_checker(consistency)
bucket, key = self.split_path(rpath)
with open(lpath, "rb") as f0:
size = f0.seek(0, 2)
f0.seek(0)
callback.set_size(size)
if size < 5 * 2 ** 20:
await simple_upload(
self,
bucket,
key,
f0.read(),
consistency=consistency,
metadatain=metadata,
content_type=content_type,
)
callback.absolute_update(size)
return None
else:
location = await initiate_upload(
self, bucket, key, content_type, metadata
)
offset = 0
while True:
bit = f0.read(chunksize)
if not bit:
break
out = await upload_chunk(
self, location, bit, offset, size, content_type
)
offset += len(bit)
callback.absolute_update(offset)
checker.update(bit)
checker.validate_json_response(out)
self.invalidate_cache(self._parent(rpath))
async def _isdir(self, path):
try:
return (await self._info(path))["type"] == "directory"
except IOError:
return False
async def _find(self, path, withdirs=False, detail=False, prefix="", **kwargs):
path = self._strip_protocol(path)
bucket, key = self.split_path(path)
out, _ = await self._do_list_objects(
path,
delimiter=None,
prefix=prefix,
)
if not prefix and not out and key:
try:
out = [
await self._get_object(
path,
)
]
except FileNotFoundError:
out = []
dirs = []
sdirs = set()
cache_entries = {}
for o in out:
par = o["name"]
while par:
par = self._parent(par)
if par not in sdirs:
if len(par) < len(path):
break
sdirs.add(par)
dirs.append(
{
"Key": self.split_path(par)[1],
"Size": 0,
"name": par,
"StorageClass": "DIRECTORY",
"type": "directory",
"size": 0,
}
)
# Don't cache "folder-like" objects (ex: "Create Folder" in GCS console) to prevent
# masking subfiles in subsequent requests.
if not o["name"].endswith("/"):
cache_entries.setdefault(par, []).append(o)
self.dircache.update(cache_entries)
if withdirs:
out = sorted(out + dirs, key=lambda x: x["name"])
if detail:
return {o["name"]: o for o in out}
return [o["name"] for o in out]
@retry_request(retries=retries)
async def _get_file_request(
self, rpath, lpath, *args, headers=None, callback=None, **kwargs
):
consistency = kwargs.pop("consistency", self.consistency)
async with self.session.get(
url=rpath,
params=self._get_params(kwargs),
headers=self._get_headers(headers),
timeout=self.requests_timeout,
) as r:
r.raise_for_status()
try:
size = int(r.headers["content-length"])
except (KeyError, ValueError):
size = None
callback.set_size(size)
checker = get_consistency_checker(consistency)
os.makedirs(os.path.dirname(lpath), exist_ok=True)
with open(lpath, "wb") as f2:
while True:
data = await r.content.read(4096 * 32)
if not data:
break
f2.write(data)
checker.update(data)
callback.relative_update(len(data))
validate_response(r.status, data, rpath) # validate http request
checker.validate_http_response(r) # validate file consistency
return r.status, r.headers, r.request_info, data
async def _get_file(self, rpath, lpath, callback=None, **kwargs):
u2 = self.url(rpath)
callback = callback or NoOpCallback()
await self._get_file_request(u2, lpath, callback=callback, **kwargs)
def _open(
self,
path,
mode="rb",
block_size=None,
cache_options=None,
acl=None,
consistency=None,
metadata=None,
autocommit=True,
**kwargs,
):
"""
See ``GCSFile``.
consistency: None or str
If None, use default for this instance
"""
if block_size is None:
block_size = self.default_block_size
const = consistency or self.consistency
return GCSFile(
self,
path,
mode,
block_size,
cache_options=cache_options,
consistency=const,
metadata=metadata,
acl=acl,
autocommit=autocommit,
**kwargs,
)
[docs] @classmethod
def split_path(cls, path):
"""
Normalise GCS path string into bucket and key.
Parameters
----------
path : string
Input path, like `gcs://mybucket/path/to/file`.
Path is of the form: '[gs|gcs://]bucket[/key]'
Returns
-------
(bucket, key) tuple
"""
path = cls._strip_protocol(path).lstrip("/")
if "/" not in path:
return path, ""
else:
return path.split("/", 1)
[docs] def sign(self, path, expiration=100, **kwargs):
"""Create a signed URL representing the given path.
Parameters
----------
path : str
The path on the filesystem
expiration : int
Number of seconds to enable the URL for
Returns
-------
URL : str
The signed URL
"""
from google.cloud import storage
bucket, key = self.split_path(path)
client = storage.Client(
credentials=self.credentials.credentials, project=self.project
)
bucket = client.bucket(bucket)
blob = bucket.blob(key)
return blob.generate_signed_url(expiration=expiration)
GoogleCredentials.load_tokens()
[docs]class GCSFile(fsspec.spec.AbstractBufferedFile):
def __init__(
self,
gcsfs,
path,
mode="rb",
block_size=DEFAULT_BLOCK_SIZE,
autocommit=True,
cache_type="readahead",
cache_options=None,
acl=None,
consistency="md5",
metadata=None,
content_type=None,
timeout=None,
**kwargs,
):
"""
Open a file.
Parameters
----------
gcsfs: instance of GCSFileSystem
path: str
location in GCS, like 'bucket/path/to/file'
mode: str
Normal file modes. Currently only 'wb' amd 'rb'.
block_size: int
Buffer size for reading or writing
acl: str
ACL to apply, if any, one of ``ACLs``. New files are normally
"bucketownerfullcontrol", but a default can be configured per
bucket.
consistency: str, 'none', 'size', 'md5', 'crc32c'
Check for success in writing, applied at file close.
'size' ensures that the number of bytes reported by GCS matches
the number we wrote; 'md5' does a full checksum. Any value other
than 'size' or 'md5' or 'crc32c' is assumed to mean no checking.
content_type: str
default is `application/octet-stream`. See the list of available
content types at https://www.iana.org/assignments/media-types/media-types.txt
metadata: dict
Custom metadata, in key/value pairs, added at file creation
timeout: int
Timeout seconds for the asynchronous callback.
"""
super().__init__(
gcsfs,
path,
mode,
block_size,
autocommit=autocommit,
cache_type=cache_type,
cache_options=cache_options,
**kwargs,
)
bucket, key = self.fs.split_path(path)
if not key:
raise OSError("Attempt to open a bucket")
self.gcsfs = gcsfs
self.bucket = bucket
self.key = key
self.acl = acl
self.checker = get_consistency_checker(consistency)
if "r" in self.mode:
det = self.details
else:
det = {}
self.content_type = content_type or det.get(
"contentType", "application/octet-stream"
)
self.metadata = metadata or det.get("metadata", {})
self.timeout = timeout
if mode == "wb":
if self.blocksize < GCS_MIN_BLOCK_SIZE:
warnings.warn("Setting block size to minimum value, 2**18")
self.blocksize = GCS_MIN_BLOCK_SIZE
self.location = None
[docs] def info(self):
""" File information about this path """
return self.details
[docs] def url(self):
""" HTTP link to this file's data """
return self.details["mediaLink"]
def _upload_chunk(self, final=False):
"""Write one part of a multi-block file upload
Parameters
----------
final: bool
Complete and commit upload
"""
while True:
# shortfall splits blocks bigger than max allowed upload
data = self.buffer.getvalue()
head = {}
l = len(data)
if (l < GCS_MIN_BLOCK_SIZE) and not final:
# either flush() was called, but we don't have enough to
# push, or we split a big upload, and have less left than one
# block. If this is the final part, OK to violate those
# terms.
return False
# Select the biggest possible chunk of data to be uploaded
chunk_length = min(l, GCS_MAX_BLOCK_SIZE)
chunk = data[:chunk_length]
if final and self.autocommit and chunk_length == l:
if l:
# last chunk
head["Content-Range"] = "bytes %i-%i/%i" % (
self.offset,
self.offset + chunk_length - 1,
self.offset + l,
)
else:
# closing when buffer is empty
head["Content-Range"] = "bytes */%i" % self.offset
data = None
else:
head["Content-Range"] = "bytes %i-%i/*" % (
self.offset,
self.offset + chunk_length - 1,
)
head.update(
{"Content-Type": self.content_type, "Content-Length": str(chunk_length)}
)
headers, contents = self.gcsfs.call(
"POST", self.location, headers=head, data=chunk
)
if "Range" in headers:
end = int(headers["Range"].split("-")[1])
shortfall = (self.offset + l - 1) - end
if shortfall:
self.checker.update(data[:-shortfall])
self.buffer = io.BytesIO(data[-shortfall:])
self.buffer.seek(shortfall)
self.offset += l - shortfall
continue
else:
self.checker.update(data)
else:
assert final, "Response looks like upload is over"
if l:
j = json.loads(contents)
self.checker.update(data)
self.checker.validate_json_response(j)
# Clear buffer and update offset when all is received
self.buffer = io.BytesIO()
self.offset += l
break
return True
[docs] def commit(self):
"""If not auto-committing, finalize file"""
self.autocommit = True
self._upload_chunk(final=True)
def _initiate_upload(self):
""" Create multi-upload """
self.location = sync(
self.gcsfs.loop,
initiate_upload,
self.gcsfs,
self.bucket,
self.key,
self.content_type,
self.metadata,
timeout=self.timeout,
)
[docs] def discard(self):
"""Cancel in-progress multi-upload
Should only happen during discarding this write-mode file
"""
if self.location is None:
return
uid = re.findall("upload_id=([^&=?]+)", self.location)
self.gcsfs.call(
"DELETE",
"https://storage.googleapis.com/upload/storage/v1/b/%s/o"
"" % quote_plus(self.bucket),
params={"uploadType": "resumable", "upload_id": uid},
json_out=True,
)
def _simple_upload(self):
"""One-shot upload, less than 5MB"""
self.buffer.seek(0)
data = self.buffer.read()
sync(
self.gcsfs.loop,
simple_upload,
self.gcsfs,
self.bucket,
self.key,
data,
self.metadata,
self.consistency,
self.content_type,
timeout=self.timeout,
)
def _fetch_range(self, start=None, end=None):
"""Get data from GCS
start, end : None or integers
if not both None, fetch only given range
"""
if start is not None or end is not None:
start = start or 0
end = end or 0
head = {"Range": "bytes=%i-%i" % (start, end - 1)}
else:
head = None
try:
_, data = self.gcsfs.call("GET", self.details["mediaLink"], headers=head)
return data
except RuntimeError as e:
if "not satisfiable" in str(e):
return b""
raise
async def upload_chunk(fs, location, data, offset, size, content_type):
head = {}
l = len(data)
range = "bytes %i-%i/%i" % (offset, offset + l - 1, size)
head["Content-Range"] = range
head.update({"Content-Type": content_type, "Content-Length": str(l)})
headers, txt = await fs._call("POST", location, headers=head, data=data)
if "Range" in headers:
end = int(headers["Range"].split("-")[1])
shortfall = (offset + l - 1) - end
if shortfall:
return await upload_chunk(
fs, location, data[-shortfall:], end, size, content_type
)
return json.loads(txt) if txt else None
async def initiate_upload(
fs, bucket, key, content_type="application/octet-stream", metadata=None
):
j = {"name": key}
if metadata:
j["metadata"] = metadata
headers, _ = await fs._call(
method="POST",
path="https://storage.googleapis.com/upload/storage"
"/v1/b/%s/o" % quote_plus(bucket),
uploadType="resumable",
json=j,
headers={"X-Upload-Content-Type": content_type},
)
loc = headers["Location"]
out = loc[0] if isinstance(loc, list) else loc # <- for CVR responses
if len(str(loc)) < 20:
logger.error("Location failed: %s" % headers)
return out
async def simple_upload(
fs,
bucket,
key,
datain,
metadatain=None,
consistency=None,
content_type="application/octet-stream",
):
checker = get_consistency_checker(consistency)
path = "https://storage.googleapis.com/upload/storage/v1/b/%s/o" % quote_plus(
bucket
)
metadata = {"name": key}
if metadatain is not None:
metadata["metadata"] = metadatain
metadata = json.dumps(metadata)
template = (
"--==0=="
"\nContent-Type: application/json; charset=UTF-8"
"\n\n"
+ metadata
+ "\n--==0=="
+ "\nContent-Type: {0}".format(content_type)
+ "\n\n"
)
data = template.encode() + datain + b"\n--==0==--"
j = await fs._call(
"POST",
path,
uploadType="multipart",
headers={"Content-Type": 'multipart/related; boundary="==0=="'},
data=data,
json_out=True,
)
checker.update(datain)
checker.validate_json_response(j)