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client.py
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# -*- coding: utf-8 -*-
# Copyright 2020 Google LLC
#
# Licensed 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.
#
from collections import OrderedDict
from distutils import util
import os
import re
from typing import Dict, Optional, Iterable, Sequence, Tuple, Type, Union
import pkg_resources
from google.api_core import client_options as client_options_lib # type: ignore
from google.api_core import exceptions as core_exceptions # type: ignore
from google.api_core import gapic_v1 # type: ignore
from google.api_core import retry as retries # type: ignore
from google.auth import credentials as ga_credentials # type: ignore
from google.auth.transport import mtls # type: ignore
from google.auth.transport.grpc import SslCredentials # type: ignore
from google.auth.exceptions import MutualTLSChannelError # type: ignore
from google.oauth2 import service_account # type: ignore
from google.cloud.bigquery_storage_v1.types import arrow
from google.cloud.bigquery_storage_v1.types import avro
from google.cloud.bigquery_storage_v1.types import storage
from google.cloud.bigquery_storage_v1.types import stream
from google.protobuf import timestamp_pb2 # type: ignore
from .transports.base import BigQueryReadTransport, DEFAULT_CLIENT_INFO
from .transports.grpc import BigQueryReadGrpcTransport
from .transports.grpc_asyncio import BigQueryReadGrpcAsyncIOTransport
class BigQueryReadClientMeta(type):
"""Metaclass for the BigQueryRead client.
This provides class-level methods for building and retrieving
support objects (e.g. transport) without polluting the client instance
objects.
"""
_transport_registry = OrderedDict() # type: Dict[str, Type[BigQueryReadTransport]]
_transport_registry["grpc"] = BigQueryReadGrpcTransport
_transport_registry["grpc_asyncio"] = BigQueryReadGrpcAsyncIOTransport
def get_transport_class(cls, label: str = None,) -> Type[BigQueryReadTransport]:
"""Returns an appropriate transport class.
Args:
label: The name of the desired transport. If none is
provided, then the first transport in the registry is used.
Returns:
The transport class to use.
"""
# If a specific transport is requested, return that one.
if label:
return cls._transport_registry[label]
# No transport is requested; return the default (that is, the first one
# in the dictionary).
return next(iter(cls._transport_registry.values()))
class BigQueryReadClient(metaclass=BigQueryReadClientMeta):
"""BigQuery Read API.
The Read API can be used to read data from BigQuery.
"""
@staticmethod
def _get_default_mtls_endpoint(api_endpoint):
"""Converts api endpoint to mTLS endpoint.
Convert "*.sandbox.googleapis.com" and "*.googleapis.com" to
"*.mtls.sandbox.googleapis.com" and "*.mtls.googleapis.com" respectively.
Args:
api_endpoint (Optional[str]): the api endpoint to convert.
Returns:
str: converted mTLS api endpoint.
"""
if not api_endpoint:
return api_endpoint
mtls_endpoint_re = re.compile(
r"(?P<name>[^.]+)(?P<mtls>\.mtls)?(?P<sandbox>\.sandbox)?(?P<googledomain>\.googleapis\.com)?"
)
m = mtls_endpoint_re.match(api_endpoint)
name, mtls, sandbox, googledomain = m.groups()
if mtls or not googledomain:
return api_endpoint
if sandbox:
return api_endpoint.replace(
"sandbox.googleapis.com", "mtls.sandbox.googleapis.com"
)
return api_endpoint.replace(".googleapis.com", ".mtls.googleapis.com")
DEFAULT_ENDPOINT = "bigquerystorage.googleapis.com"
DEFAULT_MTLS_ENDPOINT = _get_default_mtls_endpoint.__func__( # type: ignore
DEFAULT_ENDPOINT
)
@classmethod
def from_service_account_info(cls, info: dict, *args, **kwargs):
"""Creates an instance of this client using the provided credentials
info.
Args:
info (dict): The service account private key info.
args: Additional arguments to pass to the constructor.
kwargs: Additional arguments to pass to the constructor.
Returns:
BigQueryReadClient: The constructed client.
"""
credentials = service_account.Credentials.from_service_account_info(info)
kwargs["credentials"] = credentials
return cls(*args, **kwargs)
@classmethod
def from_service_account_file(cls, filename: str, *args, **kwargs):
"""Creates an instance of this client using the provided credentials
file.
Args:
filename (str): The path to the service account private key json
file.
args: Additional arguments to pass to the constructor.
kwargs: Additional arguments to pass to the constructor.
Returns:
BigQueryReadClient: The constructed client.
"""
credentials = service_account.Credentials.from_service_account_file(filename)
kwargs["credentials"] = credentials
return cls(*args, **kwargs)
from_service_account_json = from_service_account_file
@property
def transport(self) -> BigQueryReadTransport:
"""Returns the transport used by the client instance.
Returns:
BigQueryReadTransport: The transport used by the client
instance.
"""
return self._transport
@staticmethod
def read_session_path(project: str, location: str, session: str,) -> str:
"""Returns a fully-qualified read_session string."""
return "projects/{project}/locations/{location}/sessions/{session}".format(
project=project, location=location, session=session,
)
@staticmethod
def parse_read_session_path(path: str) -> Dict[str, str]:
"""Parses a read_session path into its component segments."""
m = re.match(
r"^projects/(?P<project>.+?)/locations/(?P<location>.+?)/sessions/(?P<session>.+?)$",
path,
)
return m.groupdict() if m else {}
@staticmethod
def read_stream_path(
project: str, location: str, session: str, stream: str,
) -> str:
"""Returns a fully-qualified read_stream string."""
return "projects/{project}/locations/{location}/sessions/{session}/streams/{stream}".format(
project=project, location=location, session=session, stream=stream,
)
@staticmethod
def parse_read_stream_path(path: str) -> Dict[str, str]:
"""Parses a read_stream path into its component segments."""
m = re.match(
r"^projects/(?P<project>.+?)/locations/(?P<location>.+?)/sessions/(?P<session>.+?)/streams/(?P<stream>.+?)$",
path,
)
return m.groupdict() if m else {}
@staticmethod
def table_path(project: str, dataset: str, table: str,) -> str:
"""Returns a fully-qualified table string."""
return "projects/{project}/datasets/{dataset}/tables/{table}".format(
project=project, dataset=dataset, table=table,
)
@staticmethod
def parse_table_path(path: str) -> Dict[str, str]:
"""Parses a table path into its component segments."""
m = re.match(
r"^projects/(?P<project>.+?)/datasets/(?P<dataset>.+?)/tables/(?P<table>.+?)$",
path,
)
return m.groupdict() if m else {}
@staticmethod
def common_billing_account_path(billing_account: str,) -> str:
"""Returns a fully-qualified billing_account string."""
return "billingAccounts/{billing_account}".format(
billing_account=billing_account,
)
@staticmethod
def parse_common_billing_account_path(path: str) -> Dict[str, str]:
"""Parse a billing_account path into its component segments."""
m = re.match(r"^billingAccounts/(?P<billing_account>.+?)$", path)
return m.groupdict() if m else {}
@staticmethod
def common_folder_path(folder: str,) -> str:
"""Returns a fully-qualified folder string."""
return "folders/{folder}".format(folder=folder,)
@staticmethod
def parse_common_folder_path(path: str) -> Dict[str, str]:
"""Parse a folder path into its component segments."""
m = re.match(r"^folders/(?P<folder>.+?)$", path)
return m.groupdict() if m else {}
@staticmethod
def common_organization_path(organization: str,) -> str:
"""Returns a fully-qualified organization string."""
return "organizations/{organization}".format(organization=organization,)
@staticmethod
def parse_common_organization_path(path: str) -> Dict[str, str]:
"""Parse a organization path into its component segments."""
m = re.match(r"^organizations/(?P<organization>.+?)$", path)
return m.groupdict() if m else {}
@staticmethod
def common_project_path(project: str,) -> str:
"""Returns a fully-qualified project string."""
return "projects/{project}".format(project=project,)
@staticmethod
def parse_common_project_path(path: str) -> Dict[str, str]:
"""Parse a project path into its component segments."""
m = re.match(r"^projects/(?P<project>.+?)$", path)
return m.groupdict() if m else {}
@staticmethod
def common_location_path(project: str, location: str,) -> str:
"""Returns a fully-qualified location string."""
return "projects/{project}/locations/{location}".format(
project=project, location=location,
)
@staticmethod
def parse_common_location_path(path: str) -> Dict[str, str]:
"""Parse a location path into its component segments."""
m = re.match(r"^projects/(?P<project>.+?)/locations/(?P<location>.+?)$", path)
return m.groupdict() if m else {}
def __init__(
self,
*,
credentials: Optional[ga_credentials.Credentials] = None,
transport: Union[str, BigQueryReadTransport, None] = None,
client_options: Optional[client_options_lib.ClientOptions] = None,
client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
) -> None:
"""Instantiates the big query read client.
Args:
credentials (Optional[google.auth.credentials.Credentials]): The
authorization credentials to attach to requests. These
credentials identify the application to the service; if none
are specified, the client will attempt to ascertain the
credentials from the environment.
transport (Union[str, BigQueryReadTransport]): The
transport to use. If set to None, a transport is chosen
automatically.
client_options (google.api_core.client_options.ClientOptions): Custom options for the
client. It won't take effect if a ``transport`` instance is provided.
(1) The ``api_endpoint`` property can be used to override the
default endpoint provided by the client. GOOGLE_API_USE_MTLS_ENDPOINT
environment variable can also be used to override the endpoint:
"always" (always use the default mTLS endpoint), "never" (always
use the default regular endpoint) and "auto" (auto switch to the
default mTLS endpoint if client certificate is present, this is
the default value). However, the ``api_endpoint`` property takes
precedence if provided.
(2) If GOOGLE_API_USE_CLIENT_CERTIFICATE environment variable
is "true", then the ``client_cert_source`` property can be used
to provide client certificate for mutual TLS transport. If
not provided, the default SSL client certificate will be used if
present. If GOOGLE_API_USE_CLIENT_CERTIFICATE is "false" or not
set, no client certificate will be used.
client_info (google.api_core.gapic_v1.client_info.ClientInfo):
The client info used to send a user-agent string along with
API requests. If ``None``, then default info will be used.
Generally, you only need to set this if you're developing
your own client library.
Raises:
google.auth.exceptions.MutualTLSChannelError: If mutual TLS transport
creation failed for any reason.
"""
if isinstance(client_options, dict):
client_options = client_options_lib.from_dict(client_options)
if client_options is None:
client_options = client_options_lib.ClientOptions()
# Create SSL credentials for mutual TLS if needed.
use_client_cert = bool(
util.strtobool(os.getenv("GOOGLE_API_USE_CLIENT_CERTIFICATE", "false"))
)
client_cert_source_func = None
is_mtls = False
if use_client_cert:
if client_options.client_cert_source:
is_mtls = True
client_cert_source_func = client_options.client_cert_source
else:
is_mtls = mtls.has_default_client_cert_source()
if is_mtls:
client_cert_source_func = mtls.default_client_cert_source()
else:
client_cert_source_func = None
# Figure out which api endpoint to use.
if client_options.api_endpoint is not None:
api_endpoint = client_options.api_endpoint
else:
use_mtls_env = os.getenv("GOOGLE_API_USE_MTLS_ENDPOINT", "auto")
if use_mtls_env == "never":
api_endpoint = self.DEFAULT_ENDPOINT
elif use_mtls_env == "always":
api_endpoint = self.DEFAULT_MTLS_ENDPOINT
elif use_mtls_env == "auto":
if is_mtls:
api_endpoint = self.DEFAULT_MTLS_ENDPOINT
else:
api_endpoint = self.DEFAULT_ENDPOINT
else:
raise MutualTLSChannelError(
"Unsupported GOOGLE_API_USE_MTLS_ENDPOINT value. Accepted "
"values: never, auto, always"
)
# Save or instantiate the transport.
# Ordinarily, we provide the transport, but allowing a custom transport
# instance provides an extensibility point for unusual situations.
if isinstance(transport, BigQueryReadTransport):
# transport is a BigQueryReadTransport instance.
if credentials or client_options.credentials_file:
raise ValueError(
"When providing a transport instance, "
"provide its credentials directly."
)
if client_options.scopes:
raise ValueError(
"When providing a transport instance, provide its scopes "
"directly."
)
self._transport = transport
else:
Transport = type(self).get_transport_class(transport)
self._transport = Transport(
credentials=credentials,
credentials_file=client_options.credentials_file,
host=api_endpoint,
scopes=client_options.scopes,
client_cert_source_for_mtls=client_cert_source_func,
quota_project_id=client_options.quota_project_id,
client_info=client_info,
always_use_jwt_access=True,
)
def create_read_session(
self,
request: Union[storage.CreateReadSessionRequest, dict] = None,
*,
parent: str = None,
read_session: stream.ReadSession = None,
max_stream_count: int = None,
retry: retries.Retry = gapic_v1.method.DEFAULT,
timeout: float = None,
metadata: Sequence[Tuple[str, str]] = (),
) -> stream.ReadSession:
r"""Creates a new read session. A read session divides
the contents of a BigQuery table into one or more
streams, which can then be used to read data from the
table. The read session also specifies properties of the
data to be read, such as a list of columns or a push-
down filter describing the rows to be returned.
A particular row can be read by at most one stream. When
the caller has reached the end of each stream in the
session, then all the data in the table has been read.
Data is assigned to each stream such that roughly the
same number of rows can be read from each stream.
Because the server-side unit for assigning data is
collections of rows, the API does not guarantee that
each stream will return the same number or rows.
Additionally, the limits are enforced based on the
number of pre-filtered rows, so some filters can lead to
lopsided assignments.
Read sessions automatically expire 6 hours after they
are created and do not require manual clean-up by the
caller.
Args:
request (Union[google.cloud.bigquery_storage_v1.types.CreateReadSessionRequest, dict]):
The request object. Request message for
`CreateReadSession`.
parent (str):
Required. The request project that owns the session, in
the form of ``projects/{project_id}``.
This corresponds to the ``parent`` field
on the ``request`` instance; if ``request`` is provided, this
should not be set.
read_session (google.cloud.bigquery_storage_v1.types.ReadSession):
Required. Session to be created.
This corresponds to the ``read_session`` field
on the ``request`` instance; if ``request`` is provided, this
should not be set.
max_stream_count (int):
Max initial number of streams. If
unset or zero, the server will provide a
value of streams so as to produce
reasonable throughput. Must be non-
negative. The number of streams may be
lower than the requested number,
depending on the amount parallelism that
is reasonable for the table. Error will
be returned if the max count is greater
than the current system max limit of
1,000.
Streams must be read starting from
offset 0.
This corresponds to the ``max_stream_count`` field
on the ``request`` instance; if ``request`` is provided, this
should not be set.
retry (google.api_core.retry.Retry): Designation of what errors, if any,
should be retried.
timeout (float): The timeout for this request.
metadata (Sequence[Tuple[str, str]]): Strings which should be
sent along with the request as metadata.
Returns:
google.cloud.bigquery_storage_v1.types.ReadSession:
Information about the ReadSession.
"""
# Create or coerce a protobuf request object.
# Sanity check: If we got a request object, we should *not* have
# gotten any keyword arguments that map to the request.
has_flattened_params = any([parent, read_session, max_stream_count])
if request is not None and has_flattened_params:
raise ValueError(
"If the `request` argument is set, then none of "
"the individual field arguments should be set."
)
# Minor optimization to avoid making a copy if the user passes
# in a storage.CreateReadSessionRequest.
# There's no risk of modifying the input as we've already verified
# there are no flattened fields.
if not isinstance(request, storage.CreateReadSessionRequest):
request = storage.CreateReadSessionRequest(request)
# If we have keyword arguments corresponding to fields on the
# request, apply these.
if parent is not None:
request.parent = parent
if read_session is not None:
request.read_session = read_session
if max_stream_count is not None:
request.max_stream_count = max_stream_count
# Wrap the RPC method; this adds retry and timeout information,
# and friendly error handling.
rpc = self._transport._wrapped_methods[self._transport.create_read_session]
# Certain fields should be provided within the metadata header;
# add these here.
metadata = tuple(metadata) + (
gapic_v1.routing_header.to_grpc_metadata(
(("read_session.table", request.read_session.table),)
),
)
# Send the request.
response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)
# Done; return the response.
return response
def read_rows(
self,
request: Union[storage.ReadRowsRequest, dict] = None,
*,
read_stream: str = None,
offset: int = None,
retry: retries.Retry = gapic_v1.method.DEFAULT,
timeout: float = None,
metadata: Sequence[Tuple[str, str]] = (),
) -> Iterable[storage.ReadRowsResponse]:
r"""Reads rows from the stream in the format prescribed
by the ReadSession. Each response contains one or more
table rows, up to a maximum of 100 MiB per response;
read requests which attempt to read individual rows
larger than 100 MiB will fail.
Each request also returns a set of stream statistics
reflecting the current state of the stream.
Args:
request (Union[google.cloud.bigquery_storage_v1.types.ReadRowsRequest, dict]):
The request object. Request message for `ReadRows`.
read_stream (str):
Required. Stream to read rows from.
This corresponds to the ``read_stream`` field
on the ``request`` instance; if ``request`` is provided, this
should not be set.
offset (int):
The offset requested must be less
than the last row read from Read.
Requesting a larger offset is undefined.
If not specified, start reading from
offset zero.
This corresponds to the ``offset`` field
on the ``request`` instance; if ``request`` is provided, this
should not be set.
retry (google.api_core.retry.Retry): Designation of what errors, if any,
should be retried.
timeout (float): The timeout for this request.
metadata (Sequence[Tuple[str, str]]): Strings which should be
sent along with the request as metadata.
Returns:
Iterable[google.cloud.bigquery_storage_v1.types.ReadRowsResponse]:
Response from calling ReadRows may include row data, progress and
throttling information.
"""
# Create or coerce a protobuf request object.
# Sanity check: If we got a request object, we should *not* have
# gotten any keyword arguments that map to the request.
has_flattened_params = any([read_stream, offset])
if request is not None and has_flattened_params:
raise ValueError(
"If the `request` argument is set, then none of "
"the individual field arguments should be set."
)
# Minor optimization to avoid making a copy if the user passes
# in a storage.ReadRowsRequest.
# There's no risk of modifying the input as we've already verified
# there are no flattened fields.
if not isinstance(request, storage.ReadRowsRequest):
request = storage.ReadRowsRequest(request)
# If we have keyword arguments corresponding to fields on the
# request, apply these.
if read_stream is not None:
request.read_stream = read_stream
if offset is not None:
request.offset = offset
# Wrap the RPC method; this adds retry and timeout information,
# and friendly error handling.
rpc = self._transport._wrapped_methods[self._transport.read_rows]
# Certain fields should be provided within the metadata header;
# add these here.
metadata = tuple(metadata) + (
gapic_v1.routing_header.to_grpc_metadata(
(("read_stream", request.read_stream),)
),
)
# Send the request.
response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)
# Done; return the response.
return response
def split_read_stream(
self,
request: Union[storage.SplitReadStreamRequest, dict] = None,
*,
retry: retries.Retry = gapic_v1.method.DEFAULT,
timeout: float = None,
metadata: Sequence[Tuple[str, str]] = (),
) -> storage.SplitReadStreamResponse:
r"""Splits a given ``ReadStream`` into two ``ReadStream`` objects.
These ``ReadStream`` objects are referred to as the primary and
the residual streams of the split. The original ``ReadStream``
can still be read from in the same manner as before. Both of the
returned ``ReadStream`` objects can also be read from, and the
rows returned by both child streams will be the same as the rows
read from the original stream.
Moreover, the two child streams will be allocated back-to-back
in the original ``ReadStream``. Concretely, it is guaranteed
that for streams original, primary, and residual, that
original[0-j] = primary[0-j] and original[j-n] = residual[0-m]
once the streams have been read to completion.
Args:
request (Union[google.cloud.bigquery_storage_v1.types.SplitReadStreamRequest, dict]):
The request object. Request message for
`SplitReadStream`.
retry (google.api_core.retry.Retry): Designation of what errors, if any,
should be retried.
timeout (float): The timeout for this request.
metadata (Sequence[Tuple[str, str]]): Strings which should be
sent along with the request as metadata.
Returns:
google.cloud.bigquery_storage_v1.types.SplitReadStreamResponse:
Response message for SplitReadStream.
"""
# Create or coerce a protobuf request object.
# Minor optimization to avoid making a copy if the user passes
# in a storage.SplitReadStreamRequest.
# There's no risk of modifying the input as we've already verified
# there are no flattened fields.
if not isinstance(request, storage.SplitReadStreamRequest):
request = storage.SplitReadStreamRequest(request)
# Wrap the RPC method; this adds retry and timeout information,
# and friendly error handling.
rpc = self._transport._wrapped_methods[self._transport.split_read_stream]
# Certain fields should be provided within the metadata header;
# add these here.
metadata = tuple(metadata) + (
gapic_v1.routing_header.to_grpc_metadata((("name", request.name),)),
)
# Send the request.
response = rpc(request, retry=retry, timeout=timeout, metadata=metadata,)
# Done; return the response.
return response
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
"""Releases underlying transport's resources.
.. warning::
ONLY use as a context manager if the transport is NOT shared
with other clients! Exiting the with block will CLOSE the transport
and may cause errors in other clients!
"""
self.transport.close()
try:
DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo(
gapic_version=pkg_resources.get_distribution(
"google-cloud-bigquery-storage",
).version,
)
except pkg_resources.DistributionNotFound:
DEFAULT_CLIENT_INFO = gapic_v1.client_info.ClientInfo()
__all__ = ("BigQueryReadClient",)