/
grpc_asyncio.py
364 lines (321 loc) · 15.5 KB
/
grpc_asyncio.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
# -*- 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.
#
import warnings
from typing import Awaitable, Callable, Dict, Optional, Sequence, Tuple
from google.api_core import gapic_v1 # type: ignore
from google.api_core import grpc_helpers_async # type: ignore
from google import auth # type: ignore
from google.auth import credentials # type: ignore
from google.auth.transport.grpc import SslCredentials # type: ignore
import grpc # type: ignore
from grpc.experimental import aio # type: ignore
from google.cloud.bigquery_storage_v1.types import storage
from google.cloud.bigquery_storage_v1.types import stream
from .base import BigQueryReadTransport, DEFAULT_CLIENT_INFO
from .grpc import BigQueryReadGrpcTransport
class BigQueryReadGrpcAsyncIOTransport(BigQueryReadTransport):
"""gRPC AsyncIO backend transport for BigQueryRead.
BigQuery Read API.
The Read API can be used to read data from BigQuery.
This class defines the same methods as the primary client, so the
primary client can load the underlying transport implementation
and call it.
It sends protocol buffers over the wire using gRPC (which is built on
top of HTTP/2); the ``grpcio`` package must be installed.
"""
_grpc_channel: aio.Channel
_stubs: Dict[str, Callable] = {}
@classmethod
def create_channel(
cls,
host: str = "bigquerystorage.googleapis.com",
credentials: credentials.Credentials = None,
credentials_file: Optional[str] = None,
scopes: Optional[Sequence[str]] = None,
quota_project_id: Optional[str] = None,
**kwargs,
) -> aio.Channel:
"""Create and return a gRPC AsyncIO channel object.
Args:
address (Optional[str]): The host for the channel to use.
credentials (Optional[~.Credentials]): The
authorization credentials to attach to requests. These
credentials identify this application to the service. If
none are specified, the client will attempt to ascertain
the credentials from the environment.
credentials_file (Optional[str]): A file with credentials that can
be loaded with :func:`google.auth.load_credentials_from_file`.
This argument is ignored if ``channel`` is provided.
scopes (Optional[Sequence[str]]): A optional list of scopes needed for this
service. These are only used when credentials are not specified and
are passed to :func:`google.auth.default`.
quota_project_id (Optional[str]): An optional project to use for billing
and quota.
kwargs (Optional[dict]): Keyword arguments, which are passed to the
channel creation.
Returns:
aio.Channel: A gRPC AsyncIO channel object.
"""
scopes = scopes or cls.AUTH_SCOPES
return grpc_helpers_async.create_channel(
host,
credentials=credentials,
credentials_file=credentials_file,
scopes=scopes,
quota_project_id=quota_project_id,
**kwargs,
)
def __init__(
self,
*,
host: str = "bigquerystorage.googleapis.com",
credentials: credentials.Credentials = None,
credentials_file: Optional[str] = None,
scopes: Optional[Sequence[str]] = None,
channel: aio.Channel = None,
api_mtls_endpoint: str = None,
client_cert_source: Callable[[], Tuple[bytes, bytes]] = None,
ssl_channel_credentials: grpc.ChannelCredentials = None,
quota_project_id=None,
client_info: gapic_v1.client_info.ClientInfo = DEFAULT_CLIENT_INFO,
) -> None:
"""Instantiate the transport.
Args:
host (Optional[str]): The hostname to connect to.
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.
This argument is ignored if ``channel`` is provided.
credentials_file (Optional[str]): A file with credentials that can
be loaded with :func:`google.auth.load_credentials_from_file`.
This argument is ignored if ``channel`` is provided.
scopes (Optional[Sequence[str]]): A optional list of scopes needed for this
service. These are only used when credentials are not specified and
are passed to :func:`google.auth.default`.
channel (Optional[aio.Channel]): A ``Channel`` instance through
which to make calls.
api_mtls_endpoint (Optional[str]): Deprecated. The mutual TLS endpoint.
If provided, it overrides the ``host`` argument and tries to create
a mutual TLS channel with client SSL credentials from
``client_cert_source`` or applicatin default SSL credentials.
client_cert_source (Optional[Callable[[], Tuple[bytes, bytes]]]):
Deprecated. A callback to provide client SSL certificate bytes and
private key bytes, both in PEM format. It is ignored if
``api_mtls_endpoint`` is None.
ssl_channel_credentials (grpc.ChannelCredentials): SSL credentials
for grpc channel. It is ignored if ``channel`` is provided.
quota_project_id (Optional[str]): An optional project to use for billing
and quota.
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.
google.api_core.exceptions.DuplicateCredentialArgs: If both ``credentials``
and ``credentials_file`` are passed.
"""
if channel:
# Sanity check: Ensure that channel and credentials are not both
# provided.
credentials = False
# If a channel was explicitly provided, set it.
self._grpc_channel = channel
elif api_mtls_endpoint:
warnings.warn(
"api_mtls_endpoint and client_cert_source are deprecated",
DeprecationWarning,
)
host = (
api_mtls_endpoint
if ":" in api_mtls_endpoint
else api_mtls_endpoint + ":443"
)
if credentials is None:
credentials, _ = auth.default(
scopes=self.AUTH_SCOPES, quota_project_id=quota_project_id
)
# Create SSL credentials with client_cert_source or application
# default SSL credentials.
if client_cert_source:
cert, key = client_cert_source()
ssl_credentials = grpc.ssl_channel_credentials(
certificate_chain=cert, private_key=key
)
else:
ssl_credentials = SslCredentials().ssl_credentials
# create a new channel. The provided one is ignored.
self._grpc_channel = type(self).create_channel(
host,
credentials=credentials,
credentials_file=credentials_file,
ssl_credentials=ssl_credentials,
scopes=scopes or self.AUTH_SCOPES,
quota_project_id=quota_project_id,
options=(
("grpc.max_send_message_length", -1),
("grpc.max_receive_message_length", -1),
),
)
else:
host = host if ":" in host else host + ":443"
if credentials is None:
credentials, _ = auth.default(
scopes=self.AUTH_SCOPES, quota_project_id=quota_project_id
)
# create a new channel. The provided one is ignored.
self._grpc_channel = type(self).create_channel(
host,
credentials=credentials,
credentials_file=credentials_file,
ssl_credentials=ssl_channel_credentials,
scopes=scopes or self.AUTH_SCOPES,
quota_project_id=quota_project_id,
options=(
("grpc.max_send_message_length", -1),
("grpc.max_receive_message_length", -1),
),
)
# Run the base constructor.
super().__init__(
host=host,
credentials=credentials,
credentials_file=credentials_file,
scopes=scopes or self.AUTH_SCOPES,
quota_project_id=quota_project_id,
client_info=client_info,
)
self._stubs = {}
@property
def grpc_channel(self) -> aio.Channel:
"""Create the channel designed to connect to this service.
This property caches on the instance; repeated calls return
the same channel.
"""
# Return the channel from cache.
return self._grpc_channel
@property
def create_read_session(
self,
) -> Callable[[storage.CreateReadSessionRequest], Awaitable[stream.ReadSession]]:
r"""Return a callable for the create read session method over gRPC.
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 24 hours after they
are created and do not require manual clean-up by the
caller.
Returns:
Callable[[~.CreateReadSessionRequest],
Awaitable[~.ReadSession]]:
A function that, when called, will call the underlying RPC
on the server.
"""
# Generate a "stub function" on-the-fly which will actually make
# the request.
# gRPC handles serialization and deserialization, so we just need
# to pass in the functions for each.
if "create_read_session" not in self._stubs:
self._stubs["create_read_session"] = self.grpc_channel.unary_unary(
"/google.cloud.bigquery.storage.v1.BigQueryRead/CreateReadSession",
request_serializer=storage.CreateReadSessionRequest.serialize,
response_deserializer=stream.ReadSession.deserialize,
)
return self._stubs["create_read_session"]
@property
def read_rows(
self,
) -> Callable[[storage.ReadRowsRequest], Awaitable[storage.ReadRowsResponse]]:
r"""Return a callable for the read rows method over gRPC.
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.
Returns:
Callable[[~.ReadRowsRequest],
Awaitable[~.ReadRowsResponse]]:
A function that, when called, will call the underlying RPC
on the server.
"""
# Generate a "stub function" on-the-fly which will actually make
# the request.
# gRPC handles serialization and deserialization, so we just need
# to pass in the functions for each.
if "read_rows" not in self._stubs:
self._stubs["read_rows"] = self.grpc_channel.unary_stream(
"/google.cloud.bigquery.storage.v1.BigQueryRead/ReadRows",
request_serializer=storage.ReadRowsRequest.serialize,
response_deserializer=storage.ReadRowsResponse.deserialize,
)
return self._stubs["read_rows"]
@property
def split_read_stream(
self,
) -> Callable[
[storage.SplitReadStreamRequest], Awaitable[storage.SplitReadStreamResponse]
]:
r"""Return a callable for the split read stream method over gRPC.
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.
Returns:
Callable[[~.SplitReadStreamRequest],
Awaitable[~.SplitReadStreamResponse]]:
A function that, when called, will call the underlying RPC
on the server.
"""
# Generate a "stub function" on-the-fly which will actually make
# the request.
# gRPC handles serialization and deserialization, so we just need
# to pass in the functions for each.
if "split_read_stream" not in self._stubs:
self._stubs["split_read_stream"] = self.grpc_channel.unary_unary(
"/google.cloud.bigquery.storage.v1.BigQueryRead/SplitReadStream",
request_serializer=storage.SplitReadStreamRequest.serialize,
response_deserializer=storage.SplitReadStreamResponse.deserialize,
)
return self._stubs["split_read_stream"]
__all__ = ("BigQueryReadGrpcAsyncIOTransport",)