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big_query_read_client.go
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big_query_read_client.go
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// 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
//
// https://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.
// Code generated by protoc-gen-go_gapic. DO NOT EDIT.
package storage
import (
"context"
"fmt"
"math"
"net/url"
"time"
gax "github.com/googleapis/gax-go/v2"
"google.golang.org/api/option"
gtransport "google.golang.org/api/transport/grpc"
storagepb "google.golang.org/genproto/googleapis/cloud/bigquery/storage/v1beta2"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
)
var newBigQueryReadClientHook clientHook
// BigQueryReadCallOptions contains the retry settings for each method of BigQueryReadClient.
type BigQueryReadCallOptions struct {
CreateReadSession []gax.CallOption
ReadRows []gax.CallOption
SplitReadStream []gax.CallOption
}
func defaultBigQueryReadClientOptions() []option.ClientOption {
return []option.ClientOption{
option.WithEndpoint("bigquerystorage.googleapis.com:443"),
option.WithGRPCDialOption(grpc.WithDisableServiceConfig()),
option.WithScopes(DefaultAuthScopes()...),
option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
grpc.MaxCallRecvMsgSize(math.MaxInt32))),
}
}
func defaultBigQueryReadCallOptions() *BigQueryReadCallOptions {
return &BigQueryReadCallOptions{
CreateReadSession: []gax.CallOption{
gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.DeadlineExceeded,
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60000 * time.Millisecond,
Multiplier: 1.30,
})
}),
},
ReadRows: []gax.CallOption{
gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60000 * time.Millisecond,
Multiplier: 1.30,
})
}),
},
SplitReadStream: []gax.CallOption{
gax.WithRetry(func() gax.Retryer {
return gax.OnCodes([]codes.Code{
codes.DeadlineExceeded,
codes.Unavailable,
}, gax.Backoff{
Initial: 100 * time.Millisecond,
Max: 60000 * time.Millisecond,
Multiplier: 1.30,
})
}),
},
}
}
// BigQueryReadClient is a client for interacting with BigQuery Storage API.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type BigQueryReadClient struct {
// Connection pool of gRPC connections to the service.
connPool gtransport.ConnPool
// The gRPC API client.
bigQueryReadClient storagepb.BigQueryReadClient
// The call options for this service.
CallOptions *BigQueryReadCallOptions
// The x-goog-* metadata to be sent with each request.
xGoogMetadata metadata.MD
}
// NewBigQueryReadClient creates a new big query read client.
//
// BigQuery Read API.
//
// The Read API can be used to read data from BigQuery.
func NewBigQueryReadClient(ctx context.Context, opts ...option.ClientOption) (*BigQueryReadClient, error) {
clientOpts := defaultBigQueryReadClientOptions()
if newBigQueryReadClientHook != nil {
hookOpts, err := newBigQueryReadClientHook(ctx, clientHookParams{})
if err != nil {
return nil, err
}
clientOpts = append(clientOpts, hookOpts...)
}
connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
if err != nil {
return nil, err
}
c := &BigQueryReadClient{
connPool: connPool,
CallOptions: defaultBigQueryReadCallOptions(),
bigQueryReadClient: storagepb.NewBigQueryReadClient(connPool),
}
c.setGoogleClientInfo()
return c, nil
}
// Connection returns a connection to the API service.
//
// Deprecated.
func (c *BigQueryReadClient) Connection() *grpc.ClientConn {
return c.connPool.Conn()
}
// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *BigQueryReadClient) Close() error {
return c.connPool.Close()
}
// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *BigQueryReadClient) setGoogleClientInfo(keyval ...string) {
kv := append([]string{"gl-go", versionGo()}, keyval...)
kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}
// CreateReadSession 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.
func (c *BigQueryReadClient) CreateReadSession(ctx context.Context, req *storagepb.CreateReadSessionRequest, opts ...gax.CallOption) (*storagepb.ReadSession, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "read_session.table", url.QueryEscape(req.GetReadSession().GetTable())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.CreateReadSession[0:len(c.CallOptions.CreateReadSession):len(c.CallOptions.CreateReadSession)], opts...)
var resp *storagepb.ReadSession
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.bigQueryReadClient.CreateReadSession(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// ReadRows 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.
func (c *BigQueryReadClient) ReadRows(ctx context.Context, req *storagepb.ReadRowsRequest, opts ...gax.CallOption) (storagepb.BigQueryRead_ReadRowsClient, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "read_stream", url.QueryEscape(req.GetReadStream())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.ReadRows[0:len(c.CallOptions.ReadRows):len(c.CallOptions.ReadRows)], opts...)
var resp storagepb.BigQueryRead_ReadRowsClient
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.bigQueryReadClient.ReadRows(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}
// SplitReadStream 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.
func (c *BigQueryReadClient) SplitReadStream(ctx context.Context, req *storagepb.SplitReadStreamRequest, opts ...gax.CallOption) (*storagepb.SplitReadStreamResponse, error) {
md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
ctx = insertMetadata(ctx, c.xGoogMetadata, md)
opts = append(c.CallOptions.SplitReadStream[0:len(c.CallOptions.SplitReadStream):len(c.CallOptions.SplitReadStream)], opts...)
var resp *storagepb.SplitReadStreamResponse
err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
var err error
resp, err = c.bigQueryReadClient.SplitReadStream(ctx, req, settings.GRPC...)
return err
}, opts...)
if err != nil {
return nil, err
}
return resp, nil
}