retail/apiv2/completion_client.go - gocloud - Git at Google

 // Copyright 2024 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 retail

 import (
 	"context"
 	"fmt"
 	"math"
 	"net/url"
 	"time"

 	"cloud.google.com/go/longrunning"
 	lroauto "cloud.google.com/go/longrunning/autogen"
 	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
 	retailpb "cloud.google.com/go/retail/apiv2/retailpb"
 	gax "github.com/googleapis/gax-go/v2"
 	"google.golang.org/api/iterator"
 	"google.golang.org/api/option"
 	"google.golang.org/api/option/internaloption"
 	gtransport "google.golang.org/api/transport/grpc"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/protobuf/proto"
 )

 var newCompletionClientHook clientHook

 // CompletionCallOptions contains the retry settings for each method of CompletionClient.
 type CompletionCallOptions struct {
 	CompleteQuery        []gax.CallOption
 	ImportCompletionData []gax.CallOption
 	GetOperation         []gax.CallOption
 	ListOperations       []gax.CallOption
 }

 func defaultCompletionGRPCClientOptions() []option.ClientOption {
 	return []option.ClientOption{
 		internaloption.WithDefaultEndpoint("retail.googleapis.com:443"),
 		internaloption.WithDefaultEndpointTemplate("retail.UNIVERSE_DOMAIN:443"),
 		internaloption.WithDefaultMTLSEndpoint("retail.mtls.googleapis.com:443"),
 		internaloption.WithDefaultUniverseDomain("googleapis.com"),
 		internaloption.WithDefaultAudience("https://retail.googleapis.com/"),
 		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
 		internaloption.EnableJwtWithScope(),
 		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
 			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
 	}
 }

 func defaultCompletionCallOptions() *CompletionCallOptions {
 	return &CompletionCallOptions{
 		CompleteQuery: []gax.CallOption{
 			gax.WithTimeout(5000 * time.Millisecond),
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.Unavailable,
 					codes.DeadlineExceeded,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        5000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 		ImportCompletionData: []gax.CallOption{
 			gax.WithTimeout(5000 * time.Millisecond),
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.Unavailable,
 					codes.DeadlineExceeded,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        5000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 		GetOperation: []gax.CallOption{},
 		ListOperations: []gax.CallOption{
 			gax.WithTimeout(300000 * time.Millisecond),
 			gax.WithRetry(func() gax.Retryer {
 				return gax.OnCodes([]codes.Code{
 					codes.Unavailable,
 					codes.DeadlineExceeded,
 				}, gax.Backoff{
 					Initial:    100 * time.Millisecond,
 					Max:        300000 * time.Millisecond,
 					Multiplier: 1.30,
 				})
 			}),
 		},
 	}
 }

 // internalCompletionClient is an interface that defines the methods available from Retail API.
 type internalCompletionClient interface {
 	Close() error
 	setGoogleClientInfo(...string)
 	Connection() *grpc.ClientConn
 	CompleteQuery(context.Context, *retailpb.CompleteQueryRequest, ...gax.CallOption) (*retailpb.CompleteQueryResponse, error)
 	ImportCompletionData(context.Context, *retailpb.ImportCompletionDataRequest, ...gax.CallOption) (*ImportCompletionDataOperation, error)
 	ImportCompletionDataOperation(name string) *ImportCompletionDataOperation
 	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
 	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
 }

 // CompletionClient is a client for interacting with Retail API.
 // Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
 //
 // Autocomplete service for retail.
 //
 // This feature is only available for users who have Retail Search enabled.
 // Enable Retail Search on Cloud Console before using this feature.
 type CompletionClient struct {
 	// The internal transport-dependent client.
 	internalClient internalCompletionClient

 	// The call options for this service.
 	CallOptions *CompletionCallOptions

 	// LROClient is used internally to handle long-running operations.
 	// It is exposed so that its CallOptions can be modified if required.
 	// Users should not Close this client.
 	LROClient *lroauto.OperationsClient
 }

 // Wrapper methods routed to the internal client.

 // Close closes the connection to the API service. The user should invoke this when
 // the client is no longer required.
 func (c *CompletionClient) Close() error {
 	return c.internalClient.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 *CompletionClient) setGoogleClientInfo(keyval ...string) {
 	c.internalClient.setGoogleClientInfo(keyval...)
 }

 // Connection returns a connection to the API service.
 //
 // Deprecated: Connections are now pooled so this method does not always
 // return the same resource.
 func (c *CompletionClient) Connection() *grpc.ClientConn {
 	return c.internalClient.Connection()
 }

 // CompleteQuery completes the specified prefix with keyword suggestions.
 //
 // This feature is only available for users who have Retail Search enabled.
 // Enable Retail Search on Cloud Console before using this feature.
 func (c *CompletionClient) CompleteQuery(ctx context.Context, req *retailpb.CompleteQueryRequest, opts ...gax.CallOption) (*retailpb.CompleteQueryResponse, error) {
 	return c.internalClient.CompleteQuery(ctx, req, opts...)
 }

 // ImportCompletionData bulk import of processed completion dataset.
 //
 // Request processing is asynchronous. Partial updating is not supported.
 //
 // The operation is successfully finished only after the imported suggestions
 // are indexed successfully and ready for serving. The process takes hours.
 //
 // This feature is only available for users who have Retail Search enabled.
 // Enable Retail Search on Cloud Console before using this feature.
 func (c *CompletionClient) ImportCompletionData(ctx context.Context, req *retailpb.ImportCompletionDataRequest, opts ...gax.CallOption) (*ImportCompletionDataOperation, error) {
 	return c.internalClient.ImportCompletionData(ctx, req, opts...)
 }

 // ImportCompletionDataOperation returns a new ImportCompletionDataOperation from a given name.
 // The name must be that of a previously created ImportCompletionDataOperation, possibly from a different process.
 func (c *CompletionClient) ImportCompletionDataOperation(name string) *ImportCompletionDataOperation {
 	return c.internalClient.ImportCompletionDataOperation(name)
 }

 // GetOperation is a utility method from google.longrunning.Operations.
 func (c *CompletionClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
 	return c.internalClient.GetOperation(ctx, req, opts...)
 }

 // ListOperations is a utility method from google.longrunning.Operations.
 func (c *CompletionClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
 	return c.internalClient.ListOperations(ctx, req, opts...)
 }

 // completionGRPCClient is a client for interacting with Retail API over gRPC transport.
 //
 // Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
 type completionGRPCClient struct {
 	// Connection pool of gRPC connections to the service.
 	connPool gtransport.ConnPool

 	// Points back to the CallOptions field of the containing CompletionClient
 	CallOptions **CompletionCallOptions

 	// The gRPC API client.
 	completionClient retailpb.CompletionServiceClient

 	// LROClient is used internally to handle long-running operations.
 	// It is exposed so that its CallOptions can be modified if required.
 	// Users should not Close this client.
 	LROClient **lroauto.OperationsClient

 	operationsClient longrunningpb.OperationsClient

 	// The x-goog-* metadata to be sent with each request.
 	xGoogHeaders []string
 }

 // NewCompletionClient creates a new completion service client based on gRPC.
 // The returned client must be Closed when it is done being used to clean up its underlying connections.
 //
 // Autocomplete service for retail.
 //
 // This feature is only available for users who have Retail Search enabled.
 // Enable Retail Search on Cloud Console before using this feature.
 func NewCompletionClient(ctx context.Context, opts ...option.ClientOption) (*CompletionClient, error) {
 	clientOpts := defaultCompletionGRPCClientOptions()
 	if newCompletionClientHook != nil {
 		hookOpts, err := newCompletionClientHook(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
 	}
 	client := CompletionClient{CallOptions: defaultCompletionCallOptions()}

 	c := &completionGRPCClient{
 		connPool:         connPool,
 		completionClient: retailpb.NewCompletionServiceClient(connPool),
 		CallOptions:      &client.CallOptions,
 		operationsClient: longrunningpb.NewOperationsClient(connPool),
 	}
 	c.setGoogleClientInfo()

 	client.internalClient = c

 	client.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
 	if err != nil {
 		// This error "should not happen", since we are just reusing old connection pool
 		// and never actually need to dial.
 		// If this does happen, we could leak connp. However, we cannot close conn:
 		// If the user invoked the constructor with option.WithGRPCConn,
 		// we would close a connection that's still in use.
 		// TODO: investigate error conditions.
 		return nil, err
 	}
 	c.LROClient = &client.LROClient
 	return &client, nil
 }

 // Connection returns a connection to the API service.
 //
 // Deprecated: Connections are now pooled so this method does not always
 // return the same resource.
 func (c *completionGRPCClient) Connection() *grpc.ClientConn {
 	return c.connPool.Conn()
 }

 // 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 *completionGRPCClient) setGoogleClientInfo(keyval ...string) {
 	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
 	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
 	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
 }

 // Close closes the connection to the API service. The user should invoke this when
 // the client is no longer required.
 func (c *completionGRPCClient) Close() error {
 	return c.connPool.Close()
 }

 func (c *completionGRPCClient) CompleteQuery(ctx context.Context, req *retailpb.CompleteQueryRequest, opts ...gax.CallOption) (*retailpb.CompleteQueryResponse, error) {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "catalog", url.QueryEscape(req.GetCatalog()))}

 	hds = append(c.xGoogHeaders, hds...)
 	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
 	opts = append((*c.CallOptions).CompleteQuery[0:len((*c.CallOptions).CompleteQuery):len((*c.CallOptions).CompleteQuery)], opts...)
 	var resp *retailpb.CompleteQueryResponse
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.completionClient.CompleteQuery(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 func (c *completionGRPCClient) ImportCompletionData(ctx context.Context, req *retailpb.ImportCompletionDataRequest, opts ...gax.CallOption) (*ImportCompletionDataOperation, error) {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

 	hds = append(c.xGoogHeaders, hds...)
 	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
 	opts = append((*c.CallOptions).ImportCompletionData[0:len((*c.CallOptions).ImportCompletionData):len((*c.CallOptions).ImportCompletionData)], opts...)
 	var resp *longrunningpb.Operation
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.completionClient.ImportCompletionData(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return &ImportCompletionDataOperation{
 		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
 	}, nil
 }

 func (c *completionGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

 	hds = append(c.xGoogHeaders, hds...)
 	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
 	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
 	var resp *longrunningpb.Operation
 	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		var err error
 		resp, err = c.operationsClient.GetOperation(ctx, req, settings.GRPC...)
 		return err
 	}, opts...)
 	if err != nil {
 		return nil, err
 	}
 	return resp, nil
 }

 func (c *completionGRPCClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

 	hds = append(c.xGoogHeaders, hds...)
 	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
 	opts = append((*c.CallOptions).ListOperations[0:len((*c.CallOptions).ListOperations):len((*c.CallOptions).ListOperations)], opts...)
 	it := &OperationIterator{}
 	req = proto.Clone(req).(*longrunningpb.ListOperationsRequest)
 	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
 		resp := &longrunningpb.ListOperationsResponse{}
 		if pageToken != "" {
 			req.PageToken = pageToken
 		}
 		if pageSize > math.MaxInt32 {
 			req.PageSize = math.MaxInt32
 		} else if pageSize != 0 {
 			req.PageSize = int32(pageSize)
 		}
 		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 			var err error
 			resp, err = c.operationsClient.ListOperations(ctx, req, settings.GRPC...)
 			return err
 		}, opts...)
 		if err != nil {
 			return nil, "", err
 		}

 		it.Response = resp
 		return resp.GetOperations(), resp.GetNextPageToken(), nil
 	}
 	fetch := func(pageSize int, pageToken string) (string, error) {
 		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
 		if err != nil {
 			return "", err
 		}
 		it.items = append(it.items, items...)
 		return nextPageToken, nil
 	}

 	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
 	it.pageInfo.MaxSize = int(req.GetPageSize())
 	it.pageInfo.Token = req.GetPageToken()

 	return it
 }

 // ImportCompletionDataOperation returns a new ImportCompletionDataOperation from a given name.
 // The name must be that of a previously created ImportCompletionDataOperation, possibly from a different process.
 func (c *completionGRPCClient) ImportCompletionDataOperation(name string) *ImportCompletionDataOperation {
 	return &ImportCompletionDataOperation{
 		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
 	}
 }
	// Copyright 2024 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 retail

	import (
	"context"
	"fmt"
	"math"
	"net/url"
	"time"

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
	retailpb "cloud.google.com/go/retail/apiv2/retailpb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/protobuf/proto"
	)

	var newCompletionClientHook clientHook

	// CompletionCallOptions contains the retry settings for each method of CompletionClient.
	type CompletionCallOptions struct {
	CompleteQuery []gax.CallOption
	ImportCompletionData []gax.CallOption
	GetOperation []gax.CallOption
	ListOperations []gax.CallOption
	}

	func defaultCompletionGRPCClientOptions() []option.ClientOption {
	return []option.ClientOption{
	internaloption.WithDefaultEndpoint("retail.googleapis.com:443"),
	internaloption.WithDefaultEndpointTemplate("retail.UNIVERSE_DOMAIN:443"),
	internaloption.WithDefaultMTLSEndpoint("retail.mtls.googleapis.com:443"),
	internaloption.WithDefaultUniverseDomain("googleapis.com"),
	internaloption.WithDefaultAudience("https://retail.googleapis.com/"),
	internaloption.WithDefaultScopes(DefaultAuthScopes()...),
	internaloption.EnableJwtWithScope(),
	option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
	grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
	}

	func defaultCompletionCallOptions() *CompletionCallOptions {
	return &CompletionCallOptions{
	CompleteQuery: []gax.CallOption{
	gax.WithTimeout(5000 * time.Millisecond),
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.Unavailable,
	codes.DeadlineExceeded,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 5000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	ImportCompletionData: []gax.CallOption{
	gax.WithTimeout(5000 * time.Millisecond),
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.Unavailable,
	codes.DeadlineExceeded,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 5000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	GetOperation: []gax.CallOption{},
	ListOperations: []gax.CallOption{
	gax.WithTimeout(300000 * time.Millisecond),
	gax.WithRetry(func() gax.Retryer {
	return gax.OnCodes([]codes.Code{
	codes.Unavailable,
	codes.DeadlineExceeded,
	}, gax.Backoff{
	Initial: 100 * time.Millisecond,
	Max: 300000 * time.Millisecond,
	Multiplier: 1.30,
	})
	}),
	},
	}
	}

	// internalCompletionClient is an interface that defines the methods available from Retail API.
	type internalCompletionClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	CompleteQuery(context.Context, retailpb.CompleteQueryRequest, ...gax.CallOption) (retailpb.CompleteQueryResponse, error)
	ImportCompletionData(context.Context, retailpb.ImportCompletionDataRequest, ...gax.CallOption) (ImportCompletionDataOperation, error)
	ImportCompletionDataOperation(name string) *ImportCompletionDataOperation
	GetOperation(context.Context, longrunningpb.GetOperationRequest, ...gax.CallOption) (longrunningpb.Operation, error)
	ListOperations(context.Context, longrunningpb.ListOperationsRequest, ...gax.CallOption) OperationIterator
	}

	// CompletionClient is a client for interacting with Retail API.
	// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
	//
	// Autocomplete service for retail.
	//
	// This feature is only available for users who have Retail Search enabled.
	// Enable Retail Search on Cloud Console before using this feature.
	type CompletionClient struct {
	// The internal transport-dependent client.
	internalClient internalCompletionClient

	// The call options for this service.
	CallOptions *CompletionCallOptions

	// LROClient is used internally to handle long-running operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient *lroauto.OperationsClient
	}

	// Wrapper methods routed to the internal client.

	// Close closes the connection to the API service. The user should invoke this when
	// the client is no longer required.
	func (c *CompletionClient) Close() error {
	return c.internalClient.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 *CompletionClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
	}

	// Connection returns a connection to the API service.
	//
	// Deprecated: Connections are now pooled so this method does not always
	// return the same resource.
	func (c CompletionClient) Connection() grpc.ClientConn {
	return c.internalClient.Connection()
	}

	// CompleteQuery completes the specified prefix with keyword suggestions.
	//
	// This feature is only available for users who have Retail Search enabled.
	// Enable Retail Search on Cloud Console before using this feature.
	func (c CompletionClient) CompleteQuery(ctx context.Context, req retailpb.CompleteQueryRequest, opts ...gax.CallOption) (*retailpb.CompleteQueryResponse, error) {
	return c.internalClient.CompleteQuery(ctx, req, opts...)
	}

	// ImportCompletionData bulk import of processed completion dataset.
	//
	// Request processing is asynchronous. Partial updating is not supported.
	//
	// The operation is successfully finished only after the imported suggestions
	// are indexed successfully and ready for serving. The process takes hours.
	//
	// This feature is only available for users who have Retail Search enabled.
	// Enable Retail Search on Cloud Console before using this feature.
	func (c CompletionClient) ImportCompletionData(ctx context.Context, req retailpb.ImportCompletionDataRequest, opts ...gax.CallOption) (*ImportCompletionDataOperation, error) {
	return c.internalClient.ImportCompletionData(ctx, req, opts...)
	}

	// ImportCompletionDataOperation returns a new ImportCompletionDataOperation from a given name.
	// The name must be that of a previously created ImportCompletionDataOperation, possibly from a different process.
	func (c CompletionClient) ImportCompletionDataOperation(name string) ImportCompletionDataOperation {
	return c.internalClient.ImportCompletionDataOperation(name)
	}

	// GetOperation is a utility method from google.longrunning.Operations.
	func (c CompletionClient) GetOperation(ctx context.Context, req longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	return c.internalClient.GetOperation(ctx, req, opts...)
	}

	// ListOperations is a utility method from google.longrunning.Operations.
	func (c CompletionClient) ListOperations(ctx context.Context, req longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	return c.internalClient.ListOperations(ctx, req, opts...)
	}

	// completionGRPCClient is a client for interacting with Retail API over gRPC transport.
	//
	// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
	type completionGRPCClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// Points back to the CallOptions field of the containing CompletionClient
	CallOptions **CompletionCallOptions

	// The gRPC API client.
	completionClient retailpb.CompletionServiceClient

	// LROClient is used internally to handle long-running operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient **lroauto.OperationsClient

	operationsClient longrunningpb.OperationsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogHeaders []string
	}

	// NewCompletionClient creates a new completion service client based on gRPC.
	// The returned client must be Closed when it is done being used to clean up its underlying connections.
	//
	// Autocomplete service for retail.
	//
	// This feature is only available for users who have Retail Search enabled.
	// Enable Retail Search on Cloud Console before using this feature.
	func NewCompletionClient(ctx context.Context, opts ...option.ClientOption) (*CompletionClient, error) {
	clientOpts := defaultCompletionGRPCClientOptions()
	if newCompletionClientHook != nil {
	hookOpts, err := newCompletionClientHook(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
	}
	client := CompletionClient{CallOptions: defaultCompletionCallOptions()}

	c := &completionGRPCClient{
	connPool: connPool,
	completionClient: retailpb.NewCompletionServiceClient(connPool),
	CallOptions: &client.CallOptions,
	operationsClient: longrunningpb.NewOperationsClient(connPool),
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	client.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
	if err != nil {
	// This error "should not happen", since we are just reusing old connection pool
	// and never actually need to dial.
	// If this does happen, we could leak connp. However, we cannot close conn:
	// If the user invoked the constructor with option.WithGRPCConn,
	// we would close a connection that's still in use.
	// TODO: investigate error conditions.
	return nil, err
	}
	c.LROClient = &client.LROClient
	return &client, nil
	}

	// Connection returns a connection to the API service.
	//
	// Deprecated: Connections are now pooled so this method does not always
	// return the same resource.
	func (c completionGRPCClient) Connection() grpc.ClientConn {
	return c.connPool.Conn()
	}

	// 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 *completionGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
	}

	// Close closes the connection to the API service. The user should invoke this when
	// the client is no longer required.
	func (c *completionGRPCClient) Close() error {
	return c.connPool.Close()
	}

	func (c completionGRPCClient) CompleteQuery(ctx context.Context, req retailpb.CompleteQueryRequest, opts ...gax.CallOption) (*retailpb.CompleteQueryResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "catalog", url.QueryEscape(req.GetCatalog()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((c.CallOptions).CompleteQuery[0:len((c.CallOptions).CompleteQuery):len((*c.CallOptions).CompleteQuery)], opts...)
	var resp *retailpb.CompleteQueryResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.completionClient.CompleteQuery(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	func (c completionGRPCClient) ImportCompletionData(ctx context.Context, req retailpb.ImportCompletionDataRequest, opts ...gax.CallOption) (*ImportCompletionDataOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((c.CallOptions).ImportCompletionData[0:len((c.CallOptions).ImportCompletionData):len((*c.CallOptions).ImportCompletionData)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.completionClient.ImportCompletionData(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return &ImportCompletionDataOperation{
	lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
	}

	func (c completionGRPCClient) GetOperation(ctx context.Context, req longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((c.CallOptions).GetOperation[0:len((c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.operationsClient.GetOperation(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, err
	}
	return resp, nil
	}

	func (c completionGRPCClient) ListOperations(ctx context.Context, req longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((c.CallOptions).ListOperations[0:len((c.CallOptions).ListOperations):len((*c.CallOptions).ListOperations)], opts...)
	it := &OperationIterator{}
	req = proto.Clone(req).(*longrunningpb.ListOperationsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
	resp := &longrunningpb.ListOperationsResponse{}
	if pageToken != "" {
	req.PageToken = pageToken
	}
	if pageSize > math.MaxInt32 {
	req.PageSize = math.MaxInt32
	} else if pageSize != 0 {
	req.PageSize = int32(pageSize)
	}
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	var err error
	resp, err = c.operationsClient.ListOperations(ctx, req, settings.GRPC...)
	return err
	}, opts...)
	if err != nil {
	return nil, "", err
	}

	it.Response = resp
	return resp.GetOperations(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
	items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
	if err != nil {
	return "", err
	}
	it.items = append(it.items, items...)
	return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
	}

	// ImportCompletionDataOperation returns a new ImportCompletionDataOperation from a given name.
	// The name must be that of a previously created ImportCompletionDataOperation, possibly from a different process.
	func (c completionGRPCClient) ImportCompletionDataOperation(name string) ImportCompletionDataOperation {
	return &ImportCompletionDataOperation{
	lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
	}