retail/apiv2alpha/serving_config_client.go

// Copyright 2022 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 (
	"bytes"
	"context"
	"fmt"
	"io/ioutil"
	"math"
	"net/http"
	"net/url"
	"time"

	retailpb "cloud.google.com/go/retail/apiv2alpha/retailpb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/googleapi"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	httptransport "google.golang.org/api/transport/http"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

var newServingConfigClientHook clientHook

// ServingConfigCallOptions contains the retry settings for each method of ServingConfigClient.
type ServingConfigCallOptions struct {
	CreateServingConfig []gax.CallOption
	DeleteServingConfig []gax.CallOption
	UpdateServingConfig []gax.CallOption
	GetServingConfig    []gax.CallOption
	ListServingConfigs  []gax.CallOption
	AddControl          []gax.CallOption
	RemoveControl       []gax.CallOption
	GetOperation        []gax.CallOption
	ListOperations      []gax.CallOption
}

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

func defaultServingConfigCallOptions() *ServingConfigCallOptions {
	return &ServingConfigCallOptions{
		CreateServingConfig: []gax.CallOption{},
		DeleteServingConfig: []gax.CallOption{},
		UpdateServingConfig: []gax.CallOption{},
		GetServingConfig:    []gax.CallOption{},
		ListServingConfigs:  []gax.CallOption{},
		AddControl:          []gax.CallOption{},
		RemoveControl:       []gax.CallOption{},
		GetOperation:        []gax.CallOption{},
		ListOperations: []gax.CallOption{
			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,
				})
			}),
		},
	}
}

func defaultServingConfigRESTCallOptions() *ServingConfigCallOptions {
	return &ServingConfigCallOptions{
		CreateServingConfig: []gax.CallOption{},
		DeleteServingConfig: []gax.CallOption{},
		UpdateServingConfig: []gax.CallOption{},
		GetServingConfig:    []gax.CallOption{},
		ListServingConfigs:  []gax.CallOption{},
		AddControl:          []gax.CallOption{},
		RemoveControl:       []gax.CallOption{},
		GetOperation:        []gax.CallOption{},
		ListOperations: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        300000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable,
					http.StatusGatewayTimeout)
			}),
		},
	}
}

// internalServingConfigClient is an interface that defines the methods available from Retail API.
type internalServingConfigClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	CreateServingConfig(context.Context, *retailpb.CreateServingConfigRequest, ...gax.CallOption) (*retailpb.ServingConfig, error)
	DeleteServingConfig(context.Context, *retailpb.DeleteServingConfigRequest, ...gax.CallOption) error
	UpdateServingConfig(context.Context, *retailpb.UpdateServingConfigRequest, ...gax.CallOption) (*retailpb.ServingConfig, error)
	GetServingConfig(context.Context, *retailpb.GetServingConfigRequest, ...gax.CallOption) (*retailpb.ServingConfig, error)
	ListServingConfigs(context.Context, *retailpb.ListServingConfigsRequest, ...gax.CallOption) *ServingConfigIterator
	AddControl(context.Context, *retailpb.AddControlRequest, ...gax.CallOption) (*retailpb.ServingConfig, error)
	RemoveControl(context.Context, *retailpb.RemoveControlRequest, ...gax.CallOption) (*retailpb.ServingConfig, error)
	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
}

// ServingConfigClient 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.
//
// Service for modifying ServingConfig.
type ServingConfigClient struct {
	// The internal transport-dependent client.
	internalClient internalServingConfigClient

	// The call options for this service.
	CallOptions *ServingConfigCallOptions
}

// 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 *ServingConfigClient) 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 *ServingConfigClient) 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 *ServingConfigClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// CreateServingConfig creates a ServingConfig.
//
// A maximum of 100
// ServingConfigs are allowed in
// a Catalog, otherwise a
// FAILED_PRECONDITION error is returned.
func (c *ServingConfigClient) CreateServingConfig(ctx context.Context, req *retailpb.CreateServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	return c.internalClient.CreateServingConfig(ctx, req, opts...)
}

// DeleteServingConfig deletes a ServingConfig.
//
// Returns a NotFound error if the ServingConfig does not exist.
func (c *ServingConfigClient) DeleteServingConfig(ctx context.Context, req *retailpb.DeleteServingConfigRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteServingConfig(ctx, req, opts...)
}

// UpdateServingConfig updates a ServingConfig.
func (c *ServingConfigClient) UpdateServingConfig(ctx context.Context, req *retailpb.UpdateServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	return c.internalClient.UpdateServingConfig(ctx, req, opts...)
}

// GetServingConfig gets a ServingConfig.
//
// Returns a NotFound error if the ServingConfig does not exist.
func (c *ServingConfigClient) GetServingConfig(ctx context.Context, req *retailpb.GetServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	return c.internalClient.GetServingConfig(ctx, req, opts...)
}

// ListServingConfigs lists all ServingConfigs linked to this catalog.
func (c *ServingConfigClient) ListServingConfigs(ctx context.Context, req *retailpb.ListServingConfigsRequest, opts ...gax.CallOption) *ServingConfigIterator {
	return c.internalClient.ListServingConfigs(ctx, req, opts...)
}

// AddControl enables a Control on the specified ServingConfig.
// The control is added in the last position of the list of controls
// it belongs to (e.g. if it’s a facet spec control it will be applied
// in the last position of servingConfig.facetSpecIds)
// Returns a ALREADY_EXISTS error if the control has already been applied.
// Returns a FAILED_PRECONDITION error if the addition could exceed maximum
// number of control allowed for that type of control.
func (c *ServingConfigClient) AddControl(ctx context.Context, req *retailpb.AddControlRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	return c.internalClient.AddControl(ctx, req, opts...)
}

// RemoveControl disables a Control on the specified ServingConfig.
// The control is removed from the ServingConfig.
// Returns a NOT_FOUND error if the Control is not enabled for the
// ServingConfig.
func (c *ServingConfigClient) RemoveControl(ctx context.Context, req *retailpb.RemoveControlRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	return c.internalClient.RemoveControl(ctx, req, opts...)
}

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

// servingConfigGRPCClient 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 servingConfigGRPCClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// flag to opt out of default deadlines via GOOGLE_API_GO_EXPERIMENTAL_DISABLE_DEFAULT_DEADLINE
	disableDeadlines bool

	// Points back to the CallOptions field of the containing ServingConfigClient
	CallOptions **ServingConfigCallOptions

	// The gRPC API client.
	servingConfigClient retailpb.ServingConfigServiceClient

	operationsClient longrunningpb.OperationsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD
}

// NewServingConfigClient creates a new serving config service client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// Service for modifying ServingConfig.
func NewServingConfigClient(ctx context.Context, opts ...option.ClientOption) (*ServingConfigClient, error) {
	clientOpts := defaultServingConfigGRPCClientOptions()
	if newServingConfigClientHook != nil {
		hookOpts, err := newServingConfigClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	disableDeadlines, err := checkDisableDeadlines()
	if err != nil {
		return nil, err
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	client := ServingConfigClient{CallOptions: defaultServingConfigCallOptions()}

	c := &servingConfigGRPCClient{
		connPool:            connPool,
		disableDeadlines:    disableDeadlines,
		servingConfigClient: retailpb.NewServingConfigServiceClient(connPool),
		CallOptions:         &client.CallOptions,
		operationsClient:    longrunningpb.NewOperationsClient(connPool),
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	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 *servingConfigGRPCClient) 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 *servingConfigGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("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 *servingConfigGRPCClient) Close() error {
	return c.connPool.Close()
}

// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type servingConfigRESTClient struct {
	// The http endpoint to connect to.
	endpoint string

	// The http client.
	httpClient *http.Client

	// The x-goog-* metadata to be sent with each request.
	xGoogMetadata metadata.MD

	// Points back to the CallOptions field of the containing ServingConfigClient
	CallOptions **ServingConfigCallOptions
}

// NewServingConfigRESTClient creates a new serving config service rest client.
//
// Service for modifying ServingConfig.
func NewServingConfigRESTClient(ctx context.Context, opts ...option.ClientOption) (*ServingConfigClient, error) {
	clientOpts := append(defaultServingConfigRESTClientOptions(), opts...)
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
		return nil, err
	}

	callOpts := defaultServingConfigRESTCallOptions()
	c := &servingConfigRESTClient{
		endpoint:    endpoint,
		httpClient:  httpClient,
		CallOptions: &callOpts,
	}
	c.setGoogleClientInfo()

	return &ServingConfigClient{internalClient: c, CallOptions: callOpts}, nil
}

func defaultServingConfigRESTClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("https://retail.googleapis.com"),
		internaloption.WithDefaultMTLSEndpoint("https://retail.mtls.googleapis.com"),
		internaloption.WithDefaultAudience("https://retail.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
	}
}

// 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 *servingConfigRESTClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", versionGo()}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN")
	c.xGoogMetadata = metadata.Pairs("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 *servingConfigRESTClient) Close() error {
	// Replace httpClient with nil to force cleanup.
	c.httpClient = nil
	return nil
}

// Connection returns a connection to the API service.
//
// Deprecated: This method always returns nil.
func (c *servingConfigRESTClient) Connection() *grpc.ClientConn {
	return nil
}
func (c *servingConfigGRPCClient) CreateServingConfig(ctx context.Context, req *retailpb.CreateServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).CreateServingConfig[0:len((*c.CallOptions).CreateServingConfig):len((*c.CallOptions).CreateServingConfig)], opts...)
	var resp *retailpb.ServingConfig
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.servingConfigClient.CreateServingConfig(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *servingConfigGRPCClient) DeleteServingConfig(ctx context.Context, req *retailpb.DeleteServingConfigRequest, opts ...gax.CallOption) 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).DeleteServingConfig[0:len((*c.CallOptions).DeleteServingConfig):len((*c.CallOptions).DeleteServingConfig)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.servingConfigClient.DeleteServingConfig(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *servingConfigGRPCClient) UpdateServingConfig(ctx context.Context, req *retailpb.UpdateServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "serving_config.name", url.QueryEscape(req.GetServingConfig().GetName())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).UpdateServingConfig[0:len((*c.CallOptions).UpdateServingConfig):len((*c.CallOptions).UpdateServingConfig)], opts...)
	var resp *retailpb.ServingConfig
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.servingConfigClient.UpdateServingConfig(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *servingConfigGRPCClient) GetServingConfig(ctx context.Context, req *retailpb.GetServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, 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).GetServingConfig[0:len((*c.CallOptions).GetServingConfig):len((*c.CallOptions).GetServingConfig)], opts...)
	var resp *retailpb.ServingConfig
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.servingConfigClient.GetServingConfig(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *servingConfigGRPCClient) ListServingConfigs(ctx context.Context, req *retailpb.ListServingConfigsRequest, opts ...gax.CallOption) *ServingConfigIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).ListServingConfigs[0:len((*c.CallOptions).ListServingConfigs):len((*c.CallOptions).ListServingConfigs)], opts...)
	it := &ServingConfigIterator{}
	req = proto.Clone(req).(*retailpb.ListServingConfigsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*retailpb.ServingConfig, string, error) {
		resp := &retailpb.ListServingConfigsResponse{}
		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.servingConfigClient.ListServingConfigs(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetServingConfigs(), 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
}

func (c *servingConfigGRPCClient) AddControl(ctx context.Context, req *retailpb.AddControlRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "serving_config", url.QueryEscape(req.GetServingConfig())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).AddControl[0:len((*c.CallOptions).AddControl):len((*c.CallOptions).AddControl)], opts...)
	var resp *retailpb.ServingConfig
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.servingConfigClient.AddControl(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *servingConfigGRPCClient) RemoveControl(ctx context.Context, req *retailpb.RemoveControlRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "serving_config", url.QueryEscape(req.GetServingConfig())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).RemoveControl[0:len((*c.CallOptions).RemoveControl):len((*c.CallOptions).RemoveControl)], opts...)
	var resp *retailpb.ServingConfig
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.servingConfigClient.RemoveControl(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *servingConfigGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, 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).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 *servingConfigGRPCClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	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).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
}

// CreateServingConfig creates a ServingConfig.
//
// A maximum of 100
// ServingConfigs are allowed in
// a Catalog, otherwise a
// FAILED_PRECONDITION error is returned.
func (c *servingConfigRESTClient) CreateServingConfig(ctx context.Context, req *retailpb.CreateServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetServingConfig()
	jsonReq, err := m.Marshal(body)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v/servingConfigs", req.GetParent())

	params := url.Values{}
	params.Add("servingConfigId", fmt.Sprintf("%v", req.GetServingConfigId()))

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).CreateServingConfig[0:len((*c.CallOptions).CreateServingConfig):len((*c.CallOptions).CreateServingConfig)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.ServingConfig{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := ioutil.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return maybeUnknownEnum(err)
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// DeleteServingConfig deletes a ServingConfig.
//
// Returns a NotFound error if the ServingConfig does not exist.
func (c *servingConfigRESTClient) DeleteServingConfig(ctx context.Context, req *retailpb.DeleteServingConfigRequest, opts ...gax.CallOption) error {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetName())

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	return gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("DELETE", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		// Returns nil if there is no error, otherwise wraps
		// the response code and body into a non-nil error
		return googleapi.CheckResponse(httpRsp)
	}, opts...)
}

// UpdateServingConfig updates a ServingConfig.
func (c *servingConfigRESTClient) UpdateServingConfig(ctx context.Context, req *retailpb.UpdateServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetServingConfig()
	jsonReq, err := m.Marshal(body)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetServingConfig().GetName())

	params := url.Values{}
	if req.GetUpdateMask() != nil {
		updateMask, err := protojson.Marshal(req.GetUpdateMask())
		if err != nil {
			return nil, err
		}
		params.Add("updateMask", string(updateMask))
	}

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "serving_config.name", url.QueryEscape(req.GetServingConfig().GetName())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).UpdateServingConfig[0:len((*c.CallOptions).UpdateServingConfig):len((*c.CallOptions).UpdateServingConfig)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.ServingConfig{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("PATCH", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := ioutil.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return maybeUnknownEnum(err)
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// GetServingConfig gets a ServingConfig.
//
// Returns a NotFound error if the ServingConfig does not exist.
func (c *servingConfigRESTClient) GetServingConfig(ctx context.Context, req *retailpb.GetServingConfigRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetName())

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).GetServingConfig[0:len((*c.CallOptions).GetServingConfig):len((*c.CallOptions).GetServingConfig)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.ServingConfig{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := ioutil.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return maybeUnknownEnum(err)
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// ListServingConfigs lists all ServingConfigs linked to this catalog.
func (c *servingConfigRESTClient) ListServingConfigs(ctx context.Context, req *retailpb.ListServingConfigsRequest, opts ...gax.CallOption) *ServingConfigIterator {
	it := &ServingConfigIterator{}
	req = proto.Clone(req).(*retailpb.ListServingConfigsRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*retailpb.ServingConfig, string, error) {
		resp := &retailpb.ListServingConfigsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v2alpha/%v/servingConfigs", req.GetParent())

		params := url.Values{}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		headers := buildHeaders(ctx, c.xGoogMetadata, metadata.Pairs("Content-Type", "application/json"))
		e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			if settings.Path != "" {
				baseUrl.Path = settings.Path
			}
			httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
			if err != nil {
				return err
			}
			httpReq.Header = headers

			httpRsp, err := c.httpClient.Do(httpReq)
			if err != nil {
				return err
			}
			defer httpRsp.Body.Close()

			if err = googleapi.CheckResponse(httpRsp); err != nil {
				return err
			}

			buf, err := ioutil.ReadAll(httpRsp.Body)
			if err != nil {
				return err
			}

			if err := unm.Unmarshal(buf, resp); err != nil {
				return maybeUnknownEnum(err)
			}

			return nil
		}, opts...)
		if e != nil {
			return nil, "", e
		}
		it.Response = resp
		return resp.GetServingConfigs(), 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
}

// AddControl enables a Control on the specified ServingConfig.
// The control is added in the last position of the list of controls
// it belongs to (e.g. if it’s a facet spec control it will be applied
// in the last position of servingConfig.facetSpecIds)
// Returns a ALREADY_EXISTS error if the control has already been applied.
// Returns a FAILED_PRECONDITION error if the addition could exceed maximum
// number of control allowed for that type of control.
func (c *servingConfigRESTClient) AddControl(ctx context.Context, req *retailpb.AddControlRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v:addControl", req.GetServingConfig())

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "serving_config", url.QueryEscape(req.GetServingConfig())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).AddControl[0:len((*c.CallOptions).AddControl):len((*c.CallOptions).AddControl)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.ServingConfig{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := ioutil.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return maybeUnknownEnum(err)
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// RemoveControl disables a Control on the specified ServingConfig.
// The control is removed from the ServingConfig.
// Returns a NOT_FOUND error if the Control is not enabled for the
// ServingConfig.
func (c *servingConfigRESTClient) RemoveControl(ctx context.Context, req *retailpb.RemoveControlRequest, opts ...gax.CallOption) (*retailpb.ServingConfig, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v:removeControl", req.GetServingConfig())

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "serving_config", url.QueryEscape(req.GetServingConfig())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).RemoveControl[0:len((*c.CallOptions).RemoveControl):len((*c.CallOptions).RemoveControl)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &retailpb.ServingConfig{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := ioutil.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return maybeUnknownEnum(err)
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// GetOperation is a utility method from google.longrunning.Operations.
func (c *servingConfigRESTClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v2alpha/%v", req.GetName())

	// Build HTTP headers from client and context metadata.
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		httpRsp, err := c.httpClient.Do(httpReq)
		if err != nil {
			return err
		}
		defer httpRsp.Body.Close()

		if err = googleapi.CheckResponse(httpRsp); err != nil {
			return err
		}

		buf, err := ioutil.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

		if err := unm.Unmarshal(buf, resp); err != nil {
			return maybeUnknownEnum(err)
		}

		return nil
	}, opts...)
	if e != nil {
		return nil, e
	}
	return resp, nil
}

// ListOperations is a utility method from google.longrunning.Operations.
func (c *servingConfigRESTClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	it := &OperationIterator{}
	req = proto.Clone(req).(*longrunningpb.ListOperationsRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	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)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v2alpha/%v/operations", req.GetName())

		params := url.Values{}
		if req.GetFilter() != "" {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		headers := buildHeaders(ctx, c.xGoogMetadata, metadata.Pairs("Content-Type", "application/json"))
		e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			if settings.Path != "" {
				baseUrl.Path = settings.Path
			}
			httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
			if err != nil {
				return err
			}
			httpReq.Header = headers

			httpRsp, err := c.httpClient.Do(httpReq)
			if err != nil {
				return err
			}
			defer httpRsp.Body.Close()

			if err = googleapi.CheckResponse(httpRsp); err != nil {
				return err
			}

			buf, err := ioutil.ReadAll(httpRsp.Body)
			if err != nil {
				return err
			}

			if err := unm.Unmarshal(buf, resp); err != nil {
				return maybeUnknownEnum(err)
			}

			return nil
		}, opts...)
		if e != nil {
			return nil, "", e
		}
		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
}

// ServingConfigIterator manages a stream of *retailpb.ServingConfig.
type ServingConfigIterator struct {
	items    []*retailpb.ServingConfig
	pageInfo *iterator.PageInfo
	nextFunc func() error

	// Response is the raw response for the current page.
	// It must be cast to the RPC response type.
	// Calling Next() or InternalFetch() updates this value.
	Response interface{}

	// InternalFetch is for use by the Google Cloud Libraries only.
	// It is not part of the stable interface of this package.
	//
	// InternalFetch returns results from a single call to the underlying RPC.
	// The number of results is no greater than pageSize.
	// If there are no more results, nextPageToken is empty and err is nil.
	InternalFetch func(pageSize int, pageToken string) (results []*retailpb.ServingConfig, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *ServingConfigIterator) PageInfo() *iterator.PageInfo {
	return it.pageInfo
}

// Next returns the next result. Its second return value is iterator.Done if there are no more
// results. Once Next returns Done, all subsequent calls will return Done.
func (it *ServingConfigIterator) Next() (*retailpb.ServingConfig, error) {
	var item *retailpb.ServingConfig
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

func (it *ServingConfigIterator) bufLen() int {
	return len(it.items)
}

func (it *ServingConfigIterator) takeBuf() interface{} {
	b := it.items
	it.items = nil
	return b
}