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

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	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"
	retailpb "google.golang.org/genproto/googleapis/cloud/retail/v2beta"
	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/proto"
)

var newProductClientHook clientHook

// ProductCallOptions contains the retry settings for each method of ProductClient.
type ProductCallOptions struct {
	CreateProduct           []gax.CallOption
	GetProduct              []gax.CallOption
	ListProducts            []gax.CallOption
	UpdateProduct           []gax.CallOption
	DeleteProduct           []gax.CallOption
	ImportProducts          []gax.CallOption
	SetInventory            []gax.CallOption
	AddFulfillmentPlaces    []gax.CallOption
	RemoveFulfillmentPlaces []gax.CallOption
	AddLocalInventories     []gax.CallOption
	RemoveLocalInventories  []gax.CallOption
}

func defaultProductGRPCClientOptions() []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 defaultProductCallOptions() *ProductCallOptions {
	return &ProductCallOptions{
		CreateProduct: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetProduct: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListProducts: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		UpdateProduct: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		DeleteProduct: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ImportProducts: []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,
				})
			}),
		},
		SetInventory: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		AddFulfillmentPlaces: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		RemoveFulfillmentPlaces: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		AddLocalInventories: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		RemoveLocalInventories: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
					codes.DeadlineExceeded,
				}, gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

// internalProductClient is an interface that defines the methods availaible from Retail API.
type internalProductClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	CreateProduct(context.Context, *retailpb.CreateProductRequest, ...gax.CallOption) (*retailpb.Product, error)
	GetProduct(context.Context, *retailpb.GetProductRequest, ...gax.CallOption) (*retailpb.Product, error)
	ListProducts(context.Context, *retailpb.ListProductsRequest, ...gax.CallOption) *ProductIterator
	UpdateProduct(context.Context, *retailpb.UpdateProductRequest, ...gax.CallOption) (*retailpb.Product, error)
	DeleteProduct(context.Context, *retailpb.DeleteProductRequest, ...gax.CallOption) error
	ImportProducts(context.Context, *retailpb.ImportProductsRequest, ...gax.CallOption) (*ImportProductsOperation, error)
	ImportProductsOperation(name string) *ImportProductsOperation
	SetInventory(context.Context, *retailpb.SetInventoryRequest, ...gax.CallOption) (*SetInventoryOperation, error)
	SetInventoryOperation(name string) *SetInventoryOperation
	AddFulfillmentPlaces(context.Context, *retailpb.AddFulfillmentPlacesRequest, ...gax.CallOption) (*AddFulfillmentPlacesOperation, error)
	AddFulfillmentPlacesOperation(name string) *AddFulfillmentPlacesOperation
	RemoveFulfillmentPlaces(context.Context, *retailpb.RemoveFulfillmentPlacesRequest, ...gax.CallOption) (*RemoveFulfillmentPlacesOperation, error)
	RemoveFulfillmentPlacesOperation(name string) *RemoveFulfillmentPlacesOperation
	AddLocalInventories(context.Context, *retailpb.AddLocalInventoriesRequest, ...gax.CallOption) (*AddLocalInventoriesOperation, error)
	AddLocalInventoriesOperation(name string) *AddLocalInventoriesOperation
	RemoveLocalInventories(context.Context, *retailpb.RemoveLocalInventoriesRequest, ...gax.CallOption) (*RemoveLocalInventoriesOperation, error)
	RemoveLocalInventoriesOperation(name string) *RemoveLocalInventoriesOperation
}

// ProductClient 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 ingesting Product
// information of the customer’s website.
type ProductClient struct {
	// The internal transport-dependent client.
	internalClient internalProductClient

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

	// 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 *ProductClient) 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 *ProductClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
}

// Connection returns a connection to the API service.
//
// Deprecated.
func (c *ProductClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// CreateProduct creates a Product.
func (c *ProductClient) CreateProduct(ctx context.Context, req *retailpb.CreateProductRequest, opts ...gax.CallOption) (*retailpb.Product, error) {
	return c.internalClient.CreateProduct(ctx, req, opts...)
}

// GetProduct gets a Product.
func (c *ProductClient) GetProduct(ctx context.Context, req *retailpb.GetProductRequest, opts ...gax.CallOption) (*retailpb.Product, error) {
	return c.internalClient.GetProduct(ctx, req, opts...)
}

// ListProducts gets a list of Products.
func (c *ProductClient) ListProducts(ctx context.Context, req *retailpb.ListProductsRequest, opts ...gax.CallOption) *ProductIterator {
	return c.internalClient.ListProducts(ctx, req, opts...)
}

// UpdateProduct updates a Product.
func (c *ProductClient) UpdateProduct(ctx context.Context, req *retailpb.UpdateProductRequest, opts ...gax.CallOption) (*retailpb.Product, error) {
	return c.internalClient.UpdateProduct(ctx, req, opts...)
}

// DeleteProduct deletes a Product.
func (c *ProductClient) DeleteProduct(ctx context.Context, req *retailpb.DeleteProductRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteProduct(ctx, req, opts...)
}

// ImportProducts bulk import of multiple Products.
//
// Request processing may be synchronous. No partial updating is supported.
// Non-existing items are created.
//
// Note that it is possible for a subset of the
// Products to be successfully updated.
func (c *ProductClient) ImportProducts(ctx context.Context, req *retailpb.ImportProductsRequest, opts ...gax.CallOption) (*ImportProductsOperation, error) {
	return c.internalClient.ImportProducts(ctx, req, opts...)
}

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

// SetInventory updates inventory information for a
// Product while respecting the last
// update timestamps of each inventory field.
//
// This process is asynchronous and does not require the
// Product to exist before updating
// fulfillment information. If the request is valid, the update will be
// enqueued and processed downstream. As a consequence, when a response is
// returned, updates are not immediately manifested in the
// Product queried by
// GetProduct or
// ListProducts.
//
// When inventory is updated with
// CreateProduct
// and
// UpdateProduct,
// the specified inventory field value(s) will overwrite any existing value(s)
// while ignoring the last update time for this field. Furthermore, the last
// update time for the specified inventory fields will be overwritten to the
// time of the
// CreateProduct or
// UpdateProduct
// request.
//
// If no inventory fields are set in
// CreateProductRequest.product,
// then any pre-existing inventory information for this product will be used.
//
// If no inventory fields are set in
// SetInventoryRequest.set_mask,
// then any existing inventory information will be preserved.
//
// Pre-existing inventory information can only be updated with
// SetInventory,
// AddFulfillmentPlaces,
// and
// RemoveFulfillmentPlaces.
//
// This feature is only available for users who have Retail Search enabled.
// Please enable Retail Search on Cloud Console before using this feature.
func (c *ProductClient) SetInventory(ctx context.Context, req *retailpb.SetInventoryRequest, opts ...gax.CallOption) (*SetInventoryOperation, error) {
	return c.internalClient.SetInventory(ctx, req, opts...)
}

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

// AddFulfillmentPlaces incrementally adds place IDs to
// Product.fulfillment_info.place_ids.
//
// This process is asynchronous and does not require the
// Product to exist before updating
// fulfillment information. If the request is valid, the update will be
// enqueued and processed downstream. As a consequence, when a response is
// returned, the added place IDs are not immediately manifested in the
// Product queried by
// GetProduct or
// ListProducts.
//
// This feature is only available for users who have Retail Search enabled.
// Please enable Retail Search on Cloud Console before using this feature.
func (c *ProductClient) AddFulfillmentPlaces(ctx context.Context, req *retailpb.AddFulfillmentPlacesRequest, opts ...gax.CallOption) (*AddFulfillmentPlacesOperation, error) {
	return c.internalClient.AddFulfillmentPlaces(ctx, req, opts...)
}

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

// RemoveFulfillmentPlaces incrementally removes place IDs from a
// Product.fulfillment_info.place_ids.
//
// This process is asynchronous and does not require the
// Product to exist before updating
// fulfillment information. If the request is valid, the update will be
// enqueued and processed downstream. As a consequence, when a response is
// returned, the removed place IDs are not immediately manifested in the
// Product queried by
// GetProduct or
// ListProducts.
//
// This feature is only available for users who have Retail Search enabled.
// Please enable Retail Search on Cloud Console before using this feature.
func (c *ProductClient) RemoveFulfillmentPlaces(ctx context.Context, req *retailpb.RemoveFulfillmentPlacesRequest, opts ...gax.CallOption) (*RemoveFulfillmentPlacesOperation, error) {
	return c.internalClient.RemoveFulfillmentPlaces(ctx, req, opts...)
}

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

// AddLocalInventories updates local inventory information for a
// Product at a list of places, while
// respecting the last update timestamps of each inventory field.
//
// This process is asynchronous and does not require the
// Product to exist before updating
// inventory information. If the request is valid, the update will be enqueued
// and processed downstream. As a consequence, when a response is returned,
// updates are not immediately manifested in the
// Product queried by
// GetProduct or
// ListProducts.
//
// Local inventory information can only be modified using this method.
// CreateProduct
// and
// UpdateProduct
// has no effect on local inventories.
//
// This feature is only available for users who have Retail Search enabled.
// Please enable Retail Search on Cloud Console before using this feature.
func (c *ProductClient) AddLocalInventories(ctx context.Context, req *retailpb.AddLocalInventoriesRequest, opts ...gax.CallOption) (*AddLocalInventoriesOperation, error) {
	return c.internalClient.AddLocalInventories(ctx, req, opts...)
}

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

// RemoveLocalInventories remove local inventory information for a
// Product at a list of places at a
// removal timestamp.
//
// This process is asynchronous. If the request is valid, the removal will be
// enqueued and processed downstream. As a consequence, when a response is
// returned, removals are not immediately manifested in the
// Product queried by
// GetProduct or
// ListProducts.
//
// Local inventory information can only be removed using this method.
// CreateProduct
// and
// UpdateProduct
// has no effect on local inventories.
//
// This feature is only available for users who have Retail Search enabled.
// Please enable Retail Search on Cloud Console before using this feature.
func (c *ProductClient) RemoveLocalInventories(ctx context.Context, req *retailpb.RemoveLocalInventoriesRequest, opts ...gax.CallOption) (*RemoveLocalInventoriesOperation, error) {
	return c.internalClient.RemoveLocalInventories(ctx, req, opts...)
}

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

// productGRPCClient 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 productGRPCClient 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 ProductClient
	CallOptions **ProductCallOptions

	// The gRPC API client.
	productClient retailpb.ProductServiceClient

	// 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

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

// NewProductClient creates a new product 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 ingesting Product
// information of the customer’s website.
func NewProductClient(ctx context.Context, opts ...option.ClientOption) (*ProductClient, error) {
	clientOpts := defaultProductGRPCClientOptions()
	if newProductClientHook != nil {
		hookOpts, err := newProductClientHook(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 := ProductClient{CallOptions: defaultProductCallOptions()}

	c := &productGRPCClient{
		connPool:         connPool,
		disableDeadlines: disableDeadlines,
		productClient:    retailpb.NewProductServiceClient(connPool),
		CallOptions:      &client.CallOptions,
	}
	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.
func (c *productGRPCClient) 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 *productGRPCClient) 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 *productGRPCClient) Close() error {
	return c.connPool.Close()
}

func (c *productGRPCClient) CreateProduct(ctx context.Context, req *retailpb.CreateProductRequest, opts ...gax.CallOption) (*retailpb.Product, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	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).CreateProduct[0:len((*c.CallOptions).CreateProduct):len((*c.CallOptions).CreateProduct)], opts...)
	var resp *retailpb.Product
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.CreateProduct(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *productGRPCClient) GetProduct(ctx context.Context, req *retailpb.GetProductRequest, opts ...gax.CallOption) (*retailpb.Product, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	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).GetProduct[0:len((*c.CallOptions).GetProduct):len((*c.CallOptions).GetProduct)], opts...)
	var resp *retailpb.Product
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.GetProduct(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *productGRPCClient) ListProducts(ctx context.Context, req *retailpb.ListProductsRequest, opts ...gax.CallOption) *ProductIterator {
	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).ListProducts[0:len((*c.CallOptions).ListProducts):len((*c.CallOptions).ListProducts)], opts...)
	it := &ProductIterator{}
	req = proto.Clone(req).(*retailpb.ListProductsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*retailpb.Product, string, error) {
		resp := &retailpb.ListProductsResponse{}
		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.productClient.ListProducts(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetProducts(), 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 *productGRPCClient) UpdateProduct(ctx context.Context, req *retailpb.UpdateProductRequest, opts ...gax.CallOption) (*retailpb.Product, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "product.name", url.QueryEscape(req.GetProduct().GetName())))

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

func (c *productGRPCClient) DeleteProduct(ctx context.Context, req *retailpb.DeleteProductRequest, opts ...gax.CallOption) error {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	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).DeleteProduct[0:len((*c.CallOptions).DeleteProduct):len((*c.CallOptions).DeleteProduct)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.productClient.DeleteProduct(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *productGRPCClient) ImportProducts(ctx context.Context, req *retailpb.ImportProductsRequest, opts ...gax.CallOption) (*ImportProductsOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 300000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	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).ImportProducts[0:len((*c.CallOptions).ImportProducts):len((*c.CallOptions).ImportProducts)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.ImportProducts(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &ImportProductsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *productGRPCClient) SetInventory(ctx context.Context, req *retailpb.SetInventoryRequest, opts ...gax.CallOption) (*SetInventoryOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "inventory.name", url.QueryEscape(req.GetInventory().GetName())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).SetInventory[0:len((*c.CallOptions).SetInventory):len((*c.CallOptions).SetInventory)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.SetInventory(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &SetInventoryOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *productGRPCClient) AddFulfillmentPlaces(ctx context.Context, req *retailpb.AddFulfillmentPlacesRequest, opts ...gax.CallOption) (*AddFulfillmentPlacesOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "product", url.QueryEscape(req.GetProduct())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).AddFulfillmentPlaces[0:len((*c.CallOptions).AddFulfillmentPlaces):len((*c.CallOptions).AddFulfillmentPlaces)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.AddFulfillmentPlaces(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &AddFulfillmentPlacesOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *productGRPCClient) RemoveFulfillmentPlaces(ctx context.Context, req *retailpb.RemoveFulfillmentPlacesRequest, opts ...gax.CallOption) (*RemoveFulfillmentPlacesOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "product", url.QueryEscape(req.GetProduct())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).RemoveFulfillmentPlaces[0:len((*c.CallOptions).RemoveFulfillmentPlaces):len((*c.CallOptions).RemoveFulfillmentPlaces)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.RemoveFulfillmentPlaces(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &RemoveFulfillmentPlacesOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *productGRPCClient) AddLocalInventories(ctx context.Context, req *retailpb.AddLocalInventoriesRequest, opts ...gax.CallOption) (*AddLocalInventoriesOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "product", url.QueryEscape(req.GetProduct())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).AddLocalInventories[0:len((*c.CallOptions).AddLocalInventories):len((*c.CallOptions).AddLocalInventories)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.AddLocalInventories(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &AddLocalInventoriesOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *productGRPCClient) RemoveLocalInventories(ctx context.Context, req *retailpb.RemoveLocalInventoriesRequest, opts ...gax.CallOption) (*RemoveLocalInventoriesOperation, error) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 30000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "product", url.QueryEscape(req.GetProduct())))

	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).RemoveLocalInventories[0:len((*c.CallOptions).RemoveLocalInventories):len((*c.CallOptions).RemoveLocalInventories)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.productClient.RemoveLocalInventories(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &RemoveLocalInventoriesOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

// AddFulfillmentPlacesOperation manages a long-running operation from AddFulfillmentPlaces.
type AddFulfillmentPlacesOperation struct {
	lro *longrunning.Operation
}

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

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *AddFulfillmentPlacesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*retailpb.AddFulfillmentPlacesResponse, error) {
	var resp retailpb.AddFulfillmentPlacesResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *AddFulfillmentPlacesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*retailpb.AddFulfillmentPlacesResponse, error) {
	var resp retailpb.AddFulfillmentPlacesResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *AddFulfillmentPlacesOperation) Metadata() (*retailpb.AddFulfillmentPlacesMetadata, error) {
	var meta retailpb.AddFulfillmentPlacesMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *AddFulfillmentPlacesOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *AddFulfillmentPlacesOperation) Name() string {
	return op.lro.Name()
}

// AddLocalInventoriesOperation manages a long-running operation from AddLocalInventories.
type AddLocalInventoriesOperation struct {
	lro *longrunning.Operation
}

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

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *AddLocalInventoriesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*retailpb.AddLocalInventoriesResponse, error) {
	var resp retailpb.AddLocalInventoriesResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *AddLocalInventoriesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*retailpb.AddLocalInventoriesResponse, error) {
	var resp retailpb.AddLocalInventoriesResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *AddLocalInventoriesOperation) Metadata() (*retailpb.AddLocalInventoriesMetadata, error) {
	var meta retailpb.AddLocalInventoriesMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *AddLocalInventoriesOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *AddLocalInventoriesOperation) Name() string {
	return op.lro.Name()
}

// ImportProductsOperation manages a long-running operation from ImportProducts.
type ImportProductsOperation struct {
	lro *longrunning.Operation
}

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

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *ImportProductsOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*retailpb.ImportProductsResponse, error) {
	var resp retailpb.ImportProductsResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *ImportProductsOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*retailpb.ImportProductsResponse, error) {
	var resp retailpb.ImportProductsResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *ImportProductsOperation) Metadata() (*retailpb.ImportMetadata, error) {
	var meta retailpb.ImportMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *ImportProductsOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *ImportProductsOperation) Name() string {
	return op.lro.Name()
}

// RemoveFulfillmentPlacesOperation manages a long-running operation from RemoveFulfillmentPlaces.
type RemoveFulfillmentPlacesOperation struct {
	lro *longrunning.Operation
}

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

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *RemoveFulfillmentPlacesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*retailpb.RemoveFulfillmentPlacesResponse, error) {
	var resp retailpb.RemoveFulfillmentPlacesResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *RemoveFulfillmentPlacesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*retailpb.RemoveFulfillmentPlacesResponse, error) {
	var resp retailpb.RemoveFulfillmentPlacesResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *RemoveFulfillmentPlacesOperation) Metadata() (*retailpb.RemoveFulfillmentPlacesMetadata, error) {
	var meta retailpb.RemoveFulfillmentPlacesMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *RemoveFulfillmentPlacesOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *RemoveFulfillmentPlacesOperation) Name() string {
	return op.lro.Name()
}

// RemoveLocalInventoriesOperation manages a long-running operation from RemoveLocalInventories.
type RemoveLocalInventoriesOperation struct {
	lro *longrunning.Operation
}

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

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *RemoveLocalInventoriesOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*retailpb.RemoveLocalInventoriesResponse, error) {
	var resp retailpb.RemoveLocalInventoriesResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *RemoveLocalInventoriesOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*retailpb.RemoveLocalInventoriesResponse, error) {
	var resp retailpb.RemoveLocalInventoriesResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *RemoveLocalInventoriesOperation) Metadata() (*retailpb.RemoveLocalInventoriesMetadata, error) {
	var meta retailpb.RemoveLocalInventoriesMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *RemoveLocalInventoriesOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *RemoveLocalInventoriesOperation) Name() string {
	return op.lro.Name()
}

// SetInventoryOperation manages a long-running operation from SetInventory.
type SetInventoryOperation struct {
	lro *longrunning.Operation
}

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

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *SetInventoryOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*retailpb.SetInventoryResponse, error) {
	var resp retailpb.SetInventoryResponse
	if err := op.lro.WaitWithInterval(ctx, &resp, time.Minute, opts...); err != nil {
		return nil, err
	}
	return &resp, nil
}

// Poll fetches the latest state of the long-running operation.
//
// Poll also fetches the latest metadata, which can be retrieved by Metadata.
//
// If Poll fails, the error is returned and op is unmodified. If Poll succeeds and
// the operation has completed with failure, the error is returned and op.Done will return true.
// If Poll succeeds and the operation has completed successfully,
// op.Done will return true, and the response of the operation is returned.
// If Poll succeeds and the operation has not completed, the returned response and error are both nil.
func (op *SetInventoryOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*retailpb.SetInventoryResponse, error) {
	var resp retailpb.SetInventoryResponse
	if err := op.lro.Poll(ctx, &resp, opts...); err != nil {
		return nil, err
	}
	if !op.Done() {
		return nil, nil
	}
	return &resp, nil
}

// Metadata returns metadata associated with the long-running operation.
// Metadata itself does not contact the server, but Poll does.
// To get the latest metadata, call this method after a successful call to Poll.
// If the metadata is not available, the returned metadata and error are both nil.
func (op *SetInventoryOperation) Metadata() (*retailpb.SetInventoryMetadata, error) {
	var meta retailpb.SetInventoryMetadata
	if err := op.lro.Metadata(&meta); err == longrunning.ErrNoMetadata {
		return nil, nil
	} else if err != nil {
		return nil, err
	}
	return &meta, nil
}

// Done reports whether the long-running operation has completed.
func (op *SetInventoryOperation) Done() bool {
	return op.lro.Done()
}

// Name returns the name of the long-running operation.
// The name is assigned by the server and is unique within the service from which the operation is created.
func (op *SetInventoryOperation) Name() string {
	return op.lro.Name()
}

// ProductIterator manages a stream of *retailpb.Product.
type ProductIterator struct {
	items    []*retailpb.Product
	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.Product, nextPageToken string, err error)
}

// PageInfo supports pagination. See the google.golang.org/api/iterator package for details.
func (it *ProductIterator) 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 *ProductIterator) Next() (*retailpb.Product, error) {
	var item *retailpb.Product
	if err := it.nextFunc(); err != nil {
		return item, err
	}
	item = it.items[0]
	it.items = it.items[1:]
	return item, nil
}

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

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