functions/apiv2/auxiliary.go - gocloud - Git at Google

 // Copyright 2024 Google LLC
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     https://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.

 // Code generated by protoc-gen-go_gapic. DO NOT EDIT.

 package functions

 import (
 	"context"
 	"time"

 	functionspb "cloud.google.com/go/functions/apiv2/functionspb"
 	"cloud.google.com/go/longrunning"
 	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
 	gax "github.com/googleapis/gax-go/v2"
 	"google.golang.org/api/iterator"
 	locationpb "google.golang.org/genproto/googleapis/cloud/location"
 )

 // CreateFunctionOperation manages a long-running operation from CreateFunction.
 type CreateFunctionOperation struct {
 	lro      *longrunning.Operation
 	pollPath string
 }

 // 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 *CreateFunctionOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*functionspb.Function, error) {
 	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
 	var resp functionspb.Function
 	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 *CreateFunctionOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*functionspb.Function, error) {
 	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
 	var resp functionspb.Function
 	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 *CreateFunctionOperation) Metadata() (*functionspb.OperationMetadata, error) {
 	var meta functionspb.OperationMetadata
 	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 *CreateFunctionOperation) 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 *CreateFunctionOperation) Name() string {
 	return op.lro.Name()
 }

 // DeleteFunctionOperation manages a long-running operation from DeleteFunction.
 type DeleteFunctionOperation struct {
 	lro      *longrunning.Operation
 	pollPath string
 }

 // 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 *DeleteFunctionOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
 	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
 	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
 }

 // 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 *DeleteFunctionOperation) Poll(ctx context.Context, opts ...gax.CallOption) error {
 	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
 	return op.lro.Poll(ctx, nil, opts...)
 }

 // 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 *DeleteFunctionOperation) Metadata() (*functionspb.OperationMetadata, error) {
 	var meta functionspb.OperationMetadata
 	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 *DeleteFunctionOperation) 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 *DeleteFunctionOperation) Name() string {
 	return op.lro.Name()
 }

 // UpdateFunctionOperation manages a long-running operation from UpdateFunction.
 type UpdateFunctionOperation struct {
 	lro      *longrunning.Operation
 	pollPath string
 }

 // 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 *UpdateFunctionOperation) Wait(ctx context.Context, opts ...gax.CallOption) (*functionspb.Function, error) {
 	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
 	var resp functionspb.Function
 	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 *UpdateFunctionOperation) Poll(ctx context.Context, opts ...gax.CallOption) (*functionspb.Function, error) {
 	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
 	var resp functionspb.Function
 	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 *UpdateFunctionOperation) Metadata() (*functionspb.OperationMetadata, error) {
 	var meta functionspb.OperationMetadata
 	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 *UpdateFunctionOperation) 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 *UpdateFunctionOperation) Name() string {
 	return op.lro.Name()
 }

 // FunctionIterator manages a stream of *functionspb.Function.
 type FunctionIterator struct {
 	items    []*functionspb.Function
 	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 []*functionspb.Function, nextPageToken string, err error)
 }

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

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

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

 // LocationIterator manages a stream of *locationpb.Location.
 type LocationIterator struct {
 	items    []*locationpb.Location
 	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 []*locationpb.Location, nextPageToken string, err error)
 }

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

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

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

 // OperationIterator manages a stream of *longrunningpb.Operation.
 type OperationIterator struct {
 	items    []*longrunningpb.Operation
 	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 []*longrunningpb.Operation, nextPageToken string, err error)
 }

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

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

 func (it *OperationIterator) takeBuf() interface{} {
 	b := it.items
 	it.items = nil
 	return b
 }
	// Copyright 2024 Google LLC
	//
	// Licensed under the Apache License, Version 2.0 (the "License");
	// you may not use this file except in compliance with the License.
	// You may obtain a copy of the License at
	//
	// https://www.apache.org/licenses/LICENSE-2.0
	//
	// Unless required by applicable law or agreed to in writing, software
	// distributed under the License is distributed on an "AS IS" BASIS,
	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	// See the License for the specific language governing permissions and
	// limitations under the License.

	// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

	package functions

	import (
	"context"
	"time"

	functionspb "cloud.google.com/go/functions/apiv2/functionspb"
	"cloud.google.com/go/longrunning"
	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	locationpb "google.golang.org/genproto/googleapis/cloud/location"
	)

	// CreateFunctionOperation manages a long-running operation from CreateFunction.
	type CreateFunctionOperation struct {
	lro *longrunning.Operation
	pollPath string
	}

	// 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 CreateFunctionOperation) Wait(ctx context.Context, opts ...gax.CallOption) (functionspb.Function, error) {
	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
	var resp functionspb.Function
	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 CreateFunctionOperation) Poll(ctx context.Context, opts ...gax.CallOption) (functionspb.Function, error) {
	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
	var resp functionspb.Function
	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 CreateFunctionOperation) Metadata() (functionspb.OperationMetadata, error) {
	var meta functionspb.OperationMetadata
	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 *CreateFunctionOperation) 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 *CreateFunctionOperation) Name() string {
	return op.lro.Name()
	}

	// DeleteFunctionOperation manages a long-running operation from DeleteFunction.
	type DeleteFunctionOperation struct {
	lro *longrunning.Operation
	pollPath string
	}

	// 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 *DeleteFunctionOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
	}

	// 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 *DeleteFunctionOperation) Poll(ctx context.Context, opts ...gax.CallOption) error {
	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
	return op.lro.Poll(ctx, nil, opts...)
	}

	// 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 DeleteFunctionOperation) Metadata() (functionspb.OperationMetadata, error) {
	var meta functionspb.OperationMetadata
	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 *DeleteFunctionOperation) 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 *DeleteFunctionOperation) Name() string {
	return op.lro.Name()
	}

	// UpdateFunctionOperation manages a long-running operation from UpdateFunction.
	type UpdateFunctionOperation struct {
	lro *longrunning.Operation
	pollPath string
	}

	// 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 UpdateFunctionOperation) Wait(ctx context.Context, opts ...gax.CallOption) (functionspb.Function, error) {
	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
	var resp functionspb.Function
	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 UpdateFunctionOperation) Poll(ctx context.Context, opts ...gax.CallOption) (functionspb.Function, error) {
	opts = append([]gax.CallOption{gax.WithPath(op.pollPath)}, opts...)
	var resp functionspb.Function
	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 UpdateFunctionOperation) Metadata() (functionspb.OperationMetadata, error) {
	var meta functionspb.OperationMetadata
	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 *UpdateFunctionOperation) 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 *UpdateFunctionOperation) Name() string {
	return op.lro.Name()
	}

	// FunctionIterator manages a stream of *functionspb.Function.
	type FunctionIterator struct {
	items []*functionspb.Function
	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 []*functionspb.Function, nextPageToken string, err error)
	}

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

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

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

	// LocationIterator manages a stream of *locationpb.Location.
	type LocationIterator struct {
	items []*locationpb.Location
	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 []*locationpb.Location, nextPageToken string, err error)
	}

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

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

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

	// OperationIterator manages a stream of *longrunningpb.Operation.
	type OperationIterator struct {
	items []*longrunningpb.Operation
	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 []*longrunningpb.Operation, nextPageToken string, err error)
	}

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

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

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