// Copyright 2023 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 compute

import (
	"bytes"
	"context"
	"fmt"
	"io/ioutil"
	"math"
	"net/http"
	"net/url"
	"sort"
	"time"

	computepb "cloud.google.com/go/compute/apiv1/computepb"
	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"
	httptransport "google.golang.org/api/transport/http"
	"google.golang.org/grpc"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

var newBackendServicesClientHook clientHook

// BackendServicesCallOptions contains the retry settings for each method of BackendServicesClient.
type BackendServicesCallOptions struct {
	AddSignedUrlKey       []gax.CallOption
	AggregatedList        []gax.CallOption
	Delete                []gax.CallOption
	DeleteSignedUrlKey    []gax.CallOption
	Get                   []gax.CallOption
	GetHealth             []gax.CallOption
	GetIamPolicy          []gax.CallOption
	Insert                []gax.CallOption
	List                  []gax.CallOption
	Patch                 []gax.CallOption
	SetEdgeSecurityPolicy []gax.CallOption
	SetIamPolicy          []gax.CallOption
	SetSecurityPolicy     []gax.CallOption
	Update                []gax.CallOption
}

func defaultBackendServicesRESTCallOptions() *BackendServicesCallOptions {
	return &BackendServicesCallOptions{
		AddSignedUrlKey: []gax.CallOption{},
		AggregatedList: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusGatewayTimeout,
					http.StatusServiceUnavailable)
			}),
		},
		Delete:             []gax.CallOption{},
		DeleteSignedUrlKey: []gax.CallOption{},
		Get: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusGatewayTimeout,
					http.StatusServiceUnavailable)
			}),
		},
		GetHealth: []gax.CallOption{},
		GetIamPolicy: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusGatewayTimeout,
					http.StatusServiceUnavailable)
			}),
		},
		Insert: []gax.CallOption{},
		List: []gax.CallOption{
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    100 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusGatewayTimeout,
					http.StatusServiceUnavailable)
			}),
		},
		Patch:                 []gax.CallOption{},
		SetEdgeSecurityPolicy: []gax.CallOption{},
		SetIamPolicy:          []gax.CallOption{},
		SetSecurityPolicy:     []gax.CallOption{},
		Update:                []gax.CallOption{},
	}
}

// internalBackendServicesClient is an interface that defines the methods available from Google Compute Engine API.
type internalBackendServicesClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	AddSignedUrlKey(context.Context, *computepb.AddSignedUrlKeyBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	AggregatedList(context.Context, *computepb.AggregatedListBackendServicesRequest, ...gax.CallOption) *BackendServicesScopedListPairIterator
	Delete(context.Context, *computepb.DeleteBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	DeleteSignedUrlKey(context.Context, *computepb.DeleteSignedUrlKeyBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	Get(context.Context, *computepb.GetBackendServiceRequest, ...gax.CallOption) (*computepb.BackendService, error)
	GetHealth(context.Context, *computepb.GetHealthBackendServiceRequest, ...gax.CallOption) (*computepb.BackendServiceGroupHealth, error)
	GetIamPolicy(context.Context, *computepb.GetIamPolicyBackendServiceRequest, ...gax.CallOption) (*computepb.Policy, error)
	Insert(context.Context, *computepb.InsertBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	List(context.Context, *computepb.ListBackendServicesRequest, ...gax.CallOption) *BackendServiceIterator
	Patch(context.Context, *computepb.PatchBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	SetEdgeSecurityPolicy(context.Context, *computepb.SetEdgeSecurityPolicyBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	SetIamPolicy(context.Context, *computepb.SetIamPolicyBackendServiceRequest, ...gax.CallOption) (*computepb.Policy, error)
	SetSecurityPolicy(context.Context, *computepb.SetSecurityPolicyBackendServiceRequest, ...gax.CallOption) (*Operation, error)
	Update(context.Context, *computepb.UpdateBackendServiceRequest, ...gax.CallOption) (*Operation, error)
}

// BackendServicesClient is a client for interacting with Google Compute Engine API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// The BackendServices API.
type BackendServicesClient struct {
	// The internal transport-dependent client.
	internalClient internalBackendServicesClient

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

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

// AddSignedUrlKey adds a key for validating requests with signed URLs for this backend service.
func (c *BackendServicesClient) AddSignedUrlKey(ctx context.Context, req *computepb.AddSignedUrlKeyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.AddSignedUrlKey(ctx, req, opts...)
}

// AggregatedList retrieves the list of all BackendService resources, regional and global, available to the specified project.
func (c *BackendServicesClient) AggregatedList(ctx context.Context, req *computepb.AggregatedListBackendServicesRequest, opts ...gax.CallOption) *BackendServicesScopedListPairIterator {
	return c.internalClient.AggregatedList(ctx, req, opts...)
}

// Delete deletes the specified BackendService resource.
func (c *BackendServicesClient) Delete(ctx context.Context, req *computepb.DeleteBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.Delete(ctx, req, opts...)
}

// DeleteSignedUrlKey deletes a key for validating requests with signed URLs for this backend service.
func (c *BackendServicesClient) DeleteSignedUrlKey(ctx context.Context, req *computepb.DeleteSignedUrlKeyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.DeleteSignedUrlKey(ctx, req, opts...)
}

// Get returns the specified BackendService resource.
func (c *BackendServicesClient) Get(ctx context.Context, req *computepb.GetBackendServiceRequest, opts ...gax.CallOption) (*computepb.BackendService, error) {
	return c.internalClient.Get(ctx, req, opts...)
}

// GetHealth gets the most recent health check results for this BackendService. Example request body: { “group”: “/zones/us-east1-b/instanceGroups/lb-backend-example” }
func (c *BackendServicesClient) GetHealth(ctx context.Context, req *computepb.GetHealthBackendServiceRequest, opts ...gax.CallOption) (*computepb.BackendServiceGroupHealth, error) {
	return c.internalClient.GetHealth(ctx, req, opts...)
}

// GetIamPolicy gets the access control policy for a resource. May be empty if no such policy or resource exists.
func (c *BackendServicesClient) GetIamPolicy(ctx context.Context, req *computepb.GetIamPolicyBackendServiceRequest, opts ...gax.CallOption) (*computepb.Policy, error) {
	return c.internalClient.GetIamPolicy(ctx, req, opts...)
}

// Insert creates a BackendService resource in the specified project using the data included in the request. For more information, see Backend services overview .
func (c *BackendServicesClient) Insert(ctx context.Context, req *computepb.InsertBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.Insert(ctx, req, opts...)
}

// List retrieves the list of BackendService resources available to the specified project.
func (c *BackendServicesClient) List(ctx context.Context, req *computepb.ListBackendServicesRequest, opts ...gax.CallOption) *BackendServiceIterator {
	return c.internalClient.List(ctx, req, opts...)
}

// Patch patches the specified BackendService resource with the data included in the request. For more information, see Backend services overview. This method supports PATCH semantics and uses the JSON merge patch format and processing rules.
func (c *BackendServicesClient) Patch(ctx context.Context, req *computepb.PatchBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.Patch(ctx, req, opts...)
}

// SetEdgeSecurityPolicy sets the edge security policy for the specified backend service.
func (c *BackendServicesClient) SetEdgeSecurityPolicy(ctx context.Context, req *computepb.SetEdgeSecurityPolicyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.SetEdgeSecurityPolicy(ctx, req, opts...)
}

// SetIamPolicy sets the access control policy on the specified resource. Replaces any existing policy.
func (c *BackendServicesClient) SetIamPolicy(ctx context.Context, req *computepb.SetIamPolicyBackendServiceRequest, opts ...gax.CallOption) (*computepb.Policy, error) {
	return c.internalClient.SetIamPolicy(ctx, req, opts...)
}

// SetSecurityPolicy sets the Google Cloud Armor security policy for the specified backend service. For more information, see Google Cloud Armor Overview
func (c *BackendServicesClient) SetSecurityPolicy(ctx context.Context, req *computepb.SetSecurityPolicyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.SetSecurityPolicy(ctx, req, opts...)
}

// Update updates the specified BackendService resource with the data included in the request. For more information, see Backend services overview.
func (c *BackendServicesClient) Update(ctx context.Context, req *computepb.UpdateBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	return c.internalClient.Update(ctx, req, opts...)
}

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

	// The http client.
	httpClient *http.Client

	// operationClient is used to call the operation-specific management service.
	operationClient *GlobalOperationsClient

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

	// Points back to the CallOptions field of the containing BackendServicesClient
	CallOptions **BackendServicesCallOptions
}

// NewBackendServicesRESTClient creates a new backend services rest client.
//
// The BackendServices API.
func NewBackendServicesRESTClient(ctx context.Context, opts ...option.ClientOption) (*BackendServicesClient, error) {
	clientOpts := append(defaultBackendServicesRESTClientOptions(), opts...)
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
		return nil, err
	}

	callOpts := defaultBackendServicesRESTCallOptions()
	c := &backendServicesRESTClient{
		endpoint:    endpoint,
		httpClient:  httpClient,
		CallOptions: &callOpts,
	}
	c.setGoogleClientInfo()

	o := []option.ClientOption{
		option.WithHTTPClient(httpClient),
		option.WithEndpoint(endpoint),
	}
	opC, err := NewGlobalOperationsRESTClient(ctx, o...)
	if err != nil {
		return nil, err
	}
	c.operationClient = opC

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

func defaultBackendServicesRESTClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("https://compute.googleapis.com"),
		internaloption.WithDefaultMTLSEndpoint("https://compute.mtls.googleapis.com"),
		internaloption.WithDefaultAudience("https://compute.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 *backendServicesRESTClient) 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 *backendServicesRESTClient) Close() error {
	// Replace httpClient with nil to force cleanup.
	c.httpClient = nil
	if err := c.operationClient.Close(); err != nil {
		return err
	}
	return nil
}

// Connection returns a connection to the API service.
//
// Deprecated: This method always returns nil.
func (c *backendServicesRESTClient) Connection() *grpc.ClientConn {
	return nil
}

// AddSignedUrlKey adds a key for validating requests with signed URLs for this backend service.
func (c *backendServicesRESTClient) AddSignedUrlKey(ctx context.Context, req *computepb.AddSignedUrlKeyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetSignedUrlKeyResource()
	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("/compute/v1/projects/%v/global/backendServices/%v/addSignedUrlKey", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).AddSignedUrlKey[0:len((*c.CallOptions).AddSignedUrlKey):len((*c.CallOptions).AddSignedUrlKey)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// AggregatedList retrieves the list of all BackendService resources, regional and global, available to the specified project.
func (c *backendServicesRESTClient) AggregatedList(ctx context.Context, req *computepb.AggregatedListBackendServicesRequest, opts ...gax.CallOption) *BackendServicesScopedListPairIterator {
	it := &BackendServicesScopedListPairIterator{}
	req = proto.Clone(req).(*computepb.AggregatedListBackendServicesRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]BackendServicesScopedListPair, string, error) {
		resp := &computepb.BackendServiceAggregatedList{}
		if pageToken != "" {
			req.PageToken = proto.String(pageToken)
		}
		if pageSize > math.MaxInt32 {
			req.MaxResults = proto.Uint32(math.MaxInt32)
		} else if pageSize != 0 {
			req.MaxResults = proto.Uint32(uint32(pageSize))
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/compute/v1/projects/%v/aggregated/backendServices", req.GetProject())

		params := url.Values{}
		if req != nil && req.Filter != nil {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req != nil && req.IncludeAllScopes != nil {
			params.Add("includeAllScopes", fmt.Sprintf("%v", req.GetIncludeAllScopes()))
		}
		if req != nil && req.MaxResults != nil {
			params.Add("maxResults", fmt.Sprintf("%v", req.GetMaxResults()))
		}
		if req != nil && req.OrderBy != nil {
			params.Add("orderBy", fmt.Sprintf("%v", req.GetOrderBy()))
		}
		if req != nil && req.PageToken != nil {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}
		if req != nil && req.ReturnPartialSuccess != nil {
			params.Add("returnPartialSuccess", fmt.Sprintf("%v", req.GetReturnPartialSuccess()))
		}

		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

		elems := make([]BackendServicesScopedListPair, 0, len(resp.GetItems()))
		for k, v := range resp.GetItems() {
			elems = append(elems, BackendServicesScopedListPair{k, v})
		}
		sort.Slice(elems, func(i, j int) bool { return elems[i].Key < elems[j].Key })

		return elems, 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.GetMaxResults())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

// Delete deletes the specified BackendService resource.
func (c *backendServicesRESTClient) Delete(ctx context.Context, req *computepb.DeleteBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/compute/v1/projects/%v/global/backendServices/%v", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).Delete[0:len((*c.CallOptions).Delete):len((*c.CallOptions).Delete)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	e := 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()

		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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// DeleteSignedUrlKey deletes a key for validating requests with signed URLs for this backend service.
func (c *backendServicesRESTClient) DeleteSignedUrlKey(ctx context.Context, req *computepb.DeleteSignedUrlKeyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/compute/v1/projects/%v/global/backendServices/%v/deleteSignedUrlKey", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	params.Add("keyName", fmt.Sprintf("%v", req.GetKeyName()))
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).DeleteSignedUrlKey[0:len((*c.CallOptions).DeleteSignedUrlKey):len((*c.CallOptions).DeleteSignedUrlKey)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	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(), 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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// Get returns the specified BackendService resource.
func (c *backendServicesRESTClient) Get(ctx context.Context, req *computepb.GetBackendServiceRequest, opts ...gax.CallOption) (*computepb.BackendService, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/compute/v1/projects/%v/global/backendServices/%v", req.GetProject(), req.GetBackendService())

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).Get[0:len((*c.CallOptions).Get):len((*c.CallOptions).Get)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.BackendService{}
	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
}

// GetHealth gets the most recent health check results for this BackendService. Example request body: { “group”: “/zones/us-east1-b/instanceGroups/lb-backend-example” }
func (c *backendServicesRESTClient) GetHealth(ctx context.Context, req *computepb.GetHealthBackendServiceRequest, opts ...gax.CallOption) (*computepb.BackendServiceGroupHealth, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetResourceGroupReferenceResource()
	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("/compute/v1/projects/%v/global/backendServices/%v/getHealth", req.GetProject(), req.GetBackendService())

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).GetHealth[0:len((*c.CallOptions).GetHealth):len((*c.CallOptions).GetHealth)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.BackendServiceGroupHealth{}
	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
}

// GetIamPolicy gets the access control policy for a resource. May be empty if no such policy or resource exists.
func (c *backendServicesRESTClient) GetIamPolicy(ctx context.Context, req *computepb.GetIamPolicyBackendServiceRequest, opts ...gax.CallOption) (*computepb.Policy, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/compute/v1/projects/%v/global/backendServices/%v/getIamPolicy", req.GetProject(), req.GetResource())

	params := url.Values{}
	if req != nil && req.OptionsRequestedPolicyVersion != nil {
		params.Add("optionsRequestedPolicyVersion", fmt.Sprintf("%v", req.GetOptionsRequestedPolicyVersion()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).GetIamPolicy[0:len((*c.CallOptions).GetIamPolicy):len((*c.CallOptions).GetIamPolicy)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Policy{}
	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
}

// Insert creates a BackendService resource in the specified project using the data included in the request. For more information, see Backend services overview .
func (c *backendServicesRESTClient) Insert(ctx context.Context, req *computepb.InsertBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetBackendServiceResource()
	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("/compute/v1/projects/%v/global/backendServices", req.GetProject())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).Insert[0:len((*c.CallOptions).Insert):len((*c.CallOptions).Insert)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// List retrieves the list of BackendService resources available to the specified project.
func (c *backendServicesRESTClient) List(ctx context.Context, req *computepb.ListBackendServicesRequest, opts ...gax.CallOption) *BackendServiceIterator {
	it := &BackendServiceIterator{}
	req = proto.Clone(req).(*computepb.ListBackendServicesRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*computepb.BackendService, string, error) {
		resp := &computepb.BackendServiceList{}
		if pageToken != "" {
			req.PageToken = proto.String(pageToken)
		}
		if pageSize > math.MaxInt32 {
			req.MaxResults = proto.Uint32(math.MaxInt32)
		} else if pageSize != 0 {
			req.MaxResults = proto.Uint32(uint32(pageSize))
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/compute/v1/projects/%v/global/backendServices", req.GetProject())

		params := url.Values{}
		if req != nil && req.Filter != nil {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req != nil && req.MaxResults != nil {
			params.Add("maxResults", fmt.Sprintf("%v", req.GetMaxResults()))
		}
		if req != nil && req.OrderBy != nil {
			params.Add("orderBy", fmt.Sprintf("%v", req.GetOrderBy()))
		}
		if req != nil && req.PageToken != nil {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}
		if req != nil && req.ReturnPartialSuccess != nil {
			params.Add("returnPartialSuccess", fmt.Sprintf("%v", req.GetReturnPartialSuccess()))
		}

		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.GetItems(), 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.GetMaxResults())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

// Patch patches the specified BackendService resource with the data included in the request. For more information, see Backend services overview. This method supports PATCH semantics and uses the JSON merge patch format and processing rules.
func (c *backendServicesRESTClient) Patch(ctx context.Context, req *computepb.PatchBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetBackendServiceResource()
	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("/compute/v1/projects/%v/global/backendServices/%v", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).Patch[0:len((*c.CallOptions).Patch):len((*c.CallOptions).Patch)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// SetEdgeSecurityPolicy sets the edge security policy for the specified backend service.
func (c *backendServicesRESTClient) SetEdgeSecurityPolicy(ctx context.Context, req *computepb.SetEdgeSecurityPolicyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetSecurityPolicyReferenceResource()
	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("/compute/v1/projects/%v/global/backendServices/%v/setEdgeSecurityPolicy", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).SetEdgeSecurityPolicy[0:len((*c.CallOptions).SetEdgeSecurityPolicy):len((*c.CallOptions).SetEdgeSecurityPolicy)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// SetIamPolicy sets the access control policy on the specified resource. Replaces any existing policy.
func (c *backendServicesRESTClient) SetIamPolicy(ctx context.Context, req *computepb.SetIamPolicyBackendServiceRequest, opts ...gax.CallOption) (*computepb.Policy, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetGlobalSetPolicyRequestResource()
	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("/compute/v1/projects/%v/global/backendServices/%v/setIamPolicy", req.GetProject(), req.GetResource())

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).SetIamPolicy[0:len((*c.CallOptions).SetIamPolicy):len((*c.CallOptions).SetIamPolicy)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Policy{}
	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
}

// SetSecurityPolicy sets the Google Cloud Armor security policy for the specified backend service. For more information, see Google Cloud Armor Overview
func (c *backendServicesRESTClient) SetSecurityPolicy(ctx context.Context, req *computepb.SetSecurityPolicyBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetSecurityPolicyReferenceResource()
	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("/compute/v1/projects/%v/global/backendServices/%v/setSecurityPolicy", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).SetSecurityPolicy[0:len((*c.CallOptions).SetSecurityPolicy):len((*c.CallOptions).SetSecurityPolicy)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// Update updates the specified BackendService resource with the data included in the request. For more information, see Backend services overview.
func (c *backendServicesRESTClient) Update(ctx context.Context, req *computepb.UpdateBackendServiceRequest, opts ...gax.CallOption) (*Operation, error) {
	m := protojson.MarshalOptions{AllowPartial: true}
	body := req.GetBackendServiceResource()
	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("/compute/v1/projects/%v/global/backendServices/%v", req.GetProject(), req.GetBackendService())

	params := url.Values{}
	if req != nil && req.RequestId != nil {
		params.Add("requestId", fmt.Sprintf("%v", req.GetRequestId()))
	}

	baseUrl.RawQuery = params.Encode()

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

	headers := buildHeaders(ctx, c.xGoogMetadata, md, metadata.Pairs("Content-Type", "application/json"))
	opts = append((*c.CallOptions).Update[0:len((*c.CallOptions).Update):len((*c.CallOptions).Update)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &computepb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("PUT", 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
	}
	op := &Operation{
		&globalOperationsHandle{
			c:       c.operationClient,
			proto:   resp,
			project: req.GetProject(),
		},
	}
	return op, nil
}

// BackendServiceIterator manages a stream of *computepb.BackendService.
type BackendServiceIterator struct {
	items    []*computepb.BackendService
	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 []*computepb.BackendService, nextPageToken string, err error)
}

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

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

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

// BackendServicesScopedListPair is a holder type for string/*computepb.BackendServicesScopedList map entries
type BackendServicesScopedListPair struct {
	Key   string
	Value *computepb.BackendServicesScopedList
}

// BackendServicesScopedListPairIterator manages a stream of BackendServicesScopedListPair.
type BackendServicesScopedListPairIterator struct {
	items    []BackendServicesScopedListPair
	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 []BackendServicesScopedListPair, nextPageToken string, err error)
}

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

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

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