apigateway/apiv1/api_gateway_client.go

// 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 apigateway

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

	apigatewaypb "cloud.google.com/go/apigateway/apiv1/apigatewaypb"
	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/googleapi"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	httptransport "google.golang.org/api/transport/http"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/protobuf/encoding/protojson"
	"google.golang.org/protobuf/proto"
)

var newClientHook clientHook

// CallOptions contains the retry settings for each method of Client.
type CallOptions struct {
	ListGateways    []gax.CallOption
	GetGateway      []gax.CallOption
	CreateGateway   []gax.CallOption
	UpdateGateway   []gax.CallOption
	DeleteGateway   []gax.CallOption
	ListApis        []gax.CallOption
	GetApi          []gax.CallOption
	CreateApi       []gax.CallOption
	UpdateApi       []gax.CallOption
	DeleteApi       []gax.CallOption
	ListApiConfigs  []gax.CallOption
	GetApiConfig    []gax.CallOption
	CreateApiConfig []gax.CallOption
	UpdateApiConfig []gax.CallOption
	DeleteApiConfig []gax.CallOption
}

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

func defaultCallOptions() *CallOptions {
	return &CallOptions{
		ListGateways: []gax.CallOption{},
		GetGateway:   []gax.CallOption{},
		CreateGateway: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		UpdateGateway: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		DeleteGateway: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		ListApis: []gax.CallOption{},
		GetApi:   []gax.CallOption{},
		CreateApi: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		UpdateApi: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		DeleteApi: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		ListApiConfigs: []gax.CallOption{},
		GetApiConfig:   []gax.CallOption{},
		CreateApiConfig: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		UpdateApiConfig: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
		DeleteApiConfig: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unknown,
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				})
			}),
		},
	}
}

func defaultRESTCallOptions() *CallOptions {
	return &CallOptions{
		ListGateways: []gax.CallOption{},
		GetGateway:   []gax.CallOption{},
		CreateGateway: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		UpdateGateway: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		DeleteGateway: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		ListApis: []gax.CallOption{},
		GetApi:   []gax.CallOption{},
		CreateApi: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		UpdateApi: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		DeleteApi: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		ListApiConfigs: []gax.CallOption{},
		GetApiConfig:   []gax.CallOption{},
		CreateApiConfig: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		UpdateApiConfig: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
		DeleteApiConfig: []gax.CallOption{
			gax.WithTimeout(60000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        60000 * time.Millisecond,
					Multiplier: 2.00,
				},
					http.StatusInternalServerError,
					http.StatusServiceUnavailable)
			}),
		},
	}
}

// internalClient is an interface that defines the methods available from API Gateway API.
type internalClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	ListGateways(context.Context, *apigatewaypb.ListGatewaysRequest, ...gax.CallOption) *GatewayIterator
	GetGateway(context.Context, *apigatewaypb.GetGatewayRequest, ...gax.CallOption) (*apigatewaypb.Gateway, error)
	CreateGateway(context.Context, *apigatewaypb.CreateGatewayRequest, ...gax.CallOption) (*CreateGatewayOperation, error)
	CreateGatewayOperation(name string) *CreateGatewayOperation
	UpdateGateway(context.Context, *apigatewaypb.UpdateGatewayRequest, ...gax.CallOption) (*UpdateGatewayOperation, error)
	UpdateGatewayOperation(name string) *UpdateGatewayOperation
	DeleteGateway(context.Context, *apigatewaypb.DeleteGatewayRequest, ...gax.CallOption) (*DeleteGatewayOperation, error)
	DeleteGatewayOperation(name string) *DeleteGatewayOperation
	ListApis(context.Context, *apigatewaypb.ListApisRequest, ...gax.CallOption) *ApiIterator
	GetApi(context.Context, *apigatewaypb.GetApiRequest, ...gax.CallOption) (*apigatewaypb.Api, error)
	CreateApi(context.Context, *apigatewaypb.CreateApiRequest, ...gax.CallOption) (*CreateApiOperation, error)
	CreateApiOperation(name string) *CreateApiOperation
	UpdateApi(context.Context, *apigatewaypb.UpdateApiRequest, ...gax.CallOption) (*UpdateApiOperation, error)
	UpdateApiOperation(name string) *UpdateApiOperation
	DeleteApi(context.Context, *apigatewaypb.DeleteApiRequest, ...gax.CallOption) (*DeleteApiOperation, error)
	DeleteApiOperation(name string) *DeleteApiOperation
	ListApiConfigs(context.Context, *apigatewaypb.ListApiConfigsRequest, ...gax.CallOption) *ApiConfigIterator
	GetApiConfig(context.Context, *apigatewaypb.GetApiConfigRequest, ...gax.CallOption) (*apigatewaypb.ApiConfig, error)
	CreateApiConfig(context.Context, *apigatewaypb.CreateApiConfigRequest, ...gax.CallOption) (*CreateApiConfigOperation, error)
	CreateApiConfigOperation(name string) *CreateApiConfigOperation
	UpdateApiConfig(context.Context, *apigatewaypb.UpdateApiConfigRequest, ...gax.CallOption) (*UpdateApiConfigOperation, error)
	UpdateApiConfigOperation(name string) *UpdateApiConfigOperation
	DeleteApiConfig(context.Context, *apigatewaypb.DeleteApiConfigRequest, ...gax.CallOption) (*DeleteApiConfigOperation, error)
	DeleteApiConfigOperation(name string) *DeleteApiConfigOperation
}

// Client is a client for interacting with API Gateway API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// The API Gateway Service is the interface for managing API Gateways.
type Client struct {
	// The internal transport-dependent client.
	internalClient internalClient

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

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

// ListGateways lists Gateways in a given project and location.
func (c *Client) ListGateways(ctx context.Context, req *apigatewaypb.ListGatewaysRequest, opts ...gax.CallOption) *GatewayIterator {
	return c.internalClient.ListGateways(ctx, req, opts...)
}

// GetGateway gets details of a single Gateway.
func (c *Client) GetGateway(ctx context.Context, req *apigatewaypb.GetGatewayRequest, opts ...gax.CallOption) (*apigatewaypb.Gateway, error) {
	return c.internalClient.GetGateway(ctx, req, opts...)
}

// CreateGateway creates a new Gateway in a given project and location.
func (c *Client) CreateGateway(ctx context.Context, req *apigatewaypb.CreateGatewayRequest, opts ...gax.CallOption) (*CreateGatewayOperation, error) {
	return c.internalClient.CreateGateway(ctx, req, opts...)
}

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

// UpdateGateway updates the parameters of a single Gateway.
func (c *Client) UpdateGateway(ctx context.Context, req *apigatewaypb.UpdateGatewayRequest, opts ...gax.CallOption) (*UpdateGatewayOperation, error) {
	return c.internalClient.UpdateGateway(ctx, req, opts...)
}

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

// DeleteGateway deletes a single Gateway.
func (c *Client) DeleteGateway(ctx context.Context, req *apigatewaypb.DeleteGatewayRequest, opts ...gax.CallOption) (*DeleteGatewayOperation, error) {
	return c.internalClient.DeleteGateway(ctx, req, opts...)
}

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

// ListApis lists Apis in a given project and location.
func (c *Client) ListApis(ctx context.Context, req *apigatewaypb.ListApisRequest, opts ...gax.CallOption) *ApiIterator {
	return c.internalClient.ListApis(ctx, req, opts...)
}

// GetApi gets details of a single Api.
func (c *Client) GetApi(ctx context.Context, req *apigatewaypb.GetApiRequest, opts ...gax.CallOption) (*apigatewaypb.Api, error) {
	return c.internalClient.GetApi(ctx, req, opts...)
}

// CreateApi creates a new Api in a given project and location.
func (c *Client) CreateApi(ctx context.Context, req *apigatewaypb.CreateApiRequest, opts ...gax.CallOption) (*CreateApiOperation, error) {
	return c.internalClient.CreateApi(ctx, req, opts...)
}

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

// UpdateApi updates the parameters of a single Api.
func (c *Client) UpdateApi(ctx context.Context, req *apigatewaypb.UpdateApiRequest, opts ...gax.CallOption) (*UpdateApiOperation, error) {
	return c.internalClient.UpdateApi(ctx, req, opts...)
}

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

// DeleteApi deletes a single Api.
func (c *Client) DeleteApi(ctx context.Context, req *apigatewaypb.DeleteApiRequest, opts ...gax.CallOption) (*DeleteApiOperation, error) {
	return c.internalClient.DeleteApi(ctx, req, opts...)
}

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

// ListApiConfigs lists ApiConfigs in a given project and location.
func (c *Client) ListApiConfigs(ctx context.Context, req *apigatewaypb.ListApiConfigsRequest, opts ...gax.CallOption) *ApiConfigIterator {
	return c.internalClient.ListApiConfigs(ctx, req, opts...)
}

// GetApiConfig gets details of a single ApiConfig.
func (c *Client) GetApiConfig(ctx context.Context, req *apigatewaypb.GetApiConfigRequest, opts ...gax.CallOption) (*apigatewaypb.ApiConfig, error) {
	return c.internalClient.GetApiConfig(ctx, req, opts...)
}

// CreateApiConfig creates a new ApiConfig in a given project and location.
func (c *Client) CreateApiConfig(ctx context.Context, req *apigatewaypb.CreateApiConfigRequest, opts ...gax.CallOption) (*CreateApiConfigOperation, error) {
	return c.internalClient.CreateApiConfig(ctx, req, opts...)
}

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

// UpdateApiConfig updates the parameters of a single ApiConfig.
func (c *Client) UpdateApiConfig(ctx context.Context, req *apigatewaypb.UpdateApiConfigRequest, opts ...gax.CallOption) (*UpdateApiConfigOperation, error) {
	return c.internalClient.UpdateApiConfig(ctx, req, opts...)
}

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

// DeleteApiConfig deletes a single ApiConfig.
func (c *Client) DeleteApiConfig(ctx context.Context, req *apigatewaypb.DeleteApiConfigRequest, opts ...gax.CallOption) (*DeleteApiConfigOperation, error) {
	return c.internalClient.DeleteApiConfig(ctx, req, opts...)
}

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

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

	// Points back to the CallOptions field of the containing Client
	CallOptions **CallOptions

	// The gRPC API client.
	client apigatewaypb.ApiGatewayServiceClient

	// 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.
	xGoogHeaders []string
}

// NewClient creates a new api gateway service client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// The API Gateway Service is the interface for managing API Gateways.
func NewClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	clientOpts := defaultGRPCClientOptions()
	if newClientHook != nil {
		hookOpts, err := newClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

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

	c := &gRPCClient{
		connPool:    connPool,
		client:      apigatewaypb.NewApiGatewayServiceClient(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: Connections are now pooled so this method does not always
// return the same resource.
func (c *gRPCClient) 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 *gRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
}

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

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

	// The http client.
	httpClient *http.Client

	// 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-* headers to be sent with each request.
	xGoogHeaders []string

	// Points back to the CallOptions field of the containing Client
	CallOptions **CallOptions
}

// NewRESTClient creates a new api gateway service rest client.
//
// The API Gateway Service is the interface for managing API Gateways.
func NewRESTClient(ctx context.Context, opts ...option.ClientOption) (*Client, error) {
	clientOpts := append(defaultRESTClientOptions(), opts...)
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
		return nil, err
	}

	callOpts := defaultRESTCallOptions()
	c := &restClient{
		endpoint:    endpoint,
		httpClient:  httpClient,
		CallOptions: &callOpts,
	}
	c.setGoogleClientInfo()

	lroOpts := []option.ClientOption{
		option.WithHTTPClient(httpClient),
		option.WithEndpoint(endpoint),
	}
	opClient, err := lroauto.NewOperationsRESTClient(ctx, lroOpts...)
	if err != nil {
		return nil, err
	}
	c.LROClient = &opClient

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

func defaultRESTClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("https://apigateway.googleapis.com"),
		internaloption.WithDefaultEndpointTemplate("https://apigateway.UNIVERSE_DOMAIN"),
		internaloption.WithDefaultMTLSEndpoint("https://apigateway.mtls.googleapis.com"),
		internaloption.WithDefaultUniverseDomain("googleapis.com"),
		internaloption.WithDefaultAudience("https://apigateway.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 *restClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN")
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *restClient) Close() error {
	// Replace httpClient with nil to force cleanup.
	c.httpClient = nil
	return nil
}

// Connection returns a connection to the API service.
//
// Deprecated: This method always returns nil.
func (c *restClient) Connection() *grpc.ClientConn {
	return nil
}
func (c *gRPCClient) ListGateways(ctx context.Context, req *apigatewaypb.ListGatewaysRequest, opts ...gax.CallOption) *GatewayIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListGateways[0:len((*c.CallOptions).ListGateways):len((*c.CallOptions).ListGateways)], opts...)
	it := &GatewayIterator{}
	req = proto.Clone(req).(*apigatewaypb.ListGatewaysRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*apigatewaypb.Gateway, string, error) {
		resp := &apigatewaypb.ListGatewaysResponse{}
		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.client.ListGateways(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetGateways(), 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 *gRPCClient) GetGateway(ctx context.Context, req *apigatewaypb.GetGatewayRequest, opts ...gax.CallOption) (*apigatewaypb.Gateway, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

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

func (c *gRPCClient) CreateGateway(ctx context.Context, req *apigatewaypb.CreateGatewayRequest, opts ...gax.CallOption) (*CreateGatewayOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

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

func (c *gRPCClient) UpdateGateway(ctx context.Context, req *apigatewaypb.UpdateGatewayRequest, opts ...gax.CallOption) (*UpdateGatewayOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "gateway.name", url.QueryEscape(req.GetGateway().GetName()))}

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

func (c *gRPCClient) DeleteGateway(ctx context.Context, req *apigatewaypb.DeleteGatewayRequest, opts ...gax.CallOption) (*DeleteGatewayOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

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

func (c *gRPCClient) ListApis(ctx context.Context, req *apigatewaypb.ListApisRequest, opts ...gax.CallOption) *ApiIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListApis[0:len((*c.CallOptions).ListApis):len((*c.CallOptions).ListApis)], opts...)
	it := &ApiIterator{}
	req = proto.Clone(req).(*apigatewaypb.ListApisRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*apigatewaypb.Api, string, error) {
		resp := &apigatewaypb.ListApisResponse{}
		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.client.ListApis(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetApis(), 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 *gRPCClient) GetApi(ctx context.Context, req *apigatewaypb.GetApiRequest, opts ...gax.CallOption) (*apigatewaypb.Api, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

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

func (c *gRPCClient) CreateApi(ctx context.Context, req *apigatewaypb.CreateApiRequest, opts ...gax.CallOption) (*CreateApiOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

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

func (c *gRPCClient) UpdateApi(ctx context.Context, req *apigatewaypb.UpdateApiRequest, opts ...gax.CallOption) (*UpdateApiOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "api.name", url.QueryEscape(req.GetApi().GetName()))}

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

func (c *gRPCClient) DeleteApi(ctx context.Context, req *apigatewaypb.DeleteApiRequest, opts ...gax.CallOption) (*DeleteApiOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

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

func (c *gRPCClient) ListApiConfigs(ctx context.Context, req *apigatewaypb.ListApiConfigsRequest, opts ...gax.CallOption) *ApiConfigIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListApiConfigs[0:len((*c.CallOptions).ListApiConfigs):len((*c.CallOptions).ListApiConfigs)], opts...)
	it := &ApiConfigIterator{}
	req = proto.Clone(req).(*apigatewaypb.ListApiConfigsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*apigatewaypb.ApiConfig, string, error) {
		resp := &apigatewaypb.ListApiConfigsResponse{}
		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.client.ListApiConfigs(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetApiConfigs(), 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 *gRPCClient) GetApiConfig(ctx context.Context, req *apigatewaypb.GetApiConfigRequest, opts ...gax.CallOption) (*apigatewaypb.ApiConfig, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

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

func (c *gRPCClient) CreateApiConfig(ctx context.Context, req *apigatewaypb.CreateApiConfigRequest, opts ...gax.CallOption) (*CreateApiConfigOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

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

func (c *gRPCClient) UpdateApiConfig(ctx context.Context, req *apigatewaypb.UpdateApiConfigRequest, opts ...gax.CallOption) (*UpdateApiConfigOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "api_config.name", url.QueryEscape(req.GetApiConfig().GetName()))}

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

func (c *gRPCClient) DeleteApiConfig(ctx context.Context, req *apigatewaypb.DeleteApiConfigRequest, opts ...gax.CallOption) (*DeleteApiConfigOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

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

// ListGateways lists Gateways in a given project and location.
func (c *restClient) ListGateways(ctx context.Context, req *apigatewaypb.ListGatewaysRequest, opts ...gax.CallOption) *GatewayIterator {
	it := &GatewayIterator{}
	req = proto.Clone(req).(*apigatewaypb.ListGatewaysRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*apigatewaypb.Gateway, string, error) {
		resp := &apigatewaypb.ListGatewaysResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v1/%v/gateways", req.GetParent())

		params := url.Values{}
		params.Add("$alt", "json;enum-encoding=int")
		if req.GetFilter() != "" {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req.GetOrderBy() != "" {
			params.Add("orderBy", fmt.Sprintf("%v", req.GetOrderBy()))
		}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		hds := append(c.xGoogHeaders, "Content-Type", "application/json")
		headers := gax.BuildHeaders(ctx, hds...)
		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 := io.ReadAll(httpRsp.Body)
			if err != nil {
				return err
			}

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

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

// GetGateway gets details of a single Gateway.
func (c *restClient) GetGateway(ctx context.Context, req *apigatewaypb.GetGatewayRequest, opts ...gax.CallOption) (*apigatewaypb.Gateway, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).GetGateway[0:len((*c.CallOptions).GetGateway):len((*c.CallOptions).GetGateway)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &apigatewaypb.Gateway{}
	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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

// CreateGateway creates a new Gateway in a given project and location.
func (c *restClient) CreateGateway(ctx context.Context, req *apigatewaypb.CreateGatewayRequest, opts ...gax.CallOption) (*CreateGatewayOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetGateway()
	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("/v1/%v/gateways", req.GetParent())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	params.Add("gatewayId", fmt.Sprintf("%v", req.GetGatewayId()))

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &CreateGatewayOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// UpdateGateway updates the parameters of a single Gateway.
func (c *restClient) UpdateGateway(ctx context.Context, req *apigatewaypb.UpdateGatewayRequest, opts ...gax.CallOption) (*UpdateGatewayOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetGateway()
	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("/v1/%v", req.GetGateway().GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	if req.GetUpdateMask() != nil {
		updateMask, err := protojson.Marshal(req.GetUpdateMask())
		if err != nil {
			return nil, err
		}
		params.Add("updateMask", string(updateMask[1:len(updateMask)-1]))
	}

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "gateway.name", url.QueryEscape(req.GetGateway().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &UpdateGatewayOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// DeleteGateway deletes a single Gateway.
func (c *restClient) DeleteGateway(ctx context.Context, req *apigatewaypb.DeleteGatewayRequest, opts ...gax.CallOption) (*DeleteGatewayOperation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &DeleteGatewayOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// ListApis lists Apis in a given project and location.
func (c *restClient) ListApis(ctx context.Context, req *apigatewaypb.ListApisRequest, opts ...gax.CallOption) *ApiIterator {
	it := &ApiIterator{}
	req = proto.Clone(req).(*apigatewaypb.ListApisRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*apigatewaypb.Api, string, error) {
		resp := &apigatewaypb.ListApisResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v1/%v/apis", req.GetParent())

		params := url.Values{}
		params.Add("$alt", "json;enum-encoding=int")
		if req.GetFilter() != "" {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req.GetOrderBy() != "" {
			params.Add("orderBy", fmt.Sprintf("%v", req.GetOrderBy()))
		}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		hds := append(c.xGoogHeaders, "Content-Type", "application/json")
		headers := gax.BuildHeaders(ctx, hds...)
		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 := io.ReadAll(httpRsp.Body)
			if err != nil {
				return err
			}

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

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

// GetApi gets details of a single Api.
func (c *restClient) GetApi(ctx context.Context, req *apigatewaypb.GetApiRequest, opts ...gax.CallOption) (*apigatewaypb.Api, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).GetApi[0:len((*c.CallOptions).GetApi):len((*c.CallOptions).GetApi)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &apigatewaypb.Api{}
	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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

// CreateApi creates a new Api in a given project and location.
func (c *restClient) CreateApi(ctx context.Context, req *apigatewaypb.CreateApiRequest, opts ...gax.CallOption) (*CreateApiOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetApi()
	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("/v1/%v/apis", req.GetParent())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	params.Add("apiId", fmt.Sprintf("%v", req.GetApiId()))

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &CreateApiOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// UpdateApi updates the parameters of a single Api.
func (c *restClient) UpdateApi(ctx context.Context, req *apigatewaypb.UpdateApiRequest, opts ...gax.CallOption) (*UpdateApiOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetApi()
	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("/v1/%v", req.GetApi().GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	if req.GetUpdateMask() != nil {
		updateMask, err := protojson.Marshal(req.GetUpdateMask())
		if err != nil {
			return nil, err
		}
		params.Add("updateMask", string(updateMask[1:len(updateMask)-1]))
	}

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "api.name", url.QueryEscape(req.GetApi().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &UpdateApiOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// DeleteApi deletes a single Api.
func (c *restClient) DeleteApi(ctx context.Context, req *apigatewaypb.DeleteApiRequest, opts ...gax.CallOption) (*DeleteApiOperation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &DeleteApiOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// ListApiConfigs lists ApiConfigs in a given project and location.
func (c *restClient) ListApiConfigs(ctx context.Context, req *apigatewaypb.ListApiConfigsRequest, opts ...gax.CallOption) *ApiConfigIterator {
	it := &ApiConfigIterator{}
	req = proto.Clone(req).(*apigatewaypb.ListApiConfigsRequest)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*apigatewaypb.ApiConfig, string, error) {
		resp := &apigatewaypb.ListApiConfigsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		baseUrl, err := url.Parse(c.endpoint)
		if err != nil {
			return nil, "", err
		}
		baseUrl.Path += fmt.Sprintf("/v1/%v/configs", req.GetParent())

		params := url.Values{}
		params.Add("$alt", "json;enum-encoding=int")
		if req.GetFilter() != "" {
			params.Add("filter", fmt.Sprintf("%v", req.GetFilter()))
		}
		if req.GetOrderBy() != "" {
			params.Add("orderBy", fmt.Sprintf("%v", req.GetOrderBy()))
		}
		if req.GetPageSize() != 0 {
			params.Add("pageSize", fmt.Sprintf("%v", req.GetPageSize()))
		}
		if req.GetPageToken() != "" {
			params.Add("pageToken", fmt.Sprintf("%v", req.GetPageToken()))
		}

		baseUrl.RawQuery = params.Encode()

		// Build HTTP headers from client and context metadata.
		hds := append(c.xGoogHeaders, "Content-Type", "application/json")
		headers := gax.BuildHeaders(ctx, hds...)
		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 := io.ReadAll(httpRsp.Body)
			if err != nil {
				return err
			}

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

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

// GetApiConfig gets details of a single ApiConfig.
func (c *restClient) GetApiConfig(ctx context.Context, req *apigatewaypb.GetApiConfigRequest, opts ...gax.CallOption) (*apigatewaypb.ApiConfig, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	if req.GetView() != 0 {
		params.Add("view", fmt.Sprintf("%v", req.GetView()))
	}

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((*c.CallOptions).GetApiConfig[0:len((*c.CallOptions).GetApiConfig):len((*c.CallOptions).GetApiConfig)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &apigatewaypb.ApiConfig{}
	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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

// CreateApiConfig creates a new ApiConfig in a given project and location.
func (c *restClient) CreateApiConfig(ctx context.Context, req *apigatewaypb.CreateApiConfigRequest, opts ...gax.CallOption) (*CreateApiConfigOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetApiConfig()
	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("/v1/%v/configs", req.GetParent())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	params.Add("apiConfigId", fmt.Sprintf("%v", req.GetApiConfigId()))

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &CreateApiConfigOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// UpdateApiConfig updates the parameters of a single ApiConfig.
func (c *restClient) UpdateApiConfig(ctx context.Context, req *apigatewaypb.UpdateApiConfigRequest, opts ...gax.CallOption) (*UpdateApiConfigOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetApiConfig()
	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("/v1/%v", req.GetApiConfig().GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")
	if req.GetUpdateMask() != nil {
		updateMask, err := protojson.Marshal(req.GetUpdateMask())
		if err != nil {
			return nil, err
		}
		params.Add("updateMask", string(updateMask[1:len(updateMask)-1]))
	}

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "api_config.name", url.QueryEscape(req.GetApiConfig().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &UpdateApiConfigOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

// DeleteApiConfig deletes a single ApiConfig.
func (c *restClient) DeleteApiConfig(ctx context.Context, req *apigatewaypb.DeleteApiConfigRequest, opts ...gax.CallOption) (*DeleteApiConfigOperation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1/%v", req.GetName())

	params := url.Values{}
	params.Add("$alt", "json;enum-encoding=int")

	baseUrl.RawQuery = params.Encode()

	// Build HTTP headers from client and context metadata.
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &longrunningpb.Operation{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("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 := io.ReadAll(httpRsp.Body)
		if err != nil {
			return err
		}

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

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

	override := fmt.Sprintf("/v1/%s", resp.GetName())
	return &DeleteApiConfigOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, resp),
		pollPath: override,
	}, nil
}

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

// CreateApiOperation returns a new CreateApiOperation from a given name.
// The name must be that of a previously created CreateApiOperation, possibly from a different process.
func (c *restClient) CreateApiOperation(name string) *CreateApiOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &CreateApiOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// CreateApiConfigOperation returns a new CreateApiConfigOperation from a given name.
// The name must be that of a previously created CreateApiConfigOperation, possibly from a different process.
func (c *restClient) CreateApiConfigOperation(name string) *CreateApiConfigOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &CreateApiConfigOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// CreateGatewayOperation returns a new CreateGatewayOperation from a given name.
// The name must be that of a previously created CreateGatewayOperation, possibly from a different process.
func (c *restClient) CreateGatewayOperation(name string) *CreateGatewayOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &CreateGatewayOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// DeleteApiOperation returns a new DeleteApiOperation from a given name.
// The name must be that of a previously created DeleteApiOperation, possibly from a different process.
func (c *restClient) DeleteApiOperation(name string) *DeleteApiOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &DeleteApiOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// DeleteApiConfigOperation returns a new DeleteApiConfigOperation from a given name.
// The name must be that of a previously created DeleteApiConfigOperation, possibly from a different process.
func (c *restClient) DeleteApiConfigOperation(name string) *DeleteApiConfigOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &DeleteApiConfigOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// DeleteGatewayOperation returns a new DeleteGatewayOperation from a given name.
// The name must be that of a previously created DeleteGatewayOperation, possibly from a different process.
func (c *restClient) DeleteGatewayOperation(name string) *DeleteGatewayOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &DeleteGatewayOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// UpdateApiOperation returns a new UpdateApiOperation from a given name.
// The name must be that of a previously created UpdateApiOperation, possibly from a different process.
func (c *restClient) UpdateApiOperation(name string) *UpdateApiOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &UpdateApiOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// UpdateApiConfigOperation returns a new UpdateApiConfigOperation from a given name.
// The name must be that of a previously created UpdateApiConfigOperation, possibly from a different process.
func (c *restClient) UpdateApiConfigOperation(name string) *UpdateApiConfigOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &UpdateApiConfigOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}

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

// UpdateGatewayOperation returns a new UpdateGatewayOperation from a given name.
// The name must be that of a previously created UpdateGatewayOperation, possibly from a different process.
func (c *restClient) UpdateGatewayOperation(name string) *UpdateGatewayOperation {
	override := fmt.Sprintf("/v1/%s", name)
	return &UpdateGatewayOperation{
		lro:      longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
		pollPath: override,
	}
}