// Copyright 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

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

package apigateway

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

	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	apigatewaypb "google.golang.org/genproto/googleapis/cloud/apigateway/v1"
	longrunningpb "google.golang.org/genproto/googleapis/longrunning"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/metadata"
	"google.golang.org/protobuf/proto"
)

var 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.WithDefaultMTLSEndpoint("apigateway.mtls.googleapis.com:443"),
		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.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.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.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.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.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.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.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.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.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,
				})
			}),
		},
	}
}

// internalClient is an interface that defines the methods availaible 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.
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

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

	// Points back to the CallOptions field of the containing 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.
	xGoogMetadata metadata.MD
}

// 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...)
	}

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

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

	c := &gRPCClient{
		connPool:         connPool,
		disableDeadlines: disableDeadlines,
		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.
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", versionGo()}, keyval...)
	kv = append(kv, "gapic", versionClient, "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogMetadata = metadata.Pairs("x-goog-api-client", gax.XGoogHeader(kv...))
}

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

func (c *gRPCClient) ListGateways(ctx context.Context, req *apigatewaypb.ListGatewaysRequest, opts ...gax.CallOption) *GatewayIterator {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "gateway.name", url.QueryEscape(req.GetGateway().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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 {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "api.name", url.QueryEscape(req.GetApi().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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 {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "api_config.name", url.QueryEscape(req.GetApiConfig().GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	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) {
	if _, ok := ctx.Deadline(); !ok && !c.disableDeadlines {
		cctx, cancel := context.WithTimeout(ctx, 60000*time.Millisecond)
		defer cancel()
		ctx = cctx
	}
	md := metadata.Pairs("x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName())))
	ctx = insertMetadata(ctx, c.xGoogMetadata, md)
	opts = append((*c.CallOptions).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
}

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

// 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}),
	}
}

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

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

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

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

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

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

// 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}),
	}
}

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

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

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

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

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

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

// 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}),
	}
}

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

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

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

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

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

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

// 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}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeleteApiOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
}

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

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

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

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

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

// 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}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeleteApiConfigOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
}

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

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

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

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

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

// 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}),
	}
}

// Wait blocks until the long-running operation is completed, returning the response and any errors encountered.
//
// See documentation of Poll for error-handling information.
func (op *DeleteGatewayOperation) Wait(ctx context.Context, opts ...gax.CallOption) error {
	return op.lro.WaitWithInterval(ctx, nil, time.Minute, opts...)
}

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

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

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

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

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

// 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}),
	}
}

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

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

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

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

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

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

// 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}),
	}
}

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

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

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

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

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

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

// 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}),
	}
}

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

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

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

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

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

// ApiConfigIterator manages a stream of *apigatewaypb.ApiConfig.
type ApiConfigIterator struct {
	items    []*apigatewaypb.ApiConfig
	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 []*apigatewaypb.ApiConfig, nextPageToken string, err error)
}

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

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

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

// ApiIterator manages a stream of *apigatewaypb.Api.
type ApiIterator struct {
	items    []*apigatewaypb.Api
	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 []*apigatewaypb.Api, nextPageToken string, err error)
}

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

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

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

// GatewayIterator manages a stream of *apigatewaypb.Gateway.
type GatewayIterator struct {
	items    []*apigatewaypb.Gateway
	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 []*apigatewaypb.Gateway, nextPageToken string, err error)
}

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

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

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