discoveryengine/apiv1beta/engine_client.go

// Copyright 2026 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 discoveryengine

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

	discoveryenginepb "cloud.google.com/go/discoveryengine/apiv1beta/discoveryenginepb"
	iampb "cloud.google.com/go/iam/apiv1/iampb"
	"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"
	"github.com/googleapis/gax-go/v2/callctx"
	trace "go.opentelemetry.io/otel/trace"
	"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 newEngineClientHook clientHook

// EngineCallOptions contains the retry settings for each method of EngineClient.
type EngineCallOptions struct {
	CreateEngine    []gax.CallOption
	DeleteEngine    []gax.CallOption
	UpdateEngine    []gax.CallOption
	GetEngine       []gax.CallOption
	ListEngines     []gax.CallOption
	PauseEngine     []gax.CallOption
	ResumeEngine    []gax.CallOption
	TuneEngine      []gax.CallOption
	GetIamPolicy    []gax.CallOption
	SetIamPolicy    []gax.CallOption
	CancelOperation []gax.CallOption
	GetOperation    []gax.CallOption
	ListOperations  []gax.CallOption
}

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

func defaultEngineCallOptions() *EngineCallOptions {
	return &EngineCallOptions{
		CreateEngine: []gax.CallOption{},
		DeleteEngine: []gax.CallOption{},
		UpdateEngine: []gax.CallOption{},
		GetEngine:    []gax.CallOption{},
		ListEngines:  []gax.CallOption{},
		PauseEngine:  []gax.CallOption{},
		ResumeEngine: []gax.CallOption{},
		TuneEngine:   []gax.CallOption{},
		GetIamPolicy: []gax.CallOption{},
		SetIamPolicy: []gax.CallOption{},
		CancelOperation: []gax.CallOption{
			gax.WithTimeout(30000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        10000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		GetOperation: []gax.CallOption{
			gax.WithTimeout(30000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        10000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
		ListOperations: []gax.CallOption{
			gax.WithTimeout(300000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnCodes([]codes.Code{
					codes.Unavailable,
				}, gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				})
			}),
		},
	}
}

func defaultEngineRESTCallOptions() *EngineCallOptions {
	return &EngineCallOptions{
		CreateEngine: []gax.CallOption{},
		DeleteEngine: []gax.CallOption{},
		UpdateEngine: []gax.CallOption{},
		GetEngine:    []gax.CallOption{},
		ListEngines:  []gax.CallOption{},
		PauseEngine:  []gax.CallOption{},
		ResumeEngine: []gax.CallOption{},
		TuneEngine:   []gax.CallOption{},
		GetIamPolicy: []gax.CallOption{},
		SetIamPolicy: []gax.CallOption{},
		CancelOperation: []gax.CallOption{
			gax.WithTimeout(30000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        10000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable)
			}),
		},
		GetOperation: []gax.CallOption{
			gax.WithTimeout(30000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        10000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable)
			}),
		},
		ListOperations: []gax.CallOption{
			gax.WithTimeout(300000 * time.Millisecond),
			gax.WithRetry(func() gax.Retryer {
				return gax.OnHTTPCodes(gax.Backoff{
					Initial:    1000 * time.Millisecond,
					Max:        30000 * time.Millisecond,
					Multiplier: 1.30,
				},
					http.StatusServiceUnavailable)
			}),
		},
	}
}

// internalEngineClient is an interface that defines the methods available from Discovery Engine API.
type internalEngineClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	CreateEngine(context.Context, *discoveryenginepb.CreateEngineRequest, ...gax.CallOption) (*CreateEngineOperation, error)
	CreateEngineOperation(name string) *CreateEngineOperation
	DeleteEngine(context.Context, *discoveryenginepb.DeleteEngineRequest, ...gax.CallOption) (*DeleteEngineOperation, error)
	DeleteEngineOperation(name string) *DeleteEngineOperation
	UpdateEngine(context.Context, *discoveryenginepb.UpdateEngineRequest, ...gax.CallOption) (*discoveryenginepb.Engine, error)
	GetEngine(context.Context, *discoveryenginepb.GetEngineRequest, ...gax.CallOption) (*discoveryenginepb.Engine, error)
	ListEngines(context.Context, *discoveryenginepb.ListEnginesRequest, ...gax.CallOption) *EngineIterator
	PauseEngine(context.Context, *discoveryenginepb.PauseEngineRequest, ...gax.CallOption) (*discoveryenginepb.Engine, error)
	ResumeEngine(context.Context, *discoveryenginepb.ResumeEngineRequest, ...gax.CallOption) (*discoveryenginepb.Engine, error)
	TuneEngine(context.Context, *discoveryenginepb.TuneEngineRequest, ...gax.CallOption) (*TuneEngineOperation, error)
	TuneEngineOperation(name string) *TuneEngineOperation
	GetIamPolicy(context.Context, *iampb.GetIamPolicyRequest, ...gax.CallOption) (*iampb.Policy, error)
	SetIamPolicy(context.Context, *iampb.SetIamPolicyRequest, ...gax.CallOption) (*iampb.Policy, error)
	CancelOperation(context.Context, *longrunningpb.CancelOperationRequest, ...gax.CallOption) error
	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
}

// EngineClient is a client for interacting with Discovery Engine API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// Service for managing Engine
// configuration.
type EngineClient struct {
	// The internal transport-dependent client.
	internalClient internalEngineClient

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

	// 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. **Always** call Close() when
// the client is no longer required.
func (c *EngineClient) 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 *EngineClient) 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 *EngineClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// CreateEngine creates an Engine.
func (c *EngineClient) CreateEngine(ctx context.Context, req *discoveryenginepb.CreateEngineRequest, opts ...gax.CallOption) (*CreateEngineOperation, error) {
	return c.internalClient.CreateEngine(ctx, req, opts...)
}

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

// DeleteEngine deletes an Engine.
func (c *EngineClient) DeleteEngine(ctx context.Context, req *discoveryenginepb.DeleteEngineRequest, opts ...gax.CallOption) (*DeleteEngineOperation, error) {
	return c.internalClient.DeleteEngine(ctx, req, opts...)
}

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

// UpdateEngine updates an Engine
func (c *EngineClient) UpdateEngine(ctx context.Context, req *discoveryenginepb.UpdateEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	return c.internalClient.UpdateEngine(ctx, req, opts...)
}

// GetEngine gets an Engine.
func (c *EngineClient) GetEngine(ctx context.Context, req *discoveryenginepb.GetEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	return c.internalClient.GetEngine(ctx, req, opts...)
}

// ListEngines lists all the Engines
// associated with the project.
func (c *EngineClient) ListEngines(ctx context.Context, req *discoveryenginepb.ListEnginesRequest, opts ...gax.CallOption) *EngineIterator {
	return c.internalClient.ListEngines(ctx, req, opts...)
}

// PauseEngine pauses the training of an existing
// Engine. Only applicable if
// SolutionType is
// SOLUTION_TYPE_RECOMMENDATION.
func (c *EngineClient) PauseEngine(ctx context.Context, req *discoveryenginepb.PauseEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	return c.internalClient.PauseEngine(ctx, req, opts...)
}

// ResumeEngine resumes the training of an existing
// Engine. Only applicable if
// SolutionType is
// SOLUTION_TYPE_RECOMMENDATION.
func (c *EngineClient) ResumeEngine(ctx context.Context, req *discoveryenginepb.ResumeEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	return c.internalClient.ResumeEngine(ctx, req, opts...)
}

// TuneEngine tunes an existing Engine.
// Only applicable if
// SolutionType is
// SOLUTION_TYPE_RECOMMENDATION.
func (c *EngineClient) TuneEngine(ctx context.Context, req *discoveryenginepb.TuneEngineRequest, opts ...gax.CallOption) (*TuneEngineOperation, error) {
	return c.internalClient.TuneEngine(ctx, req, opts...)
}

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

// GetIamPolicy gets the IAM access control policy for an
// Engine. A NOT_FOUND error
// is returned if the resource does not exist. An empty policy is returned if
// the resource exists but does not have a policy set on it.
func (c *EngineClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	return c.internalClient.GetIamPolicy(ctx, req, opts...)
}

// SetIamPolicy sets the IAM access control policy for an
// Engine. A NOT_FOUND error
// is returned if the resource does not exist.
//
// Important: When setting a policy directly on an Engine resource,
// the only recommended roles in the bindings are:
// roles/discoveryengine.admin,
// roles/discoveryengine.agentspaceAdmin,
// roles/discoveryengine.user,
// roles/discoveryengine.agentspaceUser,
// roles/discoveryengine.viewer,
// roles/discoveryengine.agentspaceViewer.
// Attempting to grant any other role will result in a warning in logging.
func (c *EngineClient) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	return c.internalClient.SetIamPolicy(ctx, req, opts...)
}

// CancelOperation is a utility method from google.longrunning.Operations.
func (c *EngineClient) CancelOperation(ctx context.Context, req *longrunningpb.CancelOperationRequest, opts ...gax.CallOption) error {
	return c.internalClient.CancelOperation(ctx, req, opts...)
}

// GetOperation is a utility method from google.longrunning.Operations.
func (c *EngineClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	return c.internalClient.GetOperation(ctx, req, opts...)
}

// ListOperations is a utility method from google.longrunning.Operations.
func (c *EngineClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	return c.internalClient.ListOperations(ctx, req, opts...)
}

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

	// Points back to the CallOptions field of the containing EngineClient
	CallOptions **EngineCallOptions

	// The gRPC API client.
	engineClient discoveryenginepb.EngineServiceClient

	// 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

	operationsClient longrunningpb.OperationsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogHeaders []string

	logger *slog.Logger
}

// NewEngineClient creates a new engine service client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// Service for managing Engine
// configuration.
func NewEngineClient(ctx context.Context, opts ...option.ClientOption) (*EngineClient, error) {
	clientOpts := defaultEngineGRPCClientOptions()
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		clientOpts = append(clientOpts, internaloption.WithTelemetryAttributes(map[string]string{
			"gcp.client.service":  "discoveryengine",
			"gcp.client.version":  getVersionClient(),
			"gcp.client.repo":     "googleapis/google-cloud-go",
			"gcp.client.artifact": "cloud.google.com/go/discoveryengine/apiv1beta",
			"gcp.client.language": "go",
			"url.domain":          "discoveryengine.googleapis.com",
		}))
	}
	if newEngineClientHook != nil {
		hookOpts, err := newEngineClientHook(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 := EngineClient{CallOptions: defaultEngineCallOptions()}

	c := &engineGRPCClient{
		connPool:         connPool,
		engineClient:     discoveryenginepb.NewEngineServiceClient(connPool),
		CallOptions:      &client.CallOptions,
		logger:           internaloption.GetLogger(opts),
		operationsClient: longrunningpb.NewOperationsClient(connPool),
	}
	c.setGoogleClientInfo()
	if gax.IsFeatureEnabled("METRICS") {
		metrics := gax.NewClientMetrics(
			gax.WithTelemetryLogger(c.logger),
			gax.WithTelemetryAttributes(map[string]string{
				gax.ClientService:  "discoveryengine",
				gax.ClientVersion:  getVersionClient(),
				gax.ClientArtifact: "cloud.google.com/go/discoveryengine/apiv1beta",
				gax.RPCSystem:      "grpc",
				gax.URLDomain:      "discoveryengine.googleapis.com",
			}),
		)

		client.CallOptions.CreateEngine = append(client.CallOptions.CreateEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.DeleteEngine = append(client.CallOptions.DeleteEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.UpdateEngine = append(client.CallOptions.UpdateEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.GetEngine = append(client.CallOptions.GetEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.ListEngines = append(client.CallOptions.ListEngines, gax.WithClientMetrics(metrics))
		client.CallOptions.PauseEngine = append(client.CallOptions.PauseEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.ResumeEngine = append(client.CallOptions.ResumeEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.TuneEngine = append(client.CallOptions.TuneEngine, gax.WithClientMetrics(metrics))
		client.CallOptions.GetIamPolicy = append(client.CallOptions.GetIamPolicy, gax.WithClientMetrics(metrics))
		client.CallOptions.SetIamPolicy = append(client.CallOptions.SetIamPolicy, gax.WithClientMetrics(metrics))
		client.CallOptions.CancelOperation = append(client.CallOptions.CancelOperation, gax.WithClientMetrics(metrics))
		client.CallOptions.GetOperation = append(client.CallOptions.GetOperation, gax.WithClientMetrics(metrics))
		client.CallOptions.ListOperations = append(client.CallOptions.ListOperations, gax.WithClientMetrics(metrics))
	}

	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 *engineGRPCClient) 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 *engineGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version, "pb", protoVersion)
	c.xGoogHeaders = []string{
		"x-goog-api-client", gax.XGoogHeader(kv...),
	}
}

// Close closes the connection to the API service. **Always** call Close() when
// the client is no longer required.
func (c *engineGRPCClient) Close() error {
	return c.connPool.Close()
}

// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type engineRESTClient 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 EngineClient
	CallOptions **EngineCallOptions

	logger *slog.Logger
}

// NewEngineRESTClient creates a new engine service rest client.
//
// Service for managing Engine
// configuration.
func NewEngineRESTClient(ctx context.Context, opts ...option.ClientOption) (*EngineClient, error) {
	clientOpts := append(defaultEngineRESTClientOptions(), opts...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		clientOpts = append(clientOpts, internaloption.WithTelemetryAttributes(map[string]string{
			"gcp.client.service":  "discoveryengine",
			"gcp.client.version":  getVersionClient(),
			"gcp.client.repo":     "googleapis/google-cloud-go",
			"gcp.client.artifact": "cloud.google.com/go/discoveryengine/apiv1beta",
			"gcp.client.language": "go",
			"url.domain":          "discoveryengine.googleapis.com",
		}))
	}
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
		return nil, err
	}

	callOpts := defaultEngineRESTCallOptions()
	c := &engineRESTClient{
		endpoint:    endpoint,
		httpClient:  httpClient,
		CallOptions: &callOpts,
		logger:      internaloption.GetLogger(opts),
	}
	c.setGoogleClientInfo()

	if gax.IsFeatureEnabled("METRICS") {
		metrics := gax.NewClientMetrics(
			gax.WithTelemetryLogger(c.logger),
			gax.WithTelemetryAttributes(map[string]string{
				gax.ClientService:  "discoveryengine",
				gax.ClientVersion:  getVersionClient(),
				gax.ClientArtifact: "cloud.google.com/go/discoveryengine/apiv1beta",
				gax.RPCSystem:      "http",
				gax.URLDomain:      "discoveryengine.googleapis.com",
			}),
		)

		callOpts.CreateEngine = append(callOpts.CreateEngine, gax.WithClientMetrics(metrics))
		callOpts.DeleteEngine = append(callOpts.DeleteEngine, gax.WithClientMetrics(metrics))
		callOpts.UpdateEngine = append(callOpts.UpdateEngine, gax.WithClientMetrics(metrics))
		callOpts.GetEngine = append(callOpts.GetEngine, gax.WithClientMetrics(metrics))
		callOpts.ListEngines = append(callOpts.ListEngines, gax.WithClientMetrics(metrics))
		callOpts.PauseEngine = append(callOpts.PauseEngine, gax.WithClientMetrics(metrics))
		callOpts.ResumeEngine = append(callOpts.ResumeEngine, gax.WithClientMetrics(metrics))
		callOpts.TuneEngine = append(callOpts.TuneEngine, gax.WithClientMetrics(metrics))
		callOpts.GetIamPolicy = append(callOpts.GetIamPolicy, gax.WithClientMetrics(metrics))
		callOpts.SetIamPolicy = append(callOpts.SetIamPolicy, gax.WithClientMetrics(metrics))
		callOpts.CancelOperation = append(callOpts.CancelOperation, gax.WithClientMetrics(metrics))
		callOpts.GetOperation = append(callOpts.GetOperation, gax.WithClientMetrics(metrics))
		callOpts.ListOperations = append(callOpts.ListOperations, gax.WithClientMetrics(metrics))
	}

	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 &EngineClient{internalClient: c, CallOptions: callOpts}, nil
}

func defaultEngineRESTClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("https://discoveryengine.googleapis.com"),
		internaloption.WithDefaultEndpointTemplate("https://discoveryengine.UNIVERSE_DOMAIN"),
		internaloption.WithDefaultMTLSEndpoint("https://discoveryengine.mtls.googleapis.com"),
		internaloption.WithDefaultUniverseDomain("googleapis.com"),
		internaloption.WithDefaultAudience("https://discoveryengine.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableNewAuthLibrary(),
	}
}

// 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 *engineRESTClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN", "pb", protoVersion)
	c.xGoogHeaders = []string{
		"x-goog-api-client", gax.XGoogHeader(kv...),
	}
}

// Close closes the connection to the API service. **Always** call Close() when
// the client is no longer required.
func (c *engineRESTClient) 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 *engineRESTClient) Connection() *grpc.ClientConn {
	return nil
}
func (c *engineGRPCClient) CreateEngine(ctx context.Context, req *discoveryenginepb.CreateEngineRequest, opts ...gax.CallOption) (*CreateEngineOperation, 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetParent()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/CreateEngine")
	}
	opts = append((*c.CallOptions).CreateEngine[0:len((*c.CallOptions).CreateEngine):len((*c.CallOptions).CreateEngine)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.CreateEngine, req, settings.GRPC, c.logger, "CreateEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	lro := longrunning.InternalNewOperationWithMetadata(*c.LROClient, resp, "*discoveryengine.CreateEngineOperation")
	if gax.IsFeatureEnabled("TRACING") {
		lro.SetParentSpanContext(trace.SpanContextFromContext(ctx))
	}
	return &CreateEngineOperation{
		lro: lro,
	}, nil
}

func (c *engineGRPCClient) DeleteEngine(ctx context.Context, req *discoveryenginepb.DeleteEngineRequest, opts ...gax.CallOption) (*DeleteEngineOperation, 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/DeleteEngine")
	}
	opts = append((*c.CallOptions).DeleteEngine[0:len((*c.CallOptions).DeleteEngine):len((*c.CallOptions).DeleteEngine)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.DeleteEngine, req, settings.GRPC, c.logger, "DeleteEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	lro := longrunning.InternalNewOperationWithMetadata(*c.LROClient, resp, "*discoveryengine.DeleteEngineOperation")
	if gax.IsFeatureEnabled("TRACING") {
		lro.SetParentSpanContext(trace.SpanContextFromContext(ctx))
	}
	return &DeleteEngineOperation{
		lro: lro,
	}, nil
}

func (c *engineGRPCClient) UpdateEngine(ctx context.Context, req *discoveryenginepb.UpdateEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "engine.name", url.QueryEscape(req.GetEngine().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/UpdateEngine")
	}
	opts = append((*c.CallOptions).UpdateEngine[0:len((*c.CallOptions).UpdateEngine):len((*c.CallOptions).UpdateEngine)], opts...)
	var resp *discoveryenginepb.Engine
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.UpdateEngine, req, settings.GRPC, c.logger, "UpdateEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) GetEngine(ctx context.Context, req *discoveryenginepb.GetEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/GetEngine")
	}
	opts = append((*c.CallOptions).GetEngine[0:len((*c.CallOptions).GetEngine):len((*c.CallOptions).GetEngine)], opts...)
	var resp *discoveryenginepb.Engine
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.GetEngine, req, settings.GRPC, c.logger, "GetEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) ListEngines(ctx context.Context, req *discoveryenginepb.ListEnginesRequest, opts ...gax.CallOption) *EngineIterator {
	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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetParent()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/ListEngines")
	}
	opts = append((*c.CallOptions).ListEngines[0:len((*c.CallOptions).ListEngines):len((*c.CallOptions).ListEngines)], opts...)
	it := &EngineIterator{}
	req = proto.CloneOf(req)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*discoveryenginepb.Engine, string, error) {
		resp := &discoveryenginepb.ListEnginesResponse{}
		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 = executeRPC(ctx, c.engineClient.ListEngines, req, settings.GRPC, c.logger, "ListEngines")
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetEngines(), 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 *engineGRPCClient) PauseEngine(ctx context.Context, req *discoveryenginepb.PauseEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/PauseEngine")
	}
	opts = append((*c.CallOptions).PauseEngine[0:len((*c.CallOptions).PauseEngine):len((*c.CallOptions).PauseEngine)], opts...)
	var resp *discoveryenginepb.Engine
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.PauseEngine, req, settings.GRPC, c.logger, "PauseEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) ResumeEngine(ctx context.Context, req *discoveryenginepb.ResumeEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/ResumeEngine")
	}
	opts = append((*c.CallOptions).ResumeEngine[0:len((*c.CallOptions).ResumeEngine):len((*c.CallOptions).ResumeEngine)], opts...)
	var resp *discoveryenginepb.Engine
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.ResumeEngine, req, settings.GRPC, c.logger, "ResumeEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) TuneEngine(ctx context.Context, req *discoveryenginepb.TuneEngineRequest, opts ...gax.CallOption) (*TuneEngineOperation, 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/TuneEngine")
	}
	opts = append((*c.CallOptions).TuneEngine[0:len((*c.CallOptions).TuneEngine):len((*c.CallOptions).TuneEngine)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.TuneEngine, req, settings.GRPC, c.logger, "TuneEngine")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	lro := longrunning.InternalNewOperationWithMetadata(*c.LROClient, resp, "*discoveryengine.TuneEngineOperation")
	if gax.IsFeatureEnabled("TRACING") {
		lro.SetParentSpanContext(trace.SpanContextFromContext(ctx))
	}
	return &TuneEngineOperation{
		lro: lro,
	}, nil
}

func (c *engineGRPCClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetResource()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/GetIamPolicy")
	}
	opts = append((*c.CallOptions).GetIamPolicy[0:len((*c.CallOptions).GetIamPolicy):len((*c.CallOptions).GetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.GetIamPolicy, req, settings.GRPC, c.logger, "GetIamPolicy")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetResource()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/SetIamPolicy")
	}
	opts = append((*c.CallOptions).SetIamPolicy[0:len((*c.CallOptions).SetIamPolicy):len((*c.CallOptions).SetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.engineClient.SetIamPolicy, req, settings.GRPC, c.logger, "SetIamPolicy")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) CancelOperation(ctx context.Context, req *longrunningpb.CancelOperationRequest, opts ...gax.CallOption) 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...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/CancelOperation")
	}
	opts = append((*c.CallOptions).CancelOperation[0:len((*c.CallOptions).CancelOperation):len((*c.CallOptions).CancelOperation)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = executeRPC(ctx, c.operationsClient.CancelOperation, req, settings.GRPC, c.logger, "CancelOperation")
		return err
	}, opts...)
	return err
}

func (c *engineGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, 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...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/GetOperation")
	}
	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = executeRPC(ctx, c.operationsClient.GetOperation, req, settings.GRPC, c.logger, "GetOperation")
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *engineGRPCClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	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...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/ListOperations")
	}
	opts = append((*c.CallOptions).ListOperations[0:len((*c.CallOptions).ListOperations):len((*c.CallOptions).ListOperations)], opts...)
	it := &OperationIterator{}
	req = proto.CloneOf(req)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
		resp := &longrunningpb.ListOperationsResponse{}
		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 = executeRPC(ctx, c.operationsClient.ListOperations, req, settings.GRPC, c.logger, "ListOperations")
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetOperations(), 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
}

// CreateEngine creates an Engine.
func (c *engineRESTClient) CreateEngine(ctx context.Context, req *discoveryenginepb.CreateEngineRequest, opts ...gax.CallOption) (*CreateEngineOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetEngine()
	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("/v1beta/%v/engines", req.GetParent())

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

	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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetParent()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/CreateEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{parent=projects/*/locations/*/collections/*}/engines")
	}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "CreateEngine")
		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("/v1beta/%s", resp.GetName())
	lro := longrunning.InternalNewOperationWithMetadata(*c.LROClient, resp, "*discoveryengine.CreateEngineOperation")
	if gax.IsFeatureEnabled("TRACING") {
		lro.SetParentSpanContext(trace.SpanContextFromContext(ctx))
	}
	return &CreateEngineOperation{
		lro:      lro,
		pollPath: override,
	}, nil
}

// DeleteEngine deletes an Engine.
func (c *engineRESTClient) DeleteEngine(ctx context.Context, req *discoveryenginepb.DeleteEngineRequest, opts ...gax.CallOption) (*DeleteEngineOperation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/DeleteEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/engines/*}")
	}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "DeleteEngine")
		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("/v1beta/%s", resp.GetName())
	lro := longrunning.InternalNewOperationWithMetadata(*c.LROClient, resp, "*discoveryengine.DeleteEngineOperation")
	if gax.IsFeatureEnabled("TRACING") {
		lro.SetParentSpanContext(trace.SpanContextFromContext(ctx))
	}
	return &DeleteEngineOperation{
		lro:      lro,
		pollPath: override,
	}, nil
}

// UpdateEngine updates an Engine
func (c *engineRESTClient) UpdateEngine(ctx context.Context, req *discoveryenginepb.UpdateEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	body := req.GetEngine()
	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("/v1beta/%v", req.GetEngine().GetName())

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

	baseUrl.RawQuery = params.Encode()

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

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/UpdateEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{engine.name=projects/*/locations/*/collections/*/engines/*}")
	}
	opts = append((*c.CallOptions).UpdateEngine[0:len((*c.CallOptions).UpdateEngine):len((*c.CallOptions).UpdateEngine)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &discoveryenginepb.Engine{}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "UpdateEngine")
		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
}

// GetEngine gets an Engine.
func (c *engineRESTClient) GetEngine(ctx context.Context, req *discoveryenginepb.GetEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/GetEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/engines/*}")
	}
	opts = append((*c.CallOptions).GetEngine[0:len((*c.CallOptions).GetEngine):len((*c.CallOptions).GetEngine)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &discoveryenginepb.Engine{}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "GetEngine")
		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
}

// ListEngines lists all the Engines
// associated with the project.
func (c *engineRESTClient) ListEngines(ctx context.Context, req *discoveryenginepb.ListEnginesRequest, opts ...gax.CallOption) *EngineIterator {
	it := &EngineIterator{}
	req = proto.CloneOf(req)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*discoveryenginepb.Engine, string, error) {
		resp := &discoveryenginepb.ListEnginesResponse{}
		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("/v1beta/%v/engines", 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.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

			buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "ListEngines")
			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.GetEngines(), 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
}

// PauseEngine pauses the training of an existing
// Engine. Only applicable if
// SolutionType is
// SOLUTION_TYPE_RECOMMENDATION.
func (c *engineRESTClient) PauseEngine(ctx context.Context, req *discoveryenginepb.PauseEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%v:pause", 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/PauseEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/engines/*}:pause")
	}
	opts = append((*c.CallOptions).PauseEngine[0:len((*c.CallOptions).PauseEngine):len((*c.CallOptions).PauseEngine)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &discoveryenginepb.Engine{}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "PauseEngine")
		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
}

// ResumeEngine resumes the training of an existing
// Engine. Only applicable if
// SolutionType is
// SOLUTION_TYPE_RECOMMENDATION.
func (c *engineRESTClient) ResumeEngine(ctx context.Context, req *discoveryenginepb.ResumeEngineRequest, opts ...gax.CallOption) (*discoveryenginepb.Engine, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%v:resume", 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/ResumeEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/engines/*}:resume")
	}
	opts = append((*c.CallOptions).ResumeEngine[0:len((*c.CallOptions).ResumeEngine):len((*c.CallOptions).ResumeEngine)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &discoveryenginepb.Engine{}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "ResumeEngine")
		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
}

// TuneEngine tunes an existing Engine.
// Only applicable if
// SolutionType is
// SOLUTION_TYPE_RECOMMENDATION.
func (c *engineRESTClient) TuneEngine(ctx context.Context, req *discoveryenginepb.TuneEngineRequest, opts ...gax.CallOption) (*TuneEngineOperation, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%v:tune", 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...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetName()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/TuneEngine")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/engines/*}:tune")
	}
	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

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "TuneEngine")
		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("/v1beta/%s", resp.GetName())
	lro := longrunning.InternalNewOperationWithMetadata(*c.LROClient, resp, "*discoveryengine.TuneEngineOperation")
	if gax.IsFeatureEnabled("TRACING") {
		lro.SetParentSpanContext(trace.SpanContextFromContext(ctx))
	}
	return &TuneEngineOperation{
		lro:      lro,
		pollPath: override,
	}, nil
}

// GetIamPolicy gets the IAM access control policy for an
// Engine. A NOT_FOUND error
// is returned if the resource does not exist. An empty policy is returned if
// the resource exists but does not have a policy set on it.
func (c *engineRESTClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%v:getIamPolicy", req.GetResource())

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

	baseUrl.RawQuery = params.Encode()

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

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetResource()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/GetIamPolicy")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{resource=projects/*/locations/*/collections/*/engines/*}:getIamPolicy")
	}
	opts = append((*c.CallOptions).GetIamPolicy[0:len((*c.CallOptions).GetIamPolicy):len((*c.CallOptions).GetIamPolicy)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &iampb.Policy{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("GET", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "GetIamPolicy")
		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
}

// SetIamPolicy sets the IAM access control policy for an
// Engine. A NOT_FOUND error
// is returned if the resource does not exist.
//
// Important: When setting a policy directly on an Engine resource,
// the only recommended roles in the bindings are:
// roles/discoveryengine.admin,
// roles/discoveryengine.agentspaceAdmin,
// roles/discoveryengine.user,
// roles/discoveryengine.agentspaceUser,
// roles/discoveryengine.viewer,
// roles/discoveryengine.agentspaceViewer.
// Attempting to grant any other role will result in a warning in logging.
func (c *engineRESTClient) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return nil, err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%v:setIamPolicy", req.GetResource())

	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", "resource", url.QueryEscape(req.GetResource()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	if gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "resource_name", fmt.Sprintf("//discoveryengine.googleapis.com/%v", req.GetResource()))
	}
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.cloud.discoveryengine.v1beta.EngineService/SetIamPolicy")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{resource=projects/*/locations/*/collections/*/engines/*}:setIamPolicy")
	}
	opts = append((*c.CallOptions).SetIamPolicy[0:len((*c.CallOptions).SetIamPolicy):len((*c.CallOptions).SetIamPolicy)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &iampb.Policy{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		if settings.Path != "" {
			baseUrl.Path = settings.Path
		}
		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "SetIamPolicy")
		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
}

// CancelOperation is a utility method from google.longrunning.Operations.
func (c *engineRESTClient) CancelOperation(ctx context.Context, req *longrunningpb.CancelOperationRequest, opts ...gax.CallOption) error {
	m := protojson.MarshalOptions{AllowPartial: true, UseEnumNumbers: true}
	jsonReq, err := m.Marshal(req)
	if err != nil {
		return err
	}

	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%v:cancel", 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...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/CancelOperation")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/dataStores/*/branches/*/operations/*}:cancel")
	}
	return 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

		_, err = executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, jsonReq, "CancelOperation")
		return err
	}, opts...)
}

// GetOperation is a utility method from google.longrunning.Operations.
func (c *engineRESTClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	baseUrl, err := url.Parse(c.endpoint)
	if err != nil {
		return nil, err
	}
	baseUrl.Path += fmt.Sprintf("/v1beta/%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...)
	if gax.IsFeatureEnabled("METRICS") || gax.IsFeatureEnabled("TRACING") || gax.IsFeatureEnabled("LOGGING") {
		ctx = callctx.WithTelemetryContext(ctx, "rpc_method", "google.longrunning.Operations/GetOperation")
		ctx = callctx.WithTelemetryContext(ctx, "url_template", "/v1beta/{name=projects/*/locations/*/collections/*/dataConnector/operations/*}")
	}
	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	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("GET", baseUrl.String(), nil)
		if err != nil {
			return err
		}
		httpReq = httpReq.WithContext(ctx)
		httpReq.Header = headers

		buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "GetOperation")
		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
}

// ListOperations is a utility method from google.longrunning.Operations.
func (c *engineRESTClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	it := &OperationIterator{}
	req = proto.CloneOf(req)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
		resp := &longrunningpb.ListOperationsResponse{}
		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("/v1beta/%v/operations", req.GetName())

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

		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

			buf, err := executeHTTPRequest(ctx, c.httpClient, httpReq, c.logger, nil, "ListOperations")
			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.GetOperations(), 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
}

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

// CreateEngineOperation returns a new CreateEngineOperation from a given name.
// The name must be that of a previously created CreateEngineOperation, possibly from a different process.
func (c *engineRESTClient) CreateEngineOperation(name string) *CreateEngineOperation {
	override := fmt.Sprintf("/v1beta/%s", name)
	return &CreateEngineOperation{
		lro:      longrunning.InternalNewOperationWithMetadata(*c.LROClient, &longrunningpb.Operation{Name: name}, "*discoveryengine.CreateEngineOperation"),
		pollPath: override,
	}
}

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

// DeleteEngineOperation returns a new DeleteEngineOperation from a given name.
// The name must be that of a previously created DeleteEngineOperation, possibly from a different process.
func (c *engineRESTClient) DeleteEngineOperation(name string) *DeleteEngineOperation {
	override := fmt.Sprintf("/v1beta/%s", name)
	return &DeleteEngineOperation{
		lro:      longrunning.InternalNewOperationWithMetadata(*c.LROClient, &longrunningpb.Operation{Name: name}, "*discoveryengine.DeleteEngineOperation"),
		pollPath: override,
	}
}

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

// TuneEngineOperation returns a new TuneEngineOperation from a given name.
// The name must be that of a previously created TuneEngineOperation, possibly from a different process.
func (c *engineRESTClient) TuneEngineOperation(name string) *TuneEngineOperation {
	override := fmt.Sprintf("/v1beta/%s", name)
	return &TuneEngineOperation{
		lro:      longrunning.InternalNewOperationWithMetadata(*c.LROClient, &longrunningpb.Operation{Name: name}, "*discoveryengine.TuneEngineOperation"),
		pollPath: override,
	}
}