eventarc/publishing/apiv1/publisher_client.go - gocloud - Git at Google

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

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

 package publishing

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

 	publishingpb "cloud.google.com/go/eventarc/publishing/apiv1/publishingpb"
 	gax "github.com/googleapis/gax-go/v2"
 	"google.golang.org/api/googleapi"
 	"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/protobuf/encoding/protojson"
 )

 var newPublisherClientHook clientHook

 // PublisherCallOptions contains the retry settings for each method of PublisherClient.
 type PublisherCallOptions struct {
 	PublishChannelConnectionEvents []gax.CallOption
 	PublishEvents                  []gax.CallOption
 }

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

 func defaultPublisherCallOptions() *PublisherCallOptions {
 	return &PublisherCallOptions{
 		PublishChannelConnectionEvents: []gax.CallOption{
 			gax.WithTimeout(60000 * time.Millisecond),
 		},
 		PublishEvents: []gax.CallOption{},
 	}
 }

 func defaultPublisherRESTCallOptions() *PublisherCallOptions {
 	return &PublisherCallOptions{
 		PublishChannelConnectionEvents: []gax.CallOption{
 			gax.WithTimeout(60000 * time.Millisecond),
 		},
 		PublishEvents: []gax.CallOption{},
 	}
 }

 // internalPublisherClient is an interface that defines the methods available from Eventarc Publishing API.
 type internalPublisherClient interface {
 	Close() error
 	setGoogleClientInfo(...string)
 	Connection() *grpc.ClientConn
 	PublishChannelConnectionEvents(context.Context, *publishingpb.PublishChannelConnectionEventsRequest, ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, error)
 	PublishEvents(context.Context, *publishingpb.PublishEventsRequest, ...gax.CallOption) (*publishingpb.PublishEventsResponse, error)
 }

 // PublisherClient is a client for interacting with Eventarc Publishing API.
 // Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
 //
 // Eventarc processes events generated by an event provider and delivers them to
 // a subscriber.
 //
 // An event provider is a software-as-a-service (SaaS) system or
 // product that can generate and deliver events through Eventarc.
 //
 // A third-party event provider is an event provider from outside of Google.
 //
 // A partner is a third-party event provider that is integrated with Eventarc.
 //
 // A subscriber is a GCP customer interested in receiving events.
 //
 // Channel is a first-class Eventarc resource that is created and managed
 // by the subscriber in their GCP project. A Channel represents a subscriber’s
 // intent to receive events from an event provider. A Channel is associated with
 // exactly one event provider.
 //
 // ChannelConnection is a first-class Eventarc resource that
 // is created and managed by the partner in their GCP project. A
 // ChannelConnection represents a connection between a partner and a
 // subscriber’s Channel. A ChannelConnection has a one-to-one mapping with a
 // Channel.
 //
 // Publisher allows an event provider to publish events to Eventarc.
 type PublisherClient struct {
 	// The internal transport-dependent client.
 	internalClient internalPublisherClient

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

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

 // PublishChannelConnectionEvents publish events to a ChannelConnection in a partner’s project.
 func (c *PublisherClient) PublishChannelConnectionEvents(ctx context.Context, req *publishingpb.PublishChannelConnectionEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, error) {
 	return c.internalClient.PublishChannelConnectionEvents(ctx, req, opts...)
 }

 // PublishEvents publish events to a subscriber’s channel.
 func (c *PublisherClient) PublishEvents(ctx context.Context, req *publishingpb.PublishEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishEventsResponse, error) {
 	return c.internalClient.PublishEvents(ctx, req, opts...)
 }

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

 	// Points back to the CallOptions field of the containing PublisherClient
 	CallOptions **PublisherCallOptions

 	// The gRPC API client.
 	publisherClient publishingpb.PublisherClient

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

 // NewPublisherClient creates a new publisher client based on gRPC.
 // The returned client must be Closed when it is done being used to clean up its underlying connections.
 //
 // Eventarc processes events generated by an event provider and delivers them to
 // a subscriber.
 //
 // An event provider is a software-as-a-service (SaaS) system or
 // product that can generate and deliver events through Eventarc.
 //
 // A third-party event provider is an event provider from outside of Google.
 //
 // A partner is a third-party event provider that is integrated with Eventarc.
 //
 // A subscriber is a GCP customer interested in receiving events.
 //
 // Channel is a first-class Eventarc resource that is created and managed
 // by the subscriber in their GCP project. A Channel represents a subscriber’s
 // intent to receive events from an event provider. A Channel is associated with
 // exactly one event provider.
 //
 // ChannelConnection is a first-class Eventarc resource that
 // is created and managed by the partner in their GCP project. A
 // ChannelConnection represents a connection between a partner and a
 // subscriber’s Channel. A ChannelConnection has a one-to-one mapping with a
 // Channel.
 //
 // Publisher allows an event provider to publish events to Eventarc.
 func NewPublisherClient(ctx context.Context, opts ...option.ClientOption) (*PublisherClient, error) {
 	clientOpts := defaultPublisherGRPCClientOptions()
 	if newPublisherClientHook != nil {
 		hookOpts, err := newPublisherClientHook(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 := PublisherClient{CallOptions: defaultPublisherCallOptions()}

 	c := &publisherGRPCClient{
 		connPool:        connPool,
 		publisherClient: publishingpb.NewPublisherClient(connPool),
 		CallOptions:     &client.CallOptions,
 	}
 	c.setGoogleClientInfo()

 	client.internalClient = c

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

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

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

 	// The http client.
 	httpClient *http.Client

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

 	// Points back to the CallOptions field of the containing PublisherClient
 	CallOptions **PublisherCallOptions
 }

 // NewPublisherRESTClient creates a new publisher rest client.
 //
 // Eventarc processes events generated by an event provider and delivers them to
 // a subscriber.
 //
 // An event provider is a software-as-a-service (SaaS) system or
 // product that can generate and deliver events through Eventarc.
 //
 // A third-party event provider is an event provider from outside of Google.
 //
 // A partner is a third-party event provider that is integrated with Eventarc.
 //
 // A subscriber is a GCP customer interested in receiving events.
 //
 // Channel is a first-class Eventarc resource that is created and managed
 // by the subscriber in their GCP project. A Channel represents a subscriber’s
 // intent to receive events from an event provider. A Channel is associated with
 // exactly one event provider.
 //
 // ChannelConnection is a first-class Eventarc resource that
 // is created and managed by the partner in their GCP project. A
 // ChannelConnection represents a connection between a partner and a
 // subscriber’s Channel. A ChannelConnection has a one-to-one mapping with a
 // Channel.
 //
 // Publisher allows an event provider to publish events to Eventarc.
 func NewPublisherRESTClient(ctx context.Context, opts ...option.ClientOption) (*PublisherClient, error) {
 	clientOpts := append(defaultPublisherRESTClientOptions(), opts...)
 	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
 	if err != nil {
 		return nil, err
 	}

 	callOpts := defaultPublisherRESTCallOptions()
 	c := &publisherRESTClient{
 		endpoint:    endpoint,
 		httpClient:  httpClient,
 		CallOptions: &callOpts,
 	}
 	c.setGoogleClientInfo()

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

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

 // setGoogleClientInfo sets the name and version of the application in
 // the `x-goog-api-client` header passed on each request. Intended for
 // use by Google-written clients.
 func (c *publisherRESTClient) setGoogleClientInfo(keyval ...string) {
 	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
 	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN")
 	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
 }

 // Close closes the connection to the API service. The user should invoke this when
 // the client is no longer required.
 func (c *publisherRESTClient) 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 *publisherRESTClient) Connection() *grpc.ClientConn {
 	return nil
 }
 func (c *publisherGRPCClient) PublishChannelConnectionEvents(ctx context.Context, req *publishingpb.PublishChannelConnectionEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, error) {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "channel_connection", url.QueryEscape(req.GetChannelConnection()))}

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

 func (c *publisherGRPCClient) PublishEvents(ctx context.Context, req *publishingpb.PublishEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishEventsResponse, error) {
 	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "channel", url.QueryEscape(req.GetChannel()))}

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

 // PublishChannelConnectionEvents publish events to a ChannelConnection in a partner’s project.
 func (c *publisherRESTClient) PublishChannelConnectionEvents(ctx context.Context, req *publishingpb.PublishChannelConnectionEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, 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("/v1/%v:publishEvents", req.GetChannelConnection())

 	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", "channel_connection", url.QueryEscape(req.GetChannelConnection()))}

 	hds = append(c.xGoogHeaders, hds...)
 	hds = append(hds, "Content-Type", "application/json")
 	headers := gax.BuildHeaders(ctx, hds...)
 	opts = append((*c.CallOptions).PublishChannelConnectionEvents[0:len((*c.CallOptions).PublishChannelConnectionEvents):len((*c.CallOptions).PublishChannelConnectionEvents)], opts...)
 	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
 	resp := &publishingpb.PublishChannelConnectionEventsResponse{}
 	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		if settings.Path != "" {
 			baseUrl.Path = settings.Path
 		}
 		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
 		if err != nil {
 			return err
 		}
 		httpReq = httpReq.WithContext(ctx)
 		httpReq.Header = headers

 		httpRsp, err := c.httpClient.Do(httpReq)
 		if err != nil {
 			return err
 		}
 		defer httpRsp.Body.Close()

 		if err = googleapi.CheckResponse(httpRsp); err != nil {
 			return err
 		}

 		buf, err := io.ReadAll(httpRsp.Body)
 		if err != nil {
 			return err
 		}

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

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

 // PublishEvents publish events to a subscriber’s channel.
 func (c *publisherRESTClient) PublishEvents(ctx context.Context, req *publishingpb.PublishEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishEventsResponse, 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("/v1/%v:publishEvents", req.GetChannel())

 	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", "channel", url.QueryEscape(req.GetChannel()))}

 	hds = append(c.xGoogHeaders, hds...)
 	hds = append(hds, "Content-Type", "application/json")
 	headers := gax.BuildHeaders(ctx, hds...)
 	opts = append((*c.CallOptions).PublishEvents[0:len((*c.CallOptions).PublishEvents):len((*c.CallOptions).PublishEvents)], opts...)
 	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
 	resp := &publishingpb.PublishEventsResponse{}
 	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
 		if settings.Path != "" {
 			baseUrl.Path = settings.Path
 		}
 		httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
 		if err != nil {
 			return err
 		}
 		httpReq = httpReq.WithContext(ctx)
 		httpReq.Header = headers

 		httpRsp, err := c.httpClient.Do(httpReq)
 		if err != nil {
 			return err
 		}
 		defer httpRsp.Body.Close()

 		if err = googleapi.CheckResponse(httpRsp); err != nil {
 			return err
 		}

 		buf, err := io.ReadAll(httpRsp.Body)
 		if err != nil {
 			return err
 		}

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

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

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

	package publishing

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

	publishingpb "cloud.google.com/go/eventarc/publishing/apiv1/publishingpb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/googleapi"
	"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/protobuf/encoding/protojson"
	)

	var newPublisherClientHook clientHook

	// PublisherCallOptions contains the retry settings for each method of PublisherClient.
	type PublisherCallOptions struct {
	PublishChannelConnectionEvents []gax.CallOption
	PublishEvents []gax.CallOption
	}

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

	func defaultPublisherCallOptions() *PublisherCallOptions {
	return &PublisherCallOptions{
	PublishChannelConnectionEvents: []gax.CallOption{
	gax.WithTimeout(60000 * time.Millisecond),
	},
	PublishEvents: []gax.CallOption{},
	}
	}

	func defaultPublisherRESTCallOptions() *PublisherCallOptions {
	return &PublisherCallOptions{
	PublishChannelConnectionEvents: []gax.CallOption{
	gax.WithTimeout(60000 * time.Millisecond),
	},
	PublishEvents: []gax.CallOption{},
	}
	}

	// internalPublisherClient is an interface that defines the methods available from Eventarc Publishing API.
	type internalPublisherClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	PublishChannelConnectionEvents(context.Context, publishingpb.PublishChannelConnectionEventsRequest, ...gax.CallOption) (publishingpb.PublishChannelConnectionEventsResponse, error)
	PublishEvents(context.Context, publishingpb.PublishEventsRequest, ...gax.CallOption) (publishingpb.PublishEventsResponse, error)
	}

	// PublisherClient is a client for interacting with Eventarc Publishing API.
	// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
	//
	// Eventarc processes events generated by an event provider and delivers them to
	// a subscriber.
	//
	// An event provider is a software-as-a-service (SaaS) system or
	// product that can generate and deliver events through Eventarc.
	//
	// A third-party event provider is an event provider from outside of Google.
	//
	// A partner is a third-party event provider that is integrated with Eventarc.
	//
	// A subscriber is a GCP customer interested in receiving events.
	//
	// Channel is a first-class Eventarc resource that is created and managed
	// by the subscriber in their GCP project. A Channel represents a subscriber’s
	// intent to receive events from an event provider. A Channel is associated with
	// exactly one event provider.
	//
	// ChannelConnection is a first-class Eventarc resource that
	// is created and managed by the partner in their GCP project. A
	// ChannelConnection represents a connection between a partner and a
	// subscriber’s Channel. A ChannelConnection has a one-to-one mapping with a
	// Channel.
	//
	// Publisher allows an event provider to publish events to Eventarc.
	type PublisherClient struct {
	// The internal transport-dependent client.
	internalClient internalPublisherClient

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

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

	// PublishChannelConnectionEvents publish events to a ChannelConnection in a partner’s project.
	func (c PublisherClient) PublishChannelConnectionEvents(ctx context.Context, req publishingpb.PublishChannelConnectionEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, error) {
	return c.internalClient.PublishChannelConnectionEvents(ctx, req, opts...)
	}

	// PublishEvents publish events to a subscriber’s channel.
	func (c PublisherClient) PublishEvents(ctx context.Context, req publishingpb.PublishEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishEventsResponse, error) {
	return c.internalClient.PublishEvents(ctx, req, opts...)
	}

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

	// Points back to the CallOptions field of the containing PublisherClient
	CallOptions **PublisherCallOptions

	// The gRPC API client.
	publisherClient publishingpb.PublisherClient

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

	// NewPublisherClient creates a new publisher client based on gRPC.
	// The returned client must be Closed when it is done being used to clean up its underlying connections.
	//
	// Eventarc processes events generated by an event provider and delivers them to
	// a subscriber.
	//
	// An event provider is a software-as-a-service (SaaS) system or
	// product that can generate and deliver events through Eventarc.
	//
	// A third-party event provider is an event provider from outside of Google.
	//
	// A partner is a third-party event provider that is integrated with Eventarc.
	//
	// A subscriber is a GCP customer interested in receiving events.
	//
	// Channel is a first-class Eventarc resource that is created and managed
	// by the subscriber in their GCP project. A Channel represents a subscriber’s
	// intent to receive events from an event provider. A Channel is associated with
	// exactly one event provider.
	//
	// ChannelConnection is a first-class Eventarc resource that
	// is created and managed by the partner in their GCP project. A
	// ChannelConnection represents a connection between a partner and a
	// subscriber’s Channel. A ChannelConnection has a one-to-one mapping with a
	// Channel.
	//
	// Publisher allows an event provider to publish events to Eventarc.
	func NewPublisherClient(ctx context.Context, opts ...option.ClientOption) (*PublisherClient, error) {
	clientOpts := defaultPublisherGRPCClientOptions()
	if newPublisherClientHook != nil {
	hookOpts, err := newPublisherClientHook(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 := PublisherClient{CallOptions: defaultPublisherCallOptions()}

	c := &publisherGRPCClient{
	connPool: connPool,
	publisherClient: publishingpb.NewPublisherClient(connPool),
	CallOptions: &client.CallOptions,
	}
	c.setGoogleClientInfo()

	client.internalClient = c

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

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

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

	// The http client.
	httpClient *http.Client

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

	// Points back to the CallOptions field of the containing PublisherClient
	CallOptions **PublisherCallOptions
	}

	// NewPublisherRESTClient creates a new publisher rest client.
	//
	// Eventarc processes events generated by an event provider and delivers them to
	// a subscriber.
	//
	// An event provider is a software-as-a-service (SaaS) system or
	// product that can generate and deliver events through Eventarc.
	//
	// A third-party event provider is an event provider from outside of Google.
	//
	// A partner is a third-party event provider that is integrated with Eventarc.
	//
	// A subscriber is a GCP customer interested in receiving events.
	//
	// Channel is a first-class Eventarc resource that is created and managed
	// by the subscriber in their GCP project. A Channel represents a subscriber’s
	// intent to receive events from an event provider. A Channel is associated with
	// exactly one event provider.
	//
	// ChannelConnection is a first-class Eventarc resource that
	// is created and managed by the partner in their GCP project. A
	// ChannelConnection represents a connection between a partner and a
	// subscriber’s Channel. A ChannelConnection has a one-to-one mapping with a
	// Channel.
	//
	// Publisher allows an event provider to publish events to Eventarc.
	func NewPublisherRESTClient(ctx context.Context, opts ...option.ClientOption) (*PublisherClient, error) {
	clientOpts := append(defaultPublisherRESTClientOptions(), opts...)
	httpClient, endpoint, err := httptransport.NewClient(ctx, clientOpts...)
	if err != nil {
	return nil, err
	}

	callOpts := defaultPublisherRESTCallOptions()
	c := &publisherRESTClient{
	endpoint: endpoint,
	httpClient: httpClient,
	CallOptions: &callOpts,
	}
	c.setGoogleClientInfo()

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

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

	// setGoogleClientInfo sets the name and version of the application in
	// the `x-goog-api-client` header passed on each request. Intended for
	// use by Google-written clients.
	func (c *publisherRESTClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "rest", "UNKNOWN")
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
	}

	// Close closes the connection to the API service. The user should invoke this when
	// the client is no longer required.
	func (c *publisherRESTClient) 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 publisherRESTClient) Connection() grpc.ClientConn {
	return nil
	}
	func (c publisherGRPCClient) PublishChannelConnectionEvents(ctx context.Context, req publishingpb.PublishChannelConnectionEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "channel_connection", url.QueryEscape(req.GetChannelConnection()))}

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

	func (c publisherGRPCClient) PublishEvents(ctx context.Context, req publishingpb.PublishEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishEventsResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "channel", url.QueryEscape(req.GetChannel()))}

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

	// PublishChannelConnectionEvents publish events to a ChannelConnection in a partner’s project.
	func (c publisherRESTClient) PublishChannelConnectionEvents(ctx context.Context, req publishingpb.PublishChannelConnectionEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishChannelConnectionEventsResponse, 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("/v1/%v:publishEvents", req.GetChannelConnection())

	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", "channel_connection", url.QueryEscape(req.GetChannelConnection()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((c.CallOptions).PublishChannelConnectionEvents[0:len((c.CallOptions).PublishChannelConnectionEvents):len((*c.CallOptions).PublishChannelConnectionEvents)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &publishingpb.PublishChannelConnectionEventsResponse{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	if settings.Path != "" {
	baseUrl.Path = settings.Path
	}
	httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
	if err != nil {
	return err
	}
	httpReq = httpReq.WithContext(ctx)
	httpReq.Header = headers

	httpRsp, err := c.httpClient.Do(httpReq)
	if err != nil {
	return err
	}
	defer httpRsp.Body.Close()

	if err = googleapi.CheckResponse(httpRsp); err != nil {
	return err
	}

	buf, err := io.ReadAll(httpRsp.Body)
	if err != nil {
	return err
	}

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

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

	// PublishEvents publish events to a subscriber’s channel.
	func (c publisherRESTClient) PublishEvents(ctx context.Context, req publishingpb.PublishEventsRequest, opts ...gax.CallOption) (*publishingpb.PublishEventsResponse, 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("/v1/%v:publishEvents", req.GetChannel())

	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", "channel", url.QueryEscape(req.GetChannel()))}

	hds = append(c.xGoogHeaders, hds...)
	hds = append(hds, "Content-Type", "application/json")
	headers := gax.BuildHeaders(ctx, hds...)
	opts = append((c.CallOptions).PublishEvents[0:len((c.CallOptions).PublishEvents):len((*c.CallOptions).PublishEvents)], opts...)
	unm := protojson.UnmarshalOptions{AllowPartial: true, DiscardUnknown: true}
	resp := &publishingpb.PublishEventsResponse{}
	e := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
	if settings.Path != "" {
	baseUrl.Path = settings.Path
	}
	httpReq, err := http.NewRequest("POST", baseUrl.String(), bytes.NewReader(jsonReq))
	if err != nil {
	return err
	}
	httpReq = httpReq.WithContext(ctx)
	httpReq.Header = headers

	httpRsp, err := c.httpClient.Do(httpReq)
	if err != nil {
	return err
	}
	defer httpRsp.Body.Close()

	if err = googleapi.CheckResponse(httpRsp); err != nil {
	return err
	}

	buf, err := io.ReadAll(httpRsp.Body)
	if err != nil {
	return err
	}

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

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