Bhojpur API- gRPC Service SDK

Start by importing service/grpc package:

appsvr "github.com/bhojpur/api/pkg/service/grpc"

Creating and Starting Service

To create a gRPC application service, first, create an application callback instance with a specific address:

s, err := appsvr.NewService(":50001")
if err != nil {
    log.Fatalf("failed to start the server: %v", err)
}

or, with address and an existing net.Listener in case you want to combine existing server listener:

list, err := net.Listen("tcp", "localhost:0")
if err != nil {
	log.Fatalf("gRPC listener creation failed: %s", err)
}
s := appsvr.NewServiceWithListener(list)

Once you create a service instance, you can "attach" to that service any number of event, binding, and service invocation logic handlers as shown below. Once the logic is defined, you are ready to start the service:

if err := s.Start(); err != nil {
    log.Fatalf("server error: %v", err)
}

Event Handling

To handle events from specific topic you need to add at least one topic event handler before starting the service:

sub := &common.Subscription{
		PubsubName: "messages",
		Topic:      "topic1",
	}
if err := s.AddTopicEventHandler(sub, eventHandler); err != nil {
    log.Fatalf("error adding topic subscription: %v", err)
}

The handler method itself can be any method with the expected signature:

func eventHandler(ctx context.Context, e *common.TopicEvent) (retry bool, err error) {
	log.Printf("event - PubsubName:%s, Topic:%s, ID:%s, Data: %v", e.PubsubName, e.Topic, e.ID, e.Data)
	// do something with the event
	return true, nil
}

Service Invocation Handler

To handle service invocations you will need to add at least one service invocation handler before starting the service:

if err := s.AddServiceInvocationHandler("echo", echoHandler); err != nil {
    log.Fatalf("error adding invocation handler: %v", err)
}

The handler method itself can be any method with the expected signature:

func echoHandler(ctx context.Context, in *common.InvocationEvent) (out *common.Content, err error) {
	log.Printf("echo - ContentType:%s, Verb:%s, QueryString:%s, %+v", in.ContentType, in.Verb, in.QueryString, string(in.Data))
	// do something with the invocation here 
	out = &common.Content{
		Data:        in.Data,
		ContentType: in.ContentType,
		DataTypeURL: in.DataTypeURL,
	}
	return
}

Binding Invocation Handler

To handle binding invocations, you will need to add at least one binding invocation handler before starting the service:

if err := s.AddBindingInvocationHandler("run", runHandler); err != nil {
    log.Fatalf("error adding binding handler: %v", err)
}

The handler method itself can be any method with the expected signature:

func runHandler(ctx context.Context, in *common.BindingEvent) (out []byte, err error) {
	log.Printf("binding - Data:%v, Meta:%v", in.Data, in.Metadata)
	// do something with the invocation here 
	return nil, nil
}