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+# Dapr and gRPC
+
+Dapr implements both an http API and a gRPC interface.
+gRPC is useful for low-latency, high performance scenarios and has deep language integration using the proto clients.
+
+You can find a list of autogenerated client [here](https://github.com/dapr/docs#sdks).
+
+The Dapr runtime implements a [proto service](https://github.com/dapr/dapr/blob/master/pkg/proto/dapr/dapr.proto) that apps can communicate with via gRPC.
+In addition to talking to Dapr via gRPC, Dapr can communicate with an application via gRPC.
+
+To do that, the app simply needs to host a gRPC server and implement the [Dapr client service](https://github.com/dapr/dapr/blob/master/pkg/proto/daprclient/daprclient.proto).
+
+## Configuring Dapr to communicate with app via gRPC
+
+### Kubernetes
+
+On Kubernetes, set the following annotations in your deployment YAML:
+
+<pre>
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myapp
+  labels:
+    app: myapp
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: myapp
+  template:
+    metadata:
+      labels:
+        app: myapp
+      annotations:
+        dapr.io/enabled: "true"
+        dapr.io/id: "myapp"
+        <b>dapr.io/protocol: "grpc"
+        dapr.io/port: "5005"</b>
+...
+</pre>
+
+This tells Dapr to communicate with your app via gRPC over port `5005`.
+
+### Standalone
+
+When running in standalone mode, use the `--protocol` flag to tell Dapr to use gRPC to talk to the app:
+
+```
+dapr run --protocol grpc --app-port 5005 node app.js
+```
+
+## Invoking Dapr - Go example
+
+The following steps will show you how to create a Dapr client and call the Save State operation on it:
+
+1. Import the package
+
+```go
+package main
+
+import (
+    pb "github.com/dapr/go-sdk/dapr"
+)
+```
+
+2. Create the client
+
+```go
+    // Get the Dapr port and create a connection
+	daprPort := os.Getenv("DAPR_GRPC_PORT")
+	daprAddress := fmt.Sprintf("localhost:%s", daprPort)
+	conn, err := grpc.Dial(daprAddress, grpc.WithInsecure())
+	if err != nil {
+		fmt.Println(err)
+	}
+	defer conn.Close()
+
+	// Create the client
+	client := pb.NewDaprClient(conn)
+```
+
+3. Invoke the Save State method
+
+```go
+_, err = client.SaveState(context.Background(), &pb.SaveStateEnvelope{
+		Requests: []*pb.StateRequest{
+			&pb.StateRequest{
+				Key: "myKey",
+				Value: &any.Any{
+					Value: []byte("My State"),
+				},
+			},
+		},
+	})
+```
+
+Hooray!
+
+Now you can explore all the different methods on the Dapr client.
+
+## Creating a gRPC app with Dapr
+
+The following steps will show you how to create an app that exposes a server for Dapr to communicate with.
+
+1. Import the package
+
+```go
+package main
+
+import (
+	pb "github.com/dapr/go-sdk/daprclient"
+)
+```
+
+2. Implement the interface
+
+```go
+// server is our user app
+type server struct {
+}
+
+// Sample method to invoke
+func (s *server) MyMethod() string {
+	return "Hi there!"
+}
+
+// This method gets invoked when a remote service has called the app through Dapr
+// The payload carries a Method to identify the method, a set of metadata properties and an optional payload
+func (s *server) OnInvoke(ctx context.Context, in *pb.InvokeEnvelope) (*any.Any, error) {
+	var response string
+	switch in.Method {
+	case "MyMethod":
+		response = s.MyMethod()
+	}
+	return &any.Any{
+		Value: []byte(response),
+	}, nil
+}
+
+// Dapr will call this method to get the list of topics the app wants to subscribe to. In this example, we are telling Dapr
+// To subscribe to a topic named TopicA
+func (s *server) GetTopicSubscriptions(ctx context.Context, in *empty.Empty) (*pb.GetTopicSubscriptionsEnvelope, error) {
+	return &pb.GetTopicSubscriptionsEnvelope{
+		Topics: []string{"TopicA"},
+	}, nil
+}
+
+// Dapper will call this method to get the list of bindings the app will get invoked by. In this example, we are telling Dapr
+// To invoke our app with a binding named storage
+func (s *server) GetBindingsSubscriptions(ctx context.Context, in *empty.Empty) (*pb.GetBindingsSubscriptionsEnvelope, error) {
+	return &pb.GetBindingsSubscriptionsEnvelope{
+		Bindings: []string{"storage"},
+	}, nil
+}
+
+// This method gets invoked every time a new event is fired from a registerd binding. The message carries the binding name, a payload and optional metadata
+func (s *server) OnBindingEvent(ctx context.Context, in *pb.BindingEventEnvelope) (*pb.BindingResponseEnvelope, error) {
+	fmt.Println("Invoked from binding")
+	return &pb.BindingResponseEnvelope{}, nil
+}
+
+// This method is fired whenever a message has been published to a topic that has been subscribed. Dapr sends published messages in a CloudEvents 0.3 envelope.
+func (s *server) OnTopicEvent(ctx context.Context, in *pb.CloudEventEnvelope) (*empty.Empty, error) {
+	fmt.Println("Topic message arrived")
+	return &empty.Empty{}, nil
+}
+
+```
+
+3. Create the server
+
+```go
+func main() {
+	// create listiner
+	lis, err := net.Listen("tcp", ":4000")
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	// create grpc server
+	s := grpc.NewServer()
+	pb.RegisterDaprClientServer(s, &server{})
+
+	fmt.Println("Client starting...")
+
+	// and start...
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}
+```
+
+This creates a gRPC server for your app on port 4000.
+
+4. Run your app
+
+To run locally, use the Dapr CLI:
+
+```
+dapr run --app-id goapp --app-port 4000 --protocol grpc go run main.go
+```
+
+On Kubernetes, set the required `dapr.io/protocol: "grpc"` and `dapr.io/port: "4000` annotations in your pod spec template as mentioned above.
+
+## Other languages
+
+You can use Dapr with any language supported by Protobuf, and not just with the currently available generated SDKs.
+Using the [protoc](https://developers.google.com/protocol-buffers/docs/downloads) tool you can generate the Dapr clients for other languages like Ruby, C++, Rust and others.