http binding

Readme.md

@@ -25,5 +25,3 @@ dapr run --app-id serving --protocol grpc --app-port 4000 go run main.go
 cd example/client
 dapr run --app-id caller go run main.go
 ```
-
-> If you don't setup a Dapr binding, expect the error message `rpc error: code = Unknown desc = ERR_INVOKE_OUTPUT_BINDING: couldn't find output binding storage`

client/client.go

@@ -2,7 +2,7 @@ package client
 
 import (
 	"context"
-	"fmt"
+	"log"
 	"net"
 	"os"
 
@@ -16,6 +16,10 @@ const (
 	daprPortEnvVarName = "DAPR_GRPC_PORT"
 )
 
+var (
+	logger = log.New(os.Stdout, "", 0)
+)
+
 // NewClientWithAddress instantiates dapr client locally using port from DAPR_GRPC_PORT env var
 // When DAPR_GRPC_PORT client defaults to 4000
 func NewClient() (client *Client, err error) {
@@ -34,7 +38,7 @@ func NewClientWithPort(port string) (client *Client, err error) {
 
 // NewClientWithAddress instantiates dapr client configured for the specific address
 func NewClientWithAddress(address string) (client *Client, err error) {
-	fmt.Printf("dapr client initializing for: %s", address)
+	logger.Printf("dapr client initializing for: %s", address)
 	conn, err := grpc.Dial(address, grpc.WithInsecure())
 	if err != nil {
 		return nil, errors.Wrapf(err, "error creating connection to '%s': %v", address, err)

example/client/components/binding.yaml

@@ -0,0 +1,12 @@
+apiVersion: dapr.io/v1alpha1
+kind: Component
+metadata:
+  name: example-http-binding
+spec:
+  type: bindings.http
+  metadata:
+  - name: url
+    value: https://http2.pro/api/v1
+  - name: method
+    value: GET
+

example/client/main.go

@@ -19,13 +19,6 @@ func main() {
 	}
 	defer client.Close(ctx)
 
-	// invoke a method called MyMethod on another dapr enabled service with id client
-	resp, err := client.InvokeService(ctx, "serving", "MyMethod", data)
-	if err != nil {
-		panic(err)
-	}
-	fmt.Println(string(resp))
-
 	// publish a message to the topic messagebus
 	err = client.PublishEvent(ctx, "messagebus", data)
 	if err != nil {
@@ -54,9 +47,16 @@ func main() {
 	}
 	fmt.Println("data deleted")
 
-	// invoke output binding named 'example-binding'.
-	// make sure you set up a dapr binding, otherwise this will fail
-	err = client.InvokeBinding(ctx, "example-binding", data)
+	// invoke a method called MyMethod on another dapr enabled service with id client
+	resp, err := client.InvokeService(ctx, "serving", "MyMethod", data)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(string(resp))
+
+	// invoke output binding named 'example-http-binding'
+	// uses https://http2.pro/doc/api to check for HTTP/2
+	err = client.InvokeBinding(ctx, "example-http-binding", data)
 	if err != nil {
 		panic(err)
 	}