go-sdk/examples/service

Dapr Go client example

The examples/service folder contains a Dapr enabled serving app and a client app that uses this SDK to invoke Dapr API for state and events, The serving app is available as HTTP or gRPC. The client app can target either one of these for service to service and binding invocations.

To run this example, start by first launching the service in either HTTP or gRPC:

Prepare

• Dapr installed

HTTP

dapr run --app-id serving \
         --app-protocol http \
         --app-port 8080 \
         --dapr-http-port 3500 \
         --log-level debug \
         --components-path ./config \
         go run ./serving/http/main.go

gRPC

dapr run --app-id serving \
         --app-protocol grpc \
         --app-port 50001 \
         --dapr-grpc-port 3500 \
         --log-level debug \
         --components-path ./config \
         go run ./serving/grpc/main.go

Client

Once one of the above services is running, launch the client:

dapr run --app-id caller \
         --components-path ./config \
         --log-level debug \
         go run ./client/main.go

Custom gRPC client

Launch the DAPR client with custom gRPC client to accept and receive payload size > 4 MB:

dapr run --app-id custom-grpc-client \
		 -d ./config \
		 --dapr-http-max-request-size 41 \
		 --log-level debug \
		 go run ./custom-grpc-client/main.go

API

PubSub

Publish JSON content

curl -d '{ "from": "John", "to": "Lary", "message": "hi" }' \
     -H "Content-type: application/json" \
     "http://localhost:3500/v1.0/publish/messages/topic1"

Publish XML content (read as text)

curl -d '<message><from>John</from><to>Lary</to></message>' \
     -H "Content-type: application/xml" \
     "http://localhost:3500/v1.0/publish/messages/topic1"

Publish BIN content

curl -d '0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40' \
     -H "Content-type: application/octet-stream" \
     "http://localhost:3500/v1.0/publish/messages/topic1"

Service Invocation

Invoke service with JSON payload

curl -d '{ "from": "John", "to": "Lary", "message": "hi" }' \
     -H "Content-type: application/json" \
     "http://localhost:3500/v1.0/invoke/serving/method/echo"

Invoke service with plain text message

curl -d "ping" \
     -H "Content-type: text/plain;charset=UTF-8" \
     "http://localhost:3500/v1.0/invoke/serving/method/echo"

Invoke service with no content

curl -X DELETE \
    "http://localhost:3500/v1.0/invoke/serving/method/echo?k1=v1&k2=v2"

Input Binding

Uses the config/cron.yaml component

Cleanup

dapr stop --app-id serving
(lsof -i:8080 | grep main) | awk '{print $2}' | xargs  kill