Istio Itegration Demo

Introduce the journey to integrate Istio.

• Client: switch the client protocol to GRPC.

  client, err := api.NewClient("hello",
  	client.WithHostPorts(serviceName+":8888"),
  	// should use grpc protocol, thrift is not well compatible in istio.
  	client.WithTransportProtocol(transport.GRPC),
  )
  

• Server: specify the protocol kind in the Kubernetes Service definition .

apiVersion: v1
kind: Service
metadata:
  name: hello
spec:
  selector:
    app: hello
  ports:
  - port: 8888
    # istio detect the protocol from the name, this can be configured in two ways: 
    # 1. By the name of the port name: <protocol>[-<suffix>].
    # 2. In Kubernetes 1.18+, by the appProtocol field: appProtocol: <protocol>.
    name: grpc
    protocol: TCP
  type: ClusterIP