implement k8s service discovery

[kevwan]

Create service account through the following command.

kubectl apply -f serviceaccount.yaml

serviceaccount.yaml

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: endpoints-reader
rules:
- apiGroups: [""]
  resources: ["endpoints"]
  verbs: ["get", "watch", "list"]

---

apiVersion: v1
kind: ServiceAccount
metadata:
  name: endpoints-reader
  namespace: adhoc

---

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: endpoints-reader
subjects:
- kind: ServiceAccount
  name: endpoints-reader
  namespace: adhoc
roleRef:
  kind: ClusterRole
  name: endpoints-reader
  apiGroup: rbac.authorization.k8s.io

Configure the Transform (for example) RPC as below:

Transform:
    Target: k8s://adhoc/transform:3456

• adhoc: the namespace
• transform: the service name
• 3456: the service port

---

consul, nacos can be supported by implementing their own builders.

Implementing the service discovery by other solutions, please refer to the k8s scheme implementaion.

• the target for consul can be consul://<something represents the service>
• the target for nacos can be nacos://<something represents the service>

Looking forward to someone's contributions.

[kevwan]

Checkout discussions in #478

Thanks to @shiquan1988