Istio grpc transcoder + header to metadata

[No_name01 (No name)]

Em chào mọi người ạ, em tìm cách để sử dụng header to metadata trong istio khi gửi json request. Hiện tại đã có thể transcode json -> protobuf. Đã google 2 ngày rồi mà không tìm thấy cái nào nói về header to metadata. Nhờ mọi người giúp với ạ.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: cict-auth
spec:
  replicas: 1
  selector:
    matchLabels:
      app: cict-auth
  template:
    metadata:
      annotations:
        sidecar.istio.io/userVolume: '[{"name":"descriptor","secret":{"secretName":"systemsecret","items":[{"key":"cict.descriptor","path":"./cict.descriptor"}]}}]'
        sidecar.istio.io/userVolumeMount: '[{"name":"descriptor","mountPath":"/etc/envoy/cict.descriptor","subPath":"cict.descriptor","readOnly":true}]'
      labels:
        app: cict-auth
    spec:
      containers:
      - name: cict-auth
        image: "my/cict-auth:latest"
        resources:
          limits:
            memory: "128Mi"
            cpu: "500m"
        ports:
        - containerPort: 50051
        env:
        - name: CONFIG_JSON
          valueFrom:
            secretKeyRef:
              name: systemsecret
              key: config.json
        - name: MY_POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP

---

apiVersion: v1
kind: Service
metadata:
  name: cict-auth
spec:
  selector:
    app: cict-auth
  ports:
  - port: 50051
    name: grpc-port

---

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: cict-auth-transcoder
spec:
  workloadSelector:
    labels:
      app: cict-auth
  configPatches:
  - applyTo: HTTP_FILTER
    match:
      context: SIDECAR_INBOUND
      listener:
        filterChain:
          filter:
            name: envoy.filters.network.http_connection_manager
            subFilter:
              name: envoy.filters.http.router
        portNumber: 50051
    patch:
      operation: INSERT_FIRST
      value:
        name: envoy.filters.http.header_to_metadata
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.http.header_to_metadata.v3.Config
          request_rules:
            - header: cookie
              on_header_present:
                metadata_namespace: envoy.lb
                key: session_id
                type: STRING
              remove: false
  - applyTo: HTTP_FILTER
    match:
      context: SIDECAR_INBOUND
      listener:
        filterChain:
          filter:
            name: envoy.filters.network.http_connection_manager
            subFilter:
              name: envoy.filters.http.router
        portNumber: 50051
    patch:
      operation: INSERT_FIRST
      value:
        name: envoy.filters.http.grpc_json_transcoder
        typed_config:
          "@type": type.googleapis.com/envoy.extensions.filters.http.grpc_json_transcoder.v3.GrpcJsonTranscoder
          services:
          - cict.service_auth.v1.UserService
          proto_descriptor: "/etc/envoy/cict.descriptor"
          print_options:
            add_whitespace: true
            always_print_primitive_fields: true
            always_print_enums_as_ints: false
            preserve_proto_field_names: false