wasm 插件配置问题，怎么把 wasm 转成 istio 插件

[novolunt]

写一个 wasm 通过逻辑拦截请求并处理，本地测试通过，不知道如果写 istio 配置

wasm 本地测试通过，怎么写成 istio 可用的配置 其参数官方是这个，但 envoy 配置文件参数那么多，比如 connectTimeout 设置为 15.0s 就没找到相应的配置 https://istio.io/latest/docs/reference/config/proxy_extensions/wasm-plugin/

源 WasmPlugin 插件配置如下，需要怎么更改:

apiVersion: extensions.istio.io/v1alpha1
kind: WasmPlugin
metadata:
  name: header-injection
  namespace: istio-system
spec:
  selector:
    matchLabels:
      istio: ingressgateway
  url: oci://myharbor.com/wasm/add-header:v0.1
  imagePullPolicy: IfNotPresent

源 envoy 配置文件

admin:
  accessLogPath: /dev/null
  address:
    socketAddress:
      address: 0.0.0.0
      portValue: 19000
staticResources:
  clusters:
  - connectTimeout: 15.0s
    dnsLookupFamily: V4_ONLY
    hosts:
    - socketAddress:
        address: jsonplaceholder.typicode.com
        ipv4Compat: true
        portValue: 443
    name: static-cluster
    tlsContext:
      sni: jsonplaceholder.typicode.com
    type: LOGICAL_DNS
  listeners:
  - address:
      socketAddress:
        address: 0.0.0.0
        portValue: 8080
    filterChains:
    - filters:
      - config:
          httpFilters:
          - config:
              config:
                name: add-header
                rootId: add_header
                vmConfig:
                  code:
                    local:
                      filename: /media/filter.wasm
                  runtime: envoy.wasm.runtime.v8
                  vmId: add-header
            name: envoy.filters.http.wasm
          - name: envoy.router
          routeConfig:
            name: test
            virtualHosts:
            - domains:
              - '*'
              name: jsonplaceholder
              routes:
              - match:
                  prefix: /
                route:
                  autoHostRewrite: true
                  cluster: static-cluster
          statPrefix: ingress_http
        name: envoy.http_connection_manager
    name: listener_0

- istio/proxyv2:latest 上测试正常

- istio 上的报错
```
2022-07-21T06:03:18.260303Z warning envoy wasm wasm log: did not find root id
2022-07-21T06:03:18.260753Z warning envoy wasm wasm log: did not find root id
2022-07-21T06:03:30.644131Z critical envoy wasm wasm log istio-system.header-injection: base ctx: can't create context
2022-07-21T06:03:30.644152Z critical envoy wasm wasm log istio-system.header-injection: not implemented
2022-07-21T06:03:30.644217Z error envoy wasm Function: proxy_on_context_create failed: Uncaught RuntimeError: unreachable

```