envoyfilter 使用 lua 案例

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: my-test-filter
spec:
  workloadSelector:
    labels:
      app: httpbin
  configPatches:
  - applyTo: HTTP_FILTER
    match:
      context: SIDECAR_INBOUND
      listener:
        filterChain:
          filter:
            name: "envoy.filters.network.http_connection_manager"
            subFilter:
              name: "envoy.filters.http.router"
    patch:
      operation: INSERT_BEFORE
      value: # lua filter specification
        name: envoy.lua
        typed_config:
          "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua"
          inlineCode: |-
            function envoy_on_request(request_handle)
              request_handle:logInfo("hello world, tanjunchen")
            end
            function envoy_on_response(response_handle)
              response_handle:headers():add("lua", "tanjunchen")
              response_handle:headers():add("istio", "aaaaaaaaaa")
            end

如何在 istio 中使用 lua 拓展 sidecar 数据面？

我们可以使用 lua + envoyfilter 在 http request response 中添加相应的 header 实现该功能。