envoyfilter.yaml

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: reviews-lua
  namespace: default #应用的名称空间
spec:
  workloadSelector:
    labels:
      app: crm-bms #app label
  configPatches:
  - applyTo: HTTP_FILTER
    match:
      context: SIDECAR_INBOUND
      listener:
        portNumber: 80
        filterChain:
          filter:
            name: "envoy.filters.network.http_connection_manager"
            subFilter:
              name: "envoy.filters.http.router"
    patch:
      operation: INSERT_BEFORE
      value: 
       name: envoy.lua
       typed_config:
          "@type": "type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua"
          inlineCode: |
            function envoy_on_request(request_handle)
              local request_body_buffer = request_handle:body()
              if(request_body_buffer == nil)
              then
                request_handle:streamInfo():dynamicMetadata():set("envoy.lua", "requestBody", "-")
              else
                local request_body_data = request_body_buffer:getBytes(0, request_body_buffer:length())
                request_handle:streamInfo():dynamicMetadata():set("envoy.lua", "requestBody", request_body_data)
              end
            end

            function envoy_on_response(response_handle)
              local response_body_buffer = response_handle:body()
              if(response_body_buffer == nil)
              then
                response_handle:streamInfo():dynamicMetadata():set("envoy.lua", "responseBody", "-")
              else
                local response_body_data = response_body_buffer:getBytes(0, response_body_buffer:length())
                response_handle:streamInfo():dynamicMetadata():set("envoy.lua", "responseBody", response_body_data)
              end
            end

将以上规则应用到集群，然后修改istio配置文件，定制日志格式:    accessLogFormat: "%RESPONSE_CODE% %DYNAMIC_METADATA(envoy.lua)%\n"

用以下命令测试：curl -d '"test":"ok"' crm-bms

查看效果：