request-response-print-demo.yaml

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: request-response-filter
  namespace: gcp
spec:
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: ANY
        listener:
          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 headers = request_handle:headers()
                local headersMap = {}
                for key, value in pairs(headers) do
                  headersMap[key] = value
                end
                request_handle:streamInfo():dynamicMetadata():set("envoy.lua","request_headers",headersMap)
                local requestBody = ""
                for chunk in request_handle:bodyChunks() do
                  if (chunk:length() > 0) then
                    requestBody = requestBody .. chunk:getBytes(0, chunk:length())
                  end
                end
                request_handle:streamInfo():dynamicMetadata():set("envoy.lua","request_body",requestBody)
              end

              function envoy_on_response(response_handle)
                local headers = response_handle:headers()
                local headersMap = {}
                for key, value in pairs(headers) do
                  headersMap[key] = value
                end
                response_handle:streamInfo():dynamicMetadata():set("envoy.lua","response_headers",headersMap)
                local responseBody = ""
                for chunk in response_handle:bodyChunks() do
                  if (chunk:length() > 0) then
                    responseBody = responseBody .. chunk:getBytes(0, chunk:length())
                  end
                end
                response_handle:streamInfo():dynamicMetadata():set("envoy.lua","response_body",responseBody)
              end