header-filter.yaml

apiVersion: networking.istio.io/v1alpha3
kind: EnvoyFilter
metadata:
  name: header-filter
  namespace: gcp
spec:
  workloadSelector:
    labels:
      version: beta
  configPatches:
    - applyTo: HTTP_FILTER
      match:
        context: SIDECAR_OUTBOUND
        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)
                request_handle:logWarn("---------------- OUTBOUND request start -------------------")
                local headers = request_handle:headers()
                for key,value in pairs(headers) do
                  request_handle:logWarn("key=" .. key .. " value=" .. value)
                end

                request_handle:logWarn("---------------- cluster request start -------------------")
                local headers, body = request_handle:httpCall(
                "test_cluster",
                {
                  [":method"] = "GET",
                  [":path"] = "/ping",
                  [":authority"] = "test_cluster"
                },
                "hello world",
                5000)
                request_handle:logWarn("ping: " .. body)
                request_handle:logWarn("---------------- cluster request end -------------------")

                request_handle:logWarn("------ OUTBOUND metadata -----")
                local metad = request_handle:metadata()
                for keym,valuem in pairs(metad) do
                    request_handle:logWarn("keym=" .. keym .. " valuem=" .. valuem)
                end
                request_handle:logWarn("------------ OUTBOUND request finish --------------------")
                request_handle:logWarn("\n")
              end

    - 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:
          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:logWarn("---------------- INBOUND request start -------------------")
                local headers = request_handle:headers()
                for key,value in pairs(headers) do
                  request_handle:logWarn("key=" .. key .. " value=" .. value)
                end

                request_handle:logWarn("------ INBOUND metadata -----")
                local metad = request_handle:metadata()
                for keym,valuem in pairs(metad) do
                    request_handle:logWarn("keym=" .. keym .. " valuem=" .. valuem)
                end
                request_handle:logWarn("------------ INBOUND request finish --------------------")
                request_handle:logWarn("\n")
              end

    - applyTo: CLUSTER
      match:
        context: SIDECAR_OUTBOUND
      patch:
        operation: ADD
        value:
          name: "test_cluster"
          type: STRICT_DNS
          connect_timeout: 2s
          lb_policy: ROUND_ROBIN
          load_assignment:
            cluster_name: test_cluster
            endpoints:
              - lb_endpoints:
                  - endpoint:
                      address:
                        socket_address:
                          address: "oms-gateway.regoo"
                          port_value: 8080