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by Andrew Johnstone
In: General
17 Sep 2020A quick snippet to add an Istio EnvoyFilter to add x-request-id to all responses
apiVersion: networking.istio.io/v1alpha3 kind: EnvoyFilter metadata: name: gateway-response namespace: istio-system spec: workloadSelector: labels: istio: ingressgateway configPatches: - applyTo: HTTP_FILTER match: context: GATEWAY listener: filterChain: filter: name: "envoy.http_connection_manager" subFilter: name: "envoy.router" patch: operation: INSERT_BEFORE value: name: envoy.lua typed_config: "@type": "type.googleapis.com/envoy.config.filter.http.lua.v2.Lua" inlineCode: | function envoy_on_request(handle) local metadata = handle:streamInfo():dynamicMetadata() local headers = handle:headers() local rid = headers:get("x-request-id") -- for key, value in pairs(handle:headers()) do -- handle:logTrace("key:" .. key .. " <--> value:" .. value) -- end if rid ~= nil then metadata:set("envoy.filters.http.lua", "req.x-request-id", rid) end end function envoy_on_response(handle) local metadata = handle:streamInfo():dynamicMetadata():get("envoy.filters.http.lua") local rid = metadata["req.x-request-id"] if rid ~= nil then handle:headers():add("x-request-id", rid) end end
I have been a developer for roughly 10 years and have worked with an extensive range of technologies. Whilst working for relatively small companies, I have worked with all aspects of the development life cycle, which has given me a broad and in-depth experience.