Add PassThroughDecoderFilter

Signed-off-by: Auni Ahsan <[email protected]>

test/server/BUILD

@@ -104,6 +104,7 @@ envoy_cc_test(
     name = "filter_config_test",
     srcs = ["filter_config_test.cc"],
     deps = [
+        "//source/extensions/filters/http/common:pass_through_filter_lib",
         "//include/envoy/server:filter_config_interface",
         "//test/mocks/server:server_mocks",
     ],

test/server/filter_config_test.cc

@@ -1,5 +1,6 @@
 #include "envoy/server/filter_config.h"
 
+#include "extensions/filters/http/common/pass_through_filter.h"
 #include "test/mocks/server/factory_context.h"
 
 #include "gmock/gmock.h"
@@ -8,24 +9,6 @@
 namespace Envoy {
 namespace {
 
-class TestHttpFilter : public Http::StreamDecoderFilter {
-public:
-  TestHttpFilter() = default;
-
-  Http::FilterHeadersStatus decodeHeaders(Http::RequestHeaderMap&, bool) override {
-    return Envoy::Http::FilterHeadersStatus::Continue;
-  }
-  Http::FilterDataStatus decodeData(Buffer::Instance&, bool) override {
-    return Envoy::Http::FilterDataStatus::Continue;
-  }
-  Http::FilterTrailersStatus decodeTrailers(Http::RequestTrailerMap&) override {
-    return Envoy::Http::FilterTrailersStatus::Continue;
-  }
-
-  void setDecoderFilterCallbacks(Http::StreamDecoderFilterCallbacks&) override {}
-  void onDestroy() override{};
-};
-
 class TestHttpFilterConfigFactory : public Server::Configuration::NamedHttpFilterConfigFactory {
 public:
   TestHttpFilterConfigFactory() = default;
@@ -34,7 +17,7 @@ class TestHttpFilterConfigFactory : public Server::Configuration::NamedHttpFilte
   createFilterFactoryFromProto(const Protobuf::Message&, const std::string&,
                                Server::Configuration::FactoryContext&) override {
     return [](Http::FilterChainFactoryCallbacks& callbacks) -> void {
-      callbacks.addStreamDecoderFilter(std::make_shared<TestHttpFilter>());
+      callbacks.addStreamDecoderFilter(std::make_shared<Http::PassThroughDecoderFilter>());
     };
   }