http: add server context only factory support to grpc_web filter (#43296)

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Signed-off-by: wbpcode/wangbaiping <wbphub@gmail.com>

Author: wbpcode

source/extensions/filters/http/grpc_web/config.cc

@@ -18,6 +18,14 @@ Http::FilterFactoryCb GrpcWebFilterConfig::createFilterFactoryFromProtoTyped(
   };
 }
 
+Http::FilterFactoryCb GrpcWebFilterConfig::createFilterFactoryFromProtoWithServerContextTyped(
+    const envoy::extensions::filters::http::grpc_web::v3::GrpcWeb&, const std::string&,
+    Server::Configuration::ServerFactoryContext& factory_context) {
+  return [&factory_context](Http::FilterChainFactoryCallbacks& callbacks) {
+    callbacks.addStreamFilter(std::make_shared<GrpcWebFilter>(factory_context.grpcContext()));
+  };
+}
+
 /**
  * Static registration for the gRPC-Web filter. @see RegisterFactory.
  */

source/extensions/filters/http/grpc_web/config.h

@@ -20,6 +20,11 @@ class GrpcWebFilterConfig
       const envoy::extensions::filters::http::grpc_web::v3::GrpcWeb& proto_config,
       const std::string& stats_prefix,
       Server::Configuration::FactoryContext& factory_context) override;
+
+  Http::FilterFactoryCb createFilterFactoryFromProtoWithServerContextTyped(
+      const envoy::extensions::filters::http::grpc_web::v3::GrpcWeb& proto_config,
+      const std::string& stats_prefix,
+      Server::Configuration::ServerFactoryContext& factory_context) override;
 };
 
 } // namespace GrpcWeb

test/extensions/filters/http/grpc_web/config_test.cc

@@ -23,6 +23,17 @@ TEST(GrpcWebFilterConfigTest, GrpcWebFilter) {
   cb(filter_callback);
 }
 
+TEST(GrpcWebFilterConfigTest, GrpcWebFilterWithServerContext) {
+  NiceMock<Server::Configuration::MockServerFactoryContext> context;
+  GrpcWebFilterConfig factory;
+  envoy::extensions::filters::http::grpc_web::v3::GrpcWeb config;
+  Http::FilterFactoryCb cb =
+      factory.createFilterFactoryFromProtoWithServerContext(config, "stats", context);
+  Http::MockFilterChainFactoryCallbacks filter_callback;
+  EXPECT_CALL(filter_callback, addStreamFilter(_));
+  cb(filter_callback);
+}
+
 } // namespace
 } // namespace GrpcWeb
 } // namespace HttpFilters