1 // 2 // 3 // Copyright 2021 gRPC authors. 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 // 17 // 18 19 #ifndef GRPC_CORE_EXT_XDS_XDS_CHANNEL_STACK_MODIFIER_H 20 #define GRPC_CORE_EXT_XDS_XDS_CHANNEL_STACK_MODIFIER_H 21 22 #include <grpc/support/port_platform.h> 23 24 #include <vector> 25 26 #include "src/core/lib/channel/channel_stack.h" 27 #include "src/core/lib/channel/channel_stack_builder.h" 28 #include "src/core/lib/gprpp/ref_counted.h" 29 30 namespace grpc_core { 31 32 // XdsChannelStackModifier allows for inserting xDS HTTP filters into the 33 // channel stack. It is registered to mutate the `grpc_channel_stack_builder` 34 // object via ChannelInit::Builder::RegisterStage. 35 class XdsChannelStackModifier : public RefCounted<XdsChannelStackModifier> { 36 public: XdsChannelStackModifier(std::vector<const grpc_channel_filter * > filters)37 explicit XdsChannelStackModifier( 38 std::vector<const grpc_channel_filter*> filters) 39 : filters_(std::move(filters)) {} 40 // Returns true on success, false otherwise. 41 bool ModifyChannelStack(grpc_channel_stack_builder* builder); 42 grpc_arg MakeChannelArg() const; 43 static RefCountedPtr<XdsChannelStackModifier> GetFromChannelArgs( 44 const grpc_channel_args& args); 45 46 private: 47 std::vector<const grpc_channel_filter*> filters_; 48 }; 49 50 } // namespace grpc_core 51 52 #endif /* GRPC_CORE_EXT_XDS_XDS_CHANNEL_STACK_MODIFIER_H */ 53