src/cpp/ext/filters/census/client_filter.h

//
//
// Copyright 2018 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//

#ifndef GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_CLIENT_FILTER_H
#define GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_CLIENT_FILTER_H

#include <grpc/support/port_platform.h>

#include "src/core/lib/channel/channel_fwd.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/iomgr/error.h"
#include "src/cpp/common/channel_filter.h"
#include "src/cpp/ext/filters/census/open_census_call_tracer.h"

namespace grpc {
namespace internal {

class CensusClientChannelData : public ChannelData {
 public:
  // A CallData class will be created for every grpc call within a channel. It
  // is used to store data and methods specific to that call.
  // CensusClientCallData is thread-compatible, however typically only 1 thread
  // should be interacting with a call at a time.
  class CensusClientCallData : public CallData {
   public:
    grpc_error_handle Init(grpc_call_element* /* elem */,
                           const grpc_call_element_args* args) override;
    void StartTransportStreamOpBatch(grpc_call_element* elem,
                                     TransportStreamOpBatch* op) override;

   private:
    OpenCensusCallTracer* tracer_ = nullptr;
  };

  grpc_error_handle Init(grpc_channel_element* elem,
                         grpc_channel_element_args* args) override;

 private:
  bool tracing_enabled_ = true;
};

}  // namespace internal
}  // namespace grpc

#endif  // GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_CLIENT_FILTER_H