sandboxed_api/sandbox2/logsink.h

// Copyright 2019 Google LLC
//
// 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
//
//     https://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 SANDBOXED_API_SANDBOX2_LOGSINK_H_
#define SANDBOXED_API_SANDBOX2_LOGSINK_H_

#include "absl/log/log_entry.h"
#include "absl/log/log_sink.h"
#include "absl/synchronization/mutex.h"
#include "sandboxed_api/sandbox2/comms.h"

namespace sandbox2 {

// The LogSink will register itself with the facilities and forward all log
// messages to the executor on a given file descriptor.
class LogSink : public absl::LogSink {
 public:
  static constexpr char kLogFDName[] = "sb2_logsink";

  explicit LogSink(int fd);
  ~LogSink() override;

  LogSink(const LogSink&) = delete;
  LogSink& operator=(const LogSink&) = delete;

  void Send(const absl::LogEntry& e) override;

 private:
  Comms comms_;

  // Needed to make the LogSink thread safe.
  absl::Mutex lock_;
};

}  // namespace sandbox2

#endif  // SANDBOXED_API_SANDBOX2_LOGSINK_H_