rocksdb/util/stderr_logger.h

//  Copyright (c) 2016-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

#pragma once

#include <stdarg.h>
#include <stdio.h>

#include "port/sys_time.h"
#include "rocksdb/env.h"

namespace ROCKSDB_NAMESPACE {

// Prints logs to stderr for faster debugging
class StderrLogger : public Logger {
 public:
  explicit StderrLogger(const InfoLogLevel log_level = InfoLogLevel::INFO_LEVEL)
      : Logger(log_level) {}

  // Brings overloaded Logv()s into scope so they're not hidden when we override
  // a subset of them.
  using Logger::Logv;

  virtual void Logv(const char* format, va_list ap) override {
    const uint64_t thread_id = Env::Default()->GetThreadID();

    port::TimeVal now_tv;
    port::GetTimeOfDay(&now_tv, nullptr);
    const time_t seconds = now_tv.tv_sec;
    struct tm t;
    port::LocalTimeR(&seconds, &t);
    fprintf(stderr, "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
            t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min,
            t.tm_sec, static_cast<int>(now_tv.tv_usec),
            static_cast<long long unsigned int>(thread_id));

    vfprintf(stderr, format, ap);
    fprintf(stderr, "\n");
  }
};

}  // namespace ROCKSDB_NAMESPACE