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rocksdb/util/auto_roll_logger.cc

108 lines
3.3 KiB

// Copyright (c) 2013, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
//
#include "util/auto_roll_logger.h"
#include "util/mutexlock.h"
using namespace std;
namespace rocksdb {
// -- AutoRollLogger
Status AutoRollLogger::ResetLogger() {
status_ = env_->NewLogger(log_fname_, &logger_);
if (!status_.ok()) {
return status_;
}
if (logger_->GetLogFileSize() ==
(size_t)Logger::DO_NOT_SUPPORT_GET_LOG_FILE_SIZE) {
status_ = Status::NotSupported(
"The underlying logger doesn't support GetLogFileSize()");
}
if (status_.ok()) {
cached_now = static_cast<uint64_t>(env_->NowMicros() * 1e-6);
ctime_ = cached_now;
cached_now_access_count = 0;
}
return status_;
}
void AutoRollLogger::RollLogFile() {
std::string old_fname = OldInfoLogFileName(
dbname_, env_->NowMicros(), db_absolute_path_, db_log_dir_);
env_->RenameFile(log_fname_, old_fname);
}
void AutoRollLogger::Logv(const char* format, va_list ap) {
assert(GetStatus().ok());
std::shared_ptr<Logger> logger;
{
MutexLock l(&mutex_);
if ((kLogFileTimeToRoll > 0 && LogExpired()) ||
(kMaxLogFileSize > 0 && logger_->GetLogFileSize() >= kMaxLogFileSize)) {
RollLogFile();
ResetLogger();
}
// pin down the current logger_ instance before releasing the mutex.
logger = logger_;
}
// Another thread could have put a new Logger instance into logger_ by now.
// However, since logger is still hanging on to the previous instance
// (reference count is not zero), we don't have to worry about it being
// deleted while we are accessing it.
// Note that logv itself is not mutex protected to allow maximum concurrency,
// as thread safety should have been handled by the underlying logger.
logger->Logv(format, ap);
}
bool AutoRollLogger::LogExpired() {
if (cached_now_access_count >= call_NowMicros_every_N_records_) {
cached_now = static_cast<uint64_t>(env_->NowMicros() * 1e-6);
cached_now_access_count = 0;
}
++cached_now_access_count;
return cached_now >= ctime_ + kLogFileTimeToRoll;
}
Status CreateLoggerFromOptions(
const std::string& dbname,
const std::string& db_log_dir,
Env* env,
const DBOptions& options,
std::shared_ptr<Logger>* logger) {
std::string db_absolute_path;
env->GetAbsolutePath(dbname, &db_absolute_path);
std::string fname = InfoLogFileName(dbname, db_absolute_path, db_log_dir);
// Currently we only support roll by time-to-roll and log size
if (options.log_file_time_to_roll > 0 || options.max_log_file_size > 0) {
AutoRollLogger* result = new AutoRollLogger(
env, dbname, db_log_dir,
options.max_log_file_size,
options.log_file_time_to_roll);
Status s = result->GetStatus();
if (!s.ok()) {
delete result;
} else {
logger->reset(result);
}
return s;
} else {
// Open a log file in the same directory as the db
env->CreateDir(dbname); // In case it does not exist
env->RenameFile(fname, OldInfoLogFileName(dbname, env->NowMicros(),
db_absolute_path, db_log_dir));
return env->NewLogger(fname, logger);
}
}
} // namespace rocksdb