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// Copyright (c) 2011-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).
//
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.
//
// Logger implementation that can be shared by all environments
// where enough posix functionality is available.
#pragma once
#include <algorithm>
#include <stdio.h>
#include "port/sys_time.h"
#include <time.h>
#include <fcntl.h>
#ifdef OS_LINUX
#ifndef FALLOC_FL_KEEP_SIZE
#include <linux/falloc.h>
#endif
#endif
#include <atomic>
#include "env/io_posix.h"
#include "monitoring/iostats_context_imp.h"
#include "rocksdb/env.h"
#include "test_util/sync_point.h"
namespace ROCKSDB_NAMESPACE {
class PosixLogger : public Logger {
private:
Status PosixCloseHelper() {
int ret;
ret = fclose(file_);
if (ret) {
return IOError("Unable to close log file", "", ret);
}
return Status::OK();
}
FILE* file_;
uint64_t (*gettid_)(); // Return the thread id for the current thread
std::atomic_size_t log_size_;
int fd_;
const static uint64_t flush_every_seconds_ = 5;
std::atomic_uint_fast64_t last_flush_micros_;
Env* env_;
std::atomic<bool> flush_pending_;
protected:
virtual Status CloseImpl() override { return PosixCloseHelper(); }
public:
PosixLogger(FILE* f, uint64_t (*gettid)(), Env* env,
const InfoLogLevel log_level = InfoLogLevel::ERROR_LEVEL)
: Logger(log_level),
file_(f),
gettid_(gettid),
log_size_(0),
fd_(fileno(f)),
last_flush_micros_(0),
env_(env),
flush_pending_(false) {}
virtual ~PosixLogger() {
if (!closed_) {
closed_ = true;
PosixCloseHelper();
}
}
virtual void Flush() override {
TEST_SYNC_POINT("PosixLogger::Flush:Begin1");
TEST_SYNC_POINT("PosixLogger::Flush:Begin2");
if (flush_pending_) {
flush_pending_ = false;
fflush(file_);
}
last_flush_micros_ = env_->NowMicros();
}
using Logger::Logv;
virtual void Logv(const char* format, va_list ap) override {
IOSTATS_TIMER_GUARD(logger_nanos);
const uint64_t thread_id = (*gettid_)();
// We try twice: the first time with a fixed-size stack allocated buffer,
// and the second time with a much larger dynamically allocated buffer.
char buffer[500];
for (int iter = 0; iter < 2; iter++) {
char* base;
int bufsize;
if (iter == 0) {
bufsize = sizeof(buffer);
base = buffer;
} else {
bufsize = 65536;
base = new char[bufsize];
}
char* p = base;
char* limit = base + bufsize;
struct timeval now_tv;
gettimeofday(&now_tv, nullptr);
const time_t seconds = now_tv.tv_sec;
struct tm t;
localtime_r(&seconds, &t);
p += snprintf(p, limit - p,
"%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));
// Print the message
if (p < limit) {
va_list backup_ap;
va_copy(backup_ap, ap);
p += vsnprintf(p, limit - p, format, backup_ap);
va_end(backup_ap);
}
// Truncate to available space if necessary
if (p >= limit) {
if (iter == 0) {
continue; // Try again with larger buffer
} else {
p = limit - 1;
}
}
// Add newline if necessary
if (p == base || p[-1] != '\n') {
*p++ = '\n';
}
assert(p <= limit);
const size_t write_size = p - base;
#ifdef ROCKSDB_FALLOCATE_PRESENT
const int kDebugLogChunkSize = 128 * 1024;
// If this write would cross a boundary of kDebugLogChunkSize
// space, pre-allocate more space to avoid overly large
// allocations from filesystem allocsize options.
const size_t log_size = log_size_;
const size_t last_allocation_chunk =
((kDebugLogChunkSize - 1 + log_size) / kDebugLogChunkSize);
const size_t desired_allocation_chunk =
((kDebugLogChunkSize - 1 + log_size + write_size) /
kDebugLogChunkSize);
if (last_allocation_chunk != desired_allocation_chunk) {
fallocate(
fd_, FALLOC_FL_KEEP_SIZE, 0,
static_cast<off_t>(desired_allocation_chunk * kDebugLogChunkSize));
}
#endif
size_t sz = fwrite(base, 1, write_size, file_);
flush_pending_ = true;
if (sz > 0) {
log_size_ += write_size;
}
uint64_t now_micros = static_cast<uint64_t>(now_tv.tv_sec) * 1000000 +
now_tv.tv_usec;
if (now_micros - last_flush_micros_ >= flush_every_seconds_ * 1000000) {
Flush();
}
if (base != buffer) {
delete[] base;
}
break;
}
}
size_t GetLogFileSize() const override { return log_size_; }
};
} // namespace ROCKSDB_NAMESPACE
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