fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph
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167 lines
4.7 KiB
167 lines
4.7 KiB
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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//
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// Logger implementation that uses custom Env object for logging.
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#pragma once
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#include <time.h>
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#include <atomic>
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#include <memory>
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#include "port/sys_time.h"
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#include "file/writable_file_writer.h"
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#include "monitoring/iostats_context_imp.h"
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#include "rocksdb/env.h"
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#include "rocksdb/slice.h"
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#include "test_util/sync_point.h"
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#include "util/mutexlock.h"
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namespace ROCKSDB_NAMESPACE {
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class EnvLogger : public Logger {
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public:
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EnvLogger(std::unique_ptr<FSWritableFile>&& writable_file,
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const std::string& fname, const EnvOptions& options, Env* env,
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InfoLogLevel log_level = InfoLogLevel::ERROR_LEVEL)
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: Logger(log_level),
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env_(env),
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clock_(env_->GetSystemClock().get()),
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file_(std::move(writable_file), fname, options, clock_),
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last_flush_micros_(0),
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flush_pending_(false) {}
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~EnvLogger() {
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if (!closed_) {
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closed_ = true;
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CloseHelper().PermitUncheckedError();
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}
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}
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private:
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void FlushLocked() {
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mutex_.AssertHeld();
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if (flush_pending_) {
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flush_pending_ = false;
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file_.Flush().PermitUncheckedError();
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}
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last_flush_micros_ = clock_->NowMicros();
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}
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void Flush() override {
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TEST_SYNC_POINT("EnvLogger::Flush:Begin1");
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TEST_SYNC_POINT("EnvLogger::Flush:Begin2");
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MutexLock l(&mutex_);
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FlushLocked();
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}
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Status CloseImpl() override { return CloseHelper(); }
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Status CloseHelper() {
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mutex_.Lock();
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const auto close_status = file_.Close();
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mutex_.Unlock();
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if (close_status.ok()) {
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return close_status;
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}
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return Status::IOError("Close of log file failed with error:" +
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(close_status.getState()
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? std::string(close_status.getState())
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: std::string()));
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}
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using Logger::Logv;
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void Logv(const char* format, va_list ap) override {
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IOSTATS_TIMER_GUARD(logger_nanos);
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const uint64_t thread_id = env_->GetThreadID();
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// We try twice: the first time with a fixed-size stack allocated buffer,
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// and the second time with a much larger dynamically allocated buffer.
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char buffer[500];
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for (int iter = 0; iter < 2; iter++) {
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char* base;
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int bufsize;
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if (iter == 0) {
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bufsize = sizeof(buffer);
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base = buffer;
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} else {
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bufsize = 65536;
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base = new char[bufsize];
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}
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char* p = base;
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char* limit = base + bufsize;
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port::TimeVal now_tv;
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port::GetTimeOfDay(&now_tv, nullptr);
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const time_t seconds = now_tv.tv_sec;
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struct tm t;
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port::LocalTimeR(&seconds, &t);
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p += snprintf(p, limit - p, "%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
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t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour,
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t.tm_min, t.tm_sec, static_cast<int>(now_tv.tv_usec),
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static_cast<long long unsigned int>(thread_id));
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// Print the message
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if (p < limit) {
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va_list backup_ap;
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va_copy(backup_ap, ap);
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p += vsnprintf(p, limit - p, format, backup_ap);
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va_end(backup_ap);
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}
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// Truncate to available space if necessary
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if (p >= limit) {
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if (iter == 0) {
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continue; // Try again with larger buffer
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} else {
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p = limit - 1;
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}
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}
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// Add newline if necessary
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if (p == base || p[-1] != '\n') {
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*p++ = '\n';
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}
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assert(p <= limit);
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mutex_.Lock();
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// We will ignore any error returned by Append().
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file_.Append(Slice(base, p - base)).PermitUncheckedError();
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flush_pending_ = true;
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const uint64_t now_micros = clock_->NowMicros();
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if (now_micros - last_flush_micros_ >= flush_every_seconds_ * 1000000) {
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FlushLocked();
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}
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mutex_.Unlock();
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if (base != buffer) {
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delete[] base;
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}
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break;
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}
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}
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size_t GetLogFileSize() const override {
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MutexLock l(&mutex_);
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return file_.GetFileSize();
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}
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private:
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Env* env_;
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SystemClock* clock_;
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WritableFileWriter file_;
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mutable port::Mutex mutex_; // Mutex to protect the shared variables below.
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const static uint64_t flush_every_seconds_ = 5;
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std::atomic_uint_fast64_t last_flush_micros_;
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std::atomic<bool> flush_pending_;
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};
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} // namespace ROCKSDB_NAMESPACE
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