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98 行
2.7 KiB
98 行
2.7 KiB
// 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 can be shared by all environments
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// where enough posix functionality is available.
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#ifndef STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
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#define STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
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#include <algorithm>
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#include <stdio.h>
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#include <sys/time.h>
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#include <time.h>
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#include "leveldb/env.h"
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namespace leveldb {
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class PosixLogger : public Logger {
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private:
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FILE* file_;
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uint64_t (*gettid_)(); // Return the thread id for the current thread
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public:
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PosixLogger(FILE* f, uint64_t (*gettid)()) : file_(f), gettid_(gettid) { }
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virtual ~PosixLogger() {
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fclose(file_);
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}
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virtual void Logv(const char* format, va_list ap) {
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const uint64_t thread_id = (*gettid_)();
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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 = 30000;
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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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struct timeval now_tv;
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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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localtime_r(&seconds, &t);
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p += snprintf(p, limit - p,
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"%04d/%02d/%02d-%02d:%02d:%02d.%06d %llx ",
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t.tm_year + 1900,
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t.tm_mon + 1,
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t.tm_mday,
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t.tm_hour,
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t.tm_min,
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t.tm_sec,
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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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fwrite(base, 1, p - base, file_);
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fflush(file_);
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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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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
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