Nevar pievienot vairāk kā 25 tēmas
Tēmai ir jāsākas ar burtu vai ciparu, tā var saturēt domu zīmes ('-') un var būt līdz 35 simboliem gara.
98 rindas
2.7 KiB
98 rindas
2.7 KiB
// 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.
|
|
|
|
#ifndef STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
|
|
#define STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
|
|
|
|
#include <algorithm>
|
|
#include <stdio.h>
|
|
#include <sys/time.h>
|
|
#include <time.h>
|
|
#include "leveldb/env.h"
|
|
|
|
namespace leveldb {
|
|
|
|
class PosixLogger : public Logger {
|
|
private:
|
|
FILE* file_;
|
|
uint64_t (*gettid_)(); // Return the thread id for the current thread
|
|
public:
|
|
PosixLogger(FILE* f, uint64_t (*gettid)()) : file_(f), gettid_(gettid) { }
|
|
virtual ~PosixLogger() {
|
|
fclose(file_);
|
|
}
|
|
virtual void Logv(const char* format, va_list ap) {
|
|
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 = 30000;
|
|
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);
|
|
fwrite(base, 1, p - base, file_);
|
|
fflush(file_);
|
|
if (base != buffer) {
|
|
delete[] base;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
};
|
|
|
|
} // namespace leveldb
|
|
|
|
#endif // STORAGE_LEVELDB_UTIL_POSIX_LOGGER_H_
|