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/* Copyright 2009 10gen Inc.
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <>.
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kControl
#include "mongo/platform/basic.h"
#include "mongo/util/log.h"
#ifdef _WIN32
#include <io.h>
#include <unistd.h>
#include "mongo/logger/console_appender.h"
#include "mongo/logger/message_event_utf8_encoder.h"
#include "mongo/logger/ramlog.h"
#include "mongo/logger/rotatable_file_manager.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/concurrency/thread_name.h"
#include "mongo/util/concurrency/threadlocal.h"
#include "mongo/util/scopeguard.h"
#include "mongo/util/stacktrace.h"
#include "mongo/util/text.h"
#include "mongo/util/time_support.h"
using namespace std;
// TODO: Win32 unicode console writing (in logger/console_appender?).
// TODO: Extra log context appending, and re-enable log_user_*.js
// TODO: Eliminate cout/cerr.
namespace mongo {
namespace {
const char kUnknownMsg[] = "Unknown error";
const int kBuflen = 256; // strerror strings in non-English locales can be large.
static logger::ExtraLogContextFn _appendExtraLogContext;
Status logger::registerExtraLogContextFn(logger::ExtraLogContextFn contextFn) {
if (!contextFn)
return Status(ErrorCodes::BadValue, "Cannot register a NULL log context function.");
if (_appendExtraLogContext) {
return Status(ErrorCodes::AlreadyInitialized,
"Cannot call registerExtraLogContextFn multiple times.");
_appendExtraLogContext = contextFn;
return Status::OK();
bool rotateLogs(bool renameFiles) {
using logger::RotatableFileManager;
RotatableFileManager* manager = logger::globalRotatableFileManager();
log() << "Log rotation initiated";
RotatableFileManager::FileNameStatusPairVector result(
manager->rotateAll(renameFiles, "." + terseCurrentTime(false)));
for (RotatableFileManager::FileNameStatusPairVector::iterator it = result.begin();
it != result.end();
it++) {
warning() << "Rotating log file " << it->first << " failed: " << it->second.toString();
return result.empty();
string errnoWithDescription(int errNumber) {
#if defined(_WIN32)
if (errNumber < 0)
errNumber = GetLastError();
if (errNumber < 0)
errNumber = errno;
char buf[kBuflen];
char* msg{nullptr};
#if defined(__GNUC__) && defined(_GNU_SOURCE)
msg = strerror_r(errNumber, buf, kBuflen);
#elif defined(_WIN32)
LPWSTR errorText = nullptr;
reinterpret_cast<LPWSTR>(&errorText), // output
0, // minimum size for output buffer
if (errorText) {
ON_BLOCK_EXIT([&errorText] { LocalFree(errorText); });
string utf8ErrorText = toUtf8String(errorText);
auto size = utf8ErrorText.find_first_of("\r\n");
if (size == string::npos) { // not found
size = utf8ErrorText.length();
if (size >= kBuflen) {
size = kBuflen - 1;
memcpy(buf, utf8ErrorText.c_str(), size);
buf[size] = '\0';
msg = buf;
} else if (strerror_s(buf, kBuflen, errNumber) != 0) {
msg = buf;
#else /* XSI strerror_r */
if (strerror_r(errNumber, buf, kBuflen) == 0) {
msg = buf;
if (!msg) {
return {kUnknownMsg};
return {msg};
std::pair<int, std::string> errnoAndDescription() {
#if defined(_WIN32)
int errNumber = GetLastError();
int errNumber = errno;
return {errNumber, errnoWithDescription(errNumber)};
void logContext(const char* errmsg) {
if (errmsg) {
log() << errmsg << endl;
// NOTE: We disable long-line truncation for the stack trace, because the JSON representation of
// the stack trace can sometimes exceed the long line limit.
void setPlainConsoleLogger() {
new logger::ConsoleAppender<logger::MessageEventEphemeral>(
new logger::MessageEventUnadornedEncoder)));
Tee* const warnings = RamLog::get("warnings"); // Things put here go in serverStatus
Tee* const startupWarningsLog = RamLog::get("startupWarnings"); // intentionally leaked
} // namespace mongo