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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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.
*/
#include "mongo/platform/basic.h"
#include "mongo/logger/logstream_builder.h"
#include <memory>
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/logger/message_event_utf8_encoder.h"
#include "mongo/logger/tee.h"
#include "mongo/stdx/memory.h"
#include "mongo/util/assert_util.h" // TODO: remove apple dep for this in threadlocal.h
#include "mongo/util/time_support.h"
namespace mongo {
namespace {
/// This flag indicates whether the system providing a per-thread cache of ostringstreams
/// for use by LogstreamBuilder instances is initialized and ready for use. Until this
/// flag is true, LogstreamBuilder instances must not use the cache.
bool isThreadOstreamCacheInitialized = false;
MONGO_INITIALIZER(LogstreamBuilder)(InitializerContext*) {
isThreadOstreamCacheInitialized = true;
return Status::OK();
}
thread_local std::unique_ptr<std::ostringstream> threadOstreamCache;
// During unittests, where we don't use quickExit(), static finalization may destroy the
// cache before its last use, so mark it as not initialized in that case.
// This must be after the definition of threadOstreamCache so that it is destroyed first.
struct ThreadOstreamCacheFinalizer {
~ThreadOstreamCacheFinalizer() {
isThreadOstreamCacheInitialized = false;
}
} threadOstreamCacheFinalizer;
} // namespace
namespace logger {
LogstreamBuilder::LogstreamBuilder(MessageLogDomain* domain,
StringData contextName,
LogSeverity severity)
: LogstreamBuilder(domain, contextName, std::move(severity), LogComponent::kDefault) {}
LogstreamBuilder::LogstreamBuilder(MessageLogDomain* domain,
StringData contextName,
LogSeverity severity,
LogComponent component,
bool shouldCache)
: _domain(domain),
_contextName(contextName.toString()),
_severity(std::move(severity)),
_component(std::move(component)),
_tee(nullptr),
_shouldCache(shouldCache) {}
LogstreamBuilder::~LogstreamBuilder() {
if (_os) {
if (!_baseMessage.empty())
_baseMessage.push_back(' ');
_baseMessage += _os->str();
MessageEventEphemeral message(
Date_t::now(), _severity, _component, _contextName, _baseMessage);
message.setIsTruncatable(_isTruncatable);
_domain->append(message).transitional_ignore();
if (_tee) {
_os->str("");
logger::MessageEventDetailsEncoder teeEncoder;
teeEncoder.encode(message, *_os);
_tee->write(_os->str());
}
_os->str("");
if (_shouldCache && isThreadOstreamCacheInitialized && !threadOstreamCache) {
threadOstreamCache = std::move(_os);
}
}
}
void LogstreamBuilder::operator<<(Tee* tee) {
makeStream(); // Adding a Tee counts for purposes of deciding to make a log message.
// TODO: dassert(!_tee);
_tee = tee;
}
void LogstreamBuilder::makeStream() {
if (!_os) {
if (_shouldCache && isThreadOstreamCacheInitialized && threadOstreamCache) {
_os = std::move(threadOstreamCache);
} else {
_os = stdx::make_unique<std::ostringstream>();
}
}
}
} // namespace logger
} // namespace mongo
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