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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.
*/
#pragma once
#include <boost/optional.hpp>
#include <memory>
#include <sstream>
#include <string>
#include "mongo/base/error_codes.h"
#include "mongo/bson/bsontypes.h"
#include "mongo/logger/log_component.h"
#include "mongo/logger/log_severity.h"
#include "mongo/logger/message_log_domain.h"
#include "mongo/stdx/chrono.h"
#include "mongo/util/exit_code.h"
namespace mongo {
namespace logger {
class Tee;
/**
* Stream-ish object used to build and append log messages.
*/
class LogstreamBuilder {
public:
static LogSeverity severityCast(int ll) {
return LogSeverity::cast(ll);
}
static LogSeverity severityCast(LogSeverity ls) {
return ls;
}
/**
* Construct a LogstreamBuilder that writes to "domain" on destruction.
*
* "contextName" is a short name of the thread or other context.
* "severity" is the logging severity of the message.
*/
LogstreamBuilder(MessageLogDomain* domain, StringData contextName, LogSeverity severity);
/**
* Construct a LogstreamBuilder that writes to "domain" on destruction.
*
* "contextName" is a short name of the thread or other context.
* "severity" is the logging severity of the message.
* "component" is the primary log component of the message.
*
* By default, this class will create one ostream per thread, and it
* will cache that object in a threadlocal and reuse it for subsequent
* logs messages. Set "shouldCache" to false to create a new ostream
* for each instance of this class rather than cacheing.
*/
LogstreamBuilder(MessageLogDomain* domain,
StringData contextName,
LogSeverity severity,
LogComponent component,
bool shouldCache = true);
LogstreamBuilder(LogstreamBuilder&& other) = default;
LogstreamBuilder& operator=(LogstreamBuilder&& other) = default;
/**
* Destroys a LogstreamBuilder(). If anything was written to it via stream() or operator<<,
* constructs a MessageLogDomain::Event and appends it to the associated domain.
*/
~LogstreamBuilder();
/**
* Sets an optional prefix for the message.
*/
LogstreamBuilder& setBaseMessage(const std::string& baseMessage) {
_baseMessage = baseMessage;
return *this;
}
LogstreamBuilder& setIsTruncatable(bool isTruncatable) {
_isTruncatable = isTruncatable;
return *this;
}
std::ostream& stream() {
if (!_os)
makeStream();
return *_os;
}
LogstreamBuilder& operator<<(const char* x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(const std::string& x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(StringData x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(char* x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(char x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(int x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(ExitCode x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(long x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(unsigned long x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(unsigned x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(unsigned short x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(double x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(long long x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(unsigned long long x) {
stream() << x;
return *this;
}
LogstreamBuilder& operator<<(bool x) {
stream() << x;
return *this;
}
template <typename Period>
LogstreamBuilder& operator<<(const Duration<Period>& d) {
stream() << d;
return *this;
}
LogstreamBuilder& operator<<(BSONType t) {
stream() << typeName(t);
return *this;
}
LogstreamBuilder& operator<<(ErrorCodes::Error ec) {
stream() << ErrorCodes::errorString(ec);
return *this;
}
template <typename T>
LogstreamBuilder& operator<<(const T& x) {
stream() << x.toString();
return *this;
}
LogstreamBuilder& operator<<(std::ostream& (*manip)(std::ostream&)) {
stream() << manip;
return *this;
}
LogstreamBuilder& operator<<(std::ios_base& (*manip)(std::ios_base&)) {
stream() << manip;
return *this;
}
template <typename OptionalType>
LogstreamBuilder& operator<<(const boost::optional<OptionalType>& optional) {
if (optional) {
(*this << *optional);
} else {
(*this << "(nothing)");
}
return *this;
}
/**
* In addition to appending the message to _domain, write it to the given tee. May only
* be called once per instance of LogstreamBuilder.
*/
void operator<<(Tee* tee);
private:
void makeStream();
MessageLogDomain* _domain;
std::string _contextName;
LogSeverity _severity;
LogComponent _component;
std::string _baseMessage;
std::unique_ptr<std::ostringstream> _os;
Tee* _tee;
bool _isTruncatable = true;
bool _shouldCache;
};
} // namespace logger
} // namespace mongo
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