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// @file log.h
/* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* 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 <http://www.gnu.org/licenses/>.
*
* 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.
*/
// #pragma once is not used in this header.
// This header attempts to enforce the rule that no logging should be done in
// an inline function defined in a header.
// To enforce this "no logging in header" rule, we use #include guards with a validating #else
// clause.
// Also, this header relies on a preprocessor macro to determine the default component for the
// unconditional logging functions severe(), error(), warning() and log(). Disallowing multiple
// inclusion of log.h will ensure that the default component will be set correctly.
#if defined(MONGO_UTIL_LOG_H_)
#error \
"mongo/util/log.h cannot be included multiple times. " \
"This may occur when log.h is included in a header. " \
"Please check your #include's."
#else // MONGO_UTIL_LOG_H_
#define MONGO_UTIL_LOG_H_
#include "mongo/base/status.h"
#include "mongo/bson/util/builder.h"
#include "mongo/logger/log_component.h"
#include "mongo/logger/logger.h"
#include "mongo/logger/logstream_builder.h"
#include "mongo/logger/tee.h"
#include "mongo/util/concurrency/thread_name.h"
// Provide log component in global scope so that MONGO_LOG will always have a valid component.
// Global log component will be kDefault unless overridden by MONGO_LOG_DEFAULT_COMPONENT.
#if defined(MONGO_LOG_DEFAULT_COMPONENT)
const ::mongo::logger::LogComponent MongoLogDefaultComponent_component =
MONGO_LOG_DEFAULT_COMPONENT;
#else
#error \
"mongo/util/log.h requires MONGO_LOG_DEFAULT_COMPONENT to be defined. " \
"Please see http://www.mongodb.org/about/contributors/reference/server-logging-rules/ "
#endif // MONGO_LOG_DEFAULT_COMPONENT
namespace mongo {
namespace logger {
typedef void (*ExtraLogContextFn)(BufBuilder& builder);
Status registerExtraLogContextFn(ExtraLogContextFn contextFn);
} // namespace logger
namespace {
using logger::LogstreamBuilder;
using logger::LabeledLevel;
using logger::Tee;
/**
* Returns a LogstreamBuilder for logging a message with LogSeverity::Severe().
*/
inline LogstreamBuilder severe() {
return LogstreamBuilder(logger::globalLogDomain(),
getThreadName(),
logger::LogSeverity::Severe(),
::MongoLogDefaultComponent_component);
}
inline LogstreamBuilder severe(logger::LogComponent component) {
return LogstreamBuilder(
logger::globalLogDomain(), getThreadName(), logger::LogSeverity::Severe(), component);
}
/**
* Returns a LogstreamBuilder for logging a message with LogSeverity::Error().
*/
inline LogstreamBuilder error() {
return LogstreamBuilder(logger::globalLogDomain(),
getThreadName(),
logger::LogSeverity::Error(),
::MongoLogDefaultComponent_component);
}
inline LogstreamBuilder error(logger::LogComponent component) {
return LogstreamBuilder(
logger::globalLogDomain(), getThreadName(), logger::LogSeverity::Error(), component);
}
/**
* Returns a LogstreamBuilder for logging a message with LogSeverity::Warning().
*/
inline LogstreamBuilder warning() {
return LogstreamBuilder(logger::globalLogDomain(),
getThreadName(),
logger::LogSeverity::Warning(),
::MongoLogDefaultComponent_component);
}
inline LogstreamBuilder warning(logger::LogComponent component) {
return LogstreamBuilder(
logger::globalLogDomain(), getThreadName(), logger::LogSeverity::Warning(), component);
}
/**
* Returns a LogstreamBuilder for logging a message with LogSeverity::Log().
*/
inline LogstreamBuilder log() {
return LogstreamBuilder(logger::globalLogDomain(),
getThreadName(),
logger::LogSeverity::Log(),
::MongoLogDefaultComponent_component);
}
inline LogstreamBuilder log(logger::LogComponent component) {
return LogstreamBuilder(
logger::globalLogDomain(), getThreadName(), logger::LogSeverity::Log(), component);
}
inline LogstreamBuilder log(logger::LogComponent::Value componentValue) {
return LogstreamBuilder(
logger::globalLogDomain(), getThreadName(), logger::LogSeverity::Log(), componentValue);
}
/**
* Runs the same logic as log()/warning()/error(), without actually outputting a stream.
*/
inline bool shouldLog(logger::LogSeverity severity) {
return logger::globalLogDomain()->shouldLog(::MongoLogDefaultComponent_component, severity);
}
} // namespace
// MONGO_LOG uses log component from MongoLogDefaultComponent from current or global namespace.
#define MONGO_LOG(DLEVEL) \
if (!(::mongo::logger::globalLogDomain()) \
->shouldLog(MongoLogDefaultComponent_component, \
::mongo::LogstreamBuilder::severityCast(DLEVEL))) { \
} else \
::mongo::logger::LogstreamBuilder(::mongo::logger::globalLogDomain(), \
::mongo::getThreadName(), \
::mongo::LogstreamBuilder::severityCast(DLEVEL), \
MongoLogDefaultComponent_component)
#define LOG MONGO_LOG
#define MONGO_LOG_COMPONENT(DLEVEL, COMPONENT1) \
if (!(::mongo::logger::globalLogDomain()) \
->shouldLog((COMPONENT1), ::mongo::LogstreamBuilder::severityCast(DLEVEL))) { \
} else \
::mongo::logger::LogstreamBuilder(::mongo::logger::globalLogDomain(), \
::mongo::getThreadName(), \
::mongo::LogstreamBuilder::severityCast(DLEVEL), \
(COMPONENT1))
#define MONGO_LOG_COMPONENT2(DLEVEL, COMPONENT1, COMPONENT2) \
if (!(::mongo::logger::globalLogDomain()) \
->shouldLog( \
(COMPONENT1), (COMPONENT2), ::mongo::LogstreamBuilder::severityCast(DLEVEL))) { \
} else \
::mongo::logger::LogstreamBuilder(::mongo::logger::globalLogDomain(), \
::mongo::getThreadName(), \
::mongo::LogstreamBuilder::severityCast(DLEVEL), \
(COMPONENT1))
#define MONGO_LOG_COMPONENT3(DLEVEL, COMPONENT1, COMPONENT2, COMPONENT3) \
if (!(::mongo::logger::globalLogDomain()) \
->shouldLog((COMPONENT1), \
(COMPONENT2), \
(COMPONENT3), \
::mongo::LogstreamBuilder::severityCast(DLEVEL))) { \
} else \
::mongo::logger::LogstreamBuilder(::mongo::logger::globalLogDomain(), \
::mongo::getThreadName(), \
::mongo::LogstreamBuilder::severityCast(DLEVEL), \
(COMPONENT1))
/**
* Rotates the log files. Returns true if all logs rotate successfully.
*
* renameFiles - true means we rename files, false means we expect the file to be renamed
* externally
*
* logrotate on *nix systems expects us not to rename the file, it is expected that the program
* simply open the file again with the same name.
* We expect logrotate to rename the existing file before we rotate, and so the next open
* we do should result in a file create.
*/
bool rotateLogs(bool renameFiles);
/** output the error # and error message with prefix.
handy for use as parm in uassert/massert.
*/
std::string errnoWithPrefix(const char* prefix);
extern Tee* const warnings; // Things put here go in serverStatus
extern Tee* const startupWarningsLog; // Things put here get reported in MMS
std::string errnoWithDescription(int errorcode = -1);
/**
* Write the current context (backtrace), along with the optional "msg".
*/
void logContext(const char* msg = NULL);
} // namespace mongo
#endif // MONGO_UTIL_LOG_H_
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