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// lasterror.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
#include <boost/noncopyable.hpp>
#include <boost/thread/tss.hpp>
#include <string>
#include "mongo/db/jsobj.h"
#include "mongo/bson/oid.h"
namespace mongo {
class BSONObjBuilder;
class Message;
static const char kUpsertedFieldName[] = "upserted";
static const char kGLEStatsFieldName[] = "$gleStats";
static const char kGLEStatsLastOpTimeFieldName[] = "lastOpTime";
static const char kGLEStatsLastOpTimeTermFieldName[] = "lastOpTimeTerm";
static const char kGLEStatsElectionIdFieldName[] = "electionId";
struct LastError {
int code;
std::string msg;
enum UpdatedExistingType { NotUpdate, True, False } updatedExisting;
// _id field value from inserted doc, returned as kUpsertedFieldName (above)
BSONObj upsertedId;
OID writebackId; // this shouldn't get reset so that old GLE are handled
int writebackSince;
long long nObjects;
int nPrev;
bool valid;
bool disabled;
void writeback(const OID& oid) {
reset( true );
writebackId = oid;
writebackSince = 0;
}
void raiseError(int _code , const char *_msg) {
reset( true );
code = _code;
msg = _msg;
}
void recordUpdate( bool _updateObjects , long long _nObjects , BSONObj _upsertedId ) {
reset( true );
nObjects = _nObjects;
updatedExisting = _updateObjects ? True : False;
if ( _upsertedId.valid() && _upsertedId.hasField(kUpsertedFieldName) )
upsertedId = _upsertedId;
}
void recordDelete( long long nDeleted ) {
reset( true );
nObjects = nDeleted;
}
LastError() {
reset();
writebackSince = 0;
}
void reset( bool _valid = false ) {
code = 0;
msg.clear();
updatedExisting = NotUpdate;
nObjects = 0;
nPrev = 1;
valid = _valid;
disabled = false;
upsertedId = BSONObj();
}
/**
* @return if there is an err
*/
bool appendSelf( BSONObjBuilder &b , bool blankErr = true );
/**
* appends fields which are not "error" related
* this whole mechanism needs to be re-written
* but needs a lot of real thought
*/
void appendSelfStatus( BSONObjBuilder &b );
struct Disabled : boost::noncopyable {
Disabled( LastError * le ) {
_le = le;
if ( _le ) {
_prev = _le->disabled;
_le->disabled = true;
}
else {
_prev = false;
}
}
~Disabled() {
if ( _le )
_le->disabled = _prev;
}
LastError * _le;
bool _prev;
};
static LastError noError;
};
extern class LastErrorHolder {
public:
LastErrorHolder(){}
~LastErrorHolder();
LastError * get( bool create = false );
LastError * getSafe();
LastError * _get( bool create = false ); // may return a disabled LastError
void reset( LastError * le );
/** ok to call more than once. */
void initThread();
int getID();
void release();
/** when db receives a message/request, call this */
LastError * startRequest( Message& m , LastError * connectionOwned );
void disconnect( int clientId );
// used to disable lastError reporting while processing a killCursors message
// disable causes get() to return 0.
LastError *disableForCommand(); // only call once per command invocation!
private:
boost::thread_specific_ptr<LastError> _tl;
struct Status {
time_t time;
LastError *lerr;
};
} lastError;
void setLastError(int code , const char *msg);
} // namespace mongo
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