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141 lines
4.4 KiB
C++
141 lines
4.4 KiB
C++
// oplog.h - writing to and reading from oplog
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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local.oplog.$main is the default
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*/
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#pragma once
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#include "pdfile.h"
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#include "db.h"
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#include "dbhelpers.h"
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#include "clientcursor.h"
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#include "../client/dbclient.h"
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#include "../util/optime.h"
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#include "../util/timer.h"
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namespace mongo {
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void createOplog();
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void _logOpObjRS(const BSONObj& op);
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/** Write operation to the log (local.oplog.$main)
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@param opstr
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"i" insert
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"u" update
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"d" delete
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"c" db cmd
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"n" no-op
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"db" declares presence of a database (ns is set to the db name + '.')
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See _logOp() in oplog.cpp for more details.
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*/
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void logOp(const char *opstr, const char *ns, const BSONObj& obj, BSONObj *patt = 0, bool *b = 0);
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void logKeepalive();
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/** puts obj in the oplog as a comment (a no-op). Just for diags.
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convention is
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{ msg : "text", ... }
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*/
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void logOpComment(const BSONObj& obj);
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void oplogCheckCloseDatabase( Database * db );
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extern int __findingStartInitialTimeout; // configurable for testing
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class QueryPlan;
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/** Implements an optimized procedure for finding the first op in the oplog. */
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class FindingStartCursor {
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public:
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/**
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* The cursor will attempt to find the first op in the oplog matching the
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* 'ts' field of the qp's query.
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*/
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FindingStartCursor( const QueryPlan & qp );
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/** @return true if the first matching op in the oplog has been found. */
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bool done() const { return !_findingStart; }
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/** @return cursor pointing to the first matching op, if done(). */
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shared_ptr<Cursor> cursor() { verify( 14835, done() ); return _c; }
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/** Iterate the cursor, to continue trying to find matching op. */
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void next();
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/** Yield cursor, if not done(). */
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bool prepareToYield() {
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if ( _findingStartCursor ) {
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return _findingStartCursor->prepareToYield( _yieldData );
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}
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return false;
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}
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/** Recover from cursor yield. */
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void recoverFromYield() {
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if ( _findingStartCursor ) {
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if ( !ClientCursor::recoverFromYield( _yieldData ) ) {
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_findingStartCursor.reset( 0 );
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msgassertedNoTrace( 15889, "FindingStartCursor::recoverFromYield() failed to recover" );
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}
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}
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}
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private:
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enum FindingStartMode { Initial, FindExtent, InExtent };
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const QueryPlan &_qp;
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bool _findingStart;
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FindingStartMode _findingStartMode;
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auto_ptr< CoveredIndexMatcher > _matcher;
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Timer _findingStartTimer;
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ClientCursor::CleanupPointer _findingStartCursor;
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shared_ptr<Cursor> _c;
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ClientCursor::YieldData _yieldData;
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DiskLoc extentFirstLoc( const DiskLoc &rec );
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DiskLoc prevExtentFirstLoc( const DiskLoc &rec );
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void createClientCursor( const DiskLoc &startLoc = DiskLoc() );
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void destroyClientCursor() {
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_findingStartCursor.reset( 0 );
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}
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void init();
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bool firstDocMatchesOrEmpty() const;
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};
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void pretouchOperation(const BSONObj& op);
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void pretouchN(vector<BSONObj>&, unsigned a, unsigned b);
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/**
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* take an op and apply locally
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* used for applying from an oplog
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* @param fromRepl really from replication or for testing/internal/command/etc...
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* Returns if the op was an update that could not be applied (true on failure)
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*/
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bool applyOperation_inlock(const BSONObj& op , bool fromRepl = true );
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/**
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* If applyOperation_inlock should be called again after an update fails.
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*/
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bool shouldRetry(const BSONObj& op , const string& hn);
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}
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