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/**
* Copyright (C) 2008 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
namespace mongo {
class BSONObj;
class Database;
class OperationContext;
class OpTime;
namespace repl {
// These functions redefine the function for logOp(),
// for either master/slave or replica sets.
void oldRepl(); // master-slave
void newRepl(); // replica set starting up
void newReplUp();// replica set after startup
// Create a new capped collection for the oplog if it doesn't yet exist.
// This will be either local.oplog.rs (replica sets) or local.oplog.$main (master/slave)
// If the collection already exists, set the 'last' OpTime if master/slave (side effect!)
void createOplog();
// This poorly-named function writes an op into the replica-set oplog;
// used internally by replication secondaries after they have applied an op
void _logOpObjRS(const BSONObj& op);
const char rsoplog[] = "local.oplog.rs";
/** Log an operation to the local oplog
@param opstr
"i" insert
"u" update
"d" delete
"c" db cmd
"n" no-op
"db" declares presence of a database (ns is set to the db name + '.')
For 'u' records, 'obj' captures the mutation made to the object but not
the object itself. In that case, we provide also 'fullObj' which is the
image of the object _after_ the mutation logged here was applied.
See _logOp() in oplog.cpp for more details.
*/
void logOp( OperationContext* txn,
const char *opstr,
const char *ns,
const BSONObj& obj,
BSONObj *patt = NULL,
bool *b = NULL,
bool fromMigrate = false);
// Log an empty no-op operation to the local oplog
void logKeepalive();
/** puts obj in the oplog as a comment (a no-op). Just for diags.
convention is
{ msg : "text", ... }
*/
void logOpComment(const BSONObj& obj);
// Flush out the cached pointers to the local database and oplog.
// Used by the closeDatabase command to ensure we don't cache closed things.
void oplogCheckCloseDatabase( Database * db );
/**
* take an op and apply locally
* used for applying from an oplog
* @param fromRepl really from replication or for testing/internal/command/etc...
* @param convertUpdateToUpsert convert some updates to upserts for idempotency reasons
* Returns if the op was an update that could not be applied (true on failure)
*/
bool applyOperation_inlock(OperationContext* txn,
Database* db,
const BSONObj& op,
bool fromRepl = true,
bool convertUpdateToUpsert = false);
/**
* Waits until the given timeout for the OpTime from the oplog to change.
* Returns true if the OpTime changed occured before the timeout.
*/
bool waitForOptimeChange(const OpTime& referenceTime, unsigned timeoutMillis);
/**
* Initializes the global OpTime with the value from the timestamp of the last oplog entry.
*/
void initOpTimeFromOplog(const std::string& oplogNS);
} // namespace repl
} // namespace mongo
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