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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
#include <string>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/timestamp.h"
#include "mongo/db/catalog/collection_options.h"
#include "mongo/db/logical_session_id.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/storage/snapshot_name.h"
#include "mongo/stdx/functional.h"
namespace mongo {
class Collection;
class Database;
class NamespaceString;
class OperationContext;
class OperationSessionInfo;
class Session;
struct OplogSlot {
OplogSlot() {}
OplogSlot(repl::OpTime opTime, std::int64_t hash) : opTime(opTime), hash(hash) {}
repl::OpTime opTime;
std::int64_t hash = 0;
};
struct InsertStatement {
public:
InsertStatement() = default;
explicit InsertStatement(BSONObj toInsert) : doc(toInsert) {}
InsertStatement(StmtId statementId, BSONObj toInsert) : stmtId(statementId), doc(toInsert) {}
InsertStatement(StmtId statementId, BSONObj toInsert, OplogSlot os)
: stmtId(statementId), oplogSlot(os), doc(toInsert) {}
InsertStatement(BSONObj toInsert, SnapshotName ts, long long term)
: oplogSlot(repl::OpTime(Timestamp(ts.asU64()), term), 0), doc(toInsert) {}
StmtId stmtId = kUninitializedStmtId;
OplogSlot oplogSlot;
BSONObj doc;
};
namespace repl {
class ReplSettings;
struct OplogLink {
OplogLink() = default;
OpTime prevOpTime;
OpTime preImageOpTime;
OpTime postImageOpTime;
};
/**
* Create a new capped collection for the oplog if it doesn't yet exist.
* If the collection already exists (and isReplSet is false),
* set the 'last' Timestamp from the last entry of the oplog collection (side effect!)
*/
void createOplog(OperationContext* opCtx, const std::string& oplogCollectionName, bool isReplSet);
/*
* Shortcut for above function using oplogCollectionName = _oplogCollectionName,
* and replEnabled = replCoord::isReplSet();
*/
void createOplog(OperationContext* opCtx);
extern std::string masterSlaveOplogName;
extern int OPLOG_VERSION;
/**
* Log insert(s) to the local oplog.
* Returns the OpTime of every insert.
*/
std::vector<OpTime> logInsertOps(OperationContext* opCtx,
const NamespaceString& nss,
OptionalCollectionUUID uuid,
Session* session,
std::vector<InsertStatement>::const_iterator begin,
std::vector<InsertStatement>::const_iterator end,
bool fromMigrate);
/**
* @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. 'o2' captures the the criteria for the object that will be modified.
*
* oplogLink this contains the timestamp that points to the previous write that will be
* linked via prevTs, and the timestamps of the oplog entry that contains the document
* before/after update was applied. The timestamps are ignored if isNull() is true.
*
* Returns the optime of the oplog entry written to the oplog.
* Returns a null optime if oplog was not modified.
*/
OpTime logOp(OperationContext* opCtx,
const char* opstr,
const NamespaceString& ns,
OptionalCollectionUUID uuid,
const BSONObj& obj,
const BSONObj* o2,
bool fromMigrate,
const OperationSessionInfo& sessionInfo,
StmtId stmtId,
const OplogLink& oplogLink);
// Flush out the cached pointer to the oplog.
// Used by the closeDatabase command to ensure we don't cache closed things.
void oplogCheckCloseDatabase(OperationContext* opCtx, Database* db);
/**
* Establish the cached pointer to the local oplog.
*/
void acquireOplogCollectionForLogging(OperationContext* opCtx);
using IncrementOpsAppliedStatsFn = stdx::function<void()>;
/**
* Take the object field of a BSONObj, the BSONObj, and the namespace of
* the operation and perform necessary validation to ensure the BSONObj is a
* properly-formed command to insert into system.indexes. This is only to
* be used for insert operations into system.indexes. It is called via applyOps.
*/
std::pair<BSONObj, NamespaceString> prepForApplyOpsIndexInsert(const BSONElement& fieldO,
const BSONObj& op,
const NamespaceString& requestNss);
/**
* Take a non-command op and apply it locally
* Used for applying from an oplog
* @param inSteadyStateReplication convert some updates to upserts for idempotency reasons
* @param incrementOpsAppliedStats is called whenever an op is applied.
* Returns failure status if the op was an update that could not be applied.
*/
Status applyOperation_inlock(OperationContext* opCtx,
Database* db,
const BSONObj& op,
bool inSteadyStateReplication = false,
IncrementOpsAppliedStatsFn incrementOpsAppliedStats = {});
/**
* Take a command op and apply it locally
* Used for applying from an oplog
* inSteadyStateReplication indicates whether we are in steady state replication, rather than
* initial sync.
* Returns failure status if the op that could not be applied.
*/
Status applyCommand_inlock(OperationContext* opCtx,
const BSONObj& op,
bool inSteadyStateReplication);
/**
* Initializes the global Timestamp with the value from the timestamp of the last oplog entry.
*/
void initTimestampFromOplog(OperationContext* opCtx, const std::string& oplogNS);
/**
* Sets the global Timestamp to be 'newTime'.
*/
void setNewTimestamp(ServiceContext* opCtx, const Timestamp& newTime);
/**
* Detects the current replication mode and sets the "_oplogCollectionName" accordingly.
*/
void setOplogCollectionName();
/**
* Signal any waiting AwaitData queries on the oplog that there is new data or metadata available.
*/
void signalOplogWaiters();
/**
* Creates a new index in the given namespace.
*/
void createIndexForApplyOps(OperationContext* opCtx,
const BSONObj& indexSpec,
const NamespaceString& indexNss,
IncrementOpsAppliedStatsFn incrementOpsAppliedStats);
/**
* Allocates optimes for new entries in the oplog. Returns an OplogSlot or a vector of OplogSlots,
* which contain the new optimes along with their terms and newly calculated hash fields.
*/
OplogSlot getNextOpTime(OperationContext* opCtx);
std::vector<OplogSlot> getNextOpTimes(OperationContext* opCtx, std::size_t count);
} // namespace repl
} // namespace mongo
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