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// collection_to_capped.cpp
/**
* Copyright (C) 2013 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.
*/
#include "mongo/db/background.h"
#include "mongo/db/client.h"
#include "mongo/db/commands.h"
#include "mongo/db/index_builder.h"
#include "mongo/db/pdfile.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/db/query/new_find.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/storage/mmap_v1/dur_transaction.h"
namespace mongo {
Status cloneCollectionAsCapped( TransactionExperiment* txn,
Database* db,
const string& shortFrom,
const string& shortTo,
double size,
bool temp,
bool logForReplication ) {
string fromNs = db->name() + "." + shortFrom;
string toNs = db->name() + "." + shortTo;
Collection* fromCollection = db->getCollection( txn, fromNs );
if ( !fromCollection )
return Status( ErrorCodes::NamespaceNotFound,
str::stream() << "source collection " << fromNs << " does not exist" );
if ( db->getCollection( toNs ) )
return Status( ErrorCodes::NamespaceExists, "to collection already exists" );
// create new collection
{
Client::Context ctx( toNs );
BSONObjBuilder spec;
spec.appendBool( "capped", true );
spec.append( "size", size );
if ( temp )
spec.appendBool( "temp", true );
Status status = userCreateNS( txn, ctx.db(), toNs, spec.done(), logForReplication );
if ( !status.isOK() )
return status;
}
Collection* toCollection = db->getCollection( txn, toNs );
invariant( toCollection ); // we created above
// how much data to ignore because it won't fit anyway
// datasize and extentSize can't be compared exactly, so add some padding to 'size'
long long excessSize =
static_cast<long long>( fromCollection->dataSize() -
( toCollection->getRecordStore()->storageSize() * 2 ) );
scoped_ptr<Runner> runner( InternalPlanner::collectionScan(fromNs,
fromCollection,
InternalPlanner::FORWARD ) );
while ( true ) {
BSONObj obj;
Runner::RunnerState state = runner->getNext(&obj, NULL);
switch( state ) {
case Runner::RUNNER_EOF:
return Status::OK();
case Runner::RUNNER_DEAD:
db->dropCollection( txn, toNs );
return Status( ErrorCodes::InternalError, "runner turned dead while iterating" );
case Runner::RUNNER_ERROR:
return Status( ErrorCodes::InternalError, "runner error while iterating" );
case Runner::RUNNER_ADVANCED:
if ( excessSize > 0 ) {
excessSize -= ( 4 * obj.objsize() ); // 4x is for padding, power of 2, etc...
continue;
}
toCollection->insertDocument( txn, obj, true );
if ( logForReplication )
logOp( txn, "i", toNs.c_str(), obj );
txn->commitIfNeeded();
}
}
invariant( false ); // unreachable
}
/* convertToCapped seems to use this */
class CmdCloneCollectionAsCapped : public Command {
public:
CmdCloneCollectionAsCapped() : Command( "cloneCollectionAsCapped" ) {}
virtual bool slaveOk() const { return false; }
virtual bool isWriteCommandForConfigServer() const { return true; }
virtual void help( stringstream &help ) const {
help << "{ cloneCollectionAsCapped:<fromName>, toCollection:<toName>, size:<sizeInBytes> }";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet sourceActions;
sourceActions.addAction(ActionType::find);
out->push_back(Privilege(parseResourcePattern(dbname, cmdObj), sourceActions));
ActionSet targetActions;
targetActions.addAction(ActionType::insert);
targetActions.addAction(ActionType::createIndex);
targetActions.addAction(ActionType::convertToCapped);
std::string collection = cmdObj.getStringField("toCollection");
uassert(16708, "bad 'toCollection' value", !collection.empty());
out->push_back(Privilege(ResourcePattern::forExactNamespace(
NamespaceString(dbname, collection)),
targetActions));
}
bool newRun(TransactionExperiment* txn, const string& dbname, BSONObj& jsobj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl ) {
string from = jsobj.getStringField( "cloneCollectionAsCapped" );
string to = jsobj.getStringField( "toCollection" );
double size = jsobj.getField( "size" ).number();
bool temp = jsobj.getField( "temp" ).trueValue();
if ( from.empty() || to.empty() || size == 0 ) {
errmsg = "invalid command spec";
return false;
}
Lock::DBWrite dbXLock(dbname);
Client::Context ctx(dbname);
Status status = cloneCollectionAsCapped( txn, ctx.db(), from, to, size, temp, true );
return appendCommandStatus( result, status );
}
} cmdCloneCollectionAsCapped;
/* jan2010:
Converts the given collection to a capped collection w/ the specified size.
This command is not highly used, and is not currently supported with sharded
environments.
*/
class CmdConvertToCapped : public Command {
public:
CmdConvertToCapped() : Command( "convertToCapped" ) {}
virtual bool slaveOk() const { return false; }
virtual bool isWriteCommandForConfigServer() const { return true; }
virtual void help( stringstream &help ) const {
help << "{ convertToCapped:<fromCollectionName>, size:<sizeInBytes> }";
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) {
ActionSet actions;
actions.addAction(ActionType::convertToCapped);
out->push_back(Privilege(parseResourcePattern(dbname, cmdObj), actions));
}
virtual std::vector<BSONObj> stopIndexBuilds(Database* db,
const BSONObj& cmdObj) {
std::string collName = cmdObj.firstElement().valuestr();
std::string ns = db->name() + "." + collName;
IndexCatalog::IndexKillCriteria criteria;
criteria.ns = ns;
Collection* coll = db->getCollection(ns);
if (coll) {
return IndexBuilder::killMatchingIndexBuilds(coll, criteria);
}
return std::vector<BSONObj>();
}
bool newRun(TransactionExperiment* txn, const string& dbname, BSONObj& jsobj, int, string& errmsg, BSONObjBuilder& result, bool fromRepl ) {
// calls renamecollection which does a global lock, so we must too:
//
Lock::GlobalWrite globalWriteLock;
Client::Context ctx(dbname);
Database* db = ctx.db();
stopIndexBuilds(db, jsobj);
BackgroundOperation::assertNoBgOpInProgForDb(dbname.c_str());
string shortSource = jsobj.getStringField( "convertToCapped" );
string longSource = dbname + "." + shortSource;
double size = jsobj.getField( "size" ).number();
if ( shortSource.empty() || size == 0 ) {
errmsg = "invalid command spec";
return false;
}
string shortTmpName = str::stream() << "tmp.convertToCapped." << shortSource;
string longTmpName = str::stream() << dbname << "." << shortTmpName;
if ( db->getCollection( longTmpName ) ) {
Status status = db->dropCollection( txn, longTmpName );
if ( !status.isOK() )
return appendCommandStatus( result, status );
}
Status status = cloneCollectionAsCapped( txn, db, shortSource, shortTmpName, size, true, false );
if ( !status.isOK() )
return appendCommandStatus( result, status );
verify( db->getCollection( longTmpName ) );
status = db->dropCollection( txn, longSource );
if ( !status.isOK() )
return appendCommandStatus( result, status );
status = db->renameCollection( txn, longTmpName, longSource, false );
if ( !status.isOK() )
return appendCommandStatus( result, status );
if (!fromRepl)
logOp(txn, "c",(dbname + ".$cmd").c_str(), jsobj);
return true;
}
} cmdConvertToCapped;
}
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