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// fts_command_mongod.h
/**
* Copyright (C) 2012 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/>.
*/
#include <algorithm>
#include <string>
#include <vector>
#include "mongo/db/fts/fts_command.h"
#include "mongo/db/fts/fts_search.h"
#include "mongo/db/fts/fts_util.h"
#include "mongo/db/index/catalog_hack.h"
#include "mongo/db/index/fts_access_method.h"
#include "mongo/db/pdfile.h"
#include "mongo/db/projection.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/timer.h"
namespace mongo {
namespace fts {
Command::LockType FTSCommand::locktype() const {
return READ;
}
/*
* Runs the command object cmdobj on the db with name dbname and puts result in result.
* @param dbname, name of db
* @param cmdobj, object that contains entire command
* @param options
* @param errmsg, reference to error message
* @param result, reference to builder for result
* @param fromRepl
* @return true if successful, false otherwise
*/
bool FTSCommand::_run(const string& dbname,
BSONObj& cmdObj,
int cmdOptions,
const string& ns,
const string& searchString,
string language, // "" for not-set
int limit,
BSONObj& filter,
BSONObj& projection,
string& errmsg,
BSONObjBuilder& result ) {
Timer comm;
scoped_ptr<Projection> pr;
if ( !projection.isEmpty() ) {
pr.reset( new Projection() );
pr->init( projection );
}
// priority queue for results
Results results;
NamespaceDetails * d = nsdetails( ns.c_str() );
if ( !d ) {
errmsg = "can't find ns";
return false;
}
vector<int> idxMatches;
d->findIndexByType( INDEX_NAME, idxMatches );
if ( idxMatches.size() == 0 ) {
errmsg = str::stream() << "no text index for: " << ns;
return false;
}
if ( idxMatches.size() > 1 ) {
errmsg = str::stream() << "too many text index for: " << ns;
return false;
}
BSONObj indexPrefix;
auto_ptr<IndexDescriptor> descriptor(CatalogHack::getDescriptor(d, idxMatches[0]));
auto_ptr<FTSAccessMethod> fam(new FTSAccessMethod(descriptor.get()));
if ( language == "" ) {
language = fam->getSpec().defaultLanguage();
}
Status s = fam->getSpec().getIndexPrefix( filter, &indexPrefix );
if ( !s.isOK() ) {
errmsg = s.toString();
return false;
}
FTSQuery query;
if ( !query.parse( searchString, language ).isOK() ) {
errmsg = "can't parse search";
return false;
}
result.append( "queryDebugString", query.debugString() );
result.append( "language", language );
FTSSearch search(descriptor.get(), fam->getSpec(), indexPrefix, query, filter );
search.go( &results, limit );
// grab underlying container inside priority queue
vector<ScoredLocation> r( results.dangerous() );
// sort results by score (not always in correct order, especially w.r.t. multiterm)
sort( r.begin(), r.end() );
// build the results bson array shown to user
BSONArrayBuilder a( result.subarrayStart( "results" ) );
int tempSize = 1024 * 1024; // leave a mb for other things
long long numReturned = 0;
for ( unsigned n = 0; n < r.size(); n++ ) {
BSONObj obj = BSONObj::make(r[n].rec);
BSONObj toSendBack = obj;
if ( pr ) {
toSendBack = pr->transform(obj);
}
if ( ( tempSize + toSendBack.objsize() ) >= BSONObjMaxUserSize ) {
break;
}
BSONObjBuilder x( a.subobjStart() );
x.append( "score" , r[n].score );
x.append( "obj", toSendBack );
BSONObj xobj = x.done();
tempSize += xobj.objsize();
numReturned++;
}
a.done();
// returns some stats to the user
BSONObjBuilder bb( result.subobjStart( "stats" ) );
bb.appendNumber( "nscanned" , search.getKeysLookedAt() );
bb.appendNumber( "nscannedObjects" , search.getObjLookedAt() );
bb.appendNumber( "n" , numReturned );
bb.appendNumber( "nfound" , r.size() );
bb.append( "timeMicros", (int)comm.micros() );
bb.done();
return true;
}
}
}
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