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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/>.
*
* 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/platform/basic.h"
#include <string>
#include "mongo/db/client.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/fts/fts_command.h"
#include "mongo/db/fts/fts_util.h"
#include "mongo/db/query/get_runner.h"
#include "mongo/db/query/type_explain.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/timer.h"
namespace mongo {
namespace fts {
/*
* 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(OperationContext* txn,
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;
// Rewrite the cmd as a normal query.
BSONObjBuilder queryBob;
queryBob.appendElements(filter);
BSONObjBuilder textBob;
textBob.append("$search", searchString);
if (!language.empty()) {
textBob.append("$language", language);
}
queryBob.append("$text", textBob.obj());
// This is the query we exec.
BSONObj queryObj = queryBob.obj();
// We sort by the score.
BSONObj sortSpec = BSON("$s" << BSON("$meta" << LiteParsedQuery::metaTextScore));
// We also project the score into the document and strip it out later during the reformatting
// of the results.
BSONObjBuilder projBob;
projBob.appendElements(projection);
projBob.appendElements(sortSpec);
BSONObj projObj = projBob.obj();
Client::ReadContext ctx(txn, ns);
CanonicalQuery* cq;
Status canonicalizeStatus =
CanonicalQuery::canonicalize(ns,
queryObj,
sortSpec,
projObj,
0,
limit,
BSONObj(),
&cq,
WhereCallbackReal(StringData(dbname)));
if (!canonicalizeStatus.isOK()) {
errmsg = canonicalizeStatus.reason();
return false;
}
Runner* rawRunner;
Status getRunnerStatus = getRunner(ctx.ctx().db()->getCollection(txn, ns), cq, &rawRunner);
if (!getRunnerStatus.isOK()) {
errmsg = getRunnerStatus.reason();
return false;
}
auto_ptr<Runner> runner(rawRunner);
BSONArrayBuilder resultBuilder(result.subarrayStart("results"));
// Quoth: "leave a mb for other things"
int resultSize = 1024 * 1024;
int numReturned = 0;
BSONObj obj;
while (Runner::RUNNER_ADVANCED == runner->getNext(&obj, NULL)) {
if ((resultSize + obj.objsize()) >= BSONObjMaxUserSize) {
break;
}
// We return an array of results. Add another element.
BSONObjBuilder oneResultBuilder(resultBuilder.subobjStart());
oneResultBuilder.append("score", obj["$s"].number());
// Strip out the score from the returned obj.
BSONObjIterator resIt(obj);
BSONObjBuilder resBob;
while (resIt.more()) {
BSONElement elt = resIt.next();
if (!mongoutils::str::equals("$s", elt.fieldName())) {
resBob.append(elt);
}
}
oneResultBuilder.append("obj", resBob.obj());
BSONObj addedArrayObj = oneResultBuilder.done();
resultSize += addedArrayObj.objsize();
numReturned++;
}
resultBuilder.done();
// returns some stats to the user
BSONObjBuilder stats(result.subobjStart("stats"));
// Fill in nscanned from the explain.
TypeExplain* bareExplain;
Status res = runner->getInfo(&bareExplain, NULL);
if (res.isOK()) {
auto_ptr<TypeExplain> explain(bareExplain);
stats.append("nscanned", explain->getNScanned());
stats.append("nscannedObjects", explain->getNScannedObjects());
}
stats.appendNumber( "n" , numReturned );
stats.append( "timeMicros", (int)comm.micros() );
stats.done();
return true;
}
} // namespace fts
} // namespace mongo
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