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/**
* Copyright 2011 (c) 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 "mongo/pch.h"
#include "mongo/db/pipeline/document_source.h"
#include "mongo/db/pipeline/document.h"
namespace mongo {
char DocumentSourceGeoNear::geoNearName[] = "$geoNear";
const char *DocumentSourceGeoNear::getSourceName() const { return geoNearName; }
boost::optional<Document> DocumentSourceGeoNear::getNext() {
pExpCtx->checkForInterrupt();
if (!resultsIterator)
runCommand();
if (!resultsIterator->more())
return boost::none;
// each result from the geoNear command is wrapped in a wrapper object with "obj",
// "dis" and maybe "loc" fields. We want to take the object from "obj" and inject the
// other fields into it.
Document result (resultsIterator->next().embeddedObject());
MutableDocument output (result["obj"].getDocument());
output.setNestedField(*distanceField, result["dis"]);
if (includeLocs)
output.setNestedField(*includeLocs, result["loc"]);
return output.freeze();
}
void DocumentSourceGeoNear::setSource(DocumentSource*) {
uasserted(16602, "$geoNear is only allowed as the first pipeline stage");
}
bool DocumentSourceGeoNear::coalesce(const intrusive_ptr<DocumentSource> &pNextSource) {
DocumentSourceLimit* limitSrc = dynamic_cast<DocumentSourceLimit*>(pNextSource.get());
if (limitSrc) {
limit = min(limit, limitSrc->getLimit());
return true;
}
return false;
}
// This command is sent as-is to the shards.
// On router this becomes a sort by distance (nearest-first) with limit.
intrusive_ptr<DocumentSource> DocumentSourceGeoNear::getShardSource() { return this; }
intrusive_ptr<DocumentSource> DocumentSourceGeoNear::getRouterSource() {
return DocumentSourceSort::create(pExpCtx,
BSON(distanceField->getPath(false) << 1),
limit);
}
Value DocumentSourceGeoNear::serialize(bool explain) const {
MutableDocument result;
if (coordsIsArray) {
result.setField("near", Value(BSONArray(coords)));
}
else {
result.setField("near", Value(coords));
}
// not in buildGeoNearCmd
result.setField("distanceField", Value(distanceField->getPath(false)));
result.setField("limit", Value(limit));
if (maxDistance > 0)
result.setField("maxDistance", Value(maxDistance));
result.setField("query", Value(query));
result.setField("spherical", Value(spherical));
result.setField("distanceMultiplier", Value(distanceMultiplier));
if (includeLocs)
result.setField("includeLocs", Value(includeLocs->getPath(false)));
result.setField("uniqueDocs", Value(uniqueDocs));
return Value(DOC(getSourceName() << result.freeze()));
}
BSONObj DocumentSourceGeoNear::buildGeoNearCmd() const {
// this is very similar to sourceToBson, but slightly different.
// differences will be noted.
BSONObjBuilder geoNear; // not building a subField
geoNear.append("geoNear", pExpCtx->ns.coll()); // not in toBson
if (coordsIsArray) {
geoNear.appendArray("near", coords);
}
else {
geoNear.append("near", coords);
}
geoNear.append("num", limit); // called limit in toBson
if (maxDistance > 0)
geoNear.append("maxDistance", maxDistance);
geoNear.append("query", query);
geoNear.append("spherical", spherical);
geoNear.append("distanceMultiplier", distanceMultiplier);
if (includeLocs)
geoNear.append("includeLocs", true); // String in toBson
geoNear.append("uniqueDocs", uniqueDocs);
return geoNear.obj();
}
void DocumentSourceGeoNear::runCommand() {
massert(16603, "Already ran geoNearCommand",
!resultsIterator);
bool ok = _mongod->directClient()->runCommand(pExpCtx->ns.db().toString(),
buildGeoNearCmd(),
cmdOutput);
uassert(16604, "geoNear command failed: " + cmdOutput.toString(),
ok);
resultsIterator.reset(new BSONObjIterator(cmdOutput["results"].embeddedObject()));
}
intrusive_ptr<DocumentSourceGeoNear> DocumentSourceGeoNear::create(
const intrusive_ptr<ExpressionContext> &pCtx) {
return new DocumentSourceGeoNear(pCtx);
}
intrusive_ptr<DocumentSource> DocumentSourceGeoNear::createFromBson(
BSONElement *pBsonElement,
const intrusive_ptr<ExpressionContext> &pCtx) {
intrusive_ptr<DocumentSourceGeoNear> out = new DocumentSourceGeoNear(pCtx);
out->parseOptions(pBsonElement->embeddedObjectUserCheck());
return out;
}
void DocumentSourceGeoNear::parseOptions(BSONObj options) {
// near and distanceField are required
uassert(16605, "$geoNear requires a 'near' option as an Array",
options["near"].isABSONObj()); // Array or Object (Object is deprecated)
coordsIsArray = options["near"].type() == Array;
coords = options["near"].embeddedObject().getOwned();
uassert(16606, "$geoNear requires a 'distanceField' option as a String",
options["distanceField"].type() == String);
distanceField.reset(new FieldPath(options["distanceField"].str()));
// remaining fields are optional
// num and limit are synonyms
if (options["limit"].isNumber())
limit = options["limit"].numberLong();
if (options["num"].isNumber())
limit = options["num"].numberLong();
if (options["maxDistance"].isNumber())
maxDistance = options["maxDistance"].numberDouble();
if (options["query"].type() == Object)
query = options["query"].embeddedObject().getOwned();
spherical = options["spherical"].trueValue();
if (options["distanceMultiplier"].isNumber())
distanceMultiplier = options["distanceMultiplier"].numberDouble();
if (options.hasField("includeLocs")) {
uassert(16607, "$geoNear requires that 'includeLocs' option is a String",
options["includeLocs"].type() == String);
includeLocs.reset(new FieldPath(options["includeLocs"].str()));
}
uniqueDocs = options["uniqueDocs"].trueValue();
}
DocumentSourceGeoNear::DocumentSourceGeoNear(const intrusive_ptr<ExpressionContext> &pExpCtx)
: SplittableDocumentSource(pExpCtx)
, coordsIsArray(false)
, limit(100)
, maxDistance(-1.0)
, spherical(false)
, distanceMultiplier(1.0)
, uniqueDocs(true)
{}
}
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