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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/>.
*
* 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 "mongo/db/pipeline/document_source.h"
#include "mongo/s/client/shard.h"
namespace mongo {
using boost::intrusive_ptr;
using std::vector;
void DocumentSourceCommandShards::setSource(DocumentSource* pSource) {
/* this doesn't take a source */
verify(false);
}
Value DocumentSourceCommandShards::serialize(bool explain) const {
// this has no BSON equivalent
verify(false);
}
DocumentSourceCommandShards::DocumentSourceCommandShards(
const ShardOutput& shardOutput, const intrusive_ptr<ExpressionContext>& pExpCtx)
: DocumentSource(pExpCtx),
unstarted(true),
hasCurrent(false),
newSource(false),
pBsonSource(),
pCurrent(),
iterator(shardOutput.begin()),
listEnd(shardOutput.end()) {}
intrusive_ptr<DocumentSourceCommandShards> DocumentSourceCommandShards::create(
const ShardOutput& shardOutput, const intrusive_ptr<ExpressionContext>& pExpCtx) {
intrusive_ptr<DocumentSourceCommandShards> pSource(
new DocumentSourceCommandShards(shardOutput, pExpCtx));
return pSource;
}
namespace {
BSONArray extractResultsArray(const Strategy::CommandResult& result) {
/* grab the next command result */
BSONObj resultObj = result.result;
uassert(16390,
str::stream() << "sharded pipeline failed on shard " << result.shardTargetId << ": "
<< resultObj.toString(),
resultObj["ok"].trueValue());
/* grab the result array out of the shard server's response */
BSONElement resultArray = resultObj["result"];
massert(16391,
str::stream() << "no result array? shard:" << result.shardTargetId << ": "
<< resultObj.toString(),
resultArray.type() == Array);
return BSONArray(resultArray.Obj());
}
}
vector<BSONArray> DocumentSourceCommandShards::getArrays() {
vector<BSONArray> out;
for (; iterator != listEnd; ++iterator) {
out.push_back(extractResultsArray(*iterator));
}
return out;
}
boost::optional<Document> DocumentSourceCommandShards::getNext() {
pExpCtx->checkForInterrupt();
while (true) {
if (!pBsonSource.get()) {
/* if there aren't any more futures, we're done */
if (iterator == listEnd)
return boost::none;
BSONArray resultArray = extractResultsArray(*iterator);
// done with error checking, don't need the shard name anymore
++iterator;
if (resultArray.isEmpty()) {
// this shard had no results, on to the next one
continue;
}
pBsonSource = DocumentSourceBsonArray::create(resultArray, pExpCtx);
}
if (boost::optional<Document> out = pBsonSource->getNext())
return out;
// Source exhausted. Try next.
pBsonSource.reset();
}
}
}
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