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/**
* Copyright (C) 2015 MongoDB 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/s/commands/cluster_commands_common.h"
#include "mongo/db/commands.h"
#include "mongo/db/query/cursor_responses.h"
#include "mongo/s/cursors.h"
namespace mongo {
int getUniqueCodeFromCommandResults(const std::vector<Strategy::CommandResult>& results) {
int commonErrCode = -1;
for (std::vector<Strategy::CommandResult>::const_iterator it = results.begin();
it != results.end();
++it) {
// Only look at shards with errors.
if (!it->result["ok"].trueValue()) {
int errCode = it->result["code"].numberInt();
if (commonErrCode == -1) {
commonErrCode = errCode;
}
else if (commonErrCode != errCode) {
// At least two shards with errors disagree on the error code
commonErrCode = 0;
}
}
}
// If no error encountered or shards with errors disagree on the error code, return 0
if (commonErrCode == -1 || commonErrCode == 0) {
return 0;
}
// Otherwise, shards with errors agree on the error code; return that code
return commonErrCode;
}
bool appendEmptyResultSet(BSONObjBuilder& result, Status status, const std::string& ns) {
invariant(!status.isOK());
if (status == ErrorCodes::DatabaseNotFound) {
// Old style reply
result << "result" << BSONArray();
// New (command) style reply
appendCursorResponseObject(0LL, ns, BSONArray(), &result);
return true;
}
return Command::appendCommandStatus(result, status);
}
Status storePossibleCursor(const std::string& server, const BSONObj& cmdResult) {
if (cmdResult["ok"].trueValue() && cmdResult.hasField("cursor")) {
BSONElement cursorIdElt = cmdResult.getFieldDotted("cursor.id");
if (cursorIdElt.type() != mongo::NumberLong) {
return Status(ErrorCodes::TypeMismatch,
str::stream() << "expected \"cursor.id\" field from shard "
<< "response to have NumberLong type, instead "
<< "got: " << typeName(cursorIdElt.type()));
}
const long long cursorId = cursorIdElt.Long();
if (cursorId != 0) {
BSONElement cursorNsElt = cmdResult.getFieldDotted("cursor.ns");
if (cursorNsElt.type() != mongo::String) {
return Status(ErrorCodes::TypeMismatch,
str::stream() << "expected \"cursor.ns\" field from "
<< "shard response to have String type, "
<< "instead got: "
<< typeName(cursorNsElt.type()));
}
const std::string cursorNs = cursorNsElt.String();
cursorCache.storeRef(server, cursorId, cursorNs);
}
}
return Status::OK();
}
} // namespace mongo
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