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/**
* Copyright (C) 2022-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/s/sharding_expressions.h"
#include "mongo/db/exec/document_value/document.h"
#include "mongo/db/exec/document_value/value.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/expression_context.h"
#include "mongo/db/pipeline/expression_visitor.h"
#include "mongo/db/pipeline/variables.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/s/grid.h"
#include "mongo/s/is_mongos.h"
namespace mongo {
Value ExpressionInternalOwningShard::evaluate(const Document& root, Variables* variables) const {
// TODO SERVER-71519: Add support for handling stale exception from mongos with
// enableFinerGrainedCatalogCacheRefresh.
uassert(6868600, "$_internalOwningShard is currently not supported on mongos", !isMongos());
Value input = _children[0]->evaluate(root, variables);
if (input.nullish()) {
return Value(BSONNULL);
}
// Retrieve the values from the incoming document.
NamespaceString ns(getExpressionContext()->ns.tenantId(), input["ns"_sd].getStringData());
const auto shardVersionObj = input["shardVersion"_sd].getDocument().toBson();
const auto shardVersion = ShardVersion::parse(BSON("" << shardVersionObj).firstElement());
const auto shardKeyVal = input["shardKeyVal"_sd].getDocument().toBson();
// Get the 'chunkManager' from the catalog cache.
auto opCtx = getExpressionContext()->opCtx;
const auto catalogCache = Grid::get(opCtx)->catalogCache();
uassert(6868602,
"$_internalOwningShard expression only makes sense in sharded environment",
catalogCache);
// Setting 'allowLocks' to true when evaluating on mongod, as otherwise an invariant is thrown.
// We can safely set it to true as there is no risk of deadlock, because the code still throws
// when a refresh would actually need to take place.
const auto chunkManager =
uassertStatusOK(catalogCache->getCollectionRoutingInfo(opCtx, ns, true /* allowLocks */))
.cm;
// Invalidate catalog cache if the chunk manager version is stale.
if (chunkManager.getVersion().isOlderThan(shardVersion.placementVersion())) {
boost::optional<CollectionIndexes> collIndexes;
ShardVersion currentShardVersion(chunkManager.getVersion(), collIndexes);
uasserted(StaleConfigInfo(ns,
currentShardVersion,
boost::none /* wanted */,
ShardingState::get(opCtx)->shardId()),
str::stream()
<< "Sharding information of collection " << ns
<< " is currently stale and needs to be recovered from the config server");
}
// Retrieve the shard id for the given shard key value.
std::set<ShardId> shardIds;
chunkManager.getShardIdsForRange(shardKeyVal, shardKeyVal, &shardIds);
uassert(6868601, "The value should belong to exactly one ShardId", shardIds.size() == 1);
const auto shardId = *(shardIds.begin());
return Value(shardId.toString());
}
REGISTER_STABLE_EXPRESSION(_internalOwningShard, ExpressionInternalOwningShard::parse);
}; // namespace mongo
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