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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/idl/cluster_server_parameter_op_observer.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/idl/cluster_parameter_synchronization_helpers.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kControl
namespace mongo {
namespace {
constexpr auto kIdField = "_id"_sd;
constexpr auto kOplog = "oplog"_sd;
/**
* Per-operation scratch space indicating the document being deleted and the tenantId of the tenant
* associated. This is used in the aboutToDelte/onDelete handlers since the document is not
* necessarily available in the latter.
*/
const auto aboutToDeleteDoc = OperationContext::declareDecoration<std::string>();
const auto tenantIdToDelete = OperationContext::declareDecoration<boost::optional<TenantId>>();
bool isConfigNamespace(const NamespaceString& nss) {
return nss == NamespaceString::makeClusterParametersNSS(nss.dbName().tenantId());
}
} // namespace
void ClusterServerParameterOpObserver::onInserts(OperationContext* opCtx,
const CollectionPtr& coll,
std::vector<InsertStatement>::const_iterator first,
std::vector<InsertStatement>::const_iterator last,
std::vector<bool> fromMigrate,
bool defaultFromMigrate,
InsertsOpStateAccumulator* opAccumulator) {
if (!isConfigNamespace(coll->ns())) {
return;
}
for (auto it = first; it != last; ++it) {
opCtx->recoveryUnit()->onCommit([doc = it->doc, tenantId = coll->ns().dbName().tenantId()](
OperationContext* opCtx, boost::optional<Timestamp>) {
cluster_parameters::updateParameter(opCtx, doc, kOplog, tenantId);
});
}
}
void ClusterServerParameterOpObserver::onUpdate(OperationContext* opCtx,
const OplogUpdateEntryArgs& args,
OpStateAccumulator* opAccumulator) {
auto updatedDoc = args.updateArgs->updatedDoc;
if (!isConfigNamespace(args.coll->ns()) || args.updateArgs->update.isEmpty()) {
return;
}
opCtx->recoveryUnit()->onCommit([updatedDoc, tenantId = args.coll->ns().dbName().tenantId()](
OperationContext* opCtx, boost::optional<Timestamp>) {
cluster_parameters::updateParameter(opCtx, updatedDoc, kOplog, tenantId);
});
}
void ClusterServerParameterOpObserver::aboutToDelete(OperationContext* opCtx,
const CollectionPtr& coll,
const BSONObj& doc) {
std::string docBeingDeleted;
if (isConfigNamespace(coll->ns())) {
// Store the tenantId associated with the doc to be deleted.
tenantIdToDelete(opCtx) = coll->ns().dbName().tenantId();
auto elem = doc[kIdField];
if (elem.type() == String) {
docBeingDeleted = elem.str();
} else {
// This delete makes no sense,
// but it's safe to ignore since the insert/update
// would not have resulted in an in-memory update anyway.
LOGV2_DEBUG(6226304,
3,
"Deleting a cluster-wide server parameter with non-string name",
"name"_attr = elem);
}
}
// Stash the name of the config doc being deleted (if any)
// in an opCtx decoration for use in the onDelete() hook below
// since OpLogDeleteEntryArgs isn't guaranteed to have the deleted doc.
aboutToDeleteDoc(opCtx) = std::move(docBeingDeleted);
}
void ClusterServerParameterOpObserver::onDelete(OperationContext* opCtx,
const CollectionPtr& coll,
StmtId stmtId,
const OplogDeleteEntryArgs& args,
OpStateAccumulator* opAccumulator) {
const auto& docName = aboutToDeleteDoc(opCtx);
if (!docName.empty()) {
opCtx->recoveryUnit()->onCommit([docName, tenantId = tenantIdToDelete(opCtx)](
OperationContext* opCtx, boost::optional<Timestamp>) {
cluster_parameters::clearParameter(opCtx, docName, tenantId);
});
}
}
void ClusterServerParameterOpObserver::onDropDatabase(OperationContext* opCtx,
const DatabaseName& dbName) {
if (dbName.db() == DatabaseName::kConfig.db()) {
// Entire config DB deleted, reset to default state.
opCtx->recoveryUnit()->onCommit(
[tenantId = dbName.tenantId()](OperationContext* opCtx, boost::optional<Timestamp>) {
cluster_parameters::clearAllTenantParameters(opCtx, tenantId);
});
}
}
repl::OpTime ClusterServerParameterOpObserver::onDropCollection(
OperationContext* opCtx,
const NamespaceString& collectionName,
const UUID& uuid,
std::uint64_t numRecords,
CollectionDropType dropType) {
if (isConfigNamespace(collectionName)) {
// Entire collection deleted, reset to default state.
opCtx->recoveryUnit()->onCommit([tenantId = collectionName.dbName().tenantId()](
OperationContext* opCtx, boost::optional<Timestamp>) {
cluster_parameters::clearAllTenantParameters(opCtx, tenantId);
});
}
return {};
}
void ClusterServerParameterOpObserver::_onReplicationRollback(OperationContext* opCtx,
const RollbackObserverInfo& rbInfo) {
for (const auto& nss : rbInfo.rollbackNamespaces) {
if (isConfigNamespace(nss)) {
// We can call resynchronize directly because onReplicationRollback is guaranteed to be
// called from a state with no active WUOW and no database locks.
cluster_parameters::resynchronizeAllTenantParametersFromDisk(opCtx,
nss.dbName().tenantId());
}
}
}
} // namespace mongo
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