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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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
#include "mongo/db/change_stream_serverless_helpers.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/global_settings.h"
#include "mongo/db/multitenancy_gen.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/server_feature_flags_gen.h"
#include "mongo/db/server_options.h"
namespace mongo {
namespace change_stream_serverless_helpers {
bool isChangeCollectionsModeActive() {
// A change collection mode is declared as active if the required services can be initialized,
// the feature flag is enabled and the FCV version is already initialized.
return canInitializeServices() &&
serverGlobalParams.featureCompatibility.isVersionInitialized() &&
feature_flags::gFeatureFlagServerlessChangeStreams.isEnabled(
serverGlobalParams.featureCompatibility);
}
bool isChangeStreamEnabled(OperationContext* opCtx, const TenantId& tenantId) {
auto catalog = CollectionCatalog::get(opCtx);
// A change stream in the serverless is declared as enabled if both the change collection and
// the pre-images collection exist for the provided tenant.
// TODO SERVER-66643 Pass 'tenantId' to the pre-images collection.
return isChangeCollectionsModeActive() &&
static_cast<bool>(catalog->lookupCollectionByNamespace(
opCtx, NamespaceString::makeChangeCollectionNSS(tenantId))) &&
static_cast<bool>(catalog->lookupCollectionByNamespace(
opCtx, NamespaceString::makePreImageCollectionNSS(boost::none)));
}
bool canInitializeServices() {
// A change collection must not be enabled on the config server.
if (serverGlobalParams.clusterRole == ClusterRole::ConfigServer) {
return false;
}
// A change stream services are enabled only in the multitenant serverless settings. For the
// sharded cluster, 'internalChangeStreamUseTenantIdForTesting' maybe provided for the testing
// purposes until the support is available.
const auto isMultiTenantServerless =
getGlobalReplSettings().isServerless() && gMultitenancySupport;
return isMultiTenantServerless || internalChangeStreamUseTenantIdForTesting.load();
}
const TenantId& getTenantIdForTesting() {
static const TenantId kTestTenantId(
OID("00000000" /* timestamp */
"0000000000" /* process id */
"000000" /* counter */));
return kTestTenantId;
}
boost::optional<TenantId> resolveTenantId(boost::optional<TenantId> tenantId) {
if (tenantId) {
return tenantId;
} else if (MONGO_unlikely(internalChangeStreamUseTenantIdForTesting.load())) {
return getTenantIdForTesting();
}
return tenantId;
}
TenantSet getConfigDbTenants(OperationContext* opCtx) {
TenantSet tenantIds;
auto dbNames = CollectionCatalog::get(opCtx)->getAllDbNames();
for (auto&& dbName : dbNames) {
if (dbName.db() == NamespaceString::kConfigDb && dbName.tenantId()) {
tenantIds.insert(*dbName.tenantId());
}
}
return tenantIds;
}
} // namespace change_stream_serverless_helpers
} // namespace mongo
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