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/**
* Copyright (C) 2021-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::kReplication
#include "mongo/platform/basic.h"
#include "mongo/db/repl/tenant_migration_access_blocker_util.h"
#include "mongo/db/repl/tenant_migration_recipient_access_blocker.h"
#include "mongo/db/repl/tenant_migration_recipient_op_observer.h"
#include "mongo/db/repl/tenant_migration_state_machine_gen.h"
#include "mongo/logv2/log.h"
namespace mongo {
namespace repl {
namespace {
const auto tenantIdToDeleteDecoration =
OperationContext::declareDecoration<boost::optional<std::string>>();
/**
* Initializes the TenantMigrationRecipientAccessBlocker for the tenant migration denoted by the
* given state doc.
*/
void createAccessBlockerIfNeeded(OperationContext* opCtx,
const TenantMigrationRecipientDocument& recipientStateDoc) {
if (tenant_migration_access_blocker::getTenantMigrationRecipientAccessBlocker(
opCtx->getServiceContext(), recipientStateDoc.getTenantId())) {
// The migration failed part-way on the recipient with a retryable error, and got retried
// internally.
return;
}
auto mtab = std::make_shared<TenantMigrationRecipientAccessBlocker>(
opCtx->getServiceContext(),
recipientStateDoc.getId(),
recipientStateDoc.getTenantId().toString(),
recipientStateDoc.getDonorConnectionString().toString());
TenantMigrationAccessBlockerRegistry::get(opCtx->getServiceContext())
.add(recipientStateDoc.getTenantId(), mtab);
}
/**
* Transitions the TenantMigrationRecipientAccessBlocker to the rejectBefore state.
*/
void onSetRejectReadsBeforeTimestamp(OperationContext* opCtx,
const TenantMigrationRecipientDocument& recipientStateDoc) {
invariant(recipientStateDoc.getState() == TenantMigrationRecipientStateEnum::kConsistent);
invariant(recipientStateDoc.getRejectReadsBeforeTimestamp());
auto mtab = tenant_migration_access_blocker::getTenantMigrationRecipientAccessBlocker(
opCtx->getServiceContext(), recipientStateDoc.getTenantId());
invariant(mtab);
mtab->startRejectingReadsBefore(recipientStateDoc.getRejectReadsBeforeTimestamp().get());
}
} // namespace
void TenantMigrationRecipientOpObserver::onUpdate(OperationContext* opCtx,
const OplogUpdateEntryArgs& args) {
if (args.nss == NamespaceString::kTenantMigrationRecipientsNamespace &&
!tenant_migration_access_blocker::inRecoveryMode(opCtx)) {
auto recipientStateDoc = TenantMigrationRecipientDocument::parse(
IDLParserErrorContext("recipientStateDoc"), args.updateArgs->updatedDoc);
opCtx->recoveryUnit()->onCommit([opCtx, recipientStateDoc](boost::optional<Timestamp>) {
auto mtab = tenant_migration_access_blocker::getTenantMigrationRecipientAccessBlocker(
opCtx->getServiceContext(), recipientStateDoc.getTenantId());
if (recipientStateDoc.getExpireAt() && mtab) {
if (mtab->inStateReject()) {
// The TenantMigrationRecipientAccessBlocker entry needs to be removed to
// re-allow reads and future migrations with the same tenantId as this migration
// has already been aborted and forgotten.
TenantMigrationAccessBlockerRegistry::get(opCtx->getServiceContext())
.remove(recipientStateDoc.getTenantId(),
TenantMigrationAccessBlocker::BlockerType::kRecipient);
return;
}
// Once the state doc is marked garbage collectable the TTL deletions should be
// unblocked.
mtab->stopBlockingTTL();
}
switch (recipientStateDoc.getState()) {
case TenantMigrationRecipientStateEnum::kUninitialized:
case TenantMigrationRecipientStateEnum::kDone:
break;
case TenantMigrationRecipientStateEnum::kStarted:
createAccessBlockerIfNeeded(opCtx, recipientStateDoc);
break;
case TenantMigrationRecipientStateEnum::kConsistent:
if (recipientStateDoc.getRejectReadsBeforeTimestamp()) {
onSetRejectReadsBeforeTimestamp(opCtx, recipientStateDoc);
}
break;
}
});
}
}
void TenantMigrationRecipientOpObserver::aboutToDelete(OperationContext* opCtx,
NamespaceString const& nss,
const UUID& uuid,
BSONObj const& doc) {
if (nss == NamespaceString::kTenantMigrationRecipientsNamespace &&
!tenant_migration_access_blocker::inRecoveryMode(opCtx)) {
auto recipientStateDoc = TenantMigrationRecipientDocument::parse(
IDLParserErrorContext("recipientStateDoc"), doc);
uassert(ErrorCodes::IllegalOperation,
str::stream() << "cannot delete a recipient's state document " << doc
<< " since it has not been marked as garbage collectable",
recipientStateDoc.getExpireAt());
// TenantMigrationRecipientAccessBlocker is created only after cloning finishes so it
// would not exist if the state doc is deleted prior to that (e.g. in the case where
// recipientForgetMigration is received before recipientSyncData).
auto mtab = tenant_migration_access_blocker::getTenantMigrationRecipientAccessBlocker(
opCtx->getServiceContext(), recipientStateDoc.getTenantId());
tenantIdToDeleteDecoration(opCtx) =
mtab ? boost::make_optional(recipientStateDoc.getTenantId().toString()) : boost::none;
}
}
void TenantMigrationRecipientOpObserver::onDelete(OperationContext* opCtx,
const NamespaceString& nss,
const UUID& uuid,
StmtId stmtId,
const OplogDeleteEntryArgs& args) {
if (nss == NamespaceString::kTenantMigrationRecipientsNamespace &&
tenantIdToDeleteDecoration(opCtx) &&
!tenant_migration_access_blocker::inRecoveryMode(opCtx)) {
opCtx->recoveryUnit()->onCommit([opCtx](boost::optional<Timestamp>) {
TenantMigrationAccessBlockerRegistry::get(opCtx->getServiceContext())
.remove(tenantIdToDeleteDecoration(opCtx).get(),
TenantMigrationAccessBlocker::BlockerType::kRecipient);
});
}
}
repl::OpTime TenantMigrationRecipientOpObserver::onDropCollection(
OperationContext* opCtx,
const NamespaceString& collectionName,
const UUID& uuid,
std::uint64_t numRecords,
const CollectionDropType dropType) {
if (collectionName == NamespaceString::kTenantMigrationRecipientsNamespace) {
opCtx->recoveryUnit()->onCommit([opCtx](boost::optional<Timestamp>) {
TenantMigrationAccessBlockerRegistry::get(opCtx->getServiceContext())
.removeAll(TenantMigrationAccessBlocker::BlockerType::kRecipient);
});
}
return {};
}
} // namespace repl
} // namespace mongo
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