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/**
* Copyright (C) 2018-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/namespace_string.h"
#include <ostream>
#include "mongo/base/parse_number.h"
#include "mongo/db/server_options.h"
#include "mongo/util/str.h"
namespace mongo {
namespace {
constexpr auto listCollectionsCursorCol = "$cmd.listCollections"_sd;
constexpr auto collectionlessAggregateCursorCol = "$cmd.aggregate"_sd;
constexpr auto dropPendingNSPrefix = "system.drop."_sd;
} // namespace
constexpr StringData NamespaceString::kAdminDb;
constexpr StringData NamespaceString::kLocalDb;
constexpr StringData NamespaceString::kConfigDb;
constexpr StringData NamespaceString::kSystemDotViewsCollectionName;
constexpr StringData NamespaceString::kOrphanCollectionPrefix;
constexpr StringData NamespaceString::kOrphanCollectionDb;
const NamespaceString NamespaceString::kServerConfigurationNamespace(NamespaceString::kAdminDb,
"system.version");
const NamespaceString NamespaceString::kLogicalSessionsNamespace(NamespaceString::kConfigDb,
"system.sessions");
// Persisted state for a shard participating in a transaction or retryable write.
const NamespaceString NamespaceString::kSessionTransactionsTableNamespace(
NamespaceString::kConfigDb, "transactions");
// Persisted state for a shard coordinating a cross-shard transaction.
const NamespaceString NamespaceString::kTransactionCoordinatorsNamespace(
NamespaceString::kConfigDb, "transaction_coordinators");
const NamespaceString NamespaceString::kMigrationCoordinatorsNamespace(NamespaceString::kConfigDb,
"migrationCoordinators");
const NamespaceString NamespaceString::kTenantMigrationDonorsNamespace(NamespaceString::kConfigDb,
"tenantMigrationDonors");
const NamespaceString NamespaceString::kTenantMigrationRecipientsNamespace(
NamespaceString::kConfigDb, "tenantMigrationRecipients");
const NamespaceString NamespaceString::kTenantMigrationOplogView(
NamespaceString::kLocalDb, "system.tenantMigration.oplogView");
const NamespaceString NamespaceString::kShardConfigCollectionsNamespace(NamespaceString::kConfigDb,
"cache.collections");
const NamespaceString NamespaceString::kShardConfigDatabasesNamespace(NamespaceString::kConfigDb,
"cache.databases");
const NamespaceString NamespaceString::kKeysCollectionNamespace(NamespaceString::kAdminDb,
"system.keys");
const NamespaceString NamespaceString::kExternalKeysCollectionNamespace(NamespaceString::kConfigDb,
"external_validation_keys");
const NamespaceString NamespaceString::kRsOplogNamespace(NamespaceString::kLocalDb, "oplog.rs");
const NamespaceString NamespaceString::kSystemReplSetNamespace(NamespaceString::kLocalDb,
"system.replset");
const NamespaceString NamespaceString::kIndexBuildEntryNamespace(NamespaceString::kConfigDb,
"system.indexBuilds");
const NamespaceString NamespaceString::kRangeDeletionNamespace(NamespaceString::kConfigDb,
"rangeDeletions");
const NamespaceString NamespaceString::kRangeDeletionForRenameNamespace(NamespaceString::kConfigDb,
"rangeDeletionsForRename");
const NamespaceString NamespaceString::kConfigReshardingOperationsNamespace(
NamespaceString::kConfigDb, "reshardingOperations");
const NamespaceString NamespaceString::kDonorReshardingOperationsNamespace(
NamespaceString::kConfigDb, "localReshardingOperations.donor");
const NamespaceString NamespaceString::kRecipientReshardingOperationsNamespace(
NamespaceString::kConfigDb, "localReshardingOperations.recipient");
const NamespaceString NamespaceString::kShardingDDLCoordinatorsNamespace(
NamespaceString::kConfigDb, "system.sharding_ddl_coordinators");
const NamespaceString NamespaceString::kShardingRenameParticipantsNamespace(
NamespaceString::kConfigDb, "localRenameParticipants");
const NamespaceString NamespaceString::kConfigSettingsNamespace(NamespaceString::kConfigDb,
"settings");
const NamespaceString NamespaceString::kVectorClockNamespace(NamespaceString::kConfigDb,
"vectorClock");
const NamespaceString NamespaceString::kReshardingApplierProgressNamespace(
NamespaceString::kConfigDb, "localReshardingOperations.recipient.progress_applier");
const NamespaceString NamespaceString::kReshardingTxnClonerProgressNamespace(
NamespaceString::kConfigDb, "localReshardingOperations.recipient.progress_txn_cloner");
const NamespaceString NamespaceString::kCollectionCriticalSectionsNamespace(
NamespaceString::kConfigDb, "collection_critical_sections");
const NamespaceString NamespaceString::kForceOplogBatchBoundaryNamespace(
NamespaceString::kConfigDb, "system.forceOplogBatchBoundary");
bool NamespaceString::isListCollectionsCursorNS() const {
return coll() == listCollectionsCursorCol;
}
bool NamespaceString::isCollectionlessAggregateNS() const {
return coll() == collectionlessAggregateCursorCol;
}
bool NamespaceString::isLegalClientSystemNS(
const ServerGlobalParams::FeatureCompatibility& currentFCV) const {
if (db() == kAdminDb) {
if (coll() == "system.roles")
return true;
if (coll() == kServerConfigurationNamespace.coll())
return true;
if (coll() == kKeysCollectionNamespace.coll())
return true;
if (coll() == "system.backup_users")
return true;
} else if (db() == kConfigDb) {
if (coll() == "system.sessions")
return true;
if (coll() == kIndexBuildEntryNamespace.coll())
return true;
if (coll().find(".system.resharding.") != std::string::npos)
return true;
if (coll() == kShardingDDLCoordinatorsNamespace.coll())
return true;
} else if (db() == kLocalDb) {
if (coll() == kSystemReplSetNamespace.coll())
return true;
if (coll() == "system.healthlog")
return true;
}
if (coll() == "system.users")
return true;
if (coll() == "system.js")
return true;
if (coll() == kSystemDotViewsCollectionName)
return true;
if (currentFCV.isGreaterThanOrEqualTo(
ServerGlobalParams::FeatureCompatibility::Version::kVersion47) &&
// While this FCV check is being added in 4.9, the namespace was allowed in 4.7 binaries
// without an FCV check.
isTemporaryReshardingCollection()) {
return true;
}
if (isTimeseriesBucketsCollection()) {
return true;
}
return false;
}
/**
* Oplog entries on 'system.views' should also be processed one at a time. View catalog immediately
* reflects changes for each oplog entry so we can see inconsistent view catalog if multiple oplog
* entries on 'system.views' are being applied out of the original order.
*
* Process updates to 'admin.system.version' individually as well so the secondary's FCV when
* processing each operation matches the primary's when committing that operation.
*/
bool NamespaceString::mustBeAppliedInOwnOplogBatch() const {
return isSystemDotViews() || isServerConfigurationCollection() || isPrivilegeCollection() ||
_ns == kDonorReshardingOperationsNamespace.ns() ||
_ns == kForceOplogBatchBoundaryNamespace.ns();
}
NamespaceString NamespaceString::makeListCollectionsNSS(StringData dbName) {
NamespaceString nss(dbName, listCollectionsCursorCol);
dassert(nss.isValid());
dassert(nss.isListCollectionsCursorNS());
return nss;
}
NamespaceString NamespaceString::makeCollectionlessAggregateNSS(StringData dbname) {
NamespaceString nss(dbname, collectionlessAggregateCursorCol);
dassert(nss.isValid());
dassert(nss.isCollectionlessAggregateNS());
return nss;
}
std::string NamespaceString::getSisterNS(StringData local) const {
verify(local.size() && local[0] != '.');
return db().toString() + "." + local.toString();
}
void NamespaceString::serializeCollectionName(BSONObjBuilder* builder, StringData fieldName) const {
if (isCollectionlessAggregateNS()) {
builder->append(fieldName, 1);
} else {
builder->append(fieldName, coll());
}
}
bool NamespaceString::isDropPendingNamespace() const {
return coll().startsWith(dropPendingNSPrefix);
}
NamespaceString NamespaceString::makeDropPendingNamespace(const repl::OpTime& opTime) const {
StringBuilder ss;
ss << db() << "." << dropPendingNSPrefix;
ss << opTime.getSecs() << "i" << opTime.getTimestamp().getInc() << "t" << opTime.getTerm();
ss << "." << coll();
return NamespaceString(ss.stringData());
}
StatusWith<repl::OpTime> NamespaceString::getDropPendingNamespaceOpTime() const {
if (!isDropPendingNamespace()) {
return Status(ErrorCodes::BadValue,
str::stream() << "Not a drop-pending namespace: " << _ns);
}
auto collectionName = coll();
auto opTimeBeginIndex = dropPendingNSPrefix.size();
auto opTimeEndIndex = collectionName.find('.', opTimeBeginIndex);
auto opTimeStr = std::string::npos == opTimeEndIndex
? collectionName.substr(opTimeBeginIndex)
: collectionName.substr(opTimeBeginIndex, opTimeEndIndex - opTimeBeginIndex);
auto incrementSeparatorIndex = opTimeStr.find('i');
if (std::string::npos == incrementSeparatorIndex) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Missing 'i' separator in drop-pending namespace: " << _ns);
}
auto termSeparatorIndex = opTimeStr.find('t', incrementSeparatorIndex);
if (std::string::npos == termSeparatorIndex) {
return Status(ErrorCodes::FailedToParse,
str::stream() << "Missing 't' separator in drop-pending namespace: " << _ns);
}
long long seconds;
auto status = NumberParser{}(opTimeStr.substr(0, incrementSeparatorIndex), &seconds);
if (!status.isOK()) {
return status.withContext(
str::stream() << "Invalid timestamp seconds in drop-pending namespace: " << _ns);
}
unsigned int increment;
status = NumberParser{}(opTimeStr.substr(incrementSeparatorIndex + 1,
termSeparatorIndex - (incrementSeparatorIndex + 1)),
&increment);
if (!status.isOK()) {
return status.withContext(
str::stream() << "Invalid timestamp increment in drop-pending namespace: " << _ns);
}
long long term;
status = mongo::NumberParser{}(opTimeStr.substr(termSeparatorIndex + 1), &term);
if (!status.isOK()) {
return status.withContext(str::stream()
<< "Invalid term in drop-pending namespace: " << _ns);
}
return repl::OpTime(Timestamp(Seconds(seconds), increment), term);
}
bool NamespaceString::isNamespaceAlwaysUnsharded() const {
// Local and admin never have sharded collections
if (db() == NamespaceString::kLocalDb || db() == NamespaceString::kAdminDb)
return true;
// Config can only have the system.sessions as sharded
if (db() == NamespaceString::kConfigDb)
return *this != NamespaceString::kLogicalSessionsNamespace;
if (isSystemDotProfile())
return true;
if (isSystemDotViews())
return true;
return false;
}
bool NamespaceString::isConfigDotCacheDotChunks() const {
return db() == "config" && coll().startsWith("cache.chunks.");
}
bool NamespaceString::isReshardingLocalOplogBufferCollection() const {
return db() == "config" && coll().startsWith(kReshardingLocalOplogBufferPrefix);
}
bool NamespaceString::isReshardingConflictStashCollection() const {
return db() == "config" && coll().startsWith(kReshardingConflictStashPrefix);
}
bool NamespaceString::isTemporaryReshardingCollection() const {
return coll().startsWith(kTemporaryReshardingCollectionPrefix);
}
bool NamespaceString::isTimeseriesBucketsCollection() const {
return coll().startsWith(kTimeseriesBucketsCollectionPrefix);
}
NamespaceString NamespaceString::makeTimeseriesBucketsNamespace() const {
return {db(), kTimeseriesBucketsCollectionPrefix.toString() + coll()};
}
NamespaceString NamespaceString::getTimeseriesViewNamespace() const {
invariant(isTimeseriesBucketsCollection());
return {db(), coll().substr(kTimeseriesBucketsCollectionPrefix.size())};
}
bool NamespaceString::isReplicated() const {
if (isLocal()) {
return false;
}
// Of collections not in the `local` database, only `system` collections might not be
// replicated.
if (!isSystem()) {
return true;
}
if (isSystemDotProfile()) {
return false;
}
// E.g: `system.version` is replicated.
return true;
}
std::string NamespaceStringOrUUID::toString() const {
if (_nss)
return _nss->toString();
else
return _uuid->toString();
}
void NamespaceStringOrUUID::serialize(BSONObjBuilder* builder, StringData fieldName) const {
invariant(_uuid || _nss);
if (_preferNssForSerialization) {
if (_nss) {
builder->append(fieldName, _nss->coll());
} else {
_uuid->appendToBuilder(builder, fieldName);
}
} else {
if (_uuid) {
_uuid->appendToBuilder(builder, fieldName);
} else {
builder->append(fieldName, _nss->coll());
}
}
}
std::ostream& operator<<(std::ostream& stream, const NamespaceString& nss) {
return stream << nss.toString();
}
std::ostream& operator<<(std::ostream& stream, const NamespaceStringOrUUID& nsOrUUID) {
return stream << nsOrUUID.toString();
}
StringBuilder& operator<<(StringBuilder& builder, const NamespaceString& nss) {
return builder << nss.toString();
}
StringBuilder& operator<<(StringBuilder& builder, const NamespaceStringOrUUID& nsOrUUID) {
return builder << nsOrUUID.toString();
}
} // namespace mongo
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