/**
* Copyright (C) 2017 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see .
*
* 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 GNU Affero General 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_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kStorage
#include "mongo/platform/basic.h"
#include "mongo/db/catalog/database_holder_impl.h"
#include "mongo/base/init.h"
#include "mongo/db/audit.h"
#include "mongo/db/background.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/catalog/database_catalog_entry.h"
#include "mongo/db/catalog/namespace_uuid_cache.h"
#include "mongo/db/catalog/uuid_catalog.h"
#include "mongo/db/client.h"
#include "mongo/db/clientcursor.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/oplog.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/util/log.h"
#include "mongo/util/scopeguard.h"
namespace mongo {
namespace {
const auto dbHolderStorage = ServiceContext::declareDecoration();
} // namespace
MONGO_REGISTER_SHIM(DatabaseHolder::getDatabaseHolder)
()->DatabaseHolder& {
return dbHolderStorage(getGlobalServiceContext());
}
MONGO_REGISTER_SHIM(DatabaseHolder::makeImpl)
(PrivateTo)->std::unique_ptr {
return std::make_unique();
}
using std::set;
using std::size_t;
using std::string;
using std::stringstream;
namespace {
StringData _todb(StringData ns) {
size_t i = ns.find('.');
if (i == std::string::npos) {
uassert(13074, "db name can't be empty", ns.size());
return ns;
}
uassert(13075, "db name can't be empty", i > 0);
const StringData d = ns.substr(0, i);
uassert(13280,
"invalid db name: " + ns.toString(),
NamespaceString::validDBName(d, NamespaceString::DollarInDbNameBehavior::Allow));
return d;
}
} // namespace
Database* DatabaseHolderImpl::get(OperationContext* opCtx, StringData ns) const {
const StringData db = _todb(ns);
invariant(opCtx->lockState()->isDbLockedForMode(db, MODE_IS));
stdx::lock_guard lk(_m);
DBs::const_iterator it = _dbs.find(db);
if (it != _dbs.end()) {
return it->second;
}
return NULL;
}
std::set DatabaseHolderImpl::_getNamesWithConflictingCasing_inlock(StringData name) {
std::set duplicates;
for (const auto& nameAndPointer : _dbs) {
// A name that's equal with case-insensitive match must be identical, or it's a duplicate.
if (name.equalCaseInsensitive(nameAndPointer.first) && name != nameAndPointer.first)
duplicates.insert(nameAndPointer.first);
}
return duplicates;
}
std::set DatabaseHolderImpl::getNamesWithConflictingCasing(StringData name) {
stdx::lock_guard lk(_m);
return _getNamesWithConflictingCasing_inlock(name);
}
Database* DatabaseHolderImpl::openDb(OperationContext* opCtx, StringData ns, bool* justCreated) {
const StringData dbname = _todb(ns);
invariant(opCtx->lockState()->isDbLockedForMode(dbname, MODE_X));
if (justCreated)
*justCreated = false; // Until proven otherwise.
stdx::unique_lock lk(_m);
// The following will insert a nullptr for dbname, which will treated the same as a non-
// existant database by the get method, yet still counts in getNamesWithConflictingCasing.
if (auto db = _dbs[dbname])
return db;
// We've inserted a nullptr entry for dbname: make sure to remove it on unsuccessful exit.
auto removeDbGuard = MakeGuard([this, &lk, dbname] {
if (!lk.owns_lock())
lk.lock();
_dbs.erase(dbname);
});
// Check casing in lock to avoid transient duplicates.
auto duplicates = _getNamesWithConflictingCasing_inlock(dbname);
uassert(ErrorCodes::DatabaseDifferCase,
str::stream() << "db already exists with different case already have: ["
<< *duplicates.cbegin()
<< "] trying to create ["
<< dbname.toString()
<< "]",
duplicates.empty());
// Do the catalog lookup and database creation outside of the scoped lock, because these may
// block. Only one thread can be inside this method for the same DB name, because of the
// requirement for X-lock on the database when we enter. So there is no way we can insert two
// different databases for the same name.
lk.unlock();
StorageEngine* storageEngine = getGlobalServiceContext()->getStorageEngine();
DatabaseCatalogEntry* entry = storageEngine->getDatabaseCatalogEntry(opCtx, dbname);
if (!entry->exists()) {
audit::logCreateDatabase(&cc(), dbname);
if (justCreated)
*justCreated = true;
}
auto newDb = stdx::make_unique(opCtx, dbname, entry);
// Finally replace our nullptr entry with the new Database pointer.
removeDbGuard.Dismiss();
lk.lock();
auto it = _dbs.find(dbname);
invariant(it != _dbs.end() && it->second == nullptr);
it->second = newDb.release();
invariant(_getNamesWithConflictingCasing_inlock(dbname.toString()).empty());
return it->second;
}
namespace {
void evictDatabaseFromUUIDCatalog(OperationContext* opCtx, Database* db) {
UUIDCatalog::get(opCtx).onCloseDatabase(db);
for (auto&& coll : *db) {
NamespaceUUIDCache::get(opCtx).evictNamespace(coll->ns());
}
}
} // namespace
void DatabaseHolderImpl::close(OperationContext* opCtx, StringData ns, const std::string& reason) {
invariant(opCtx->lockState()->isW());
const StringData dbName = _todb(ns);
stdx::lock_guard lk(_m);
DBs::const_iterator it = _dbs.find(dbName);
if (it == _dbs.end()) {
return;
}
auto db = it->second;
repl::oplogCheckCloseDatabase(opCtx, db);
evictDatabaseFromUUIDCatalog(opCtx, db);
db->close(opCtx, reason);
delete db;
db = nullptr;
_dbs.erase(it);
getGlobalServiceContext()
->getStorageEngine()
->closeDatabase(opCtx, dbName.toString())
.transitional_ignore();
}
void DatabaseHolderImpl::closeAll(OperationContext* opCtx, const std::string& reason) {
invariant(opCtx->lockState()->isW());
stdx::lock_guard lk(_m);
set dbs;
for (DBs::const_iterator i = _dbs.begin(); i != _dbs.end(); ++i) {
BackgroundOperation::assertNoBgOpInProgForDb(i->first);
dbs.insert(i->first);
}
for (set::iterator i = dbs.begin(); i != dbs.end(); ++i) {
string name = *i;
LOG(2) << "DatabaseHolder::closeAll name:" << name;
Database* db = _dbs[name];
repl::oplogCheckCloseDatabase(opCtx, db);
evictDatabaseFromUUIDCatalog(opCtx, db);
db->close(opCtx, reason);
delete db;
_dbs.erase(name);
getGlobalServiceContext()
->getStorageEngine()
->closeDatabase(opCtx, name)
.transitional_ignore();
}
}
} // namespace mongo