Hawkin
/
arangodb
mirror of https://gitee.com/bigwinds/arangodb
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
arangodb/arangod/VocBase/vocbase.cpp

2043 lines
65 KiB
C++
Raw Permalink Blame History

////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
///
/// Licensed under the Apache License, Version 2.0 (the "License");
/// you may not use this file except in compliance with the License.
/// You may obtain a copy of the License at
///
/// http://www.apache.org/licenses/LICENSE-2.0
///
/// Unless required by applicable law or agreed to in writing, software
/// distributed under the License is distributed on an "AS IS" BASIS,
/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/// See the License for the specific language governing permissions and
/// limitations under the License.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Dr. Frank Celler
////////////////////////////////////////////////////////////////////////////////
#include "vocbase.h"
#include <velocypack/Builder.h>
#include <velocypack/Collection.h>
#include <velocypack/Parser.h>
#include <velocypack/velocypack-aliases.h>
#include "ApplicationFeatures/ApplicationServer.h"
#include "Aql/PlanCache.h"
#include "Aql/QueryCache.h"
#include "Aql/QueryList.h"
#include "Basics/Exceptions.h"
#include "Basics/FileUtils.h"
#include "Basics/HybridLogicalClock.h"
#include "Basics/NumberUtils.h"
#include "Basics/ReadLocker.h"
#include "Basics/RecursiveLocker.h"
#include "Basics/StaticStrings.h"
#include "Basics/StringUtils.h"
#include "Basics/VelocyPackHelper.h"
#include "Basics/WriteLocker.h"
#include "Basics/conversions.h"
#include "Basics/files.h"
#include "Basics/memory-map.h"
#include "Basics/threads.h"
#include "Basics/tri-strings.h"
#include "Cluster/ClusterInfo.h"
#include "Cluster/ServerState.h"
#include "Logger/Logger.h"
#include "Replication/DatabaseReplicationApplier.h"
#include "Replication/utilities.h"
#include "RestServer/DatabaseFeature.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "StorageEngine/PhysicalCollection.h"
#include "StorageEngine/StorageEngine.h"
#include "Utils/CollectionKeysRepository.h"
#include "Utils/CursorRepository.h"
#include "Utils/Events.h"
#include "Utils/ExecContext.h"
#include "Utils/VersionTracker.h"
#include "V8Server/v8-user-structures.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/LogicalView.h"
#include "VocBase/ticks.h"
#include <thread>
using namespace arangodb;
using namespace arangodb::basics;
/// @brief increase the reference counter for a database
bool TRI_vocbase_t::use() {
auto expected = _refCount.load(std::memory_order_relaxed);
while (true) {
if ((expected & 1) != 0) {
// deleted bit is set
return false;
}
// increase the reference counter by 2.
// this is because we use odd values to indicate that the database has been
// marked as deleted
auto updated = expected + 2;
TRI_ASSERT((updated & 1) == 0);
if (_refCount.compare_exchange_weak(expected, updated, std::memory_order_release,
std::memory_order_relaxed)) {
// compare-exchange worked. we're done
return true;
}
// compare-exchange failed. try again!
expected = _refCount.load(std::memory_order_relaxed);
}
}
void TRI_vocbase_t::forceUse() { _refCount += 2; }
/// @brief decrease the reference counter for a database
void TRI_vocbase_t::release() noexcept {
// decrease the reference counter by 2.
// this is because we use odd values to indicate that the database has been
// marked as deleted
auto oldValue = _refCount.fetch_sub(2);
TRI_ASSERT(oldValue >= 2);
}
/// @brief returns whether the database can be dropped
bool TRI_vocbase_t::isDangling() const {
if (isSystem()) {
return false;
}
auto refCount = _refCount.load();
// we are intentionally comparing with exactly 1 here, because a 1 means
// that noone else references the database but it has been marked as deleted
return (refCount == 1);
}
/// @brief whether or not the vocbase has been marked as deleted
bool TRI_vocbase_t::isDropped() const {
auto refCount = _refCount.load();
// if the stored value is odd, it means the database has been marked as
// deleted
return (refCount % 2 == 1);
}
/// @brief marks a database as deleted
bool TRI_vocbase_t::markAsDropped() {
TRI_ASSERT(!isSystem());
auto oldValue = _refCount.fetch_or(1);
// if the previously stored value is odd, it means the database has already
// been marked as deleted
return (oldValue % 2 == 0);
}
/// @brief signal the cleanup thread to wake up
void TRI_vocbase_t::signalCleanup() {
StorageEngine* engine = EngineSelectorFeature::ENGINE;
engine->signalCleanup(*this);
}
void TRI_vocbase_t::checkCollectionInvariants() const {
TRI_ASSERT(_dataSourceByName.size() == _dataSourceById.size());
TRI_ASSERT(_dataSourceByUuid.size() == _dataSourceById.size());
}
/// @brief adds a new collection
/// caller must hold _dataSourceLock in write mode or set doLock
void TRI_vocbase_t::registerCollection(bool doLock,
std::shared_ptr<arangodb::LogicalCollection> const& collection) {
std::string name = collection->name();
TRI_voc_cid_t cid = collection->id();
{
RECURSIVE_WRITE_LOCKER_NAMED(writeLocker, _dataSourceLock,
_dataSourceLockWriteOwner, doLock);
checkCollectionInvariants();
TRI_DEFER(checkCollectionInvariants());
// check name
auto it = _dataSourceByName.emplace(name, collection);
if (!it.second) {
std::string msg;
msg.append(std::string("duplicate entry for collection name '") + name +
"'. collection id " + std::to_string(cid) +
" has same name as already added collection " +
std::to_string(_dataSourceByName[name]->id()));
LOG_TOPIC("405f9", ERR, arangodb::Logger::FIXME) << msg;
THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_ARANGO_DUPLICATE_NAME, msg);
}
// check collection identifier
try {
auto it2 = _dataSourceById.emplace(cid, collection);
if (!it2.second) {
std::string msg;
msg.append(std::string("duplicate collection identifier ") +
std::to_string(collection->id()) + " for name '" + name +
"'");
LOG_TOPIC("0ef12", ERR, arangodb::Logger::FIXME) << msg;
THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_ARANGO_DUPLICATE_IDENTIFIER, msg);
}
} catch (...) {
_dataSourceByName.erase(name);
throw;
}
try {
auto it2 = _dataSourceByUuid.emplace(collection->guid(), collection);
if (!it2.second) {
std::string msg;
msg.append(std::string("duplicate entry for collection uuid '") +
collection->guid() + "'");
LOG_TOPIC("d4958", ERR, arangodb::Logger::FIXME) << msg;
THROW_ARANGO_EXCEPTION_MESSAGE(TRI_ERROR_ARANGO_DUPLICATE_IDENTIFIER, msg);
}
} catch (...) {
_dataSourceByName.erase(name);
_dataSourceById.erase(cid);
throw;
}
try {
_collections.emplace_back(collection);
} catch (...) {
_dataSourceByName.erase(name);
_dataSourceById.erase(cid);
_dataSourceByUuid.erase(collection->guid());
throw;
}
collection->setStatus(TRI_VOC_COL_STATUS_UNLOADED);
}
}
/// @brief removes a collection name from the global list of collections
/// This function is called when a collection is dropped.
/// NOTE: You need a writelock on _dataSourceLock
bool TRI_vocbase_t::unregisterCollection(arangodb::LogicalCollection* collection) {
TRI_ASSERT(collection != nullptr);
// pre-condition
checkCollectionInvariants();
auto itr = _dataSourceById.find(collection->id());
if (itr == _dataSourceById.end() ||
itr->second->category() != LogicalCollection::category()) {
return true; // no such collection
}
TRI_ASSERT(std::dynamic_pointer_cast<arangodb::LogicalCollection>(itr->second));
// only if we find the collection by its id, we can delete it by name
_dataSourceById.erase(itr);
// this is because someone else might have created a new collection with the
// same name, but with a different id
_dataSourceByName.erase(collection->name());
_dataSourceByUuid.erase(collection->guid());
// post-condition
checkCollectionInvariants();
return true;
}
/// @brief adds a new view
/// caller must hold _viewLock in write mode or set doLock
void TRI_vocbase_t::registerView(bool doLock,
std::shared_ptr<arangodb::LogicalView> const& view) {
TRI_ASSERT(false == !view);
auto& name = view->name();
auto id = view->id();
{
RECURSIVE_WRITE_LOCKER_NAMED(writeLocker, _dataSourceLock,
_dataSourceLockWriteOwner, doLock);
// check name
auto it = _dataSourceByName.emplace(name, view);
if (!it.second) {
LOG_TOPIC("560a6", ERR, arangodb::Logger::FIXME)
<< "duplicate entry for view name '" << name << "'";
LOG_TOPIC("0168f", ERR, arangodb::Logger::FIXME)
<< "view id " << id << " has same name as already added view "
<< _dataSourceByName[name]->id();
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_DUPLICATE_NAME);
}
// check id
try {
auto it2 = _dataSourceById.emplace(id, view);
if (!it2.second) {
_dataSourceByName.erase(name);
LOG_TOPIC("cb53a", ERR, arangodb::Logger::FIXME)
<< "duplicate view identifier '" << view->id() << "' for name '"
<< name << "'";
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_DUPLICATE_IDENTIFIER);
}
} catch (...) {
_dataSourceByName.erase(name);
throw;
}
try {
auto it2 = _dataSourceByUuid.emplace(view->guid(), view);
if (!it2.second) {
LOG_TOPIC("a30ae", ERR, arangodb::Logger::FIXME)
<< "duplicate view globally-unique identifier '" << view->guid()
<< "' for name '" << name << "'";
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_DUPLICATE_IDENTIFIER);
}
} catch (...) {
_dataSourceByName.erase(name);
_dataSourceById.erase(id);
throw;
}
checkCollectionInvariants();
}
}
/// @brief removes a views name from the global list of views
/// This function is called when a view is dropped.
/// NOTE: You need a writelock on _dataSourceLock
bool TRI_vocbase_t::unregisterView(arangodb::LogicalView const& view) {
// pre-condition
checkCollectionInvariants();
auto itr = _dataSourceById.find(view.id());
if (itr == _dataSourceById.end() || itr->second->category() != LogicalView::category()) {
return true; // no such view
}
TRI_ASSERT(std::dynamic_pointer_cast<arangodb::LogicalView>(itr->second));
// only if we find the collection by its id, we can delete it by name
_dataSourceById.erase(itr);
// this is because someone else might have created a new view with the
// same name, but with a different id
_dataSourceByName.erase(view.name());
_dataSourceByUuid.erase(view.guid());
// post-condition
checkCollectionInvariants();
return true;
}
/// @brief drops a collection
/*static */ bool TRI_vocbase_t::DropCollectionCallback(arangodb::LogicalCollection& collection) {
{
WRITE_LOCKER_EVENTUAL(statusLock, collection._lock);
if (TRI_VOC_COL_STATUS_DELETED != collection.status()) {
LOG_TOPIC("57377", ERR, arangodb::Logger::FIXME)
<< "someone resurrected the collection '" << collection.name() << "'";
return false;
}
} // release status lock
// remove from list of collections
auto& vocbase = collection.vocbase();
{
RECURSIVE_WRITE_LOCKER(vocbase._dataSourceLock, vocbase._dataSourceLockWriteOwner);
auto it = vocbase._collections.begin();
for (auto end = vocbase._collections.end(); it != end; ++it) {
if (it->get() == &collection) {
break;
}
}
if (it != vocbase._collections.end()) {
auto col = *it;
vocbase._collections.erase(it);
// we need to clean up the pointers later so we insert it into this vector
try {
vocbase._deadCollections.emplace_back(col);
} catch (...) {
}
}
}
collection.drop();
return true;
}
/// @brief creates a new collection, worker function
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::createCollectionWorker(VPackSlice parameters) {
std::string name =
arangodb::basics::VelocyPackHelper::getStringValue(parameters, "name", "");
TRI_ASSERT(!name.empty());
// Try to create a new collection. This is not registered yet
auto collection =
std::make_shared<arangodb::LogicalCollection>(*this, parameters, false);
TRI_ASSERT(collection != nullptr);
RECURSIVE_WRITE_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
// reserve room for the new collection
_collections.reserve(_collections.size() + 1);
_deadCollections.reserve(_deadCollections.size() + 1);
auto it = _dataSourceByName.find(name);
if (it != _dataSourceByName.end()) {
events::CreateCollection(this->name(), name, TRI_ERROR_ARANGO_DUPLICATE_NAME);
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_DUPLICATE_NAME);
}
registerCollection(basics::ConditionalLocking::DoNotLock, collection);
try {
collection->setStatus(TRI_VOC_COL_STATUS_LOADED);
// set collection version to 3.1, as the collection is just created
collection->setVersion(LogicalCollection::VERSION_33);
// Let's try to persist it.
collection->persistPhysicalCollection();
events::CreateCollection(this->name(), name, TRI_ERROR_NO_ERROR);
return collection;
} catch (...) {
unregisterCollection(collection.get());
throw;
}
}
/// @brief loads an existing collection
/// Note that this will READ lock the collection. You have to release the
/// collection lock by yourself.
int TRI_vocbase_t::loadCollection(arangodb::LogicalCollection* collection,
TRI_vocbase_col_status_e& status, bool setStatus) {
TRI_ASSERT(collection->id() != 0);
// read lock
// check if the collection is already loaded
{
ExecContext const* exec = ExecContext::CURRENT;
if (exec != nullptr &&
!exec->canUseCollection(_name, collection->name(), auth::Level::RO)) {
return TRI_set_errno(TRI_ERROR_FORBIDDEN);
}
READ_LOCKER_EVENTUAL(locker, collection->_lock);
// return original status to the caller
if (setStatus) {
status = collection->status();
}
if (collection->status() == TRI_VOC_COL_STATUS_LOADED) {
// DO NOT release the lock
locker.steal();
return TRI_ERROR_NO_ERROR;
}
if (collection->status() == TRI_VOC_COL_STATUS_DELETED) {
return TRI_set_errno(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
if (collection->status() == TRI_VOC_COL_STATUS_CORRUPTED) {
return TRI_set_errno(TRI_ERROR_ARANGO_CORRUPTED_COLLECTION);
}
}
// release the read lock and acquire a write lock, we have to do some work
// .............................................................................
// write lock
// .............................................................................
WRITE_LOCKER_EVENTUAL(locker, collection->_lock);
// someone else loaded the collection, release the WRITE lock and try again
if (collection->status() == TRI_VOC_COL_STATUS_LOADED) {
locker.unlock();
return loadCollection(collection, status, false);
}
// someone is trying to unload the collection, cancel this,
// release the WRITE lock and try again
if (collection->status() == TRI_VOC_COL_STATUS_UNLOADING) {
// check if the collection is dropped
if (collection->deleted()) {
// drop call going on, we must abort
locker.unlock();
// someone requested the collection to be dropped, so it's not there
// anymore
return TRI_set_errno(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
// no drop action found, go on
collection->setStatus(TRI_VOC_COL_STATUS_LOADED);
locker.unlock();
return loadCollection(collection, status, false);
}
// deleted, give up
if (collection->status() == TRI_VOC_COL_STATUS_DELETED) {
return TRI_set_errno(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
}
// corrupted, give up
if (collection->status() == TRI_VOC_COL_STATUS_CORRUPTED) {
return TRI_set_errno(TRI_ERROR_ARANGO_CORRUPTED_COLLECTION);
}
// currently loading
if (collection->status() == TRI_VOC_COL_STATUS_LOADING) {
locker.unlock();
// loop until the status changes
while (true) {
TRI_vocbase_col_status_e status;
{
READ_LOCKER_EVENTUAL(readLocker, collection->_lock);
status = collection->status();
}
if (status != TRI_VOC_COL_STATUS_LOADING) {
break;
}
// only throw this particular error if the server is configured to do so
auto databaseFeature =
application_features::ApplicationServer::getFeature<DatabaseFeature>(
"Database");
if (databaseFeature->throwCollectionNotLoadedError()) {
return TRI_ERROR_ARANGO_COLLECTION_NOT_LOADED;
}
std::this_thread::sleep_for(std::chrono::microseconds(collectionStatusPollInterval()));
}
return loadCollection(collection, status, false);
}
// unloaded, load collection
if (collection->status() == TRI_VOC_COL_STATUS_UNLOADED) {
// set the status to loading
collection->setStatus(TRI_VOC_COL_STATUS_LOADING);
// release the lock on the collection temporarily
// this will allow other threads to check the collection's
// status while it is loading (loading may take a long time because of
// disk activity, index creation etc.)
locker.unlock();
bool ignoreDatafileErrors = false;
if (DatabaseFeature::DATABASE != nullptr) {
ignoreDatafileErrors = DatabaseFeature::DATABASE->ignoreDatafileErrors();
}
try {
collection->open(ignoreDatafileErrors);
} catch (arangodb::basics::Exception const& ex) {
LOG_TOPIC("b092e", ERR, arangodb::Logger::FIXME)
<< "caught exception while opening collection '" << collection->name()
<< "': " << ex.what();
collection->setStatus(TRI_VOC_COL_STATUS_CORRUPTED);
return TRI_ERROR_ARANGO_CORRUPTED_COLLECTION;
} catch (std::exception const& ex) {
LOG_TOPIC("0daf1", ERR, arangodb::Logger::FIXME)
<< "caught exception while opening collection '" << collection->name()
<< "': " << ex.what();
collection->setStatus(TRI_VOC_COL_STATUS_CORRUPTED);
return TRI_ERROR_ARANGO_CORRUPTED_COLLECTION;
} catch (...) {
LOG_TOPIC("4711a", ERR, arangodb::Logger::FIXME)
<< "caught unknown exception while opening collection '"
<< collection->name() << "'";
collection->setStatus(TRI_VOC_COL_STATUS_CORRUPTED);
return TRI_ERROR_ARANGO_CORRUPTED_COLLECTION;
}
// lock again to adjust the status
locker.lockEventual();
// no one else must have changed the status
TRI_ASSERT(collection->status() == TRI_VOC_COL_STATUS_LOADING);
collection->setStatus(TRI_VOC_COL_STATUS_LOADED);
collection->load();
// release the WRITE lock and try again
locker.unlock();
return loadCollection(collection, status, false);
}
std::string const colName(collection->name());
LOG_TOPIC("56df6", ERR, arangodb::Logger::FIXME)
<< "unknown collection status " << collection->status() << " for '"
<< colName << "'";
return TRI_set_errno(TRI_ERROR_INTERNAL);
}
/// @brief drops a collection, worker function
int TRI_vocbase_t::dropCollectionWorker(arangodb::LogicalCollection* collection,
DropState& state, double timeout) {
state = DROP_EXIT;
std::string const colName(collection->name());
double startTime = TRI_microtime();
// do not acquire these locks instantly
RECURSIVE_WRITE_LOCKER_NAMED(writeLocker, _dataSourceLock, _dataSourceLockWriteOwner,
basics::ConditionalLocking::DoNotLock);
CONDITIONAL_WRITE_LOCKER(locker, collection->_lock, basics::ConditionalLocking::DoNotLock);
while (true) {
TRI_ASSERT(!writeLocker.isLocked());
TRI_ASSERT(!locker.isLocked());
// block until we have acquired this lock
writeLocker.lock();
// we now have the one lock
TRI_ASSERT(writeLocker.isLocked());
if (locker.tryLock()) {
// we now have both locks and can continue outside of this loop
break;
}
// unlock the write locker so we don't block other operations
writeLocker.unlock();
TRI_ASSERT(!writeLocker.isLocked());
TRI_ASSERT(!locker.isLocked());
if (timeout >= 0.0 && TRI_microtime() > startTime + timeout) {
events::DropCollection(name(), colName, TRI_ERROR_LOCK_TIMEOUT);
return TRI_ERROR_LOCK_TIMEOUT;
}
// sleep for a while
std::this_thread::yield();
std::this_thread::sleep_for(std::chrono::microseconds(10000));
}
TRI_ASSERT(writeLocker.isLocked());
TRI_ASSERT(locker.isLocked());
#if USE_PLAN_CACHE
arangodb::aql::PlanCache::instance()->invalidate(this);
#endif
arangodb::aql::QueryCache::instance()->invalidate(this);
switch (collection->status()) {
case TRI_VOC_COL_STATUS_DELETED: {
// collection already deleted
// mark collection as deleted
unregisterCollection(collection);
break;
}
case TRI_VOC_COL_STATUS_LOADING: {
// collection is loading
// loop until status changes
// try again later
state = DROP_AGAIN;
break;
}
case TRI_VOC_COL_STATUS_UNLOADED: {
// collection is unloaded
StorageEngine* engine = EngineSelectorFeature::ENGINE;
bool doSync = !engine->inRecovery() &&
application_features::ApplicationServer::getFeature<DatabaseFeature>(
"Database")
->forceSyncProperties();
if (!collection->deleted()) {
collection->deleted(true);
try {
engine->changeCollection(*this, *collection, doSync);
} catch (arangodb::basics::Exception const& ex) {
collection->deleted(false);
events::DropCollection(name(), colName, ex.code());
return ex.code();
} catch (std::exception const&) {
collection->deleted(false);
events::DropCollection(name(), colName, TRI_ERROR_INTERNAL);
return TRI_ERROR_INTERNAL;
}
}
collection->setStatus(TRI_VOC_COL_STATUS_DELETED);
unregisterCollection(collection);
locker.unlock();
writeLocker.unlock();
TRI_ASSERT(engine != nullptr);
engine->dropCollection(*this, *collection);
DropCollectionCallback(*collection);
break;
}
case TRI_VOC_COL_STATUS_LOADED:
case TRI_VOC_COL_STATUS_UNLOADING: {
// collection is loaded
collection->deleted(true);
StorageEngine* engine = EngineSelectorFeature::ENGINE;
VPackBuilder builder;
engine->getCollectionInfo(*this, collection->id(), builder, false, 0);
auto res = collection->properties(builder.slice().get("parameters"),
false); // always a full-update
if (!res.ok()) {
events::DropCollection(name(), colName, res.errorNumber());
return res.errorNumber();
}
collection->setStatus(TRI_VOC_COL_STATUS_DELETED);
unregisterCollection(collection);
locker.unlock();
writeLocker.unlock();
engine->dropCollection(*this, *collection);
state = DROP_PERFORM;
break;
}
default: {
// unknown status
events::DropCollection(name(), colName, TRI_ERROR_INTERNAL);
return TRI_ERROR_INTERNAL;
}
}
events::DropCollection(name(), colName, TRI_ERROR_NO_ERROR);
return TRI_ERROR_NO_ERROR;
}
/// @brief stop operations in this vocbase. must be called prior to
/// shutdown to clean things up
void TRI_vocbase_t::stop() {
try {
// stop replication
if (_replicationApplier != nullptr) {
_replicationApplier->stopAndJoin();
}
// mark all cursors as deleted so underlying collections can be freed soon
_cursorRepository->garbageCollect(true);
// mark all collection keys as deleted so underlying collections can be freed
// soon, we have to retry, since some of these collection keys might currently
// still being in use:
auto lastTime = TRI_microtime();
_collectionKeys->stopStores();
while (true) {
if (!_collectionKeys->garbageCollect(true)) {
break;
}
std::this_thread::sleep_for(std::chrono::milliseconds(100));
if (TRI_microtime() - lastTime > 1.0) {
LOG_TOPIC("ddaae", WARN, Logger::STARTUP)
<< "Have collection keys left over, keep trying to garbage collect...";
lastTime = TRI_microtime();
}
}
} catch (...) {
// we are calling this on shutdown, and always want to go on from here
}
}
/// @brief closes a database and all collections
void TRI_vocbase_t::shutdown() {
this->stop();
std::vector<std::shared_ptr<arangodb::LogicalCollection>> collections;
{
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
collections = _collections;
}
// from here on, the vocbase is unusable, i.e. no collections can be
// created/loaded etc.
// starts unloading of collections
for (auto& collection : collections) {
{
WRITE_LOCKER_EVENTUAL(locker, collection->lock());
collection->close(); // required to release indexes
}
unloadCollection(collection.get(), true);
}
// this will signal the compactor thread to do one last iteration
setState(TRI_vocbase_t::State::SHUTDOWN_COMPACTOR);
StorageEngine* engine = EngineSelectorFeature::ENGINE;
engine->shutdownDatabase(*this); // shutdownDatabase() stops all threads
// this will signal the cleanup thread to do one last iteration
setState(TRI_vocbase_t::State::SHUTDOWN_CLEANUP);
{
RECURSIVE_WRITE_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
checkCollectionInvariants();
_dataSourceByName.clear();
_dataSourceById.clear();
_dataSourceByUuid.clear();
checkCollectionInvariants();
}
_deadCollections.clear();
// free collections
for (auto& collection : _collections) {
collection->getPhysical()->close();
}
_collections.clear();
}
/// @brief returns names of all known (document) collections
std::vector<std::string> TRI_vocbase_t::collectionNames() {
std::vector<std::string> result;
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
result.reserve(_dataSourceByName.size());
for (auto& entry : _dataSourceByName) {
TRI_ASSERT(entry.second);
if (entry.second->category() != LogicalCollection::category()) {
continue;
}
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
auto view = std::dynamic_pointer_cast<arangodb::LogicalCollection>(entry.second);
TRI_ASSERT(view);
#else
auto view = std::static_pointer_cast<arangodb::LogicalCollection>(entry.second);
#endif
result.emplace_back(entry.first);
}
return result;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief returns all known (document) collections with their parameters
/// and indexes, up to a specific tick value
/// while the collections are iterated over, there will be a global lock so
/// that there will be consistent view of collections & their properties
/// The list of collections will be sorted if sort function is given
////////////////////////////////////////////////////////////////////////////////
void TRI_vocbase_t::inventory(VPackBuilder& result, TRI_voc_tick_t maxTick,
std::function<bool(arangodb::LogicalCollection const*)> const& nameFilter) {
TRI_ASSERT(result.isOpenObject());
// cycle on write-lock
WRITE_LOCKER_EVENTUAL(writeLock, _inventoryLock);
std::vector<std::shared_ptr<arangodb::LogicalCollection>> collections;
std::unordered_map<TRI_voc_cid_t, std::shared_ptr<LogicalDataSource>> dataSourceById;
// copy collection pointers into vector so we can work with the copy without
// the global lock
{
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
collections = _collections;
dataSourceById = _dataSourceById;
}
if (collections.size() > 1) {
// sort by type first and then only name
// sorting by type ensures that document collections are reported before
// edge collections
std::sort(collections.begin(), collections.end(),
[](std::shared_ptr<LogicalCollection> const& lhs,
std::shared_ptr<LogicalCollection> const& rhs) -> bool {
if (lhs->type() != rhs->type()) {
return lhs->type() < rhs->type();
}
return lhs->name() < rhs->name();
});
}
ExecContext const* exec = ExecContext::CURRENT;
result.add("collections", VPackValue(VPackValueType::Array));
for (auto& collection : collections) {
READ_LOCKER(readLocker, collection->_lock);
if (collection->status() == TRI_VOC_COL_STATUS_DELETED ||
collection->status() == TRI_VOC_COL_STATUS_CORRUPTED) {
// we do not need to care about deleted or corrupted collections
continue;
}
// In cluster case cids are not created by ticks but by cluster uniqIds
if (!ServerState::instance()->isRunningInCluster() && collection->id() > maxTick) {
// collection is too new
continue;
}
// check if we want this collection
if (!nameFilter(collection.get())) {
continue;
}
if (exec != nullptr &&
!exec->canUseCollection(_name, collection->name(), auth::Level::RO)) {
continue;
}
if (collection->id() <= maxTick) {
result.openObject();
// why are indexes added separately, when they are added by
// collection->toVelocyPackIgnore !?
result.add(VPackValue("indexes"));
collection->getIndexesVPack(result, [](arangodb::Index const* idx, decltype(Index::makeFlags())& flags) {
// we have to exclude the primary and edge index for dump / restore
switch (idx->type()) {
case Index::TRI_IDX_TYPE_PRIMARY_INDEX:
case Index::TRI_IDX_TYPE_EDGE_INDEX:
return false;
default:
flags = Index::makeFlags(Index::Serialize::Basics);
return !idx->isHidden();
}
});
result.add("parameters", VPackValue(VPackValueType::Object));
collection->toVelocyPackIgnore(
result, {"objectId", "path", "statusString", "indexes"},
LogicalDataSource::Serialization::Inventory);
result.close();
result.close();
}
}
result.close(); // </collection>
result.add("views", VPackValue(VPackValueType::Array, true));
LogicalView::enumerate(*this, [&result](LogicalView::ptr const& view) -> bool {
if (view) {
result.openObject();
view->properties(result, LogicalDataSource::Serialization::Inventory);
result.close();
}
return true;
});
result.close(); // </views>
}
/// @brief looks up a collection by identifier
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::lookupCollection(TRI_voc_cid_t id) const
noexcept {
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
return std::dynamic_pointer_cast<arangodb::LogicalCollection>(lookupDataSource(id));
#else
auto dataSource = lookupDataSource(id);
return dataSource && dataSource->category() == LogicalCollection::category()
? std::static_pointer_cast<LogicalCollection>(dataSource)
: nullptr;
#endif
}
/// @brief looks up a collection by name or stringified cid or uuid
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::lookupCollection(
std::string const& nameOrId) const noexcept {
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
return std::dynamic_pointer_cast<arangodb::LogicalCollection>(lookupDataSource(nameOrId));
#else
auto dataSource = lookupDataSource(nameOrId);
return dataSource && dataSource->category() == LogicalCollection::category()
? std::static_pointer_cast<LogicalCollection>(dataSource)
: nullptr;
#endif
}
/// @brief looks up a collection by uuid
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::lookupCollectionByUuid(
std::string const& uuid) const noexcept {
// otherwise we'll look up the collection by name
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
auto itr = _dataSourceByUuid.find(uuid);
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
return itr == _dataSourceByUuid.end()
? nullptr
: std::dynamic_pointer_cast<arangodb::LogicalCollection>(itr->second);
#else
return itr == _dataSourceByUuid.end() ||
itr->second->category() != LogicalCollection::category()
? nullptr
: std::static_pointer_cast<LogicalCollection>(itr->second);
#endif
}
/// @brief looks up a data-source by identifier
std::shared_ptr<arangodb::LogicalDataSource> TRI_vocbase_t::lookupDataSource(
TRI_voc_cid_t id) const noexcept {
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
auto itr = _dataSourceById.find(id);
return itr == _dataSourceById.end() ? nullptr : itr->second;
}
/// @brief looks up a data-source by name
std::shared_ptr<arangodb::LogicalDataSource> TRI_vocbase_t::lookupDataSource(
std::string const& nameOrId) const noexcept {
if (nameOrId.empty()) {
return nullptr;
}
// lookup by id if the data-source name is passed as a stringified id
bool success = false;
auto id =
arangodb::NumberUtils::atoi<TRI_voc_cid_t>(nameOrId.data(),
nameOrId.data() + nameOrId.size(), success);
if (success) {
return lookupDataSource(id);
}
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
// otherwise look up the data-source by name
auto itr = _dataSourceByName.find(nameOrId);
if (itr != _dataSourceByName.end()) {
return itr->second;
}
// otherwise look up the data-source by UUID
auto itrUuid = _dataSourceByUuid.find(nameOrId);
return itrUuid == _dataSourceByUuid.end() ? nullptr : itrUuid->second;
}
/// @brief looks up a view by identifier
std::shared_ptr<arangodb::LogicalView> TRI_vocbase_t::lookupView(TRI_voc_cid_t id) const {
TRI_ASSERT(!ServerState::instance()->isCoordinator());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
return std::dynamic_pointer_cast<arangodb::LogicalView>(lookupDataSource(id));
#else
auto dataSource = lookupDataSource(id);
return dataSource && dataSource->category() == LogicalView::category()
? std::static_pointer_cast<LogicalView>(dataSource)
: nullptr;
#endif
}
/// @brief looks up a view by name or stringified cid or uuid
std::shared_ptr<arangodb::LogicalView> TRI_vocbase_t::lookupView(std::string const& nameOrId) const {
TRI_ASSERT(!ServerState::instance()->isCoordinator());
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
return std::dynamic_pointer_cast<arangodb::LogicalView>(lookupDataSource(nameOrId));
#else
auto dataSource = lookupDataSource(nameOrId);
return dataSource && dataSource->category() == LogicalView::category()
? std::static_pointer_cast<LogicalView>(dataSource)
: nullptr;
#endif
}
/// @brief creates a new collection from parameter set
/// collection id (cid) is normally passed with a value of 0
/// this means that the system will assign a new collection id automatically
/// using a cid of > 0 is supported to import dumps from other servers etc.
/// but the functionality is not advertised
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::createCollection(
arangodb::velocypack::Slice parameters) {
// check that the name does not contain any strange characters
if (!IsAllowedName(parameters)) {
std::string name;
if (parameters.isObject()) {
name = VelocyPackHelper::getStringValue(parameters,
StaticStrings::DataSourceName, "");
}
events::CreateCollection(this->name(), name, TRI_ERROR_ARANGO_ILLEGAL_NAME);
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_ILLEGAL_NAME);
}
// augment creation parameters
StorageEngine* engine = EngineSelectorFeature::ENGINE;
TRI_ASSERT(engine != nullptr);
VPackBuilder merge;
merge.openObject();
engine->addParametersForNewCollection(merge, parameters);
merge.close();
merge = VPackCollection::merge(parameters, merge.slice(), true, false);
parameters = merge.slice();
READ_LOCKER(readLocker, _inventoryLock);
// note: cid may be modified by this function call
auto collection = createCollectionWorker(parameters);
if (collection == nullptr) {
// something went wrong... must not continue
return nullptr;
}
auto res2 = engine->persistCollection(*this, *collection);
// API compatibility, we always return the collection,
// even if creation failed.
if (DatabaseFeature::DATABASE != nullptr &&
DatabaseFeature::DATABASE->versionTracker() != nullptr) {
DatabaseFeature::DATABASE->versionTracker()->track("create collection");
}
return collection;
}
/// @brief unloads a collection
int TRI_vocbase_t::unloadCollection(arangodb::LogicalCollection* collection, bool force) {
{
WRITE_LOCKER_EVENTUAL(locker, collection->_lock);
// cannot unload a corrupted collection
if (collection->status() == TRI_VOC_COL_STATUS_CORRUPTED) {
return TRI_set_errno(TRI_ERROR_ARANGO_CORRUPTED_COLLECTION);
}
// an unloaded collection is unloaded
if (collection->status() == TRI_VOC_COL_STATUS_UNLOADED) {
return TRI_ERROR_NO_ERROR;
}
// an unloading collection is treated as unloaded
if (collection->status() == TRI_VOC_COL_STATUS_UNLOADING) {
return TRI_ERROR_NO_ERROR;
}
// a loading collection
if (collection->status() == TRI_VOC_COL_STATUS_LOADING) {
// throw away the write locker. we're going to switch to a read locker now
locker.unlock();
// loop until status changes
while (1) {
TRI_vocbase_col_status_e status;
{
READ_LOCKER_EVENTUAL(readLocker, collection->_lock);
status = collection->status();
}
if (status != TRI_VOC_COL_STATUS_LOADING) {
break;
}
// sleep without lock
std::this_thread::sleep_for(
std::chrono::microseconds(collectionStatusPollInterval()));
}
// if we get here, the status has changed
return unloadCollection(collection, force);
}
// a deleted collection is treated as unloaded
if (collection->status() == TRI_VOC_COL_STATUS_DELETED) {
return TRI_ERROR_NO_ERROR;
}
// must be loaded
if (collection->status() != TRI_VOC_COL_STATUS_LOADED) {
return TRI_ERROR_INTERNAL;
}
// mark collection as unloading
collection->setStatus(TRI_VOC_COL_STATUS_UNLOADING);
} // release locks
collection->unload();
// wake up the cleanup thread
StorageEngine* engine = EngineSelectorFeature::ENGINE;
engine->unloadCollection(*this, *collection);
return TRI_ERROR_NO_ERROR;
}
/// @brief drops a collection
arangodb::Result TRI_vocbase_t::dropCollection(TRI_voc_cid_t cid,
bool allowDropSystem, double timeout) {
auto collection = lookupCollection(cid);
if (!collection) {
events::DropCollection(name(), "", TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
StorageEngine* engine = EngineSelectorFeature::ENGINE;
if (!engine) {
events::DropCollection(name(), collection->name(), TRI_ERROR_INTERNAL);
return arangodb::Result(
TRI_ERROR_INTERNAL,
std::string(
"failed to find StorageEngine while dropping collection '") +
collection->name() + "'");
}
if (!allowDropSystem && collection->system() && !engine->inRecovery()) {
// prevent dropping of system collections
events::DropCollection(name(), collection->name(), TRI_ERROR_FORBIDDEN);
return TRI_set_errno(TRI_ERROR_FORBIDDEN);
}
while (true) {
DropState state = DROP_EXIT;
int res;
{
READ_LOCKER(readLocker, _inventoryLock);
res = dropCollectionWorker(collection.get(), state, timeout);
}
if (state == DROP_PERFORM) {
if (engine->inRecovery()) {
DropCollectionCallback(*collection);
} else {
collection->deferDropCollection(DropCollectionCallback);
engine->signalCleanup(collection->vocbase()); // wake up the cleanup thread
}
if (DatabaseFeature::DATABASE != nullptr &&
DatabaseFeature::DATABASE->versionTracker() != nullptr) {
DatabaseFeature::DATABASE->versionTracker()->track("drop collection");
}
}
if (state == DROP_PERFORM || state == DROP_EXIT) {
events::DropCollection(name(), collection->name(), res);
return res;
}
// try again in next iteration
TRI_ASSERT(state == DROP_AGAIN);
std::this_thread::sleep_for(std::chrono::microseconds(collectionStatusPollInterval()));
}
}
/// @brief renames a view
arangodb::Result TRI_vocbase_t::renameView(TRI_voc_cid_t cid, std::string const& oldName) {
TRI_ASSERT(!ServerState::instance()->isCoordinator());
auto const view = lookupView(cid);
if (!view) {
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
auto* databaseFeature =
application_features::ApplicationServer::lookupFeature<DatabaseFeature>(
"Database");
if (!databaseFeature) {
return Result(
TRI_ERROR_INTERNAL,
std::string("failed to find feature 'Database' while renaming view '") +
view->name() + "' in database '" + name() + "'");
}
auto* engine = EngineSelectorFeature::ENGINE;
if (!engine) {
return arangodb::Result(
TRI_ERROR_INTERNAL,
std::string("failed to find StorageEngine while renaming view '") +
view->name() + "' in database '" + name() + "'");
}
// lock collection because we are going to copy its current name
auto newName = view->name();
// old name should be different
// check if names are actually different
if (oldName == newName) {
return TRI_ERROR_NO_ERROR;
}
if (!IsAllowedName(IsSystemName(newName), arangodb::velocypack::StringRef(newName))) {
return TRI_set_errno(TRI_ERROR_ARANGO_ILLEGAL_NAME);
}
READ_LOCKER(readLocker, _inventoryLock);
RECURSIVE_WRITE_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
// Check for duplicate name
auto it = _dataSourceByName.find(newName);
if (it != _dataSourceByName.end()) {
// new name already in use
return TRI_ERROR_ARANGO_DUPLICATE_NAME;
}
// get the original pointer and ensure it's a LogicalView
auto itr1 = _dataSourceByName.find(oldName);
if (itr1 == _dataSourceByName.end() ||
LogicalView::category() != itr1->second->category()) {
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
TRI_ASSERT(std::dynamic_pointer_cast<arangodb::LogicalView>(itr1->second));
auto doSync = databaseFeature->forceSyncProperties();
auto res = engine->inRecovery()
? arangodb::Result() // skip persistence while in recovery
// since definition already from engine
: engine->changeView(*this, *view, doSync);
if (!res.ok()) {
return res;
}
// stores the parameters on disk
auto itr2 = _dataSourceByName.emplace(newName, itr1->second);
TRI_ASSERT(itr2.second);
_dataSourceByName.erase(itr1);
checkCollectionInvariants();
// invalidate all entries in the plan and query cache now
arangodb::aql::PlanCache::instance()->invalidate(this);
arangodb::aql::QueryCache::instance()->invalidate(this);
return TRI_ERROR_NO_ERROR;
}
/// @brief renames a collection
arangodb::Result TRI_vocbase_t::renameCollection(TRI_voc_cid_t cid,
std::string const& newName) {
auto collection = lookupCollection(cid);
if (!collection) {
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
if (collection->system()) {
return TRI_set_errno(TRI_ERROR_FORBIDDEN);
}
// lock collection because we are going to copy its current name
std::string oldName = collection->name();
// old name should be different
// check if names are actually different
if (oldName == newName) {
return TRI_ERROR_NO_ERROR;
}
READ_LOCKER(readLocker, _inventoryLock);
RECURSIVE_WRITE_LOCKER_NAMED(writeLocker, _dataSourceLock, _dataSourceLockWriteOwner, false);
CONDITIONAL_WRITE_LOCKER(locker, collection->_lock, false);
while (true) {
TRI_ASSERT(!writeLocker.isLocked());
TRI_ASSERT(!locker.isLocked());
// block until we have acquired this lock
writeLocker.lock();
// we now have the one lock
TRI_ASSERT(writeLocker.isLocked());
if (locker.tryLock()) {
// we now have both locks and can continue outside of this loop
break;
}
// unlock the write locker so we don't block other operations
writeLocker.unlock();
TRI_ASSERT(!writeLocker.isLocked());
TRI_ASSERT(!locker.isLocked());
// sleep for a while
std::this_thread::yield();
std::this_thread::sleep_for(std::chrono::microseconds(10000));
}
TRI_ASSERT(writeLocker.isLocked());
TRI_ASSERT(locker.isLocked());
// Check for duplicate name
auto itr = _dataSourceByName.find(newName);
if (itr != _dataSourceByName.end()) {
return TRI_ERROR_ARANGO_DUPLICATE_NAME;
}
// get the original pointer and ensure it's a LogicalCollection
auto itr1 = _dataSourceByName.find(oldName);
if (itr1 == _dataSourceByName.end() ||
LogicalCollection::category() != itr1->second->category()) {
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
TRI_ASSERT(std::dynamic_pointer_cast<arangodb::LogicalCollection>(itr1->second));
auto res = itr1->second->rename(std::string(newName));
if (!res.ok()) {
return res.errorNumber(); // rename failed
}
auto* engine = EngineSelectorFeature::ENGINE;
TRI_ASSERT(engine);
res = engine->renameCollection(*this, *collection, oldName); // tell the engine
if (!res.ok()) {
return res.errorNumber(); // rename failed
}
// The collection is renamed. Now swap cache entries.
auto it2 = _dataSourceByName.emplace(newName, itr1->second);
TRI_ASSERT(it2.second);
_dataSourceByName.erase(itr1);
checkCollectionInvariants();
locker.unlock();
writeLocker.unlock();
if (DatabaseFeature::DATABASE != nullptr &&
DatabaseFeature::DATABASE->versionTracker() != nullptr) {
DatabaseFeature::DATABASE->versionTracker()->track("rename collection");
}
// invalidate all entries for the two collections
arangodb::aql::PlanCache::instance()->invalidate(this);
return TRI_ERROR_NO_ERROR;
}
/// @brief locks a collection for usage, loading or manifesting it
int TRI_vocbase_t::useCollection(arangodb::LogicalCollection* collection,
TRI_vocbase_col_status_e& status) {
return loadCollection(collection, status);
}
/// @brief locks a (document) collection for usage by id
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::useCollection(
TRI_voc_cid_t cid, TRI_vocbase_col_status_e& status) {
return useCollectionInternal(lookupCollection(cid), status);
}
/// @brief locks a collection for usage by name
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::useCollection(
std::string const& name, TRI_vocbase_col_status_e& status) {
// check that we have an existing name
std::shared_ptr<arangodb::LogicalCollection> collection;
{
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
auto it = _dataSourceByName.find(name);
if (it != _dataSourceByName.end() &&
it->second->category() == LogicalCollection::category()) {
TRI_ASSERT(std::dynamic_pointer_cast<LogicalCollection>(it->second));
collection = std::static_pointer_cast<LogicalCollection>(it->second);
}
}
return useCollectionInternal(std::move(collection), status);
}
std::shared_ptr<arangodb::LogicalCollection> TRI_vocbase_t::useCollectionInternal(
std::shared_ptr<arangodb::LogicalCollection> coll, TRI_vocbase_col_status_e& status) {
if (!coll) {
TRI_set_errno(TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
return nullptr;
}
// try to load the collection
int res = loadCollection(coll.get(), status);
if (res == TRI_ERROR_NO_ERROR) {
return coll;
}
TRI_set_errno(res);
return nullptr;
}
/// @brief releases a collection from usage
void TRI_vocbase_t::releaseCollection(arangodb::LogicalCollection* collection) {
collection->_lock.unlock();
}
/// @brief creates a new view from parameter set
/// view id is normally passed with a value of 0
/// this means that the system will assign a new id automatically
/// using a cid of > 0 is supported to import dumps from other servers etc.
/// but the functionality is not advertised
std::shared_ptr<arangodb::LogicalView> TRI_vocbase_t::createView(arangodb::velocypack::Slice parameters) {
TRI_ASSERT(!ServerState::instance()->isCoordinator());
auto* engine = EngineSelectorFeature::ENGINE;
if (!engine) {
std::string n;
if (parameters.isObject()) {
n = VelocyPackHelper::getStringValue(parameters,
StaticStrings::DataSourceName, "");
}
events::CreateView(name(), n, TRI_ERROR_INTERNAL);
THROW_ARANGO_EXCEPTION_MESSAGE(
TRI_ERROR_INTERNAL,
"failure to get storage engine during creation of view");
}
// check that the name does not contain any strange characters
if (!IsAllowedName(parameters)) {
std::string n;
if (parameters.isObject()) {
n = VelocyPackHelper::getStringValue(parameters,
StaticStrings::DataSourceName, "");
}
events::CreateView(name(), n, TRI_ERROR_ARANGO_ILLEGAL_NAME);
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_ILLEGAL_NAME);
}
arangodb::LogicalView::ptr view;
auto res = LogicalView::instantiate(view, *this, parameters);
if (!res.ok() || !view) {
std::string n;
if (parameters.isObject()) {
n = VelocyPackHelper::getStringValue(parameters,
StaticStrings::DataSourceName, "");
}
events::CreateView(name(), n, res.errorNumber());
THROW_ARANGO_EXCEPTION_MESSAGE(
res.errorNumber(),
res.errorMessage().empty()
? std::string("failed to instantiate view from definition: ") + parameters.toString()
: res.errorMessage());
}
READ_LOCKER(readLocker, _inventoryLock);
RECURSIVE_WRITE_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
auto itr = _dataSourceByName.find(view->name());
if (itr != _dataSourceByName.end()) {
events::CreateView(name(), view->name(), TRI_ERROR_ARANGO_DUPLICATE_NAME);
THROW_ARANGO_EXCEPTION(TRI_ERROR_ARANGO_DUPLICATE_NAME);
}
registerView(basics::ConditionalLocking::DoNotLock, view);
try {
auto res = engine->createView(view->vocbase(), view->id(), *view);
if (!res.ok()) {
unregisterView(*view);
THROW_ARANGO_EXCEPTION(res);
}
} catch (...) {
unregisterView(*view);
events::CreateView(name(), view->name(), TRI_ERROR_INTERNAL);
throw;
}
events::CreateView(name(), view->name(), TRI_ERROR_NO_ERROR);
if (DatabaseFeature::DATABASE != nullptr &&
DatabaseFeature::DATABASE->versionTracker() != nullptr) {
DatabaseFeature::DATABASE->versionTracker()->track("create view");
}
view->open(); // And lets open it.
return view;
}
/// @brief drops a view
arangodb::Result TRI_vocbase_t::dropView(TRI_voc_cid_t cid, bool allowDropSystem) {
TRI_ASSERT(!ServerState::instance()->isCoordinator());
auto const view = lookupView(cid);
if (!view) {
events::DropView(name(), "", TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND);
return TRI_ERROR_ARANGO_DATA_SOURCE_NOT_FOUND;
}
StorageEngine* engine = EngineSelectorFeature::ENGINE;
if (!engine) {
events::DropView(name(), view->name(), TRI_ERROR_INTERNAL);
return arangodb::Result(
TRI_ERROR_INTERNAL,
std::string("failed to find StorageEngine while dropping view '") +
view->name() + "'");
}
if (!allowDropSystem && view->system() && !engine->inRecovery()) {
events::DropView(name(), view->name(), TRI_ERROR_FORBIDDEN);
return TRI_ERROR_FORBIDDEN; // prevent dropping of system views
}
READ_LOCKER(readLocker, _inventoryLock);
// do not acquire these locks instantly
RECURSIVE_WRITE_LOCKER_NAMED(writeLocker, _dataSourceLock, _dataSourceLockWriteOwner,
basics::ConditionalLocking::DoNotLock);
CONDITIONAL_WRITE_LOCKER(locker, view->_lock, basics::ConditionalLocking::DoNotLock);
while (true) {
TRI_ASSERT(!writeLocker.isLocked());
TRI_ASSERT(!locker.isLocked());
// block until we have acquired this lock
writeLocker.lock();
// we now have the one lock
TRI_ASSERT(writeLocker.isLocked());
if (locker.tryLock()) {
// we now have both locks and can continue outside of this loop
break;
}
// unlock the write locker so we don't block other operations
writeLocker.unlock();
TRI_ASSERT(!writeLocker.isLocked());
TRI_ASSERT(!locker.isLocked());
// sleep for a while
std::this_thread::yield();
std::this_thread::sleep_for(std::chrono::microseconds(10000));
}
TRI_ASSERT(writeLocker.isLocked());
TRI_ASSERT(locker.isLocked());
auto res = engine->dropView(*this, *view);
if (!res.ok()) {
events::DropView(name(), view->name(), res.errorNumber());
return res;
}
// invalidate all entries in the plan and query cache now
#if USE_PLAN_CACHE
arangodb::aql::PlanCache::instance()->invalidate(this);
#endif
arangodb::aql::QueryCache::instance()->invalidate(this);
unregisterView(*view);
locker.unlock();
writeLocker.unlock();
events::DropView(name(), view->name(), TRI_ERROR_NO_ERROR);
if (DatabaseFeature::DATABASE != nullptr &&
DatabaseFeature::DATABASE->versionTracker() != nullptr) {
DatabaseFeature::DATABASE->versionTracker()->track("drop view");
}
return TRI_ERROR_NO_ERROR;
}
/// @brief create a vocbase object
TRI_vocbase_t::TRI_vocbase_t(TRI_vocbase_type_e type, TRI_voc_tick_t id,
std::string const& name)
: _id(id),
_name(name),
_type(type),
_refCount(0),
_state(TRI_vocbase_t::State::NORMAL),
_isOwnAppsDirectory(true),
_deadlockDetector(false),
_userStructures(nullptr) {
_queries.reset(new arangodb::aql::QueryList(this));
_cursorRepository.reset(new arangodb::CursorRepository(*this));
_collectionKeys.reset(new arangodb::CollectionKeysRepository());
// init collections
_collections.reserve(32);
_deadCollections.reserve(32);
TRI_CreateUserStructuresVocBase(this);
}
/// @brief destroy a vocbase object
TRI_vocbase_t::~TRI_vocbase_t() {
if (_userStructures != nullptr) {
TRI_FreeUserStructuresVocBase(this);
}
StorageEngine* engine = EngineSelectorFeature::ENGINE;
engine->shutdownDatabase(*this);
// do a final cleanup of collections
for (auto& it : _collections) {
WRITE_LOCKER_EVENTUAL(locker, it->lock());
it->close(); // required to release indexes
}
_collections.clear(); // clear vector before deallocating TRI_vocbase_t members
_deadCollections.clear(); // clear vector before deallocating TRI_vocbase_t members
_dataSourceById.clear(); // clear map before deallocating TRI_vocbase_t members
_dataSourceByName.clear(); // clear map before deallocating TRI_vocbase_t members
_dataSourceByUuid.clear(); // clear map before deallocating TRI_vocbase_t members
}
std::string TRI_vocbase_t::path() const {
StorageEngine* engine = EngineSelectorFeature::ENGINE;
return engine->databasePath(this);
}
bool TRI_vocbase_t::IsAllowedName(arangodb::velocypack::Slice slice) noexcept {
return !slice.isObject()
? false
: IsAllowedName(arangodb::basics::VelocyPackHelper::readBooleanValue(
slice, StaticStrings::DataSourceSystem, false),
arangodb::basics::VelocyPackHelper::getStringRef(
slice, StaticStrings::DataSourceName, ""));
}
/// @brief checks if a database name is allowed
/// returns true if the name is allowed and false otherwise
bool TRI_vocbase_t::IsAllowedName(bool allowSystem,
arangodb::velocypack::StringRef const& name) noexcept {
size_t length = 0;
// check allow characters: must start with letter or underscore if system is
// allowed
for (char const* ptr = name.data(); length < name.size(); ++ptr, ++length) {
bool ok;
if (length == 0) {
ok = ('a' <= *ptr && *ptr <= 'z') || ('A' <= *ptr && *ptr <= 'Z') || (allowSystem && *ptr == '_');
} else {
ok = ('a' <= *ptr && *ptr <= 'z') || ('A' <= *ptr && *ptr <= 'Z') ||
(*ptr == '_') || (*ptr == '-') || ('0' <= *ptr && *ptr <= '9');
}
if (!ok) {
return false;
}
}
return (length > 0 && length <= TRI_COL_NAME_LENGTH);
}
/// @brief determine whether a collection name is a system collection name
/*static*/ bool TRI_vocbase_t::IsSystemName(std::string const& name) noexcept {
return !name.empty() && name[0] == '_';
}
void TRI_vocbase_t::addReplicationApplier() {
TRI_ASSERT(_type != TRI_VOCBASE_TYPE_COORDINATOR);
auto* applier = DatabaseReplicationApplier::create(*this);
_replicationApplier.reset(applier);
}
std::vector<std::shared_ptr<arangodb::LogicalView>> TRI_vocbase_t::views() {
TRI_ASSERT(!ServerState::instance()->isCoordinator());
std::vector<std::shared_ptr<arangodb::LogicalView>> views;
{
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
views.reserve(_dataSourceById.size());
for (auto& entry : _dataSourceById) {
TRI_ASSERT(entry.second);
if (entry.second->category() != LogicalView::category()) {
continue;
}
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
auto view = std::dynamic_pointer_cast<arangodb::LogicalView>(entry.second);
TRI_ASSERT(view);
#else
auto view = std::static_pointer_cast<arangodb::LogicalView>(entry.second);
#endif
views.emplace_back(view);
}
}
return views;
}
void TRI_vocbase_t::processCollections(std::function<void(LogicalCollection*)> const& cb,
bool includeDeleted) {
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
if (includeDeleted) {
for (auto const& it : _collections) {
cb(it.get());
}
} else {
for (auto& entry : _dataSourceById) {
TRI_ASSERT(entry.second);
if (entry.second->category() != LogicalCollection::category()) {
continue;
}
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
auto collection =
std::dynamic_pointer_cast<arangodb::LogicalCollection>(entry.second);
TRI_ASSERT(collection);
#else
auto collection =
std::static_pointer_cast<arangodb::LogicalCollection>(entry.second);
#endif
cb(collection.get());
}
}
}
std::vector<std::shared_ptr<arangodb::LogicalCollection>> TRI_vocbase_t::collections(bool includeDeleted) {
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
if (includeDeleted) {
return _collections; // create copy
}
std::vector<std::shared_ptr<arangodb::LogicalCollection>> collections;
collections.reserve(_dataSourceById.size());
for (auto& entry : _dataSourceById) {
TRI_ASSERT(entry.second);
if (entry.second->category() != LogicalCollection::category()) {
continue;
}
#ifdef ARANGODB_ENABLE_MAINTAINER_MODE
auto collection =
std::dynamic_pointer_cast<arangodb::LogicalCollection>(entry.second);
TRI_ASSERT(collection);
#else
auto collection =
std::static_pointer_cast<arangodb::LogicalCollection>(entry.second);
#endif
collections.emplace_back(collection);
}
return collections;
}
bool TRI_vocbase_t::visitDataSources(dataSourceVisitor const& visitor, bool lockWrite /*= false*/
) {
TRI_ASSERT(visitor);
if (!lockWrite) {
RECURSIVE_READ_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
for (auto& entry : _dataSourceById) {
if (entry.second && !visitor(*(entry.second))) {
return false;
}
}
return true;
}
RECURSIVE_WRITE_LOCKER(_dataSourceLock, _dataSourceLockWriteOwner);
std::vector<std::shared_ptr<arangodb::LogicalDataSource>> dataSources;
dataSources.reserve(_dataSourceById.size());
// create a copy of all the datasource in case 'visitor' modifies
// '_dataSourceById'
for (auto& entry : _dataSourceById) {
dataSources.emplace_back(entry.second);
}
for (auto& dataSource : dataSources) {
if (dataSource && !visitor(*dataSource)) {
return false;
}
}
return true;
}
/// @brief extract the _rev attribute from a slice
TRI_voc_rid_t TRI_ExtractRevisionId(VPackSlice slice) {
slice = slice.resolveExternal();
TRI_ASSERT(slice.isObject());
VPackSlice r(slice.get(StaticStrings::RevString));
if (r.isString()) {
VPackValueLength l;
char const* p = r.getStringUnchecked(l);
return TRI_StringToRid(p, l, false);
}
if (r.isInteger()) {
return r.getNumber<TRI_voc_rid_t>();
}
return 0;
}
/// @brief extract the _rev attribute from a slice as a slice
VPackSlice TRI_ExtractRevisionIdAsSlice(VPackSlice const slice) {
if (!slice.isObject()) {
return VPackSlice();
}
return slice.get(StaticStrings::RevString);
}
/// @brief sanitize an object, given as slice, builder must contain an
/// open object which will remain open
/// the result is the object excluding _id, _key and _rev
void TRI_SanitizeObject(VPackSlice const slice, VPackBuilder& builder) {
TRI_ASSERT(slice.isObject());
VPackObjectIterator it(slice);
while (it.valid()) {
arangodb::velocypack::StringRef key(it.key());
// _id, _key, _rev. minimum size here is 3
if (key.size() < 3 || key[0] != '_' ||
(key != StaticStrings::KeyString && key != StaticStrings::IdString &&
key != StaticStrings::RevString)) {
builder.add(key.data(), key.size(), it.value());
}
it.next();
}
}
/// @brief sanitize an object, given as slice, builder must contain an
/// open object which will remain open. also excludes _from and _to
void TRI_SanitizeObjectWithEdges(VPackSlice const slice, VPackBuilder& builder) {
TRI_ASSERT(slice.isObject());
VPackObjectIterator it(slice, true);
while (it.valid()) {
arangodb::velocypack::StringRef key(it.key());
// _id, _key, _rev, _from, _to. minimum size here is 3
if (key.size() < 3 || key[0] != '_' ||
(key != StaticStrings::KeyString && key != StaticStrings::IdString &&
key != StaticStrings::RevString && key != StaticStrings::FromString &&
key != StaticStrings::ToString)) {
builder.add(key.data(), key.length(), it.value());
}
it.next();
}
}
/// @brief Convert a revision ID to a string
constexpr static TRI_voc_rid_t tickLimit =
static_cast<TRI_voc_rid_t>(2016ULL - 1970ULL) * 1000ULL * 60ULL * 60ULL * 24ULL * 365ULL;
std::string TRI_RidToString(TRI_voc_rid_t rid) {
if (rid <= tickLimit) {
return arangodb::basics::StringUtils::itoa(rid);
}
return HybridLogicalClock::encodeTimeStamp(rid);
}
/// encodes the uint64_t timestamp into the provided result buffer
/// the result buffer must be at least 11 chars long
/// the length of the encoded value and the start position into
/// the result buffer are returned by the function
std::pair<size_t, size_t> TRI_RidToString(TRI_voc_rid_t rid, char* result) {
if (rid <= tickLimit) {
std::pair<size_t, size_t> pos{0, 0};
pos.second = arangodb::basics::StringUtils::itoa(rid, result);
return pos;
}
return HybridLogicalClock::encodeTimeStamp(rid, result);
}
/// encodes the uint64_t timestamp into a temporary velocypack ValuePair,
/// using the specific temporary result buffer
/// the result buffer must be at least 11 chars long
arangodb::velocypack::ValuePair TRI_RidToValuePair(TRI_voc_rid_t rid, char* result) {
auto positions = TRI_RidToString(rid, result);
return arangodb::velocypack::ValuePair(&result[0] + positions.first, positions.second,
velocypack::ValueType::String);
}
/// @brief Convert a string into a revision ID, no check variant
TRI_voc_rid_t TRI_StringToRid(char const* p, size_t len, bool warn) {
bool isOld;
return TRI_StringToRid(p, len, isOld, warn);
}
/// @brief Convert a string into a revision ID, returns 0 if format invalid
TRI_voc_rid_t TRI_StringToRid(std::string const& ridStr, bool& isOld, bool warn) {
return TRI_StringToRid(ridStr.c_str(), ridStr.size(), isOld, warn);
}
/// @brief Convert a string into a revision ID, returns 0 if format invalid
TRI_voc_rid_t TRI_StringToRid(char const* p, size_t len, bool& isOld, bool warn) {
if (len > 0 && *p >= '1' && *p <= '9') {
auto r = NumberUtils::atoi_positive_unchecked<TRI_voc_rid_t>(p, p + len);
if (warn && r > tickLimit) {
// An old tick value that could be confused with a time stamp
LOG_TOPIC("66a3a", WARN, arangodb::Logger::FIXME)
<< "Saw old _rev value that could be confused with a time stamp!";
}
isOld = true;
return r;
}
isOld = false;
return HybridLogicalClock::decodeTimeStamp(p, len);
}
// -----------------------------------------------------------------------------
// --SECTION-- END-OF-FILE
// -----------------------------------------------------------------------------
Reference in New Issue View Git Blame Copy Permalink