diff --git a/services/backup/src/Reactors/server/PullBackupReactor.cpp b/services/backup/src/Reactors/server/PullBackupReactor.cpp index 52faa2aef..4e4045ff1 100644 --- a/services/backup/src/Reactors/server/PullBackupReactor.cpp +++ b/services/backup/src/Reactors/server/PullBackupReactor.cpp @@ -1,201 +1,203 @@ #include "PullBackupReactor.h" #include "DatabaseManager.h" #include namespace comm { namespace network { namespace reactor { PullBackupReactor::PullBackupReactor(const backup::PullBackupRequest *request) : ServerWriteReactorBase< backup::PullBackupRequest, backup::PullBackupResponse>(request), dataChunks(std::make_shared>(100)) { } void PullBackupReactor::initializeGetReactor(const std::string &holder) { if (this->backupItem == nullptr) { throw std::runtime_error( "get reactor cannot be initialized when backup item is missing"); } this->getReactor.reset(new reactor::BlobGetClientReactor( holder, this->dataChunks, &this->blobGetDoneCV)); this->getReactor->request.set_holder(holder); this->blobClient.get(this->getReactor); } void PullBackupReactor::initialize() { // we make sure that the blob client's state is flushed to the main memory // as there may be multiple threads from the pool taking over here const std::lock_guard lock(this->reactorStateMutex); if (this->request.userid().empty()) { throw std::runtime_error("no user id provided"); } if (this->request.backupid().empty()) { throw std::runtime_error("no backup id provided"); } this->backupItem = database::DatabaseManager::getInstance().findBackupItem( this->request.userid(), this->request.backupid()); if (this->backupItem == nullptr) { throw std::runtime_error( "no backup found for provided parameters: user id [" + this->request.userid() + "], backup id [" + this->request.backupid() + "]"); } this->logs = database::DatabaseManager::getInstance().findLogItemsForBackup( this->request.backupid()); } std::unique_ptr PullBackupReactor::writeResponse(backup::PullBackupResponse *response) { // we make sure that the blob client's state is flushed to the main memory // as there may be multiple threads from the pool taking over here const std::lock_guard lock(this->reactorStateMutex); if (this->state == State::COMPACTION) { response->set_backupid(this->backupItem->getBackupID()); if (this->getReactor == nullptr) { this->initializeGetReactor(this->backupItem->getCompactionHolder()); } std::string dataChunk; this->dataChunks->blockingRead(dataChunk); if (!dataChunk.empty()) { response->set_compactionchunk(dataChunk); return nullptr; } if (!this->dataChunks->isEmpty()) { throw std::runtime_error( "dangling data discovered after reading compaction"); } if (!this->getReactor->getStatusHolder()->getStatus().ok()) { throw std::runtime_error( this->getReactor->getStatusHolder()->getStatus().error_message()); } if (!this->backupItem->getAttachmentHolders().empty()) { this->state = State::COMPACTION_ATTACHMENTS; } else { this->state = State::LOGS; } return nullptr; } if (this->state == State::COMPACTION_ATTACHMENTS) { if (this->backupItem->getAttachmentHolders().empty()) { throw std::runtime_error("trying to send empty backup attachments"); } response->set_attachmentholders(this->backupItem->getAttachmentHolders()); this->state = State::LOGS; return nullptr; } if (this->state == State::LOGS) { // TODO make sure logs are received in correct order regardless their size if (this->logs.empty()) { // this means that there are no logs at all so we just terminate with // the compaction return std::make_unique(grpc::Status::OK); } if (this->currentLogIndex == this->logs.size()) { // we reached the end of the logs collection so we just want to // terminate either we terminate with an error if we have some dangling // data or with success if we don't if (!this->dataChunks->isEmpty()) { throw std::runtime_error("dangling data discovered after reading logs"); } return std::make_unique(grpc::Status::OK); } if (this->currentLogIndex > this->logs.size()) { // we went out of the scope of the logs collection, this should never // happen and should be perceived as an error throw std::runtime_error("log index out of bound"); } // this means that we're not reading anything between invocations of // writeResponse // it is only not null when we read data in chunks if (this->currentLog == nullptr) { this->currentLog = this->logs.at(this->currentLogIndex); if (this->currentLog->getPersistedInBlob()) { // if the item is stored in the blob, we initialize the get reactor // and proceed this->initializeGetReactor(this->currentLog->getValue()); } else { // if the item is persisted in the database, we just take it, send the // data to the client and reset currentLog so the next invocation of // writeResponse will take another one from the collection response->set_logid(this->currentLog->getLogID()); response->set_logchunk(this->currentLog->getValue()); if (!this->currentLog->getAttachmentHolders().empty()) { this->state = State::LOG_ATTACHMENTS; } else { this->nextLog(); } return nullptr; } } response->set_logid(this->currentLog->getLogID()); // we want to read the chunks from the blob through the get client until // we get an empty chunk - a sign of "end of chunks" std::string dataChunk; this->dataChunks->blockingRead(dataChunk); if (!this->getReactor->getStatusHolder()->getStatus().ok()) { throw std::runtime_error( this->getReactor->getStatusHolder()->getStatus().error_message()); } // if we get an empty chunk, we reset the currentLog so we can read the // next one from the logs collection. // If there's data inside, we write it to the client and proceed. if (dataChunk.empty()) { if (!this->currentLog->getAttachmentHolders().empty()) { this->state = State::LOG_ATTACHMENTS; } else { this->nextLog(); } return nullptr; } else { response->set_logchunk(dataChunk); } return nullptr; } if (this->state == State::LOG_ATTACHMENTS) { if (this->currentLog == nullptr) { throw std::runtime_error( "trying to send attachments of a non-existing log item"); } if (this->currentLog->getAttachmentHolders().empty()) { throw std::runtime_error("trying to send empty attachments"); } response->set_attachmentholders(this->currentLog->getAttachmentHolders()); this->nextLog(); return nullptr; } throw std::runtime_error("unhandled state"); } void PullBackupReactor::nextLog() { ++this->currentLogIndex; this->currentLog = nullptr; this->state = State::LOGS; } void PullBackupReactor::terminateCallback() { const std::lock_guard lock(this->reactorStateMutex); std::unique_lock lockGet(this->blobGetDoneCVMutex); - if (this->getReactor->getStatusHolder()->state != ReactorState::DONE) { - this->blobGetDoneCV.wait(lockGet); - } - if (this->getReactor->getStatusHolder()->state != ReactorState::DONE) { - throw std::runtime_error("get reactor has not been terminated properly"); - } - if (!this->getReactor->getStatusHolder()->getStatus().ok()) { - throw std::runtime_error( - this->getReactor->getStatusHolder()->getStatus().error_message()); + if (this->getReactor != nullptr) { + if (this->getReactor->getStatusHolder()->state != ReactorState::DONE) { + this->blobGetDoneCV.wait(lockGet); + } + if (this->getReactor->getStatusHolder()->state != ReactorState::DONE) { + throw std::runtime_error("get reactor has not been terminated properly"); + } + if (!this->getReactor->getStatusHolder()->getStatus().ok()) { + throw std::runtime_error( + this->getReactor->getStatusHolder()->getStatus().error_message()); + } } if (!this->getStatusHolder()->getStatus().ok()) { throw std::runtime_error( this->getStatusHolder()->getStatus().error_message()); } } } // namespace reactor } // namespace network } // namespace comm