| // Copyright 2017 The Fuchsia Authors |
| // |
| // 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. |
| |
| #include <memory> |
| #include <utility> |
| |
| #include "encoder/envelope_maker.h" |
| |
| #include "./logging.h" |
| |
| namespace cobalt { |
| namespace encoder { |
| |
| EnvelopeMaker::EnvelopeMaker(size_t max_bytes_each_observation, |
| size_t max_num_bytes) |
| : max_bytes_each_observation_(max_bytes_each_observation), |
| max_num_bytes_(max_num_bytes) {} |
| |
| ObservationStore::StoreStatus EnvelopeMaker::CanAddObservation( |
| const EncryptedMessage& message) { |
| // "+1" below is for the |scheme| field of EncryptedMessage. |
| size_t obs_size = |
| message.ciphertext().size() + message.public_key_fingerprint().size() + 1; |
| if (obs_size > max_bytes_each_observation_) { |
| VLOG(1) << "WARNING: An Observation that was too big was passed in to " |
| "EnvelopeMaker::CanAddObservation(): " |
| << obs_size; |
| return ObservationStore::kObservationTooBig; |
| } |
| |
| size_t new_num_bytes = num_bytes_ + obs_size; |
| if (new_num_bytes > max_num_bytes_) { |
| VLOG(6) << "new_num_bytes(" << new_num_bytes << ") > max_num_bytes_(" |
| << max_num_bytes_ << ")"; |
| VLOG(4) << "Envelope full."; |
| return ObservationStore::kStoreFull; |
| } |
| |
| return ObservationStore::kOk; |
| } |
| |
| ObservationStore::StoreStatus EnvelopeMaker::AddEncryptedObservation( |
| std::unique_ptr<EncryptedMessage> message, |
| std::unique_ptr<ObservationMetadata> metadata) { |
| auto status = CanAddObservation(*message); |
| if (status != ObservationStore::kOk) { |
| return status; |
| } |
| |
| // "+1" below is for the |scheme| field of EncryptedMessage. |
| num_bytes_ += message->ciphertext().size() + |
| message->public_key_fingerprint().size() + 1; |
| // Put the encrypted observation into the appropriate ObservationBatch. |
| GetBatch(std::move(metadata)) |
| ->add_encrypted_observation() |
| ->Swap(message.get()); |
| return ObservationStore::kOk; |
| } |
| |
| ObservationBatch* EnvelopeMaker::GetBatch( |
| std::unique_ptr<ObservationMetadata> metadata) { |
| // Serialize metadata. |
| std::string serialized_metadata; |
| (*metadata).SerializeToString(&serialized_metadata); |
| |
| // See if metadata is already in batch_map_. If so return it. |
| auto iter = batch_map_.find(serialized_metadata); |
| if (iter != batch_map_.end()) { |
| return iter->second; |
| } |
| |
| // Create a new ObservationBatch and add it to both envelope_ and batch_map_. |
| ObservationBatch* observation_batch = envelope_.add_batch(); |
| observation_batch->set_allocated_meta_data(metadata.release()); |
| batch_map_[serialized_metadata] = observation_batch; |
| return observation_batch; |
| } |
| |
| void EnvelopeMaker::MergeWith( |
| std::unique_ptr<ObservationStore::EnvelopeHolder> other_ref) { |
| CHECK(other_ref); |
| auto other = std::unique_ptr<EnvelopeMaker>( |
| static_cast<EnvelopeMaker*>(other_ref.release())); |
| // Iterate through the other's batch_map_. For each pair... |
| for (auto& other_pair : other->batch_map_) { |
| // see if we have a pair with the same key. |
| auto iter = batch_map_.find(other_pair.first); |
| if (iter != batch_map_.end()) { |
| // We do have a pair with the same key. Move the EncryptedMessages |
| // from the other's batch into our batch. Note that this process |
| // reverses the order of the messages in other but the order of |
| // the messages in a batch has no meaning so this doesn't matter. |
| auto* other_messages = other_pair.second->mutable_encrypted_observation(); |
| auto* this_messages = iter->second->mutable_encrypted_observation(); |
| while (!other_messages->empty()) { |
| this_messages->AddAllocated(other_messages->ReleaseLast()); |
| } |
| } else { |
| // We do not have a pair with the same key. Make one and swap the |
| // contents of the others batch into it. |
| ObservationBatch* observation_batch = envelope_.add_batch(); |
| observation_batch->Swap(other_pair.second); |
| batch_map_[other_pair.first] = observation_batch; |
| } |
| } |
| num_bytes_ += other->num_bytes_; |
| other->Clear(); |
| } |
| |
| } // namespace encoder |
| } // namespace cobalt |