checkpoint_manager.h

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
 
#pragma once
 
#include <semaphore.h>
 
#include "chain/state/chain_state.h"
#include "common/crypto/signature_verifier.h"
#include "interface/common/resdb_txn_accessor.h"
#include "platform/config/resdb_config.h"
#include "platform/consensus/checkpoint/checkpoint.h"
#include "platform/consensus/execution/transaction_executor.h"
#include "platform/networkstrate/replica_communicator.h"
#include "platform/networkstrate/server_comm.h"
#include "platform/proto/checkpoint_info.pb.h"
#include "platform/proto/resdb.pb.h"
 
namespace resdb {
 
class CheckPointManager : public CheckPoint {
 public:
  CheckPointManager(const ResDBConfig& config,
                    ReplicaCommunicator* replica_communicator,
                    SignatureVerifier* verifier);
  virtual ~CheckPointManager();
 
  ChainState* GetTxnDB();
  uint64_t GetMaxTxnSeq();
 
  void AddCommitData(std::unique_ptr<Request> request);
  int ProcessCheckPoint(std::unique_ptr<Context> context,
                        std::unique_ptr<Request> request);
 
  uint64_t GetStableCheckpoint() override;
  StableCheckPoint GetStableCheckpointWithVotes();
  bool IsValidCheckpointProof(const StableCheckPoint& stable_ckpt);
 
  void SetTimeoutHandler(std::function<void()> timeout_handler);
  virtual void UpdateStableCheckPointCallback(
      int64_t current_stable_checkpoint) {}
 
  void Stop();
 
  void TimeoutHandler();
 
  void WaitSignal();
  std::unique_ptr<std::pair<uint64_t, std::string>> PopStableSeqHash();
 
  void SetExecutor(TransactionExecutor* executor) { executor_ = executor; }
 
  uint64_t GetHighestPreparedSeq();
 
  void SetHighestPreparedSeq(uint64_t seq);
 
  sem_t* CommitableSeqSignal();
 
  uint64_t GetCommittableSeq();
 
 private:
  void UpdateCheckPointStatus();
  void UpdateStableCheckPointStatus();
  void BroadcastCheckPoint(uint64_t seq, const std::string& hash,
                           const std::vector<std::string>& stable_hashs,
                           const std::vector<uint64_t>& stable_seqs);
 
  void Notify();
  bool Wait();
 
 protected:
  ResDBConfig config_;
  ReplicaCommunicator* replica_communicator_;
  std::unique_ptr<ChainState> txn_db_;
  std::thread checkpoint_thread_, stable_checkpoint_thread_;
  SignatureVerifier* verifier_;
  std::atomic<bool> stop_;
  std::map<std::pair<uint64_t, std::string>, std::set<uint32_t>> sender_ckpt_;
  std::map<std::pair<uint64_t, std::string>, std::vector<SignatureInfo>>
      sign_ckpt_;
  std::map<std::pair<uint64_t, std::string>, std::vector<std::string>>
      hash_ckpt_;
  std::atomic<uint64_t> current_stable_seq_;
  std::mutex mutex_;
  LockFreeQueue<Request> data_queue_;
  std::mutex cv_mutex_;
  std::condition_variable cv_;
  std::function<void()> timeout_handler_;
  StableCheckPoint stable_ckpt_;
  int new_data_ = 0;
  LockFreeQueue<std::pair<uint64_t, std::string>> stable_hash_queue_;
  std::condition_variable signal_;
  ResDBTxnAccessor txn_accessor_;
  std::mutex lt_mutex_;
  uint64_t last_seq_ = 0;
  TransactionExecutor* executor_;
  std::atomic<uint64_t> highest_prepared_seq_;
  uint64_t committable_seq_ = 0;
  std::string last_hash_, committable_hash_;
  sem_t committable_seq_signal_;
};
 
}  // namespace resdb