ton/tonlib/tonlib/LastBlock.cpp

/*
    This file is part of TON Blockchain Library.

    TON Blockchain Library is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    TON Blockchain Library 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 Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with TON Blockchain Library.  If not, see <http://www.gnu.org/licenses/>.

    Copyright 2017-2019 Telegram Systems LLP
*/
#include "tonlib/LastBlock.h"

#include "ton/lite-tl.hpp"

#include "lite-client/lite-client-common.h"

namespace tonlib {

td::StringBuilder& operator<<(td::StringBuilder& sb, const LastBlockState& state) {
  return sb << td::tag("last_block", state.last_block_id.to_str())
            << td::tag("last_key_block", state.last_key_block_id.to_str()) << td::tag("utime", state.utime);
}

LastBlock::LastBlock(ExtClientRef client, LastBlockState state, td::unique_ptr<Callback> callback)
    : state_(std::move(state)), callback_(std::move(callback)) {
  client_.set_client(client);
}

void LastBlock::get_last_block(td::Promise<LastBlockState> promise) {
  if (promises_.empty()) {
    total_sync_ = td::Timer();
    validate_ = td::Timer(true);
    queries_ = 0;
    LOG(INFO) << "Begin last block synchronization " << state_;
    do_get_last_block();
  }
  promises_.push_back(std::move(promise));
}

void LastBlock::do_get_last_block() {
  //client_.send_query(ton::lite_api::liteServer_getMasterchainInfo(),
  //[this](auto r_info) { this->on_masterchain_info(std::move(r_info)); });
  //return;

  //liteServer.getBlockProof mode:# known_block:tonNode.blockIdExt target_block:mode.0?tonNode.blockIdExt = liteServer.PartialBlockProof;
  queries_++;
  client_.send_query(
      ton::lite_api::liteServer_getBlockProof(0, create_tl_lite_block_id(state_.last_key_block_id), nullptr),
      [this, from = state_.last_key_block_id](auto r_block_proof) {
        this->on_block_proof(from, std::move(r_block_proof));
      });
}

td::Result<bool> LastBlock::process_block_proof(
    ton::BlockIdExt from,
    td::Result<ton::ton_api::object_ptr<ton::lite_api::liteServer_partialBlockProof>> r_block_proof) {
  validate_.resume();
  SCOPE_EXIT {
    validate_.pause();
  };

  TRY_RESULT(block_proof, std::move(r_block_proof));
  LOG(DEBUG) << "Got proof FROM\n" << to_string(block_proof->from_) << "TO\n" << to_string(block_proof->to_);
  TRY_RESULT(chain, liteclient::deserialize_proof_chain(std::move(block_proof)));
  if (chain->from != from) {
    return td::Status::Error(PSLICE() << "block proof chain starts from block " << chain->from.to_str()
                                      << ", not from requested block " << from.to_str());
  }
  TRY_STATUS(chain->validate());
  bool is_changed = false;
  is_changed |= update_mc_last_block(chain->to);
  if (chain->has_key_block) {
    is_changed |= update_mc_last_key_block(chain->key_blkid);
  }
  if (chain->has_utime) {
    update_utime(chain->last_utime);
  }
  if (is_changed) {
    callback_->on_state_changed(state_);
  }
  return chain->complete;
}

void LastBlock::on_block_proof(
    ton::BlockIdExt from,
    td::Result<ton::ton_api::object_ptr<ton::lite_api::liteServer_partialBlockProof>> r_block_proof) {
  auto r_is_ready = process_block_proof(from, std::move(r_block_proof));
  bool is_ready;
  if (r_is_ready.is_error()) {
    LOG(WARNING) << "Error during last block synchronization " << r_is_ready.error();
    is_ready = true;
  } else {
    is_ready = r_is_ready.move_as_ok();
  }
  if (is_ready) {
    LOG(INFO) << "End last block synchronization " << state_ << "\n"
              << "   net queries: " << queries_ << "\n"
              << "   total: " << total_sync_ << " validation: " << validate_;
    for (auto& promise : promises_) {
      auto state = state_;
      promise.set_value(std::move(state));
    }
    promises_.clear();
  } else {
    do_get_last_block();
  }
}

void LastBlock::on_masterchain_info(
    td::Result<ton::ton_api::object_ptr<ton::lite_api::liteServer_masterchainInfo>> r_info) {
  if (r_info.is_ok()) {
    auto info = r_info.move_as_ok();
    update_zero_state(create_zero_state_id(info->init_));
    update_mc_last_block(create_block_id(info->last_));
  } else {
    LOG(WARNING) << "Failed liteServer_getMasterchainInfo " << r_info.error();
  }
  for (auto& promise : promises_) {
    auto state = state_;
    promise.set_value(std::move(state));
  }
  promises_.clear();
}

void LastBlock::update_zero_state(ton::ZeroStateIdExt zero_state_id) {
  if (!zero_state_id.is_valid()) {
    LOG(ERROR) << "Ignore invalid zero state update";
    return;
  }

  if (!state_.zero_state_id.is_valid()) {
    LOG(INFO) << "Init zerostate: " << zero_state_id.to_str();
    state_.zero_state_id = std::move(zero_state_id);
    return;
  }

  if (state_.zero_state_id == state_.zero_state_id) {
    return;
  }

  LOG(FATAL) << "Masterchain zerostate mismatch: expected: " << state_.zero_state_id.to_str() << ", found "
             << zero_state_id.to_str();
  // TODO: all other updates will be inconsitent.
  // One will have to restart ton client
}

bool LastBlock::update_mc_last_block(ton::BlockIdExt mc_block_id) {
  if (!mc_block_id.is_valid()) {
    LOG(ERROR) << "Ignore invalid masterchain block";
    return false;
  }
  if (!state_.last_block_id.is_valid() || state_.last_block_id.id.seqno < mc_block_id.id.seqno) {
    state_.last_block_id = mc_block_id;
    LOG(INFO) << "Update masterchain block id: " << state_.last_block_id.to_str();
    return true;
  }
  return false;
}

bool LastBlock::update_mc_last_key_block(ton::BlockIdExt mc_key_block_id) {
  if (!mc_key_block_id.is_valid()) {
    LOG(ERROR) << "Ignore invalid masterchain block";
    return false;
  }
  if (!state_.last_key_block_id.is_valid() || state_.last_key_block_id.id.seqno < mc_key_block_id.id.seqno) {
    state_.last_key_block_id = mc_key_block_id;
    LOG(INFO) << "Update masterchain key block id: " << state_.last_key_block_id.to_str();
    return true;
  }
  return false;
}

void LastBlock::update_utime(td::int64 utime) {
  if (state_.utime < utime) {
    state_.utime = utime;
  }
}
}  // namespace tonlib