# All files / src bridgeState.js

70.54% Statements 79/112
38.46% Branches 10/26
70% Functions 14/20
70.64% Lines 77/109

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     /**
     * Copyright (c) 2018-present, Leap DAO (leapdao.org)
     *
     * This source code is licensed under the Mozilla Public License Version 2.0
     * found in the LICENSE file in the root directory of this source tree.
     */

    const Web3 = require('web3');
    const TinyQueue = require('tinyqueue');
    const { Period, Block, Outpoint } = require('leap-core');
    const ContractsEventsSubscription = require('./utils/ContractsEventsSubscription');
    const { handleEvents } = require('./utils');
    const { GENESIS } = require('./utils/constants');
    const { logNode } = require('./utils/debug');

    const bridgeABI = require('./abis/bridgeAbi');
    const exitABI = require('./abis/exitHandler');
    const singleOperatorABI = require('./abis/singleOperator');
    let operatorABI = require('./abis/operator');
    const proxyABI = require('./abis/proxy');
    const { NFT_COLOR_BASE, NST_COLOR_BASE } = require('./api/methods/constants');

    module.exports = class BridgeState {
      constructor(db, privKey, config, relayBuffer) {
        this.config = config;
        this.web3 = new Web3(config.rootNetwork);

        this.exitHandlerContract = new this.web3.eth.Contract(
          exitABI.concat(proxyABI),
          config.exitHandlerAddr
        );
        this.bridgeContract = new this.web3.eth.Contract(
          bridgeABI.concat(proxyABI),
          config.bridgeAddr
        );
        // if theta mainnet or theta testnet, use old operator ABI
        Iif (
          config.rootNetworkId === 448747062 ||
          config.rootNetworkId === 218508104
        ) {
          operatorABI = singleOperatorABI;
        }
        this.operatorContract = new this.web3.eth.Contract(
          operatorABI.concat(proxyABI),
          config.operatorAddr
        );

        this.account = privKey
          ? this.web3.eth.accounts.privateKeyToAccount(privKey)
          : this.web3.eth.accounts.create();

        this.db = db;
        this.blockHeight = 0;
        this.currentState = null;
        this.networkId = config.networkId;
        this.currentPeriod = new Period(GENESIS);
        this.previousPeriod = null;
        this.deposits = {};
        this.exits = {};
        this.tokens = {
          erc20: [],
          erc721: [],
          erc1948: [],
        };
        this.epochLengths = [];
        this.minGasPrices = [];

        this.onNewBlock = this.onNewBlock.bind(this);
        this.eventsBuffer = new TinyQueue([], (a, b) => {
          if (a.blockNumber === b.blockNumber) {
            return a.logIndex - b.logIndex;
          }
          return a.blockNumber - b.blockNumber;
        });
        this.bridgeDelay = config.bridgeDelay;
        this.relayBuffer = relayBuffer;
        this.logsCache = {};
        this.submissions = [];
        this.periodHeights = {};
        this.submittedPeriods = {};
        this.exitingUtxos = {};

        this.handleEvents = handleEvents({
          NewDeposit: ({ returnValues: event }) => {
            this.deposits[event.depositId] = {
              depositor: event.depositor,
              color: event.color,
              amount: event.amount,
            };
          },
          NewDepositV2: ({ returnValues: event }) => {
            this.deposits[event.depositId] = {
              depositor: event.depositor,
              color: event.color,
              amount: event.amount,
              data: event.data,
            };
          },
          ExitStarted: ({ returnValues: event }) => {
            const outpoint = new Outpoint(event.txHash, Number(event.outIndex));
            this.exits[outpoint.getUtxoId()] = {
              txHash: event.txHash,
              outIndex: Number(event.outIndex),
              exitor: event.exitor,
              color: event.color,
              amount: event.amount,
            };
          },
          ExitStartedV2: ({ returnValues: event }) => {
            const outpoint = new Outpoint(event.txHash, Number(event.outIndex));
            this.exits[outpoint.getUtxoId()] = {
              txHash: event.txHash,
              outIndex: Number(event.outIndex),
              exitor: event.exitor,
              color: event.color,
              amount: event.amount,
              data: event.data,
            };
          },
          NewToken: ({ returnValues: event }) => {
            let array = this.tokens.erc20;

            if (event.color >= NST_COLOR_BASE) {
              array = this.tokens.erc1948;
            } else if (event.color >= NFT_COLOR_BASE) {
              array = this.tokens.erc721;
            }

            if (array.indexOf(event.tokenAddr) === -1) {
              array.push(event.tokenAddr);
            }
          },
          EpochLength: event => {
            const { blockNumber, returnValues } = event;
            this.epochLengths.push([
              Number(returnValues.epochLength),
              Number(blockNumber),
            ]);
          },
          MinGasPrice: ({ returnValues: event }) => {
            this.minGasPrices.push(Number(event.minGasPrice));
          },
          Submission: ({ returnValues: event }) => {
            this.lastBlocksRoot = event.blocksRoot;
            this.lastPeriodRoot = event.periodRoot;
            this.submittedPeriods[this.lastBlocksRoot] = true;
            const blockHeight = this.periodHeights[this.lastBlocksRoot] - 1;
            const [periodStart] = Period.periodBlockRange(blockHeight);
            this.submissions.push({
              periodStart,
              casBitmap: event.casBitmap,
              slotId: event.slotId,
              validatorAddress: event.owner,
            });
          },
        });

        this.handleExitingUtxos = handleEvents({
          ExitStarted: ({ returnValues: event }) => {
            const outpoint = new Outpoint(event.txHash, Number(event.outIndex));
            this.exitingUtxos[outpoint.hex()] = {
              txHash: event.txHash,
              outIndex: Number(event.outIndex),
              exitor: event.exitor,
              color: event.color,
              amount: event.amount,
            };
          },
        });
      }

      async init() {
        logNode('Syncing events...');
        this.lastBlockSynced = await this.db.getLastBlockSynced();
        const genesisBlock = await this.bridgeContract.methods
          .genesisBlockNumber()
          .call();
        const contracts = [
          this.operatorContract,
          this.bridgeContract,
          this.exitHandlerContract,
        ];
        this.eventsSubscription = new ContractsEventsSubscription(
          this.web3,
          contracts,
          this.eventsBuffer,
          parseInt(genesisBlock, 10)
        );
        const blockNumber = await this.web3.eth.getBlockNumber();
        await this.eventsSubscription.init();
        await this.onNewBlock(blockNumber);
        await this.initBlocks();

        Iif (this.lastBlocksRoot && this.lastPeriodRoot) {
          this.currentPeriod = new Period(this.lastBlocksRoot);
        }

        this.exitEventSubscription = new ContractsEventsSubscription(
          this.web3,
          [this.exitHandlerContract],
          [],
          blockNumber - this.bridgeDelay,
          'ExitStarted'
        );
        this.exitEventSubscription.on('newEvents', this.handleExitingUtxos);
        this.exitEventSubscription.init();

        logNode('Synced');
      }

      async initBlocks() {
        const blockOptions = {
          timestamp: Math.round(Date.now() / 1000),
        };
        const blocks = [new Block(0, blockOptions), new Block(1, blockOptions)];

        blocks.forEach(b => this.currentPeriod.addBlock(b));
        await Promise.all(blocks.map(b => this.db.storeBlock(b)));
      }

      async onNewBlock(blockNumber) {
        Eif (this.eventsBuffer.length === 0) {
          return;
        }

        const events = [];

        while (
          this.eventsBuffer.peek().blockNumber <=
          blockNumber - this.bridgeDelay
        ) {
          const event = this.eventsBuffer.pop();

          events.push(event);

          if (this.eventsBuffer.length === 0) {
            break;
          }
        }

        await this.handleEvents(events);

        // now push to second buffer
        for (const event of events) {
          this.relayBuffer.push(event);
        }
      }

      async saveSubmissions() {
        if (!this.submissions.length) return;
        this.db.storePeriods(this.submissions).then(() => {
          this.submissions = [];
        });
      }

      async saveState() {
        this.currentState.blockHeight = this.blockHeight;
        this.db.storeChainState(this.currentState);
      }

      async loadState() {
        const res = await this.db.getChainState();
        this.currentState = res || {
          blockHeight: 0,
          mempool: [],
          balances: {}, // stores account balances like this { [colorIndex]: { address1: 0, ... } }
          owners: {}, // index for NFT ownerOf call
          unspent: {}, // stores unspent outputs (deposits, transfers)
          processedDeposit: 0,
          slots: [],
          epoch: {
            epoch: 0,
            lastEpochHeight: 0,
            epochLength: null,
            epochLengthIndex: -1,
          },
          gas: {
            minPrice: 0,
            minPriceIndex: -1,
          },
        };

        return this.currentState;
      }
    };