tokenbridge/monitor/utils/bridgeMode.js

const HOME_NATIVE_TO_ERC_ABI = require('../../contracts/build/contracts/HomeBridgeNativeToErc').abi
const FOREIGN_NATIVE_TO_ERC_ABI = require('../../contracts/build/contracts/ForeignBridgeNativeToErc')
  .abi
const HOME_ERC_TO_ERC_ABI = require('../../contracts/build/contracts/HomeBridgeErcToErc').abi
const FOREIGN_ERC_TO_ERC_ABI = require('../../contracts/build/contracts/ForeignBridgeErc677ToErc677')
  .abi
const HOME_ERC_TO_NATIVE_ABI = require('../../contracts/build/contracts/HomeBridgeErcToNative').abi
const FOREIGN_ERC_TO_NATIVE_ABI = require('../../contracts/build/contracts/ForeignBridgeErcToNative')
  .abi

const { homeV1Abi, foreignViAbi } = require('./v1Abis')

const BRIDGE_MODES = {
  NATIVE_TO_ERC: 'NATIVE_TO_ERC',
  ERC_TO_ERC: 'ERC_TO_ERC',
  ERC_TO_NATIVE: 'ERC_TO_NATIVE',
  NATIVE_TO_ERC_V1: 'NATIVE_TO_ERC_V1'
}

const ERC_TYPES = {
  ERC20: 'ERC20',
  ERC677: 'ERC677'
}

function getBridgeABIs(bridgeMode) {
  let HOME_ABI = null
  let FOREIGN_ABI = null
  if (bridgeMode === BRIDGE_MODES.NATIVE_TO_ERC) {
    HOME_ABI = HOME_NATIVE_TO_ERC_ABI
    FOREIGN_ABI = FOREIGN_NATIVE_TO_ERC_ABI
  } else if (bridgeMode === BRIDGE_MODES.ERC_TO_ERC) {
    HOME_ABI = HOME_ERC_TO_ERC_ABI
    FOREIGN_ABI = FOREIGN_ERC_TO_ERC_ABI
  } else if (bridgeMode === BRIDGE_MODES.ERC_TO_NATIVE) {
    HOME_ABI = HOME_ERC_TO_NATIVE_ABI
    FOREIGN_ABI = FOREIGN_ERC_TO_NATIVE_ABI
  } else if (bridgeMode === BRIDGE_MODES.NATIVE_TO_ERC_V1) {
    HOME_ABI = homeV1Abi
    FOREIGN_ABI = foreignViAbi
  } else {
    throw new Error(`Unrecognized bridge mode: ${bridgeMode}`)
  }

  return { HOME_ABI, FOREIGN_ABI }
}

function decodeBridgeMode(bridgeModeHash) {
  switch (bridgeModeHash) {
    case '0x92a8d7fe':
      return BRIDGE_MODES.NATIVE_TO_ERC
    case '0xba4690f5':
      return BRIDGE_MODES.ERC_TO_ERC
    case '0x18762d46':
      return BRIDGE_MODES.ERC_TO_NATIVE
    default:
      throw new Error(`Unrecognized bridge mode hash: '${bridgeModeHash}'`)
  }
}

async function getBridgeMode(contract) {
  try {
    const bridgeModeHash = await contract.methods.getBridgeMode().call()
    return decodeBridgeMode(bridgeModeHash)
  } catch (e) {
    return BRIDGE_MODES.NATIVE_TO_ERC_V1
  }
}

module.exports = {
  getBridgeABIs,
  getBridgeMode,
  BRIDGE_MODES,
  ERC_TYPES
}