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Catch zero balance error in swap tokens worker

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This commit is contained in:
Gerardo Nardelli 2019-12-03 14:07:17 -03:00
parent a4eb446f7b
commit 5583ea8b6b
1 changed files with 20 additions and 1 deletions
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21
oracle/src/workers/swapTokens.js
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@ -3,9 +3,10 @@ const { HttpListProviderError } = require('http-list-provider')
const rootLogger = require('../services/logger')
const { web3Foreign } = require('../services/web3')
const { BRIDGE_VALIDATORS_ABI } = require('../../../commons')
const { BRIDGE_VALIDATORS_ABI, ERC20_ABI } = require('../../../commons')
let validatorContract = null
let halfDuplexTokenContract = null
function swapTokensBuilder(config) {
const foreignBridge = new web3Foreign.eth.Contract(config.foreignBridgeAbi, config.foreignBridgeAddress)
@ -69,6 +70,24 @@ function swapTokensBuilder(config) {
logger.error(e, errorMsg)
throw new Error(errorMsg)
} else {
if (halfDuplexTokenContract === null) {
logger.debug('Getting half duplex token contract address')
const halfDuplexErc20Token = await foreignBridge.methods.halfDuplexErc20token().call()
logger.debug({ halfDuplexErc20Token }, 'Half duplex token contract address obtained')
halfDuplexTokenContract = new web3Foreign.eth.Contract(ERC20_ABI, halfDuplexErc20Token)
}
const balance = web3Foreign.utils.toBN(
await halfDuplexTokenContract.methods.balanceOf(config.foreignBridgeAddress).call()
)
logger.debug({ balance: balance.toString() }, 'Half duplex token bridge balance obtained')
if (balance.isZero()) {
logger.info(`Gas estimate failed because half duplex balance is zero. Token swap is discarded.`)
return txToSend
}
logger.error(e, 'Unknown error while processing transaction')
throw e
}