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const EventEmitter = require('events')
const EthQuery = require('ethjs-query')
/*
Utility class for tracking the transactions as they
go from a pending state to a confirmed (mined in a block) state
As well as continues broadcast while in the pending state
~config is not optional~
requires a: {
provider: //,
nonceTracker: //see nonce tracker,
getPendingTransactions: //() a function for getting an array of transactions,
publishTransaction: //(rawTx) a async function for publishing raw transactions,
}
*/
module.exports = class PendingTransactionTracker extends EventEmitter {
constructor (config) {
super()
this.query = new EthQuery(config.provider)
this.nonceTracker = config.nonceTracker
// default is one day
this.retryTimePeriod = config.retryTimePeriod || 86400000
this.getPendingTransactions = config.getPendingTransactions
this.getCompletedTransactions = config.getCompletedTransactions
this.publishTransaction = config.publishTransaction
this._checkPendingTxs()
}
// checks if a signed tx is in a block and
// if included sets the tx status as 'confirmed'
checkForTxInBlock (block) {
const signedTxList = this.getPendingTransactions()
if (!signedTxList.length) return
signedTxList.forEach((txMeta) => {
const txHash = txMeta.hash
const txId = txMeta.id
if (!txHash) {
const noTxHashErr = new Error('We had an error while submitting this transaction, please try again.')
noTxHashErr.name = 'NoTxHashError'
this.emit('tx:failed', txId, noTxHashErr)
return
}
block.transactions.forEach((tx) => {
if (tx.hash === txHash) this.emit('tx:confirmed', txId)
})
})
}
queryPendingTxs ({ oldBlock, newBlock }) {
// check pending transactions on start
if (!oldBlock) {
this._checkPendingTxs()
return
}
// if we synced by more than one block, check for missed pending transactions
const diff = Number.parseInt(newBlock.number, 16) - Number.parseInt(oldBlock.number, 16)
if (diff > 1) this._checkPendingTxs()
}
resubmitPendingTxs (block) {
const pending = this.getPendingTransactions()
// only try resubmitting if their are transactions to resubmit
if (!pending.length) return
pending.forEach((txMeta) => this._resubmitTx(txMeta, block.number).catch((err) => {
/*
Dont marked as failed if the error is a "known" transaction warning
"there is already a transaction with the same sender-nonce
but higher/same gas price"
Also don't mark as failed if it has ever been broadcast successfully.
A successful broadcast means it may still be mined.
*/
const errorMessage = err.message.toLowerCase()
const isKnownTx = (
// geth
errorMessage.includes('replacement transaction underpriced') ||
errorMessage.includes('known transaction') ||
// parity
errorMessage.includes('gas price too low to replace') ||
errorMessage.includes('transaction with the same hash was already imported') ||
// other
errorMessage.includes('gateway timeout') ||
errorMessage.includes('nonce too low')
)
// ignore resubmit warnings, return early
if (isKnownTx) return
// encountered real error - transition to error state
txMeta.warning = {
error: errorMessage,
message: 'There was an error when resubmitting this transaction.',
}
this.emit('tx:warning', txMeta, err)
}))
}
async _resubmitTx (txMeta, latestBlockNumber) {
if (!txMeta.firstRetryBlockNumber) {
this.emit('tx:block-update', txMeta, latestBlockNumber)
}
if (Date.now() > txMeta.time + this.retryTimePeriod) {
const hours = (this.retryTimePeriod / 3.6e+6).toFixed(1)
const err = new Error(`Gave up submitting after ${hours} hours.`)
return this.emit('tx:failed', txMeta.id, err)
}
const firstRetryBlockNumber = txMeta.firstRetryBlockNumber || latestBlockNumber
const txBlockDistance = Number.parseInt(latestBlockNumber, 16) - Number.parseInt(firstRetryBlockNumber, 16)
const retryCount = txMeta.retryCount || 0
// Exponential backoff to limit retries at publishing
if (txBlockDistance <= Math.pow(2, retryCount) - 1) return
// Only auto-submit already-signed txs:
if (!('rawTx' in txMeta)) return
const rawTx = txMeta.rawTx
const txHash = await this.publishTransaction(rawTx)
// Increment successful tries:
this.emit('tx:retry', txMeta)
return txHash
}
async _checkPendingTx (txMeta) {
const txHash = txMeta.hash
const txId = txMeta.id
// extra check in case there was an uncaught error during the
// signature and submission process
if (!txHash) {
const noTxHashErr = new Error('We had an error while submitting this transaction, please try again.')
noTxHashErr.name = 'NoTxHashError'
this.emit('tx:failed', txId, noTxHashErr)
return
}
// If another tx with the same nonce is mined, set as failed.
const taken = await this._checkIfNonceIsTaken(txMeta)
if (taken) {
const nonceTakenErr = new Error('Another transaction with this nonce has been mined.')
nonceTakenErr.name = 'NonceTakenErr'
return this.emit('tx:failed', txId, nonceTakenErr)
}
// get latest transaction status
let txParams
try {
txParams = await this.query.getTransactionByHash(txHash)
if (!txParams) return
if (txParams.blockNumber) {
this.emit('tx:confirmed', txId)
}
} catch (err) {
txMeta.warning = {
error: err.message,
message: 'There was a problem loading this transaction.',
}
this.emit('tx:warning', txMeta, err)
}
}
// checks the network for signed txs and
// if confirmed sets the tx status as 'confirmed'
async _checkPendingTxs () {
const signedTxList = this.getPendingTransactions()
// in order to keep the nonceTracker accurate we block it while updating pending transactions
const nonceGlobalLock = await this.nonceTracker.getGlobalLock()
try {
await Promise.all(signedTxList.map((txMeta) => this._checkPendingTx(txMeta)))
} catch (err) {
console.error('PendingTransactionWatcher - Error updating pending transactions')
console.error(err)
}
nonceGlobalLock.releaseLock()
}
async _checkIfNonceIsTaken (txMeta) {
const completed = this.getCompletedTransactions()
const sameNonce = completed.filter((otherMeta) => {
return otherMeta.txParams.nonce === txMeta.txParams.nonce
})
return sameNonce.length > 0
}
}
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