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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
this.retryLimit = config.retryLimit || Infinity
this.getPendingTransactions = config.getPendingTransactions
this.publishTransaction = config.publishTransaction
}
// 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 () {
const pending = this.getPendingTransactions()
// only try resubmitting if their are transactions to resubmit
if (!pending.length) return
pending.forEach((txMeta) => this._resubmitTx(txMeta).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) {
if (txMeta.retryCount > this.retryLimit) {
const err = new Error(`Gave up submitting after ${this.retryLimit} blocks un-mined.`)
return this.emit('tx:failed', txMeta.id, err)
}
// 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
}
// 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: '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()
}
}
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