358 lines
11 KiB
JavaScript
358 lines
11 KiB
JavaScript
const ethers = require('ethers')
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const { parseUnits, formatUnits } = ethers.utils
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const BigNumber = ethers.BigNumber
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const PromiEvent = require('web3-core-promievent')
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const { sleep, min, max } = require('./utils')
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// prettier-ignore
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const nonceErrors = [
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'Transaction nonce is too low. Try incrementing the nonce.',
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'nonce too low'
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]
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const gasPriceErrors = [
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'Transaction gas price supplied is too low. There is another transaction with same nonce in the queue. Try increasing the gas price or incrementing the nonce.',
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'replacement transaction underpriced',
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/Transaction gas price \d+wei is too low. There is another transaction with same nonce in the queue with gas price: \d+wei. Try increasing the gas price or incrementing the nonce./,
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]
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// prettier-ignore
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const sameTxErrors = [
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'Transaction with the same hash was already imported.',
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]
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class Transaction {
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constructor(tx, manager) {
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Object.assign(this, manager)
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this.manager = manager
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this.tx = { ...tx }
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this._promise = PromiEvent()
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this._emitter = this._promise.eventEmitter
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this.executed = false
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this.retries = 0
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this.currentTxHash = null
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// store all submitted hashes to catch cases when an old tx is mined
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this.hashes = []
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}
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/**
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* Submits the transaction to Ethereum network. Resolves when tx gets enough confirmations.
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* Emits progress events.
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*/
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send() {
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if (this.executed) {
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throw new Error('The transaction was already executed')
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}
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this.executed = true
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this._execute().then(this._promise.resolve).catch(this._promise.reject)
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return this._emitter
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}
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/**
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* Replaces a pending tx.
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*
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* @param tx Transaction to send
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*/
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async replace(tx) {
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// todo throw error if the current transaction is mined already
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console.log('Replacing current transaction')
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if (!this.executed) {
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// Tx was not executed yet, just replace it
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this.tx = { ...tx }
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return
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}
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if (!tx.gasLimit) {
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tx.gasLimit = await this._wallet.estimateGas(tx)
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tx.gasLimit = Math.floor(tx.gasLimit * this.config.GAS_LIMIT_MULTIPLIER)
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}
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tx.nonce = this.tx.nonce // can be different from `this.manager._nonce`
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tx.gasPrice = Math.max(this.tx.gasPrice, tx.gasPrice || 0) // start no less than current tx gas price
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this.tx = { ...tx }
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this._increaseGasPrice()
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await this._send()
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}
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/**
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* Cancels a pending tx.
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*/
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cancel() {
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console.log('Canceling the transaction')
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return this.replace({
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from: this.address,
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to: this.address,
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value: 0,
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gasLimit: 21000,
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})
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}
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/**
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* Executes the transaction. Acquires global mutex for transaction duration
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*
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* @returns {Promise<TransactionReceipt>}
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* @private
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*/
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async _execute() {
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await this.manager._mutex.acquire()
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try {
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await this._prepare()
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await this._send()
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const receipt = this._waitForConfirmations()
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// we could have bumped nonce during execution, so get the latest one + 1
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this.manager._nonce = this.tx.nonce + 1
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return receipt
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} finally {
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this.manager._mutex.release()
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}
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}
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/**
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* Prepare first transaction before submitting it. Inits `gas`, `gasPrice`, `nonce`
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*
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* @returns {Promise<void>}
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* @private
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*/
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async _prepare() {
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if (!this.tx.gasLimit || this.config.ESTIMATE_GAS) {
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const gas = await this._wallet.estimateGas(this.tx)
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if (!this.tx.gasLimit) {
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this.tx.gasLimit = Math.floor(gas * this.config.GAS_LIMIT_MULTIPLIER)
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}
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}
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if (!this.tx.gasPrice) {
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this.tx.gasPrice = await this._getGasPrice('fast')
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}
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if (!this.manager._nonce) {
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this.manager._nonce = await this._getLastNonce()
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}
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this.tx.nonce = this.manager._nonce
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if (!this.manager._chainId) {
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const net = await this._provider.getNetwork()
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this.manager._chainId = net.chainId
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}
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this.tx.chainId = this.manager._chainId
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}
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/**
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* Send the current transaction
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*
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* @returns {Promise}
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* @private
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*/
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async _send() {
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// todo throw is we attempt to send a tx that attempts to replace already mined tx
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const signedTx = await this._wallet.signTransaction(this.tx)
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this.submitTimestamp = Date.now()
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const txHash = ethers.utils.keccak256(signedTx)
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this.hashes.push(txHash)
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try {
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await this._broadcast(signedTx)
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} catch (e) {
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return this._handleSendError(e)
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}
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this._emitter.emit('transactionHash', txHash)
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console.log(`Broadcasted transaction ${txHash}`)
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}
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/**
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* A loop that waits until the current transaction is mined and gets enough confirmations
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*
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* @returns {Promise<TransactionReceipt>} The transaction receipt
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* @private
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*/
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async _waitForConfirmations() {
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// eslint-disable-next-line no-constant-condition
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while (true) {
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// We are already waiting on certain tx hash
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if (this.currentTxHash) {
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const receipt = await this._provider.getTransactionReceipt(this.currentTxHash)
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if (!receipt) {
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// We were waiting for some tx but it disappeared
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// Erase the hash and start over
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this.currentTxHash = null
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continue
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}
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const currentBlock = await this._provider.getBlockNumber()
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const confirmations = Math.max(0, currentBlock - receipt.blockNumber)
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// todo don't emit repeating confirmation count
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this._emitter.emit('confirmations', confirmations)
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if (confirmations >= this.config.CONFIRMATIONS) {
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// Tx is mined and has enough confirmations
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return receipt
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}
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// Tx is mined but doesn't have enough confirmations yet, keep waiting
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await sleep(this.config.POLL_INTERVAL)
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continue
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}
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// Tx is still pending
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if ((await this._getLastNonce()) <= this.tx.nonce) {
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// todo optionally run estimateGas on each iteration and cancel the transaction if it fails
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// We were waiting too long, increase gas price and resubmit
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if (Date.now() - this.submitTimestamp >= this.config.GAS_BUMP_INTERVAL) {
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if (this._increaseGasPrice()) {
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console.log('Resubmitting with higher gas price')
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await this._send()
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continue
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}
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}
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// Tx is still pending, keep waiting
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await sleep(this.config.POLL_INTERVAL)
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continue
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}
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// There is a mined tx with our nonce, let's see if it has a known hash
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let receipt = await this._getReceipts()
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// There is a mined tx with current nonce, but it's not one of ours
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// Probably other tx submitted by other process/client
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if (!receipt) {
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console.log("Can't find our transaction receipt, retrying a few times")
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// Give node a few more attempts to respond with our receipt
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let retries = 5
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while (!receipt && retries--) {
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await sleep(1000)
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receipt = await this._getReceipts()
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}
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// Receipt was not found after a few retries
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// Resubmit our tx
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if (!receipt) {
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console.log(
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'There is a mined tx with our nonce but unknown tx hash, resubmitting with tx with increased nonce',
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)
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this.tx.nonce++
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// todo drop gas price to original value?
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await this._send()
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continue
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}
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}
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console.log('Mined. Start waiting for confirmations...')
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this._emitter.emit('mined', receipt)
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this.currentTxHash = receipt.transactionHash
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}
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}
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async _getReceipts() {
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for (const hash of this.hashes.reverse()) {
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const receipt = await this._provider.getTransactionReceipt(hash)
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if (receipt) {
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return receipt
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}
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}
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return null
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}
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/**
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* Broadcasts tx to multiple nodes, waits for tx hash only on main node
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*/
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_broadcast(rawTx) {
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const main = this._provider.sendTransaction(rawTx)
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for (const node of this._broadcastNodes) {
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try {
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new ethers.providers.JsonRpcProvider(node).sendTransaction(rawTx)
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} catch (e) {
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console.log(`Failed to send transaction to node ${node}: ${e}`)
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}
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}
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return main
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}
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_handleSendError(e) {
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console.log('Got error', e)
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if (e.code === 'SERVER_ERROR' && e.error) {
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const message = e.error.message
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console.log('Error', e.error.code, e.error.message)
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// nonce is too low, trying to increase and resubmit
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if (this._hasError(message, nonceErrors)) {
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console.log(`Nonce ${this.tx.nonce} is too low, increasing and retrying`)
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if (this.retries <= this.config.MAX_RETRIES) {
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this.tx.nonce++
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this.retries++
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return this._send()
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}
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}
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// there is already a pending tx with higher gas price, trying to bump and resubmit
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if (this._hasError(message, gasPriceErrors)) {
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console.log(
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`Gas price ${formatUnits(this.tx.gasPrice, 'gwei')} gwei is too low, increasing and retrying`,
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)
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this._increaseGasPrice()
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return this._send()
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}
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if (this._hasError(message, sameTxErrors)) {
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console.log('Same transaction is already in mempool, skipping submit')
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return // do nothing
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}
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}
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throw new Error(`Send error: ${e}`)
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}
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/**
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* Returns whether error message is contained in errors array
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*
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* @param message The message to look up
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* @param {Array<string|RegExp>} errors Array with errors. Errors can be either string or regexp.
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* @returns {boolean} Returns true if error message is present in the `errors` array
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* @private
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*/
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_hasError(message, errors) {
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return errors.find(e => (typeof e === 'string' ? e === message : message.match(e))) !== undefined
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}
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_increaseGasPrice() {
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const minGweiBump = parseUnits(this.config.MIN_GWEI_BUMP.toString(), 'gwei')
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const oldGasPrice = BigNumber.from(this.tx.gasPrice)
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const newGasPrice = max(
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oldGasPrice.mul(100 + this.config.GAS_BUMP_PERCENTAGE).div(100),
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oldGasPrice.add(minGweiBump),
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)
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const maxGasPrice = parseUnits(this.config.MAX_GAS_PRICE.toString(), 'gwei')
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if (oldGasPrice.eq(maxGasPrice)) {
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console.log('Already at max gas price, not bumping')
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return false
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}
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this.tx.gasPrice = min(newGasPrice, maxGasPrice).toHexString()
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console.log(`Increasing gas price to ${formatUnits(this.tx.gasPrice, 'gwei')} gwei`)
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return true
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}
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/**
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* Fetches gas price from the oracle
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*
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* @param {'instant'|'fast'|'normal'|'slow'} type
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* @returns {Promise<string>} A hex string representing gas price in wei
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* @private
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*/
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async _getGasPrice(type) {
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const gasPrices = await this._gasPriceOracle.gasPrices()
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const result = gasPrices[type].toString()
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console.log(`${type} gas price is now ${result} gwei`)
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return parseUnits(result, 'gwei').toHexString()
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}
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/**
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* Gets current nonce for the current account, ignoring any pending transactions
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*
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* @returns {Promise<number>}
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* @private
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*/
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_getLastNonce() {
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return this._wallet.getTransactionCount('latest')
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}
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}
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module.exports = Transaction
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