const EventEmitter = require('events') const async = require('async') const extend = require('xtend') const ObservableStore = require('obs-store') const ethUtil = require('ethereumjs-util') const pify = require('pify') const TxProviderUtil = require('../lib/tx-utils') const createId = require('../lib/random-id') const NonceTracker = require('../lib/nonce-tracker') module.exports = class TransactionController extends EventEmitter { constructor (opts) { super() this.store = new ObservableStore(extend({ transactions: [], }, opts.initState)) this.memStore = new ObservableStore({}) this.networkStore = opts.networkStore || new ObservableStore({}) this.preferencesStore = opts.preferencesStore || new ObservableStore({}) this.txHistoryLimit = opts.txHistoryLimit this.provider = opts.provider this.blockTracker = opts.blockTracker this.nonceTracker = new NonceTracker({ provider: this.provider, blockTracker: this.provider._blockTracker, getPendingTransactions: (address) => { return this.getFilteredTxList({ from: address, status: 'submitted', err: undefined, }) }, }) this.query = opts.ethQuery this.txProviderUtils = new TxProviderUtil(this.query) this.blockTracker.on('rawBlock', this.checkForTxInBlock.bind(this)) // this is a little messy but until ethstore has been either // removed or redone this is to guard against the race condition // where ethStore hasent been populated by the results yet this.blockTracker.once('latest', () => this.blockTracker.on('latest', this.resubmitPendingTxs.bind(this))) this.blockTracker.on('sync', this.queryPendingTxs.bind(this)) this.signEthTx = opts.signTransaction this.ethStore = opts.ethStore // memstore is computed from a few different stores this._updateMemstore() this.store.subscribe(() => this._updateMemstore()) this.networkStore.subscribe(() => this._updateMemstore()) this.preferencesStore.subscribe(() => this._updateMemstore()) } getState () { return this.memStore.getState() } getNetwork () { return this.networkStore.getState() } getSelectedAddress () { return this.preferencesStore.getState().selectedAddress } // Returns the tx list getTxList () { const network = this.getNetwork() const fullTxList = this.getFullTxList() return fullTxList.filter(txMeta => txMeta.metamaskNetworkId === network) } // Returns the number of txs for the current network. getTxCount () { return this.getTxList().length } // Returns the full tx list across all networks getFullTxList () { return this.store.getState().transactions } // Adds a tx to the txlist addTx (txMeta) { const txCount = this.getTxCount() const network = this.getNetwork() const fullTxList = this.getFullTxList() const txHistoryLimit = this.txHistoryLimit // checks if the length of the tx history is // longer then desired persistence limit // and then if it is removes only confirmed // or rejected tx's. // not tx's that are pending or unapproved if (txCount > txHistoryLimit - 1) { var index = fullTxList.findIndex((metaTx) => ((metaTx.status === 'confirmed' || metaTx.status === 'rejected') && network === txMeta.metamaskNetworkId)) fullTxList.splice(index, 1) } fullTxList.push(txMeta) this._saveTxList(fullTxList) this.emit('update') this.once(`${txMeta.id}:signed`, function (txId) { this.removeAllListeners(`${txMeta.id}:rejected`) }) this.once(`${txMeta.id}:rejected`, function (txId) { this.removeAllListeners(`${txMeta.id}:signed`) }) this.emit('updateBadge') this.emit(`${txMeta.id}:unapproved`, txMeta) } // gets tx by Id and returns it getTx (txId, cb) { var txList = this.getTxList() var txMeta = txList.find(txData => txData.id === txId) return cb ? cb(txMeta) : txMeta } // updateTx (txMeta) { var txId = txMeta.id var txList = this.getFullTxList() var index = txList.findIndex(txData => txData.id === txId) txList[index] = txMeta this._saveTxList(txList) this.emit('update') } get unapprovedTxCount () { return Object.keys(this.getUnapprovedTxList()).length } get pendingTxCount () { return this.getTxsByMetaData('status', 'signed').length } addUnapprovedTransaction (txParams, done) { let txMeta async.waterfall([ // validate (cb) => this.txProviderUtils.validateTxParams(txParams, cb), // construct txMeta (cb) => { txMeta = { id: createId(), time: (new Date()).getTime(), status: 'unapproved', metamaskNetworkId: this.getNetwork(), txParams: txParams, } cb() }, // add default tx params (cb) => this.addTxDefaults(txMeta, cb), // save txMeta (cb) => { this.addTx(txMeta) cb(null, txMeta) }, ], done) } addTxDefaults (txMeta, cb) { const txParams = txMeta.txParams // ensure value txParams.value = txParams.value || '0x0' if (!txParams.gasPrice) { this.query.gasPrice((err, gasPrice) => { if (err) return cb(err) // set gasPrice txParams.gasPrice = gasPrice }) } // set gasLimit this.txProviderUtils.analyzeGasUsage(txMeta, cb) } getUnapprovedTxList () { var txList = this.getTxList() return txList.filter((txMeta) => txMeta.status === 'unapproved') .reduce((result, tx) => { result[tx.id] = tx return result }, {}) } async approveTransaction (txId) { let nonceLock try { // approve this.setTxStatusApproved(txId) // get next nonce const txMeta = this.getTx(txId) const fromAddress = txMeta.txParams.from nonceLock = await this.nonceTracker.getNonceLock(fromAddress) txMeta.txParams.nonce = nonceLock.nextNonce this.updateTx(txMeta) // sign transaction const rawTx = await this.signTransaction(txId) await this.publishTransaction(txId, rawTx) // must set transaction to submitted/failed before releasing lock nonceLock.releaseLock() } catch (err) { this.setTxStatusFailed(txId, { errCode: err.errCode || err, message: err.message || 'Transaction failed during approval', }) // must set transaction to submitted/failed before releasing lock if (nonceLock) nonceLock.releaseLock() // continue with error chain throw err } } cancelTransaction (txId, cb = warn) { this.setTxStatusRejected(txId) cb() } async updateAndApproveTransaction (txMeta) { this.updateTx(txMeta) await this.approveTransaction(txMeta.id) } getChainId () { const networkState = this.networkStore.getState() const getChainId = parseInt(networkState) if (Number.isNaN(getChainId)) { return 0 } else { return getChainId } } async signTransaction (txId) { const txMeta = this.getTx(txId) const txParams = txMeta.txParams const fromAddress = txParams.from // add network/chain id txParams.chainId = this.getChainId() const ethTx = this.txProviderUtils.buildEthTxFromParams(txParams) const rawTx = await this.signEthTx(ethTx, fromAddress).then(() => { this.setTxStatusSigned(txMeta.id) return ethUtil.bufferToHex(ethTx.serialize()) }) return rawTx } async publishTransaction (txId, rawTx) { const txMeta = this.getTx(txId) txMeta.rawTx = rawTx this.updateTx(txMeta) await this.txProviderUtils.publishTransaction(rawTx).then((txHash) => { this.setTxHash(txId, txHash) this.setTxStatusSubmitted(txId) }) } // receives a txHash records the tx as signed setTxHash (txId, txHash) { // Add the tx hash to the persisted meta-tx object const txMeta = this.getTx(txId) txMeta.hash = txHash this.updateTx(txMeta) } /* Takes an object of fields to search for eg: var thingsToLookFor = { to: '0x0..', from: '0x0..', status: 'signed', err: undefined, } and returns a list of tx with all options matching ****************HINT**************** | `err: undefined` is like looking | | for a tx with no err | | so you can also search txs that | | dont have something as well by | | setting the value as undefined | ************************************ this is for things like filtering a the tx list for only tx's from 1 account or for filltering for all txs from one account and that have been 'confirmed' */ getFilteredTxList (opts) { var filteredTxList Object.keys(opts).forEach((key) => { filteredTxList = this.getTxsByMetaData(key, opts[key], filteredTxList) }) return filteredTxList } getTxsByMetaData (key, value, txList = this.getTxList()) { return txList.filter((txMeta) => { if (txMeta.txParams[key]) { return txMeta.txParams[key] === value } else { return txMeta[key] === value } }) } // STATUS METHODS // get::set status // should return the status of the tx. getTxStatus (txId) { const txMeta = this.getTx(txId) return txMeta.status } // should update the status of the tx to 'rejected'. setTxStatusRejected (txId) { this._setTxStatus(txId, 'rejected') } // should update the status of the tx to 'approved'. setTxStatusApproved (txId) { this._setTxStatus(txId, 'approved') } // should update the status of the tx to 'signed'. setTxStatusSigned (txId) { this._setTxStatus(txId, 'signed') } // should update the status of the tx to 'submitted'. setTxStatusSubmitted (txId) { this._setTxStatus(txId, 'submitted') } // should update the status of the tx to 'confirmed'. setTxStatusConfirmed (txId) { this._setTxStatus(txId, 'confirmed') } setTxStatusFailed (txId, reason) { const txMeta = this.getTx(txId) txMeta.err = reason this.updateTx(txMeta) this._setTxStatus(txId, 'failed') } // merges txParams obj onto txData.txParams // use extend to ensure that all fields are filled updateTxParams (txId, txParams) { var txMeta = this.getTx(txId) txMeta.txParams = extend(txMeta.txParams, txParams) this.updateTx(txMeta) } // checks if a signed tx is in a block and // if included sets the tx status as 'confirmed' checkForTxInBlock (block) { var signedTxList = this.getFilteredTxList({status: 'submitted'}) if (!signedTxList.length) return signedTxList.forEach((txMeta) => { var txHash = txMeta.hash var txId = txMeta.id if (!txHash) { const errReason = { errCode: 'No hash was provided', message: 'We had an error while submitting this transaction, please try again.', } return this.setTxStatusFailed(txId, errReason) } block.transactions.forEach((tx) => { if (tx.hash === txHash) this.setTxStatusConfirmed(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) - Number.parseInt(oldBlock.number) if (diff > 1) this._checkPendingTxs() } // PRIVATE METHODS // Should find the tx in the tx list and // update it. // should set the status in txData // - `'unapproved'` the user has not responded // - `'rejected'` the user has responded no! // - `'approved'` the user has approved the tx // - `'signed'` the tx is signed // - `'submitted'` the tx is sent to a server // - `'confirmed'` the tx has been included in a block. // - `'failed'` the tx failed for some reason, included on tx data. _setTxStatus (txId, status) { var txMeta = this.getTx(txId) txMeta.status = status this.emit(`${txMeta.id}:${status}`, txId) if (status === 'submitted' || status === 'rejected') { this.emit(`${txMeta.id}:finished`, txMeta) } this.updateTx(txMeta) this.emit('updateBadge') } // Saves the new/updated txList. // Function is intended only for internal use _saveTxList (transactions) { this.store.updateState({ transactions }) } _updateMemstore () { const unapprovedTxs = this.getUnapprovedTxList() const selectedAddressTxList = this.getFilteredTxList({ from: this.getSelectedAddress(), metamaskNetworkId: this.getNetwork(), }) this.memStore.updateState({ unapprovedTxs, selectedAddressTxList }) } resubmitPendingTxs () { const pending = this.getTxsByMetaData('status', 'submitted') // 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" */ 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 this.setTxStatusFailed(txMeta.id, { errCode: err.errCode || err, message: err.message, }) })) } async _resubmitTx (txMeta, cb) { const address = txMeta.txParams.from const balance = this.ethStore.getState().accounts[address].balance if (!('retryCount' in txMeta)) txMeta.retryCount = 0 // if the value of the transaction is greater then the balance, fail. if (!this.txProviderUtils.sufficientBalance(txMeta.txParams, balance)) { const message = 'Insufficient balance.' this.setTxStatusFailed(txMeta.id, { message }) cb() return log.error(message) } // Only auto-submit already-signed txs: if (!('rawTx' in txMeta)) return cb() // Increment a try counter. txMeta.retryCount++ const rawTx = txMeta.rawTx return await this.txProviderUtils.publishTransaction(rawTx, cb) } // checks the network for signed txs and // if confirmed sets the tx status as 'confirmed' async _checkPendingTxs () { const signedTxList = this.getFilteredTxList({status: 'submitted'}) // 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('TransactionController - Error updating pending transactions') console.error(err) } nonceGlobalLock.releaseLock() } 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 errReason = { errCode: 'No hash was provided', message: 'We had an error while submitting this transaction, please try again.', } this.setTxStatusFailed(txId, errReason) return } // get latest transaction status let txParams try { txParams = await pify((cb) => this.query.getTransactionByHash(txHash, cb))() if (!txParams) return if (txParams.blockNumber) { this.setTxStatusConfirmed(txId) } } catch (err) { if (err || !txParams) { txMeta.err = { isWarning: true, errorCode: err, message: 'There was a problem loading this transaction.', } this.updateTx(txMeta) log.error(err) } } } } const warn = () => log.warn('warn was used no cb provided')