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417 lines
12 KiB
417 lines
12 KiB
const extend = require('xtend')
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const EventEmitter = require('events')
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const ObservableStore = require('obs-store')
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const ethUtil = require('ethereumjs-util')
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const txStateHistoryHelper = require('./lib/tx-state-history-helper')
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const createId = require('../../lib/random-id')
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const { getFinalStates } = require('./lib/util')
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/**
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TransactionStateManager is responsible for the state of a transaction and
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storing the transaction
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it also has some convenience methods for finding subsets of transactions
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*
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*STATUS METHODS
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<br>statuses:
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<br> - `'unapproved'` the user has not responded
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<br> - `'rejected'` the user has responded no!
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<br> - `'approved'` the user has approved the tx
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<br> - `'signed'` the tx is signed
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<br> - `'submitted'` the tx is sent to a server
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<br> - `'confirmed'` the tx has been included in a block.
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<br> - `'failed'` the tx failed for some reason, included on tx data.
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<br> - `'dropped'` the tx nonce was already used
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@param opts {object} -
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@property {object} opts.initState with the key transaction {array}
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@property {number} opts.txHistoryLimit limit for how many finished
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transactions can hang around in state
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@property {function} opts.getNetwork return network number
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@class
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*/
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class TransactionStateManager extends EventEmitter {
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constructor ({ initState, txHistoryLimit, getNetwork }) {
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super()
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this.store = new ObservableStore(
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extend({
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transactions: [],
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}, initState))
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this.txHistoryLimit = txHistoryLimit
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this.getNetwork = getNetwork
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}
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/**
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@param opts {object} - the object to use when overwriting defaults
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@returns {txMeta} the default txMeta object
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*/
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generateTxMeta (opts) {
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return extend({
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id: createId(),
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time: (new Date()).getTime(),
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status: 'unapproved',
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metamaskNetworkId: this.getNetwork(),
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loadingDefaults: true,
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}, opts)
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}
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/**
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@returns {array} of txMetas that have been filtered for only the current network
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*/
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getTxList () {
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const network = this.getNetwork()
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const fullTxList = this.getFullTxList()
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return fullTxList.filter((txMeta) => txMeta.metamaskNetworkId === network)
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}
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/**
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@returns {array} of all the txMetas in store
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*/
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getFullTxList () {
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return this.store.getState().transactions
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}
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/**
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@returns {array} the tx list whos status is unapproved
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*/
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getUnapprovedTxList () {
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const txList = this.getTxsByMetaData('status', 'unapproved')
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return txList.reduce((result, tx) => {
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result[tx.id] = tx
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return result
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}, {})
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}
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/**
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@param address {string} - hex prefixed address to sort the txMetas for [optional]
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@returns {array} the tx list whos status is submitted
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*/
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getPendingTransactions (address) {
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const opts = { status: 'submitted' }
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if (address) opts.from = address
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return this.getFilteredTxList(opts)
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}
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/**
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@param address {string} - hex prefixed address to sort the txMetas for [optional]
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@returns {array} the tx list whos status is confirmed
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*/
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getConfirmedTransactions (address) {
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const opts = { status: 'confirmed' }
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if (address) opts.from = address
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return this.getFilteredTxList(opts)
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}
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/**
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Adds the txMeta to the list of transactions in the store.
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if the list is over txHistoryLimit it will remove a transaction that
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is in its final state
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it will allso add the key `history` to the txMeta with the snap shot of the original
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object
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@param txMeta {object}
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@returns {object} the txMeta
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*/
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addTx (txMeta) {
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this.once(`${txMeta.id}:signed`, function (txId) {
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this.removeAllListeners(`${txMeta.id}:rejected`)
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})
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this.once(`${txMeta.id}:rejected`, function (txId) {
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this.removeAllListeners(`${txMeta.id}:signed`)
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})
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// initialize history
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txMeta.history = []
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// capture initial snapshot of txMeta for history
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const snapshot = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
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txMeta.history.push(snapshot)
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const transactions = this.getFullTxList()
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const txCount = transactions.length
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const txHistoryLimit = this.txHistoryLimit
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// checks if the length of the tx history is
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// longer then desired persistence limit
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// and then if it is removes only confirmed
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// or rejected tx's.
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// not tx's that are pending or unapproved
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if (txCount > txHistoryLimit - 1) {
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const index = transactions.findIndex((metaTx) => {
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return getFinalStates().includes(metaTx.status)
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})
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if (index !== -1) {
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transactions.splice(index, 1)
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}
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}
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transactions.push(txMeta)
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this._saveTxList(transactions)
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return txMeta
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}
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/**
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@param txId {number}
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@returns {object} the txMeta who matches the given id if none found
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for the network returns undefined
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*/
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getTx (txId) {
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const txMeta = this.getTxsByMetaData('id', txId)[0]
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return txMeta
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}
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/**
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updates the txMeta in the list and adds a history entry
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@param txMeta {object} - the txMeta to update
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@param note {string} - a not about the update for history
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*/
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updateTx (txMeta, note) {
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// validate txParams
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if (txMeta.txParams) {
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if (typeof txMeta.txParams.data === 'undefined') {
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delete txMeta.txParams.data
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}
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this.validateTxParams(txMeta.txParams)
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}
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// create txMeta snapshot for history
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const currentState = txStateHistoryHelper.snapshotFromTxMeta(txMeta)
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// recover previous tx state obj
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const previousState = txStateHistoryHelper.replayHistory(txMeta.history)
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// generate history entry and add to history
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const entry = txStateHistoryHelper.generateHistoryEntry(previousState, currentState, note)
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txMeta.history.push(entry)
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// commit txMeta to state
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const txId = txMeta.id
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const txList = this.getFullTxList()
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const index = txList.findIndex(txData => txData.id === txId)
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txList[index] = txMeta
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this._saveTxList(txList)
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}
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/**
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merges txParams obj onto txMeta.txParams
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use extend to ensure that all fields are filled
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@param txId {number} - the id of the txMeta
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@param txParams {object} - the updated txParams
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*/
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updateTxParams (txId, txParams) {
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const txMeta = this.getTx(txId)
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txMeta.txParams = extend(txMeta.txParams, txParams)
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this.updateTx(txMeta, `txStateManager#updateTxParams`)
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}
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/**
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validates txParams members by type
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@param txParams {object} - txParams to validate
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*/
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validateTxParams (txParams) {
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Object.keys(txParams).forEach((key) => {
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const value = txParams[key]
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// validate types
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switch (key) {
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case 'chainId':
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if (typeof value !== 'number' && typeof value !== 'string') throw new Error(`${key} in txParams is not a Number or hex string. got: (${value})`)
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break
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default:
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if (typeof value !== 'string') throw new Error(`${key} in txParams is not a string. got: (${value})`)
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if (!ethUtil.isHexPrefixed(value)) throw new Error(`${key} in txParams is not hex prefixed. got: (${value})`)
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break
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}
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})
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}
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/**
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@param opts {object} - an object of fields to search for eg:<br>
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let <code>thingsToLookFor = {<br>
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to: '0x0..',<br>
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from: '0x0..',<br>
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status: 'signed',<br>
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err: undefined,<br>
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}<br></code>
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@returns a {array} of txMeta with all
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options matching
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*/
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/*
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****************HINT****************
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| `err: undefined` is like looking |
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| for a tx with no err |
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| so you can also search txs that |
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| dont have something as well by |
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| setting the value as undefined |
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************************************
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this is for things like filtering a the tx list
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for only tx's from 1 account
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or for filltering for all txs from one account
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and that have been 'confirmed'
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*/
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getFilteredTxList (opts, initialList) {
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let filteredTxList = initialList
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Object.keys(opts).forEach((key) => {
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filteredTxList = this.getTxsByMetaData(key, opts[key], filteredTxList)
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})
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return filteredTxList
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}
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/**
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@param key {string} - the key to check
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@param value - the value your looking for
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@param txList {array} - [optional] the list to search. default is the txList
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from txStateManager#getTxList
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@returns {array} a list of txMetas who matches the search params
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*/
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getTxsByMetaData (key, value, txList = this.getTxList()) {
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return txList.filter((txMeta) => {
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if (txMeta.txParams[key]) {
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return txMeta.txParams[key] === value
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} else {
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return txMeta[key] === value
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}
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})
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}
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// get::set status
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/**
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@param txId {number} - the txMeta Id
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@return {string} the status of the tx.
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*/
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getTxStatus (txId) {
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const txMeta = this.getTx(txId)
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return txMeta.status
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}
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/**
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should update the status of the tx to 'rejected'.
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@param txId {number} - the txMeta Id
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*/
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setTxStatusRejected (txId) {
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this._setTxStatus(txId, 'rejected')
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}
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/**
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should update the status of the tx to 'unapproved'.
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@param txId {number} - the txMeta Id
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*/
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setTxStatusUnapproved (txId) {
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this._setTxStatus(txId, 'unapproved')
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}
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/**
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should update the status of the tx to 'approved'.
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@param txId {number} - the txMeta Id
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*/
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setTxStatusApproved (txId) {
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this._setTxStatus(txId, 'approved')
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}
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/**
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should update the status of the tx to 'signed'.
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@param txId {number} - the txMeta Id
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*/
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setTxStatusSigned (txId) {
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this._setTxStatus(txId, 'signed')
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}
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/**
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should update the status of the tx to 'submitted'.
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and add a time stamp for when it was called
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@param txId {number} - the txMeta Id
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*/
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setTxStatusSubmitted (txId) {
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const txMeta = this.getTx(txId)
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txMeta.submittedTime = (new Date()).getTime()
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this.updateTx(txMeta, 'txStateManager - add submitted time stamp')
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this._setTxStatus(txId, 'submitted')
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}
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/**
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should update the status of the tx to 'confirmed'.
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@param txId {number} - the txMeta Id
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*/
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setTxStatusConfirmed (txId) {
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this._setTxStatus(txId, 'confirmed')
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}
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/**
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should update the status of the tx to 'dropped'.
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@param txId {number} - the txMeta Id
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*/
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setTxStatusDropped (txId) {
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this._setTxStatus(txId, 'dropped')
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}
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/**
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should update the status of the tx to 'failed'.
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and put the error on the txMeta
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@param txId {number} - the txMeta Id
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@param err {erroObject} - error object
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*/
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setTxStatusFailed (txId, err) {
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const txMeta = this.getTx(txId)
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txMeta.err = {
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message: err.toString(),
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stack: err.stack,
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}
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this.updateTx(txMeta)
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this._setTxStatus(txId, 'failed')
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}
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/**
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Removes transaction from the given address for the current network
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from the txList
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@param address {string} - hex string of the from address on the txParams to remove
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*/
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wipeTransactions (address) {
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// network only tx
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const txs = this.getFullTxList()
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const network = this.getNetwork()
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// Filter out the ones from the current account and network
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const otherAccountTxs = txs.filter((txMeta) => !(txMeta.txParams.from === address && txMeta.metamaskNetworkId === network))
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// Update state
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this._saveTxList(otherAccountTxs)
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}
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//
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// PRIVATE METHODS
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//
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// STATUS METHODS
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// statuses:
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// - `'unapproved'` the user has not responded
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// - `'rejected'` the user has responded no!
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// - `'approved'` the user has approved the tx
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// - `'signed'` the tx is signed
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// - `'submitted'` the tx is sent to a server
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// - `'confirmed'` the tx has been included in a block.
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// - `'failed'` the tx failed for some reason, included on tx data.
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// - `'dropped'` the tx nonce was already used
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/**
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@param txId {number} - the txMeta Id
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@param status {string} - the status to set on the txMeta
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@emits tx:status-update - passes txId and status
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@emits ${txMeta.id}:finished - if it is a finished state. Passes the txMeta
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@emits update:badge
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*/
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_setTxStatus (txId, status) {
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const txMeta = this.getTx(txId)
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txMeta.status = status
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this.emit(`${txMeta.id}:${status}`, txId)
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this.emit(`tx:status-update`, txId, status)
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if (['submitted', 'rejected', 'failed'].includes(status)) {
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this.emit(`${txMeta.id}:finished`, txMeta)
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}
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this.updateTx(txMeta, `txStateManager: setting status to ${status}`)
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this.emit('update:badge')
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}
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/**
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Saves the new/updated txList.
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@param transactions {array} - the list of transactions to save
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*/
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// Function is intended only for internal use
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_saveTxList (transactions) {
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this.store.updateState({ transactions })
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}
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}
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module.exports = TransactionStateManager
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