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const ObservableStore = require('obs-store')
const extend = require('xtend')
// every three seconds when an incomplete tx is waiting
const POLLING_INTERVAL = 3000
// drop txs that haven't been paid to in 11 mins
const TIMEOUT_LIMIT = 660000
class ShapeshiftController {
constructor (opts = {}) {
const initState = extend({
shapeShiftTxList: [],
}, opts.initState)
this.store = new ObservableStore(initState)
this.pollForUpdates()
}
//
// PUBLIC METHODS
//
getShapeShiftTxList () {
const shapeShiftTxList = this.store.getState().shapeShiftTxList
return shapeShiftTxList
}
getPendingTxs () {
this.removeOldTxs()
const txs = this.getShapeShiftTxList()
const pending = txs.filter(tx => tx.response && tx.response.status !== 'complete')
return pending
}
removeOldTxs() {
const { shapeShiftTxList } = this.store.getState()
const now = new Date().getTime()
const old = shapeShiftTxList.find((tx) => {
return tx.time + TIMEOUT_LIMIT < now
})
old.forEach(tx => this.removeShapeShiftTx(tx))
}
pollForUpdates () {
const pendingTxs = this.getPendingTxs()
if (pendingTxs.length === 0) {
return
}
Promise.all(pendingTxs.map((tx) => {
return this.updateTx(tx)
}))
.then((results) => {
results.forEach(tx => this.saveTx(tx))
this.timeout = setTimeout(this.pollForUpdates.bind(this), POLLING_INTERVAL)
})
}
updateTx (tx) {
const url = `https://shapeshift.io/txStat/${tx.depositAddress}`
return fetch(url)
.then((response) => {
return response.json()
}).then((json) => {
tx.response = json
if (tx.response.status === 'complete') {
tx.time = new Date().getTime()
}
return tx
})
}
saveTx (tx) {
const { shapeShiftTxList } = this.store.getState()
const index = shapeShiftTxList.indexOf(tx)
if (index !== -1) {
shapeShiftTxList[index] = tx
this.store.updateState({ shapeShiftTxList })
}
}
removeShapeShiftTx (tx) {
const { shapeShiftTxList } = this.store.getState()
const index = shapeShiftTxList.indexOf(index)
if (index !== -1) {
shapeShiftTxList.splice(index, 1)
}
this.updateState({ shapeShiftTxList })
}
createShapeShiftTx (depositAddress, depositType) {
const state = this.store.getState()
let { shapeShiftTxList } = state
var shapeShiftTx = {
depositAddress,
depositType,
key: 'shapeshift',
time: new Date().getTime(),
response: {},
}
if (!shapeShiftTxList) {
shapeShiftTxList = [shapeShiftTx]
} else {
shapeShiftTxList.push(shapeShiftTx)
}
this.store.updateState({ shapeShiftTxList })
this.pollForUpdates()
}
}
module.exports = ShapeshiftController
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