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import React, { Component } from 'react'
import PropTypes from 'prop-types'
import TokenTracker from 'eth-token-tracker'
export default function withTokenTracker (WrappedComponent) {
return class TokenTrackerWrappedComponent extends Component {
static propTypes = {
userAddress: PropTypes.string.isRequired,
token: PropTypes.object.isRequired,
}
constructor (props) {
super(props)
this.state = {
string: '',
symbol: '',
error: null,
}
this.tracker = null
this.updateBalance = this.updateBalance.bind(this)
this.setError = this.setError.bind(this)
}
componentDidMount () {
this.createFreshTokenTracker()
}
componentDidUpdate (prevProps) {
const { userAddress: newAddress, token: { address: newTokenAddress } } = this.props
const { userAddress: oldAddress, token: { address: oldTokenAddress } } = prevProps
if ((oldAddress === newAddress) && (oldTokenAddress === newTokenAddress)) {
return
}
if ((!oldAddress || !newAddress) && (!oldTokenAddress || !newTokenAddress)) {
return
}
this.createFreshTokenTracker()
}
componentWillUnmount () {
this.removeListeners()
}
createFreshTokenTracker () {
this.removeListeners()
if (!global.ethereumProvider) {
return
}
const { userAddress, token } = this.props
this.tracker = new TokenTracker({
userAddress,
provider: global.ethereumProvider,
tokens: [token],
pollingInterval: 8000,
})
this.tracker.on('update', this.updateBalance)
this.tracker.on('error', this.setError)
this.tracker.updateBalances()
.then(() => this.updateBalance(this.tracker.serialize()))
.catch(error => this.setState({ error: error.message }))
}
setError (error) {
this.setState({ error })
}
updateBalance (tokens = []) {
if (!this.tracker.running) {
return
}
const [{ string, symbol }] = tokens
this.setState({ string, symbol, error: null })
}
removeListeners () {
if (this.tracker) {
this.tracker.stop()
this.tracker.removeListener('update', this.updateBalance)
this.tracker.removeListener('error', this.setError)
}
}
render () {
const { string, symbol, error } = this.state
return (
<WrappedComponent
{ ...this.props }
string={string}
symbol={symbol}
error={error}
/>
)
}
}
}
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