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const Component = require('react').Component
const h = require('react-hyperscript')
const inherits = require('util').inherits
const TokenTracker = require('eth-token-tracker')
const TokenCell = require('./token-cell.js')
const normalizeAddress = require('eth-sig-util').normalize
const connect = require('react-redux').connect
const selectors = require('../selectors')
function mapStateToProps (state) {
return {
network: state.metamask.network,
tokens: state.metamask.tokens,
userAddress: selectors.getSelectedAddress(state),
}
}
const defaultTokens = []
const contracts = require('eth-contract-metadata')
for (const address in contracts) {
const contract = contracts[address]
if (contract.erc20) {
contract.address = address
defaultTokens.push(contract)
}
}
module.exports = connect(mapStateToProps)(TokenList)
inherits(TokenList, Component)
function TokenList () {
this.state = {
tokens: [],
isLoading: true,
network: null,
}
Component.call(this)
}
TokenList.prototype.render = function () {
const state = this.state
const { tokens, isLoading, error } = state
if (isLoading) {
return this.message('Loading Tokens...')
}
if (error) {
log.error(error)
return this.message('There was a problem loading your token balances.')
}
return h('div', tokens.map((tokenData) => h(TokenCell, tokenData)))
}
TokenList.prototype.message = function (body) {
return h('div', {
style: {
display: 'flex',
height: '250px',
alignItems: 'center',
justifyContent: 'center',
padding: '30px',
},
}, body)
}
TokenList.prototype.componentDidMount = function () {
this.createFreshTokenTracker()
}
TokenList.prototype.createFreshTokenTracker = function () {
if (this.tracker) {
// Clean up old trackers when refreshing:
this.tracker.stop()
this.tracker.removeListener('update', this.balanceUpdater)
this.tracker.removeListener('error', this.showError)
}
if (!global.ethereumProvider) return
const { userAddress } = this.props
this.tracker = new TokenTracker({
userAddress,
provider: global.ethereumProvider,
tokens: uniqueMergeTokens(defaultTokens, this.props.tokens),
pollingInterval: 8000,
})
// Set up listener instances for cleaning up
this.balanceUpdater = this.updateBalances.bind(this)
this.showError = (error) => {
this.setState({ error, isLoading: false })
}
this.tracker.on('update', this.balanceUpdater)
this.tracker.on('error', this.showError)
this.tracker.updateBalances()
.then(() => {
this.updateBalances(this.tracker.serialize())
})
.catch((reason) => {
log.error(`Problem updating balances`, reason)
this.setState({ isLoading: false })
})
}
TokenList.prototype.componentDidUpdate = function (nextProps) {
const {
network: oldNet,
userAddress: oldAddress,
} = this.props
const {
network: newNet,
userAddress: newAddress,
} = nextProps
if (newNet === 'loading') return
if (!oldNet || !newNet || !oldAddress || !newAddress) return
if (oldAddress === newAddress && oldNet === newNet) return
this.setState({ isLoading: true })
this.createFreshTokenTracker()
}
TokenList.prototype.updateBalances = function (tokens) {
const heldTokens = tokens.filter(token => {
return token.balance !== '0' && token.string !== '0.000'
})
this.setState({ tokens: heldTokens, isLoading: false })
}
TokenList.prototype.componentWillUnmount = function () {
if (!this.tracker) return
this.tracker.stop()
}
function uniqueMergeTokens (tokensA, tokensB = []) {
const uniqueAddresses = []
const result = []
tokensA.concat(tokensB).forEach((token) => {
const normal = normalizeAddress(token.address)
if (!uniqueAddresses.includes(normal)) {
uniqueAddresses.push(normal)
result.push(token)
}
})
return result
}
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