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script.js
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script.js
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import 'core-js/stable'
import 'regenerator-runtime/runtime'
import Aragon, { events } from '@aragon/api'
import { first } from 'rxjs/operators'
import tmAbi from './abi/tokenManager.json'
import { requestStatus } from './lib/constants'
import {
tokenDataFallback,
getTokenSymbol,
getTokenName,
getTokenDecimals,
ETHER_TOKEN_FAKE_ADDRESS,
} from './lib/token-utils'
const app = new Aragon()
const ETHER_DATA = {
decimals: 18,
name: 'Ether',
symbol: 'ETH',
}
app
.call('tokenManager')
.subscribe(initialize, err =>
console.error(`Could not start background script execution due to the contract not loading token: ${err}`)
)
async function initialize(tokenManagerAddress) {
let tokens
const network = await app
.network()
.pipe(first())
.toPromise()
const tmContract = app.external(tokenManagerAddress, tmAbi)
tokens = await app.call('getAcceptedDepositTokens').toPromise()
const settings = {
network,
}
return createStore(tmContract, tokens, settings)
}
async function createStore(tokenManagerContract, tokens, settings) {
return app.store(
(state, { event, returnValues, blockNumber }) => {
let nextState = {
...state,
}
switch (event) {
case events.ACCOUNTS_TRIGGER:
return updateConnectedAccount(nextState, returnValues)
case events.SYNC_STATUS_SYNCING:
return { ...nextState, isSyncing: true }
case events.SYNC_STATUS_SYNCED:
return { ...nextState, isSyncing: false }
case 'TokenRequestCreated':
return newTokenRequest(nextState, returnValues, settings, blockNumber)
case 'TokenRequestRefunded':
return requestRefunded(nextState, returnValues)
case 'TokenRequestFinalised':
return requestFinalised(nextState, returnValues)
default:
return state
}
},
{
init: initializeState(tokenManagerContract, tokens, settings),
}
)
}
/***********************
* *
* Event Handlers *
* *
***********************/
function initializeState(tokenManagerContract, tokens, settings) {
return async cachedState => {
try {
const minimeAddress = await tokenManagerContract.token().toPromise()
const token = await getTokenData(minimeAddress, settings)
const acceptedTokens = await getAcceptedTokens(tokens, settings)
tokens.includes(ETHER_TOKEN_FAKE_ADDRESS) &&
acceptedTokens.unshift({
...ETHER_DATA,
address: ETHER_TOKEN_FAKE_ADDRESS,
})
token && app.indentify(`token-request ${token.symbol}`)
return {
...cachedState,
isSyncing: true,
token,
acceptedTokens: acceptedTokens,
}
} catch (error) {
console.error('Error initializing state: ', error)
}
}
}
const getAcceptedTokens = async (tokens, settings) => {
const promises = tokens
.filter(token => token != ETHER_TOKEN_FAKE_ADDRESS)
.map(tokenAddress => getTokenData(tokenAddress, settings))
return Promise.all(promises)
}
async function updateConnectedAccount(state, { account }) {
return {
...state,
account,
}
}
async function newTokenRequest(
state,
{ requestId, requesterAddress, depositToken, depositAmount, requestAmount },
settings,
blockNumber
) {
try {
const { requests = [] } = state
const { decimals, name, symbol } =
depositToken === ETHER_TOKEN_FAKE_ADDRESS ? ETHER_DATA : await getTokenData(depositToken, settings)
const { timestamp } = await app.web3Eth('getBlock', blockNumber).toPromise()
return {
...state,
requests: [
...requests,
{
requestId,
requesterAddress,
depositToken,
depositDecimals: decimals,
depositName: name,
depositSymbol: symbol,
depositAmount,
requestAmount,
status: requestStatus.PENDING,
date: marshallDate(timestamp),
},
],
}
} catch (err) {
console.log(err)
}
}
async function requestRefunded(state, { requestId }) {
const { requests } = state
const nextStatus = requestStatus.WITHDRAWN
return {
...state,
requests: await updateRequestStatus(requests, requestId, nextStatus),
}
}
async function requestFinalised(state, { requestId }) {
const { requests } = state
const nextStatus = requestStatus.APPROVED
return {
...state,
requests: await updateRequestStatus(requests, requestId, nextStatus),
}
}
/***********************
* *
* Helpers *
* *
***********************/
async function getTokenData(tokenAddress, settings) {
const [decimals, name, symbol] = await Promise.all([
loadTokenDecimals(tokenAddress, settings),
loadTokenName(tokenAddress, settings),
loadTokenSymbol(tokenAddress, settings),
])
return {
decimals,
name,
symbol,
address: tokenAddress,
}
}
async function updateRequestStatus(requests, requestId, nextStatus) {
const requestIndex = requests.findIndex(request => request.requestId === requestId)
if (requestIndex !== -1) {
const nextRequests = Array.from(requests)
nextRequests[requestIndex] = {
...nextRequests[requestIndex],
status: nextStatus,
}
return nextRequests
} else {
console.error(`Tried to update request #${requestId} that shouldn't exist!`)
}
}
async function loadTokenName(tokenAddress, { network }) {
const fallback = tokenDataFallback(tokenAddress, 'name', network.type) || ''
let name
try {
name = (await getTokenName(app, tokenAddress)) || fallback
} catch (err) {
// name is optional
name = fallback
}
return name
}
async function loadTokenSymbol(tokenAddress, { network }) {
const fallback = tokenDataFallback(tokenAddress, 'symbol', network.type) || ''
let symbol
try {
symbol = (await getTokenSymbol(app, tokenAddress)) || fallback
} catch (err) {
// symbol is optional
symbol = fallback
}
return symbol
}
async function loadTokenDecimals(tokenAddress, { network }) {
const fallback = tokenDataFallback(tokenAddress, 'decimals', network.type) || '0'
let decimals
try {
decimals = (await getTokenDecimals(app, tokenAddress)) || fallback
} catch (err) {
// decimals is optional
decimals = fallback
}
return decimals
}
function marshallDate(date) {
// Represent dates as real numbers, as it's very unlikely they'll hit the limit...
// Adjust for js time (in ms vs s)
return parseInt(date, 10) * 1000
}