import { cloneDeep } from 'lodash' import BigNumber from 'bignumber.js' import { getStorageItem, setStorageItem } from '../../../lib/storage-helpers' import { decGWEIToHexWEI } from '../../helpers/utils/conversions.util' import getFetchWithTimeout from '../../../../shared/modules/fetch-with-timeout' const fetchWithTimeout = getFetchWithTimeout(30000) // Actions const BASIC_GAS_ESTIMATE_LOADING_FINISHED = 'metamask/gas/BASIC_GAS_ESTIMATE_LOADING_FINISHED' const BASIC_GAS_ESTIMATE_LOADING_STARTED = 'metamask/gas/BASIC_GAS_ESTIMATE_LOADING_STARTED' const RESET_CUSTOM_GAS_STATE = 'metamask/gas/RESET_CUSTOM_GAS_STATE' const RESET_CUSTOM_DATA = 'metamask/gas/RESET_CUSTOM_DATA' const SET_BASIC_GAS_ESTIMATE_DATA = 'metamask/gas/SET_BASIC_GAS_ESTIMATE_DATA' const SET_CUSTOM_GAS_LIMIT = 'metamask/gas/SET_CUSTOM_GAS_LIMIT' const SET_CUSTOM_GAS_PRICE = 'metamask/gas/SET_CUSTOM_GAS_PRICE' const SET_BASIC_PRICE_ESTIMATES_LAST_RETRIEVED = 'metamask/gas/SET_BASIC_PRICE_ESTIMATES_LAST_RETRIEVED' const initState = { customData: { price: null, limit: null, }, basicEstimates: { safeLow: null, average: null, fast: null, }, basicEstimateIsLoading: true, basicPriceEstimatesLastRetrieved: 0, } // Reducer export default function reducer(state = initState, action) { switch (action.type) { case BASIC_GAS_ESTIMATE_LOADING_STARTED: return { ...state, basicEstimateIsLoading: true, } case BASIC_GAS_ESTIMATE_LOADING_FINISHED: return { ...state, basicEstimateIsLoading: false, } case SET_BASIC_GAS_ESTIMATE_DATA: return { ...state, basicEstimates: action.value, } case SET_CUSTOM_GAS_PRICE: return { ...state, customData: { ...state.customData, price: action.value, }, } case SET_CUSTOM_GAS_LIMIT: return { ...state, customData: { ...state.customData, limit: action.value, }, } case SET_BASIC_PRICE_ESTIMATES_LAST_RETRIEVED: return { ...state, basicPriceEstimatesLastRetrieved: action.value, } case RESET_CUSTOM_DATA: return { ...state, customData: cloneDeep(initState.customData), } case RESET_CUSTOM_GAS_STATE: return cloneDeep(initState) default: return state } } // Action Creators export function basicGasEstimatesLoadingStarted() { return { type: BASIC_GAS_ESTIMATE_LOADING_STARTED, } } export function basicGasEstimatesLoadingFinished() { return { type: BASIC_GAS_ESTIMATE_LOADING_FINISHED, } } async function basicGasPriceQuery() { const url = `https://api.metaswap.codefi.network/gasPrices` return await fetchWithTimeout(url, { headers: {}, referrer: 'https://api.metaswap.codefi.network/gasPrices', referrerPolicy: 'no-referrer-when-downgrade', body: null, method: 'GET', mode: 'cors', }) } export function fetchBasicGasEstimates() { return async (dispatch, getState) => { const { basicPriceEstimatesLastRetrieved } = getState().gas const timeLastRetrieved = basicPriceEstimatesLastRetrieved || (await getStorageItem('BASIC_PRICE_ESTIMATES_LAST_RETRIEVED')) || 0 dispatch(basicGasEstimatesLoadingStarted()) let basicEstimates if (Date.now() - timeLastRetrieved > 75000) { basicEstimates = await fetchExternalBasicGasEstimates(dispatch) } else { const cachedBasicEstimates = await getStorageItem('BASIC_PRICE_ESTIMATES') basicEstimates = cachedBasicEstimates || (await fetchExternalBasicGasEstimates(dispatch)) } dispatch(setBasicGasEstimateData(basicEstimates)) dispatch(basicGasEstimatesLoadingFinished()) return basicEstimates } } async function fetchExternalBasicGasEstimates(dispatch) { const response = await basicGasPriceQuery() const { SafeGasPrice, ProposeGasPrice, FastGasPrice } = await response.json() const [safeLow, average, fast] = [ SafeGasPrice, ProposeGasPrice, FastGasPrice, ].map((price) => new BigNumber(price, 10).toNumber()) const basicEstimates = { safeLow, average, fast, } const timeRetrieved = Date.now() await Promise.all([ setStorageItem('BASIC_PRICE_ESTIMATES', basicEstimates), setStorageItem('BASIC_PRICE_ESTIMATES_LAST_RETRIEVED', timeRetrieved), ]) dispatch(setBasicPriceEstimatesLastRetrieved(timeRetrieved)) return basicEstimates } export function setCustomGasPriceForRetry(newPrice) { return async (dispatch) => { if (newPrice === '0x0') { const { fast } = await getStorageItem('BASIC_PRICE_ESTIMATES') dispatch(setCustomGasPrice(decGWEIToHexWEI(fast))) } else { dispatch(setCustomGasPrice(newPrice)) } } } export function setBasicGasEstimateData(basicGasEstimateData) { return { type: SET_BASIC_GAS_ESTIMATE_DATA, value: basicGasEstimateData, } } export function setCustomGasPrice(newPrice) { return { type: SET_CUSTOM_GAS_PRICE, value: newPrice, } } export function setCustomGasLimit(newLimit) { return { type: SET_CUSTOM_GAS_LIMIT, value: newLimit, } } export function setBasicPriceEstimatesLastRetrieved(retrievalTime) { return { type: SET_BASIC_PRICE_ESTIMATES_LAST_RETRIEVED, value: retrievalTime, } } export function resetCustomGasState() { return { type: RESET_CUSTOM_GAS_STATE } } export function resetCustomData() { return { type: RESET_CUSTOM_DATA } }