74 lines
2.8 KiB
JavaScript
74 lines
2.8 KiB
JavaScript
"use strict"
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const https = require("https")
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const config = require("../config")
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const getGasPrice = function () {
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const url = 'https://ethgasstation.info/json/ethgasAPI.json'
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// return new pending promise
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return new Promise((resolve, reject) => {
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// select http or https module, depending on reqested url
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const lib = url.startsWith('https') ? require('https') : require('http')
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const request = lib.get(url, (response) => {
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// handle http errors
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if (response.statusCode < 200 || response.statusCode > 299) {
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reject('Failed to load page, status code: ' + response.statusCode)
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}
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// temporary data holder
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const body = []
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// on every content chunk, push it to the data array
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response.on('data', (chunk) => body.push(chunk))
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// we are done, resolve promise with those joined chunks
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response.on('end', () => {
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// safeLowWait returns GWei (10^10 Wei).
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const jsonBody = JSON.parse(body.join(''))
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const gasPriceWei = parseInt(jsonBody['safeLowWait']) * Math.pow(10, 10)
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resolve(gasPriceWei)
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})
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})
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// handle connection errors of the request
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request.on('error', (err) => reject(err))
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})
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}
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const getTokenPriceMock = function () {
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return new Promise((resolve, reject) => resolve(0.35))
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}
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const getTokenPrice = function (token) {
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if (config.debug) {
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return getTokenPriceMock()
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}
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const currency = 'USD'
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const url = 'https://min-api.cryptocompare.com/data/price?fsym=' + token + '&tsyms=' + currency
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// return new pending promise
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return new Promise((resolve, reject) => {
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// select http or https module, depending on reqested url
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const lib = url.startsWith('https') ? require('https') : require('http')
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const request = lib.get(url, (response) => {
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// handle http errors
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if (response.statusCode < 200 || response.statusCode > 299) {
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reject('Failed to load page, status code: ' + response.statusCode)
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}
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// temporary data holder
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const body = []
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// on every content chunk, push it to the data array
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response.on('data', (chunk) => body.push(chunk))
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// we are done, resolve promise with those joined chunks
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response.on('end', () => {
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const jsonBody = JSON.parse(body.join(''))
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const tokenPrice = parseFloat(jsonBody[currency])
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resolve(tokenPrice)
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})
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})
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// handle connection errors of the request
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request.on('error', (err) => reject(err))
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})
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}
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module.exports = {
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getGasPrice: getGasPrice,
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getTokenPrice: getTokenPrice
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}
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