import { fetchAsync, logUtils } from '@0xproject/utils'; import * as _ from 'lodash'; import * as queryString from 'query-string'; import { errorReporter } from 'ts/utils/error_reporter'; const logErrorIfPresent = (response: Response, requestedURL: string) => { if (response.status !== 200) { const errorText = `Error requesting url: ${requestedURL}, ${response.status}: ${response.statusText}`; logUtils.log(errorText); const error = Error(errorText); errorReporter.report(error); throw error; } }; export const fetchUtils = { async requestAsync(baseUrl: string, path: string, queryParams?: object): Promise { const query = queryStringFromQueryParams(queryParams); const url = `${baseUrl}${path}${query}`; const response = await fetchAsync(url); logErrorIfPresent(response, url); const result = await response.json(); return result; }, async postAsync(baseUrl: string, path: string, body: object): Promise { const url = `${baseUrl}${path}`; const response = await fetchAsync(url, { method: 'POST', headers: { 'Content-Type': 'application/json', }, body: JSON.stringify(body), }); logErrorIfPresent(response, url); return response; }, }; function queryStringFromQueryParams(queryParams?: object): string { // if params are undefined or empty, return an empty string if (_.isUndefined(queryParams) || _.isEmpty(queryParams)) { return ''; } // stringify the formatted object const stringifiedParams = queryString.stringify(queryParams); return `?${stringifiedParams}`; }