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import { BigNumber, logUtils } from '@0xproject/utils';
import * as _ from 'lodash';
import * as queryString from 'query-string';
import {
ArticlesBySection,
ItemByAddress,
WebsiteBackendGasInfo,
WebsiteBackendPriceInfo,
WebsiteBackendRelayerInfo,
} from 'ts/types';
import { configs } from 'ts/utils/configs';
import { errorReporter } from 'ts/utils/error_reporter';
const ETH_GAS_STATION_ENDPOINT = '/eth_gas_station';
const PRICES_ENDPOINT = '/prices';
const RELAYERS_ENDPOINT = '/relayers';
const WIKI_ENDPOINT = '/wiki';
export const backendClient = {
async getGasInfoAsync(): Promise<WebsiteBackendGasInfo> {
const result = await requestAsync(ETH_GAS_STATION_ENDPOINT);
return result;
},
async getPriceInfosAsync(tokenAddresses: string[]): Promise<WebsiteBackendPriceInfo[]> {
if (_.isEmpty(tokenAddresses)) {
return [];
}
const joinedTokenAddresses = tokenAddresses.join(',');
const queryParams = {
tokens: joinedTokenAddresses,
};
const result = await requestAsync(PRICES_ENDPOINT, queryParams);
return result;
},
async getRelayerInfosAsync(): Promise<WebsiteBackendRelayerInfo[]> {
const result = await requestAsync(RELAYERS_ENDPOINT);
return result;
},
async getWikiArticlesBySectionAsync(): Promise<ArticlesBySection> {
const result = await requestAsync(WIKI_ENDPOINT);
return result;
},
};
async function requestAsync(endpoint: string, queryParams?: object): Promise<any> {
const query = queryStringFromQueryParams(queryParams);
const url = `${configs.BACKEND_BASE_URL}${endpoint}${query}`;
const response = await fetch(url);
if (response.status !== 200) {
const errorText = `Error requesting url: ${url}, ${response.status}: ${response.statusText}`;
logUtils.log(errorText);
const error = Error(errorText);
// tslint:disable-next-line:no-floating-promises
errorReporter.reportAsync(error);
throw error;
}
const result = await response.json();
return result;
}
function queryStringFromQueryParams(queryParams?: object): string {
// if params are undefined or empty, return an empty string
if (_.isUndefined(queryParams) || _.isEmpty(queryParams)) {
return '';
}
// stringify the formatted object
const stringifiedParams = queryString.stringify(queryParams);
return `?${stringifiedParams}`;
}
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