webrequest/ts/index.ts
2019-06-04 15:23:47 +02:00

99 lines
2.3 KiB
TypeScript

import * as plugins from './webrequest.plugins';
/**
* web request
*/
export class WebRequest {
/**
* gets json
*/
public async getJson(urlArg: string | string[], requestBody?) {
const response = await this.request(urlArg, {
body: requestBody,
method: 'GET'
});
}
/**
* postJson
*/
postJson() {}
/**
* put js
*/
putJson() {}
/**
*
*/
async request(
urlArg: string | string[],
optionsArg: {
method: 'GET' | 'POST' | 'PUT' | 'DELETE';
body?: any;
}
) {
let allUrls: string[];
let usedUrlIndex = 0;
// determine what we got
if (Array.isArray(urlArg)) {
allUrls = urlArg;
} else {
allUrls = [urlArg];
}
const requestHistory: string[] = []; // keep track of the request history
const doHistoryCheck = async ( // check history for a
historyEntryTypeArg: string
) => {
requestHistory.push(historyEntryTypeArg);
if (historyEntryTypeArg === '429') {
console.log('got 429, so waiting a little bit.')
await plugins.smartdelay.delayFor(
Math.floor(Math.random() * (2000 - 1000 +1)) + 1000
); // wait between 1 and 10 seconds
}
let numOfHistoryType = 0;
for (const entry of requestHistory) {
if (entry === historyEntryTypeArg) numOfHistoryType++;
}
if (numOfHistoryType > (2 * allUrls.length * usedUrlIndex)) {
usedUrlIndex++;
}
};
// lets go recursive
const doRequest = async (urlToUse: string) => {
if (!urlToUse) {
throw new Error('request failed permanently');
}
const response = await fetch(urlToUse, {
method: optionsArg.method,
headers: {
'Content-Type': 'application/json'
},
body: optionsArg.body
});
console.log(`${urlToUse} answers with status: ${response.status}`);
if (response.status >= 200 && response.status < 300) {
return response;
} else {
await doHistoryCheck(response.status.toString());
// tslint:disable-next-line: no-return-await
return await doRequest(allUrls[usedUrlIndex]);
}
};
const finalResponse: Response = await doRequest(urlArg[usedUrlIndex]);
console.log(finalResponse);
return JSON.parse(await finalResponse.text());
}
}