n8n/packages/nodes-base/nodes/HackerNews/GenericFunctions.ts

import {
	IExecuteFunctions,
	IHookFunctions,
} from 'n8n-core';

import {
	IDataObject,
	ILoadOptionsFunctions,
} from 'n8n-workflow';

import {
	OptionsWithUri,
} from 'request';


/**
 * Make an API request to HackerNews
 *
 * @param {IHookFunctions} this
 * @param {string} method
 * @param {string} endpoint
 * @param {IDataObject} qs
 * @returns {Promise<any>}
 */
export async function hackerNewsApiRequest(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, method: string, endpoint: string, qs: IDataObject): Promise<any> { // tslint:disable-line:no-any
	const options: OptionsWithUri = {
		method,
		qs,
		uri: `http://hn.algolia.com/api/v1/${endpoint}`,
		json: true,
	};

	try {
		return await this.helpers.request!(options);
	} catch (error) {

		if (error.response && error.response.body && error.response.body.error) {
			// Try to return the error prettier
			throw new Error(`Hacker News error response [${error.statusCode}]: ${error.response.body.error}`);
		}

		throw error;
	}
}


/**
 * Make an API request to HackerNews
 * and return all results
 *
 * @export
 * @param {(IHookFunctions | IExecuteFunctions)} this
 * @param {string} method
 * @param {string} endpoint
 * @param {IDataObject} qs
 * @returns {Promise<any>}
 */
export async function hackerNewsApiRequestAllItems(this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions, method: string, endpoint: string, qs: IDataObject): Promise<any> { // tslint:disable-line:no-any

	qs.hitsPerPage = 100;

	const returnData: IDataObject[] = [];

	let responseData;
	let itemsReceived = 0;

	do {
		responseData = await hackerNewsApiRequest.call(this, method, endpoint, qs);
		returnData.push.apply(returnData, responseData.hits);

		if (returnData !== undefined) {
			itemsReceived += returnData.length;
		}

	} while (
		responseData.nbHits > itemsReceived
	);

	return returnData;
}