import * as fs from 'fs'; import { getToken } from '../database/config.js'; import { PriorityQueue } from './priority_queue.js'; let busy = false; // lets us know if we are already sending api requests or not. let headers = undefined; // a file scope variable so that we only evaluate these once. let queue = new PriorityQueue(); // a priority queue to hold api calls we want to send, allows for throttling. // send takes a request object as argument and an optional context ctx // example request: { // endpoint: the url endpoint to call, // method: HTTP method for `fetch` call, defaults to 'GET', // payload: optional json object that will be send along with the request, // priority: optional priority value (defaults to 10, lower than 10 means the message will be sent faster) // } export function send(request, ctx) { return new Promise((resolve, reject) => { let data = { ctx: ctx, reject: reject, request: request, resolve: resolve, }; if (!busy) { busy = true; send_this(data); } else { queue.enqueue(data, request.priority ? request.priority : 10); } }); } function send_next() { if (queue.isEmpty()) { busy = false; } else { send_this(queue.dequeue().element); } } // send_this take a data object as argument built in the send function above function send_this(data) { if (headers === undefined) { const token = getToken(); if (token === null) { throw 'Could not get token from the database. Did you init or register yet?'; } headers = { 'Content-Type': 'application/json', 'Authorization': `Bearer ${token}` }; } let options = { headers: headers, }; if (data.request.method !== undefined) { options['method'] = data.request.method; } if (data.request.payload !== undefined) { options['body'] = JSON.stringify(data.request.payload); } fs.writeFileSync('log', JSON.stringify({event: 'send', date: new Date(), data: data}) + '\n', {flag: 'a+'}); fetch(`https://api.spacetraders.io/v2${data.request.endpoint}`, options) .then(response => response.json()) .then(response => { fs.writeFileSync('log', JSON.stringify({event: 'response', date: new Date(), data: response}) + '\n', {flag: 'a+'}); return data.resolve(response);}) .catch(err => { fs.writeFileSync('log', JSON.stringify({event: 'error', date: new Date(), data: err}) + '\n', {flag: 'a+'}); data.reject(err)}); setTimeout(send_next, 500); } export function debugLog(ctx) { console.log(`--- ${Date()} -----------------------------------------------------------------------------`); console.log(JSON.stringify(ctx, null, 2)); } export function sleep(delay) { return new Promise((resolve) => setTimeout(resolve, delay)) }