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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))
}
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