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import * as _ from 'lodash';
import * as timers from 'timers';
// HACK: web3 leaks XMLHttpRequest into the global scope and causes requests to hang
// because they are using the wrong XHR package.
// Filed issue: https://github.com/ethereum/web3.js/issues/844
// tslint:disable-next-line:ordered-imports
import * as Web3 from 'web3';
const MAX_QUEUE_SIZE = 500;
const DEFAULT_QUEUE_INTERVAL_MS = 1000;
export class RequestQueue {
protected _queueIntervalMs: number;
protected _queue: string[];
protected _queueIntervalId: NodeJS.Timer;
protected _web3: Web3;
constructor(web3: any) {
this._queueIntervalMs = DEFAULT_QUEUE_INTERVAL_MS;
this._queue = [];
this._web3 = web3;
this._start();
}
public add(recipientAddress: string): boolean {
if (this.isFull()) {
return false;
}
this._queue.push(recipientAddress);
return true;
}
public size(): number {
return this._queue.length;
}
public isFull(): boolean {
return this.size() >= MAX_QUEUE_SIZE;
}
protected _start() {
this._queueIntervalId = timers.setInterval(() => {
const recipientAddress = this._queue.shift();
if (_.isUndefined(recipientAddress)) {
return;
}
// tslint:disable-next-line:no-floating-promises
this._processNextRequestFireAndForgetAsync(recipientAddress);
}, this._queueIntervalMs);
}
protected _stop() {
clearInterval(this._queueIntervalId);
}
// tslint:disable-next-line:prefer-function-over-method
protected async _processNextRequestFireAndForgetAsync(recipientAddress: string) {
throw new Error('Expected processNextRequestFireAndForgetAsync to be implemented by a subclass');
}
}
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