feat(Rest): add response and request events (#85)

Co-authored-by: Shubham Parihar <shubhamparihar391@gmail.com>
Co-authored-by: Rodry <38259440+ImRodry@users.noreply.github.com>
Co-authored-by: Vlad Frangu <kingdgrizzle@gmail.com>
Co-authored-by: SpaceEEC <24881032+SpaceEEC@users.noreply.github.com>

packages/rest/__tests__/REST.test.ts

@@ -1,7 +1,8 @@
 import nock from 'nock';
 import { DiscordSnowflake } from '@sapphire/snowflake';
-import { REST, DefaultRestOptions } from '../src';
+import { REST, DefaultRestOptions, APIRequest } from '../src';
 import { Routes, Snowflake } from 'discord-api-types/v9';
+import { Response } from 'node-fetch';
 
 const newSnowflake: Snowflake = DiscordSnowflake.generate().toString();
 
@@ -46,6 +47,9 @@ nock(`${DefaultRestOptions.api}/v${DefaultRestOptions.version}`)
 	.delete('/channels/339942739275677727/messages/392063687801700356')
 	.reply(200, { test: true })
 	.delete(`/channels/339942739275677727/messages/${newSnowflake}`)
+	.reply(200, { test: true })
+	.get('/request')
+	.times(2)
 	.reply(200, { test: true });
 
 test('simple GET', async () => {
@@ -202,3 +206,43 @@ test('Old Message Delete Edge-Case: Old message', async () => {
 test('Old Message Delete Edge-Case: New message', async () => {
 	expect(await api.delete(Routes.channelMessage('339942739275677727', newSnowflake))).toStrictEqual({ test: true });
 });
+
+test('Request and Response Events', async () => {
+	const requestListener = jest.fn();
+	const responseListener = jest.fn();
+
+	api.on('request', requestListener);
+	api.on('response', responseListener);
+
+	await api.get('/request');
+
+	expect(requestListener).toHaveBeenCalledTimes(1);
+	expect(responseListener).toHaveBeenCalledTimes(1);
+	expect(requestListener).toHaveBeenLastCalledWith<[APIRequest]>(
+		expect.objectContaining({
+			method: 'get',
+			path: '/request',
+			route: '/request',
+			data: { attachments: undefined, body: undefined },
+			retries: 0,
+		}),
+	);
+	expect(responseListener).toHaveBeenLastCalledWith<[APIRequest, Response]>(
+		expect.objectContaining({
+			method: 'get',
+			path: '/request',
+			route: '/request',
+			data: { attachments: undefined, body: undefined },
+			retries: 0,
+		}),
+		expect.objectContaining({ status: 200, statusText: 'OK' }),
+	);
+
+	api.off('request', requestListener);
+	api.off('response', responseListener);
+
+	await api.get('/request');
+
+	expect(requestListener).toHaveBeenCalledTimes(1);
+	expect(responseListener).toHaveBeenCalledTimes(1);
+});

packages/rest/src/lib/REST.ts

@@ -3,6 +3,7 @@ import { CDN } from './CDN';
 import { InternalRequest, RequestData, RequestManager, RequestMethod, RouteLike } from './RequestManager';
 import { DefaultRestOptions, RESTEvents } from './utils/constants';
 import type { AgentOptions } from 'node:https';
+import type { RequestInit, Response } from 'node-fetch';
 
 /**
  * Options to be passed when creating the REST instance
@@ -121,6 +122,33 @@ export interface RateLimitData {
  */
 export type RateLimitQueueFilter = (rateLimitData: RateLimitData) => boolean | Promise<boolean>;
 
+export interface APIRequest {
+	/**
+	 * The HTTP method used in this request
+	 */
+	method: string;
+	/**
+	 * The full path used to make the request
+	 */
+	path: RouteLike;
+	/**
+	 * The API route identifying the ratelimit for this request
+	 */
+	route: string;
+	/**
+	 * Additional HTTP options for this request
+	 */
+	options: RequestInit;
+	/**
+	 * The data that was used to form the body of this request
+	 */
+	data: Pick<InternalRequest, 'attachments' | 'body'>;
+	/**
+	 * The number of times this request has been attempted
+	 */
+	retries: number;
+}
+
 export interface InvalidRequestWarningData {
 	/**
 	 * Number of invalid requests that have been made in the window
@@ -136,6 +164,10 @@ export interface RestEvents {
 	invalidRequestWarning: [invalidRequestInfo: InvalidRequestWarningData];
 	restDebug: [info: string];
 	rateLimited: [rateLimitInfo: RateLimitData];
+	request: [request: APIRequest];
+	response: [request: APIRequest, response: Response];
+	newListener: [name: string, listener: (...args: any) => void];
+	removeListener: [name: string, listener: (...args: any) => void];
 }
 
 export interface REST {
@@ -166,6 +198,13 @@ export class REST extends EventEmitter {
 			.on(RESTEvents.Debug, this.emit.bind(this, RESTEvents.Debug))
 			.on(RESTEvents.RateLimited, this.emit.bind(this, RESTEvents.RateLimited))
 			.on(RESTEvents.InvalidRequestWarning, this.emit.bind(this, RESTEvents.InvalidRequestWarning));
+
+		this.on('newListener', (name, listener) => {
+			if (name === RESTEvents.Request || name === RESTEvents.Response) this.requestManager.on(name, listener);
+		});
+		this.on('removeListener', (name, listener) => {
+			if (name === RESTEvents.Request || name === RESTEvents.Response) this.requestManager.off(name, listener);
+		});
 	}
 
 	/**

packages/rest/src/lib/RequestManager.ts

@@ -116,7 +116,7 @@ export interface InternalRequest extends RequestData {
 export interface RouteData {
 	majorParameter: string;
 	bucketRoute: string;
-	original: string;
+	original: RouteLike;
 }
 
 export interface RequestManager {
@@ -317,7 +317,7 @@ export class RequestManager extends EventEmitter {
 	 * @param method The HTTP method this endpoint is called without
 	 * @private
 	 */
-	private static generateRouteData(endpoint: string, method: RequestMethod): RouteData {
+	private static generateRouteData(endpoint: RouteLike, method: RequestMethod): RouteData {
 		const majorIdMatch = /^\/(?:channels|guilds|webhooks)\/(\d{16,19})/.exec(endpoint);
 
 		// Get the major id for this route - global otherwise

packages/rest/src/lib/handlers/SequentialHandler.ts

@@ -284,6 +284,19 @@ export class SequentialHandler {
 		}
 		this.manager.globalRemaining--;
 
+		const method = options.method ?? 'get';
+
+		if (this.manager.listenerCount(RESTEvents.Request)) {
+			this.manager.emit(RESTEvents.Request, {
+				method,
+				path: routeId.original,
+				route: routeId.bucketRoute,
+				options,
+				data: bodyData,
+				retries,
+			});
+		}
+
 		const controller = new AbortController();
 		const timeout = setTimeout(() => controller.abort(), this.manager.options.timeout).unref();
 		let res: Response;
@@ -303,9 +316,23 @@ export class SequentialHandler {
 			clearTimeout(timeout);
 		}
 
+		if (this.manager.listenerCount(RESTEvents.Response)) {
+			this.manager.emit(
+				RESTEvents.Response,
+				{
+					method,
+					path: routeId.original,
+					route: routeId.bucketRoute,
+					options,
+					data: bodyData,
+					retries,
+				},
+				res.clone(),
+			);
+		}
+
 		let retryAfter = 0;
 
-		const method = options.method ?? 'get';
 		const limit = res.headers.get('X-RateLimit-Limit');
 		const remaining = res.headers.get('X-RateLimit-Remaining');
 		const reset = res.headers.get('X-RateLimit-Reset-After');

packages/rest/src/lib/utils/constants.ts

@@ -28,6 +28,8 @@ export const enum RESTEvents {
 	Debug = 'restDebug',
 	InvalidRequestWarning = 'invalidRequestWarning',
 	RateLimited = 'rateLimited',
+	Request = 'request',
+	Response = 'response',
 }
 
 export const ALLOWED_EXTENSIONS = ['webp', 'png', 'jpg', 'jpeg', 'gif'] as const;