feat: guard against multiple resolves

src/plugins/hooks.js

@@ -128,19 +128,28 @@ async function fireFilterHook(hook, hookList, params) {
 			return await hookObj.method(params);
 		}
 		return new Promise((resolve, reject) => {
+			let resolved = false;
+			function _resolve(result) {
+				if (resolved) {
+					winston.warn(`[plugins] ${hook} already resolved in plugin ${hookObj.id}`);
+					return;
+				}
+				resolved = true;
+				resolve(result);
+			}
 			const returned = hookObj.method(params, (err, result) => {
-				if (err) reject(err); else resolve(result);
+				if (err) reject(err); else _resolve(result);
 			});
 
 			if (utils.isPromise(returned)) {
 				returned.then(
-					payload => resolve(payload),
+					payload => _resolve(payload),
 					err => reject(err)
 				);
 				return;
 			}
 			if (returned) {
-				resolve(returned);
+				_resolve(returned);
 			}
 		});
 	}

test/plugins.js

@@ -71,6 +71,25 @@ describe('Plugins', () => {
 		assert.strictEqual(data.foo, 8);
 	});
 
+	it('should not error with invalid hooks', async () => {
+		function method1(data, callback) {
+			data.foo += 1;
+			return data;
+		}
+		function method2(data, callback) {
+			data.foo += 2;
+			// this is invalid
+			callback(null, data);
+			return data;
+		}
+
+		plugins.hooks.register('test-plugin', { hook: 'filter:test.hook3', method: method1 });
+		plugins.hooks.register('test-plugin', { hook: 'filter:test.hook3', method: method2 });
+
+		const data = await plugins.hooks.fire('filter:test.hook3', { foo: 1 });
+		assert.strictEqual(data.foo, 4);
+	});
+
 	it('should register and fire a filter hook that returns a promise that gets rejected', (done) => {
 		async function method(data) {
 			return new Promise((resolve, reject) => {
@@ -78,8 +97,8 @@ describe('Plugins', () => {
 				reject(new Error('nope'));
 			});
 		}
-		plugins.hooks.register('test-plugin', { hook: 'filter:test.hook3', method: method });
-		plugins.hooks.fire('filter:test.hook3', { foo: 1 }, (err) => {
+		plugins.hooks.register('test-plugin', { hook: 'filter:test.hook4', method: method });
+		plugins.hooks.fire('filter:test.hook4', { foo: 1 }, (err) => {
 			assert(err);
 			done();
 		});