Execution context getters using closures (#2461)

* no async hooks lol

* changeset

* Update docs #2461

---------

Co-authored-by: Kamil Kisiela <[email protected]>

Author: enisdenjo

.changeset/stupid-otters-march.md

@@ -0,0 +1,5 @@
+---
+'graphql-modules': patch
+---
+
+Execution context getters using closures

packages/graphql-modules/src/application/context.ts

@@ -5,7 +5,6 @@ import { once, merge } from '../shared/utils';
 import type { InternalAppContext, ModulesMap } from './application';
 import { attachGlobalProvidersMap } from './di';
 import { CONTEXT } from './tokens';
-import { executionContext, ExecutionContextPicker } from './execution-context';
 
 export type ExecutionContextBuilder<
   TContext extends {
@@ -67,13 +66,13 @@ export function createContextBuilder({
       },
     });
 
-    appInjector.setExecutionContextGetter(
-      executionContext.getApplicationContext as any
-    );
+    appInjector.setExecutionContextGetter(function executionContextGetter() {
+      return appContext;
+    } as any);
 
     function createModuleExecutionContextGetter(moduleId: string) {
       return function moduleExecutionContextGetter() {
-        return executionContext.getModuleContext(moduleId);
+        return getModuleContext(moduleId, context);
       };
     }
 
@@ -83,18 +82,6 @@ export function createContextBuilder({
       );
     });
 
-    const executionContextPicker: ExecutionContextPicker = {
-      getApplicationContext() {
-        return appContext;
-      },
-      getModuleContext(moduleId) {
-        return getModuleContext(moduleId, context);
-      },
-    };
-    const destroyExecutionContext = executionContext.create(
-      executionContextPicker
-    );
-
     // As the name of the Injector says, it's an Operation scoped Injector
     // Application level
     // Operation scoped - means it's created and destroyed on every GraphQL Operation
@@ -186,7 +173,6 @@ export function createContextBuilder({
             injector._getObjByKeyId(keyId).onDestroy();
           }
         });
-        destroyExecutionContext();
         contextCache = {};
       }),
       ɵinjector: operationAppInjector,

packages/graphql-modules/src/application/execution-context-async-local-storage.ts

@@ -6,7 +6,6 @@ import {
   ensureInjectableMetadata,
 } from './metadata';
 import { Injector } from './injector';
-import { enableExecutionContext } from '../application/execution-context';
 
 function ensureReflect() {
   if (!(Reflect && Reflect.getOwnMetadata)) {
@@ -17,7 +16,6 @@ function ensureReflect() {
 export function Injectable(options?: ProviderOptions): ClassDecorator {
   return (target) => {
     ensureReflect();
-    enableExecutionContext();
 
     const params: Type<any>[] = (
       Reflect.getMetadata('design:paramtypes', target) || []

packages/graphql-modules/src/application/execution-context-hooks.ts

@@ -12,20 +12,8 @@ import {
   Inject,
 } from '../src';
 
-import {
-  getExecutionContextDependencyStore,
-  getExecutionContextStore,
-} from '../src/application/execution-context-hooks';
-
 const posts = ['Foo', 'Bar'];
 
-afterEach(() => {
-  // There should be no execution context left after each test
-  expect(
-    getExecutionContextDependencyStore().size + getExecutionContextStore().size
-  ).toBe(0);
-});
-
 test('ExecutionContext on module level provider', async () => {
   const spies = {
     posts: jest.fn(),

packages/graphql-modules/src/application/execution-context.interface.ts

@@ -38,12 +38,3 @@ The next lines show the usage of `@ExecutionContext` decorator. It's a property
 This way the Singleton `Data` service runs within the execution context of a GraphQL Operation and can access Operation scoped Injector and the GraphQL Context object.
 
 It also means you gain a lot in terms of performance because the `Data` class is instantiated only once and used in many operations.
-
-<Callout>
-  `@ExecutionContext` impacts the performance, depending on your Node version
-  (execution context uses `async_hooks` module).
-
-GraphQL Modules is smart enough to enable `async_hooks` only when
-`@ExecutionContext` is used.
-
-</Callout>

packages/graphql-modules/src/application/execution-context.ts

@@ -317,8 +317,6 @@ export class MyProvider {
 
 In v0, we had a concept of Session to manage the execution of each operation. In v1, we dropped it, in favor of a simpler solution.
 
-Internally, we are using Node's `async_hooks` to manage a context of an execution, which allow us to share Injectables between Singleton and Operation scope.
-
 ## Context
 
 In v0, you could create a `context` per each module. In v1, `context` is external for GraphQL-Modules and it's not directly in use. You can do whatever you want with that, and just access it in GraphQL-Modules if you need, but we no longer require you to do specific things with your `context`.