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Merge pull request #12020 from nestjs/fix/throw-circular-custom-provi…
…ders fix(core): throw on circular factories and custom providers
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integration/injector/e2e/circular-custom-providers.spec.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| import { Test } from '@nestjs/testing'; | ||
| import { expect } from 'chai'; | ||
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| import { Controller, Injectable, Module } from '@nestjs/common'; | ||
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| class B {} | ||
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| @Injectable() | ||
| class A { | ||
| constructor(b: B) {} | ||
| } | ||
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| @Injectable() | ||
| class BImpl { | ||
| constructor(a: A) {} | ||
| } | ||
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| @Controller() | ||
| class AppController { | ||
| constructor(a: A) {} | ||
| } | ||
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| @Module({ | ||
| imports: [], | ||
| controllers: [AppController], | ||
| providers: [A, { provide: B, useClass: BImpl }], | ||
| }) | ||
| export class AppModule {} | ||
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| describe('Circular custom providers', () => { | ||
| it('should throw an exception (useClass + regular provider)', async () => { | ||
| try { | ||
| const builder = Test.createTestingModule({ | ||
| imports: [AppModule], | ||
| }); | ||
| await builder.compile(); | ||
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| expect(true).to.be.eql(false); | ||
| } catch (err) { | ||
| expect(err.message).to.be.eql( | ||
| 'A circular dependency has been detected inside "A". Please, make sure that each side of a bidirectional relationships are decorated with "forwardRef()". Note that circular relationships between custom providers (e.g., factories) are not supported since functions cannot be called more than once.', | ||
| ); | ||
| } | ||
| }); | ||
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| it('should throw an exception (2 factories)', async () => { | ||
| try { | ||
| const builder = Test.createTestingModule({ | ||
| providers: [ | ||
| { provide: 'ABC', useFactory: () => ({}), inject: ['DEF'] }, | ||
| { provide: 'DEF', useFactory: () => ({}), inject: ['ABC'] }, | ||
| ], | ||
| }); | ||
| await builder.compile(); | ||
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| expect(true).to.be.eql(false); | ||
| } catch (err) { | ||
| expect(err.message).to.be.eql( | ||
| 'A circular dependency has been detected inside "ABC". Please, make sure that each side of a bidirectional relationships are decorated with "forwardRef()". Note that circular relationships between custom providers (e.g., factories) are not supported since functions cannot be called more than once.', | ||
| ); | ||
| } | ||
| }); | ||
| }); |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /** | ||
| * SettlementSignal is used to signal the resolution of a provider/instance. | ||
| * Calling `complete` or `error` will resolve the promise returned by `asPromise`. | ||
| * Can be used to detect circular dependencies. | ||
| */ | ||
| export class SettlementSignal { | ||
| private readonly _refs = new Set(); | ||
| private readonly settledPromise: Promise<unknown>; | ||
| private settleFn!: (err?: unknown) => void; | ||
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| constructor() { | ||
| this.settledPromise = new Promise<unknown>(resolve => { | ||
| this.settleFn = resolve; | ||
| }); | ||
| } | ||
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| /** | ||
| * Resolves the promise returned by `asPromise`. | ||
| */ | ||
| public complete() { | ||
| this.settleFn(); | ||
| } | ||
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| /** | ||
| * Rejects the promise returned by `asPromise` with the given error. | ||
| * @param err Error to reject the promise returned by `asPromise` with. | ||
| */ | ||
| public error(err: unknown) { | ||
| this.settleFn(err); | ||
| } | ||
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| /** | ||
| * Returns a promise that will be resolved when `complete` or `error` is called. | ||
| * @returns Promise that will be resolved when `complete` or `error` is called. | ||
| */ | ||
| public asPromise() { | ||
| return this.settledPromise; | ||
| } | ||
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| /** | ||
| * Inserts a wrapper id that the host of this signal depends on. | ||
| * @param wrapperId Wrapper id to insert. | ||
| */ | ||
| public insertRef(wrapperId: string) { | ||
| this._refs.add(wrapperId); | ||
| } | ||
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| /** | ||
| * Check if relationship is circular. | ||
| * @param wrapperId Wrapper id to check. | ||
| * @returns True if relationship is circular, false otherwise. | ||
| */ | ||
| public isCycle(wrapperId: string) { | ||
| return this._refs.has(wrapperId); | ||
| } | ||
| } |