fix(core): merge request context with tenant context payload in the request singleton

[DylanVeldra]

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• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

Doesn't create the request singleton with the contextId payload when the first request isn't to a durable tree.

Issue Number: #13477

What is the new behavior?

The payload generated by the contextIdFactory will be always merged to the request singleton, not matter if the the tree is durable or not.

Does this PR introduce a breaking change?

• Yes
• No

Other information

I would like to know which tests should I updated, if needed.

Also the patch doesn't merge payload from the contextIdFactory in the request passed to canActivate method for AuthGuard and exception filter.

To patch the case above:

packages/core/router/router-explorer.ts lines 389 and 402

  public createRequestScopedHandler(
    instanceWrapper: InstanceWrapper,
    requestMethod: RequestMethod,
    moduleRef: Module,
    moduleKey: string,
    methodName: string,
  ) {
    const { instance } = instanceWrapper;
    const collection = moduleRef.controllers;

    const isTreeDurable = instanceWrapper.isDependencyTreeDurable();

    return async <TRequest extends Record<any, any>, TResponse>(
      req: TRequest,
      res: TResponse,
      next: () => void,
    ) => {
      try {
        const contextId = this.getContextId(req, isTreeDurable);
        const contextInstance = await this.injector.loadPerContext(
          instance,
          moduleRef,
          collection,
          contextId,
        );
        await this.createCallbackProxy(
          contextInstance,
          contextInstance[methodName],
          methodName,
          moduleKey,
          requestMethod,
          contextId,
          instanceWrapper.id,
        )(req, res, next);
      } catch (err) {
        let exceptionFilter = this.exceptionFiltersCache.get(
          instance[methodName],
        );
        if (!exceptionFilter) {
          exceptionFilter = this.exceptionsFilter.create(
            instance,
            instance[methodName],
            moduleKey,
          );
          this.exceptionFiltersCache.set(instance[methodName], exceptionFilter);
        }
        const host = new ExecutionContextHost([req, res, next]);
        exceptionFilter.next(err, host);
      }
    };
  }

..., instanceWrapper.id, )(req, res, next);

should be replace by

..., instanceWrapper.id, )(Object.assign(req, contextId.payload), res, next);

and

const host = new ExecutionContextHost([req, res, next]);

should be replace by

const host = new ExecutionContextHost([Object.assign(req, contextId.payload), res, next]);

But I don't want to do it on my own since I would like a quick fix first, moreover maybe it will imply edge-case, I don't know the code base well 🤷‍♂️

[coveralls]

Pull Request Test Coverage Report for Build e79cdc3c-762e-40cd-acb3-21e17deb1cd9

Details

• 1 of 2 (50.0%) changed or added relevant lines in 2 files are covered.
• 74 unchanged lines in 13 files lost coverage.
• Overall coverage decreased (-0.09%) to 92.124%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/core/router/router-explorer.ts	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
packages/core/router/router-explorer.ts	1	83.2%
packages/common/pipes/parse-uuid.pipe.ts	1	95.45%
packages/core/router/sse-stream.ts	1	96.77%
packages/core/scanner.ts	2	88.46%
packages/microservices/server/server-redis.ts	3	95.77%
packages/microservices/server/server.ts	4	92.19%
packages/microservices/server/server-kafka.ts	5	94.78%
packages/microservices/server/server-mqtt.ts	6	91.76%
packages/microservices/server/server-tcp.ts	6	89.47%
packages/microservices/client/client-nats.ts	8	89.47%

Totals
Change from base Build ce4d7ee2-3275-4dce-b5f8-4b602a80cf12:	-0.09%
Covered Lines:	6737
Relevant Lines:	7313

---

💛 - Coveralls

[kamilmysliwiec]

Also the patch doesn't merge payload from the contextIdFactory in the request passed to canActivate method for AuthGuard and exception filter.

This isn't required anyway

[benjGam]

Won't introduce any side effects ?

[DylanVeldra]

I will take care of tests this week.

[DylanVeldra]

I added an integration test @kamilmysliwiec let me know what do you think about it