Class TracingInterceptor

examples/context/src/interceptor-proxy.ts:36–70

const GREETER = BindingKey.create<Greeter>('greeter');

@injectable(asGlobalInterceptor('tracing'))
class TracingInterceptor implements Provider<Interceptor> {
  constructor(
    @inject(REQUEST_ID_GENERATOR) private generator: RequestIdGenerator,
  ) {}

  value() {
    return this.intercept.bind(this);
  }

  async intercept<T>(
    invocationCtx: InvocationContext,
    next: () => ValueOrPromise<T>,
  ) {
    const reqCtx = invocationCtx.getSync(REQUEST_CONTEXT);
    let reqId = await reqCtx.get(REQUEST_ID, {optional: true});
    if (!reqId) {
      reqId = this.generator(reqCtx);
      // We need to set request id to `reqCtx` as `invocationCtx` is transient
      reqCtx.bind(REQUEST_ID).to(reqId);
      console.log(
        'Adding request id at %s: %s',
        invocationCtx.targetName,
        reqId,
      );
    } else {
      console.log(
        'Request id found at %s: %s',
        invocationCtx.targetName,
        reqId,
      );
    }
    return next();
  }
}

class Converter {
  toUpperCase(name: string) {