sequence.ts

sequence.example.ts

interface Envelope {
  writeToResponse() 
}

class File extends Envelope {
  writeToResponse(res) {
    res.setHeader('content-type', this.getContentType())
    this.readableStream.pipe(res)
  }
}

class MySequence {
  constructor(
    public @injectInvoke() invoke,
    public @injectAuthenticate() authenticate,
    public @injectAuthorize() authorize,
    public @injectWrite() write,
    public @injectParseArgs() parseArgs,
    public @injectAuthorize() reject,
    public @injectAuthorize() findRoute) {}
  write(env : Envelope) {
    // this is the impl of `write()`
    return env.writeToResponse(this.res)
  }
  async run(request, response) {
    try {
      const {controllerName, methodName, spec, pathParams} = this.findRoute(request);
      const args = this.parseArgs(spec, request, pathParams);

      const user = await this.authenticate(request);
      await this.authorize(controllerName, methodName, args, user);
 
      const result = await this.invoke(controllerName, methodName, args, user);
      await this.write(result);
    } catch(err) {
      await this.reject(err);
    }
  }
}