Noodling with Promise usage.

promised-controllers.js

async function asyncRead(inputId) {
  var id = await inputId // Awaiting here makes function usable with sync or async inputs
  // Do some async action that returns a promise
  return Promise.resolve({id})
}

async function asyncWrite(inputModel) {
  var model = await inputModel
  // Do some async action that returns a promise
  return Promise.resolve()
}

// Usage
//
async function endpoint(req, res, next) {
  try {
    var id = req.params.id // sync input
    var model = await asyncRead(id)
    var result = await asyncWrite(model) // async (Promise) input
    res.send(201)
  } catch (e) {
    res.status(500).json({error: e.message})
  }
}