fastify/lib/wrapThenable.js

Fast and low overhead web framework, for Node.js

'use strict'

function wrapThenable (thenable, reply) {
  thenable.then(function (payload) {
    if (reply._sentOverwritten === true) {
      return
    }

    // this is for async functions that
    // are using reply.send directly
    if (payload !== undefined || (reply.res.statusCode === 204 && reply._sent === false)) {
      // we use a try-catch internally to avoid adding a catch to another
      // promise, increase promise perf by 10%
      try {
        reply.send(payload)
      } catch (err) {
        reply._sent = false
        reply._isError = true
        reply.send(err)
      }
    } else if (reply._sent === false) {
      reply.res.log.error({ err: new Error(`Promise may not be fulfilled with 'undefined' when statusCode is not 204`) }, `Promise may not be fulfilled with 'undefined' when statusCode is not 204`)
    }
  }, function (err) {
    if (reply._sentOverwritten === true) {
      reply.res.log.error({ err }, 'Promise errored, but reply.sent = true was set')
      return
    }
    reply._sent = false
    reply._isError = true
    reply.send(err)
  })
}

module.exports = wrapThenable