fastify/lib/wrapThenable.js

Fast and low overhead web framework, for Node.js

'use strict'

const {
  kReplyIsError,
  kReplyHijacked
} = require('./symbols')

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

    // this is for async functions that
    // are using reply.send directly
    if (payload !== undefined || 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[kReplyIsError] = true
        reply.send(err)
      }
    }
  }, function (err) {
    if (reply.sent === true) {
      reply.log.error({ err }, 'Promise errored, but reply.sent = true was set')
      return
    }

    reply[kReplyIsError] = true
    reply.send(err)
  })
}

module.exports = wrapThenable