@sap/cds-dk/lib/watch/watched.js

Command line client and development toolkit for the SAP Cloud Application Programming Model

//
// Child process impl launched by cds watch
// Extracted from watch.js to avoid cds.env loaded too eagerly
//

(async () => {

  // run through cli in order to use its error handling
  const args = JSON.parse(process.env._args)
  const cds = require('../cds'); cds.watched = true
  const bootstrap = require('../../bin/cds')(...args)

  cds.once('listening', async ({ server }) => {
    process.send({ code: 'listening', port: server.address().port })
    if (process.env.CDS_WATCH_HOT_RELOAD && process.env.CDS_WATCH_HOT_RELOAD !== 'false') {
      const hotReload = require('./hot-reload');
      await hotReload()
    }
  })

  try {
    await bootstrap
    if (cds.service.providers.length === 0) return _no_services_found()
  } catch (e) { switch (e.code) {
    case 'NO_SERVICES_FOUND': return _no_services_found(e)
    case 'MODEL_NOT_FOUND': return _no_models_found(e)
    case 'EADDRINUSE': return process.send(e)  //> tell cds watch
    default: if (e.messages?.length) return cds._log(e.messages, { 'log-level': cds.env.log.levels.cli }) // REVISIT: no special handling for compiler messages
             else console.error('\n❗️ ERROR on server start: ❗️\n\n', e)
  }}

  function _no_models_found(e) { console.log (`
    No models found in ${(e.files||cds.resolve(e.model||'*',false)).filter(f => !(f in {schema:1,services:2}))}.
    Waiting for some to arrive...
  `)}

  function _no_services_found() { console.log (`
    No service definitions found in loaded models.
    Waiting for some to arrive...
  `)}

})()