dm-worker

Worker

Usage

1. In project root create worker.js:

   const conf = require('nconf')
   require('dm-sharedb-server/nconf')
   
   const path = require('path')
   
   // full path to workerActions.js and workerInit.js
   process.env['WORKER_ACTIONS_PATH'] = path.join(process.cwd(), './build/workerActions.js')
   process.env['WORKER_INIT_PATH'] = path.join(process.cwd(), './build/workerInit.js')
   
   const TaskDispatcher = require('dm-worker')
   const dispatcher = new TaskDispatcher()
   
   dispatcher.start().catch((err) => {
     console.log('Error starting worker', err)
   })

2. In project root create workerInit.js. Do any initializations here (plug in hooks, ORM, etc.). Since this file may be compiled by webpack, use global.DM_WORKER_INIT instead of module.exports:

   import 'dm-sharedb-server/nconf'
   import ShareDB from 'sharedb'
   import richText from 'rich-text'
   import Racer from 'racer'
   import derbyAr from 'derby-ar'
   import ormEntities from './model'
   import shareDbHooks from 'sharedb-hooks'
   import hooks from './server/hooks'
   
   let init = global.DM_WORKER_INIT = function (backend) {
     // Register rich-text type in ShareDB
     ShareDB.types.register(richText.type)
   
     // Init ORM
     Racer.use(derbyAr)
     Racer.use(ormEntities)
     shareDbHooks(backend)
     hooks(backend)
   }

3. In project root create workerActions.js. Put your tasks here (name of functions are the name of tasks). Since this file may be compiled by webpack, use global.DM_WORKER_ACTIONS instead of module.exports:

   let ACTIONS = global.DM_WORKER_ACTIONS = {}
   
   ACTIONS.test = function (model, task, done) {
     console.log('>> Start test task', task.id)
     setTimeout(() => {
       console.log('>> Finish test task', task.id)
       done()
     }, 5000)
   }

4. Add worker, workerInit, workerActions to webpack.config.js of dm-react-webpack:

   module.exports = {   
     // ...
   
     backendApps: {
       server: path.join(__dirname, 'server'),
       worker: path.join(__dirname, 'worker'),
       workerActions: path.join(__dirname, 'workerActions'),
       workerInit: path.join(__dirname, 'workerInit')     
     }
   
     // ...   
   }

MIT Licence

Copyright (c) 2022 Decision Mapper