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server.js
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server.js
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#! /usr/bin/env node
// @flow
const path = require('path')
const express = require('express')
const bodyParser = require('body-parser')
const app = express()
app.use(bodyParser.json({ limit: '50mb' }))
const findit = require('findit')
const getPort = require('get-port')
const open = require('open')
const updateNotifier = require('update-notifier')
const pkg = require('./package.json')
updateNotifier({
pkg,
updateCheckInterval: 1000 * 60 * 60 * 24 // one day
}).notify()
const fs = require('fs')
const argv = require('yargs')
.usage('This is my awesome program\n\nUsage: $0 [options]')
.help('help').alias('help', 'h')
.options({
source: {
alias: 's',
description: '<filename> A json file in native rasa-nlu format',
requiresArg: true,
},
port: {
alias: 'p',
description: '<port> Port to listen on',
requiresArg: true,
},
development: {
alias: 'd',
}
})
.default({
source: null,
port: null,
development: false,
})
.argv
const sourceFile = {
path: '',
data: {},
isLoaded: false,
}
function readData(path) {
return new Promise((resolve, reject) => {
fs.readFile(path, 'utf8', (error, raw) => {
let json
if (error) {
return reject(`Can't read file "${path}"\n${error}`)
}
try {
json = JSON.parse(raw)
}
catch (error) {
return reject(`Can't parse json file "${path}"\n${error}`)
}
if (!json.rasa_nlu_data) {
return reject('"rasa_nlu_data" is undefined')
}
resolve(json)
})
})
}
if (argv.source) {
readData(argv.source)
.then(data => {
sourceFile.data = data,
sourceFile.path = argv.source
sourceFile.isLoaded = true
serve()
})
.catch(error => {
throw error
})
}
else {
console.log('searching for the training examples...')
let isSearchingOver = false
let inReading = 0
function checkDone() {
if (isSearchingOver && inReading === 0) {
if (!sourceFile.isLoaded) {
throw new Error(`Can't find training file, please try to specify it with the --source option`)
}
else {
serve()
}
}
}
const finder = findit(process.cwd())
finder.on('directory', function (dir, stat, stop) {
var base = path.basename(dir)
if (base === '.git' || base === 'node_modules') stop()
})
finder.on('file', function (file) {
if (file.substr(-5) === '.json' && !sourceFile.isLoaded) {
inReading++
readData(file)
.then(data => {
if (!sourceFile.isLoaded) { // an other file could have been loaded in the meantime
sourceFile.data = data,
sourceFile.path = file
sourceFile.isLoaded = true
console.log(`found ${file}`)
}
})
.catch(() => {})
.then(() => {
inReading--
checkDone()
})
}
})
finder.on('end', function () {
isSearchingOver = true
checkDone()
})
}
function serve() {
// app.use(express.static('./build'))
app.use(express.static(path.join(__dirname, './build')))
if (process.env.NODE_ENV !== 'production') {
//the dev server is running on an other port
app.use(function(req, res, next) {
res.header('Access-Control-Allow-Origin', '*')
res.header('Access-Control-Allow-Headers', 'Origin, X-Requested-With, Content-Type, Accept')
next()
})
}
if (!argv.development) {
app.get('/', function (req, res) {
res.sendFile(path.join(__dirname, './build', 'index.html'))
})
}
app.post('/data', function (req, res) {
res.json({
data: sourceFile.data,
path: sourceFile.path,
})
})
app.post('/save', function (req, res) {
const data = req.body
if (!data || !data.rasa_nlu_data) {
res.json({error: 'file is invalid'})
}
fs.writeFile(sourceFile.path, JSON.stringify(data, null, 2), (error) => {
if (error) {
return res.json({error})
}
readData(sourceFile.path)
.then(json => sourceFile.data = json)
.catch(error => console.error(error))
.then(() => res.json({ok: true}))
})
})
if (argv.port) {
listen(argv.port)
}
else {
getPort().then(port => listen(port))
}
function listen(port) {
app.listen(port)
if (!argv.development) {
const url = `http://localhost:${port}/`
console.log(`server listening at ${url}`)
open(url)
}
else {
console.log('dev server listening at', port)
}
}
}