refactored how to detect cloud providers

app.js

@@ -1,23 +1,19 @@
 'use-strict'
 
+require('dotenv').config()
+
 var express       = require('express')
 var bodyParser    = require('body-parser')
 var sessions      = require('express-session')
 var compression   = require('compression')
+var { isRunningOnHeroku } = require('./util-cloud-provider')
 
 /* check if the application runs on heroku */
-var util
-
-if (process.env.DYNO) {
-	util = require('./util-pg.js')
-
-	// check if configuration exists, if not create it
-	util.validateConfiguration((error) => {
-		if (error) {
-			require('./setup-database')
-		}
-	})
+let util
 
+if (isRunningOnHeroku()) {
+	util = require('./util-heroku-pg.js')
+	util.createConfigurationIfNotExists()
 } else {
 	util = require('./util-file.js')
 }
@@ -72,6 +68,7 @@ app.use(function (req, res, next) {
 	util.getConfiguration(function (err, configuration) {
 		if (err) {
 			res.status(500).json({stack: err.stack, message: err.message})
+
 		} else {
 			req.configuration = configuration
 			req.util = util

util-cloud-provider.js

@@ -0,0 +1,12 @@
+const isRunningOnHeroku = () => {
+	return (process.env.DYNO) ? true : false
+}
+
+const isRunningOnGoogle = () => {
+	return (process.env.GAE_ENV === 'standard')
+}
+
+module.exports = {
+	isRunningOnHeroku,
+	isRunningOnGoogle
+}

util-pg.js → util-heroku-pg.js

@@ -1,7 +1,34 @@
 const { Client } = require('pg')
-const { convertToString, generateSessionExirationDate } = require('./util-common.js')
+const { readConfigurationFromFile } = require('./util-file')
+
+const createConfigurationIfNotExists = () => {
+
+	hasConfiguration((error) => {
+		if (error) {
+			const client = createClient()
+
+			client.connect().then(() => {
+				return createTableIfNotExists(client)
+			}).then((result) => {
+				return truncateTable(client)
+			}).then((result) => {
+				return readConfigurationFromFile()
+			}).then((configurationAsString) => {
+				return writeConfiguration(client, configurationAsString)
+			}).then((result) => {
+				console.log('table successfully created, configuration saved')
+				process.exit(0)
+			}).catch((error) => {
+				console.log(error)
+				process.exit(1)
+			}).then(() => client.end())
 
-const validateConfiguration = (callback) => {
+		}
+	})
+
+}
+
+const hasConfiguration = (callback) => {
 	const client = createClient()
 
 	client.connect().then(() => {
@@ -83,14 +110,7 @@ const readConfiguration = (client) => {
 }
 
 module.exports = {
-	convertToString,
-	generateSessionExirationDate,
-	createClient,
-	createTableIfNotExists,
-	truncateTable,
-	writeConfiguration,
-	readConfiguration,
+	createConfigurationIfNotExists,
 	getConfiguration,
-	setConfiguration,
-	validateConfiguration
+	setConfiguration
 }