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server.js
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server.js
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const express = require('express');
const handlebars = require('express-handlebars'); // templating
const path = require('path');
const fspromise = require('fs-promise');
const application = express();
/**
* Server definition files
*/
const definitionFiles = {
root: "static/definitions",
common: "common-definitions.json",
backend: "backend-definitions.json",
servicesRoot: "services"
};
// 1 - Serve static resources (index.html)
application.use('/', express.static(path.join(__dirname, 'static/client')));
// 2 - Serve definitions as definitions file concatenation (so that the client emits only one request)
application.get('/definitions', function (req, res) {
// 1 - list files in services definition folder
let servicesRoot = `${definitionFiles.root}/${definitionFiles.servicesRoot}`;
fspromise.readdir(servicesRoot).then(files => {
// prepare files to read
let serviceFiles = files
.filter(fileName => fileName.match(/.*\.json/))
.map(fileName => `${servicesRoot}/${fileName}`);
let filesToLoad = [
`${definitionFiles.root}/${definitionFiles.common}`,
`${definitionFiles.root}/${definitionFiles.backend}`,
].concat(serviceFiles);
// read all
Promise.all(filesToLoad.map(filePath => fspromise.readFile(filePath)))
.then(loadedFiles => {
let asJSONObjects = loadedFiles.map(content => JSON.parse(content));
let responseObject = (([commonDefinitions, backendDefinition, ...serviceDefinitions]) => {
// bundle the object together
let responseObject= {};
Object.assign(responseObject, commonDefinitions);
Object.assign(responseObject, backendDefinition);
responseObject.services = serviceDefinitions;
return responseObject
})(asJSONObjects);
res.send(responseObject);
}).catch(e => {
console.error(e);
sendErrorMessage(500, res, "The server failed loading definition files. Please check server resources");
});
}).catch(e => {
console.error(e);
sendErrorMessage(500, res, "The server failed listing service definition files. Please check server resources");
});
/*Promise.all([
fspromise.readFile('static/definitions/')
]).then(([commonDefinitionData]) => {
res.send(commonDefinitionData).end();
}).catch(() =>
*/
});
function sendErrorMessage(code, res, message) {
res.writeHead(code, message, {'content-type': 'text/plain'});
res.end(message);
};
// 3 - Post interface to distant services
// TODO
// 4 - handle standard error cases (last middleware, to be used when no other matched)
application.engine('handlebars', handlebars({layout: false}));
application.set('view engine', 'handlebars');
application.set('views', 'static/client/templates');
application.use(function (request, response, next) {
response.status(404).render('error.handlebars', {
title: 'Page not found',
detail: `404 - Page at "${request.originalUrl}" could not be found`
});
});
// 5 - start server
application.listen(process.env.PORT || 8080);