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fh-mbaas-express-alpha

fh-mbaas-express

fh-mbaas-express is the FeedHenry MBaaS running on top of Express.

Usage

Add the following to the 'dependencies' section of your 'cloud/package.json' file:

"fh-mbaas-express" : "~3.0.0",
"fh-mbaas-api" : ~3.0.0"",
"express" : "~4.0.0"

Add a file to your FeedHenry app 'cloud/application.js', with the following contents:

var mbaas = require('fh-mbaas-express');
var express = require('express');
 
// Securable endpoints: list the endpoints which you want to make securable here 
var securableEndpoints = ['hello'];
 
var app = express();
 
// Note: the order which we add middleware to Express here is important! 
app.use('/sys', mbaas.sys(mainjs, securableEndpoints));
app.use('/mbaas', mbaas.mbaas);
 
// Note: important that this is added just before your own Routes 
app.use(mbaas.fhmiddleware());
app.use('/cloud', require('./lib/hello.js')());
 
 
// You can define custom URL handlers here, like this one: 
app.use('/', function(req, res){
  res.end('Your Cloud App is Running');
});
 
// Important that this is last! 
app.use(mbaas.errorHandler());
 
var port = process.env.FH_PORT || process.env.VCAP_APP_PORT || 8001;
var server = app.listen(port, function(){
  console.log("App started at: " + new Date() + " on port: " + port);
});

Customising & Extending

The above application.js is just an Expressjs application - it's easily extensible.

Custom APIs

You can create custom API handlers in the Express format by doing:

app.use('/myapi', function(req, res){
  res.end('My custom response');
});

See Express Router for more information.

Serving Static Files

Express has a built-in static file server. In this example, we host files under the public directory:

app.use(express.static(__dirname + '/public'));

REST API

Cloud

(POST | GET | PUT) /cloud/:someFunction

Authentication : Optional - can be enabled globally or on a per-endpoint basis under "Endpoints" section of the studio. Response formats : JSON, binary, plain text

Headers

x-fh-auth-app : API key of your application, found under the "details" section of the studio.

Body:

JSON format - paramaters to be passed to the exported function, see 'Writing API Functions'. ###Response: Result as passed to the callback function of the exported function - see 'Writing API Functions'.

Writing API functions

We recommend adding your own routes to /cloud, see lib/hello.js in the hello world example. . Also see Express Router for more information.

function helloRoute() {
  var hello = new express.Router();
  hello.use(bodyParser());
 
  // GET REST endpoint - query params may or may not be populated 
  hello.get('/hello', function(req, res) {
    var world = req.query ? req.query.hello : 'World';
 
    res.writeHead(200, {"Content-Type":"application/json"});
    res.end(JSON.stringify({msg: 'Hello ' + world}));
  });
  return hello;
}
 

mBaaS

POST /mbaas/db

Authentication : Required - App API key goes here. Response format : JSON

Headers

x-fh-auth-app : API key of your application, found under the "details" section of the studio.

POST Body:

JSON body - same as $fh.db params. A summary of body options follows - For more, see $fh.db docs

{
    "act": "create|update|list|delete|deleteall",
    "type": "collectionName",
    "guid": "GUID of object operating on - not required for list or deleteall",
    "fields": "JSON definition of fields - required for create|update",
    "eq|ne|in" : "JSON definition of query to match - supported for list only"
}

Response:

As per $fh.db

Sys

GET /sys/info/ping

Authentication : None Response formats : Plaintext

Headers

None

Response:

"OK"

if application is running as expected. Will respond with a 404 otherwise

GET /sys/info/endpoints

Authentication : None Response formats : JSON

Headers

None

Response:

{
  endpoints : ['array of endpoints exported as public functions']
}

GET /sys/info/memory

Authentication : None Response formats : JSON

Headers

None

Response:

{
  rss: 13721600, // Resident set size
  heapTotal: 7195904, // V8's total available memory
  heapUsed: 2369744  // V8's used memory
}

GET /sys/info/memory

Authentication : None Response formats : Plaintext

Headers

None

Response:

0.1.0

Backward compatability with main.js

If you want to use the older fh-nodeapp/fh-webapp style main.js, you need to change the /cloud endpoint in your application.js as follows:

var mainjs = require('./lib/main.js');
app.use('/cloud', mbaas.cloud(mainjs));

Additionally, you need to ammend the call to sys for secure endpoints:

app.use('/sys', mbaas.sys(securableEndpoints, mainjs));