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Oracle Drags Its Feet in the JavaScript Trademark Dispute
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Aldo-application
is an object containing a stack of middleware functions which are composed and executed upon each HTTP request.
const { Application } = require('aldo')
const app = new Application()
// add a request handler
app.use(() => 'Hello world!')
// create a HTTP server to serve the application
app.start(process.env.PORT)
Middlewares could be a common or an async function.
Each function receives a request context and a next
function to call the downstream middlewares, and must return a response as output.
// Handler function signature
declare type Middleware = (ctx: Context, next: () => any) => any;
You can register as many middlewares as needed with the application's method .use(fn)
// to add a handler directly in the stack
app.use(middleware)
Whether a middleware runs before or after a downstream middlewares depends on the middleware itself. For example, the following middleware would perform some task before the others
app.use((ctx, next) => {
// Perform task
return next()
})
However, this middleware would perform its task after the request is handled by the following middlewares
app.use(async (ctx, next) => {
let response = await next()
// Perform task
return response
})
The context object is a simple plain object with these properties:
request
refers to the incoming request objectresponse
function to get a new Response
instance each time called.set(key, value)
or .bind(key, getter)
declare interface Context {
request: Request;
response: ResponseFactory;
[key: string]: any;
}
To extend the request context, and add shared properties, like a DB connection or a global logger, you may use .set(key, value)
const mongoose = require('mongoose')
await mongoose.connect('mongodb://localhost/test')
app.set('db', mongoose)
To set a per request private properties, you may use .bind(key, getter)
. This method takes a field name, and a function to be used as a lazy
getter of the field value.
app.bind('session', () => new Session(options))
This method is very useful, since it allows you to lazily (only when needed) attach a per request property into the context without adding a dedicated handler.
.has(key)
and .get(key)
are aldo available to check the existence of a certain field or to get a previously defined field value.
The middleware output could be:
strings
or buffers
sent directlystreams
which will be piped to the outgoing responsenull
or undefind
as empty responses (By default with 204 status code)Response
instances which can be created with the context response
propertyJSON
, with the proper Content-Type
and Content-Length
FAQs
Fast micro framework for Node.js 8+
We found that aldo demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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