AppFunc Middleware

A middleware or application method signature of all things IOPA

An IOPA application is simply a function(context, next) that we call an AppFunc. It provides a single REST-like IOPA context for each request, where it is easy to access all the HTTP/COAP parameters (path, method, body etc.). A next() function is typically provided to represent other processing that should occur on the same context record.

function(context, next)
{
// do something with context object
context.response.write('hello world');
// execute pipeline
return next();
}

Asynchronous Promises

Each AppFunc returns a tasks/ or promise to allow for asynchronous or event-based programming without “callback hell”, and for full compatibility with the upcoming ES7 async/await functionality, C# tasks etc.