Stackware is a basic connect-style middleware handler for node.js, used for pushing objects through a list of functions, modifying them and handling errors.
npm install stackware
var Stackware = require('stackware');
var sw = new Stackware();
sw.use(function middleware1(obj1, obj2, next) {
obj1.foo = 'bar';
next();
});
sw.use(function middleware2(obj1, obj2, next) {
obj2.bar = 'foo';
// stop here
});
sw.process(obj1, obj2);Create a Stackware object.
var Stackware = require('stackware');
var sw = new Stackware();Add a middleware to the stack. It can be either a function or an object providing a handle function. It will be called with the same arguments given to process (see below), plus a callback function which can take an error.
function Middleware() {}
Middleware.prototype.handle = function (obj1, obj2, next) { next(); };
// Object with handle function
sw.use(new Middleware());
// Function
sw.use(function (obj1, obj2, next) {
obj1.foo = 'bar';
next();
});
sw.process(obj1, obj2);When the callback is called with an error, further middlewares will be skipped until we reach an error handler. It's basically a middleware with an error argument prepended to the others.
sw.use(function middleware1(obj, next) {
next(new Error('Something happened'));
});
sw.use(function errorHandler(err, obj, next) {
console.log(err);
});
sw.process(obj);Push any number of objects through the middlewares.
NB: only variables passed by reference can be changed inside the middlewares (i.e. objects, arrays).
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