gistfile1.js

var fs = require('fs');
var cheerio = require('cheerio');
var Chance = require('chance');
var chance = new Chance();

function getRandomData(type, hint) {
    if (type == 'number') {
        return (Math.random() * 1000000 | 0) / 100;
    } else if (type == 'boolean') {
        return Math.random() >= 0.5;
    } else {
        if (hint == 'name')
            return chance.name()
        if (hint == 'address')
            return chance.address()
        else
            return chance.word()
    }
}
function buildListModel(list, size, $, done) {
    var columns = [];
    list.each(function (n, e) {
        var elem = $(e);
        var bind = elem.attr('bind');
        var type = elem.attr('type');
        //console.log('e:', bind,type);
        var column = { bind: bind, type: type};
        columns.push(column);
    })
    var rows = [];
    for (var i = 0; i < size; i++) {
        var row = {};
        for (var j = 0; j < columns.length; j++) {
            row[columns[j].bind] = getRandomData(columns[j].type, columns[j].bind);
        }
        row.id = (Math.random()*10000)|0;
        rows.push(row);
    }
    done(rows);
}
function buildFormModel(form, $, done) {
    var model = {};
    form.each(function (n, e) {
        if (e.name=='form-section')
        $(e).children().each(function (n, e2) {
            var elem = $(e2);
            var bind = elem.attr('bind');
            if (bind) {
                if (bind.split('.')[0]=='data') bind = bind.split('.').slice(1).join('.');
             //   console.log("bind",bind,"for",e2)
                model[bind] = '';
            } else {
                console.log("Elemen of form section without bind:", e2.name);
            }
        });
    })
    done(model);
}
function buildForModel(model, size, done) {
    fs.readFile(model, function (err, data) {
        if (err) throw err;
        var $ = cheerio.load(data);
        var children = $('list-model').children();
        if (children.length != 0) return buildListModel(children,size, $, done);
        children = $('form-model').children();
        if (children.length != 0) return buildFormModel(children, $, done);
        else return done({unknown:true});
    });
}
/*
 buildForModel('view-models/list-model.html', function(data) {
 console.log(JSON.stringify(data));
 });*/
var cache = {};
function middleware(req, res, next) {
    var url = req.url;
    if (url.substr(0, 9) == '/samples/') {
        //var model = url.substr(9);
        var parts = url.substr(9).split('?');
        var model = parts.shift();
        //console.log("builind sample for ", model);
        var params = { size: 30 };
        parts.join('?').split('&').forEach(function(pair) {
            var pairs = pair.split('=');
            params[pairs[0]] = pairs[1];
        });

        var file = 'view-models/' + model + '-model.html';
        if (!fs.existsSync(file)) {
            res.statusCode = 404;
            res.end('Model not found');
            return;
        }
        res.setHeader('Content-Type', 'application/json');
        var stat = fs.statSync(file);
        if (cache[model] && cache[model].mtime.getTime() == stat.mtime.getTime()) {
            res.end(cache[model].data);
        } else
            buildForModel(file, params.size|0, function (data) {
                if (model) {
                    res.end(JSON.stringify(data));
                    cache[model] = {
                        data: JSON.stringify(data),
                        mtime: stat.mtime
                    };
                } else res.end("{}");
            });
    } else

        next();
}
module.exports = middleware;