async-stack
Async-to-sync queue stack process management - the simplest way possible.
Install: npm install async-stack
Usage:
// ADD THE MODULE
var asyncstack = require("async-stack"), // A Class allowing multiple independent instances.
Stack = new asyncstack(), // this instance of 'asyncstack'.
self = this,
self.sql = {};
// BUILD THE STACK
Stack.push(
function(){
// On this one, don't call 'next()' until end of inside the mysql callback!
mysql.query('select some_data from some_table', function(err, result, fields){
if (err) { throw err; return; }
// Make the result accessible to the rest of this page
self.sql.sql1 = result;
// This would be something like:
// {
// companyname: 'Stack Devs, LLC',
// firstname: 'John',
// lastname: 'Smith',
// }
// NOTE: We passed 'false' 2nd param to Stack.push()
// Manually call next now that we are ready.
Stack.next();
});
}
,false // Passing second param [false] prevents auto-call of .next(), now it must be called manually!
);
Stack.push(
function(){
// Header
var header_html = "<!DOCTYPE html><html><head></head><body><header><div class="bold"><span class="data_companyname">{{companyname}}</span></div><br /><br />Welcome, <span class="data_firstname">{{firstname}}</span></header><section>"; // Get/Set your hearder html somehow
// Then parse/template/dynamic content from sql1 into the html
// ...
// ...
response.write(header_html);
}
);
Stack.push(
function(){
// body content
var body_html = "<b>This would be page header content!</b>"; // Get/Set your hearder html somehow
// then parse/template/dynamic content with some middleware to insert data from sql1 into the html
response.write(body_html);
}
);
Stack.push(
function(){
// Footer
var footer_html = "</section><footer>©<span class="data_companyname">{{companyname}}</span> All rights reserved. "; // Get/Set your hearder html somehow
// Then parse/template/dynamic content from sql1 into the html
// ...
// ...
response.write(footer_html);
}
);
Stack.pushfinish(
function(){
response.end();
}
);
// NOTES:
// There are two additional features, following traditional array handling:
// 'unshift()' = pre-pend a function to the front/top of the main stack
// 'unshiftfinish()' = pre-pend a function to the front/top of the finish stack
// Read the asycn-stack.js code for a number of additional accessors to get the stask lengths,
// the current index, isstarted, and isfinished flags of your stack.
// Make it all happen!
// Trigger the Stack calls
Stack.start();
// Now, go make it better.