Book Image

D Web Development

By : Kai Nacke
Book Image

D Web Development

By: Kai Nacke

Overview of this book

D is a programming language with C-like syntax and static typing. The vibe.d framework builds on powerful D concepts like template meta-programming and compile-time function execution to provide an easy-to-use environment for web applications. The combination of a feature-rich web programming framework with a language compiling to native code solves two common issues in web development today: it accelerates your development and it results in fast, native web applications. Learning the vibe.d framework before you start your application will help you to choose the right features to reach your goal. This book guides you through all aspects of web development with D and the vibe.d framework. Covering the popular operating systems today, this guide starts with the setup of your development system. From the first Hello World-style application you will move on to building static web pages with templates. The concise treatment of web forms will give you all the details about form handling and web security. Using the abstractions of the web framework you will learn how to easily validate user input. Next, you will add database access to your application, providing persistent storage for your data. Building on this foundation, you will expose your component and integrate other components via REST. Learning about the internals of vibe.d you will be able to use low-level techniques such as raw TCP access. The vibe.d concepts can also be used for GUI clients, which is the next topic that you will learn. vibe.d is supported by an active community, which adds new functionality. This comprehensive guide concludes with an overview of the most useful vibe.d extensions and where to find them. It also shows you how to integrate these extensions in your application. The concepts are always illustrated with source code, giving you an insight into how to apply them in your application.
Table of Contents (17 chapters)
D Web Development
About the Author
About the Reviewers

Performing background work

Some tasks are better performed in the background than in a request-response cycle. Depending on the type of work, you can use a fiber-based task or thread.

Running a fiber-based task

A function or method that returns void can be started as a fiber-based task with the runTask() function. The parameters are the delegates (use std.functional.toDelegate() if you have a function) and possible parameters.


Do not forget to be cooperative in your fiber: call a pseudo-blocking function or yield() from time to time.

You can use such a background task to collect data about the server. With the next example, you can read the /proc/loadavg file on Linux and collect the data of the last 10 minutes. On a request from a client, you send some JavaScript code to paint the graph of the values. The code uses the sleep() function that triggers the switch to the event loop. Collecting the data is very lightweight but the timing is very inaccurate. You should not expect to see a perfect...