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      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.
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How to keep track of sessions in HTTP requests

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Hi!

I Hope that ok to ask another thing in this topic, I thought that its stupid to start a new topic...

 

Do you have any idea how can I keep track on which user is logged to the server - In a PHP server so I dont have consistent connection, keeping in mind that maybe the game client crashed or something so I cant trust that a logout command has been sent to the PHP server?

 

My server is pretty much done other then that thing

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Actually, I split this to a separate topic, because it's a different question!

 

Generally, when dealing with sessions, you use a data store with timeout or time-to-live of some sort. Examples include memcached, Redis, or Cassandra.

For HTTP, when a user logs in, you create a new session and identify it with a session ID. Use a strong random number and verify that it's not already existing. Store information about the session in your data store, and store the session ID in a cookie in the browser.

When you receive HTTP requests with a session ID cookie, look up that ID in your data store; if it's still there, the session is valid.

The session ID needs to be hard to guess, and you need to have billions more session IDs than you have active sessions to defend against guessing attacks, but that's easy with a 128 or even 256 bit strong random number as your session ID, coupled with not allowing more than a dozen bad logins or bad sessions from the same source IP in some amount of time (say, 5 minutes.)

 

PHP specifically has some session management built in. By default, it just stores the data in a local file, so it only works on a single machine; you can extend it to use memcached or whatever once your service outgrows a single server. But it's also pretty reasonable to build your own as described above.

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