Replacing SRAS

Zetamex Network has been a big user of SRAS for a long time. We didn’t make the switch to FSAssets due to the performance to system resource usage was still much higher than that of SRAS. Since the most recent releases of many mainstream Linux distributions it is becoming more and more noticeable that SRAS is showing its age. We had already been using software to allow for SRAS to run on older versions of its dependencies in order to get it to work at all.

We realized this was just not cutting it anymore, and we really needed something new to replace the outdated SRAS and make sure that we could support it for the future to come. Reaching out to freelancers to assist us in the project in converting or rewriting something backwards compatible to SRAS, as FSAssets is not directly backwards compatible but could be migrated with some effort. After shopping around for freelancers we came upon one already deep inside the OpenSimulator community who has done custom work for other grids, with whom we have worked with in the past on a few smaller projects for some of our clients.

We decided on to use PHP for the replacement, as we have already built almost the entire Zetamex Network back-end on it. Furthermore, we made sure it was built without relying on any dependencies other than PHP itself. This made it slim, lightweight and easy to future proof by having it all written from scratch for easy upgrades in the future. The development took a while, but this past week it has been rolled out and is running on all hosted and managed Zetamex Network grids. The name of it is phpSAS (PHP Simple Asset Service), close to the same naming of SRAS (Simple Ruby Asset Service).

What makes it different is that we run it on the latest version of PHP, PHP 7, which is the fastest version of PHP to date. The proxy layer for serving assets and handling the load is NGINX
making it even faster at storing assets and allowing it to serve thousands of requests without causing any major load spikes. Best of all, we are now able to load balance the asset server like never before as assets are served just like a website would be. This means we can put it behind large CDN providers with minimal effort, which is our next project for this.

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