Friday, August 24, 2018

Open Sourcing Twitter Network Layer

Nolan O’Brien:

In 2014, iOS 7 was released with the new NSURLSession API for networking to replace NSURLConnection (which ended up being deprecated in iOS 9). At Twitter, we wanted to modernize our original network code and design something scalable and robust that would last at least the next 10 years. We took that opportunity to assess the drawbacks of the system we had in place and enumerated all the possible improvements we could build in an encapsulated framework that was modern and scalable.

Twitter Network Layer (TNL) was first built in 2014 and over the course of the next two years, we transitioned everything over to TNL while iterating on the framework. TNL has now been in production for 4 years, 100% adopted for over 2 years, and has had no bugs identified in the last 18 months.


There is an additional benefit of having TNL abstract away NSURLSession instances, which is an automatic performance gain of reducing the number of NSURLSessions that would need to be created.

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