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Up until now fastlane tools made use of front-end web scraping. This means, the tools used a headless web browser to interact with the Apple Developer Portal and iTunes Connect. While this is an easy solution to get started, I quickly ran into the limits of web scraping.
More and more issues were caused by this technique: The tools were slow and the users got random timeout errors. When using web scraping, the tools would immediately break after front-end design changes of the websites.
It was time to implement a better solution: By replacing the headless web browser with a plain HTTP client it was possible to speed up sigh by 90% and make it much more stable at the same time.
This allowed us to stub all HTTP requests to write tests and detect newly introduced errors faster.
Instead of implementing the HTTP client right into the individual tools, I decided to separate the communication layer and put it into its own reusable Ruby gem. This allows every developer to make use of it.
You don't care about the communication and how it works. You can simply interact with Ruby objects (e.g. App, Certificate, ...) and the changes will automatically be pushed to the Dev Center.
There is a pre-release version of sigh available to try, check out the announcement to upgrade.
If you want to try spaceship directly, check out the spaceship Project page with a very easy to follow documentation on how to use it. You'll have to install spaceship first before you can start irb (Interactive Ruby Shell).