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Mozilla: Rust, Async, Treeherder

Submitted by Roy Schestowitz on Tuesday 24th of December 2019 05:01:34 AM Filed under
Moz/FF
  • What’s the point: New Rust, Terraform tweaks, CFEngine revs

    The Rust team have released v1.40.0 of the programming language. The team have flagged up a number of key improvements, including the addition of an attribute, #[non_exhaustive], which when attached to a struct or the variant of an enum, “will prevent code outside of the crate defining it from constructing said struct or variant”. Macros and attributes have been given a general scrub up, and a series of functions and macros have been stabilised and added to the standard library.

  • Async Interview #3: Carl Lerche

    One of the first things we talked about was a kind of overview of the layers of the “tokio-based async stack”.

    We started with the mio crate. mio is meant to be the “lightest possible” non-blocking I/O layer for Rust. It basically exposes the “epoll” interface that is widely used on linux. Windows uses a fundamentally different model, so in that case there is a kind of compatibility layer, and hence the performance isn’t quite as good, but it’s still pretty decent. mio “does the best it can”, as Carl put it.

    The tokio crate builds on mio. It wraps the epoll interface and exposes it via the Future abstraction from std. It also offers other things that people commonly need, such as timers.

    Finally, bulding atop tokio you find tower, which exposes a “request-response” abstraction called Service. tower is similar to things like finagle or rack. This is then used by libraries like hyper and tonic, which implement protocol servers (http for hyper, gRPC for tonic). These protocol servers internally use the tower abstractions as well, so you can tell hyper to execute any Service.

  • Reducing Treeherder’s time to-deploy

    If a regression was to be found on production we would either `git revert` a change out of all merged changes OR use Heroku’s rollback feature to the last known working state (without using Git).

    Using `git revert` to get us back into a good state would be very slow since it would take 15–20 minutes to run through Travis, a Heroku build and a Heroku release.

    On the other hand, Heroku’s rollback feature would be an immediate step as it would skip steps 1 and 2. Rolling back is possible because a previous build of a commit would still be available and only the release step would be needed .

    The procedural change I proposed was to use Heroku’s promotion feature (similar to Heroku’s rollback feature). This would reuse a build from the staging app with the production app. The promotion process is a one-click button event that only executes the release step since steps 1 & 2 had already run on the staging app. Promotions would take less than a minute to be live.

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