Austin McKinley fc750703ac bskyogcard: downscale avatars before rendering
The card routes fetch each avatar from cdn.bsky.app/img/avatar/,
which serves up to 1000x1000. Cards never display avatars above
~210px, but satori parses and resvg rasterizes images at intrinsic
size: ~4MB of decoded native RGBA per avatar per render, up to 7
avatars per starter-pack card, and satori's 500-entry image LRU
retains the oversized data URIs. Under sustained traffic the native
churn and allocator fragmentation grow RSS unbounded and the service
OOMs against its 2Gi limit roughly hourly (observed in prod: ~20
OOMKills/day/pod for weeks).

Resize fetched avatars to 256px max with sharp before handing them
to the render pipeline. Decoded pixel volume drops ~15x; rendered
output is visually identical since display sizes never exceed the
resize cap. libvips' operation cache is disabled since unique-image
traffic never hits it.

Load-tested with 74 real starter packs (6 rounds, concurrency 8):
peak RSS 1441Mi -> ~1000Mi, JS heap 130-160Mi -> 45-70Mi, and
late-round RSS flattens instead of compounding.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-08 23:07:28 -07:00
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Bluesky Social App

Welcome friends! This is the codebase for the Bluesky Social app.

Get the app itself:

Development Resources

This is a React Native application, written in the TypeScript programming language. It builds on the atproto TypeScript packages (like @atproto/api), which are also open source, but in a different git repository.

There is a small amount of Go language source code (in ./bskyweb/), for a web service that returns the React Native Web application.

The Build Instructions are a good place to get started with the app itself.

The Authenticated Transfer Protocol ("AT Protocol" or "atproto") is a decentralized social media protocol. You don't need to understand AT Protocol to work with this application, but it can help. Learn more at:

The Bluesky Social application encompasses a set of schemas and APIs built in the overall AT Protocol framework. The namespace for these "Lexicons" is app.bsky.*.

Contributions

Note

While we do accept contributions, we prioritize high quality issues and pull requests. Adhering to the below guidelines will ensure a more timely review.

Rules:

  • We may not respond to your issue or PR.
  • We may close an issue or PR without much feedback.
  • We may lock discussions or contributions if our attention is getting DDOSed.
  • We're not going to provide support for build issues.

Guidelines:

  • Check for existing issues before filing a new one please.
  • Open an issue and give some time for discussion before submitting a PR.
  • Stay away from PRs like...
    • Changing "Post" to "Skeet."
    • Refactoring the codebase, e.g., to replace React Query with Redux Toolkit or something.
    • Adding entirely new features without prior discussion.

Remember, we serve a wide community of users. Our day-to-day involves us constantly asking "which top priority is our top priority." If you submit well-written PRs that solve problems concisely, that's an awesome contribution. Otherwise, as much as we'd love to accept your ideas and contributions, we really don't have the bandwidth. That's what forking is for!

Forking guidelines

You have our blessing 🪄 to fork this application! However, it's very important to be clear to users when you're giving them a fork.

Please be sure to:

  • Change all branding in the repository and UI to clearly differentiate from Bluesky.
  • Change any support links (feedback, email, terms of service, etc) to your own systems.
  • Replace any analytics or error-collection systems with your own so we don't get super confused.

Security disclosures

If you discover any security issues, please send an email to security@bsky.app. The email is automatically CC'd to the entire team and we'll respond promptly.

Are you a developer interested in building on atproto?

Bluesky is an open social network built on the AT Protocol, a flexible technology that will never lock developers out of the ecosystems that they help build. With atproto, third-party integration can be as seamless as first-party through custom feeds, federated services, clients, and more.

License (MIT)

See ./LICENSE for the full license.

Bluesky Social PBC has committed to a software patent non-aggression pledge. For details see the original announcement.

P.S.

We ❤️ you and all of the ways you support us. Thank you for making Bluesky a great place!

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