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@sij411 sij411 commented Dec 30, 2025

Summary

Added a manual for @fedify/relay. Related to #359

Notes

Could you check if this documentation contains all information for building relay servers? I'm open to take opinions or recommendations.

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Summary of Changes

Hello @sij411, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a comprehensive manual for @fedify/relay, providing in-depth guidance for developers looking to implement ActivityPub relay servers. The documentation covers everything from initial setup and configuration options to handling subscriptions, managing follower data, and critical security considerations. It also outlines different relay types and offers insights into monitoring and operational best practices, ensuring users can build and maintain robust and secure relay infrastructure.

Highlights

  • New Relay Manual: A comprehensive manual for @fedify/relay has been added, detailing how to set up and configure ActivityPub relay servers.
  • Relay Types Explained: The manual introduces and differentiates between 'Mastodon-style' and 'LitePub-style' relay protocols, offering guidance on compatibility and features.
  • Security and Operations Guidance: Detailed sections on security considerations (signature verification, subscription abuse, content moderation, privacy), storage requirements, and monitoring (logging, OpenTelemetry) are included.

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Code Review

This pull request adds a comprehensive and well-structured manual for @fedify/relay. The documentation is excellent, covering everything from initial setup to advanced topics like security and monitoring. I've provided a couple of suggestions to improve formatting consistency and to make a code example safer and more robust. Overall, this is a great addition to the project's documentation.

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codecov bot commented Dec 30, 2025

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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Thank you for writing this comprehensive documentation for @fedify/relay! The overall structure is well-organized and covers the essential topics.

However, I have a concern about the Managing followers section that I'd like to discuss.

sij411 and others added 4 commits January 1, 2026 01:57
Replace direct KvStore access with the new Relay interface methods:
- Use relay.listFollowers() instead of kv.list()
- Add documentation for relay.getFollower()
- Update RelayFollower type to show actorId and validated Actor object
- Remove isRelayFollower reference (now internal as isRelayFollowerData)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>
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Thank you for this comprehensive documentation for @fedify/relay! The overall structure is excellent and covers the essential topics well.

However, I found a few issues that need to be addressed before merging:

Documentation build fails due to Twoslash errors

Running pnpm build in the docs/ directory fails with the following errors:

[2307] Cannot find module '@fedify/relay' or its corresponding type declarations.
[7006] Parameter 'ctx' implicitly has an 'any' type.
[7006] Parameter 'actor' implicitly has an 'any' type.

The @fedify/relay package isn't available in the docs build environment. You'll need to add the package to the docs dependencies. For the implicit any errors, you may need to add explicit type annotations in the code examples.

Markdown style guide issues

There are some places that don't follow the Markdown style guide described in AGENTS.md. Please review the guide and update the formatting accordingly.


Once these issues are resolved, the documentation looks great!

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There are some places that don't follow the Markdown style guide described in AGENTS.md. Please review the guide and update the formatting accordingly.

Tip

If you're using Claude Code, you can ask it to reformat docs/manual/relay.md according to the Markdown style guide in AGENTS.md—it should handle this well!

Comment on lines 283 to 322
Follower data is stored in the [`KvStore`](./kv.md) with keys following the
pattern `["follower", actorId]`. Each entry contains:

- `actor`: The actor's JSON-LD data
- `state`: Either `"pending"` or `"accepted"`

### Querying followers

~~~~ typescript twoslash
import type { KvStore } from "@fedify/fedify";
const kv = null as unknown as KvStore;
// ---cut-before---
import type { RelayFollower } from "@fedify/relay";

for await (const entry of kv.list<RelayFollower>(["follower"])) {
console.log(`Follower: ${entry.value.actor["@id"]}`);
console.log(`State: ${entry.value.state}`);
}
~~~~

> [!NOTE]
> The `~KvStore.list()` method requires a `KvStore` implementation that
> supports listing by prefix (Redis, PostgreSQL, SQLite, Deno KV all support
> this).
### Validating follower objects

~~~~ typescript twoslash
import type { KvStore } from "@fedify/fedify";
const kv = null as unknown as KvStore;
// ---cut-before---
import { isRelayFollower } from "@fedify/relay";

for await (const entry of kv.list(["follower"])) {
if (isRelayFollower(entry.value)) {
console.log(`Valid follower in state: ${entry.value.state}`);
}
}
~~~~

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The Querying followers and Validating follower objects subsections were removed in this commit, but I believe these examples are valuable for users who need to work with follower data directly through KvStore.

Could you please restore these examples? They demonstrate important use cases:

  • How to iterate over followers using kv.list<RelayFollower>(["follower"])
  • How to validate follower objects using isRelayFollower() type guard

If there were Twoslash type errors with these examples, we can work together to fix them rather than removing the examples entirely.

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Unfortunately, that was the result of asking CC to use AGENTS.md to follow markdown styles. Welp, it seems that didn't work very well though.

The problem could be solved with adding isRelayFollower. However, whendo people use directly querying follower over public APIs?

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Actually, I take that back. Since there's already a Listing all followers subsection using relay.listFollowers(), the Querying followers subsection would be redundant. And isRelayFollower() isn't exported anyway, so removing both subsections was the right call. Sorry for the confusion!

dahlia
dahlia previously approved these changes Jan 1, 2026
- Fix markdown style to follow the style guide:

  - Fix title underline length to match "Relay"
  - Align all tables properly
  - Remove trailing spaces
  - Wrap long lines at 80 characters
  - Use italics for package names instead of backticks
  - Use en dash for "Key–value"

- Add Bun and Node.js server examples alongside Deno
- Add pnpm and Yarn installation commands
- Add "Subscribing to a relay" section explaining:

  - Different subscription URLs for Mastodon-style vs LitePub-style relays
  - How to subscribe from Mastodon
  - How to subscribe from Pleroma/Akkoma

- Add FEP-ae0c reference for protocol specifications
@dahlia dahlia merged commit a9d733c into fedify-dev:next Jan 1, 2026
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