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radicle-explorer/explorer/docs/api-changes.md
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Daniel Norman d0b5cba95a Document API compatibility and versioning
- Add ADR 0001: one SemVer version for httpd, explorer
  supports every release from a minimum version, a 3-month
  guideline to drop a replaced major, expand and contract,
  and one API path at /api
- Treat 0.y as the major before 1.0
- Track API changes in docs/api-changes.md
- List API changes in httpd release notes
- Take the version from the release tag, not Cargo.toml
- Pass the version to the changelog script
- Link the compatibility rules from the README
- Point to the compat module from the backwards compatibility rules
2026-10-29 18:21:09 +01:00

3.0 KiB

httpd API changes

Every breaking change to the httpd API ships in two steps, see ADR 0001. Expand adds the new shape next to the old one. Contract removes the old one later, on each side separately. This file tracks each change from its expand release until both sides have contracted.

One section per change, under the httpd release that expanded it, newest first. Each section says what the expand added and who reads it, then lists the contract: the code each side removes, and when it may go. Delete a contract line when its code is gone. Delete the section when its contract list is empty. A release fills its ## API changes notes from the sections under its heading, and a major release from every server line.

  • Client contract: the explorer client (http-client/) and the Open Graph worker (workers/open-graph/) may stop reading the old shape when explorer drops the last httpd release without the new shape.
  • Server contract: httpd may stop sending the old shape in a major release after the expand.

Expanded in the next release (unreleased)

API at /api

Expand: httpd serves the API at /api, and still serves it at /api/v1. Read by the explorer client and the Open Graph worker.

Contract:

  • Client, when explorer drops httpd 0.30: switch to /api in http-client/lib/fetcher.ts
  • Client, when explorer drops httpd 0.30: apiBase in workers/open-graph/index.js
  • Client, when explorer drops httpd 0.30: the tests that match /api/v1 in tests/visual/desktop/ and tests/e2e/
  • Server, a major release after the client lines above: the /v1 nest in crates/radicle-httpd/src/api.rs

Repo facts outside the project payload

Expand: cobs, releaseCount and a qualified defaultBranch move out of the project payload. The legacy meta (counts and head) stays inside it. Read by the explorer client and the Open Graph worker.

Contract:

  • Client, when explorer drops httpd 0.30: legacyMetaSchema and legacyRepoFields in http-client/lib/compat.ts
  • Client, when explorer drops httpd 0.30: normalizeRepo in workers/open-graph/index.js
  • Server, a major release: legacy meta and head in crates/radicle-httpd/src/api.rs

Release scope

Expand: the releases query takes scope (trusted or untrusted), and the repo reports release buckets. allAuthors stays. Read by the explorer client.

Contract:

  • Client, when explorer drops httpd 0.30: legacyReleasesQuery, legacyScopeReleases and legacyHasOtherReleases in http-client/lib/compat.ts
  • Server, a major release: allAuthors in crates/radicle-httpd/src/api/query.rs

Removed apiVersion

httpd no longer reports apiVersion in the API root, and explorer no longer checks it. Explorer warns on nodes older than minimumSupportedVersion in http-client/lib/compat.ts, from the version in the API root. Released explorers do not read apiVersion. This is a removal, so the next release is a major release.