[Ahmedhossamdev]

Fixes #1845

What it does

Adds staticGtfsHash, the hex sha256 of the raw static GTFS zip Maglev loaded, to /api/v2/metadata.json and /healthz?verbose=true. Watchdog can poll it and re-pull the static feed when it changes.

Root cause

Watchdog refreshes its static feed every 24h on its own schedule, so after a new bundle ships it can validate GTFS-RT against an older bundle than Maglev serves. Maglev already stored the hash (import_metadata.file_hash, the static ETag) but never exposed it. The two handlers' duplicated DataFreshness code now shares one dataFreshness helper.

Testing

• Test failing on main before this change: n/a
• Manual check: ran Maglev with testdata/raba.zip:

  $ curl -s 'localhost:4010/api/v2/metadata.json?key=test'
  {"staticGtfsLastUpdated":"2026-10-26T17:28:59.631477461Z","staticGtfsHash":"aac8f1d4893f7c16cd3c5e08460ee9e8a25a8a9e4cdf67ffb6ebc9f7feb4208e","realtimeFeeds":{...}}
  $ sha256sum testdata/raba.zip
  aac8f1d4893f7c16cd3c5e08460ee9e8a25a8a9e4cdf67ffb6ebc9f7feb4208e  testdata/raba.zip
  

Checklist

Ready-for-review requirement: Every box must be checked. If any statement is not true, keep the pull request
as Draft.

• This PR addresses one issue.
• It is under ~200 changed lines, or the description says why it can't be split.
• This PR is not a bug fix, or the new or changed test fails on main and passes on this branch.
• Each commit is one logical change with a clear message.
• I did not hand-edit sqlc-generated files under gtfsdb/ (db.go, models.go, query.sql.go) or testdata/openapi.yml (synced from upstream).
• This PR changes no handler, or handlers pass r.Context() to DB/service calls, not context.Background().
• The response comparison above is filled in, or this PR doesn't change a Java-served response.
• This PR adds no endpoint, or each new endpoint matches testdata/openapi.yml, has an issue open on OneBusAway/sdk-config, or is outside the SDK and the description says why.
• I read every line of this diff and can explain it if asked.

Notes for reviewers (optional)

Both endpoints are Maglev-only, not in the OpenAPI spec or Java. Validator support: OneBusAway/maglev-validator#47.

Summary by CodeRabbit

• New Features
  • Health and metadata responses now include the hash of the static transit data bundle when available.
  • Verbose health responses include static and realtime data freshness details. The static update time is omitted when unavailable, and metadata responses omit the bundle hash when no static data has been imported.
• Bug Fixes
  • Health and metadata requests now return an unavailable response when freshness information cannot be retrieved.

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Reviewing files that changed from the base of the PR and between 10b19b2 and 9667cc5.

Files selected for processing: 4

• internal/restapi/health_handler.go
• internal/restapi/health_handler_test.go
• internal/restapi/metadata_handler.go
• internal/restapi/metadata_handler_test.go

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Reviewing files that changed from the base of the PR and between 63e05bd and 10b19b2.

Files selected for processing: 4

• internal/restapi/health_handler.go
• internal/restapi/health_handler_test.go
• internal/restapi/metadata_handler.go
• internal/restapi/metadata_handler_test.go

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Walkthrough

The freshness response now includes the static GTFS hash. The verbose health and metadata handlers use shared freshness data and return an unavailable response when its lookup fails.

Changes: Static GTFS freshness

Layer / File(s)	Summary
Freshness data and health response internal/restapi/health_handler.go, internal/restapi/health_handler_test.go	The shared freshness helper returns realtime feed times and, when import metadata exists, the static hash and nonzero UTC import time. The verbose health handler returns unavailable if the helper fails. Tests cover the hash and missing-metadata error response.
Metadata response and validation internal/restapi/metadata_handler.go, internal/restapi/metadata_handler_test.go	The metadata handler uses the shared helper and returns unavailable if it fails. Tests check the hash, its omission when no import has occurred, and the response when the import-metadata query fails.

Priority: Normal

Estimated code review effort: 2 (Simple) | ~12 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant Client
  participant HealthHandler
  participant MetadataHandler
  participant DataFreshness
  participant ImportMetadata
  Client->>HealthHandler: Request verbose health
  HealthHandler->>DataFreshness: Get freshness data
  DataFreshness->>ImportMetadata: Query static import metadata
  DataFreshness-->>HealthHandler: Freshness data or error
  HealthHandler-->>Client: Health response
  Client->>MetadataHandler: Request metadata
  MetadataHandler->>DataFreshness: Get freshness data
  DataFreshness->>ImportMetadata: Query static import metadata
  DataFreshness-->>MetadataHandler: Freshness data or error
  MetadataHandler-->>Client: Metadata response

Loading

Possibly related issues

• Trigger an immediate static GTFS refresh when backend agency coverage changes watchdog#163: This change exposes the static-feed hash for synchronization, but does not implement the agency-coverage trigger described in the issue.

Possibly related PRs

• OneBusAway/maglev#1811: Defines static-feed import and fingerprinting behavior; this change exposes the loaded bundle fingerprint.
• OneBusAway/maglev#1469: Uses the static bundle hash as an ETag; this change exposes the hash in metadata and verbose health data.

Suggested reviewers: arcoder181105

Merge Risk: Minimal · previous review 10b19

Metadata query failures no longer appear as successful responses with a missing hash. No actionable merge-blocking risk remains after normal checks.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 20.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 4 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely describes the primary change: exposing the static GTFS hash in metadata.
Description check		The description covers the change, root cause, testing evidence, scope, and checklist. It also explains that the affected endpoints are Maglev-only, so the Java response comparison is not required.
Linked Issues check		Direct linked issue #1845 requires: (1) a hash field in GET /api/v2/metadata.json, (2) omission or null before any import, and (3) tests for the new field. (1) Met. DataFreshness now has `StaticGtf…
Out of Scope Changes check		The changes serve the #1845 objective of exposing the loaded static bundle identity to Watchdog. - The dataFreshness helper replaces duplicated freshness code in both handlers. This refactor suppor…

Full details: Linked Issues check

Explanation

Direct linked issue #1845 requires: (1) a hash field in GET /api/v2/metadata.json, (2) omission or null before any import, and (3) tests for the new field.

(1) Met. DataFreshness now has StaticGtfsHash string with tag json:"staticGtfsHash,omitempty". dataFreshness sets it from metadata.FileHash (the import_metadata.file_hash value named in the issue). metadataHandler returns this value.

(2) Met. The field uses omitempty. dataFreshness returns early with no hash when GetImportMetadata returns sql.ErrNoRows. TestMetadataHandler_NoImportOmitsHash asserts the key is absent.

(3) Met. TestMetadataHandler_StaticGtfsHash compares the response with an independent SHA-256 of testdata/raba.zip. TestMetadataHandler_ImportMetadataQueryFails covers the error path.

The Watchdog-side work named in the issue is out of Maglev scope and is not required here.

Full details: Out of Scope Changes check

Explanation

The changes serve the #1845 objective of exposing the loaded static bundle identity to Watchdog.

• The dataFreshness helper replaces duplicated freshness code in both handlers. This refactor supports the new field.
• The /healthz?verbose=true hash field exposes the same identity through the existing verbose health output. The issue does not name this endpoint. It is still the same Watchdog sync feature and does not add unrelated behavior.
• The 503 response on non-sql.ErrNoRows database errors in metadataHandler and healthHandler is a behavior change. It follows directly from the helper returning errors, so the handlers do not report a missing bundle after a failed read. The issue does not request it, but it is not unrelated.

No change is unrelated to the stated objective. The added tests cover the new behavior.

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[github-actions]

Performance Smoke Test Results

Could not parse smoke test results. Check the workflow logs for details.

Error: ENOENT: no such file or directory, open 'loadtest/k6/smoke-summary.json'

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Actionable comments posted: 2

---

• 🪄 Fix comments: Fix CodeRabbit comments on this PR

Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @internal/restapi/health_handler.go:
- Line 31: Update the freshness path used by dataFreshness and metadataHandler
to distinguish sql.ErrNoRows from other GetImportMetadata failures: preserve the
no-import behavior for sql.ErrNoRows and return an unavailable response for
other errors. Keep GetSystemETag’s empty-value behavior for callers using the
ETag as an optional cache value.

Review comments at @internal/restapi/metadata_handler_test.go:
- Around line 104-107: Update the hash-present test using callAPIHandler to
decode the response into a map, then assert the expected hash through the
literal "staticGtfsHash" key. Keep the status assertion and existing expected
hash unchanged.

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Reviewing files that changed from the base of the PR and between 3b4448b and 63e05bd.

Files selected for processing: 4

• internal/restapi/health_handler.go
• internal/restapi/health_handler_test.go
• internal/restapi/metadata_handler.go
• internal/restapi/metadata_handler_test.go

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[github-actions]

Performance Smoke Test Results

Status: PASSED

Metric	Value
p(95) latency	2.0 ms
Error rate	0.00%
Total requests	320
Req/sec	10.5

Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%.

Full results uploaded as workflow artifact: k6-smoke-summary.

[aaronbrethorst]

Thanks @Ahmedhossamdev, this looks good. The hash comes straight from the import_metadata.file_hash value that the conditional reimport already keys on, so Watchdog compares against the same bytes Maglev decided to load. Folding the two copies of the freshness code into dataFreshness and returning 503 when the read actually fails (not when there's no import yet) is a good catch.

Both endpoints are Maglev-only (Java production 404s on /api/v2/metadata.json and /healthz), so there's no parity question here. I'll file an issue to document the new field and the 503 case on the wiki.

A couple of small nits, not blocking:

• f in healthHandler could be dataFreshness or fresh.
• dataFreshness now reads import_metadata itself while GetStaticLastUpdated still does the same read for the freshness middleware. Fine for now, but it could become one manager method later.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

Performance Smoke Test Results

Status: PASSED

Metric	Value
p(95) latency	2.0 ms
Error rate	0.00%
Total requests	332
Req/sec	10.9

Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%.

Full results uploaded as workflow artifact: k6-smoke-summary.