Order stop search results by combined stop ID - #1373
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📝 WalkthroughWalkthroughThe change adds a composite ChangesStop agency indexing and search ordering
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to Startup index maintenance can leave stop data incomplete after an interruption or failure while the service continues serving requests, causing missing stops or incorrect search ordering. Merge readiness is moderate until startup maintenance is atomic, fails closed, or retains a correct fallback. Suggested reviewers: Sequence Diagram(s)sequenceDiagram
participant NewClient
participant backfillStopAgencyIndex
participant buildStopAgencyIndex
participant stop_agencies
NewClient->>backfillStopAgencyIndex: initialize index on open
backfillStopAgencyIndex->>stop_agencies: inspect and rebuild legacy schema
backfillStopAgencyIndex->>buildStopAgencyIndex: populate empty index
buildStopAgencyIndex->>stop_agencies: clear and insert stop/agency pairs
sequenceDiagram
participant SearchStopsByName
participant stop_agencies
participant SearchStopsHandler
SearchStopsByName->>stop_agencies: resolve MIN(agency_id) for each stop
stop_agencies-->>SearchStopsByName: return agency IDs
SearchStopsByName->>SearchStopsByName: order by combined agency and stop ID
SearchStopsByName-->>SearchStopsHandler: return ordered rows with AgencyID
SearchStopsHandler-->>SearchStopsHandler: apply response mapping and limit
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes satisfy issue Full details: Out of Scope Changes checkExplanation The changes remain within scope. The stop-agency index, legacy database backfill, related agency lookup update, and supporting tests directly enable or validate combined-ID ordering and correct result truncation. Full details: Docstring CoverageExplanation Docstring coverage is 27.27% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 22 functions across 10 files. (2 skipped: 2 unsupported.) Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
The spec orders matches by the combined {agencyId}_{stopId} ID, and the
deployed OBA server does the same. Ordering by the raw stop ID put a
multi-agency feed's results in the wrong order, and because maxCount
truncates on that order, returned a different set of stops entirely.
Sort on the precomputed agency prefix, and take each stop's agency from
the same value so its ID matches the key it was sorted by. A stop added
since the last import has no index entry, so fall back to the agency of
its serving routes.
Stops no route serves resolve no agency and so have no combined ID.
They sort last rather than interleaved, which changes which stops fill
the maxCount window when such stops match.
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Ahmedhossamdev
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Ahmedhossamdev
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Looks good - verified the ordering against StopBeanIdComparator in the Java
reference and it matches, and the maxCount/limitExceeded interaction is
covered well by the new tests. One small optional note below on the
routes-fallback path, not a blocker.
…o fix/search-stop-order-by-combined-id
…o fix/search-stop-order-by-combined-id
stop_agencies now holds one row per (stop, agency) pair rather than a single collapsed row. Joining it directly, as the ordering query did, fans a multi-agency stop out into one result row per agency - duplicate entries in data.list, and maxCount/limitExceeded counting the duplicates. Resolve the agency with MIN() in a scalar subquery instead of a join, so each stop yields exactly one row, keyed to the same agency its combined ID already carried before this table changed shape.
The handler fell back to a stop's serving routes for its agency when the precomputed index had no entry, in case the index lagged the data it was built from. GetRoutesForStops and BuildStopAgencies run the same stop_times -> trips -> routes join, so any stop reaching that fallback already has an index row - the branch could only ever fire on a stale index, and then disagree with the sort key the query had already committed to. Read the indexed agency directly instead, so the emitted ID and the sort key can no longer diverge. Covers the multi-agency fixture with a duplicate-ID assertion, guarding the fan-out the previous commit fixed.
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Actionable comments posted: 3
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Inline comments:
In `@gtfsdb/client.go`:
- Around line 42-46: Update NewClient so an error from backfillStopAgencyIndex
is returned instead of only logged, preventing construction of a client with an
unavailable or stale stop-agency index. Preserve successful client
initialization when maintenance completes without error.
In `@gtfsdb/models.go`:
- Around line 162-165: Add a Go doc comment immediately before the exported
StopAgency type, beginning with “StopAgency” and briefly describing the type.
In `@gtfsdb/query.sql`:
- Around line 177-191: Update NewClient and buildStopAgencyIndex so
ClearStopAgencies and BuildStopAgencies execute through the same transaction,
using the transaction-bound queries rather than c.Queries. Propagate a failed
backfill to NewClient and avoid returning a usable client or serving reads when
the transaction cannot commit.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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📒 Files selected for processing (12)
gtfsdb/client.gogtfsdb/db.gogtfsdb/fts_queries.gogtfsdb/fts_queries_test.gogtfsdb/helpers.gogtfsdb/models.gogtfsdb/query.sqlgtfsdb/query.sql.gogtfsdb/schema.sqlgtfsdb/stop_agency_test.gointernal/restapi/search_stops_handler.gointernal/restapi/search_stops_handler_test.go
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…o fix/search-stop-order-by-combined-id
OBA API Change Review:
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| Behaviour | Wayfinder/SDK | iOS | Android |
|---|---|---|---|
Stop-search data.list order changes to combined-ID order; capped searches may return a different first N stops. |
SDK callers of searchForStop may observe order/content changes. Wayfinder currently uses stops-for-location, so no Wayfinder impact found. |
No direct search/stop method found. |
No direct search/stop Retrofit method found; current search uses stops-for-location. |
| Agency-less/unserved FTS matches sort after served stops before filtering. | Observable only to SDK consumers of searchForStop; type-compatible. |
No impact found. | No impact found. |
Spec check
- Combined-ID ordering: consistent with the
search-stopspec. maxCounttruncation after ordering: consistent with the spec.- Agency-less matches sorting last: intentional Maglev behavior. This has been documented in
search-stop.mdand the multi-agency deviation tracker.
Overall: spec-consistent after the wiki update.
Verification
Targeted tests passed locally:
go test -tags "sqlite_fts5 sqlite_math_functions" ./gtfsdb ./internal/restapi -run 'TestSearchStopsByName|TestSearchStopsHandlerOrdersByCombinedID|TestSearchStopsHandlerRouteTypeExclusion|TestSearchStopsHandlerParentStationReferences'
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burma-shave
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Code review findings. Note: these concern gtfsdb/client.go and gtfsdb/schema.sql, which aren't in this PR's diff directly (that code landed via #1372) — since #1373 is stacked on top of it, flagging here rather than opening a separate issue against main.
1. gtfsdb/client.go:44 — NewClient leaks the opened *sql.DB when backfillStopAgencyIndex fails
It returns nil, err without closing db. If backfillStopAgencyIndex errors (e.g. disk full during the rebuild transaction, or a permission error on the DB file), the caller has no *Client to close, so the underlying *sql.DB (WAL files, connection pool) leaks. On a retry/supervisor-restart loop this exhausts file descriptors and can leave stale WAL locks blocking a later successful open. This is a new failure path — previously NewClient never returned an error after db was successfully opened.
2. gtfsdb/client.go:60 — PRAGMA foreign_keys = ON is connection-scoped, not database-scoped, so pooled connections never get it
It's executed once via db.ExecContext during schema migration, but SQLite's foreign_keys pragma applies only to the connection it ran on. createDB opens the DB with plain sql.Open(DriverName, config.DBPath) (no _foreign_keys=on in the DSN), and configureConnectionPool sets SetMaxOpenConns(25) for file-backed DBs. Under concurrent load, database/sql opens additional connections that never ran the one-time pragma, so FK enforcement is OFF on those connections. If recreateStopAgenciesTable's rebuild (or any other FK-dependent insert) lands on such a connection, a dangling agency_id reference silently succeeds instead of failing and rolling back the transaction — contradicting the doc comment ("a failure partway through never leaves stop_agencies dropped or half-populated") and the guarantee TestBackfillStopAgencyIndex_RollsBackOnFailure asserts. The test itself can't catch this because the test env forces :memory: with SetMaxOpenConns(1), so it always reuses the one connection that ran the pragma.
3. gtfsdb/client.go:66 — Backfill skip check can't detect a permanently-empty index
The skip check only verifies stop_times has rows (served), not that they actually join to trips/routes. If stop_times contains rows whose trip_id doesn't resolve through trips/routes (reachable via the FK-enforcement gap above, not just manual corruption), BuildStopAgencies's join inserts 0 rows, so indexed stays 0. The skip condition indexed > 0 || served == 0 never becomes true (served stays 1), so every subsequent NewClient call re-triggers the full "rebuilding stop agency index" transaction and table scan indefinitely instead of settling after one successful build.
4. gtfsdb/schema.sql:172 — Comment references a nonexistent method Client.rebuildLegacyStopAgenciesTable
The actual implementation is backfillStopAgencyIndex/recreateStopAgenciesTable in gtfsdb/client.go. A maintainer grepping for rebuildLegacyStopAgenciesTable from this comment to trace the legacy-migration path will find nothing.
3 participants
Closes #1369.
search/stop.jsonordered results by the raw stop ID. The spec orders by the combined{agencyId}_{stopId}ID, and the deployed Puget Sound server agrees — it returns19_1085ahead of1_21680. On a multi-agency feed the raw ordering is wrong, and sincemaxCounttruncates on that order, a capped query returns a different set of stops entirely.Stacked on #1372, which adds the precomputed index this sorts by. That PR should merge first; only the last commit here is new. GitHub can't base a PR on a branch in a fork, hence both targeting
main.Handler discrepancy worth flagging: a stop no route serves resolves no agency and so has no combined ID to sort by. Those now sort last instead of interleaved, so they no longer consume
maxCountslots ahead of real results —TestSearchStopsHandlerRouteTypeExclusionchanged to match. Legacy interleaves them because every stop gets a bundle-level agency at ingestion; Maglev has no equivalent, the same structural gap the wiki already records for parent stations.Verified with
make testandgo vetunder both build tag sets. On the King County Metro feed, a broad prefix query goes from 3.3s with the agency resolved inline to 0.004s against the index.Summary by CodeRabbit
New Features
Bug Fixes