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Import GTFS-Flex data (1/5) - #1481
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The description explains the feature, implementation scope, dependencies, testing, and known limitations, but it does not follow the repository template. It omits the required issue reference, standar… | Update the description to use the repository template. Add the issue reference, What it does, Root cause, Testing details, applicable response-comparison information, and Notes for reviewers. Complete every applicable checklist item, or kee… |
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Docstring coverage is 44.19% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 129 functions across 24 files. (1 skipped… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly identifies the primary change: importing GTFS-Flex data as the first part of a five-part stack. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Explanation
The description explains the feature, implementation scope, dependencies, testing, and known limitations, but it does not follow the repository template. It omits the required issue reference, standard sections, and completed checklist.
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Update the description to use the repository template. Add the issue reference, What it does, Root cause, Testing details, applicable response-comparison information, and Notes for reviewers. Complete every applicable checklist item, or keep the PR as Draft until the requirements are met.
Full details: Docstring Coverage
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Docstring coverage is 44.19% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 129 functions across 24 files. (1 skipped: 1 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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In `@internal/geo/simplify.go`:
- Around line 39-75: Update SimplifyPolygons to choose a simplification
tolerance independently for each ring, so a large ring can increase its
tolerance without collapsing a small exterior below four positions; report the
largest tolerance used in ToleranceMeters. Remove simplifyAtTolerance if it
becomes unused, and add a MultiPolygon test containing a large ring and a small
square that asserts the small exterior retains at least four positions.
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go.modgtfsdb/client.gogtfsdb/db.gogtfsdb/debugging.gogtfsdb/flex_compile.gogtfsdb/flex_compile_test.gogtfsdb/flex_import.gogtfsdb/flex_import_test.gogtfsdb/flex_schema_test.gogtfsdb/flex_warnings_test.gogtfsdb/helpers.gogtfsdb/helpers_test.gogtfsdb/models.gogtfsdb/query.sqlgtfsdb/query.sql.gogtfsdb/schema.sqlgtfsdb/validation_test.gointernal/flexfixtures/flexfixtures.gointernal/geo/geojson.gointernal/geo/geojson_test.gointernal/geo/geometry.gointernal/geo/geometry_test.gointernal/geo/simplify.gointernal/geo/simplify_test.gointernal/utils/geometry.go
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Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
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Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
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Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
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I ran nine other public Flex feeds through the import on this stack, from VBB, the Swiss national dataset, two French networks, RABA, three Trillium agencies and a demo feed. Eight of them come in fine. The Swiss one loses all its zones though. Its stop_times.txt header has a space before location_id, so go-gtfs doesn't see that column and drops every zone row. That's about 40% of the feed's trips gone. I trimmed the header names in csv.New and the whole feed loads, so I opened OneBusAway/go-gtfs#7 for it. The space is really the feed's fault, so up to you whether go-gtfs should put up with it. |
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Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
Thanks Om! I'm a big believer in the maxim of 'be liberal in what you accept and conservative with what you emit,' and fixed the Swiss bug :) https://lawsofux.com/postels-law/ |
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@burma-shave thanks for the detailed review! I have fixed the issues you described here, for the most part, and pointed you to the stacked PRs that fix the other issues you described. Ready for a followup review. |
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@aaronbrethorst Thanks for working through the last round. The fixes all check out on my end. Before going further on this stack, I'd like to sequence it after the streaming import (#1662 → #1677). That stack fixes the OOM on large feeds, and its parity tests would give us a cheap way to show Flex leaves fixed-route output unchanged. The catch is go-gtfs. This PR pins go-gtfs PR #6 as a pseudo-version, and none of the tagged releases include it, v1.4.0 included. #1676 moves the import onto v1.4.0's
Does that order work for you, or do you see a reason to land Flex first? Generated by Claude Code |
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Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
Bump go-gtfs to the gtfs-flex branch, which parses locations.geojson, location_groups, booking_rules and the windowed stop_times columns. The validator previously dropped every trip with a stop-less record and hard-failed when all trips were gone, so a flex feed did not import at all. Zero stops is now fatal only when there are also zero locations, records must reference exactly one of stop/location/group, and timed records still require a stop. A stop counts only when its id is non-empty, in both checks, so a timed record with an empty stop id and a location is still rejected as the pre-flex validator did. Only timed records are written to stop_times and used by the block trip and layover indexes; a trip with no timed records is skipped by both. The bump, the validator change and these guards land together because each one alone leaves the importer dereferencing a nil stop. Add three real flex feeds as fixtures: Alexandria (one zone), Manistee (zone-to-zone plus a timed route) and Charlevoix (a location group).
Add booking_rules, locations, location_groups, location_group_stops and flex_stop_times, plus the ondemand_services/ondemand_rules/ ondemand_stop_services tables that rule compilation will fill, with the sqlc queries the importer and the /ondemand handlers need. Windowed stop_times records get their own table so stop_times keeps its NOT NULL times and no /where consumer changes. Because flex tables are only written inside StoreGtfsData, which is skipped on an unchanged feed hash, NewClient stamps PRAGMA user_version and rewrites import_metadata.file_hash to a sentinel once, forcing a single reimport on upgrade.
internal/utils imports gtfsdb (filters.go, sort.go), so gtfsdb cannot import utils, yet the GTFS-Flex importer needs bounding boxes and display-geometry simplification for locations at import time. Move geometry.go and its tests into internal/geo, which imports nothing from maglev, and have utils/geometry.go re-export the same names (CoordinateBounds and SimplifiedPolygons as type aliases) so every existing call site keeps compiling unchanged. Flex zones arrive as GeoJSON Polygon/MultiPolygon features. The parser normalises both to polygons[p][ring][vertex] so containment and simplification work on one shape, and the encoder writes display geometry back out. Geometry with no polygons, a polygon with no rings, or an exterior ring shorter than four positions is an error, since the result is stored as a zone. Douglas-Peucker runs per ring on the open ring split at the vertex farthest from vertex 0, because standard DP degenerates on a closed ring whose chord has zero length. The tolerance starts at 10 m and doubles until every ring has at most 256 vertices; that bound wins over the 10 m target because Alexandria's 4,239-point zone needs ~160 m. A ring whose vertices all coincide collapses to a closed pair (dropped as a hole, kept as an exterior), and the doubling is capped at 40 steps as a backstop, since DP is not strictly monotonic in its tolerance. Antimeridian-straddling rings are not handled.
Insert booking rules, locations (with bounding box and display geometry), location groups and their members before trips, and every windowed stop_times record into flex_stop_times after trips, all inside the import transaction. go-gtfs accepts duplicate ids and resolves references to the last one, so keep only the last booking rule, location and group per id and drop repeated members; otherwise the primary keys would fail the import. A location with no storable geometry is skipped with a warning instead of failing the whole feed. Also log each parser warning with its kind, file and row, capped at 200 lines with a summary, so a skipped flex record is visible in the log rather than hidden behind the existing warning count.
The skipped-location warning used the bare default logger, so it lacked the component attribute every other importer log line carries and could not be filtered with them. Also pin the warning cap's boundary: exactly 200 warnings log 200 lines and no truncation summary.
CompileOnDemand turns each flex-involved route into one on-demand service and each (pickup-capable, later drop-off-capable) record pair into an availability rule, with pickup-side fields from the pickup record and drop-off-side fields from the drop-off record. Rules dedupe to one row per tuple and GTFS service id; serviceKind is classified from the records so a feed that permits no pickups still yields a service. The single-agency fallback for routes is shared with the route insert via soleAgencyID. The stop agency index now also covers stops that only appear as rule endpoints or group members, since Charlevoix's ferry stops have no stop_times rows and search-stop reads that index with no fallback. That branch joins stops because a group member without coordinates is never stored and stop_agencies has a foreign key to stops.
SimplifyPolygons doubled one tolerance until the largest ring fit the 256-point bound, then applied it to every ring. In a MultiPolygon with a large zone and a small one, the small zone's exterior could collapse to three positions: an invalid GeoJSON ring that ParseGeoJSONPolygons rejects, so the zone vanished from the stored display geometry. Search the tolerance per ring instead, and report the largest one used.
SonarCloud flags a DELETE with no WHERE clause as a reliability blocker. Emptying these tables is intended, so state it with WHERE TRUE, as ClearStopAgencies already does.
Adding the eight flex tables pushed clearAllGTFSDataWithQueries to 21 sequential if-err branches, over SonarCloud's cognitive complexity limit. A table of steps keeps the foreign-key order in one visible list and wraps every error the same way.
A route was labelled zoneToZone when its trips referenced two or more zones in total. Dial-a-ride routes often run one zone per trip: Heartland Express (the gtfs.org single-zone example) runs New Ulm and Brown County as separate trips, and Island Transit paratransit runs three zones that way. Every rule is same-zone travel, yet both compiled to zoneToZone, which clients render as travel between zones and are told not to second-guess. A route is now zoneToZone only when a single trip references two or more zones, matching the wiki's pattern table.
Every pickup-capable record was paired with every later drop-off- capable record on the types alone. The spec's reachability rule also requires that the start/end_pickup_drop_off_window constraints do not forbid the ride, so a pickup window of 15:00-18:00 followed by a drop-off window of 05:00-08:00 compiled to a rule describing a ride nobody can take. A pair is now skipped when the drop-off side closes before the pickup side opens. No real feed in the test corpus has such a pair.
Display simplification always kept a zone's exterior ring, but a zone narrower than the 10 m starting tolerance (a thin corridor, a small stop buffer, a sliver part of a MultiPolygon) was reduced to three positions: a line with no area. That is invalid GeoJSON, which strict client decoders reject, so the zone vanished from the map. When a pass would collapse the exterior below four positions, the original ring is used instead, sampled down to the 256-vertex bound if it is larger. Holes still drop out as before.
Region bounds came only from the stops that timed stop_times serve, so an agency whose feed has zones but no stops.txt got no coverage area: agencies-with-coverage reported zero bounds for it, and in a mixed deployment CheckIfOutOfBounds could never place a request inside it. Add the stops, zone bounding boxes and location group members that an agency's flex records reference to the bounds query.
Forcing the one-time flex reimport overwrote import_metadata.file_hash with a sentinel. That column is also the system ETag, so until a reimport succeeded (say the feed URL was down at startup) every response carried 'invalidated:flex-import-v1', across restarts. Clear file_source instead. The import skip check compares both hash and source, so the reimport still happens, and the ETag keeps naming the data actually being served.
timedStopTimes built a filtered copy of every trip's stop times, and the importer calls it three times per trip: the stop_times insert and the block trip and layover indexes. A fixed-route feed with millions of stop_times paid for three extra full copies on every import. Return the trip's own slice when it has no windowed record. Every caller only reads the result.
Two allocations in the rule compiler did no useful work: - recordsBySequence cloned and re-sorted every flex trip's records, but go-gtfs already sorts a trip's stop times by stop_sequence, and timedStopTimes relies on that same ordering. - compileTripRules expanded every location group member into a stopIDs slice for each pickup/drop-off pair before addRule threw most of them away as repeats. With 300-stop groups shared by hundreds of trips, that is a ~600-element slice per pair per trip. Use trip.StopTimes directly, and carry the two records on tripRule so addRule expands their stops only for a rule it has not seen.
The flex importer carried its own pointer-to-nullable helpers, one of which duplicated nulls.Float64FromPtr. Use the existing helper, and add the generic Int64FromPtr and StringFromPtr to internal/nulls beside it, where CONTRIBUTING puts nullable field helpers.
internal/utils re-exports geometry from internal/geo so existing utils call sites keep compiling. The flex additions to that layer (the GeoJSON parse/encode, bounds and simplify wrappers and their constants and types) have no utils callers anywhere: gtfsdb uses internal/geo directly. Remove them.
storeLocations skipped, with a warning, any location whose geometry it could not store, but kept the trips and compiled rules that point at it. flex_stop_times and ondemand_rules have no foreign key to locations, so those rows were left dangling. Neither skip reason should drop the location. go-gtfs already discards a feature without polygons, along with the records that reference it, so meeting one here means that guarantee broke: fail the import rather than store dangling rows. When only the simplified display geometry cannot be encoded, store the location without it and serve the verbatim geometry.
Static feeds are imported as a stream, so a parsed trip carries no stop times and CompileOnDemand, given data.Static, found no flex records. Give it the same flex trips the flex stop-time insert reads: the copies, with their stop times, that the stop-times pass keeps of each stored trip with a flex record. The compile tests parse their fixtures with gtfs.ParseStatic, which keeps stop times in memory, since CompileOnDemand takes trips that carry them.
The RABA parity golden lists a digest for every table. The GTFS-Flex tables are new and RABA has no flex data, so each one is listed with zero rows. Every existing table keeps its digest, which shows the flex import leaves a fixed-route feed's rows unchanged.
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Performance Smoke Test ResultsStatus: PASSED
Smoke test config: 5 VUs x 30s. Thresholds: p(95) < 300ms, error rate < 1%. Full results uploaded as workflow artifact: k6-smoke-summary. |
Part 1 of 5 stacked PRs adding GTFS-Flex support (design:
docs/superpowers/specs/2026-09-24-gtfs-flex-implementation-design.md, lands in part 4). Depends on go-gtfs OneBusAway/go-gtfs#6, now merged; go.mod pins its merge commit on go-gtfs main (v1.4.1-0.20261022045510-4daa905fc5ec) until the next go-gtfs release.Summary
booking_rules,locations,location_groups,location_group_stops,flex_stop_times) and the compiledondemand_services/ondemand_rules/ondemand_stop_servicestables; windowed stop_times rows go toflex_stop_times, neverstop_times, so every existing query keeps its NOT NULL times.gtfsdb/flex_import.go,flex_compile.go), with the pure geometry code in a new leaf packageinternal/geo(parsing, containment, distance, ≤256-point simplification).PRAGMA user_versiononce so a pre-Flex database reimports; add the three real Flex fixtures (Alexandria, Manistee, Charlevoix) and synthetic fixtures.Test plan
go vet(cgo + purego),make test,go fmtReview notes
trips.min_arrival_time IS NULLidentifies a flex-only trip; block-scoped queries filter it (see part 3 for the /where side).main, not fixed here: a database created beforefeed_expires_atexisted fails at startup becauseimport_metadatais onlyCREATE TABLE IF NOT EXISTS(noADD COLUMNmigration).Summary by CodeRabbit