feat(api): paginate /rest/v1/root_cres on request (#847) - #1059
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kunalKumar-13 wants to merge 4 commits into
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feat(api): paginate /rest/v1/root_cres on request (#847)#1059kunalKumar-13 wants to merge 4 commits into
kunalKumar-13 wants to merge 4 commits into
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/rest/v1/root_cres returned every root CRE in one unbounded response and had no way to page through them. Pagination is opt-in. The CLI import (cre_main.download_cre_from_upstream), the Explorer tree (DataProvider.rebuildDataTree), the Browse page and the list_root_cres MCP tool all read this endpoint as the complete list of roots, so a response that paged by default would silently truncate an upstream import to the first page. Without page/per_page the response is unchanged; with either present it pages exactly as /rest/v1/all_cres does, including the same MAX_ITEMS_PER_PAGE cap and the page/total_pages keys. The root-CRE query is shared between get_root_cres and the new get_root_cres_with_pagination, so both return the same set in the same order. The other half of OWASP#847, capping per_page on /rest/v1/all_cres, was fixed in 694f61e. The OpenAPI spec is regenerated, which also gives the list_root_cres MCP tool page and per_page automatically.
kunalKumar-13
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WalkthroughChangesRoot CRE retrieval now supports optional pagination with deterministic ordering. The endpoint validates and caps page sizes, preserves unpaginated responses, and documents the new request and response schemas. Root CRE pagination
Priority: ➖ Normal — Impact reflects medium issue severity. Estimated code review effort: 3 (Moderate) | ~25 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to The endpoint adds opt-in, bounded pagination while preserving the existing unpaginated response for requests without pagination parameters. No concrete current-head merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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In `@application/database/db.py`:
- Line 2784: Update the query flow around _root_cres_query().paginate so it
applies deterministic ordering by the stable unique CRE.id field before
pagination, preserving the existing pagination behavior while ensuring page
boundaries remain consistent.
In `@application/web/web_main.py`:
- Around line 685-692: Update the pagination parameter handling in the root_cres
request flow to parse page and per_page once, preserve defaults when either is
missing, and abort with HTTP 400 when either supplied value is not an integer.
Retain the existing positive-value checks and assignments for valid inputs.
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application/database/db.pyapplication/tests/db_test.pyapplication/tests/web_main_test.pyapplication/web/openapi_registry.pyapplication/web/openapi_schemas.pyapplication/web/web_main.pydocs/api/openapi.yaml
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Two problems with the pagination added in the previous commit, both raised in review. Ordering: _root_cres_query paginated a query with no ORDER BY. The database is then free to return rows in any order, so page boundaries can move between requests and a CRE can appear on two pages while another is never returned. Order by external_id, with the primary key breaking ties so the order is total. get_root_cres shares the query, so the paginated pages remain exactly the unpaginated list. This does not reproduce on SQLite, which returns a small table in insertion order, so the new test is a regression guard rather than a reproduction. It matters on Postgres, which is what production runs. Parameters: int() on a non-integer page or per_page raised ValueError with nothing to handle it, so ?page=abc was a 500 for what is a client mistake. Parse each value once and return 400. Values of zero or less still fall back to the defaults, as in all_cres.
The fixture inserted root CREs already in external_id order, and SQLite hands back a small table in insertion order, so the test passed with or without the ordering it was meant to protect. Insert them descending and assert the ascending sequence: removing the ORDER BY now fails the test with the rows in insertion order. Same weakness as the all_cres test on OWASP#1060, raised in review there.
Same gap as the all_cres test on OWASP#1060: every ordering fixture used a distinct external_id, so the test passed whether or not the sort carried its CRE.id half. external_id is not unique on its own -- the constraint is on (name, external_id) -- so ties are possible and the tie-break is what makes the order total. Two root CREs share an external_id here and are inserted in the opposite order to their primary keys, which are fixed rather than generated. Dropping CRE.id from the sort now fails the test.
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Closes #847.
/rest/v1/root_cresreturned every root CRE in one unbounded response with no way to page through it. This addspageandper_page, with the sameMAX_ITEMS_PER_PAGEcap and the samepage/total_pageskeys that/rest/v1/all_cresalready returns.Pagination is opt-in — and why
Four things read this endpoint as the complete list of roots:
cre_main.download_cre_from_upstream— the CLI import iteratesdata["data"]from opencre.orgDataProvider.rebuildDataTree— the Explorer builds its whole tree from itbrowseRootCres.tsx)list_root_cresMCP toolIf the endpoint paged by default, an upstream import would silently stop at the first 20 roots. So without
page/per_pagethe response is byte-for-byte what it was; with either present it pages likeall_cres. The spec description says so, and the handler comment names the consumers so the next person knows why.The root-CRE query is factored into
_root_cres_query()and shared byget_root_cresand the newget_root_cres_with_pagination, so both return the same set in the same order.The other half of the issue is already done
The
all_cresper_pagecap the issue also asks for landed in 694f61e (per_page = min(per_page, MAX_ITEMS_PER_PAGE), withtest_all_cres_caps_per_pageand the integration test). I did not touch it; this PR covers theroot_creshalf, which was still open.Tests
Written first, run before the implementation, and they failed on exactly the missing pieces (
'Node_collection' object has no attribute 'get_root_cres_with_pagination';10 != 25forper_page=10).test_find_root_cres_paginates_only_when_asked— no params: original shape, paginated method never calledtest_find_root_cres_caps_per_page—per_page=1000reaches the DB as 100test_find_root_cres_pagination_integration— real DB, 25 roots plus one contained child: pages 1 and 3 have 10 and 5, three pages cover all 25 with no repeats, the child never appears,pagealone usesITEMS_PER_PAGE, a page past the end is 404 rather than everythingtest_get_root_cres_with_pagination— collection level: pages equal slices ofget_root_cres(), a page past the end is emptydocs/api/openapi.yamlis regenerated withscripts/generate_openapi.py, not hand-edited, and the guardrail passes. Because MCP input schemas derive from the spec,list_root_cresgainspageandper_pagewith no catalog change (formatstill omitted).Checks
unittest discoverauth_routes_testcases, identical onmainwith the same environment (they needNO_LOGINunset, and pass then)make openapi-guardrailblackmypy(Makefile flags) on the four changed production files