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SEL-598: EPCIS Phase B lossless lot identity (Preview) - #3727
tests/shared/test_epcis_lot_identity_sel598.py — synthetic URIs only (A-2165). No partner data. SEL-549 and SEL-590 holds stay.
Review
Please have Hermes post REVIEW: PASS|FAIL hermes <head_sha> on this exact head.
Merge
Do not merge from this session. Needs green CI + PASS from a different engine. No force push / admin merge.
Head: ebd8ea3b1cd3c29431b66fdb4fa26d4d3873decc
Note
Medium Risk
Changes canonical traceability_lot_code shape and dedup/hash semantics for EPCIS events, but rollback is env-flagged and export/ingest paths are covered by targeted tests.
Overview SEL-598 (H2) adds shared lot normalization so ingest and export stop truncating LGTINs and GS1 Digital Link class URIs to bare lot tokens.
A new epcis_lot_identity module parses full class URIs, derives lot_token for UI/rebuild paths, and gates behavior with LOT_IDENTITY_LOSSLESS (on by default; 0/false restores segment-only traceability_lot_code writes).
Canonical EPCIS normalization now prefers full class URIs from quantity classes/EPCs, runs ILMD and flat lot fields through normalize_epcis_lot, and records lot_token on transformation inputs alongside the stored lot key.
**EPCIS export _epc_class emits an stored full URI unchanged (including from traceability_lot_code) and uses lot_token_only so GTIN+lot rebuilds never embed a full URI in the /10/lot-segment segment.
Synthetic coverage lives in test_epcis_lot_identity_sel598.py.
Reviewed by Cursor Bugbot for commit 76eb2c7. Bugbot is set up for automated code reviews on this repo. Configure here.
Canonical stored identity is the full LGTIN or GS1 Digital Link; bare lot
is derived. Export emits a stored class URI unchanged and never passes a
full URI as the lot argument when rebuilding. Flag LOT_IDENTITY_LOSSLESS
defaults on (set 0 to restore segment-only writes). Synthetic tests only.
VS Code Lead: please review as Hermes. Target head 76eb2c76559bd36abc37208472969c00f4cdfb18. Post REVIEW: PASS|FAIL hermes <head_sha> on this exact head. Scope is H2 / SEL-598 lossless lot identity only (Preview).
The changes add shared helpers to parse and normalize EPCIS lot identities, including LGTIN and GS1 Digital Link class URIs. Canonical event handling uses these helpers for lot resolution and transformation inputs. Export uses them to identify class URIs and extract lot tokens when building Digital Links. The LOT_IDENTITY_LOSSLESS setting controls whether full class URIs remain canonical or resolve to lot tokens. New tests cover parsing, normalization, event handling, transformation inputs, and export.
This change can store a wrong GTIN and rewrite received lot codes in EPCIS records. It can also drop transformation input lots and export invalid class URIs, which risks incomplete lot linkage in traceability and FDA exports. Fix these before merging.
Security architecture risk: Moderate · up to 76eb2
This changes the stored lot identifier format without demonstrated compatibility for historical records or rollback. Traceability can become incomplete, and malformed identifiers can enter exported documents. The reviewed tenant-isolation controls remain intact.
Retained concerns
High · reliability · inferred: Default-on URI identities are incompatible with historical token-based lineage keys in the inspected persistence path. A transformation referencing a full class URI cannot resolve a source event stored under its bare token; the writer then permits a null input_event_id. Forward traversal from the historical token also misses edges keyed by the URI. Disabling the flag changes future writes without reconciling existing identifiers, and ordinary same-key retries return before recreating links. This makes lineage continuity and rollback incomplete.
Medium · security · observed: Export now treats recognition by the lenient shared parser as sufficient to emit a class URI unchanged. This bypasses the existing validator's Digital Link length and check-digit requirements and its stricter LGTIN shape constraints. Stored malformed identifiers can consequently enter the exported traceability document instead of taking a validated fallback or being skipped. Optional document validation does not recheck these identifier properties. The demonstrated boundary weakening concerns output integrity, not network access or tenant authorization.
Security review details
Security Blast Radius
inferred — The demonstrated exposure is the integrity of affected tenants' stored lineage and exported traceability documents. The code is shared across EPCIS users, but the reviewed export and source-event lookups retain explicit tenant predicates. No cross-tenant expansion or additional credential authority was established.
Security Findings and Attack Paths
inferred — A party able to populate stored tenant class or lot fields can supply an identifier that fails the previous strict validator but passes the new parser. Export then places it into EPCIS quantity fields. The supported outcome is malformed identity propagation; external consumer behavior and exploitation beyond document integrity are unknown.
Trust Boundaries and Controls
observed — Export obtains the authoritative tenant identifier from TenantContext rather than the request's tenant_id field, then queries tenant-scoped rows. The changed helper transforms those loaded values and returns JSON; it does not use a class URI to select a tenant or perform a network request.
Resilience and Maintainability Implications
observed — The writer serializes canonical writes per tenant and short-circuits existing idempotency keys. Those controls do not reconcile identity aliases: a missing exact-match source can produce a link with a null event reference, while a subsequent same-key retry returns before link creation. The recovery limitation predates the PR, but the representation transition newly exposes it to historical identifier mismatches.
Hardening Proposals
proposed — Define a representation-independent, tenant-scoped identity resolver that retains product identity, with historical compatibility and replay-safe link reconciliation before relying on the default-on transition or rollback. Avoid token-only aliasing that would merge different products.
proposed — Separate lossless preservation from strict outbound validation. Preserve received identifiers for provenance, but consistently validate class structure, GTIN construction, and check digits before treating an identifier as an exportable class.
Pre-merge checks: 4 · 1
Failed checks: 1 warning
Check name
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Explanation
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Docstring Coverage
Docstring coverage is 68.75% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…
Write docstrings for the functions missing them to satisfy the coverage threshold.
Passed checks: 4 passed
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Title check
The title clearly identifies the SEL-598 change and the main feature: lossless EPCIS lot identity in Preview.
Linked Issues check
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Description check
The description provides the change summary, implementation details, rollback behavior, scope, tests, related issue references, and merge requirements. It does not explicitly complete the template che…
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The description provides the change summary, implementation details, rollback behavior, scope, tests, related issue references, and merge requirements. It does not explicitly complete the template checkboxes for Type of Change, Test Plan, or Checklist, and it omits the dedicated Related Issues heading, but the required information is mostly present.
Full details: Docstring Coverage
Explanation
Docstring coverage is 68.75% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 16 functions across 4 files.
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
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This PR already edited epcis_export.py + shared lot-identity files before that check. No further edits from this worktree to exporter / test_epcis_export_gs1_2.py / graph compliance.py. Prefer landing H2 via #3728; treat this as duplicate unless Hermes asks for a slim shared-only split.
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Actionable comments posted: 6
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @services/ingestion/app/epcis_export.py:
- Around line 348-355: Update the class URI handling to return a value only when
it passes _valid_class_uri; remove the is_full_class_uri fallback and
parsed.canonical_id return so rejected values continue through the existing
fallback and missing_epc_class handling.
Review comments at @services/shared/canonical_event.py:
- Line 1195: Update the transformation-input deduplication around lot_token and
seen to key class lots by lot_key, with a distinct key namespace for instance
EPC entries in the shared seen set. Preserve the existing behavior when lossless
mode is off, where lot_key equals the token.
- Around line 1135-1141: Update the canonical lot-resolution flow so ILMD lot or
traceability lot code takes precedence over class URIs from EPC and quantity
lists, matching the legacy resolver; use `parse_class_uri` only as the fallback
when ILMD supplies neither value. Update the nearby precedence comments to
reflect this behavior.
- Around line 1146-1148: Update both bare ILMD and flat-TLC calls to
normalize_epcis_lot to omit the gtin argument, while preserving the separate
GTIN KDE handling. Add a regression test confirming that a bare ILMD TLC remains
unchanged when an SGTIN EPC is present.
Review comments at @services/shared/epcis_lot_identity.py:
- Around line 42-53: Update _company_item_to_gtin14 to put the indicator digit
before the company prefix and append the computed GS1 check digit. Reject
invalid check digits in the GTIN parser and remove the raw-value fallback that
accepts them after normalize_gtin14 returns None. Update synthetic GTIN-14
fixtures to use the corrected value so parsed GTINs remain consistent in both
lossless modes and Digital Link rebuilding.
Review comments at @tests/shared/test_epcis_lot_identity_sel598.py:
- Line 78: Strengthen the round-trip assertion in the test by requiring
rebuilt.canonical_id to equal SYN_DL directly; remove the alternative lot_token
and gtin checks so the test verifies the promised full Digital Link equality.
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Parked as draft. This duplicates Pi’s #3728 (pi/epcis-h2-sel598-lot), which is the H2 / SEL-598 PR of record. Branch cursor/sel598-phase-b kept; no further work from cursor-sel598.
Reconstruct GTIN-14 from EPC company.item with indicator + check digit;
preserve bare ILMD/flat TLC (no fabricated Digital Link from SGTIN GTIN);
export only via _valid_class_uri; dedupe transformation inputs by lot_key;
tighten round-trip and add regression tests.
Signed-off-by: Christopher Sellers <1@christophersellers.com>
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Summary
H2 / SEL-598 lossless lot identity on top of merged Phase A (#3680).
services/shared/epcis_lot_identity.pyLOT_IDENTITY_LOSSLESSis on (default); bare lot is derived_epc_classemits a stored class URI unchanged and never passes a full URI as the lot-segment rebuild argumentLOT_IDENTITY_LOSSLESS=0restores segment-only canonical writesTakeover / review fixes (Pi)
Addressed open Codex / Bugbot / CodeRabbit findings on this head:
company.itemuses indicator digit + GS1 check digit_epc_classemits only values that pass_valid_class_urilot_key(same lot, different GTIN kept)Out of scope still: H3, graph files (#3731), FDA CSV / KDE joins / Preview labels owned by sibling Phase B PRs.
Out of scope
H3 ilmd, C1/C2 shipping/receiving field maps, H5 Preview labels (follow-up PRs).
Tests
tests/shared/test_epcis_lot_identity_sel598.py— synthetic URIs only (A-2165). No partner data. SEL-549 and SEL-590 holds stay.Review
Please have Hermes post
REVIEW: PASS|FAIL hermes <head_sha>on this exact head.Merge
Do not merge from this session. Needs green CI + PASS from a different engine. No force push / admin merge.
Head:
ebd8ea3b1cd3c29431b66fdb4fa26d4d3873deccNote
Medium Risk
Changes canonical
traceability_lot_codeshape and dedup/hash semantics for EPCIS events, but rollback is env-flagged and export/ingest paths are covered by targeted tests.Overview
SEL-598 (H2) adds shared lot normalization so ingest and export stop truncating LGTINs and GS1 Digital Link class URIs to bare lot tokens.
A new
epcis_lot_identitymodule parses full class URIs, deriveslot_tokenfor UI/rebuild paths, and gates behavior withLOT_IDENTITY_LOSSLESS(on by default;0/falserestores segment-onlytraceability_lot_codewrites).Canonical EPCIS normalization now prefers full class URIs from quantity classes/EPCs, runs ILMD and flat lot fields through
normalize_epcis_lot, and recordslot_tokenon transformation inputs alongside the stored lot key.**EPCIS export
_epc_classemits an stored full URI unchanged (including fromtraceability_lot_code) and useslot_token_onlyso GTIN+lot rebuilds never embed a full URI in the/10/lot-segmentsegment.Synthetic coverage lives in
test_epcis_lot_identity_sel598.py.Reviewed by Cursor Bugbot for commit 76eb2c7. Bugbot is set up for automated code reviews on this repo. Configure here.