feat(flagd-core): update fractional operator to CBOR encoding (v3) - #415
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feat(flagd-core): update fractional operator to CBOR encoding (v3)#415m-olko wants to merge 3 commits into
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Update fractional bucketing in openfeature-flagd-core to use canonical CBOR encoding and unsigned 32-bit MurmurHash3 per the latest flagd specification. - Implement number normalization for float/int consistency per specification - Support non-string targeting keys and null bucketing keys returning None - Use [flagKey, targetingKey] CBOR array for shorthand bucketing syntax - Update flagd-testbed submodule to v3.10.1 and select @fractional-v3 tests - Add unit tests for null handling, zero equivalence, float equivalence, and ordering Signed-off-by: Marcin Olko <molko@google.com>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe fractional operator now uses canonical CBOR hashing and supports non-string bucket keys. Validation covers numeric normalization, invalid weights, and encoding failures. Provider defaults, exports, e2e filters, context handling, event assertions, and test expectations were updated. ChangesFractional evaluation and provider alignment
Priority: ⬇️ Low — Defer the fractional bucketing update because it is a focused standards-alignment change with low review scope and no stated customer or external urgency. Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to Fractional evaluation behavior is being aligned with canonical hashing and non-string targeting keys, but string context values containing backslashes may still be altered before end-to-end evaluation, producing unexpected targeting outcomes. Sequence Diagram(s)sequenceDiagram
participant FractionalOperator
participant NormalizeNumbers
participant Cbor2
participant Hashing
FractionalOperator->>NormalizeNumbers: normalize bucket key
NormalizeNumbers-->>FractionalOperator: normalized key
FractionalOperator->>Cbor2: encode canonical CBOR
Cbor2-->>FractionalOperator: CBOR bytes
FractionalOperator->>Hashing: hash encoded bytes
Hashing-->>FractionalOperator: bucket value
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #415 +/- ##
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+ Coverage 95.64% 96.04% +0.39%
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Files 24 47 +23
Lines 1057 1796 +739
==========================================
+ Hits 1011 1725 +714
- Misses 46 71 +25 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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…verage Resolve test failures and incompatibilities introduced by bumping the flagd-testbed to v3.10.1, along with linting and coverage fixes: - Fix ruff SIM102 in tools/openfeature-flagd-core custom_ops.py - Add test for CBOR serialization failure to ensure 100% patch coverage - Update unit test expected values in openfeature-provider-flagd for CBOR bucketing - Configure file and RPC e2e test filters for fractional v2/v3 tags - Update default retry backoff max (5000) and grace period (10) per testbed v3.10.1 specification - Add missing 'error event handler should not have been executed' step definition from bumped testbed Signed-off-by: Marcin Olko <molko@google.com>
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September 4, 2026 09:42
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Inline comments:
In `@providers/openfeature-provider-flagd/tests/e2e/step/context_steps.py`:
- Line 35: Remove the backslash-pair replacement in update_context so String
values preserve literal backslashes when stored in
evaluation_context.attributes; only decode a deliberately defined test-data
encoding if one exists, and add coverage for an input containing two literal
backslashes.
In `@providers/openfeature-provider-flagd/tests/e2e/step/event_steps.py`:
- Line 101: Update the event assertion step around event_handles to reuse
assert_handlers with a bounded wait before checking for event_type. After the
wait completes, assert that no matching handle exists so late asynchronous
events cannot be missed.
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providers/openfeature-provider-flagd/openfeature/test-harnessproviders/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/config.pyproviders/openfeature-provider-flagd/src/openfeature/contrib/provider/flagd/resolvers/process/custom_ops.pyproviders/openfeature-provider-flagd/tests/e2e/file/conftest.pyproviders/openfeature-provider-flagd/tests/e2e/inprocess/conftest.pyproviders/openfeature-provider-flagd/tests/e2e/rpc/conftest.pyproviders/openfeature-provider-flagd/tests/e2e/step/context_steps.pyproviders/openfeature-provider-flagd/tests/e2e/step/event_steps.pyproviders/openfeature-provider-flagd/tests/test_targeting.pytools/openfeature-flagd-core/pyproject.tomltools/openfeature-flagd-core/src/openfeature/contrib/tools/flagd/core/targeting/custom_ops.pytools/openfeature-flagd-core/tests/test_targeting.py
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Signed-off-by: Marcin Olko <molko@google.com>
toddbaert
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Sep 10, 2026
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Looks good! Same as Java as far as I can tell, and testbed/tags match.
Just like Java, the only thing I would recommend is we agree on a release strategy. I started a slack conversation with you and @NeaguGeorgiana23
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This PR
Update fractional bucketing in openfeature-flagd-core to use canonical CBOR encoding and unsigned 32-bit MurmurHash3 per the latest flagd specification.
Implement number normalization for float/int consistency per specification
Support non-string targeting keys and null bucketing keys returning None
Use [flagKey, targetingKey] CBOR array for shorthand bucketing syntax
Update flagd-testbed submodule to v3.10.1 and select @fractional-v3 tests
Add unit tests for null handling, zero equivalence, float equivalence, and ordering
Related Issues
Fixes #324