feat(datadog-ffe): server-side EVP flagevaluation payload + bincode-safe sidecar delivery#2117
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leoromanovsky wants to merge 9 commits into
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feat(datadog-ffe): server-side EVP flagevaluation payload + bincode-safe sidecar delivery#2117leoromanovsky wants to merge 9 commits into
leoromanovsky wants to merge 9 commits into
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…ure gate - Add telemetry/flagevaluation.rs with FfeFlagEvaluationBatch and FfeFlagEvaluationEvent types modeled on exposures.rs - Required fields: timestamp, flag.key, first_evaluation, last_evaluation, evaluation_count - Optional fields use skip_serializing_if = Option::is_none for omitempty semantics (reviewer concern #2 review:4477935835) - Context pruning helper prune_context() enforces 256 fields / 256 chars skip-not-truncate (reviewer concern #1 review:4477935835) - New Cargo feature flagevaluation-evp gates the module (parallel to exposure-events) - Gate telemetry module in lib.rs to include flagevaluation-evp feature - 30 tests pass (25 existing + 5 new); OTel evaluation_metrics.rs and exposures.rs are byte-for-byte unchanged
…P flusher - Add ffe_flagevaluation_flusher.rs: structural copy of ffe_exposures_flusher.rs with path constant EVP_FLAGEVALUATIONS_PATH = /evp_proxy/v2/api/v2/flagevaluations and batch type FfeFlagEvaluationBatch; fire-and-forget send_batch with non-2xx warn+drop and timeout via biased tokio::select! - Add SidecarAction::FfeFlagEvaluationBatch variant to mod.rs enum; re-export FfeFlagEvaluationBatch from datadog-ffe telemetry module - Route SidecarAction::FfeFlagEvaluationBatch in sidecar_server.rs to ffe_flagevaluation_flusher::send_batch (parallel to FfeExposureBatch arm) - Add exhaust arm for new variant in telemetry.rs process_actions match - Enable flagevaluation-evp feature on datadog-ffe dep in sidecar Cargo.toml - 40 sidecar tests pass (3 new: posts_to_evp_proxy, non_2xx_does_not_panic, timeout_returns_without_waiting); OTel FfeEvaluationMetric path untouched
The worker->sidecar IPC serializes SidecarAction with bincode (non-self-describing). serde_json::Value (deserialize_any) and #[serde(skip_serializing_if)] both make bincode deserialize fail, so the sidecar silently dropped every FfeFlagEvaluationBatch ('IPC serve: failed to decode request') while the worker enqueue still returned ok.
- Carry pruned context as a JSON-object string (Option<String>); remove all skip_serializing_if from the wire types (keep #[serde(default)] for deserialize).
- Re-expand the context string into a JSON object and strip null/false/empty placeholders in ffe_flagevaluation_flusher::build_payload (POST shape unchanged; degraded tier carries no null placeholders).
- Add enqueue_actions_reliable (checked blocking send + reconnect-retry) for one-shot FFE batches; best-effort enqueue_actions left unchanged for high-volume telemetry.
- Add a bincode round-trip test for FfeFlagEvaluationBatch (mixed Some/None fields) to lock the wire-codec contract.
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About This ReportThis report tracks Clippy allow annotations for specific rules, showing how they've changed in this PR. Decreasing the number of these annotations generally improves code quality. |
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📚 Documentation Check Results📦
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🔒 Cargo Deny Results📦
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Artifact Size Benchmark Reportaarch64-alpine-linux-musl
aarch64-unknown-linux-gnu
libdatadog-x64-windows
libdatadog-x86-windows
x86_64-alpine-linux-musl
x86_64-unknown-linux-gnu
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…46-ffe-flagevaluation-evp
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Motivation
PHP delivers server-side EVP
flagevaluationbatches through libdatadog and the sidecar. That path needs to preserve bincode IPC compatibility, coalesce PHP request-lifetime batches without hidden dimensions, and emit worker-schema-compatible EVP JSON without adding OpenFeaturereasonto payloads or aggregate keys.Changes
FfeFlagEvaluationBatchafter existing variants.context.evaluationover IPC as a JSON-object string and re-expands it to an object for outbound EVP JSON.false,"",{}, and[]in user context.reasonargument.targeting_rule.key.Decisions
reasonis not part of the native ABI, sidecar event, outbound EVP payload, or aggregation contract.Validation Evidence
cargo test -p datadog-sidecar ffe_flagevaluation_flusher --lib- PASS, 14 passed.cargo +nightly test -p datadog-php ffe:: --libfrom companiondd-trace-php- PASS, 21 passed../run.sh FEATURE_FLAGGING_AND_EXPERIMENTATION --library php --weblog apache-mod-8.2 -k "test_flag_eval_evp"fromsystem-tests-php- PASS, 8 passed, 2577 deselected in 63.53s.events=10001,total=10050,full_total=10000,degraded_count=1,degraded_total=50.