FFL-2837: dynamic (rules-based) offline init plan - #1345
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Pull request overview
Adds planning documentation for FFL-2837 (“dynamic/rules-based offline init”) in the React Native SDK, outlining intended behavior, dependency needs in @datadog/flagging-core, risks, and a proposed RN implementation + test plan.
Changes:
- Add a detailed technical plan covering architecture, upstream gaps, risk analysis, and step-by-step implementation/testing.
- Add a Simplified Technical English version of the plan for broader review/accessibility.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.
| File | Description |
|---|---|
| dynamic_offline.plan.md | Detailed implementation plan, upstream dependency analysis, and risks/test plan for rules-based offline evaluation. |
| dynamic_offline_simplified.plan.md | Simplified Technical English version of the same plan for clearer cross-team review. |
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| Use this existing flow: | ||
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| ```text | ||
| configurationFromString -> setConfiguration -> evaluate |
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| # FFL-2837 — Dynamic (rules-based) offline init in dd-sdk-reactnative | |||
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| **Jira:** [FFL-2837 — Building Blocks API for dynamic offline init in ReactNative SDK](https://datadoghq.atlassian.net/browse/FFL-2837) | |||
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| - [Portable Flag Configuration RFC](https://docs.google.com/document/d/1OWNBtXtSk535VXqf-9fqsAmU9W8kpFLAwxYi2y1qyQQ/edit?pli=1&tab=t.0#heading=h.n52036mkzewg) (local snapshot: `./Portable-Flag-Configuration-RFC.md`, repo root, untracked) — defines the building blocks: `ConfigurationWire`, `configurationFromString/ToString`, `CoreProvider`, fetch fns, hooks. | ||
| - [Offline Initialization for Feature Flagging RFC](https://docs.google.com/document/d/1q1GlEbAgCGuO1OWfGbmKQkk5Oo-rE7YQwq29kMJJ4II/edit?pli=1&tab=t.0#heading=h.rnd972k0hiyer) (local snapshot: `./Offline-Initialization-for-Feature-Flagging.md`, repo root, untracked) — offline recipes built from those blocks; the operation is always `configurationFromString(wire) → provider.setConfiguration(config) → evaluate(...)`. | ||
| - [ConfigurationWire (Confluence)](https://datadoghq.atlassian.net/wiki/spaces/PANA/pages/5141725646/ConfigurationWire) — the published wire spec. Its **protobuf/base64** rules encoding is the intended target (see §2.5), even though the current code still uses JSON. | ||
| - **RFC: Obfuscation for rules-based client configs** (local: `./RFC_Obfuscation_for_rules-based_client configs.md`, 2026-07-10, first draft, one approval) — defines the obfuscation design for client rules: per-flag opt-in switch, salted `ONE_OF_SHA256`/`NOT_ONE_OF_SHA256` operators (server-compatible, engine-evaluated), binary structure format, and "document what's exposed". Answers most of our obfuscation open question — see G6/D7. |
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| # FFL-2837 — Dynamic Offline PR Stack | ||
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| This document uses Simplified Technical English. |
sbarrio
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barboraplasovska and
sbarrio
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barboraplasovska
July 24, 2026 07:06
sbarrio
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Jul 24, 2026
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| FFL-2837 adds the **rules-based** (dynamic) offline flow: | ||
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| - Customer loads a **rules-based** configuration (Universal Flag Configuration) via `setConfiguration` |
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So setConfiguration can be used both to set a precomputed flag config and also the rules used to evaluate and compute it against a context?
Is there any particular reason for this and not have a specific and more clearly named function to set the rules?
I fear the API might end up being too broad for customers to clearly understand what does what and which precise calls they need to make to achieve the setup they want.
sbarrio
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Jul 24, 2026
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| ## 2. Current state of `@datadog/flagging-core` |
Contributor
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What's the expected size footprint of this package?, also, is this module stable?, we need to keep in mind that we don't do major releases that often so if any functionality of this module is to be exposed on the public SDK API we need to be sure that this does not introduce breaking changes often.
This was referenced Jul 24, 2026
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Pull request overview
Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.
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dynamic_offline_pr_stack.plan.md:3
- The PR description says this PR adds
dynamic_offline.plan.md(detailed plan), but the branch currently addsdynamic_offline_pr_stack.plan.mdinstead. This mismatch makes it hard for reviewers to find the detailed plan document; either add/rename the detailed plan file as described, or update the PR description to match the actual files in the PR.
# FFL-2837 — Dynamic Offline PR Stack
This document uses Simplified Technical English.
Planning doc for rules-based (dynamic) offline feature-flag init in the React Native SDK: gaps to bridge in @datadog/flagging-core, explicit implementation steps, test plan, and risks/unknowns. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Resolve five of the plan's open questions: gate rules exposure on doLog (D3), keep two evaluation paths (D4), accept static-import bundle cost and reject dynamic import (D5), no offline opt-in gate for rules (D6), treat obfuscation/hashing as upstream (D7). Punt the flagging-core version/protobuf questions (Q1-Q2) to coordinate with upstream owners. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Point the Portable Flag Configuration and Offline Initialization references at their source Google Docs, keeping the local snapshot filenames noted alongside. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Fold in the Obfuscation RFC (salted ONE_OF_SHA256 operators + binary structure) and the round-5/6 review findings. Obfuscation operators are absent from 2.0.1 and today silently fall back to DEFAULT, so unknown operators must be rejected as GENERAL, derived from the pinned OperatorType rather than an RN-maintained set. Sync SHA-256 is new bundle mass (Hermes+JSC). The hash protocol is unspecified and needs cross-SDK vectors plus malformed-condition load validation. Unsupported operators invalidate the rules branch only, keeping a valid precomputed sibling. Corrected the threat model and the full "what stays visible" UFC list. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Pull request overview
Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.
Comments suppressed due to low confidence (3)
dynamic_offline_simplified.plan.md:19
- This “Upstream PR #344” reference is ambiguous without an explicit repo/link (it can be read as a PR in this repo). Consider fully qualifying it like other cross-repo references.
Upstream PR #344 now defines the expected implementation contract.
dynamic_offline_simplified.plan.md:9
- The PR references are written as plain “#NNN”, which is ambiguous inside this repository (e.g., “#344” could be interpreted as a dd-sdk-reactnative PR). Using explicit links here will keep the plan unambiguous over time.
This issue also appears on line 19 of the same file.
**Upstream references:** DataDog/openfeature-js-client PRs #343, #344, and #336
dynamic_offline_pr_stack.plan.md:26
- These references to “Upstream PR #344” / “PR #336” are ambiguous without a repo name/link (they can be interpreted as PRs in this repo). Using explicit links will make the stack plan clearer for readers.
Upstream PR #344 adds the generated Protobuf-ES rules parser, SHA-256 evaluation, validation, safe flag lookup, and React Native compatibility.
It adds `@bufbuild/protobuf` as a runtime dependency.
Its packed-package smoke test uses the Metro export conditions from this repository.
Upstream PR #336 uses that parser in the browser `CoreProvider`.
PR #336 also uses the safe upstream lookup for precomputed flags.
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Pull request stack
This description uses Simplified Technical English. Technical names and API names do not change.
Summary
This PR adds the implementation plans for FFL-2837. FFL-2837 adds dynamic rules-based offline feature flags to the React Native SDK. This PR does not change product code.
This branch starts from
develop. The existing SDK already supports precomputed offline configurations,OfflineProvider, andsetConfiguration.This PR adds these documents:
dynamic_offline_simplified.plan.mddefines the complete feature plan.dynamic_offline_pr_stack.plan.mddivides the implementation into three reviewable PRs.Feature behavior
setConfiguration.setContextchanges the active context.One provider supports precomputed data, rules data, and mixed data. The SDK selects the path for each resolution:
Upstream state
The latest published
@datadog/flagging-coreversion is 2.0.2. Version 2.0.2 does not contain the required rules wire contract.configuration.rules.response, protobuf and base64 decoding, independent branch parsing, per-flag validation, SHA-256 operators, safe flag lookup, rules serialization rejection, and a React Native Metro smoke test.CoreProviderand the combined coreevaluatefunction. React Native uses this work as an integration reference.The React Native implementation does not import unpublished package code. It uses a temporary legacy JSON compatibility wire with explicit
TODO(FFL-2837)markers.Implementation stack
FlagsClient.The temporary compatibility code must use the final
rules.responsecontract after PR #344 is published. The SDK must keep the original rules wire becauseconfigurationToStringcannot recreate the protobuf payload.Remaining gates
The implementation PRs remain drafts until these gates are complete.