psf-memo-client/docs/reviews/like-tip-memo-summary.md

Architectural Review Summary — like-tip-memo

Task and commits reviewed

• Task: like-tip-memo
• Processed the refactorer handoff merge_and_process refactorer 6b7a7e2b86 and fast-forward merged the swarmforge-refactorer branch ending at 6b7a7e2b86 into swarmforge-architect, which carried:
  • eb9aa29 — specifier: added specs/like-tip-memo.feature (10 scenarios) and dev-docs/psf-memo-db-changes.md
  • dd0535d — coder: implemented the Memo like action (0x6d04) with optional author tip, the like/tip page controller, heart-icon + modal UI, and acceptance handlers
  • 6b7a7e2b86 — refactorer: reduced CRAP in the like/tip slice, consolidated rejection assertions, and added hex/like/property tests

Architectural findings and fixes applied

Reviewed UI/Core separation, dependency rule, information hiding/encapsulation, and local code quality.

1. UI/Core separation (good). Core behavior is cleanly split from UI:
   • src/services/memo-like.js (extends MemoAction) owns compose/validate/broadcast of the like OP_RETURN and optional tip, speaking only to an injected wallet.
   • src/services/like-tip-page.js (extends PageController) owns the modal page behavior (open/close/setTip/submit and error classification).
   • React (like-button.js, like-tip-modal.js, post-feed-item.js) is a thin shell over the testable services. Core is testable with no UI/IO.
2. Dependency rule (good). UI components depend inward on services; LikeTipPage → MemoLike → MemoAction. Wallet/network I/O stays behind the injected minimal-slp-wallet adapter. No low-level module reaches toward IO.
3. Information hiding / encapsulation (good). Txid hex encoding, tip validation (integer, dust floor, hard max, spendable balance), and the 0x6d04 wire prefix are encapsulated. hexToBytes was extracted to src/services/hex.js and is shared with memo-reply.js — a good cross-slice DRY consolidation.
4. Local code quality (good). Small, single-responsibility modules; CRAP for every like/tip function is at or below 6 with 100% coverage.
5. Boundary test gap closed (architect fix). Added three boundary unit tests to test/unit/memo-like.test.js:
   • a tip at exactly the hard maximum is accepted,
   • a wallet with exactly the dust-limit balance can make a pure like,
   • a tip at exactly the spendable balance is accepted. These kill the previously-surviving > -> >= / < -> <= boundary mutants and pin down the inclusive max/balance semantics.

Verification results

• Unit (node --test): 133/133 pass (including the 3 added boundary tests).
• Property (node --test test/property/*.test.js): 18/18 pass.
• Acceptance (normal): memo-new, post-memo, set-name, reply-memo, and like-tip-memo (10 scenarios) generated suites all pass.
• Mutation (mutate4javascript src/services/memo-like.js --mutate-all): 25 killed, 0 uncovered, 7 survived — all documented equivalents:
  • validate / validateTip {ok:true} returns are ignored by like() (dead return value),
  • like default tipSats = 0 (callers always pass the parsed tip),
  • _requireTipAddress / _buildTipOutput boundary mutations on tipSats ≤ 1 / authorAddress.length > 1 are unreachable because such tips are below the dust floor and rejected earlier.
• DRY (dry4javascript src/services/memo-like.js like-tip-page.js hex.js): no duplicate candidates.
• Gherkin acceptance mutation (soft) on like-tip-memo.feature: 16 executed, 4 killed, 12 survived, 0 errors. Every survivor is an expected soft survival: a mutated example value still yields the same asserted outcome (a still-invalid tip, a still-below-dust tip, or a tip/balance pair that still trips the same check).
• CRAP: all like/tip functions ≤ 6.0 (max _validateTipAmount 6.0), 100% coverage.

Suite status

Unit + property + acceptance all pass; source-level mutation kills all meaningful mutants with survivors documented as equivalents; DRY clean; CRAP within threshold.

Handoffs sent

• git_handoff → coder, refactorer (priority 00, task like-tip-memo), to review the architect commit (three boundary tests + tool-refreshed manifests; no source logic change).
• No handoff to the specifier: the architect produced no functional feature commit.

By architect.