Erupe/docs/technical-debt.md

Erupe Technical Debt & Suggested Next Steps

Last updated: 2026-03-05

This document tracks actionable technical debt items discovered during a codebase audit. It complements anti-patterns.md (which covers structural patterns) by focusing on specific, fixable items with file paths and line numbers.

Table of Contents

• High Priority
  • 1. Broken game features (gameplay-impacting TODOs)
  • 2. Test gaps on critical paths
• Medium Priority
  • 3. Logging anti-patterns
• Low Priority
  • 4. CI updates
• Completed Items
• Suggested Execution Order

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High Priority

1. Broken game features (gameplay-impacting TODOs)

These TODOs represent features that are visibly broken for players.

Location	Issue	Impact	Tracker
model_character.go:88,101,113	TODO: fix bookshelf data pointer for G10-ZZ, F4-F5, and S6 versions	Wrong pointer corrupts character save reads for three game versions. Fixed. Corrected offsets to 103928 (G1–Z2), 71928 (F4–F5), 23928 (S6) — validated via inter-version delta analysis and Ghidra decompilation of snj_db_get_housedata in the ZZ DLL.	#164
handlers_achievement.go:117	TODO: Notify on rank increase — always returns false	Achievement rank-up notifications are silently suppressed. Fixed. RE'd putDisplayed_achievement in ZZ DLL: sends opcode + 1 zero byte (no achievement ID). Added displayed_levels column to track per-character last-displayed levels; GetAchievement compares current vs displayed; DisplayedAchievement snapshots current levels.	#165
handlers_guild_info.go:443	TODO: Enable GuildAlliance applications — hardcoded true	Guild alliance applications are always open regardless of setting. Fixed. Added recruiting column to guild_alliances, wired OperateJoint actions 0x06/0x07, reads from DB.	#166
handlers_session.go:410	TODO(Andoryuuta): log key index off-by-one	Known off-by-one in log key indexing is unresolved Documented. RE'd from ZZ DLL: putRecord_log/putTerminal_log don't embed the key (size 0), so the off-by-one only matters in pre-ZZ clients and is benign server-side.	#167
handlers_session.go:551	TODO: This case might be <=G2	Uncertain version detection in switch case Documented. RE'd ZZ per-entry parser (FUN_115868a0) confirms 40-byte padding. G2 DLL analysis inconclusive (stripped, no shared struct sizes). Kept <=G1 boundary with RE documentation.	#167
handlers_session.go:714	TODO: Retail returned the number of clients in quests	Player count reported to clients does not match retail behavior Fixed. Added QuestReserved field to StageSnapshot that counts only clients in "Qs" stages, pre-collected under server lock to respect lock ordering.	#167
msg_mhf_add_ud_point.go:28	TODO: Parse is a stub — field meanings unknown	UD point packet fields unnamed, Build not implemented Fixed. RE'd putAdd_ud_point from ZZ DLL: two uint32 fields are QuestPoints (sum of 11 category accumulators) and BonusPoints (kiju prayer multiplier extra). Added diva_points table, repo methods, handler accumulation, and migration 0009.	#168

2. Test gaps on critical paths

All handler files now have test coverage.

Repository files with no store-level test file (17 total): Fixed. All 20 repo source files now have corresponding _test.go files. The split guild files (repo_guild_adventure.go, repo_guild_alliance.go, etc.) are covered by repo_guild_test.go. These are mock-based unit tests; SQL-level integration tests against a live database remain a future goal.

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Medium Priority

3. Logging anti-patterns

a) fmt.Sprintf inside structured logger calls (6 sites): Fixed. All 6 sites now use zap.Uint32/zap.Uint8/zap.String structured fields instead of fmt.Sprintf.

b) 20+ silently discarded SJIS encoding errors in packet parsing: Fixed. All call sites now use SJISToUTF8Lossy() which logs decode errors at slog.Debug level.

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Low Priority

4. CI updates

• codecov-action@v4 could be updated to v5 (current stable) Removed. Replaced with local go tool cover threshold check (no Codecov account needed).
• No coverage threshold is enforced — coverage is uploaded but regressions aren't caught Fixed. CI now fails if total coverage drops below 50% (current: ~58%).

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Completed Items

Items resolved since the original audit:

#	Item	Resolution
3	Sign server has no repository layer	Fully refactored with repo_interfaces.go, repo_user.go, repo_session.go, repo_character.go, and mock tests. All 8 previously-discarded error paths are now handled.
4	Split repo_guild.go	Split from 1004 lines into domain-focused files: repo_guild.go (466 lines, core CRUD), repo_guild_posts.go, repo_guild_alliance.go, repo_guild_adventure.go, repo_guild_hunt.go, repo_guild_cooking.go, repo_guild_rp.go.
6	Inconsistent transaction API	All call sites now use BeginTxx(context.Background(), nil) with deferred rollback.
7	LoopDelay config has no Viper default	viper.SetDefault("LoopDelay", 50) added in config/config.go.
—	Monthly guild item claim (handlers_guild.go:389)	Now tracks per-character per-type monthly claims via stamps table.
—	Handler test coverage (4 files)	Tests added for handlers_session.go, handlers_gacha.go, handlers_plate.go, handlers_shop.go.
—	Handler test coverage (handlers_commands.go)	62 tests covering all 12 commands, disabled-command gating, op overrides, error paths, raviente with semaphore, course enable/disable/locked, reload with players/objects.
—	Handler test coverage (handlers_data_paper.go)	20 tests covering all DataType branches (0/5/6/gift/>1000/unknown), ACK payload structure, earth succeed entry counts, timetable content, serialization round-trips, and paperGiftData table integrity.
—	Handler test coverage (5 files)	Tests added for handlers_seibattle.go (9 tests), handlers_kouryou.go (7 tests), handlers_scenario.go (6 tests), handlers_distitem.go (8 tests), handlers_guild_mission.go (5 tests in coverage5).
—	Entrance server raw SQL	Refactored to repository interfaces (repo_interfaces.go, repo_session.go, repo_server.go).
—	Guild daily RP rollover (handlers_guild_ops.go:148)	Implemented via lazy rollover in handlers_guild.go:110-119 using RolloverDailyRP(). Stale TODO removed.
—	Typos (sys_session.go, handlers_session.go)	"For Debuging" and "offical" typos already fixed in previous commits.
—	db != nil guard (handlers_session.go:322)	Investigated — this guard is intentional. Test servers run without repos; the guard protects the entire logout path from nil repo dereferences. Not a leaky abstraction.
2	Repo test coverage (17 files)	All 20 repo source files now have _test.go files with mock-based unit tests.
—	Bookshelf data pointer (#164)	Corrected pBookshelfData offsets for G1–Z2 (103928), F4–F5 (71928), S6 (23928). Validated via inter-version delta analysis and Ghidra decompilation of ZZ snj_db_get_housedata.
—	Guild nil panics (#171)	Three fixes merged post-RC1: nil guards for alliance guild lookups (aee5353), variable shadowing fix in scout list (8e79fe6), nil guards in cancel/answer scout handlers (8717fb9). Clan hall softlock resolved.
—	ecdMagic byte order (#174)	Corrected constant byte order in crypt_conn.go (10ac803).
—	Rengoku caching	Cached rengoku_data.bin at startup to avoid repeated disk reads (5b631d1).
—	rasta_id=0 save issue (#163)	SaveMercenary now skips rasta_id update when value is 0, preserving NULL for characters without a mercenary.
—	fmt.Printf in setup wizard	Replaced fmt.Printf in server/setup/setup.go with structured zap logging.

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Suggested Execution Order

Based on remaining impact:

1. Add tests for handlers_commands.go — Done. 62 tests covering all 12 commands (ban, timer, PSN, reload, key quest, rights, course, raviente, teleport, discord, playtime, help), disabled-command gating, op overrides, error paths, and initCommands.
2. Fix bookshelf data pointer (#164) — Done. Corrected offsets for G1–Z2, F4–F5, S6 via delta analysis + Ghidra RE
3. Fix achievement rank-up notifications (#165) — Done. RE'd putDisplayed_achievement from ZZ DLL; added displayed_levels column + service methods + migration 0008
4. Add coverage threshold to CI — Done. 50% floor enforced via go tool cover in CI; Codecov removed.
5. Fix guild alliance toggle (#166) — Done. recruiting column + OperateJoint allow/deny actions + DB toggle
6. Fix session handler retail mismatches (#167) — Documented. RE'd from ZZ DLL; log key off-by-one is benign server-side, player count fixed via QuestReserved.
7. Reverse-engineer MhfAddUdPoint fields (#168) — Done. RE'd from ZZ DLL: QuestPoints + BonusPoints, added diva_points table + migration 0009