Erupe/docs/improvements.md

Erupe Improvement Plan

Analysis date: 2026-02-24

Actionable improvements identified during a codebase audit. Items are ordered by priority and designed to be tackled sequentially. Complements anti-patterns.md and technical-debt.md.

Table of Contents

• 1. Fix swallowed errors with nil-dereference risk
• 2. Fix bookshelf data pointer for three game versions
• 3. Add error feedback to parseChatCommand
• 4. Reconcile service layer docs vs reality
• 5. Consolidate GuildRepo mocks
• 6. Add mocks for 8 unmocked repo interfaces
• 7. Extract inline data tables from handler functions

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1. Fix swallowed errors with nil-dereference risk

Priority: High — latent panics triggered by any DB hiccup.

~30 sites use _, _ to discard repo/service errors. Three are dangerous because the returned value is used without a nil guard:

Location	Risk
handlers_guild_adventure.go:24,48,73	guild, _ := guildRepo.GetByCharID(...) — no nil guard, will panic on DB error
handlers_gacha.go:56	fp, gp, gt, _ := userRepo.GetGachaPoints(...) — balance silently becomes 0, enabling invalid transactions
handlers_house.go:167	7 return values from GetHouseContents, error discarded entirely

Additional sites that don't panic but produce silently wrong data:

Location	Issue
handlers_distitem.go:35,111,129	distRepo.List()/GetItems() errors become empty results, no logging
handlers_guild_ops.go:30,49	guildService.Disband()/Leave() errors swallowed (nil-safe due to result != nil guard, but invisible failures)
handlers_shop.go:125,131	Gacha type/weight lookups discarded
handlers_discord.go:34	bcrypt.GenerateFromPassword error swallowed (only fails on OOM)

Fix: Add error checks with logging and appropriate fail ACKs. For the three high-risk sites, add nil guards at minimum.

Status: Done. All swallowed errors fixed across 7 files:

• handlers_guild_adventure.go — 3 GetByCharID calls now check error and nil, early-return with ACK
• handlers_gacha.go — GetGachaPoints now checks error and returns zeroed response; GetStepupStatus logs error
• handlers_house.go — GetHouseContents now checks error and sends fail ACK; HasApplication moved inside nil guard to prevent nil dereference on ownGuild; GetMission and GetWarehouseNames now log errors
• handlers_distitem.go — 3 distRepo calls now log errors
• handlers_guild_ops.go — Disband and Leave service errors now logged
• handlers_shop.go — GetShopType, GetWeightDivisor, GetFpointExchangeList now log errors
• handlers_discord.go — bcrypt.GenerateFromPassword error now returns early with user-facing message

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2. Fix bookshelf data pointer for three game versions

Priority: High — corrupts character save reads.

From technical-debt.md: model_character.go:88,101,113 has TODO: fix bookshelf data pointer for G10-ZZ, F4-F5, and S6 versions. All three offsets are off by exactly 14810 vs the consistent delta pattern of other fields. Needs validation against actual save data.

Fix: Analyze save data from affected game versions to determine correct offsets. Apply fix and add regression test.

Status: Pending.

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3. Add error feedback to parseChatCommand

Priority: Medium — improves operator experience with low effort.

handlers_commands.go:71 is a 351-line switch statement dispatching 12 chat commands. Argument parsing errors (strconv, hex.DecodeString) are silently swallowed at lines 240, 256, 368, 369. Malformed commands silently use zero values instead of giving the operator feedback.

Fix: On parse error, send a chat message back to the player explaining the expected format, then return early. Each command's branch already has access to the session for sending messages.

Status: Done. All 4 sites now validate parse results and send the existing i18n error messages:

• hex.DecodeString (KeyQuest set) — sends kqf.set.error on invalid hex
• strconv.Atoi (Rights) — sends rights.error on non-integer
• strconv.ParseInt x/y (Teleport) — sends teleport.error on non-integer coords

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4. Reconcile service layer docs vs reality

Priority: Medium — documentation mismatch causes confusion for contributors.

The CLAUDE.md architecture section shows a clean handlers → svc_*.go → repo_*.go layering, but in practice:

• GuildService has 7 methods. GuildRepo has 68. Handlers call guildRepo directly ~60+ times across 7 guild handler files.
• The 4 services (GuildService, MailService, AchievementService, GachaService) were extracted for operations requiring cross-repo coordination (e.g., disband triggers mail), but the majority of handler logic goes directly to repos.

This isn't necessarily wrong — the services exist for multi-repo coordination, not as a mandatory pass-through.

Fix: Update the architecture diagram in CLAUDE.md to reflect the actual pattern: services are used for cross-repo coordination, handlers call repos directly for simple CRUD. Remove the implication that all handlers go through services. Alternatively, expand service coverage to match the documented architecture, but that is a much larger effort with diminishing returns.

Status: Pending.

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5. Consolidate GuildRepo mocks

Priority: Low — reduces friction for guild test authoring.

repo_mocks_test.go (1004 lines) has two separate GuildRepo mock types:

• mockGuildRepoForMail (67 methods, 104 lines) — used by mail tests
• mockGuildRepoOps (38 methods, 266 lines) — used by ops/scout tests, with configurable behavior via struct fields

The GuildRepo interface has 68 methods. Neither mock implements the full interface. Adding any new GuildRepo method requires updating both mocks or compilation fails.

Fix: Merge into a single mockGuildRepo with all 68 methods as no-op defaults. Use struct fields (as mockGuildRepoOps already does for ~15 methods) for configurable returns in tests that need specific behavior.

Status: Done. Merged into a single mockGuildRepo (936 lines, down from 1004). All 12 test files updated. Adding a new GuildRepo method now requires a single stub addition.

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6. Add mocks for 8 unmocked repo interfaces

Priority: Low — enables isolated handler tests for more subsystems.

8 of the 21 repo interfaces have no mock implementation: TowerRepo, FestaRepo, RengokuRepo, DivaRepo, EventRepo, MiscRepo, MercenaryRepo, CafeRepo.

Tests for those handlers either use stub handlers that skip repos or rely on integration tests. This limits the ability to write isolated unit tests.

Fix: Add no-op mock implementations for each, following the pattern established by existing mocks.

Status: Pending.

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7. Extract inline data tables from handler functions

Priority: Low — improves readability.

handlers_items.go:18 — handleMsgMhfEnumeratePrice (164 lines) embeds two large var data blocks inline in the function body. These are static data tables, not logic.

Fix: Extract to package-level var declarations or a dedicated data file (following the pattern of handlers_data_paper_tables.go).

Status: Pending.