DiunDashboard/.planning/phases/02-backend-refactor/02-02-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
02-backend-refactor	02	http-handlers	server-struct dependency-injection store-interface test-isolation in-memory-sqlite refactor	phase provides 02-01 Store interface (9 methods), SQLiteStore, RunMigrations	Server struct with Store field and webhookSecret field NewServer constructor wiring Store and secret All 6 handlers converted to *Server methods calling s.store.X() NewTestServer / NewTestServerWithSecret helpers for isolated per-test databases main.go wiring sql.Open -> RunMigrations -> NewSQLiteStore -> NewServer -> routes	03-postgresql (PostgreSQLStore will implement same Store interface; Server struct accepts any Store)	added patterns Server struct pattern - all handler dependencies injected via constructor, no package-level globals export_test.go internal helpers (TestUpsertEvent, TestGetUpdatesMap) - access unexported fields without exposing Store accessor Per-test in-memory SQLite database via NewTestServer() - eliminates shared state between tests NewTestServerWithSecret for auth-enabled test scenarios	created modified pkg/diunwebhook/diunwebhook.go pkg/diunwebhook/export_test.go pkg/diunwebhook/diunwebhook_test.go cmd/diunwebhook/main.go	Option B for test store access: internal helpers in export_test.go (TestUpsertEvent, TestGetUpdatesMap) instead of exported Store() accessor - keeps store field unexported t.Errorf used inside goroutines in TestConcurrentUpdateEvent (t.Fatalf is not safe from non-test goroutines) _ modernc.org/sqlite blank import moved from diunwebhook.go to main.go and migrate.go - driver registration happens where needed	Server struct: HTTP handlers as methods on *Server, all deps injected at construction NewTestServer pattern: each test creates its own in-memory SQLite DB via RunMigrations + NewSQLiteStore + NewServer export_test.go internal methods: (s *Server) TestUpsertEvent / TestGetUpdatesMap access s.store without exporting Store field	REFAC-01 REFAC-02 REFAC-03	3min	2026-03-23

Phase 02 Plan 02: Server Struct Refactor and Test Isolation Summary

*Server struct with Store injection, globals removed, all 6 handlers as Server methods calling s.store.X(), per-test in-memory databases via NewTestServer

Performance

• Duration: ~3 min
• Started: 2026-03-23T21:02:53Z
• Completed: 2026-03-23T21:05:09Z
• Tasks: 2
• Files modified: 4

Accomplishments

• Removed all package-level globals (db, mu, webhookSecret) from diunwebhook.go
• Removed InitDB, SetWebhookSecret, UpdateEvent, GetUpdates functions (replaced by Store and Server)
• Added Server struct with store Store and webhookSecret string fields
• Added NewServer(store Store, webhookSecret string) *Server constructor
• Converted all 6 handler functions to *Server methods using s.store.X() for all persistence
• Rewrote export_test.go: NewTestServer, NewTestServerWithSecret, TestUpsertEvent, TestGetUpdatesMap helpers
• Rewrote diunwebhook_test.go: every test creates its own isolated in-memory database (no shared global state)
• Updated main.go: sql.Open -> RunMigrations -> NewSQLiteStore -> NewServer -> route registration
• All 35 tests pass against the new Server/Store architecture

Task Commits

Each task was committed atomically:

1. Task 1: Convert diunwebhook.go to Server struct and update main.go - 78543d7 (feat)
2. Task 2: Rewrite export_test.go and update all tests for Server/Store - e35b4f8 (test)

Files Created/Modified

• pkg/diunwebhook/diunwebhook.go - Server struct, NewServer constructor, all 6 handlers as *Server methods; globals and standalone functions removed
• pkg/diunwebhook/export_test.go - NewTestServer, NewTestServerWithSecret, (s *Server) TestUpsertEvent, TestGetUpdates, TestGetUpdatesMap
• pkg/diunwebhook/diunwebhook_test.go - All 35 tests rewritten to use NewTestServer per-test; no shared state; no TestMain
• cmd/diunwebhook/main.go - Full replacement: sql.Open -> RunMigrations -> NewSQLiteStore -> NewServer -> route registration with srv.XHandler

Decisions Made

• Test store access via internal helper methods in export_test.go (Option B) — avoids exposing Store field publicly while still letting tests call UpsertEvent/GetUpdates
• t.Errorf used inside goroutine in TestConcurrentUpdateEvent — t.Fatalf is not safe from non-test goroutines (pre-existing issue resolved)
• _ "modernc.org/sqlite" blank import moved to main.go (and already in migrate.go) — driver registered where *sql.DB is opened

Deviations from Plan

None - plan executed exactly as written.

Known Stubs

None.

Self-Check: PASSED

• pkg/diunwebhook/diunwebhook.go: FOUND
• pkg/diunwebhook/export_test.go: FOUND
• pkg/diunwebhook/diunwebhook_test.go: FOUND
• cmd/diunwebhook/main.go: FOUND
• Commit 78543d7: FOUND
• Commit e35b4f8: FOUND
• All 35 tests pass: VERIFIED (go test -v -count=1 ./pkg/diunwebhook/)

Next Phase Readiness

• Server struct accepts any Store implementation — PostgreSQL store can be introduced in Phase 3 without touching handlers
• RunMigrations called in main.go before store creation — Phase 3 just needs to add a postgres migration variant
• Per-test isolation via NewTestServer is the established pattern — Phase 3 tests can follow the same approach
• All acceptance criteria verified: no globals, no SQL in handlers, s.store.X() pattern throughout, main.go wiring complete

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Phase: 02-backend-refactor Completed: 2026-03-23