Phase 2 — Backend Modules

Phase 2 — Backend Modules

Status: ✅ Complete
Completion Date: 2026-04-17
Lead: Petter Graff (CodeCraft)
Evidence: 20 modules, 22 migrations, 617 tests passing

Overview

Phase 2 implements 20 backend modules in Kotlin/Ktor, replacing the original Hono/TypeScript prototype.

Modules Ported (20)

Total: 30 modules (20 production, 10 support)
Total Tests: 617 (79 test files)

Database Migrations (22)

Total: 22 migrations (570 lines of SQL)

Dependency Injection (Koin 4.0.2)

File: backend/src/main/kotlin/no/alai/dropsrbija/plugins/DI.kt

Pattern: Constructor injection via Koin modules

Example:

val appModule = module {
    single<Database> { Database.connect(/* HikariCP config */) }
    single<JwtService> { JwtService(getProperty("JWT_SECRET")) }
    single<PhoneOtpService> { PhoneOtpService(get(), get()) }
    single<TransactionService> { TransactionService(get(), get()) }
    single<NbsIpsService> { NbsIpsService(get()) }
    single<AuditLogger> { AuditLogger(get()) }
}

fun Application.configureDI() {
    install(Koin) {
        slf4jLogger()
        modules(appModule)
    }
}

Services Injected: 28 (all modules)

Ktor Plugin Ordering

File: backend/src/main/kotlin/no/alai/dropsrbija/Application.kt

Order matters (e.g., Database before Routing, Auth before protected routes):

fun Application.module() {
    // 1. Core infrastructure
    configureEnvGuard()       // Fail fast on missing env vars
    configureDI()             // Dependency injection
    configureDatabase()       // PostgreSQL connection
    
    // 2. Observability
    configureOpenTelemetry()  // Distributed tracing
    configureSentry()         // Error tracking
    configureMetrics()        // Prometheus metrics
    
    // 3. Security
    configureCORS()           // CORS headers
    configureRateLimit()      // Rate limiting (Redis)
    configureAuthentication() // JWT validation
    
    // 4. HTTP
    configureSerialization()  // JSON (kotlinx.serialization)
    configureStatusPages()    // Error handling
    
    // 5. Application
    configureRouting()        // All route modules
}

Test Coverage (52%)

JaCoCo Report:

• Total Coverage: 52% (gate threshold)
• Unit Tests: 617 passing (79 files)
• Integration Tests: 11 passing (Testcontainers PostgreSQL)
• Coverage Gate: ./gradlew jacocoTestCoverageVerification (passes)

Why 52% (not 60%)?

• docker-java issue: Testcontainers hangs on M-series Macs in CI
• Workaround: Disabled integration tests in CI, unit-only coverage gate
• Fix pending: docker-java PR (expected Q3 2026)
• Target: 60% once integration tests re-enabled

Decision: D12 (CEO approved 52% gate as temporary)

Evidence Matrix

Lead: Petter Graff (CodeCraft)
Validation: Angie Jones (Proveo)
Commit Range: develop branch