CFG-01: zentraler-konfigurationsdienst
internal/cfgservice: Store (Schreiben/Historie) + Service (Lesen mit Vorrangregel + TTL-Cache, Default 5s, analog internal/flag). Genannt "cfgservice" statt "config", da internal/config bereits die Bootstrap- Konfiguration des Core-Prozesses selbst belegt. Store.Set schreibt aktuellen Stand (config_values) und Historieneintrag (config_value_history) atomar in einer Transaktion — eine Aenderung ohne Versionshistorie ist strukturell ausgeschlossen (Akzeptanzkriterium 2). Version wird pro (key, scope) monoton hochgezaehlt. Service.Resolve wendet die Vorrangregel an: Tenant-spezifischer Override (scope = Tenant-Slug) hat Vorrang vor globalem Default (scope = 'global'), faellt sauber zurueck wenn kein Override existiert (Akzeptanzkriterium 1). Invalidate erzwingt sofortiges Neuladen fuer den Schreiber, andere Instanzen sehen Aenderungen spaetestens nach der TTL. Pruefungen (ausgefuehrt auf root@192.168.1.131, go build/vet/test PASS): 1. Vorrangregel automatisiert getestet — TestService_TenantOverrideTakesPrecedenceOverGlobal: Tenant mit Override bekommt Tenant-Wert, Tenant ohne Override bekommt Global-Default. PASS. 2. Cache-Invalidierung nach Aenderung innerhalb dokumentierter Zeit gemessen — TestService_CacheInvalidationTiming: wirksam nach 154ms bei TTL=150ms (innerhalb Ziel+Toleranz), vorher nachweislich noch alter Stand. PASS. 3. Versionierungshistorie ueber mehrere Aenderungen nachvollzogen — TestStore_HistoryTracksAllChanges: 3 aufeinanderfolgende Aenderungen, Historie liefert alle 3 in korrekter Reihenfolge mit korrekten Versionsnummern. PASS. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
sysops
co-authored by
Claude Sonnet 5
Claude Sonnet 5
parent
8da9c67d08
commit
4180a26c6e
@@ -0,0 +1,88 @@
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package cfgservice
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import (
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"context"
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"errors"
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"sync"
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"time"
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)
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// DefaultCacheTTL ist die dokumentierte Cache-Invalidierungszeit
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// (Akzeptanzkriterium 2 / Pruefung 2 in diesem Ticket bezieht sich auf die
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// Aenderungsnachvollziehbarkeit — die Cache-Frist selbst folgt demselben
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// Muster wie internal/flag.DefaultCacheTTL).
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const DefaultCacheTTL = 5 * time.Second
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type cacheEntry struct {
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value Value
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expiresAt time.Time
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}
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// Service ist die Leseseite mit Vorrangregel (Akzeptanzkriterium 1:
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// Tenant-Override vor Global-Default) und lokalem TTL-Cache.
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type Service struct {
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store *Store
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ttl time.Duration
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mu sync.RWMutex
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cache map[string]cacheEntry // Schluessel: key + "\x00" + tenantSlug
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}
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func NewService(store *Store, ttl time.Duration) *Service {
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if ttl <= 0 {
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ttl = DefaultCacheTTL
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}
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return &Service{store: store, ttl: ttl, cache: make(map[string]cacheEntry)}
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}
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func cacheKey(key, tenantSlug string) string {
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return key + "\x00" + tenantSlug
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}
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// Resolve liefert den Konfigurationswert fuer einen Tenant: ein
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// Tenant-spezifischer Override hat Vorrang vor dem globalen Default
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// (Akzeptanzkriterium 1 / Pruefung 1). tenantSlug == "" wertet nur den
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// globalen Wert aus.
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func (s *Service) Resolve(ctx context.Context, tenantSlug, key string) (Value, error) {
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ck := cacheKey(key, tenantSlug)
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s.mu.RLock()
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entry, exists := s.cache[ck]
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fresh := exists && time.Now().Before(entry.expiresAt)
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s.mu.RUnlock()
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if fresh {
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return entry.value, nil
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}
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v, err := s.resolveUncached(ctx, tenantSlug, key)
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if err != nil {
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return Value{}, err
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}
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s.mu.Lock()
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s.cache[ck] = cacheEntry{value: v, expiresAt: time.Now().Add(s.ttl)}
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s.mu.Unlock()
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return v, nil
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}
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func (s *Service) resolveUncached(ctx context.Context, tenantSlug, key string) (Value, error) {
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if tenantSlug != "" {
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v, err := s.store.Get(ctx, key, tenantSlug)
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if err == nil {
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return v, nil
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}
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if !errors.Is(err, ErrNotFound) {
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return Value{}, err
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}
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}
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return s.store.Get(ctx, key, GlobalScope)
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}
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// Invalidate erzwingt beim naechsten Resolve-Aufruf ein sofortiges Neuladen
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// fuer einen bestimmten (key, tenantSlug) statt auf den TTL-Ablauf zu warten
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// — analog internal/flag.Service.Invalidate.
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func (s *Service) Invalidate(key, tenantSlug string) {
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s.mu.Lock()
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delete(s.cache, cacheKey(key, tenantSlug))
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s.mu.Unlock()
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}
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@@ -0,0 +1,114 @@
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package cfgservice
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import (
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"context"
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"testing"
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"time"
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)
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// Akzeptanzkriterium 1 + Pruefung 1: Tenant-Override hat Vorrang vor
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// Global-Default, automatisiert getestet.
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func TestService_TenantOverrideTakesPrecedenceOverGlobal(t *testing.T) {
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store, cleanup := setupStoreTest(t)
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defer cleanup()
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ctx := context.Background()
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if _, err := store.Set(ctx, "test_precedence_key", GlobalScope, "global-wert"); err != nil {
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t.Fatalf("set global: %v", err)
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}
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if _, err := store.Set(ctx, "test_precedence_key", "test_acme", "tenant-wert"); err != nil {
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t.Fatalf("set tenant: %v", err)
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}
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svc := NewService(store, time.Hour)
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got, err := svc.Resolve(ctx, "test_acme", "test_precedence_key")
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if err != nil {
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t.Fatalf("resolve mit override: %v", err)
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}
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if got.Value != "tenant-wert" {
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t.Fatalf("erwartet tenant-override, habe %q", got.Value)
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}
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gotOther, err := svc.Resolve(ctx, "test_anderer_tenant", "test_precedence_key")
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if err != nil {
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t.Fatalf("resolve ohne override: %v", err)
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}
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if gotOther.Value != "global-wert" {
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t.Fatalf("erwartet global-default fuer tenant ohne override, habe %q", gotOther.Value)
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}
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}
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// Akzeptanzkriterium 2 + Pruefung 2: Cache-Invalidierung nach
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// Konfigurationsaenderung innerhalb dokumentierter Zeit gemessen.
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func TestService_CacheInvalidationTiming(t *testing.T) {
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store, cleanup := setupStoreTest(t)
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defer cleanup()
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ctx := context.Background()
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const ttl = 150 * time.Millisecond
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if _, err := store.Set(ctx, "test_ttl_key", GlobalScope, "alt"); err != nil {
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t.Fatalf("set: %v", err)
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}
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svc := NewService(store, ttl)
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v, err := svc.Resolve(ctx, "", "test_ttl_key")
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if err != nil {
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t.Fatalf("resolve: %v", err)
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}
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if v.Value != "alt" {
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t.Fatalf("erwartet 'alt', habe %q", v.Value)
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}
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changedAt := time.Now()
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if _, err := store.Set(ctx, "test_ttl_key", GlobalScope, "neu"); err != nil {
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t.Fatalf("set: %v", err)
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}
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v, err = svc.Resolve(ctx, "", "test_ttl_key")
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if err != nil {
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t.Fatalf("resolve direkt nach aenderung: %v", err)
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}
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if v.Value != "alt" {
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t.Fatalf("cache haette den alten wert liefern sollen, habe %q", v.Value)
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}
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deadline := changedAt.Add(ttl + 100*time.Millisecond)
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for time.Now().Before(deadline) {
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v, err := svc.Resolve(ctx, "", "test_ttl_key")
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if err != nil {
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t.Fatalf("resolve: %v", err)
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}
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if v.Value == "neu" {
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t.Logf("aenderung wurde nach %s wirksam (ziel: innerhalb %s + toleranz)", time.Since(changedAt), ttl)
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return
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}
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time.Sleep(10 * time.Millisecond)
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}
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t.Fatalf("aenderung wurde nicht innerhalb von %s wirksam", deadline.Sub(changedAt))
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}
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func TestService_InvalidateForcesImmediateRefresh(t *testing.T) {
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store, cleanup := setupStoreTest(t)
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defer cleanup()
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ctx := context.Background()
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if _, err := store.Set(ctx, "test_invalidate_key", GlobalScope, "alt"); err != nil {
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t.Fatalf("set: %v", err)
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}
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svc := NewService(store, time.Hour)
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_, _ = svc.Resolve(ctx, "", "test_invalidate_key")
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if _, err := store.Set(ctx, "test_invalidate_key", GlobalScope, "neu"); err != nil {
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t.Fatalf("set: %v", err)
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}
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svc.Invalidate("test_invalidate_key", "")
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v, err := svc.Resolve(ctx, "", "test_invalidate_key")
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if err != nil {
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t.Fatalf("resolve: %v", err)
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}
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if v.Value != "neu" {
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t.Fatalf("erwartet sofort sichtbaren neuen wert nach Invalidate, habe %q", v.Value)
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}
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}
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@@ -0,0 +1,129 @@
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// Package cfgservice implementiert Core CFG-01: den zentralen Dienst fuer
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// globale und tenant-spezifische Konfigurationswerte mit Versionierung und
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// Cache-Invalidierung. Andere Module lesen Konfiguration AUSSCHLIESSLICH
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// ueber dieses Paket (Akzeptanzkriterium 3), niemals ueber eigene Tabellen.
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package cfgservice
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import (
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"context"
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"errors"
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"fmt"
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"github.com/jackc/pgx/v5"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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// GlobalScope ist der reservierte Scope-Wert fuer globale Defaults — jeder
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// andere Scope-Wert ist ein Tenant-Slug (Akzeptanzkriterium 1).
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const GlobalScope = "global"
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var ErrNotFound = errors.New("cfgservice: kein wert fuer diesen key gefunden")
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type Value struct {
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Key string
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Scope string
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Value string
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Version int
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}
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type HistoryEntry struct {
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Key string
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Scope string
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Value string
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Version int
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}
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// Store ist die Schreib-/Verwaltungsseite. Set schreibt IMMER sowohl den
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// aktuellen Stand (config_values) als auch einen Historieneintrag
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// (config_value_history) in derselben Transaktion — eine Aenderung ohne
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// Versionshistorie ist strukturell ausgeschlossen (Akzeptanzkriterium 2).
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type Store struct {
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pool *pgxpool.Pool
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}
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func NewStore(pool *pgxpool.Pool) *Store {
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return &Store{pool: pool}
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}
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// Set schreibt einen neuen Wert fuer (key, scope) und erhoeht die Version um 1
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// (Version 1 bei erstmaligem Setzen).
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func (s *Store) Set(ctx context.Context, key, scope, value string) (Value, error) {
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if scope == "" {
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return Value{}, errors.New("cfgservice: scope darf nicht leer sein")
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}
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tx, err := s.pool.Begin(ctx)
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if err != nil {
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return Value{}, fmt.Errorf("transaktion starten: %w", err)
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}
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defer func() { _ = tx.Rollback(ctx) }()
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var currentVersion int
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err = tx.QueryRow(ctx, `SELECT version FROM config_values WHERE key = $1 AND scope = $2`, key, scope).Scan(¤tVersion)
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if err != nil && !errors.Is(err, pgx.ErrNoRows) {
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return Value{}, fmt.Errorf("aktuelle version lesen: %w", err)
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}
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newVersion := currentVersion + 1
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if _, err := tx.Exec(ctx, `
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INSERT INTO config_values (key, scope, value, version, updated_at)
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VALUES ($1, $2, $3, $4, now())
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ON CONFLICT (key, scope) DO UPDATE SET value = $3, version = $4, updated_at = now()
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`, key, scope, value, newVersion); err != nil {
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return Value{}, fmt.Errorf("wert speichern: %w", err)
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}
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if _, err := tx.Exec(ctx, `
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INSERT INTO config_value_history (key, scope, value, version, changed_at)
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VALUES ($1, $2, $3, $4, now())
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`, key, scope, value, newVersion); err != nil {
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return Value{}, fmt.Errorf("historie schreiben: %w", err)
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}
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if err := tx.Commit(ctx); err != nil {
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return Value{}, fmt.Errorf("transaktion committen: %w", err)
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}
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return Value{Key: key, Scope: scope, Value: value, Version: newVersion}, nil
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}
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// Get liefert den Wert fuer GENAU EINEN Scope (kein Vorrang-Fallback) — die
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// Vorrangregel (Tenant vor Global) lebt bewusst in Service.Resolve, damit
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// Store rein CRUD bleibt.
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func (s *Store) Get(ctx context.Context, key, scope string) (Value, error) {
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var v Value
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v.Key, v.Scope = key, scope
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err := s.pool.QueryRow(ctx, `
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SELECT value, version FROM config_values WHERE key = $1 AND scope = $2
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`, key, scope).Scan(&v.Value, &v.Version)
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if err != nil {
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if errors.Is(err, pgx.ErrNoRows) {
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return Value{}, ErrNotFound
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}
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return Value{}, fmt.Errorf("wert lesen: %w", err)
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}
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return v, nil
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}
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// History liefert die vollstaendige Versionshistorie eines (key, scope) in
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// aufsteigender Reihenfolge (Akzeptanzkriterium 2 / Pruefung 3).
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func (s *Store) History(ctx context.Context, key, scope string) ([]HistoryEntry, error) {
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rows, err := s.pool.Query(ctx, `
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SELECT key, scope, value, version FROM config_value_history
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WHERE key = $1 AND scope = $2 ORDER BY version
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`, key, scope)
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if err != nil {
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return nil, fmt.Errorf("historie abfragen: %w", err)
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}
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defer rows.Close()
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var out []HistoryEntry
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for rows.Next() {
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var h HistoryEntry
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if err := rows.Scan(&h.Key, &h.Scope, &h.Value, &h.Version); err != nil {
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return nil, fmt.Errorf("historieneintrag lesen: %w", err)
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}
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out = append(out, h)
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}
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return out, rows.Err()
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}
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@@ -0,0 +1,119 @@
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package cfgservice
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import (
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"context"
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"errors"
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"os"
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"testing"
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"github.com/jackc/pgx/v5/pgxpool"
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)
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func setupStoreTest(t *testing.T) (*Store, func()) {
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t.Helper()
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adminDSN := os.Getenv("TEST_ADMIN_DSN")
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if adminDSN == "" {
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t.Skip("TEST_ADMIN_DSN nicht gesetzt, Integrationstest uebersprungen")
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}
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ctx := context.Background()
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pool, err := pgxpool.New(ctx, adminDSN)
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if err != nil {
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t.Fatalf("pool: %v", err)
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}
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if _, err := pool.Exec(ctx, `
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CREATE TABLE IF NOT EXISTS config_values (
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key TEXT NOT NULL,
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scope TEXT NOT NULL CHECK (scope <> ''),
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value TEXT NOT NULL,
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version INT NOT NULL,
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updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
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PRIMARY KEY (key, scope)
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);
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CREATE TABLE IF NOT EXISTS config_value_history (
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id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
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key TEXT NOT NULL,
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scope TEXT NOT NULL,
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value TEXT NOT NULL,
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version INT NOT NULL,
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changed_at TIMESTAMPTZ NOT NULL DEFAULT now()
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);
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`); err != nil {
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t.Fatalf("schema: %v", err)
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}
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cleanup := func() {
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_, _ = pool.Exec(ctx, `DELETE FROM config_value_history WHERE key LIKE 'test\_%' ESCAPE '\'`)
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_, _ = pool.Exec(ctx, `DELETE FROM config_values WHERE key LIKE 'test\_%' ESCAPE '\'`)
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pool.Close()
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}
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return NewStore(pool), cleanup
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}
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func TestStore_SetIncrementsVersion(t *testing.T) {
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store, cleanup := setupStoreTest(t)
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defer cleanup()
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ctx := context.Background()
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v1, err := store.Set(ctx, "test_key", GlobalScope, "erster-wert")
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if err != nil {
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t.Fatalf("set 1: %v", err)
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}
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if v1.Version != 1 {
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t.Fatalf("erwartet version 1, habe %d", v1.Version)
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}
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v2, err := store.Set(ctx, "test_key", GlobalScope, "zweiter-wert")
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if err != nil {
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t.Fatalf("set 2: %v", err)
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}
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if v2.Version != 2 {
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t.Fatalf("erwartet version 2, habe %d", v2.Version)
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}
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got, err := store.Get(ctx, "test_key", GlobalScope)
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if err != nil {
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t.Fatalf("get: %v", err)
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}
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if got.Value != "zweiter-wert" || got.Version != 2 {
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t.Fatalf("aktueller wert unerwartet: %+v", got)
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}
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}
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// Akzeptanzkriterium 2 + Pruefung 3: Versionierungshistorie ueber mehrere
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// Aenderungen hinweg nachvollzogen.
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func TestStore_HistoryTracksAllChanges(t *testing.T) {
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store, cleanup := setupStoreTest(t)
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defer cleanup()
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ctx := context.Background()
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values := []string{"v1", "v2", "v3"}
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for _, v := range values {
|
||||
if _, err := store.Set(ctx, "test_history_key", GlobalScope, v); err != nil {
|
||||
t.Fatalf("set %q: %v", v, err)
|
||||
}
|
||||
}
|
||||
|
||||
history, err := store.History(ctx, "test_history_key", GlobalScope)
|
||||
if err != nil {
|
||||
t.Fatalf("history: %v", err)
|
||||
}
|
||||
if len(history) != 3 {
|
||||
t.Fatalf("erwartet 3 historieneintraege, habe %d", len(history))
|
||||
}
|
||||
for i, h := range history {
|
||||
if h.Version != i+1 || h.Value != values[i] {
|
||||
t.Fatalf("historieneintrag[%d] unerwartet: %+v", i, h)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func TestStore_GetUnknownKeyReturnsNotFound(t *testing.T) {
|
||||
store, cleanup := setupStoreTest(t)
|
||||
defer cleanup()
|
||||
ctx := context.Background()
|
||||
|
||||
if _, err := store.Get(ctx, "test_nie_gesetzt", GlobalScope); !errors.Is(err, ErrNotFound) {
|
||||
t.Fatalf("erwartet ErrNotFound, habe %v", err)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user