feat: publish an event after a new sparkle is saved to the database

2 files changed, 31 insertions, 8 deletions

diff --git a/app/db/in_memory_repository.go b/app/db/in_memory_repository.go
index 2aa1fed..1177662 100644
--- a/app/db/in_memory_repository.go
+++ b/app/db/in_memory_repository.go
@@ -5,20 +5,23 @@ import (
 	"sort"
 	"sync"
 
+	"github.com/xlgmokha/x/pkg/event"
 	"github.com/xlgmokha/x/pkg/x"
 	"gitlab.com/gitlab-org/software-supply-chain-security/authorization/sparkled/app/domain"
 	"gitlab.com/gitlab-org/software-supply-chain-security/authorization/sparkled/pkg/pls"
 )
 
 type inMemoryRepository[T domain.Entity] struct {
-	items []T
-	mu    sync.RWMutex
+	aggregator *event.TypedAggregator[T]
+	items      []T
+	mu         sync.RWMutex
 }
 
-func NewRepository[T domain.Entity]() domain.Repository[T] {
+func NewRepository[T domain.Entity](aggregator *event.TypedAggregator[T]) domain.Repository[T] {
 	return &inMemoryRepository[T]{
-		items: []T{},
-		mu:    sync.RWMutex{},
+		aggregator: aggregator,
+		items:      []T{},
+		mu:         sync.RWMutex{},
 	}
 }
 
@@ -50,5 +53,6 @@ func (r *inMemoryRepository[T]) Save(ctx context.Context, item T) error {
 	sort.Slice(r.items, func(i, j int) bool {
 		return r.items[i].GetID() > r.items[j].GetID()
 	})
+	r.aggregator.Publish("after.create", item)
 	return nil
 }
diff --git a/app/db/in_memory_repository_test.go b/app/db/in_memory_repository_test.go
index cfbab41..8e1e017 100644
--- a/app/db/in_memory_repository_test.go
+++ b/app/db/in_memory_repository_test.go
@@ -7,11 +7,13 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+	"github.com/xlgmokha/x/pkg/event"
 	"gitlab.com/gitlab-org/software-supply-chain-security/authorization/sparkled/app/domain"
 )
 
 func TestInMemoryRepository(t *testing.T) {
-	storage := NewRepository[*domain.Sparkle]()
+	aggregator := event.New[*domain.Sparkle]()
+	storage := NewRepository[*domain.Sparkle](aggregator)
 
 	t.Run("Save", func(t *testing.T) {
 		t.Run("an invalid Sparkle", func(t *testing.T) {
@@ -30,8 +32,25 @@ func TestInMemoryRepository(t *testing.T) {
 			assert.Equal(t, "because", sparkles[0].Reason)
 		})
 
+		t.Run("publishes an event", func(t *testing.T) {
+			called := false
+			var payload *domain.Sparkle
+
+			aggregator.SubscribeTo("after.create", func(item *domain.Sparkle) {
+				called = true
+				payload = item
+			})
+
+			sparkle := &domain.Sparkle{Sparklee: "@tanuki", Reason: "because"}
+			require.NoError(t, storage.Save(t.Context(), sparkle))
+
+			require.True(t, called)
+			require.NotNil(t, payload)
+			assert.Equal(t, sparkle, payload)
+		})
+
 		t.Run("prevents race conditions", func(t *testing.T) {
-			repository := NewRepository[*domain.Sparkle]()
+			repository := NewRepository[*domain.Sparkle](aggregator)
 			ctx := context.Background()
 
 			numGoroutines := 100
@@ -92,7 +111,7 @@ func TestInMemoryRepository(t *testing.T) {
 	})
 
 	t.Run("All", func(t *testing.T) {
-		repository := NewRepository[*domain.Sparkle]()
+		repository := NewRepository[*domain.Sparkle](aggregator)
 		require.NoError(t, repository.Save(t.Context(), &domain.Sparkle{
 			Sparklee: "@tanuki",
 			Reason:   "because",