file & mem stores should emit delete events on purge (#338)

Signed-off-by: James Hillyerd <james@hillyerd.com>

pkg/storage/file/fstore.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/inbucket/inbucket/pkg/config"
 	"github.com/inbucket/inbucket/pkg/extension"
+	"github.com/inbucket/inbucket/pkg/message"
 	"github.com/inbucket/inbucket/pkg/storage"
 	"github.com/inbucket/inbucket/pkg/stringutil"
 	"github.com/rs/zerolog/log"
@@ -186,6 +187,17 @@ func (fs *Store) PurgeMessages(mailbox string) error {
 	mb := fs.mbox(mailbox)
 	mb.Lock()
 	defer mb.Unlock()
+
+	// Emit delete events.
+	if !mb.indexLoaded {
+		if err := mb.readIndex(); err != nil {
+			return err
+		}
+	}
+	for _, m := range mb.messages {
+		fs.extHost.Events.AfterMessageDeleted.Emit(message.MakeMetadata(m))
+	}
+
 	return mb.purge()
 }
 

pkg/storage/mem/store.go

@@ -144,16 +144,25 @@ func (s *Store) MarkSeen(mailbox, id string) error {
 
 // PurgeMessages deletes the contents of a mailbox.
 func (s *Store) PurgeMessages(mailbox string) error {
+	// Grab lock, copy messages, clear, and drop lock.
 	var messages map[string]*Message
 	s.withMailbox(mailbox, true, func(mb *mbox) {
 		messages = mb.messages
 		mb.messages = make(map[string]*Message)
 	})
-	if len(messages) > 0 && s.remove != nil {
+
+	// Process size/quota.
+	if s.remove != nil {
 		for _, m := range messages {
 			s.enforcerRemove(m)
 		}
 	}
+
+	// Emit delete events.
+	for _, m := range messages {
+		s.extHost.Events.AfterMessageDeleted.Emit(message.MakeMetadata(m))
+	}
+
 	return nil
 }
 

pkg/test/storage_suite.go

@@ -343,16 +343,33 @@ func testDelete(t *testing.T, store storage.Store, extHost *extension.Host) {
 func testPurge(t *testing.T, store storage.Store, extHost *extension.Host) {
 	mailbox := "fred"
 	subjects := []string{"alpha", "bravo", "charlie", "delta", "echo"}
+
+	// Subscribe to events.
+	eventListener := extHost.Events.AfterMessageDeleted.AsyncTestListener(len(subjects))
+
+	// Populate mailbox.
 	for _, subj := range subjects {
 		DeliverToStore(t, store, mailbox, subj, time.Now())
 	}
 	GetAndCountMessages(t, store, mailbox, len(subjects))
+
 	// Purge and verify.
 	err := store.PurgeMessages(mailbox)
-	if err != nil {
-		t.Fatal(err)
-	}
+	require.NoError(t, err)
 	GetAndCountMessages(t, store, mailbox, 0)
+
+	// Confirm events emitted.
+	gotEvents := []*event.MessageMetadata{}
+	for range subjects {
+		ev, err := eventListener()
+		if err != nil {
+			t.Error(err)
+			break
+		}
+		gotEvents = append(gotEvents, ev)
+	}
+	assert.Equal(t, len(subjects), len(gotEvents),
+		"expected delete event for each message in mailbox")
 }
 
 // testMsgCap verifies the message cap is enforced.