bridgev2/networkinterface: add post-save callback for matrix messages

Author: tulir

bridgev2/networkinterface.go

@@ -284,6 +284,9 @@ type MatrixMessageResponse struct {
 	// If RemovePending is set, the bridge will remove the provided transaction ID from pending messages
 	// after saving the provided message to the database. This should be used with AddPendingToIgnore.
 	RemovePending networkid.TransactionID
+	// An optional function that is called after the message is saved to the database.
+	// Will not be called if the message is not saved for some reason.
+	PostSave func(context.Context, *database.Message)
 }
 
 type FileRestriction struct {

bridgev2/portal.go

@@ -928,6 +928,8 @@ func (portal *Portal) handleMatrixMessage(ctx context.Context, sender *UserLogin
 			err = portal.Bridge.DB.Message.Insert(ctx, message)
 			if err != nil {
 				log.Err(err).Msg("Failed to save message to database")
+			} else if resp.PostSave != nil {
+				resp.PostSave(ctx, message)
 			}
 			if resp.RemovePending != "" {
 				portal.outgoingMessagesLock.Lock()