refactor notifications

Signed-off-by: Christian Richter <crichter@owncloud.com>

extensions/notifications/pkg/service/service.go

@@ -0,0 +1,64 @@
+package service
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+
+	"github.com/cs3org/reva/v2/pkg/events"
+	"github.com/owncloud/ocis/extensions/notifications/pkg/channels"
+	"github.com/owncloud/ocis/ocis-pkg/log"
+)
+
+type Service interface {
+	Run() error
+}
+
+func NewEventsNotifier(events <-chan interface{}, channel channels.Channel, logger log.Logger) Service {
+	return eventsNotifier{
+		logger:  logger,
+		channel: channel,
+		events:  events,
+		signals: make(chan os.Signal, 1),
+	}
+}
+
+type eventsNotifier struct {
+	logger  log.Logger
+	channel channels.Channel
+	events  <-chan interface{}
+	signals chan os.Signal
+}
+
+func (s eventsNotifier) Run() error {
+	signal.Notify(s.signals, syscall.SIGINT, syscall.SIGTERM)
+	s.logger.Debug().
+		Msg("eventsNotifier started")
+	for {
+		select {
+		case evt := <-s.events:
+			go func() {
+				switch e := evt.(type) {
+				case events.ShareCreated:
+					msg := "You got a share!"
+					var err error
+					if e.GranteeUserID != nil {
+						err = s.channel.SendMessage([]string{e.GranteeUserID.OpaqueId}, msg)
+					} else if e.GranteeGroupID != nil {
+						err = s.channel.SendMessageToGroup(e.GranteeGroupID, msg)
+					}
+					if err != nil {
+						s.logger.Error().
+							Err(err).
+							Str("event", "ShareCreated").
+							Msg("failed to send a message")
+					}
+				}
+			}()
+		case <-s.signals:
+			s.logger.Debug().
+				Msg("eventsNotifier stopped")
+			return nil
+		}
+	}
+}