Move share & sync to workers package #225

Signed-off-by: Michael Mayer <michael@liquidbytes.net>

internal/workers/workers.go

@@ -0,0 +1,53 @@
+package workers
+
+import (
+	"time"
+
+	"github.com/photoprism/photoprism/internal/config"
+	"github.com/photoprism/photoprism/internal/event"
+	"github.com/photoprism/photoprism/internal/mutex"
+)
+
+var log = event.Log
+var stop = make(chan bool, 1)
+
+func Start(conf *config.Config) {
+	ticker := time.NewTicker(5 * time.Minute) // TODO
+
+	go func() {
+		for {
+			select {
+			case <-stop:
+				log.Info("shutting down service workers")
+				ticker.Stop()
+				mutex.Share.Cancel()
+				mutex.Sync.Cancel()
+				return
+			case <-ticker.C:
+				if !mutex.Share.Busy() {
+					go func() {
+						// Start
+						s := NewShare(conf)
+						if err := s.Start(); err != nil {
+							log.Error(err)
+						}
+					}()
+				}
+
+				if !mutex.Sync.Busy() {
+					go func() {
+						// Start
+						s := NewSync(conf)
+						if err := s.Start(); err != nil {
+							log.Error(err)
+						}
+					}()
+				}
+			}
+		}
+	}()
+}
+
+func Stop() {
+	stop <- true
+}