only download while online

oml/downloads.py

@@ -41,21 +41,31 @@ class Downloads(Thread):
                 if state.nodes.is_online(u.id):
                     logger.debug('DOWNLOAD %s %s', t.item, u)
                     r = state.nodes.download(u.id, t.item)
-                    logger.debug('download ok? %s', r)
                     return True
         return False
 
     def run(self):
-        time.sleep(2)
+        self.wait(10)
         while self._running:
+            self.wait_online()
             with db.session():
                 self.download_next()
-            time.sleep(0.5)
+            self.wait(10)
 
     def join(self):
         self._running = False
         return Thread.join(self)
 
+    def wait_online(self):
+        while not state.online:
+            self.wait(5)
+
+    def wait(self, timeout):
+        step = min(timeout, 1)
+        while self._running and timeout > 0:
+            time.sleep(step)
+            timeout -= step
+
 class ScrapeThread(Thread):
 
     def __init__(self):