[dnf] simplify threading

use framework threading to simplify the dnf module

see #692

bumblebee_status/modules/contrib/dnf.py

@@ -5,13 +5,8 @@
 Requires the following executable:
     * dnf
 
-Parameters:
-    * dnf.interval: Time in minutes between two consecutive update checks (defaults to 30 minutes)
-
 """
 
-import threading
-
 import core.event
 import core.module
 import core.widget
@@ -20,46 +15,13 @@ import core.decorators
 import util.cli
 
 
-def get_dnf_info(widget):
-    res = util.cli.execute("dnf updateinfo", ignore_errors=True)
-
-    security = 0
-    bugfixes = 0
-    enhancements = 0
-    other = 0
-    for line in res.split("\n"):
-        if not line.startswith(" "):
-            continue
-        elif "ecurity" in line:
-            for s in line.split():
-                if s.isdigit():
-                    security += int(s)
-        elif "ugfix" in line:
-            for s in line.split():
-                if s.isdigit():
-                    bugfixes += int(s)
-        elif "hancement" in line:
-            for s in line.split():
-                if s.isdigit():
-                    enhancements += int(s)
-        else:
-            for s in line.split():
-                if s.isdigit():
-                    other += int(s)
-
-    widget.set("security", security)
-    widget.set("bugfixes", bugfixes)
-    widget.set("enhancements", enhancements)
-    widget.set("other", other)
-
-    core.event.trigger("update", [widget.module.id], redraw_only=True)
-
-
 class Module(core.module.Module):
     @core.decorators.every(minutes=30)
     def __init__(self, config, theme):
         super().__init__(config, theme, core.widget.Widget(self.updates))
 
+        self.background = True
+
     def updates(self, widget):
         result = []
         for t in ["security", "bugfixes", "enhancements", "other"]:
@@ -67,8 +29,37 @@ class Module(core.module.Module):
         return "/".join(result)
 
     def update(self):
-        thread = threading.Thread(target=get_dnf_info, args=(self.widget(),))
+        res = util.cli.execute("dnf updateinfo", ignore_errors=True)
-        thread.start()
+
+        security = 0
+        bugfixes = 0
+        enhancements = 0
+        other = 0
+        for line in res.split("\n"):
+            if not line.startswith(" "):
+                continue
+            elif "ecurity" in line:
+                for s in line.split():
+                    if s.isdigit():
+                        security += int(s)
+            elif "ugfix" in line:
+                for s in line.split():
+                    if s.isdigit():
+                        bugfixes += int(s)
+            elif "hancement" in line:
+                for s in line.split():
+                    if s.isdigit():
+                        enhancements += int(s)
+            else:
+                for s in line.split():
+                    if s.isdigit():
+                        other += int(s)
+
+        widget.set("security", security)
+        widget.set("bugfixes", bugfixes)
+        widget.set("enhancements", enhancements)
+        widget.set("other", other)
+
 
     def state(self, widget):
         cnt = 0