bitbake: event: Queue offline events for the UI

Messages printed when no UI is connected (e.g. memres) are currently lost.
Use the existing queue mechanism to queue these until a UI attaches, then
replay them. This isn't ideal but better than the current situation of
losing them entirely.

(Bitbake rev: cb241fb8544dfb05646dbae1a1b04e17878a466c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/event.py

@@ -212,6 +212,12 @@ def fire(event, d):
     if worker_fire:
         worker_fire(event, d)
     else:
+        # If messages have been queued up, clear the queue
+        global _uiready, ui_queue
+        if _uiready and ui_queue:
+            for queue_event in ui_queue:
+                fire_ui_handlers(queue_event, d)
+            ui_queue = []
         fire_ui_handlers(event, d)
 
 def fire_from_worker(event, d):
@@ -291,7 +297,10 @@ def register_UIHhandler(handler, mainui=False):
     _ui_logfilters[_ui_handler_seq] = UIEventFilter(level, debug_domains)
     return _ui_handler_seq
 
-def unregister_UIHhandler(handlerNum):
+def unregister_UIHhandler(handlerNum, mainui=False):
+    if mainui:
+        global _uiready
+        _uiready = False
     if handlerNum in _ui_handlers:
         del _ui_handlers[handlerNum]
     return

bitbake/lib/bb/server/process.py

@@ -137,7 +137,7 @@ class ProcessServer(Process, BaseImplServer):
                 logger.exception('Running command %s', command)
 
         self.event_queue.close()
-        bb.event.unregister_UIHhandler(self.event_handle.value)
+        bb.event.unregister_UIHhandler(self.event_handle.value, True)
         self.command_channel.close()
         self.cooker.shutdown(True)
         self.quitout.close()

bitbake/lib/bb/server/xmlrpc.py

@@ -125,7 +125,7 @@ class BitBakeServerCommands():
         """
         Unregister a remote UI Event Handler
         """
-        return bb.event.unregister_UIHhandler(handlerNum)
+        return bb.event.unregister_UIHhandler(handlerNum, True)
 
     def runCommand(self, command):
         """