[PATCH 2/4] uievent: add error to registerEventHandler return

[Ed Bartosh <ed.bartosh@linux.intel.com>]

Current code throws Exception("Could not register UI event handler")
if event handler can't be registered. The real reason of this is that
cooker is in busy state. Error message lacks information about this.

Added error message to the return value of registerEventHandler.
Included returned error message into the log message and exception
text.

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>

diff --git a/bitbake/lib/bb/server/xmlrpc.py b/bitbake/lib/bb/server/xmlrpc.py
index b7647c1..17eb28b 100644
--- a/bitbake/lib/bb/server/xmlrpc.py
+++ b/bitbake/lib/bb/server/xmlrpc.py
@@ -97,10 +97,10 @@ class BitBakeServerCommands():
 
         # we don't allow connections if the cooker is running
         if (self.cooker.state in [bb.cooker.state.parsing, bb.cooker.state.running]):
-            return None
+            return None, "Cooker is busy: %s" % bb.cooker.state.get_name(self.cooker.state)
 
         self.event_handle = bb.event.register_UIHhandler(s, True)
-        return self.event_handle
+        return self.event_handle, 'OK'
 
     def unregisterEventHandler(self, handlerNum):
         """
diff --git a/bitbake/lib/bb/ui/uievent.py b/bitbake/lib/bb/ui/uievent.py
index 7fc50c7..80686a6 100644
--- a/bitbake/lib/bb/ui/uievent.py
+++ b/bitbake/lib/bb/ui/uievent.py
@@ -52,19 +52,21 @@ class BBUIEventQueue:
         # giving up
 
         while self.EventHandler == None and count_tries < 5:
-            self.EventHandle = self.BBServer.registerEventHandler(self.host, self.port)
+            self.EventHandle, error = self.BBServer.registerEventHandler(self.host, self.port)
 
             if (self.EventHandle != None):
                 break
 
-            bb.warn("Could not register UI event handler %s:%d, retry" % (self.host, self.port))
+            errmsg = "Could not register UI event handler. Error: %s, " \
+                     "host %s, port %d" % (error, self.host, self.port)
+            bb.warn("%s, retry" % errmsg)
             count_tries += 1
             import time
             time.sleep(1)
 
 
         if self.EventHandle == None:
-            raise Exception("Could not register UI event handler")
+            raise Exception(errmsg)
 
         self.server = server
 
-- 
2.1.4