Simplify handling of regular fields in LUQuery*

For fields that correspond directly to an object's field, we can
simplify the handling. The patch also adds the new 'uuid' fields to
objects so that it can be queried.
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

lib/cmdlib.py

@@ -2279,6 +2279,10 @@ class LUQueryNodes(NoHooksLU):
   """
   _OP_REQP = ["output_fields", "names", "use_locking"]
   REQ_BGL = False
+
+  _SIMPLE_FIELDS = ["name", "serial_no", "ctime", "mtime", "uuid",
+                    "master_candidate", "offline", "drained"]
+
   _FIELDS_DYNAMIC = utils.FieldSet(
     "dtotal", "dfree",
     "mtotal", "mnode", "mfree",
@@ -2286,16 +2290,12 @@ class LUQueryNodes(NoHooksLU):
     "ctotal", "cnodes", "csockets",
     )
 
-  _FIELDS_STATIC = utils.FieldSet(
-    "name", "pinst_cnt", "sinst_cnt",
+  _FIELDS_STATIC = utils.FieldSet(*[
+    "pinst_cnt", "sinst_cnt",
     "pinst_list", "sinst_list",
     "pip", "sip", "tags",
-    "serial_no", "ctime", "mtime",
-    "master_candidate",
     "master",
-    "offline",
-    "drained",
-    "role",
+    "role"] + _SIMPLE_FIELDS
     )
 
   def ExpandNames(self):
@@ -2396,8 +2396,8 @@ class LUQueryNodes(NoHooksLU):
     for node in nodelist:
       node_output = []
       for field in self.op.output_fields:
-        if field == "name":
-          val = node.name
+        if field in self._SIMPLE_FIELDS:
+          val = getattr(node, field)
         elif field == "pinst_list":
           val = list(node_to_primary[node.name])
         elif field == "sinst_list":
@@ -2412,20 +2412,8 @@ class LUQueryNodes(NoHooksLU):
           val = node.secondary_ip
         elif field == "tags":
           val = list(node.GetTags())
-        elif field == "serial_no":
-          val = node.serial_no
-        elif field == "ctime":
-          val = node.ctime
-        elif field == "mtime":
-          val = node.mtime
-        elif field == "master_candidate":
-          val = node.master_candidate
         elif field == "master":
           val = node.name == master_node
-        elif field == "offline":
-          val = node.offline
-        elif field == "drained":
-          val = node.drained
         elif self._FIELDS_DYNAMIC.Matches(field):
           val = live_data[node.name].get(field, None)
         elif field == "role":
@@ -3983,6 +3971,8 @@ class LUQueryInstances(NoHooksLU):
   """
   _OP_REQP = ["output_fields", "names", "use_locking"]
   REQ_BGL = False
+  _SIMPLE_FIELDS = ["name", "os", "network_port", "hypervisor",
+                    "serial_no", "ctime", "mtime", "uuid"]
   _FIELDS_STATIC = utils.FieldSet(*["name", "os", "pnode", "snodes",
                                     "admin_state",
                                     "disk_template", "ip", "mac", "bridge",
@@ -3995,9 +3985,8 @@ class LUQueryInstances(NoHooksLU):
                                     r"(nic)\.(bridge)/([0-9]+)",
                                     r"(nic)\.(macs|ips|modes|links|bridges)",
                                     r"(disk|nic)\.(count)",
-                                    "serial_no", "hypervisor", "hvparams",
-                                    "ctime", "mtime",
-                                    ] +
+                                    "hvparams",
+                                    ] + _SIMPLE_FIELDS +
                                   ["hv/%s" % name
                                    for name in constants.HVS_PARAMETERS] +
                                   ["be/%s" % name
@@ -4100,10 +4089,8 @@ class LUQueryInstances(NoHooksLU):
                                  nic.nicparams) for nic in instance.nics]
       for field in self.op.output_fields:
         st_match = self._FIELDS_STATIC.Matches(field)
-        if field == "name":
-          val = instance.name
-        elif field == "os":
-          val = instance.os
+        if field in self._SIMPLE_FIELDS:
+          val = getattr(instance, field)
         elif field == "pnode":
           val = instance.primary_node
         elif field == "snodes":
@@ -4180,16 +4167,6 @@ class LUQueryInstances(NoHooksLU):
           val = _ComputeDiskSize(instance.disk_template, disk_sizes)
         elif field == "tags":
           val = list(instance.GetTags())
-        elif field == "serial_no":
-          val = instance.serial_no
-        elif field == "ctime":
-          val = instance.ctime
-        elif field == "mtime":
-          val = instance.mtime
-        elif field == "network_port":
-          val = instance.network_port
-        elif field == "hypervisor":
-          val = instance.hypervisor
         elif field == "hvparams":
           val = i_hv
         elif (field.startswith(HVPREFIX) and