consolidation of watcher

Change-Id: I9c82ef4d8a81af98afdfc34f5ad496bcade4af6a

watcher/common/config.py

@@ -24,7 +24,7 @@ from watcher import version
 def parse_args(argv, default_config_files=None):
     rpc.set_defaults(control_exchange='watcher')
     cfg.CONF(argv[1:],
-             project='watcher',
+             project='python-watcher',
              version=version.version_info.release_string(),
              default_config_files=default_config_files)
     rpc.init(cfg.CONF)

watcher/common/exception.py

@@ -29,7 +29,6 @@ from watcher.common.i18n import _
 from watcher.common.i18n import _LE
 from watcher.openstack.common import log as logging
 
-
 LOG = logging.getLogger(__name__)
 
 exc_log_opts = [
@@ -227,6 +226,61 @@ class PatchError(Invalid):
 
 # decision engine
 
+
+class BaseException(Exception):
+
+    def __init__(self, desc=""):
+        if (not isinstance(desc, basestring)):
+            raise IllegalArgumentException(
+                "Description must be an instance of str")
+
+        desc = desc.strip()
+
+        self._desc = desc
+
+    def get_description(self):
+        return self._desc
+
+    def get_message(self):
+        return "An exception occurred without a description."
+
+    def __str__(self):
+        return self.get_message()
+
+
+class IllegalArgumentException(BaseException):
+    def __init__(self, desc):
+        BaseException.__init__(self, desc)
+
+        if self._desc == "":
+            raise IllegalArgumentException("Description cannot be empty")
+
+    def get_message(self):
+        return self._desc
+
+
+class NoSuchMetric(BaseException):
+    def __init__(self, desc):
+        BaseException.__init__(self, desc)
+
+        if self._desc == "":
+            raise NoSuchMetric("No such metric")
+
+    def get_message(self):
+        return self._desc
+
+
+class NoDataFound(BaseException):
+    def __init__(self, desc):
+        BaseException.__init__(self, desc)
+
+        if self._desc == "":
+            raise NoSuchMetric("no rows were returned")
+
+    def get_message(self):
+        return self._desc
+
+
 class ClusterEmpty(WatcherException):
     message = _("The list of hypervisor(s) in the cluster is empty.'")