1 files changed, 18 insertions, 0 deletions
diff --git a/src/python/openlmi/common/__init__.py b/src/python/openlmi/common/__init__.py
index 2d19515..baebcdb 100644
--- a/src/python/openlmi/common/__init__.py
+++ b/src/python/openlmi/common/__init__.py
@@ -22,3 +22,21 @@
 """
 Common utilities for OpenLMI python providers.
 """
+def parse_instance_id(instance_id, classname=None):
+    """
+    Parse InstanceID, check it has LMI:<classname>:<ID> format and return
+    the ID. Return None if the format is bad.
+    :param instance_id: (``string``) String to parse.
+    :param classname: (``string``) Name of class, whose InstanceID we parse.
+        If the classname is None, it won't be checked.
+    :returns: ``string`` with the ID.
+    """
+    parts = instance_id.split(":", 2)
+    if len(parts) != 3:
+        return None
+    if parts[0] != "LMI":
+        return None
+    real_classname = parts[1]
+    if classname and real_classname.lower() != classname.lower():
+        return None
+    return parts[2]