1 files changed, 72 insertions, 0 deletions
diff --git a/charms/trusty/cassandra/hooks/charmhelpers/core/strutils.py b/charms/trusty/cassandra/hooks/charmhelpers/core/strutils.py
new file mode 100644
index 0000000..7e3f969
--- /dev/null
+++ b/charms/trusty/cassandra/hooks/charmhelpers/core/strutils.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# Copyright 2014-2015 Canonical Limited.
+#
+# This file is part of charm-helpers.
+#
+# charm-helpers is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# charm-helpers is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with charm-helpers.  If not, see <http://www.gnu.org/licenses/>.
+
+import six
+import re
+
+
+def bool_from_string(value):
+    """Interpret string value as boolean.
+
+    Returns True if value translates to True otherwise False.
+    """
+    if isinstance(value, six.string_types):
+        value = six.text_type(value)
+    else:
+        msg = "Unable to interpret non-string value '%s' as boolean" % (value)
+        raise ValueError(msg)
+
+    value = value.strip().lower()
+
+    if value in ['y', 'yes', 'true', 't', 'on']:
+        return True
+    elif value in ['n', 'no', 'false', 'f', 'off']:
+        return False
+
+    msg = "Unable to interpret string value '%s' as boolean" % (value)
+    raise ValueError(msg)
+
+
+def bytes_from_string(value):
+    """Interpret human readable string value as bytes.
+
+    Returns int
+    """
+    BYTE_POWER = {
+        'K': 1,
+        'KB': 1,
+        'M': 2,
+        'MB': 2,
+        'G': 3,
+        'GB': 3,
+        'T': 4,
+        'TB': 4,
+        'P': 5,
+        'PB': 5,
+    }
+    if isinstance(value, six.string_types):
+        value = six.text_type(value)
+    else:
+        msg = "Unable to interpret non-string value '%s' as boolean" % (value)
+        raise ValueError(msg)
+    matches = re.match("([0-9]+)([a-zA-Z]+)", value)
+    if not matches:
+        msg = "Unable to interpret string value '%s' as bytes" % (value)
+        raise ValueError(msg)
+    return int(matches.group(1)) * (1024 ** BYTE_POWER[matches.group(2)])