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-rw-r--r--charms/trusty/cassandra/hooks/charmhelpers/core/strutils.py72
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)])