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- #!/usr/bin/env python
- # vim: expandtab:tabstop=4:shiftwidth=4
- ''' The purpose of this module is to contain small utility functions.
- '''
- import re
- def normalize_dnsname(name, padding=10):
- ''' The purpose of this function is to return a dns name with zero padding,
- so that it sorts properly (as a human would expect).
- Example: name=ex-lrg-node10.prod.rhcloud.com
- Returns: ex-lrg-node0000000010.prod.rhcloud.com
- Example Usage:
- sorted(['a3.example.com', 'a10.example.com', 'a1.example.com'],
- key=normalize_dnsname)
- Returns: ['a1.example.com', 'a3.example.com', 'a10.example.com']
- '''
- parts = re.split(r'(\d+)', name)
- retval = []
- for part in parts:
- if re.match(r'^\d+$', part):
- retval.append(part.zfill(padding))
- else:
- retval.append(part)
- return ''.join(retval)
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