sfa/rspecs/version_manager.py

   1 import os
   2 from sfa.util.faults import InvalidRSpec, UnsupportedRSpecVersion
   3 from sfa.rspecs.version import RSpecVersion
   4 from sfa.util.sfalogging import logger
   5
   6 class VersionManager:
   7     def __init__(self):
   8         self.versions = []
   9         self.load_versions()
  10
  11     def load_versions(self):
  12         path = os.path.dirname(os.path.abspath( __file__ ))
  13         versions_path = path + os.sep + 'versions'
  14         versions_module_path = 'sfa.rspecs.versions'
  15         valid_module = lambda x: os.path.isfile(os.sep.join([versions_path, x])) \
  16                         and x.endswith('.py') and x !=  '__init__.py'
  17         files = [f for f in os.listdir(versions_path) if valid_module(f)]
  18         for filename in files:
  19             basename = filename.split('.')[0]
  20             module_path = versions_module_path +'.'+basename
  21             module = __import__(module_path, fromlist=module_path)
  22             for attr_name in dir(module):
  23                 attr = getattr(module, attr_name)
  24                 if hasattr(attr, 'version') and hasattr(attr, 'enabled') and attr.enabled == True:
  25                     self.versions.append(attr())
  26
  27     def _get_version(self, type, version_num=None, content_type=None):
  28         retval = None
  29         for version in self.versions:
  30             if type is None or type.lower() == version.type.lower():
  31                 if version_num is None or str(float(version_num)) == str(float(version.version)):
  32                     if content_type is None or content_type.lower() == version.content_type.lower() \
  33                       or version.content_type == '*':
  34                         retval = version
  35                         ### sounds like we should be glad with the first match, not the last one
  36                         break
  37         if not retval:
  38             raise UnsupportedRSpecVersion("[%s %s %s] is not suported here"% (type, version_num, content_type))
  39         return retval
  40
  41     def get_version(self, version=None):
  42         retval = None
  43         if isinstance(version, dict):
  44             retval =  self._get_version(version.get('type'), version.get('version'), version.get('content_type'))
  45         elif isinstance(version, basestring):
  46             version_parts = version.split(' ')
  47             num_parts = len(version_parts)
  48             type = version_parts[0]
  49             version_num = None
  50             content_type = None
  51             if num_parts > 1:
  52                 version_num = version_parts[1]
  53             if num_parts > 2:
  54                 content_type = version_parts[2]
  55             retval = self._get_version(type, version_num, content_type)
  56         elif isinstance(version, RSpecVersion):
  57             retval = version
  58         elif not version:
  59             retval = self.versions[0]
  60         else:
  61             raise UnsupportedRSpecVersion("No such version: %s "% str(version))
  62
  63         return retval
  64
  65     def get_version_by_schema(self, schema):
  66         retval = None
  67         for version in self.versions:
  68             if schema == version.schema:
  69                 retval = version
  70         if not retval:
  71             raise InvalidRSpec("Unkwnown RSpec schema: %s" % schema)
  72         return retval
  73
  74 def show_by_string(string):
  75     try:
  76         print v.get_version(string)
  77     except Exception,e:
  78         print e
  79 def show_by_schema(string):
  80     try:
  81         print v.get_version_by_schema(string)
  82     except Exception,e:
  83         print e
  84
  85 if __name__ == '__main__':
  86     v = VersionManager()
  87     print v.versions
  88     show_by_string('sfa 1')
  89     show_by_string('protogeni 2')
  90     show_by_string('protogeni 2 advertisement')
  91     show_by_schema('http://www.protogeni.net/resources/rspec/2/ad.xsd')
  92     show_by_schema('http://sorch.netmode.ntua.gr/ws/RSpec/ad.xsd')
  93