sfa/rspecs/version_manager.py

   1 from __future__ import print_function
   2
   3 import os
   4 from sfa.util.faults import InvalidRSpec, UnsupportedRSpecVersion
   5 from sfa.rspecs.version import RSpecVersion
   6 from sfa.util.sfalogging import logger
   7 from sfa.util.py23 import StringType
   8
   9 class VersionManager:
  10     def __init__(self):
  11         self.versions = []
  12         self.load_versions()
  13
  14     def __repr__(self):
  15         return "<VersionManager with {} flavours: [{}]>"\
  16             .format(len(self.versions),
  17                     ", ".join( [ str(x) for x in self.versions ]))
  18
  19     def load_versions(self):
  20         path = os.path.dirname(os.path.abspath( __file__ ))
  21         versions_path = path + os.sep + 'versions'
  22         versions_module_path = 'sfa.rspecs.versions'
  23         valid_module = lambda x: os.path.isfile(os.sep.join([versions_path, x])) \
  24                         and x.endswith('.py') and x !=  '__init__.py'
  25         files = [f for f in os.listdir(versions_path) if valid_module(f)]
  26         for filename in files:
  27             basename = filename.split('.')[0]
  28             module_path = versions_module_path +'.'+basename
  29             module = __import__(module_path, fromlist=module_path)
  30             for attr_name in dir(module):
  31                 attr = getattr(module, attr_name)
  32                 if hasattr(attr, 'version') and hasattr(attr, 'enabled') and attr.enabled == True:
  33                     self.versions.append(attr())
  34
  35     def _get_version(self, type, version_num=None, content_type=None):
  36         retval = None
  37         for version in self.versions:
  38             if type is None or type.lower() == version.type.lower():
  39                 if version_num is None or str(float(version_num)) == str(float(version.version)):
  40                     if content_type is None or content_type.lower() == version.content_type.lower() \
  41                       or version.content_type == '*':
  42                         retval = version
  43                         ### sounds like we should be glad with the first match, not the last one
  44                         break
  45         if not retval:
  46             raise UnsupportedRSpecVersion("[%s %s %s] is not suported here"% (type, version_num, content_type))
  47         return retval
  48
  49     def get_version(self, version=None):
  50         retval = None
  51         if isinstance(version, dict):
  52             retval =  self._get_version(version.get('type'), version.get('version'), version.get('content_type'))
  53         elif isinstance(version, StringType):
  54             version_parts = version.split(' ')
  55             num_parts = len(version_parts)
  56             type = version_parts[0]
  57             version_num = None
  58             content_type = None
  59             if num_parts > 1:
  60                 version_num = version_parts[1]
  61             if num_parts > 2:
  62                 content_type = version_parts[2]
  63             retval = self._get_version(type, version_num, content_type)
  64         elif isinstance(version, RSpecVersion):
  65             retval = version
  66         elif not version:
  67             retval = self.versions[0]
  68         else:
  69             raise UnsupportedRSpecVersion("No such version: %s "% str(version))
  70
  71         return retval
  72
  73     def get_version_by_schema(self, schema):
  74         retval = None
  75         for version in self.versions:
  76             if schema == version.schema:
  77                 retval = version
  78         if not retval:
  79             raise InvalidRSpec("Unkwnown RSpec schema: %s" % schema)
  80         return retval
  81
  82     def show_by_string(self, string):
  83         try:
  84             print(self.get_version(string))
  85         except Exception as e:
  86             print(e)
  87
  88     def show_by_schema(self, string):
  89         try:
  90             print(self.get_version_by_schema(string))
  91         except Exception as e:
  92             print(e)
  93
  94 if __name__ == '__main__':
  95     manager = VersionManager()
  96     print(manager)
  97     manager.show_by_string('sfa 1')
  98     manager.show_by_string('protogeni 2')
  99     manager.show_by_string('protogeni 2 advertisement')
 100     manager.show_by_schema('http://www.protogeni.net/resources/rspec/2/ad.xsd')
 101     manager.show_by_schema('http://sorch.netmode.ntua.gr/ws/RSpec/ad.xsd')
 102