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