2 from datetime import datetime, timedelta
4 from sfa.util.xml import XML, XpathFilter
5 from sfa.util.faults import InvalidRSpecElement, InvalidRSpec
6 from sfa.util.sfatime import SFATIME_FORMAT
8 from sfa.rspecs.rspec_elements import RSpecElement, RSpecElements
9 from sfa.rspecs.version_manager import VersionManager
13 def __init__(self, rspec="", version=None, user_options=None):
14 if user_options is None: user_options={}
15 self.header = '<?xml version="1.0"?>\n'
16 self.template = """<RSpec></RSpec>"""
19 self.version_manager = VersionManager()
20 self.user_options = user_options
24 self.version = self.version_manager.get_version(version)
25 self.parse_xml(rspec, version)
31 raise InvalidRSpec("No RSpec or version specified. Must specify a valid rspec string or a valid version")
33 def create(self, version=None):
37 self.version = self.version_manager.get_version(version)
38 self.namespaces = self.version.namespaces
39 self.parse_xml(self.version.template, self.version)
40 now = datetime.utcnow()
41 generated_ts = now.strftime(SFATIME_FORMAT)
42 expires_ts = (now + timedelta(hours=1)).strftime(SFATIME_FORMAT)
43 self.xml.set('expires', expires_ts)
44 self.xml.set('generated', generated_ts)
46 def parse_xml(self, xml, version=None):
47 self.xml.parse_xml(xml)
50 self.version = self.version_manager.get_version_by_schema(self.xml.schema)
52 #raise InvalidRSpec('unknown rspec schema: %s' % schema)
53 # TODO: Should start raising an exception once SFA defines a schema.
54 # for now we just default to sfa
55 self.version = self.version_manager.get_version({'type':'sfa','version': '1'})
56 self.version.xml = self.xml
57 self.namespaces = self.xml.namespaces
59 def load_rspec_elements(self, rspec_elements):
61 for rspec_element in rspec_elements:
62 if isinstance(rspec_element, RSpecElement):
63 self.elements[rspec_element.type] = rspec_element
65 def register_rspec_element(self, element_type, element_name, element_path):
66 if element_type not in RSpecElements:
67 raise InvalidRSpecElement(element_type, extra="no such element type: %s. Must specify a valid RSpecElement" % element_type)
68 self.elements[element_type] = RSpecElement(element_type, element_name, element_path)
70 def get_rspec_element(self, element_type):
71 if element_type not in self.elements:
72 msg = "ElementType %s not registerd for this rspec" % element_type
73 raise InvalidRSpecElement(element_type, extra=msg)
74 return self.elements[element_type]
76 def get(self, element_type, filter=None, depth=0):
77 if filter is None: filter={}
78 elements = self.get_elements(element_type, filter)
79 elements = [self.xml.get_element_attributes(elem, depth=depth) for elem in elements]
82 def get_elements(self, element_type, filter=None):
84 search for a registered element
86 if filter is None: filter={}
87 if element_type not in self.elements:
88 msg = "Unable to search for element %s in rspec, expath expression not found." % \
90 raise InvalidRSpecElement(element_type, extra=msg)
91 rspec_element = self.get_rspec_element(element_type)
92 xpath = rspec_element.path + XpathFilter.xpath(filter)
93 return self.xml.xpath(xpath)
95 def merge(self, in_rspec):
96 self.version.merge(in_rspec)
98 def filter(self, filter):
99 if 'component_manager_id' in filter:
100 nodes = self.version.get_nodes()
102 if 'component_manager_id' not in node.attrib or \
103 node.attrib['component_manager_id'] != filter['component_manager_id']:
104 parent = node.getparent()
105 parent.remove(node.element)
108 def toxml(self, header=True):
110 return self.header + self.xml.toxml()
112 return self.xml.toxml()
115 def save(self, filename):
116 return self.xml.save(filename)
118 if __name__ == '__main__':
119 rspec = RSpec('/tmp/resources.rspec')
121 rspec.register_rspec_element(RSpecElements.NETWORK, 'network', '//network')
122 rspec.register_rspec_element(RSpecElements.NODE, 'node', '//node')
123 print rspec.get(RSpecElements.NODE)[0]
124 print rspec.get(RSpecElements.NODE, depth=1)[0]