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={}):
14 self.header = '<?xml version="1.0"?>\n'
15 self.template = """<RSpec></RSpec>"""
18 self.version_manager = VersionManager()
19 self.user_options = user_options
23 self.version = self.version_manager.get_version(version)
24 self.parse_xml(rspec, version)
30 raise InvalidRSpec("No RSpec or version specified. Must specify a valid rspec string or a valid version")
32 def create(self, version=None):
36 self.version = self.version_manager.get_version(version)
37 self.namespaces = self.version.namespaces
38 self.parse_xml(self.version.template, self.version)
39 now = datetime.utcnow()
40 generated_ts = now.strftime(SFATIME_FORMAT)
41 expires_ts = (now + timedelta(hours=1)).strftime(SFATIME_FORMAT)
42 self.xml.set('expires', expires_ts)
43 self.xml.set('generated', generated_ts)
45 def parse_xml(self, xml, version=None):
46 self.xml.parse_xml(xml)
49 self.version = self.version_manager.get_version_by_schema(self.xml.schema)
51 #raise InvalidRSpec('unknown rspec schema: %s' % schema)
52 # TODO: Should start raising an exception once SFA defines a schema.
53 # for now we just default to sfa
54 self.version = self.version_manager.get_version({'type':'sfa','version': '1'})
55 self.version.xml = self.xml
56 self.namespaces = self.xml.namespaces
58 def load_rspec_elements(self, rspec_elements):
60 for rspec_element in rspec_elements:
61 if isinstance(rspec_element, RSpecElement):
62 self.elements[rspec_element.type] = rspec_element
64 def register_rspec_element(self, element_type, element_name, element_path):
65 if element_type not in RSpecElements:
66 raise InvalidRSpecElement(element_type, extra="no such element type: %s. Must specify a valid RSpecElement" % element_type)
67 self.elements[element_type] = RSpecElement(element_type, element_name, element_path)
69 def get_rspec_element(self, element_type):
70 if element_type not in self.elements:
71 msg = "ElementType %s not registerd for this rspec" % element_type
72 raise InvalidRSpecElement(element_type, extra=msg)
73 return self.elements[element_type]
75 def get(self, element_type, filter={}, depth=0):
76 elements = self.get_elements(element_type, filter)
77 elements = [self.xml.get_element_attributes(elem, depth=depth) for elem in elements]
80 def get_elements(self, element_type, filter={}):
82 search for a registered element
84 if element_type not in self.elements:
85 msg = "Unable to search for element %s in rspec, expath expression not found." % \
87 raise InvalidRSpecElement(element_type, extra=msg)
88 rspec_element = self.get_rspec_element(element_type)
89 xpath = rspec_element.path + XpathFilter.xpath(filter)
90 return self.xml.xpath(xpath)
92 def merge(self, in_rspec):
93 self.version.merge(in_rspec)
95 def filter(self, filter):
96 if 'component_manager_id' in filter:
97 nodes = self.version.get_nodes()
99 if 'component_manager_id' not in node.attrib or \
100 node.attrib['component_manager_id'] != filter['component_manager_id']:
101 parent = node.getparent()
102 parent.remove(node.element)
105 def toxml(self, header=True):
107 return self.header + self.xml.toxml()
109 return self.xml.toxml()
112 def save(self, filename):
113 return self.xml.save(filename)
115 if __name__ == '__main__':
116 rspec = RSpec('/tmp/resources.rspec')
118 rspec.register_rspec_element(RSpecElements.NETWORK, 'network', '//network')
119 rspec.register_rspec_element(RSpecElements.NODE, 'node', '//node')
120 print rspec.get(RSpecElements.NODE)[0]
121 print rspec.get(RSpecElements.NODE, depth=1)[0]