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, ttl=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
25 self.version = self.version_manager.get_version(version)
26 self.parse_xml(rspec, version)
30 self.create(version, ttl)
32 raise InvalidRSpec("No RSpec or version specified. Must specify a valid rspec string or a valid version")
34 def create(self, version=None, ttl=None):
37 ttl: time to live in minutes, this will determine the expires tag of the RSpec
39 self.version = self.version_manager.get_version(version)
40 self.namespaces = self.version.namespaces
41 self.parse_xml(self.version.template, self.version)
42 now = datetime.utcnow()
43 generated_ts = now.strftime(SFATIME_FORMAT)
46 expires_ts = (now + timedelta(minutes=ttl)).strftime(SFATIME_FORMAT)
47 self.xml.set('expires', expires_ts)
48 self.xml.set('generated', generated_ts)
50 def parse_xml(self, xml, version=None):
51 self.xml.parse_xml(xml)
54 self.version = self.version_manager.get_version_by_schema(self.xml.schema)
56 #raise InvalidRSpec('unknown rspec schema: %s' % schema)
57 # TODO: Should start raising an exception once SFA defines a schema.
58 # for now we just default to sfa
59 self.version = self.version_manager.get_version({'type':'sfa','version': '1'})
60 self.version.xml = self.xml
61 self.namespaces = self.xml.namespaces
63 def load_rspec_elements(self, rspec_elements):
65 for rspec_element in rspec_elements:
66 if isinstance(rspec_element, RSpecElement):
67 self.elements[rspec_element.type] = rspec_element
69 def register_rspec_element(self, element_type, element_name, element_path):
70 if element_type not in RSpecElements:
71 raise InvalidRSpecElement(element_type, extra="no such element type: %s. Must specify a valid RSpecElement" % element_type)
72 self.elements[element_type] = RSpecElement(element_type, element_name, element_path)
74 def get_rspec_element(self, element_type):
75 if element_type not in self.elements:
76 msg = "ElementType %s not registerd for this rspec" % element_type
77 raise InvalidRSpecElement(element_type, extra=msg)
78 return self.elements[element_type]
80 def get(self, element_type, filter=None, depth=0):
81 if filter is None: filter={}
82 elements = self.get_elements(element_type, filter)
83 elements = [self.xml.get_element_attributes(elem, depth=depth) for elem in elements]
86 def get_elements(self, element_type, filter=None):
88 search for a registered element
90 if filter is None: filter={}
91 if element_type not in self.elements:
92 msg = "Unable to search for element %s in rspec, expath expression not found." % \
94 raise InvalidRSpecElement(element_type, extra=msg)
95 rspec_element = self.get_rspec_element(element_type)
96 xpath = rspec_element.path + XpathFilter.xpath(filter)
97 return self.xml.xpath(xpath)
99 def merge(self, in_rspec):
100 self.version.merge(in_rspec)
102 def filter(self, filter):
103 if 'component_manager_id' in filter:
104 nodes = self.version.get_nodes()
106 if 'component_manager_id' not in node.attrib or \
107 node.attrib['component_manager_id'] != filter['component_manager_id']:
108 parent = node.getparent()
109 parent.remove(node.element)
112 def toxml(self, header=True):
114 return self.header + self.xml.toxml()
116 return self.xml.toxml()
119 def save(self, filename):
120 return self.xml.save(filename)
122 if __name__ == '__main__':
123 rspec = RSpec('/tmp/resources.rspec')
125 rspec.register_rspec_element(RSpecElements.NETWORK, 'network', '//network')
126 rspec.register_rspec_element(RSpecElements.NODE, 'node', '//node')
127 print rspec.get(RSpecElements.NODE)[0]
128 print rspec.get(RSpecElements.NODE, depth=1)[0]