2 from datetime import datetime, timedelta
4 from sfa.util.xml import XML, XpathFilter
5 from sfa.util.faults import InvalidRSpecElement, InvalidRSpec
7 from sfa.rspecs.rspec_elements import RSpecElement, RSpecElements
8 from sfa.rspecs.version_manager import VersionManager
12 def __init__(self, rspec="", version=None, user_options={}, ttl=60):
13 self.header = '<?xml version="1.0"?>\n'
14 self.template = """<RSpec></RSpec>"""
17 self.version_manager = VersionManager()
18 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, ttl=60):
35 ttl: time to live in minutes, this will determine the expires tag of the RSpec
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 # eg. 2011-03-23T19:53:28Z
41 date_format = '%Y-%m-%dT%H:%M:%SZ'
42 now = datetime.utcnow()
43 generated_ts = now.strftime(date_format)
44 expires_ts = (now + timedelta(minutes=self.ttl)).strftime(date_format)
45 self.xml.set('expires', expires_ts)
46 self.xml.set('generated', generated_ts)
48 def parse_xml(self, xml, version=None):
49 self.xml.parse_xml(xml)
52 self.version = self.version_manager.get_version_by_schema(self.xml.schema)
54 #raise InvalidRSpec('unknown rspec schema: %s' % schema)
55 # TODO: Should start raising an exception once SFA defines a schema.
56 # for now we just default to sfa
57 self.version = self.version_manager.get_version({'type':'sfa','version': '1'})
58 self.version.xml = self.xml
59 self.namespaces = self.xml.namespaces
61 def load_rspec_elements(self, rspec_elements):
63 for rspec_element in rspec_elements:
64 if isinstance(rspec_element, RSpecElement):
65 self.elements[rspec_element.type] = rspec_element
67 def register_rspec_element(self, element_type, element_name, element_path):
68 if element_type not in RSpecElements:
69 raise InvalidRSpecElement(element_type, extra="no such element type: %s. Must specify a valid RSpecElement" % element_type)
70 self.elements[element_type] = RSpecElement(element_type, element_name, element_path)
72 def get_rspec_element(self, element_type):
73 if element_type not in self.elements:
74 msg = "ElementType %s not registerd for this rspec" % element_type
75 raise InvalidRSpecElement(element_type, extra=msg)
76 return self.elements[element_type]
78 def get(self, element_type, filter={}, depth=0):
79 elements = self.get_elements(element_type, filter)
80 elements = [self.xml.get_element_attributes(elem, depth=depth) for elem in elements]
83 def get_elements(self, element_type, filter={}):
85 search for a registered element
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]