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, expires=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
22 self.expires = expires
26 self.version = self.version_manager.get_version(version)
27 self.parse_xml(rspec, version)
31 self.create(version, ttl, expires)
33 raise InvalidRSpec("No RSpec or version specified. Must specify a valid rspec string or a valid version")
35 def create(self, version=None, ttl=None, expires=None):
38 ttl: time to live in minutes, this will determine the expires tag of the RSpec
40 self.version = self.version_manager.get_version(version)
41 self.namespaces = self.version.namespaces
42 self.parse_xml(self.version.template, self.version)
43 now = datetime.utcnow()
44 generated_ts = now.strftime(SFATIME_FORMAT)
48 expires_ts = (now + timedelta(minutes=ttl)).strftime(SFATIME_FORMAT)
50 if isinstance(expires,int):
51 expires_date = datetime.fromtimestamp(expires)
53 expires_date = expires
54 expires_ts = expires_date.strftime(SFATIME_FORMAT)
55 self.xml.set('expires', expires_ts)
56 self.xml.set('generated', generated_ts)
58 def parse_xml(self, xml, version=None):
59 self.xml.parse_xml(xml)
62 self.version = self.version_manager.get_version_by_schema(self.xml.schema)
64 #raise InvalidRSpec('unknown rspec schema: %s' % schema)
65 # TODO: Should start raising an exception once SFA defines a schema.
66 # for now we just default to sfa
67 self.version = self.version_manager.get_version({'type':'sfa','version': '1'})
68 self.version.xml = self.xml
69 self.namespaces = self.xml.namespaces
71 def load_rspec_elements(self, rspec_elements):
73 for rspec_element in rspec_elements:
74 if isinstance(rspec_element, RSpecElement):
75 self.elements[rspec_element.type] = rspec_element
77 def register_rspec_element(self, element_type, element_name, element_path):
78 if element_type not in RSpecElements:
79 raise InvalidRSpecElement(element_type, extra="no such element type: %s. Must specify a valid RSpecElement" % element_type)
80 self.elements[element_type] = RSpecElement(element_type, element_name, element_path)
82 def get_rspec_element(self, element_type):
83 if element_type not in self.elements:
84 msg = "ElementType %s not registerd for this rspec" % element_type
85 raise InvalidRSpecElement(element_type, extra=msg)
86 return self.elements[element_type]
88 def get(self, element_type, filter=None, depth=0):
89 if filter is None: filter={}
90 elements = self.get_elements(element_type, filter)
91 elements = [self.xml.get_element_attributes(elem, depth=depth) for elem in elements]
94 def get_elements(self, element_type, filter=None):
96 search for a registered element
98 if filter is None: filter={}
99 if element_type not in self.elements:
100 msg = "Unable to search for element %s in rspec, expath expression not found." % \
102 raise InvalidRSpecElement(element_type, extra=msg)
103 rspec_element = self.get_rspec_element(element_type)
104 xpath = rspec_element.path + XpathFilter.xpath(filter)
105 return self.xml.xpath(xpath)
107 def merge(self, in_rspec):
108 self.version.merge(in_rspec)
110 def filter(self, filter):
111 if 'component_manager_id' in filter:
112 nodes = self.version.get_nodes()
114 if 'component_manager_id' not in node.attrib or \
115 node.attrib['component_manager_id'] != filter['component_manager_id']:
116 parent = node.getparent()
117 parent.remove(node.element)
120 def toxml(self, header=True):
122 return self.header + self.xml.toxml()
124 return self.xml.toxml()
127 def save(self, filename):
128 return self.xml.save(filename)
130 if __name__ == '__main__':
131 rspec = RSpec('/tmp/resources.rspec')
133 rspec.register_rspec_element(RSpecElements.NETWORK, 'network', '//network')
134 rspec.register_rspec_element(RSpecElements.NODE, 'node', '//node')
135 print rspec.get(RSpecElements.NODE)[0]
136 print rspec.get(RSpecElements.NODE, depth=1)[0]