3 from StringIO import StringIO
4 from datetime import datetime, timedelta
5 from sfa.util.xrn import *
6 from sfa.util.plxrn import hostname_to_urn
7 from sfa.rspecs.rspec_elements import RSpecElement, RSpecElements
8 from sfa.util.faults import SfaNotImplemented, InvalidRSpec, InvalidRSpecElement
17 for (key, value) in filter.items():
22 if isinstance(value, str):
23 filter_list.append('%s="%s"' % (key, value))
24 elif isinstance(value, list):
25 filter_list.append('contains("%s", %s)' % (' '.join(map(str, value)), key))
27 xpath = ' and '.join(filter_list)
28 xpath = '[' + xpath + ']'
32 header = '<?xml version="1.0"?>\n'
33 template = """<RSpec></RSpec>"""
40 def __init__(self, rspec="", namespaces={}, type=None, user_options={}):
42 self.user_options = user_options
45 self.parse_rspec(rspec, namespaces)
53 # eg. 2011-03-23T19:53:28Z
54 date_format = '%Y-%m-%dT%H:%M:%SZ'
55 now = datetime.utcnow()
56 generated_ts = now.strftime(date_format)
57 expires_ts = (now + timedelta(hours=1)).strftime(date_format)
58 self.parse_rspec(self.template, self.namespaces)
59 self.xml.set('expires', expires_ts)
60 self.xml.set('generated', generated_ts)
62 def parse_rspec(self, rspec, namespaces={}):
64 parse rspec into etree
66 parser = etree.XMLParser(remove_blank_text=True)
68 tree = etree.parse(rspec, parser)
70 # 'rspec' file doesnt exist. 'rspec' is proably an xml string
72 tree = etree.parse(StringIO(rspec), parser)
74 raise InvalidRSpec(str(e))
75 self.xml = tree.getroot()
77 self.namespaces = namespaces
79 def validate(self, schema):
81 Validate against rng schema
84 relaxng_doc = etree.parse(schema)
85 relaxng = etree.RelaxNG(relaxng_doc)
86 if not relaxng(self.xml):
87 error = relaxng.error_log.last_error
88 message = "%s (line %s)" % (error.message, error.line)
89 raise InvalidRSpec(message)
92 def xpath(self, xpath):
93 return self.xml.xpath(xpath, namespaces=self.namespaces)
95 def register_element_type(self, element_type, element_name, element_path):
96 if element_type not in RSpecElements:
97 raise InvalidRSpecElement(element_type, extra="no such element type: %s. Must specify a valid RSpecElement" % element_type)
98 self.elements[element_type] = RSpecElement(element_type, element_name, element_path)
100 def get_element_type(self, element_type):
101 if element_type not in self.elements:
102 msg = "ElementType %s not registerd for this rspec" % element_type
103 raise InvalidRSpecElement(element_type, extra=msg)
104 return self.elements[element_type]
106 def add_attribute(self, elem, name, value):
108 Add attribute to specified etree element
110 opt = etree.SubElement(elem, name)
113 def add_element(self, name, attrs={}, parent=None, text=""):
115 Generic wrapper around etree.SubElement(). Adds an element to
116 specified parent node. Adds element to root node is parent is
121 element = etree.SubElement(parent, name)
124 if isinstance(attrs, dict):
126 element.set(attr, attrs[attr])
129 def remove_attribute(self, elem, name, value):
131 Removes an attribute from an element
134 opts = elem.iterfind(name)
137 if opt.text == value:
140 def remove_element(self, element_name, root_node = None):
142 Removes all occurences of an element from the tree. Start at
143 specified root_node if specified, otherwise start at tree's root.
148 if not element_name.startswith('//'):
149 element_name = '//' + element_name
151 elements = root_node.xpath('%s ' % element_name, namespaces=self.namespaces)
152 for element in elements:
153 parent = element.getparent()
154 parent.remove(element)
156 def attributes_list(self, elem):
157 # convert a list of attribute tags into list of tuples
158 # (tagnme, text_value)
162 opts.append((e.tag, str(e.text).strip()))
165 def get_element_attributes(self, elem=None, depth=0):
167 elem = self.root_node
168 attrs = dict(elem.attrib)
169 attrs['text'] = str(elem.text).strip()
170 if isinstance(depth, int) and depth > 0:
171 for child_elem in list(elem):
172 key = str(child_elem.tag)
174 attrs[key] = [self.get_element_attributes(child_elem, depth-1)]
176 attrs[key].append(self.get_element_attributes(child_elem, depth-1))
178 attrs['child_nodes'] = list(elem)
181 def get(self, element_type, filter={}, depth=0):
182 elements = [self.get_element_attributes(element, depth=depth) for element in \
183 self.get_elements(element_type, filter)]
186 def get_elements(self, element_type, filter={}):
188 search for a registered element
190 if element_type not in self.elements:
191 msg = "Unable to search for element %s in rspec, expath expression not found." % \
193 raise InvalidRSpecElement(element_type, extra=msg)
194 rspec_element = self.get_element_type(element_type)
195 xpath = rspec_element.path + XpathFilter.xpath(filter)
196 return self.xpath(xpath)
198 def merge(self, in_rspec):
203 Optional method which inheriting classes can choose to implent.
207 def _process_slivers(self, slivers):
209 Creates a dict of sliver details for each sliver host
211 @param slivers a single hostname, list of hostanmes or list of dicts keys on hostname,
212 Returns a list of dicts
214 if not isinstance(slivers, list):
217 for sliver in slivers:
218 if isinstance(sliver, dict):
220 elif isinstance(sliver, basestring):
221 dicts.append({'hostname': sliver})
227 def toxml(self, cleanup=False):
230 return self.header + etree.tostring(self.xml, pretty_print=True)
232 def save(self, filename):
233 f = open(filename, 'w')
234 f.write(self.toxml())
237 if __name__ == '__main__':
238 rspec = RSpec('/tmp/resources.rspec')
240 #rspec.register_element_type(RSpecElements.NETWORK, 'network', '//network')
241 #rspec.register_element_type(RSpecElements.NODE, 'node', '//node')
242 #print rspec.find(RSpecElements.NODE)[0]
243 #print rspec.find(RSpecElements.NODE, depth=1)[0]