2 # -*- coding: utf-8 -*-
4 from constants import TESTBED_ID
13 # Map Node attribute to plcapi filter name
14 'hostname' : 'hostname',
18 # Map Node attribute to (<tag name>, <plcapi filter expression>)
19 # There are replacements that are applied with string formatting,
20 # so '%' has to be escaped as '%%'.
21 'architecture' : ('arch','value'),
22 'operating_system' : ('fcdistro','value'),
23 'pl_distro' : ('pldistro','value'),
24 'min_reliability' : ('reliability%(timeframe)s', ']value'),
25 'max_reliability' : ('reliability%(timeframe)s', '[value'),
26 'min_bandwidth' : ('bw%(timeframe)s', ']value'),
27 'max_bandwidth' : ('bw%(timeframe)s', '[value'),
30 def __init__(self, api=None):
37 self.architecture = None
38 self.operating_system = None
42 self.min_reliability = None
43 self.max_reliability = None
44 self.min_bandwidth = None
45 self.max_bandwidth = None
46 self.min_num_external_ifaces = None
47 self.max_num_external_ifaces = None
50 # Applications add requirements to connected nodes
51 self.required_packages = set()
53 # Testbed-derived attributes
55 self.ident_path = None
58 # Those are filled when an actual node is allocated
61 def build_filters(self, target_filters, filter_map):
62 for attr, tag in filter_map.iteritems():
63 value = getattr(self, attr, None)
65 target_filters[tag] = value
69 def applicable_filters(self):
70 has = lambda att : getattr(self,att,None) is not None
72 filter(has, self.BASEFILTERS.iterkeys())
73 + filter(has, self.TAGFILTERS.iterkeys())
76 def find_candidates(self, filter_slice_id=None):
78 replacements = {'timeframe':self.timeframe}
80 # get initial candidates (no tag filters)
81 basefilters = self.build_filters({}, self.BASEFILTERS)
83 basefilters['|slice_ids'] = (filter_slice_id,)
85 # keyword-only "pseudofilters"
88 extra['peer'] = self.site
90 candidates = set(map(operator.itemgetter('node_id'),
91 self._api.GetNodes(filters=basefilters, fields=fields, **extra)))
93 # filter by tag, one tag at a time
94 applicable = self.applicable_filters
95 for tagfilter in self.TAGFILTERS.iteritems():
96 attr, (tagname, expr) = tagfilter
98 # don't bother if there's no filter defined
99 if attr in applicable:
100 tagfilter = basefilters.copy()
101 tagfilter['tagname'] = tagname % replacements
102 tagfilter[expr % replacements] = getattr(self,attr)
103 tagfilter['node_id'] = list(candidates)
105 candidates &= set(map(operator.itemgetter('node_id'),
106 self._api.GetNodeTags(filters=tagfilter, fields=fields)))
108 # filter by iface count
109 if self.min_num_external_ifaces is not None or self.max_num_external_ifaces is not None:
110 # fetch interfaces for all, in one go
111 filters = basefilters.copy()
112 filters['node_id'] = list(candidates)
113 ifaces = dict(map(operator.itemgetter('node_id','interface_ids'),
114 self._api.GetNodes(filters=basefilters, fields=('node_id','interface_ids')) ))
116 # filter candidates by interface count
117 if self.min_num_external_ifaces is not None and self.max_num_external_ifaces is not None:
118 predicate = ( lambda node_id :
119 self.min_num_external_ifaces <= len(ifaces.get(node_id,())) <= self.max_num_external_ifaces )
120 elif self.min_num_external_ifaces is not None:
121 predicate = ( lambda node_id :
122 self.min_num_external_ifaces <= len(ifaces.get(node_id,())) )
124 predicate = ( lambda node_id :
125 len(ifaces.get(node_id,())) <= self.max_num_external_ifaces )
127 candidates = set(filter(predicate, candidates))
131 def assign_node_id(self, node_id):
132 self._node_id = node_id
133 self.fetch_node_info()
135 def fetch_node_info(self):
136 info = self._api.GetNodes(self._node_id)
137 tags = dict( (t['tagname'],t['value'])
138 for t in self._api.GetNodeTags(node_id=self._node_id, fields=('tagname','value')) )
140 self.min_num_external_ifaces = None
141 self.max_num_external_ifaces = None
144 replacements = {'timeframe':self.timeframe}
145 for attr, tag in self.BASEFILTERS.iteritems():
148 setattr(self, attr, value)
149 for attr, (tag,_) in self.TAGFILTERS.iteritems():
150 tag = tag % replacements
153 setattr(self, attr, value)
155 if 'peer_id' in info:
156 self.site = self._api.peer_map[info['peer_id']]
158 if 'interface_ids' in info:
159 self.min_num_external_ifaces = \
160 self.max_num_external_ifaces = len(info['interface_ids'])
163 if self.home_path is None:
164 raise AssertionError, "Misconfigured node: missing home path"
165 if self.ident_path is None or not os.access(self.ident_path, os.R_OK):
166 raise AssertionError, "Misconfigured node: missing slice SSH key"
167 if self.slicename is None:
168 raise AssertionError, "Misconfigured node: unspecified slice"
170 def install_dependencies(self):
171 if self.required_packages:
172 # TODO: make dependant on the experiment somehow...
173 pidfile = '/tmp/nepi-depends.pid'
174 logfile = '/tmp/nepi-depends.log'
176 # Start process in a "daemonized" way, using nohup and heavy
177 # stdin/out redirection to avoid connection issues
178 (out,err),proc = rspawn.remote_spawn(
179 "yum -y install %(packages)s" % {
180 'packages' : ' '.join(self.required_packages),
184 stderr = rspawn.STDOUT,
186 host = self.hostname,
188 user = self.slicename,
190 ident_key = self.ident_path,
195 raise RuntimeError, "Failed to set up application: %s %s" % (out,err,)
197 def wait_dependencies(self, pidprobe=1, probe=10, pidmax=10):
198 if self.required_packages:
201 for probenum in xrange(pidmax):
202 pidtuple = rspawn.remote_check_pid(
204 host = self.hostname,
206 user = self.slicename,
208 ident_key = self.ident_path
216 raise RuntimeError, "Failed to obtain pidfile for dependency installer"
218 # wait for it to finish
219 while rspawn.RUNNING is rspawn.remote_status(
221 host = self.hostname,
223 user = self.slicename,
225 ident_key = self.ident_path