2 # -*- coding: utf-8 -*-
4 from constants import TESTBED_ID
13 from nepi.util import server
17 # Map Node attribute to plcapi filter name
18 'hostname' : 'hostname',
22 # Map Node attribute to (<tag name>, <plcapi filter expression>)
23 # There are replacements that are applied with string formatting,
24 # so '%' has to be escaped as '%%'.
25 'architecture' : ('arch','value'),
26 'operating_system' : ('fcdistro','value'),
27 'pl_distro' : ('pldistro','value'),
28 'min_reliability' : ('reliability%(timeframe)s', ']value'),
29 'max_reliability' : ('reliability%(timeframe)s', '[value'),
30 'min_bandwidth' : ('bw%(timeframe)s', ']value'),
31 'max_bandwidth' : ('bw%(timeframe)s', '[value'),
34 DEPENDS_PIDFILE = '/tmp/nepi-depends.pid'
35 DEPENDS_LOGFILE = '/tmp/nepi-depends.log'
37 def __init__(self, api=None):
44 self.architecture = None
45 self.operating_system = None
49 self.min_reliability = None
50 self.max_reliability = None
51 self.min_bandwidth = None
52 self.max_bandwidth = None
53 self.min_num_external_ifaces = None
54 self.max_num_external_ifaces = None
57 # Applications and routes add requirements to connected nodes
58 self.required_packages = set()
59 self.required_vsys = set()
61 self.env = collections.defaultdict(list)
63 # Testbed-derived attributes
65 self.ident_path = None
66 self.server_key = None
69 # Those are filled when an actual node is allocated
73 def _nepi_testbed_environment_setup(self):
74 command = cStringIO.StringIO()
75 command.write('PYTHONPATH=$PYTHONPATH:%s' % (
76 ':'.join(["${HOME}/"+server.shell_escape(s) for s in self.pythonpath])
78 command.write(' PATH=$PATH:%s' % (
79 ':'.join(["${HOME}/"+server.shell_escape(s) for s in self.pythonpath])
82 for envkey, envvals in self.node.env.iteritems():
83 for envval in envvals:
84 command.write(' %s=%s' % (envkey, envval))
85 command.write(self.command)
86 return command.getvalue()
88 def build_filters(self, target_filters, filter_map):
89 for attr, tag in filter_map.iteritems():
90 value = getattr(self, attr, None)
92 target_filters[tag] = value
96 def applicable_filters(self):
97 has = lambda att : getattr(self,att,None) is not None
99 filter(has, self.BASEFILTERS.iterkeys())
100 + filter(has, self.TAGFILTERS.iterkeys())
103 def find_candidates(self, filter_slice_id=None):
104 fields = ('node_id',)
105 replacements = {'timeframe':self.timeframe}
107 # get initial candidates (no tag filters)
108 basefilters = self.build_filters({}, self.BASEFILTERS)
110 basefilters['|slice_ids'] = (filter_slice_id,)
112 # keyword-only "pseudofilters"
115 extra['peer'] = self.site
117 candidates = set(map(operator.itemgetter('node_id'),
118 self._api.GetNodes(filters=basefilters, fields=fields, **extra)))
120 # filter by tag, one tag at a time
121 applicable = self.applicable_filters
122 for tagfilter in self.TAGFILTERS.iteritems():
123 attr, (tagname, expr) = tagfilter
125 # don't bother if there's no filter defined
126 if attr in applicable:
127 tagfilter = basefilters.copy()
128 tagfilter['tagname'] = tagname % replacements
129 tagfilter[expr % replacements] = getattr(self,attr)
130 tagfilter['node_id'] = list(candidates)
132 candidates &= set(map(operator.itemgetter('node_id'),
133 self._api.GetNodeTags(filters=tagfilter, fields=fields)))
135 # filter by vsys tags - special case since it doesn't follow
136 # the usual semantics
137 if self.required_vsys:
138 newcandidates = collections.defaultdict(set)
140 vsys_tags = self._api.GetNodeTags(
142 node_id = list(candidates),
143 fields = ['node_id','value'])
146 operator.itemgetter(['node_id','value']),
149 required_vsys = self.required_vsys
150 for node_id, value in vsys_tags:
151 if value in required_vsys:
152 newcandidates[value].add(node_id)
154 # take only those that have all the required vsys tags
155 newcandidates = reduce(
156 lambda accum, new : accum & new,
157 newcandidates.itervalues(),
160 # filter by iface count
161 if self.min_num_external_ifaces is not None or self.max_num_external_ifaces is not None:
162 # fetch interfaces for all, in one go
163 filters = basefilters.copy()
164 filters['node_id'] = list(candidates)
165 ifaces = dict(map(operator.itemgetter('node_id','interface_ids'),
166 self._api.GetNodes(filters=basefilters, fields=('node_id','interface_ids')) ))
168 # filter candidates by interface count
169 if self.min_num_external_ifaces is not None and self.max_num_external_ifaces is not None:
170 predicate = ( lambda node_id :
171 self.min_num_external_ifaces <= len(ifaces.get(node_id,())) <= self.max_num_external_ifaces )
172 elif self.min_num_external_ifaces is not None:
173 predicate = ( lambda node_id :
174 self.min_num_external_ifaces <= len(ifaces.get(node_id,())) )
176 predicate = ( lambda node_id :
177 len(ifaces.get(node_id,())) <= self.max_num_external_ifaces )
179 candidates = set(filter(predicate, candidates))
183 def assign_node_id(self, node_id):
184 self._node_id = node_id
185 self.fetch_node_info()
187 def fetch_node_info(self):
188 info = self._api.GetNodes(self._node_id)[0]
189 tags = dict( (t['tagname'],t['value'])
190 for t in self._api.GetNodeTags(node_id=self._node_id, fields=('tagname','value')) )
192 self.min_num_external_ifaces = None
193 self.max_num_external_ifaces = None
196 replacements = {'timeframe':self.timeframe}
197 for attr, tag in self.BASEFILTERS.iteritems():
200 setattr(self, attr, value)
201 for attr, (tag,_) in self.TAGFILTERS.iteritems():
202 tag = tag % replacements
205 setattr(self, attr, value)
207 if 'peer_id' in info:
208 self.site = self._api.peer_map[info['peer_id']]
210 if 'interface_ids' in info:
211 self.min_num_external_ifaces = \
212 self.max_num_external_ifaces = len(info['interface_ids'])
214 if 'ssh_rsa_key' in info:
215 self.server_key = info['ssh_rsa_key']
218 if self.home_path is None:
219 raise AssertionError, "Misconfigured node: missing home path"
220 if self.ident_path is None or not os.access(self.ident_path, os.R_OK):
221 raise AssertionError, "Misconfigured node: missing slice SSH key"
222 if self.slicename is None:
223 raise AssertionError, "Misconfigured node: unspecified slice"
225 def install_dependencies(self):
226 if self.required_packages:
227 # TODO: make dependant on the experiment somehow...
228 pidfile = self.DEPENDS_PIDFILE
229 logfile = self.DEPENDS_LOGFILE
231 # Start process in a "daemonized" way, using nohup and heavy
232 # stdin/out redirection to avoid connection issues
233 (out,err),proc = rspawn.remote_spawn(
234 "yum -y install %(packages)s" % {
235 'packages' : ' '.join(self.required_packages),
239 stderr = rspawn.STDOUT,
241 host = self.hostname,
243 user = self.slicename,
245 ident_key = self.ident_path,
246 server_key = self.server_key,
251 raise RuntimeError, "Failed to set up application: %s %s" % (out,err,)
253 def wait_dependencies(self, pidprobe=1, probe=0.5, pidmax=10, probemax=10):
254 if self.required_packages:
255 pidfile = self.DEPENDS_PIDFILE
259 for probenum in xrange(pidmax):
260 pidtuple = rspawn.remote_check_pid(
262 host = self.hostname,
264 user = self.slicename,
266 ident_key = self.ident_path,
267 server_key = self.server_key
275 raise RuntimeError, "Failed to obtain pidfile for dependency installer"
277 # wait for it to finish
278 while rspawn.RUNNING is rspawn.remote_status(
280 host = self.hostname,
282 user = self.slicename,
284 ident_key = self.ident_path,
285 server_key = self.server_key
288 probe = min(probemax, 1.5*probe)
291 # Make sure all the paths are created where
292 # they have to be created for deployment
293 (out,err),proc = server.popen_ssh_command(
295 host = self.hostname,
297 user = self.slicename,
299 ident_key = self.ident_path,
300 server_key = self.server_key
305 elif not err and out.strip() == 'ALIVE':