2 # -*- coding: utf-8 -*-
4 from constants import TESTBED_ID
14 from nepi.util import server
18 # Map Node attribute to plcapi filter name
19 'hostname' : 'hostname',
23 # Map Node attribute to (<tag name>, <plcapi filter expression>)
24 # There are replacements that are applied with string formatting,
25 # so '%' has to be escaped as '%%'.
26 'architecture' : ('arch','value'),
27 'operating_system' : ('fcdistro','value'),
28 'pl_distro' : ('pldistro','value'),
29 'min_reliability' : ('reliability%(timeframe)s', ']value'),
30 'max_reliability' : ('reliability%(timeframe)s', '[value'),
31 'min_bandwidth' : ('bw%(timeframe)s', ']value'),
32 'max_bandwidth' : ('bw%(timeframe)s', '[value'),
35 DEPENDS_PIDFILE = '/tmp/nepi-depends.pid'
36 DEPENDS_LOGFILE = '/tmp/nepi-depends.log'
38 def __init__(self, api=None):
45 self.architecture = None
46 self.operating_system = None
50 self.min_reliability = None
51 self.max_reliability = None
52 self.min_bandwidth = None
53 self.max_bandwidth = None
54 self.min_num_external_ifaces = None
55 self.max_num_external_ifaces = None
58 # Applications and routes add requirements to connected nodes
59 self.required_packages = set()
60 self.required_vsys = set()
62 self.env = collections.defaultdict(list)
64 # Testbed-derived attributes
66 self.ident_path = None
67 self.server_key = None
70 # Those are filled when an actual node is allocated
74 def _nepi_testbed_environment_setup(self):
75 command = cStringIO.StringIO()
76 command.write('export PYTHONPATH=$PYTHONPATH:%s' % (
77 ':'.join(["${HOME}/"+server.shell_escape(s) for s in self.pythonpath])
79 command.write(' ; export PATH=$PATH:%s' % (
80 ':'.join(["${HOME}/"+server.shell_escape(s) for s in self.pythonpath])
83 for envkey, envvals in self.env.iteritems():
84 for envval in envvals:
85 command.write(' ; export %s=%s' % (envkey, envval))
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 # only pick healthy nodes
113 basefilters['run_level'] = 'boot'
114 basefilters['boot_state'] = 'boot'
116 # keyword-only "pseudofilters"
119 extra['peer'] = self.site
121 candidates = set(map(operator.itemgetter('node_id'),
122 self._api.GetNodes(filters=basefilters, fields=fields, **extra)))
124 # filter by tag, one tag at a time
125 applicable = self.applicable_filters
126 for tagfilter in self.TAGFILTERS.iteritems():
127 attr, (tagname, expr) = tagfilter
129 # don't bother if there's no filter defined
130 if attr in applicable:
131 tagfilter = basefilters.copy()
132 tagfilter['tagname'] = tagname % replacements
133 tagfilter[expr % replacements] = getattr(self,attr)
134 tagfilter['node_id'] = list(candidates)
136 candidates &= set(map(operator.itemgetter('node_id'),
137 self._api.GetNodeTags(filters=tagfilter, fields=fields)))
139 # filter by vsys tags - special case since it doesn't follow
140 # the usual semantics
141 if self.required_vsys:
142 newcandidates = collections.defaultdict(set)
144 vsys_tags = self._api.GetNodeTags(
146 node_id = list(candidates),
147 fields = ['node_id','value'])
150 operator.itemgetter(['node_id','value']),
153 required_vsys = self.required_vsys
154 for node_id, value in vsys_tags:
155 if value in required_vsys:
156 newcandidates[value].add(node_id)
158 # take only those that have all the required vsys tags
159 newcandidates = reduce(
160 lambda accum, new : accum & new,
161 newcandidates.itervalues(),
164 # filter by iface count
165 if self.min_num_external_ifaces is not None or self.max_num_external_ifaces is not None:
166 # fetch interfaces for all, in one go
167 filters = basefilters.copy()
168 filters['node_id'] = list(candidates)
169 ifaces = dict(map(operator.itemgetter('node_id','interface_ids'),
170 self._api.GetNodes(filters=basefilters, fields=('node_id','interface_ids')) ))
172 # filter candidates by interface count
173 if self.min_num_external_ifaces is not None and self.max_num_external_ifaces is not None:
174 predicate = ( lambda node_id :
175 self.min_num_external_ifaces <= len(ifaces.get(node_id,())) <= self.max_num_external_ifaces )
176 elif self.min_num_external_ifaces is not None:
177 predicate = ( lambda node_id :
178 self.min_num_external_ifaces <= len(ifaces.get(node_id,())) )
180 predicate = ( lambda node_id :
181 len(ifaces.get(node_id,())) <= self.max_num_external_ifaces )
183 candidates = set(filter(predicate, candidates))
187 def assign_node_id(self, node_id):
188 self._node_id = node_id
189 self.fetch_node_info()
191 def fetch_node_info(self):
192 info = self._api.GetNodes(self._node_id)[0]
193 tags = dict( (t['tagname'],t['value'])
194 for t in self._api.GetNodeTags(node_id=self._node_id, fields=('tagname','value')) )
196 self.min_num_external_ifaces = None
197 self.max_num_external_ifaces = None
200 replacements = {'timeframe':self.timeframe}
201 for attr, tag in self.BASEFILTERS.iteritems():
204 setattr(self, attr, value)
205 for attr, (tag,_) in self.TAGFILTERS.iteritems():
206 tag = tag % replacements
209 setattr(self, attr, value)
211 if 'peer_id' in info:
212 self.site = self._api.peer_map[info['peer_id']]
214 if 'interface_ids' in info:
215 self.min_num_external_ifaces = \
216 self.max_num_external_ifaces = len(info['interface_ids'])
218 if 'ssh_rsa_key' in info:
219 self.server_key = info['ssh_rsa_key']
222 if self.home_path is None:
223 raise AssertionError, "Misconfigured node: missing home path"
224 if self.ident_path is None or not os.access(self.ident_path, os.R_OK):
225 raise AssertionError, "Misconfigured node: missing slice SSH key"
226 if self.slicename is None:
227 raise AssertionError, "Misconfigured node: unspecified slice"
229 def install_dependencies(self):
230 if self.required_packages:
231 # TODO: make dependant on the experiment somehow...
232 pidfile = self.DEPENDS_PIDFILE
233 logfile = self.DEPENDS_LOGFILE
235 # Start process in a "daemonized" way, using nohup and heavy
236 # stdin/out redirection to avoid connection issues
237 (out,err),proc = rspawn.remote_spawn(
238 "yum -y install %(packages)s" % {
239 'packages' : ' '.join(self.required_packages),
243 stderr = rspawn.STDOUT,
245 host = self.hostname,
247 user = self.slicename,
249 ident_key = self.ident_path,
250 server_key = self.server_key,
255 raise RuntimeError, "Failed to set up application: %s %s" % (out,err,)
257 def wait_dependencies(self, pidprobe=1, probe=0.5, pidmax=10, probemax=10):
258 if self.required_packages:
259 pidfile = self.DEPENDS_PIDFILE
263 for probenum in xrange(pidmax):
264 pidtuple = rspawn.remote_check_pid(
266 host = self.hostname,
268 user = self.slicename,
270 ident_key = self.ident_path,
271 server_key = self.server_key
279 raise RuntimeError, "Failed to obtain pidfile for dependency installer"
281 # wait for it to finish
282 while rspawn.RUNNING is rspawn.remote_status(
284 host = self.hostname,
286 user = self.slicename,
288 ident_key = self.ident_path,
289 server_key = self.server_key
292 probe = min(probemax, 1.5*probe)
295 # Make sure all the paths are created where
296 # they have to be created for deployment
297 (out,err),proc = server.popen_ssh_command(
299 host = self.hostname,
301 user = self.slicename,
303 ident_key = self.ident_path,
304 server_key = self.server_key
309 elif not err and out.strip() == 'ALIVE':
315 def configure_routes(self, routes, devs):
317 Add the specified routes to the node's routing table
323 if dev.routes_here(route):
325 dest, prefix, nexthop = route
327 "add %s%s gw %s %s" % (
329 (("/%d" % (prefix,)) if prefix and prefix != 32 else ""),
338 raise RuntimeError, "Route %s cannot be bound to any virtual interface " \
339 "- PL can only handle rules over virtual interfaces. Candidates are: %s" % (route,devs)
341 (out,err),proc = server.popen_ssh_command(
342 "( sudo -S bash -c 'cat /vsys/vroute.out >&2' & ) ; sudo -S bash -c 'cat > /vsys/vroute.in' ; sleep 0.1" % dict(
343 home = server.shell_escape(self.home_path)),
344 host = self.hostname,
346 user = self.slicename,
348 ident_key = self.ident_path,
349 server_key = self.server_key,
350 stdin = '\n'.join(rules)
353 if proc.wait() or err:
354 raise RuntimeError, "Could not set routes (%s) errors: %s%s" % (rules,out,err)