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link.py
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link.py
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# -*- coding: utf-8 -*-
# ToMaTo (Topology management software)
# Copyright (C) 2013 Dennis Schwerdel, University of Kaiserslautern
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>
from .db import *
from . import scheduler
from datetime import timedelta
from .host.site import Site
from lib import util, logging #@UnresolvedImport
from lib.error import UserError
import time, random, threading
TYPES = ["single", "5minutes", "hour", "day", "month", "year"]
KEEP_RECORDS = {
"single": 10,
"5minutes": 12,
"hour": 24,
"day": 30,
"month": 12,
"year": 5,
}
MAX_AGE = {
"single": timedelta(minutes=2*KEEP_RECORDS["single"]),
"5minutes": timedelta(minutes=2*5*KEEP_RECORDS["5minutes"]),
"hour": timedelta(hours=2*KEEP_RECORDS["hour"]),
"day": timedelta(days=2*KEEP_RECORDS["day"]),
"month": timedelta(days=2*30*KEEP_RECORDS["month"]),
"year": timedelta(days=2*365*KEEP_RECORDS["year"])
}
class LinkMeasurement(ExtDocument, EmbeddedDocument):
begin = FloatField(required=True, db_field="b")
end = FloatField(required=True, db_field="e")
measurements = IntField(required=True, db_field="m")
loss = FloatField(required=True, db_field="l")
delayAvg = FloatField(db_field='da', required=True)
delayStddev = FloatField(db_field='ds', required=True)
def info(self):
return {
"begin": self.begin,
"end": self.end,
"measurements": self.measurements,
"loss": self.loss,
"delay_avg": self.delayAvg,
"delay_stddev": self.delayStddev
}
class LinkStatistics(BaseDocument):
"""
:type siteA: host.site.Site
:type siteB: host.site.Site
:type single: list of LinkMeasurement
:type by5minutes: list of LinkMeasurement
:type byHour: list of LinkMeasurement
:type byDay: list of LinkMeasurement
:type byMonth: list of LinkMeasurement
:type byYear: list of LinkMeasurement
"""
siteA = ReferenceField(Site, db_field='site_a', required=True, reverse_delete_rule=CASCADE)
siteB = ReferenceField(Site, db_field='site_b', required=True, unique_with='siteA', reverse_delete_rule=CASCADE)
single = ListField(EmbeddedDocumentField(LinkMeasurement), db_field='single')
by5minutes = ListField(EmbeddedDocumentField(LinkMeasurement), db_field='5minutes')
byHour = ListField(EmbeddedDocumentField(LinkMeasurement), db_field='hour')
byDay = ListField(EmbeddedDocumentField(LinkMeasurement), db_field='day')
byMonth = ListField(EmbeddedDocumentField(LinkMeasurement), db_field='month')
byYear = ListField(EmbeddedDocumentField(LinkMeasurement), db_field='year')
meta = {
'collection': 'link_statistics',
'ordering': ['siteA', 'siteB'],
'indexes': [
('siteA', 'siteB')
]
}
def _getList(self, type_):
"""
:rtype: list of UsageRecord
"""
if type_ == "single":
return self.single
elif type_ == "5minutes":
return self.by5minutes
elif type_ == "hour":
return self.byHour
elif type_ == "day":
return self.byDay
elif type_ == "month":
return self.byMonth
elif type_ == "year":
return self.byYear
def info(self):
return {
"siteA": self.siteA.name,
"siteB": self.siteB.name,
"single": [lm.info() for lm in self.single],
"5minutes": [lm.info() for lm in self.by5minutes],
"hour": [lm.info() for lm in self.byHour],
"day": [lm.info() for lm in self.byDay],
"month": [lm.info() for lm in self.byMonth],
"year": [lm.info() for lm in self.byYear],
}
def add(self, measurement):
self.single.append(measurement)
self.save()
def quickInfo(self):
if self.by5minutes:
fminutes = max(self.by5minutes, key=lambda r: r.end)
else:
fminutes = None
if self.byHour:
hour = max(self.byHour, key=lambda r: r.end)
else:
hour = None
if self.byDay:
day = max(self.byDay, key=lambda r: r.end)
else:
day = None
if self.byMonth:
month = max(self.byMonth, key=lambda r: r.end)
else:
month = None
if self.byYear:
year = max(self.byYear, key=lambda r: r.end)
else:
year = None
return {
"5minutes": fminutes,
"hour": hour,
"day": day,
"month": month,
"year": year
}
pingingLock = threading.RLock()
pinging = set()
@util.wrap_task
def ping(siteA, siteB, ignore_missing_site=False):
if isinstance(siteA, str):
siteA = Site.get(siteA)
if isinstance(siteB, str):
siteB = Site.get(siteB)
if (siteA is None or siteB is None) and ignore_missing_site:
return
if siteA is None:
raise UserError(UserError.ENTITY_DOES_NOT_EXIST, "site does not exist", data={"site": siteA})
if siteB is None:
raise UserError(UserError.ENTITY_DOES_NOT_EXIST, "site does not exist", data={"site": siteB})
key = (siteA, siteB)
with pingingLock:
if key in pinging:
return
pinging.add(key)
try:
try:
stats = LinkStatistics.objects.get(siteA=siteA, siteB=siteB)
except LinkStatistics.DoesNotExist:
stats = LinkStatistics(siteA=siteA, siteB=siteB).save()
choices = list(siteA.hosts.all())
hostA = None
while choices and not hostA:
hostA = random.choice(choices)
if hostA.problems():
choices.remove(hostA)
hostA = None
if not hostA:
return
choices = list(siteB.hosts.all())
if hostA in choices:
choices.remove(hostA)
hostB = None
while choices and not hostB:
hostB = random.choice(choices)
if hostB.problems():
choices.remove(hostB)
hostB = None
if not hostB:
return
begin = time.time()
res = hostA.getProxy().host_ping(hostB.address)
end = time.time()
logging.logMessage("link measurement", category="link", siteA=siteA.name, siteB=siteB.name, hostA=hostA.name, hostB=hostB.name, result=res)
stats.add(LinkMeasurement(begin=begin, end=end, loss=res['loss'], delayAvg=res.get("rtt_avg", 0.0)/2.0, delayStddev=res.get("rtt_mdev", 0.0)/2.0, measurements=res["transmitted"]))
finally:
with pingingLock:
pinging.remove(key)
def get_site_pairs():
pairs = set()
for siteA in Site.objects.all():
if not siteA.hosts.count():
continue
for siteB in Site.objects.all():
if siteA.id >= siteB.id:
continue
if not siteB.hosts.count():
continue
pairs.add((siteA, siteB))
pairs.add((siteA, siteA))
return pairs
@util.wrap_task
def housekeep():
exec_js(js_code("link_housekeep"), now=time.time(), types=TYPES, keep_records=KEEP_RECORDS, max_age={k: v.total_seconds() for k, v in MAX_AGE.items()})
def getStatistics(siteA, siteB):
_siteA = Site.get(siteA)
_siteB = Site.get(siteB)
UserError.check(_siteA is not None, UserError.ENTITY_DOES_NOT_EXIST, "site does not exist", data={"site": siteA})
UserError.check(_siteB is not None, UserError.ENTITY_DOES_NOT_EXIST, "site does not exist", data={"site": siteB})
if _siteA.id > _siteB.id:
_siteA, _siteB = _siteB, _siteA
try:
return LinkStatistics.objects.get(siteA=_siteA, siteB=_siteB)
except LinkStatistics.DoesNotExist:
ping(_siteA, _siteB)
return LinkStatistics.objects.get(siteA=_siteA, siteB=_siteB)
def getStatisticsInfo(siteA, siteB): #@ReservedAssignment
return getStatistics(siteA, siteB).info()
scheduler.scheduleMaintenance(60, get_site_pairs, lambda pair: ping(pair[0], pair[1], ignore_missing_site=True)) # every minute
scheduler.scheduleRepeated(60, housekeep) # every minute