+#
"""The database houses information on slivers. This information
reaches the sliver manager in two different ways: one, through the
GetSlivers() call made periodically; two, by users delivering tickets.
partition, the database is constantly being dumped to disk.
"""
-import cPickle
+import sys
+
+import pickle
import threading
import time
-import accounts
+import account
import logger
import tools
+import bwmon
+# hopefully temporary
+# is there a good reason to have this done here and not in a plugin ?
+try: from coresched_lxc import CoreSched
+except: from coresched_vs import CoreSched
# We enforce minimum allocations to keep the clueless from hosing their slivers.
# Disallow disk loans because there's currently no way to punish slivers over quota.
-MINIMUM_ALLOCATION = {'cpu_min': 0, 'cpu_share': 16, 'net_min_rate': 0, 'net_max_rate': 8, 'net_i2_min_rate': 0, 'net_i2_max_rate': 8, 'net_share': 1}
-LOANABLE_RESOURCES = MINIMUM_ALLOCATION.keys()
+MINIMUM_ALLOCATION = {'cpu_pct': 0,
+ 'cpu_share': 1,
+ 'net_min_rate': 0,
+ 'net_max_rate': 8,
+ 'net_i2_min_rate': 0,
+ 'net_i2_max_rate': 8,
+ 'net_share': 1,
+ }
+LOANABLE_RESOURCES = list(MINIMUM_ALLOCATION.keys())
-DB_FILE = '/root/sliver_mgr_db.pickle'
+DB_FILE = '/var/lib/nodemanager/database.pickle'
# database object and associated lock
self._min_timestamp = 0
def _compute_effective_rspecs(self):
- """Calculate the effects of loans and store the result in field _rspec. At the moment, we allow slivers to loan only those resources that they have received directly from PLC. In order to do the accounting, we store three different rspecs: field 'rspec', which is the resources given by PLC; field '_rspec', which is the actual amount of resources the sliver has after all loans; and variable resid_rspec, which is the amount of resources the sliver has after giving out loans but not receiving any."""
+ """Calculate the effects of loans and store the result in field _rspec.
+At the moment, we allow slivers to loan only those resources that they have received directly from PLC.
+In order to do the accounting, we store three different rspecs:
+ * field 'rspec', which is the resources given by PLC;
+ * field '_rspec', which is the actual amount of resources the sliver has after all loans;
+ * and variable resid_rspec, which is the amount of resources the sliver
+ has after giving out loans but not receiving any."""
slivers = {}
- for name, rec in self.iteritems():
+ for name, rec in self.items():
if 'rspec' in rec:
rec['_rspec'] = rec['rspec'].copy()
slivers[name] = rec
- for rec in slivers.itervalues():
+ for rec in slivers.values():
eff_rspec = rec['_rspec']
resid_rspec = rec['rspec'].copy()
- for target, resname, amt in rec.get('_loans', []):
- if target in slivers and amt <= resid_rspec[resname] - MINIMUM_ALLOCATION[resname]:
- eff_rspec[resname] -= amt
- resid_rspec[resname] -= amt
- slivers[target]['_rspec'][resname] += amt
+ for target, resource_name, amount in rec.get('_loans', []):
+ if target in slivers and amount <= resid_rspec[resource_name] - MINIMUM_ALLOCATION[resource_name]:
+ eff_rspec[resource_name] -= amount
+ resid_rspec[resource_name] -= amount
+ slivers[target]['_rspec'][resource_name] += amount
def deliver_record(self, rec):
- """A record is simply a dictionary with 'name' and 'timestamp' keys. We keep some persistent private data in the records under keys that start with '_'; thus record updates should not displace such keys."""
+ """A record is simply a dictionary with 'name' and 'timestamp'
+keys. We keep some persistent private data in the records under keys
+that start with '_'; thus record updates should not displace such
+keys."""
if rec['timestamp'] < self._min_timestamp: return
name = rec['name']
old_rec = self.get(name)
- if old_rec == None: self[name] = rec
+ if old_rec == None:
+ self[name] = rec
elif rec['timestamp'] > old_rec['timestamp']:
- for key in old_rec.keys():
- if not key.startswith('_'): del old_rec[key]
+ for key in list(old_rec.keys()):
+ if not key.startswith('_'):
+ del old_rec[key]
old_rec.update(rec)
def set_min_timestamp(self, ts):
- """The ._min_timestamp member is the timestamp on the last comprehensive update. We use it to determine if a record is stale. This method should be called whenever new GetSlivers() data comes in."""
+ """The ._min_timestamp member is the timestamp on the last comprehensive update.
+We use it to determine if a record is stale.
+This method should be called whenever new GetSlivers() data comes in."""
self._min_timestamp = ts
- for name, rec in self.items():
+ for name, rec in list(self.items()):
if rec['timestamp'] < ts: del self[name]
def sync(self):
- """Synchronize reality with the database contents. This method does a lot of things, and it's currently called after every single batch of database changes (a GetSlivers(), a loan, a record). It may be necessary in the future to do something smarter."""
+ """Synchronize reality with the database contents. This
+method does a lot of things, and it's currently called after every
+single batch of database changes (a GetSlivers(), a loan, a record).
+It may be necessary in the future to do something smarter."""
# delete expired records
now = time.time()
- for name, rec in self.items():
+ for name, rec in list(self.items()):
if rec.get('expires', now) < now: del self[name]
self._compute_effective_rspecs()
+ try:
+ coresched = CoreSched()
+ coresched.adjustCores(self)
+ except:
+ logger.log_exc("database: exception while doing core sched")
+
# create and destroy accounts as needed
- existing_acct_names = accounts.all()
+ logger.verbose("database: sync : fetching accounts")
+ existing_acct_names = account.all()
for name in existing_acct_names:
- if name not in self: accounts.get(name).ensure_destroyed()
- for name, rec in self.iteritems():
- if rec['instantiation'] == 'plc-instantiated': accounts.get(name).ensure_created(rec)
-
- # request a database dump
+ if name not in self:
+ logger.verbose("database: sync : ensure_destroy'ing %s"%name)
+ account.get(name).ensure_destroyed()
+ for name, rec in self.items():
+ # protect this; if anything fails for a given sliver
+ # we still need the other ones to be handled
+ try:
+ sliver = account.get(name)
+ logger.verbose("database: sync : looping on %s (shell account class from pwd %s)" %(name, sliver._get_class()))
+ # Make sure we refresh accounts that are running
+ if rec['instantiation'] == 'plc-instantiated':
+ logger.verbose ("database: sync : ensure_create'ing 'instantiation' sliver %s"%name)
+ sliver.ensure_created(rec)
+ elif rec['instantiation'] == 'nm-controller':
+ logger.verbose ("database: sync : ensure_create'ing 'nm-controller' sliver %s"%name)
+ sliver.ensure_created(rec)
+ # Back door to ensure PLC overrides Ticket in delegation.
+ elif rec['instantiation'] == 'delegated' and sliver._get_class() != None:
+ # if the ticket has been delivered and the nm-controller started the slice
+ # update rspecs and keep them up to date.
+ if sliver.is_running():
+ logger.verbose ("database: sync : ensure_create'ing 'delegated' sliver %s"%name)
+ sliver.ensure_created(rec)
+ except SystemExit as e:
+ sys.exit(e)
+ except:
+ logger.log_exc("database: sync failed to handle sliver", name=name)
+
+ # Wake up bwmom to update limits.
+ bwmon.lock.set()
global dump_requested
dump_requested = True
db_cond.notify()
def start():
- """The database dumper daemon. When it starts up, it populates the database with the last dumped database. It proceeds to handle dump requests forever."""
+ """The database dumper daemon.
+When it starts up, it populates the database with the last dumped database.
+It proceeds to handle dump requests forever."""
def run():
global dump_requested
while True:
db_lock.acquire()
while not dump_requested: db_cond.wait()
- db_pickle = cPickle.dumps(db, cPickle.HIGHEST_PROTOCOL)
+ db_pickle = pickle.dumps(db, pickle.HIGHEST_PROTOCOL)
dump_requested = False
db_lock.release()
- try: tools.write_file(DB_FILE, lambda f: f.write(db_pickle))
- except: logger.log_exc()
+ try:
+ tools.write_file(
+ DB_FILE, lambda f: f.write(db_pickle), binary=True)
+ logger.log_database(db)
+ except:
+ logger.log_exc("database.start: failed to pickle/dump")
global db
try:
f = open(DB_FILE)
- try: db = cPickle.load(f)
+ try: db = pickle.load(f)
finally: f.close()
+ except IOError:
+ logger.log ("database: Could not load %s -- starting from a fresh database"%DB_FILE)
+ db = Database()
except:
- logger.log_exc()
+ logger.log_exc("database: failed in start")
db = Database()
+ logger.log('database.start')
tools.as_daemon_thread(run)
git://git.onelab.eu / nodemanager.git / blobdiff