X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=plugins%2Freservation.py;h=b5728d95c2005a5baa866b101bab4455eddf5bf4;hb=ac6786141feadccdc48b819ab21a825a54881ded;hp=21e3e55076c9e8e73369bb373a9ddf51f7b4e728;hpb=22d40df4ed31c001fd58966640ed0c5079d486e6;p=nodemanager.git

diff --git a/plugins/reservation.py b/plugins/reservation.py
index 21e3e55..b5728d9 100644
--- a/plugins/reservation.py
+++ b/plugins/reservation.py
@@ -1,36 +1,281 @@
-# $Id$
-# $URL$
 #
-# NodeManager plugin - first step of handling omf_controlled slices
+# NodeManager plugin - first step of handling reservable nodes
+# Thierry Parmentelat <thierry.parmentelat@inria.fr>
+#
 
 """
-Overwrites the 'resctl' tag of slivers controlled by OMF so sm.py does the right thing
+Manages running slices when reservation_policy is 'lease_or_idle' or 'lease_or_shared'
 """
 
+import time
+import threading
+
 import logger
+import account
+import database
 
+# there is an implicit assumption that this triggers after slicemanager
 priority = 45
-# this instructs nodemanager that we want to use the latest known data when the plc link is down
+
+# this instructs nodemanager that we want to use the latest known data in case the plc link is down
 persistent_data = True
 
-def start(options, conf):
-    logger.log("reservation: plugin starting up...")
+# of course things would be simpler if node manager was to create one instance of the plugins
+# instead of blindly caling functions in the module...
+
+##############################
+# rough implementation for a singleton class
+def Singleton (klass, *args, **kwds):
+    if not hasattr(klass, '_instance'):
+        klass._instance=klass(*args, **kwds)
+    return klass._instance
+
+def start():
+    return Singleton(reservation).start()
 
 def GetSlivers(data, conf = None, plc = None):
+    return Singleton(reservation).GetSlivers(data, conf, plc)
+
+##############################
+class reservation:
+
+    debug=False
+    debug=True
+
+    def __init__ (self):
+        # the last snapshot of data exposed by GetSlivers
+        self.data = None
+        # this is a dict mapping a raounded timestamp to the corr. Timer object
+        self.timers = {}
+
+    ####################
+    def start(self):
+        logger.log("reservation: plugin performing dummy start...")
+
+    # this method is entirely about making sure that we have events scheduled
+    # at the <granularity> intervals where there is a lease that starts or ends
+    def GetSlivers (self, data, conf=None, plc=None):
+
+        # check we're using a compliant GetSlivers
+        if 'reservation_policy' not in data:
+            logger.log_missing_data("reservation.GetSlivers", 'reservation_policy')
+            return
+        self.reservation_policy=data['reservation_policy']
+        if 'leases' not in data:
+            logger.log_missing_data("reservation.GetSlivers", 'leases')
+            return
+
+        # store data locally
+        # since we've asked for persistent_data, we should not get an empty data here
+        if data: self.data = data
+
+        # regular nodes are not affected
+        if self.reservation_policy == 'none':
+            return
+        elif self.reservation_policy not in ['lease_or_idle', 'lease_or_shared']:
+            logger.log("reservation: ignoring -- unexpected value for reservation_policy %r"%self.reservation_policy)
+            return
+        # at this point we have reservation_policy in ['lease_or_idle', 'lease_or_shared']
+        # we make no difference for now
+        logger.log("reservation.GetSlivers: reservable node -- policy=%s"%self.reservation_policy)
+        self.sync_timers_from_leases()
+        logger.log("reservation.GetSlivers: listing timers")
+        if reservation.debug:
+            self.list_timers()
+
+    ####################
+    # the granularity is set in the API (initial value is 15 minutes)
+    # and it used to round all leases start/until times
+    # changing this dynamically can have some weird effects of course..
+    def granularity (self):
+        try:
+            return self.data['lease_granularity']
+        # in case we'd try to access this before it's populated..
+        except:
+            return 60*60
+
+    # round to granularity
+    def round_time (self, time):
+        granularity=self.granularity()
+        return ((int(time)+granularity/2)/granularity)*granularity
+
+    def clear_timers (self):
+        for timer in self.timers.values():
+            timer.cancel()
+        self.timers={}
+
+    def sync_timers_from_leases (self):
+        self.clear_timers()
+        for lease in self.data['leases']:
+            self.ensure_timer_from_until(lease['t_from'], lease['t_until'])
+
+    # assuming t1<t2
+    def ensure_timer_from_until (self, t1, t2):
+        now=int(time.time())
+        # both times are in the past: forget about it
+        if t2 < now : return
+        # we're in the middle of the lease: make sure to arm a callback in the near future for checking
+        # this mostly is for starting the slice if nodemanager gets started in the middle of a lease
+        if t1 < now : 
+            self.ensure_timer (now, now+10)
+        # both are in the future : arm them
+        else :
+            self.ensure_timer (now, self.round_time(t1))
+            self.ensure_timer (now, self.round_time(t2))
+
+    def ensure_timer(self, now, timestamp):
+        if timestamp in self.timers: return
+        def this_closure ():
+            import time
+            logger.log("TIMER trigering at %s (was armed at %s, expected to trigger at %s)"%\
+                           (reservation.time_printable(time.time()),
+                            reservation.time_printable(now),
+                            reservation.time_printable(timestamp)))
+            self.granularity_callback (now)
+        timer=threading.Timer(timestamp-now, this_closure)
+        self.timers[timestamp]=timer
+        timer.start()
+
+    def list_timers(self):
+        timestamps=self.timers.keys()
+        timestamps.sort()
+        for timestamp in timestamps:
+            logger.log('reservation: TIMER armed for %s'%reservation.time_printable(timestamp))
+        logger.log('reservation.GetSlivers : end listing timers')
+
+
+    @staticmethod
+    def time_printable (timestamp):
+        return time.strftime ("%Y-%m-%d %H:%M UTC", time.gmtime(timestamp))
+
+    @staticmethod
+    def lease_printable (lease):
+        d=dict ( lease.iteritems())
+        d['from']=reservation.time_printable(lease['t_from'])
+        d['until']=reservation.time_printable(lease['t_from'])
+        s=[]
+        s.append("slice=%(name)s (%(slice_id)d)"%d)
+        s.append("from %(from)s"%d)
+        s.append("until %(until)s"%d)
+        return " ".join(s)
+
+    # this is invoked at the granularity boundaries where something happens (a lease ends or/and a lease starts)
+    def granularity_callback (self, time_arg):
+        now=int(time.time())
+        round_now=self.round_time(now)
+        leases=self.data['leases']
+        ###
+        if reservation.debug:
+            logger.log('reservation.granularity_callback now=%f round_now=%d arg=%d...'%(now, round_now, time_arg))
+        if leases and reservation.debug:
+            logger.log('reservation: Listing leases beg')
+            for lease in leases:
+                logger.log("reservation: lease="+reservation.lease_printable(lease))
+            logger.log('reservation: Listing leases end')
+
+        ### what do we have to do at this point in time?
+        ending_lease=None
+        for lease in leases:
+            if lease['t_until']==round_now:
+                logger.log('reservation: end of lease for slice %s - (lease=%s)'%(lease['name'], reservation.lease_printable(lease)))
+                ending_lease=lease
+        starting_lease=None
+        for lease in leases:
+            if lease['t_from']==round_now:
+                logger.log('reservation: start of lease for slice %s - (lease=%s)'%(lease['name'], reservation.lease_printable(lease)))
+                starting_lease=lease
+
+        ########## nothing is starting nor ending
+        if not ending_lease and not starting_lease:
+            ### this might be useful for robustness - not sure what to do now though
+            logger.log("reservation.granularity_callback: xxx todo - should make sure to start the running lease if relevant")
+        ########## something to start - something to end
+        elif ending_lease and starting_lease:
+            ## yes, but that's the same sliver
+            if ending_lease['name']==starting_lease['name']:
+                slicename=ending_lease['name']
+                if self.is_running(slicename):
+                    logger.log("reservation.granularity_callback: end/start of same sliver %s -- ignored"%ending_lease['name'])
+                else:
+                    logger.log("reservation.granularity_callback: mmh, the sliver is unexpectedly not running, starting it...")
+                    self.restart_slice(slicename)
+            ## two different slivers
+            else:
+                self.restart_slice(starting_lease['name'])
+                self.suspend_slice(ending_lease['name'])
+        ########## something to start, nothing to end
+        elif starting_lease and not ending_lease:
+            self.restart_slice(starting_lease['name'])
+            # with the lease_or_shared policy, this is mandatory
+            # otherwise it's just safe
+            self.suspend_all_slices(exclude=starting_lease['name'])
+        ########## so now, something to end, nothing to start
+        else:
+            self.suspend_slice (ending_lease['name'])
+            if self.reservation_policy=='lease_or_shared':
+                logger.log("reservation.granularity_callback: 'lease_or_shared' not implemented - using 'lease_or_idle'")
+            # only lease_or_idle policy available for now: we freeze the box
+            logger.log("reservation.granularity_callback: suspending all slices")
+            self.suspend_all_slices()
+
+    def debug_box(self, message, slicename=None):
+        if reservation.debug:
+            logger.log ('reservation: '+message)
+            logger.log_call( ['/usr/sbin/vserver-stat', ] )
+            if slicename:
+                logger.log_call ( ['/usr/sbin/vserver', slicename, 'status', ])
+
+    def is_running (self, slicename):
+        try:
+            return account.get(slicename).is_running()
+        except:
+            return False
+
+    # quick an d dirty - this does not obey the account/sliver_vs/controller hierarchy
+    def suspend_slice(self, slicename):
+        logger.log('reservation: Suspending slice %s'%(slicename))
+        self.debug_box('before suspending', slicename)
+        worker=account.get(slicename)
+        try:
+            logger.log("reservation: Located worker object %r"%worker)
+            worker.stop()
+        except AttributeError:
+            # when the underlying worker is not entirely initialized yet
+            pass
+        except:
+            logger.log_exc("reservation.suspend_slice: Could not stop slice through its worker", name=slicename)
+        # we hope the status line won't return anything
+        self.debug_box('after suspending', slicename)
+
+    # exclude can be a slicename or a list
+    # this probably should run in parallel
+    def suspend_all_slices (self, exclude=[]):
+        if isinstance(exclude, str): exclude=[exclude,]
+        for sliver in self.data['slivers']:
+            # skip excluded
+            if sliver['name'] in exclude: continue
+            # is this a system sliver ?
+            system_slice=False
+            for d in sliver['attributes']:
+                if d['tagname']=='system' and d['value'] : system_slice=True
+            if system_slice: continue
+            self.suspend_slice(sliver['name'])
 
-    if 'reservation_policy' not in data: 
-        logger.log_missing_data("reservation.GetSlivers",'reservation_policy')
-        return
-    reservation_policy=data['reservation_policy']
-
-    if 'leases' not in data: 
-        logger.log_missing_data("reservation.GetSlivers",'leases')
-        return
-
-    if reservation_policy in ['lease_or_idle','lease_or_shared']:
-        logger.log( 'reservation.GetSlivers - scaffolding...')
-    elif reservation_policy == 'none':
-        return
-    else:
-        logger.log("reservation: ignoring -- unexpected value for reservation_policy %r"%reservation_policy)
-        return
+    def restart_slice(self, slicename):
+        logger.log('reservation: Restarting slice %s'%(slicename))
+        self.debug_box('before restarting', slicename)
+        worker=account.get(slicename)
+        try:
+            # dig in self.data to retrieve corresponding rec
+            slivers = [ sliver for sliver in self.data['slivers'] if sliver['name']==slicename ]
+            sliver=slivers[0]
+            record=database.db.get(slicename)
+            record['enabled']=True
+            #
+            logger.log("reservation: Located worker object %r"%worker)
+            logger.log("reservation: Located record at the db %r"%record)
+            worker.start(record)
+        except:
+            logger.log_exc("reservation.restart_slice: Could not start slice through its worker", name=slicename)
+        # we hope the status line won't return anything
+        self.debug_box('after restarting', slicename)