/
algo.py
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/
algo.py
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"""
Algorithm for modifying database.
"""
import sys
import logging
import traceback
from testpooldb import models
import testpool.core.api
import testpool.core.ext
ACTION_ATTR = "attr"
ACTION_CLONE = "clone"
ACTION_DESTROY = models.Resource.ACTION_DESTROY
ACTION_STATUS = "status"
ACTION_NONE = "none"
class ResourceReleased(Exception):
""" Resource already relased. """
def __init__(self, value):
""" Name of resource. """
Exception.__init__(self)
self.value = value
def __str__(self):
""" Return the name of the resource. """
return repr(self.value)
class NoResources(Exception):
""" Resource does not exist. """
def __init__(self, value):
""" Name of resource. """
Exception.__init__(self)
self.value = value
def __str__(self):
""" Return the name of the resource. """
return repr(self.value)
def onerror(name):
""" Show module that fails to load. """
logging.error("importing module %s", name)
_, _, trback = sys.exc_info()
traceback.print_tb(trback)
def adapt(pool, profile):
""" Adapt the pool to the profile size.
@return Returns the number of changes. Positive number indicates the
number of resources created.
"""
logging.debug("%s: adapt started", profile.name)
changes = 0
##
# Check the database for the list of existing and pending virtual
# items.
current = profile.resource_set.count()
##
if current == profile.resource_max:
return changes
elif current > profile.resource_max:
##
# Too many resources we need to remove one.
how_many = current - profile.resource_max
for rsrc in profile.resource_set.reverse():
if rsrc.status in [models.Resource.READY, models.Resource.PENDING]:
rsrc.transition(models.Resource.PENDING, ACTION_DESTROY, 1)
how_many -= 1
if how_many <= 0:
break
else:
missing = profile.resource_max - current
logging.debug("%s: adapt too few make %d more", profile.name, missing)
##
# There are not enough resources. Try to reuse the range of
# names from 0 to resource_max. Start at 0 and walk up the range
# looking for free slots.
for count in range(profile.resource_max):
name = pool.new_name_get(profile.template_name, count)
logging.info("%s checking", name)
(rsrc, action) = models.Resource.objects.get_or_create(
profile=profile, name=name)
if not action:
# This is an existing resource. Keep looking
continue
state = pool.state_get(name)
logging.debug("%s status %s", name, state)
# If action is true then the database entry was just created.
# If state == STATE_NONE then this name does not exist.
if state == testpool.core.api.Pool.STATE_NONE:
# This is a new database entry and the resource does
# not exist. Clone this.
logging.debug("%s expanding pool resource with %s ",
profile.name, name)
rsrc.transition(models.Resource.PENDING, ACTION_CLONE, 1)
changes += 1
missing -= 1
else:
logging.warning("%s: lost track of resource %s reclaiming",
profile.name, rsrc.name)
##
# Need to destroy the resource because we do not know its
# real state.
rsrc.transition(models.Resource.PENDING, ACTION_DESTROY, 1)
##
changes += 1
missing -= 1
if missing == 0:
break
return changes
def clone(pool, rsrc):
""" Clone a resource. """
pool.clone(rsrc.profile.template_name, rsrc.name)
state = pool.start(rsrc.name)
logging.debug("%s resource clone state %s", rsrc.profile.name, state)
if state != testpool.core.api.Pool.STATE_RUNNING:
logging.error("%s resource clone %s failed", rsrc.profile.name,
rsrc.name)
rsrc.transition(models.Resource.BAD, ACTION_DESTROY, 1)
else:
logging.debug("%s resource cloned %s", rsrc.profile.name, rsrc.name)
rsrc.transition(models.Resource.PENDING, ACTION_ATTR, 1)
def attr(pool, rsrc):
""" Retrieve resource attributes. """
rsrc.ip_addr = pool.ip_get(rsrc.name)
for (key, value) in pool.resource_attr_get(rsrc.name).iteritems():
(kvp, _) = models.KVP.get_or_create(key, value)
models.ResourceKVP.objects.create(resource=rsrc, kvp=kvp)
rsrc.transition(models.Resource.READY, ACTION_STATUS, 10*60)
def destroy(pool, profile):
""" Reset profile and remove all resources from the host. """
for rsrc in profile.resource_set.all():
name = rsrc.name
logging.debug("%s removing resource %s", profile.name, name)
state = pool.state_get(name)
if state != testpool.core.api.Pool.STATE_NONE:
pool.destroy(name)
try:
rsrc = models.Resource.objects.get(profile=profile, name=name)
rsrc.delete()
except models.Resource.DoesNotExist:
pass
def pop(profile_name, expiration_seconds):
""" Pop one resource from the Pool. """
logging.info("algo.pop resource from %s", profile_name)
profile1 = models.Profile.objects.get(name=profile_name)
rsrcs = models.Resource.objects.filter(profile=profile1,
status=models.Resource.PENDING)
if rsrcs.count() == 0:
raise NoResources("%s: all resources taken" % profile_name)
rsrc = rsrcs[0]
rsrc.transition(models.Resource.RESERVED, ACTION_DESTROY,
expiration_seconds)
rsrc.status = models.Resource.RESERVED
rsrc.save()
return rsrc
def push(rsrc_id):
""" Push one resource by id. """
logging.info("push %d", rsrc_id)
try:
rsrc = models.Resource.objects.get(id=rsrc_id,
status=models.Resource.RESERVED)
rsrc.release()
return 0
except models.Resource.DoesNotExist:
raise ResourceReleased(rsrc_id)
def resource_clone(pool, rsrc):
""" Reclaim a resource and rebuild it. """
logging.debug("reclaiming %s", rsrc.name)
pool.clone(rsrc.profile.template_name, rsrc.name)
pool.start(rsrc.name)
rsrc.transition(models.Resource.PENDING, ACTION_ATTR, 1)
def resource_destroy(pool, rsrc):
""" Destroy a single resource. """
name = rsrc.name
logging.debug("%s removing resource %s", rsrc.profile.name, name)
state = pool.state_get(name)
if state == testpool.core.api.Pool.STATE_NONE:
##
# actual resource is gone.
rsrc.delete()
##
else:
pool.destroy(name)
##
# Attempted to destroy the resource. Check back some later time.
delta = pool.timing_get(testpool.core.api.Pool.TIMING_REQUEST_DESTROY)
rsrc.transition(rsrc.status, rsrc.action, delta)
##
def profile_add(connection, product, profile, resource_max, template):
""" Add a profile. """
logging.debug("profile_add %s %s", profile, template)
(host1, _) = models.Host.objects.get_or_create(connection=connection,
product=product)
defaults = {"resource_max": resource_max, "template_name": template}
(profile1, _) = models.Profile.objects.update_or_create(name=profile,
host=host1,
defaults=defaults)
##
# Check to see if the number of Resources should change.
exts = testpool.core.ext.api_ext_list()
pool = exts[product].pool_get(profile1)
adapt(pool, profile1)
##
return profile1
def profile_remove(name, immediate):
""" Remove a profile.
Profiles can't be removed immediately, Resources are marked for purge
and when all Resources are gone the profile will be removed.
"""
profile = models.Profile.objects.get(name=name)
logging.debug("found profile %s", profile)
profile.resource_max = 0
profile.save()
delta = 0
for rsrc in profile.resource_set.all():
if immediate:
rsrc.delete()
else:
rsrc.transition(models.Resource.RESERVED, ACTION_DESTROY, delta)
delta += 60
if immediate:
profile.delete()