def find_resource(self, resource_id):
# This can only happen in the master!
assert self.server.is_master()
# Lineair scan through all the resources in the state to find this
# resource.
for r in self.wrapped_state.resource:
if r.resource_id == resource_id:
return r
# The resource was not found. Find the resource template which
# describes this resource.
t = global_config.find_resource_template(resource_id)
# No template found.
if not t:
logger.error(
'Cannot create server state entry for resource %s (no template)' %
resource_id)
return None
# We got the template. Now create a new blank resource entry in the server
# state.
logger.info(
'%s creating new resource %s' %
(self.get_server_id(), resource_id))
r = self.wrapped_state.resource.add()
r.template.CopyFrom(t)
r.resource_id = resource_id
# Calculates the time this resource went out of learning mode.
# Note: This time may be in the past.
r.learning_mode_expiry_time = self.wrapped_state.election_victory_time + \
AlgorithmImpl.create(t, self.wrapped_state.server_level).get_max_lease_duration()
if r.learning_mode_expiry_time > clock.get_time():
logger.info(
'%s putting resource %s in learning mode until T=%d' %
(self.get_server_id(), resource_id,
r.learning_mode_expiry_time))
# Schedules an action to log a message when this resource leaves
# learning mode.
scheduler.add_absolute(
r.learning_mode_expiry_time + 1, _LeaveLearningMode(),
(self.get_server_id(), r.resource_id))
# Note: At this point this server has not capacity lease for this resource.
# It is up to the caller to deal with this.
assert r.IsInitialized()
return r
def find_resource(self, resource_id):
# This can only happen in the master!
assert self.server.is_master()
# Lineair scan through all the resources in the state to find this
# resource.
for r in self.wrapped_state.resource:
if r.resource_id == resource_id:
return r
# The resource was not found. Find the resource template which
# describes this resource.
t = global_config.find_resource_template(resource_id)
# No template found.
if not t:
logger.error(
'Cannot create server state entry for resource %s (no template)'
% resource_id)
return None
# We got the template. Now create a new blank resource entry in the server
# state.
logger.info('%s creating new resource %s' %
(self.get_server_id(), resource_id))
r = self.wrapped_state.resource.add()
r.template.CopyFrom(t)
r.resource_id = resource_id
# Calculates the time this resource went out of learning mode.
# Note: This time may be in the past.
r.learning_mode_expiry_time = self.wrapped_state.election_victory_time + \
AlgorithmImpl.create(t, self.wrapped_state.server_level).get_max_lease_duration()
if r.learning_mode_expiry_time > clock.get_time():
logger.info('%s putting resource %s in learning mode until T=%d' %
(self.get_server_id(), resource_id,
r.learning_mode_expiry_time))
# Schedules an action to log a message when this resource leaves
# learning mode.
scheduler.add_absolute(r.learning_mode_expiry_time + 1,
_LeaveLearningMode(),
(self.get_server_id(), r.resource_id))
# Note: At this point this server has not capacity lease for this resource.
# It is up to the caller to deal with this.
assert r.IsInitialized()
return r
def _get_capacity(self):
assert self.is_master()
now = clock.get_time()
# Assume the worst... :-)
success = False
# If we are server level 0, we need to get the capacity from the
# configuration.
if self.server_level == 0:
for resource in self.state.all_resources():
algo = AlgorithmImpl.create(resource.template,
self.server_level)
resource.ClearField('has')
resource.has.CopyFrom(
algo.create_lease(resource, resource.template.capacity))
# Note, we set a refresh interval here even though the capacity we get from the
# configuration lasts forever. However by setting a refresh interval and relatively
# short leases we ensure that configuration changes (e.g. from CDD) are
# picked up.
resource.has.refresh_interval *= 2
success = True
else:
# If this is not the root server it gets its capacity from
# a downstream server.
success = self._get_capacity_downstream()
logger.info('%s resource state after getting capacity:' %
self.server_id)
for resource in self.state.all_resources():
logger.info('resource: %s got: %lf lease: %d refresh: %d' %
(resource.resource_id, resource.has.capacity,
resource.has.expiry_time - now,
resource.has.refresh_interval))
return success
def _get_capacity(self):
assert self.is_master()
now = clock.get_time()
# Assume the worst... :-)
success = False
# If we are server level 0, we need to get the capacity from the
# configuration.
if self.server_level == 0:
for resource in self.state.all_resources():
algo = AlgorithmImpl.create(resource.template, self.server_level)
resource.ClearField('has')
resource.has.CopyFrom(
algo.create_lease(resource, resource.template.capacity))
# Note, we set a refresh interval here even though the capacity we get from the
# configuration lasts forever. However by setting a refresh interval and relatively
# short leases we ensure that configuration changes (e.g. from CDD) are
# picked up.
resource.has.refresh_interval *= 2
success = True
else:
# If this is not the root server it gets its capacity from
# a downstream server.
success = self._get_capacity_downstream()
logger.info('%s resource state after getting capacity:' % self.server_id)
for resource in self.state.all_resources():
logger.info(
'resource: %s got: %lf lease: %d refresh: %d' %
(resource.resource_id, resource.has.capacity,
resource.has.expiry_time - now, resource.has.refresh_interval))
return success
def GetCapacity_RPC(self, request):
assert request.IsInitialized()
assert self.state.is_initialized()
# If this server is not the master it cannot handle this request.
# The client should do a new Discovery.
if not self.is_master():
self.state.assert_clean()
logger.info('%s getting a GetCapacity request when not master' %
self.server_id)
Counter.get('server.GetCapacity_RPC.not_master').inc()
return None
timer = Gauge.get('server.GetCapacity_RPC.latency')
timer.start_timer()
logger.debug(request)
now = clock.get_time()
# Cleanup the state. This removes resources and clients with expired
# leases and such.
self.state.cleanup()
# A set of resources that we need to skip in step 2 (the actual
# handing out of capacity.
resources_to_skip = set()
# First step: Go through the request and update the state with the
# information from the request.
for req in request.resource:
# Finds the resource and the client state for this resource.
(resource,
cr) = self.state.find_client_resource(request.client_id,
req.resource_id)
# If this resource does not exist we don't need to do anything
# right now.
if resource:
assert cr
# Checks whether the last request from this client was at least
# _kMinimumInterval seconds ago.
if cr.HasField(
'last_request_time'
) and now - cr.last_request_time < _kMinimumInterval:
logger.warning(
'%s GetCapacity request for resource %s within the %d second '
'threshold' %
(self.server_id, req.resource_id, _kMinimumInterval))
resources_to_skip.add(req.resource_id)
else:
# Updates the state with the information in the request.
cr.last_request_time = now
cr.priority = req.priority
cr.wants = req.wants
if req.HasField('has'):
cr.has.CopyFrom(req.has)
else:
cr.ClearField('has')
# Creates a new response object in which we will insert the responses for
# the resources contained in the request.
response = GetCapacityResponse()
# Step 2: Loop through all the individual resource requests in the request
# and hand out capacity.
for req in request.resource:
# If this is a resource we need to skip, let's skip it.
if req.resource_id in resources_to_skip:
continue
# Finds the resource and the client state for this resource.
(resource,
cr) = (self.state.find_client_resource(request.client_id,
req.resource_id))
# Adds a response proto to the overall response.
resp = response.response.add()
resp.resource_id = req.resource_id
# If this is an unknown resource just give the client whatever it
# is asking for.
if not resource:
assert not cr
logger.warning(
'%s GetCapacity request for unmanaged resource %s' %
(self.server_id, req.resource_id))
resp.gets.expiry_time = now + _kDefaultLeaseTimeForUnknownResources
resp.gets.capacity = req.wants
else:
# Sets the safe capacity in the response if there is one
# configured for this resource.
if resource.template.HasField('safe_capacity'):
resp.safe_capacity = resource.template.safe_capacity
# Finds the algorithm implementation object for this resource.
algo = AlgorithmImpl.create(resource.template,
self.server_level)
# If the resource is in learning mode we just return whatever the client
# has now and create a default lease.
if resource.learning_mode_expiry_time >= now:
if cr.HasField('has'):
has_now = cr.has.capacity
else:
has_now = 0
cr.has.CopyFrom(algo.create_lease(resource, has_now))
Counter.get('server.learning_mode_response').inc()
else:
# Otherwise we just run the algorithm. This will update the
# client state object.
algo.run_client(resource, cr)
Counter.get('server.algorithm_runs').inc()
# Copies the output from the algorithm run into the response.
resp.gets.CopyFrom(cr.has)
assert resp.IsInitialized()
logger.info(
'%s for %s resource: %s wants: %lf gets: %lf lease: %d refresh: %d'
% (self.server_id, request.client_id, req.resource_id,
req.wants, resp.gets.capacity, resp.gets.expiry_time - now,
resp.gets.refresh_interval))
assert response.IsInitialized()
timer.stop_timer()
return response
def GetCapacity_RPC(self, request):
assert request.IsInitialized()
assert self.state.is_initialized()
# If this server is not the master it cannot handle this request.
# The client should do a new Discovery.
if not self.is_master():
self.state.assert_clean()
logger.info('%s getting a GetCapacity request when not master' %
self.server_id)
Counter.get('server.GetCapacity_RPC.not_master').inc()
return None
timer = Gauge.get('server.GetCapacity_RPC.latency')
timer.start_timer()
logger.debug(request)
now = clock.get_time()
# Cleanup the state. This removes resources and clients with expired
# leases and such.
self.state.cleanup()
# A set of resources that we need to skip in step 2 (the actual
# handing out of capacity.
resources_to_skip = set()
# First step: Go through the request and update the state with the
# information from the request.
for req in request.resource:
# Finds the resource and the client state for this resource.
(resource, cr) = self.state.find_client_resource(
request.client_id,
req.resource_id)
# If this resource does not exist we don't need to do anything
# right now.
if resource:
assert cr
# Checks whether the last request from this client was at least
# _kMinimumInterval seconds ago.
if cr.HasField('last_request_time') and now - cr.last_request_time < _kMinimumInterval:
logger.warning(
'%s GetCapacity request for resource %s within the %d second '
'threshold' %
(self.server_id, req.resource_id, _kMinimumInterval))
resources_to_skip.add(req.resource_id)
else:
# Updates the state with the information in the request.
cr.last_request_time = now
cr.priority = req.priority
cr.wants = req.wants
if req.HasField('has'):
cr.has.CopyFrom(req.has)
else:
cr.ClearField('has')
# Creates a new response object in which we will insert the responses for
# the resources contained in the request.
response = GetCapacityResponse()
# Step 2: Loop through all the individual resource requests in the request
# and hand out capacity.
for req in request.resource:
# If this is a resource we need to skip, let's skip it.
if req.resource_id in resources_to_skip:
continue
# Finds the resource and the client state for this resource.
(resource, cr) = (
self.state.find_client_resource(
request.client_id,
req.resource_id))
# Adds a response proto to the overall response.
resp = response.response.add()
resp.resource_id = req.resource_id
# If this is an unknown resource just give the client whatever it
# is asking for.
if not resource:
assert not cr
logger.warning(
'%s GetCapacity request for unmanaged resource %s' %
(self.server_id, req.resource_id))
resp.gets.expiry_time = now + _kDefaultLeaseTimeForUnknownResources
resp.gets.capacity = req.wants
else:
# Sets the safe capacity in the response if there is one
# configured for this resource.
if resource.template.HasField('safe_capacity'):
resp.safe_capacity = resource.template.safe_capacity
# Finds the algorithm implementation object for this resource.
algo = AlgorithmImpl.create(resource.template, self.server_level)
# If the resource is in learning mode we just return whatever the client
# has now and create a default lease.
if resource.learning_mode_expiry_time >= now:
if cr.HasField('has'):
has_now = cr.has.capacity
else:
has_now = 0
cr.has.CopyFrom(algo.create_lease(resource, has_now))
Counter.get('server.learning_mode_response').inc()
else:
# Otherwise we just run the algorithm. This will update the
# client state object.
algo.run_client(resource, cr)
Counter.get('server.algorithm_runs').inc()
# Copies the output from the algorithm run into the response.
resp.gets.CopyFrom(cr.has)
assert resp.IsInitialized()
logger.info(
'%s for %s resource: %s wants: %lf gets: %lf lease: %d refresh: %d' %
(self.server_id, request.client_id, req.resource_id, req.wants,
resp.gets.capacity, resp.gets.expiry_time - now,
resp.gets.refresh_interval))
assert response.IsInitialized()
timer.stop_timer()
return response
