def _add_read_only_instances(request, database):
try:
check_is_database_dead(database.id, 'Add read-only instances')
check_is_database_enabled(database.id, 'Add read-only instances')
except DisabledDatabase as err:
messages.add_message(request, messages.ERROR, err.message)
return
if not database.plan.replication_topology.has_horizontal_scalability:
messages.add_message(
request, messages.ERROR,
'Database topology do not have horizontal scalability')
return
if 'add_read_qtd' not in request.POST:
messages.add_message(request, messages.ERROR, 'Quantity is required')
return
max_read_hosts = Configuration.get_by_name_as_int('max_read_hosts', 5)
qtd_new_hosts = int(request.POST['add_read_qtd'])
current_read_nodes = len(database.infra.instances.filter(read_only=True))
total_read_hosts = qtd_new_hosts + current_read_nodes
if total_read_hosts > max_read_hosts:
messages.add_message(
request, messages.ERROR,
'Current limit of read only hosts is {} and you are trying to setup {}'
.format(max_read_hosts, total_read_hosts))
return
TaskRegister.database_add_instances(database=database,
user=request.user,
number_of_instances=qtd_new_hosts)
def execute(self):
self.load_number_of_instances()
if not self.number_of_instances:
raise exceptions.RequiredNumberOfInstances(
'Number of instances is required'
)
status, message = self.check_database_status()
if not status:
raise exceptions.DatabaseNotAvailable(message)
if not self.is_ha():
raise exceptions.DatabaseIsNotHA(
'Database topology do not have horizontal scalability'
)
max_read_hosts = Configuration.get_by_name_as_int('max_read_hosts', 5)
qtd_new_hosts = self.number_of_instances
current_read_nodes = len(self.database.infra.instances.filter(read_only=True))
total_read_hosts = qtd_new_hosts + current_read_nodes
if total_read_hosts > max_read_hosts:
raise exceptions.ReadOnlyHostsLimit(
('Current limit of read only hosts is {} and you are trying '
'to setup {}').format(
max_read_hosts, total_read_hosts
)
)
self.task_params = dict(
database=self.database,
user=self.request.user,
number_of_instances=qtd_new_hosts,
number_of_instances_before_task=self.number_of_instances_before
)
if self.retry:
since_step = self.manager.current_step
self.task_params['since_step'] = since_step
TaskRegister.database_add_instances(**self.task_params)
def _add_read_only_instances(request, database):
try:
check_is_database_dead(database.id, 'Add read-only instances')
check_is_database_enabled(database.id, 'Add read-only instances')
except DisabledDatabase as err:
messages.add_message(request, messages.ERROR, err.message)
return
if not database.plan.replication_topology.has_horizontal_scalability:
messages.add_message(
request, messages.ERROR,
'Database topology do not have horizontal scalability'
)
return
if 'add_read_qtd' not in request.POST:
messages.add_message(request, messages.ERROR, 'Quantity is required')
return
max_read_hosts = Configuration.get_by_name_as_int('max_read_hosts', 5)
qtd_new_hosts = int(request.POST['add_read_qtd'])
current_read_nodes = len(database.infra.instances.filter(read_only=True))
total_read_hosts = qtd_new_hosts + current_read_nodes
if total_read_hosts > max_read_hosts:
messages.add_message(
request, messages.ERROR,
'Current limit of read only hosts is {} and you are trying to setup {}'.format(
max_read_hosts, total_read_hosts
)
)
return
TaskRegister.database_add_instances(
database=database,
user=request.user,
number_of_instances=qtd_new_hosts
)
