def __init__(self, environment):
self.environment = environment
environment_configuration = EnvironmentConfiguration(
self.environment
)
environment_configuration.update_config()
self.configuration = environment_configuration.get_config()[self.environment]
self.cluster_name = get_cluster_name(environment)
self.client = get_client_for('cloudformation', self.environment)
class EnvironmentCreator(object):
def __init__(self, environment):
self.environment = environment
self.environment_configuration = EnvironmentConfiguration(
self.environment)
self.environment_configuration.update_config()
self.configuration = self.environment_configuration.get_config()[
self.environment]
self.cluster_name = get_cluster_name(environment)
self.client = get_client_for('cloudformation', self.environment)
self.key_name = self.configuration['cluster']['key_name']
def run(self):
try:
log("Check if stack already exists for " + self.cluster_name)
environment_stack = self.client.describe_stacks(
StackName=self.cluster_name)['Stacks'][0]
log(self.cluster_name + " stack exists. ID: " +
environment_stack['StackId'])
log_err("Cannot create environment with duplicate name: " +
self.cluster_name)
except Exception:
log(self.cluster_name +
" stack does not exist. Creating new stack.")
# When creating a cluster, desired_instance count is same
# as min_instance count
environment_stack_template_body = ClusterTemplateGenerator(
self.environment, self.configuration).generate_cluster()
self.existing_events = get_stack_events(self.client,
self.cluster_name)
environment_stack = self.client.create_stack(
StackName=self.cluster_name,
TemplateBody=environment_stack_template_body,
Parameters=[{
'ParameterKey': 'KeyPair',
'ParameterValue': self.key_name,
}, {
'ParameterKey': 'Environment',
'ParameterValue': self.environment,
}],
OnFailure='DO_NOTHING',
Capabilities=['CAPABILITY_NAMED_IAM'],
)
log_bold("Submitted to cloudformation. Checking progress...")
self.__print_progress()
log_bold(self.cluster_name + " stack created. ID: " +
environment_stack['StackId'])
def run_update(self, update_ecs_agents):
if update_ecs_agents:
self.__run_ecs_container_agent_udpate()
try:
log("Initiating environment stack update.")
# self.environment_configuration.update_cloudlift_version()
environment_stack_template_body = ClusterTemplateGenerator(
self.environment, self.configuration,
self.__get_desired_count()).generate_cluster()
log("Template generation complete.")
change_set = create_change_set(self.client,
environment_stack_template_body,
"TemplateBody", self.cluster_name,
self.key_name, self.environment)
self.existing_events = get_stack_events(self.client,
self.cluster_name)
log_bold("Executing changeset. Checking progress...")
if change_set is None:
return
self.client.execute_change_set(
ChangeSetName=change_set['ChangeSetId'])
self.__print_progress()
except ClientError as e:
log_err("No updates are to be performed")
except Exception as e:
raise e
# log_err("Something went wrong")
# TODO: Describe error here.
def __get_desired_count(self):
try:
auto_scaling_client = get_client_for('autoscaling',
self.environment)
cloudformation_client = get_client_for('cloudformation',
self.environment)
cfn_resources = cloudformation_client.list_stack_resources(
StackName=self.cluster_name)
auto_scaling_group_name = list(
filter(
lambda x: x['ResourceType'
] == "AWS::AutoScaling::AutoScalingGroup",
cfn_resources['StackResourceSummaries'])
)[0]['PhysicalResourceId']
response = auto_scaling_client.describe_auto_scaling_groups(
AutoScalingGroupNames=[auto_scaling_group_name])
return response['AutoScalingGroups'][0]['DesiredCapacity']
except Exception as err:
raise err
raise UnrecoverableException(
"Unable to fetch desired instance count. {}".format(err))
def __print_progress(self):
while True:
response = self.client.describe_stacks(StackName=self.cluster_name)
if "IN_PROGRESS" not in response['Stacks'][0]['StackStatus']:
break
all_events = get_stack_events(self.client, self.cluster_name)
print_new_events(all_events, self.existing_events)
self.existing_events = all_events
sleep(5)
log_bold("Finished and Status: %s" %
(response['Stacks'][0]['StackStatus']))
def __run_ecs_container_agent_udpate(self):
log("Initiating agent update")
ecs_client = get_client_for('ecs', self.environment)
response = ecs_client.list_container_instances(
cluster=self.cluster_name)
container_instance_arns = response['containerInstanceArns']
for container_instance_arn in response['containerInstanceArns']:
try:
response = ecs_client.update_container_agent(
cluster=self.cluster_name,
containerInstance=container_instance_arn)
except ClientError as exception:
if "There is no update available for your container agent." in str(
exception):
log("There is no update available for your container agent "
+ container_instance_arn)
elif "Agent update is already in progress." in str(exception):
log("Agent update is already in progress " +
container_instance_arn)
else:
raise exception
while True:
sleep(1)
response = ecs_client.describe_container_instances(
cluster=self.cluster_name,
containerInstances=container_instance_arns)
update_statuses = map(
lambda x: {
"arn": x['containerInstanceArn'],
"status": x.get('agentUpdateStatus', 'UPDATED')
}, response['containerInstances'])
finished = True
status_string = '\r'
for status in update_statuses:
status_string += status['arn'] + ":\033[92m" + \
status['status'] + " \033[0m"
if status['status'] != 'UPDATED':
finished = False
sys.stdout.write(status_string)
sys.stdout.flush()
if finished:
print("")
break