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ecs.py
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ecs.py
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import time
import boto3
from typing import List
from .task_builder import TaskDefinitionBuilder
class ECS:
def __init__(self, config=None):
"""Default Variables"""
self.client = boto3.client('ecs')
self.next_version = 0
self.current_service = ''
self.new_task = ''
self.old_service = ''
self.new_service = ''
self.config = config
def get_service_list(self, stage: str) -> None:
try:
response = self.client.list_services(
cluster=self.config.BASE['cluster'],
maxResults=10
)['serviceArns']
except Exception as e:
print(e)
raise Exception('get_service_list() error')
if stage == 'first':
temp = response[0].split('service/{}'.format(self.config.BASE['version_prefix']))
self.next_version = int(temp[1]) + 1
self.current_service = response[0]
elif stage == 'second':
self.describe_service(response)
else:
raise Exception('Invalid stage')
print("[*] Get Service List Done")
def describe_service(self, service_list: dict) -> None:
try:
desc_response = self.client.describe_services(
cluster=self.config.BASE['cluster'],
services=service_list
)
if desc_response['services'][0]['createdAt'] < desc_response['services'][1]['createdAt']:
self.old_service = desc_response['services'][0]['serviceName']
self.new_service = desc_response['services'][1]['serviceName']
else:
self.old_service = desc_response['services'][1]['serviceName']
self.new_service = desc_response['services'][0]['serviceName']
except Exception as e:
print(e)
raise Exception('describe_service() error')
def delete_service(self) -> None:
try:
self.client.delete_service(
cluster=self.config.BASE['cluster'],
service=self.old_service,
force=True
)
print("[*] Delete Service : {}".format(self.old_service))
except Exception as e:
print(e)
raise Exception('delete_service() error')
def create_service(self, task_definition: str) -> None:
try:
self.client.create_service(
cluster=self.config.BASE['cluster'],
serviceName=self.config.BASE['version_prefix'] + str(self.next_version),
taskDefinition=task_definition,
loadBalancers=[
{
'targetGroupArn': self.config.BASE['alb_target_group'],
'containerName': self.config.NGINX['name'],
'containerPort': self.config.NGINX['port']
},
],
desiredCount=2,
launchType='EC2',
role=self.config.BASE['ecs_service_role'],
deploymentConfiguration={
'maximumPercent': self.config.BASE['service_maximum_percent'],
'minimumHealthyPercent': self.config.BASE['service_minimum_healthy_percent']
},
placementStrategy=[
{
'type': 'spread',
'field': 'attribute:ecs.availability-zone'
},
{
'type': 'spread',
'field': 'instanceId'
}
],
healthCheckGracePeriodSeconds=0,
schedulingStrategy='REPLICA',
enableECSManagedTags=False,
)
print("[*] Create Service Done")
except Exception as e:
print(e)
raise Exception('create_service() error')
def update_service(self, count: int, target_service: str, task_definition: str) -> None:
try:
self.client.update_service(
cluster=self.config.BASE['cluster'],
service=target_service,
desiredCount=count,
taskDefinition=task_definition,
deploymentConfiguration={
'maximumPercent': self.config.BASE['service_maximum_percent'],
'minimumHealthyPercent': self.config.BASE['service_minimum_healthy_percent']
},
)
print("[*] Update Service Done")
except Exception as e:
print(e)
raise Exception('update_service() error')
def stop_task(self, task_id: str) -> None:
try:
self.client.stop_task(
cluster=self.config.BASE['cluster'],
task=task_id,
reason='For update'
)
print("[*] Stop Task : {}".format(task_id))
except Exception as e:
print(e)
raise Exception('stop_task() error')
def get_task_definition_list(self) -> dict:
try:
response = self.client.list_task_definitions(
familyPrefix=self.config.BASE['task_family'],
status='ACTIVE',
sort='DESC',
maxResults=10
)
print("[*] Get Task Definition List Done")
return response
except Exception as e:
print(e)
raise Exception('get_task_definition_list() error')
def get_task_list(self, service_name: str) -> List[str]:
try:
response = self.client.list_tasks(
cluster=self.config.BASE['cluster'],
serviceName=service_name
)['taskArns']
print("[*] Get Task List Done")
return response
except Exception as e:
print(e)
raise Exception('get_task_list() error')
def register_task_definition(self, combined_task_definition: List) -> str:
try:
response = self.client.register_task_definition(
family=self.config.BASE['task_family'],
containerDefinitions=combined_task_definition,
requiresCompatibilities=[
'EC2',
]
)
print("[*] Register Task Definition : {}:{}".format(
self.config.BASE['task_family'], response['taskDefinition']['revision']))
return response['taskDefinition']['taskDefinitionArn']
except Exception as e:
print(e)
raise Exception('register_task_definition() error')
def run_first_stage(self) -> None:
print("[*] First Stage Start")
"""서비스 목록"""
self.get_service_list(stage='first')
task_list = self.get_task_list(service_name=self.current_service)
"""기존 서비스에서 작업 2개 정지"""
self.stop_task(task_id=task_list[0])
self.stop_task(task_id=task_list[1])
"""기존 작업정의 가져오기"""
new_task_definition = self.get_task_definition_list()['taskDefinitionArns'][0]
"""기존 작업정의를 바탕으로 서비스 업데이트(작업 개수 2개로 축소)"""
self.update_service(
count=self.config.BASE['decrease_instance_count'],
target_service=self.current_service,
task_definition=new_task_definition
)
"""딜레이"""
print("[*] Wait 10sec")
time.sleep(10)
"""새로운 작업정의 생성"""
web_obj = TaskDefinitionBuilder(self.config.WEB).make()
nginx_obj = TaskDefinitionBuilder(self.config.NGINX).make()
new_task_definition = self.register_task_definition(combined_task_definition=[web_obj, nginx_obj])
"""새로운 작업정의를 바탕으로 서비스 생성(작업 개수 2개)"""
self.create_service(task_definition=new_task_definition)
print("[*] Finish")
def run_second_stage(self) -> None:
print("[*] Second Stage Start")
"""이전 버전 서비스 가져오기"""
self.get_service_list(stage='second')
"""이전 서비스 작업 가져오기"""
task_list = self.get_task_list(service_name=self.old_service)
"""이전 서비스 작업 중단하기"""
self.stop_task(task_id=task_list[0])
self.stop_task(task_id=task_list[1])
"""이전 서비스 삭제하기"""
self.delete_service()
print("[*] Wait 5sec")
time.sleep(5)
"""작업정의 가져오기"""
new_task_definition = self.get_task_definition_list()['taskDefinitionArns'][0]
"""새로운 서비스 업데이트(작업 개수 4개로 증가)"""
self.update_service(
count=self.config.BASE['increase_instance_count'],
target_service=self.new_service,
task_definition=new_task_definition
)
print("[*] Finish")