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sd.py
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sd.py
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import boto3
import json
import argparse
from texttable import Texttable
sd_client = boto3.client('servicediscovery', region_name='us-east-1')
ecs_client = boto3.client('ecs', region_name='us-east-1')
ec2_resource = boto3.resource('ec2', region_name='us-east-1')
r53_client = boto3.client('route53', region_name='us-east-1')
def main():
parser = argparse.ArgumentParser()
subparsers = parser.add_subparsers()
parser_create = subparsers.add_parser('create')
parser_create.add_argument("--vpc", help="the VPC ID you want to associate with the namespace", required=True)
parser_create.add_argument("--namespace", help="the DNS namespace for the service", required=True)
parser_create.add_argument("--service", help="the name of your service", required=True)
#parser_create.add_argument("--task", help="the task definition family name")
parser_create.set_defaults(func=handler_create)
parser_delete = subparsers.add_parser('delete')
parser_delete.add_argument("--namespace-id", help="the DNS namespace ID")
parser_delete.add_argument("--service-id", help="the ID of the service")
parser_delete.set_defaults(func=handler_delete)
parser_describe = subparsers.add_parser('describe')
parser_describe.add_argument("--namespace-id", help="the DNS namespace ID")
parser_describe.set_defaults(func=handler_describe)
parser_list = subparsers.add_parser('list')
parser_list.add_argument("--namespaces", action='store_true')
parser_list.add_argument("--services", action='store_true')
parser_list.set_defaults(func=handler_list)
args = parser.parse_args()
args.func(args)
def handler_create(args):
vpc_id = args.vpc
service_name = args.service
#task_name = args.task
namespace_name = args.namespace
validate_vpcid(vpc_id)
#validate_task_name(task_name)
namespace_id = create_namespace(namespace_name, vpc_id)
service = create_service(service_name, namespace_id)
header = ['Namespace-Id', 'Service-Id', 'Service-Arn']
values = [[namespace_id, service['Id'], service['Arn']]]
print print_table(header, values)
# print json.dumps(sd_client.list_services().pop('Services'), indent=4)
# create_ecs_service(service_name, service['Arn'], task_name)
def handler_delete(args):
service_id = args.service_id
namespace_id = args.namespace_id
if service_id != None:
delete_service(service_id)
if namespace_id != None:
delete_namespace(namespace_id)
def handler_describe(args):
namespace_id = args.namespace_id
zone_id = get_zone_id(namespace_id)
print json.dumps(list_resource_records(zone_id), indent=4)
def handler_list(args):
namespaces = args.namespaces
services = args.services
if namespaces:
get_namespaces()
if services:
get_services()
def get_zone_id(namespace_id):
try:
zone_id = sd_client.get_namespace(Id=namespace_id)['Namespace']['Properties']['DnsProperties']['HostedZoneId']
except Exception as e:
print e
return zone_id
def delete_service(service_id):
try:
sd_client.delete_service(Id=service_id)
except Exception as e:
print e
exit()
def delete_namespace(namespace_id):
try:
sd_client.delete_namespace(Id=namespace_id)
except Exception as e:
print e
exit()
def validate_vpcid(vpcid):
try:
vpc = ec2_resource.Vpc(vpcid)
vpc.load()
except Exception as e:
print "VPC %s could not be found" % vpcid
exit()
return True
def validate_task_name(task_name):
try:
ecs_client.describe_task_definition(taskDefinition=task_name)
except Exception as e:
print "Task %s could not be found" % task_name
exit()
return True
def create_task_definition():
# Register a FARGATE task definition
ecs_client.register_task_definition(
family='first-run-task-definition',
networkMode='awsvpc',
containerDefinitions=[
{
"name": "sample-app",
"image": "httpd:2.4",
"portMappings": [
{
"containerPort": 80,
"hostPort": 80,
"protocol": "tcp"
}
],
"essential": True,
"entryPoint": [
"sh",
"-c"
],
"command": [
"/bin/sh -c \"echo '<html> <head> <title>Amazon ECS Sample App</title> <style>body {margin-top: 40px; background-color: #333;} </style> </head><body> <div style=color:white;text-align:center> <h1>Amazon ECS Sample App</h1> <h2>Congratulations!</h2> <p>Your application is now running on a container in Amazon ECS.</p> </div></body></html>' > /usr/local/apache2/htdocs/index.html && httpd-foreground\""
]
},
],
requiresCompatibilities=[
'FARGATE',
],
cpu='256',
memory='512'
)
def create_ecs_service(service_name, service_arn, task_name):
# Create a service using the service discovery service name
ecs_client.create_service(
#TODO create cluster if 'Fargate' cluster doesn't exist
cluster='fargate',
serviceName=service_name + '-svc',
taskDefinition=task_name,
serviceRegistries=[
{
'registryArn': service_arn
}
],
desiredCount=1,
platformVersion='1.1.0',
launchType='FARGATE',
networkConfiguration={
'awsvpcConfiguration': {
'subnets': [
'subnet-f8bc52a2',
],
'securityGroups': [
'sg-592a062c',
],
'assignPublicIp': 'ENABLED'
}
}
)
def create_namespace(namespace_name, vpc_id):
'''Create DNS namespace for service'''
namespaces = sd_client.list_namespaces()['Namespaces']
#filter(lambda x: x['Name'] == namespace_name, namespaces):
for name in namespaces:
if namespace_name == name['Name']:
return name['Id']
operation_id = sd_client.create_private_dns_namespace(Name=namespace_name, Vpc=vpc_id)['OperationId']
namespace_id = sd_client.get_operation(OperationId=operation_id)['Operation']['Targets']['NAMESPACE']
while True:
#TODO handle when status equals FAIL
#print sd_client.get_operation(OperationId=operation_id)
if sd_client.get_operation(OperationId=operation_id)['Operation']['Status'] == 'SUCCESS':
break
return namespace_id
def create_service(service_name, namespace_id):
'''Create service registry name and save Arn'''
response = sd_client.create_service(Name=service_name, DnsConfig={
'NamespaceId': namespace_id,
'DnsRecords': [
{
'Type': 'A',
'TTL': 300
}
]
},
HealthCheckCustomConfig={
'FailureThreshold': 1
}
)
service = {
'Arn': response['Service']['Arn'],
'Id': response['Service']['Id']
}
return service
def list_resource_records(zone_id):
response = r53_client.list_resource_record_sets(HostedZoneId=zone_id).pop('ResourceRecordSets')
return response
def get_namespaces():
namespaces = sd_client.list_namespaces()['Namespaces']
namespace_keys = list(namespaces[0].viewkeys())
namespace_values = []
for name in namespaces:
namespace_values.append(list(name.viewvalues()))
print print_table(namespace_keys, namespace_values)
def get_services():
services = sd_client.list_services()['Services']
service_keys = list(services[0].viewkeys())
service_values = []
for service in services:
service_values.append(list(service.viewvalues()))
print print_table(service_keys, service_values)
def print_table(header, rows):
table = Texttable()
table.header(header)
table.add_rows(rows, header=False)
return table.draw() + "\n"
main()