39 lines
971 B
Python
39 lines
971 B
Python
"""
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To use this function in lambda, one needs to upload netaddr and this code as a package. here is how
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pip3 install netaddr -t ./
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zip -r ../acrolinxNextSubnet.zip .
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"""
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from netaddr import *
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import boto3
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import cfnresponse
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import json
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import os
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def lambda_handler(event, context):
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my_vpc = {
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'eu-west-1': 'vpc-55a5a930',
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'us-west-2': 'vpc-7155ca14'
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}
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session = boto3.session.Session()
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my_region = session.region_name
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ec2 = session.resource('ec2')
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vpc = ec2.Vpc(my_vpc[my_region])
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subnets = []
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for subnet in vpc.subnets.all():
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subnets.append(IPNetwork(subnet.cidr_block))
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lastSubnet = sorted(subnets).pop()
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nextSubnet = str(lastSubnet.next())
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return {
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'region': my_region,
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'body': json.dumps(nextSubnet)
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}
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# response_data = {}
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# response_data = {"cidr": nextSubnet}
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# my_data = nextSubnet
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# cfnresponse.send(event,context,cfnresponse.SUCCESS, response_data, my_data)
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