ec2c = boto3.client('ec2')

api = chef.autoconfigure()

chef_nodes = {}

aws_is_running = []

nodes_to_remove = []

#Array of running ec2 instances - ip addresses

for region in ec2c.describe_regions()['Regions']:

ec2 = boto3.resource('ec2', region_name=region['RegionName'])

for instance in ec2.instances.filter(Filters=[{'Name': 'instance-state-name', 'Values': ['running']}]):

#print('Debug EC2 Instances: ', region['RegionName'], instance.private_ip_address)

aws_is_running.append(instance.private_ip_address)

#Dictionary of ip addresses (key) and Node objects (value) from Chef

for name, nodeobj in Node.list().iteritems() :

for key, value in nodeobj.attributes.iteritems():

if key == 'ipaddress' :

#print('Debug Chef Nodes: ', value, nodeobj)

chef_nodes.update({value : nodeobj})

#Calculating nodes to remove

for key, node in chef_nodes.iteritems():

if key not in aws_is_running:

nodes_to_remove.append(node)

#Removing nodes in Chef that are no longer in AWS

for node in nodes_to_remove:

#print('Debug Nodes to Remove:', node['ipaddress'])

node.delete()

#So that the removed nodes are logged

print 'Removed', [x['ipaddress'] for x in nodes_to_remove]

return 'Removed', [x['ipaddress'] for x in nodes_to_remove]