def update_tgw_rt()

in functions/source/lambda_function.py [0:0]

• 23 lines of code
• 5 McCabe index (conditional complexity)

def update_tgw_rt(vpn_routes, tgw_rt_id, tgw_attach_id):
    region = os.environ['AWS_REGION']
    ec2 = boto3.client('ec2', region_name=region)
    uniq_vpn_routes = list(set(vpn_routes))
    logger.info("EC2 TGW Route Update {0}".format(uniq_vpn_routes))
    #Checking if the route already exsists, if so skip updating the TGW route table
    for route in uniq_vpn_routes:
        exsisting_route = ec2.search_transit_gateway_routes(
            TransitGatewayRouteTableId= tgw_rt_id,
            Filters=[
                { 'Name': 'route-search.exact-match',
                  'Values': [route]

            }]
        )
        if bool(exsisting_route['Routes']):
            logger.info("Transit Gateway RT: No update, route {0} exsists, skipping update".format(route))
            pass
        else:
            logger.info("Transit Gateway RT: New route, adding route {0}".format(route))
            ec2.create_transit_gateway_route(
            DestinationCidrBlock= route,
            TransitGatewayRouteTableId=tgw_rt_id,
            TransitGatewayAttachmentId=tgw_attach_id
           )