Exemplo n.º 1
0
        /// <summary>
        /// Calculates all possible subnets in the (address block + cidr) and returns one not being used at the moment.
        /// </summary>
        private async Task <string> InternalGetRange(string addressBlock, byte cidr, string tableName, string vpcName)
        {
            if (cidr < 16 || cidr > 28)
            {
                throw new ArgumentOutOfRangeException(nameof(cidr), "Cidr must be between /16 and /28");
            }

            var network = IPNetwork.Parse(addressBlock);
            var subnets = network.Subnet(cidr);
            var numberOfPossibleSubnets = (int)subnets.Count;

            IPNetwork    validSubnet  = null;
            NetworkRange networkRange = null;
            var          count        = 0;

            var storedRanges = await GetRangesForVpc(vpcName, tableName);

            do
            {
                count++;
                var possibleSubnet = subnets[_random.Next(numberOfPossibleSubnets)];

                networkRange = new NetworkRange
                {
                    AddressRange = possibleSubnet.ToString(),
                    VpcName      = vpcName
                };

                if (CanUseRange(storedRanges, possibleSubnet))
                {
                    validSubnet = possibleSubnet;
                }
            } while (validSubnet == null && count < numberOfPossibleSubnets);

            if (validSubnet == null)
            {
                throw new Exception("No available ranges for this address block");
            }

            await _context.SaveAsync(networkRange, new DynamoDBOperationConfig { OverrideTableName = tableName });

            return(networkRange.AddressRange);
        }
Exemplo n.º 2
0
 public bool Equals(NetworkRange other) => other != null && AddressRange == other.AddressRange && VpcName == other.VpcName;