private IEnumerable <string> GetItems(string key)
{
if (null == _availableKeys)
{
_availableKeys = EC2InstanceMetadata.GetItems(_path);
}
if (_availableKeys.Contains(key))
{
return(EC2InstanceMetadata.GetItems(_path + key));
}
else
{
return(new List <string>());
}
}
private string GetData(string key)
{
if (_data.ContainsKey(key))
{
return(_data[key]);
}
// Since the keys are variable, cache a list of which ones are available
// to prevent unnecessary trips to the service.
if (null == _availableKeys)
{
_availableKeys = EC2InstanceMetadata.GetItems(_path);
}
if (_availableKeys.Contains(key))
{
_data[key] = EC2InstanceMetadata.GetData(_path + key);
return(_data[key]);
}
else
{
return(null);
}
}
/// <summary>
/// Get the private IPv4 address(es) that are associated with the public-ip address and assigned to that interface.
/// </summary>
/// <param name="publicIp">The public IP address</param>
/// <returns>Private IPv4 address(es) associated with the public IP address</returns>
public IEnumerable <string> GetIpV4Association(string publicIp)
{
return(EC2InstanceMetadata.GetItems(string.Format(CultureInfo.InvariantCulture, "{0}ipv4-associations/{1}", _path, publicIp)));
}