/// <summary>
/// Updates the arp item.
/// </summary>
/// <param name="physicalAddress">The physical address.</param>
/// <param name="ipAddress">The ip address.</param>
/// <param name="timestamp">The timestamp.</param>
/// <returns>ArpItem.</returns>
/// <autogeneratedoc />
// ReSharper disable once UnusedMethodReturnValue.Local
private ArpItem _UpdateArpItem(PhysicalAddress physicalAddress, IPAddress ipAddress, DateTimeOffset timestamp)
{
lock (_updateLock)
{
if (_physical2ArpItem.TryGetValue(physicalAddress, out var arpItem))
{
// Update IP Address
if (!arpItem.IPAddress.Equals(ipAddress))
{
// Remove old entry and add new
_ipAddress2ArpItem.Remove(arpItem.IPAddress);
arpItem.IPAddress = ipAddress;
_ipAddress2ArpItem.Add(ipAddress, arpItem);
}
// Update cache value based on this session
arpItem.CreatedTimestamp = timestamp;
}
else
{
// Create new entry
arpItem = new ArpItem(physicalAddress, ipAddress, timestamp);
// Add to both Dictionaries
_physical2ArpItem.Add(physicalAddress, arpItem);
_ipAddress2ArpItem.Add(ipAddress, arpItem);
}
return(arpItem);
}
}
/// <summary>
/// get arp item as an asynchronous operation.
/// </summary>
/// <param name="ipAddress">The ip address.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task<ArpItem>.</returns>
/// <autogeneratedoc />
public async Task <ArpItem> GetArpItemAsync(IPAddress ipAddress, CancellationToken cancellationToken)
{
ArpItem arpItem = null;
// TODO: Rename to be Sync
try
{
lock (_updateLock)
{
if (_ipAddress2ArpItem.TryGetValue(ipAddress, out arpItem))
{
return(arpItem);
}
}
cancellationToken.ThrowIfCancellationRequested();
// OK if ping fails or times out at it will still populate the arp cache
await _pingService.PingIpAddressAsync(ipAddress);
cancellationToken.ThrowIfCancellationRequested();
await RefreshInternalAsync(Timeout, cancellationToken);
cancellationToken.ThrowIfCancellationRequested();
lock (_updateLock)
{
_ipAddress2ArpItem.TryGetValue(ipAddress, out arpItem);
}
}
catch (OperationCanceledException ex)
{
Logger.LogDebug(ex, "GetArpItemAsync task cancelled");
}
return(arpItem);
}
