public IPAddress[] ResolveHost()
{
var entry = m_Entry;
if (entry == null || entry.Expired)
{
entry = m_Entry = GetEntry(Host);
}
return((entry == null) ? EmptyAddresses :
(entry.IPAddresses ?? EmptyAddresses));
}
private static RedisIPAddressEntry GetEntry(string host)
{
if (!host.IsEmpty())
{
RedisIPAddressEntry entry;
if (!s_DnsEntries.TryGetValue(host, out entry) || entry.Expired)
{
lock (s_DnsEntries)
{
if (!s_DnsEntries.TryGetValue(host, out entry) || entry.Expired)
{
var isIp = false;
IPAddress[] ipAddresses = null;
if (host.Equals(RedisConstants.LocalHost, StringComparison.OrdinalIgnoreCase))
{
if (RedisSocket.OSSupportsIPv4)
{
isIp = true;
ipAddresses = new[] { IPAddress.Parse(RedisConstants.IP4Loopback) };
}
else if (RedisSocket.OSSupportsIPv6)
{
isIp = true;
ipAddresses = new[] { IPAddress.Parse(RedisConstants.IP6Loopback) };
}
}
if (!isIp)
{
IPAddress ipAddress;
isIp = IPAddress.TryParse(host, out ipAddress);
ipAddresses = isIp ? new[] { ipAddress } :
RedisAsyncEx.GetHostAddressesAsync(host).Result;
if (!ipAddresses.IsEmpty())
{
isIp = isIp ||
ipAddresses.All(ip => IPAddress.IsLoopback(ip) || LocalIPs.Contains(ip));
if (ipAddresses.Length > 1)
{
ipAddresses = ipAddresses
.OrderBy((addr) =>
{ return(addr.AddressFamily == AddressFamily.InterNetwork ? -1 : 1); })
.ToArray();
}
}
}
if (entry != null)
{
entry.SetIPAddresses(ipAddresses, isIp);
}
else
{
s_DnsEntries[host] = entry = new RedisIPAddressEntry(host, ipAddresses, isIp);
}
}
}
}
return(entry);
}
return(null);
}
