public void Lookup(IPAddress ip, Action <GeoInfo> callback)
{
uint ipInt = Ip4Utils.ToInt(ip);
GeoInfo geoInfo = null;
lock (cache)
{
if (cache.TryGetValue(ipInt, out var cached))
{
geoInfo = cached as GeoInfo;
}
if (geoInfo == null)
{
if (this.usageExceeded == DateTime.UtcNow.Date)
{
return;
}
if (cached == null)
{
cache.Add(ipInt, callback);
this.queue.Add(ip);
}
else
{
var callbacks = (Action <GeoInfo>)cached;
callbacks += callback;
cache[ipInt] = callbacks;
}
return;
}
}
callback(geoInfo);
}
public void Lookup(IPAddress ip, Action <GeoInfo> callback)
{
uint ipInt = Ip4Utils.ToInt(ip);
GeoInfo geoInfo;
lock (cache)
{
object cached;
if (!cache.TryGetValue(ipInt, out cached))
{
cache.Add(ipInt, callback);
this.queue.Add(ip);
return;
}
geoInfo = cached as GeoInfo;
if (geoInfo == null)
{
var callbacks = (Action <GeoInfo>)cached;
callbacks += callback;
cache[ipInt] = callbacks;
return;
}
}
callback(geoInfo);
}
public void LoadCache()
{
if (!File.Exists(this.cacheFile))
{
return;
}
lock (cache)
{
foreach (var line in File.ReadAllLines(this.cacheFile))
{
try
{
var parts = line.Split(new[] { '=' }, 2);
uint ipInt = 0;
var octets = parts[0].Split('.');
foreach (var octet in octets)
{
ipInt = (ipInt << 8) + uint.Parse(octet);
}
var loc = parts[1].Split('|');
var countryCode = loc[0];
var latitude = decimal.Parse(loc[5], NumberFormatInfo.InvariantInfo);
var longitude = decimal.Parse(loc[6], NumberFormatInfo.InvariantInfo);
if (countryCode != "")
{
var geoInfo = new GeoInfo(countryCode, loc[1], loc[2], loc[3], loc[4], latitude, longitude);
cache[ipInt] = geoInfo;
}
}
catch
{
// ignore
}
}
// override wrong geo-IP information (MS Azure IPs list Washington even for NL/EU servers)
cache[Ip4Utils.ToInt(104, 40, 134, 97)] = new GeoInfo("NL", "Netherlands", null, null, null, 0, 0);
cache[Ip4Utils.ToInt(104, 40, 213, 215)] = new GeoInfo("NL", "Netherlands", null, null, null, 0, 0);
// Vultr also spreads their IPs everywhere
cache[Ip4Utils.ToInt(45, 32, 153, 115)] = new GeoInfo("DE", "Germany", null, null, null, 0, 0); // listed as NL, but is DE
cache[Ip4Utils.ToInt(45, 32, 205, 149)] = new GeoInfo("US", "United States", "TX", null, null, 0, 0); // listed as NL, but is TX
// i3d.net
cache[Ip4Utils.ToInt(185, 179, 200, 69)] = new GeoInfo("ZA", "South Africa", null, null, null, 0, 0); // listed as NL, but is ZA
}
}
private void ProcessLoop()
{
using (var client = new XWebClient(5000))
{
while (true)
{
var ip = this.queue.Take();
if (ip == null)
{
break;
}
bool err = true;
var ipInt = Ip4Utils.ToInt(ip);
try
{
var url = string.Format(this.ServiceUrlFormat, ip);
var result = client.DownloadString(url);
if (result != null)
{
object o;
Action <GeoInfo> callbacks;
lock (cache)
callbacks = cache.TryGetValue(ipInt, out o) ? o as Action <GeoInfo> : null;
var geoInfo = this.HandleResult(ipInt, result);
if (callbacks != null && geoInfo != null)
{
ThreadPool.QueueUserWorkItem(ctx => callbacks(geoInfo));
}
err = false;
}
}
catch
{
// ignore
}
if (err)
{
lock (this.cache)
this.cache.Remove(ipInt);
}
}
}
}