private static bool IsExpired(CachedDataHolder ent)
{
if (ent == null)
{
return(false);
}
return(DateTime.UtcNow > ent.ExpirationDate.ToUniversalTime());
}
/// <summary>
/// Triggers the parsing of the current user agent
/// </summary>
public void Parse()
{
if (IsParsed())
{
return;
}
parsed = true;
// skip parsing for empty useragents or those not containing any letter
if (string.IsNullOrEmpty(userAgent) || !GetRegexEngine().Match(userAgent, "([a-z])"))
{
return;
}
var useCache = DeviceDetectorSettings.ParseCacheDBExpiration != TimeSpan.Zero;
if (useCache)
{
var key = $"{userAgent}_{skipBotDetection}_{discardBotInformation}_{_versionTruncation}";
var cachedData = col.FindById(key);
if (IsExpired(cachedData))
{
col.Delete(key);
cachedData = null;
}
if (!string.IsNullOrEmpty(cachedData?.Json))
{
var data = JsonConvert.DeserializeObject <DeviceDetectorCachedData>(cachedData.Json, jsonSettings);
device = data.Device;
brand = data.Brand;
parsed = data.Parsed;
model = data.Model;
bot = data.Bot;
client = data.Client;
os = data.Os;
return;
}
ParseBase();
var ent = new DeviceDetectorCachedData()
{
Device = device,
Brand = brand,
Parsed = parsed,
Model = model,
Bot = bot,
Client = client,
Os = os
};
cachedData = new CachedDataHolder()
{
Id = key,
Json = JsonConvert.SerializeObject(ent, jsonSettings),
ExpirationDate = useCache ? DateTime.UtcNow.Add(DeviceDetectorSettings.ParseCacheDBExpiration) : DateTime.MaxValue
};
col.Upsert(cachedData);
}
else
{
ParseBase();
}
}