public DbSyncDateTimeService(ICuriosityDataContextFactory dataContextFactor)
{
if (dataContextFactor == null)
{
throw new ArgumentNullException(nameof(dataContextFactor));
}
_dataContextFactory = dataContextFactor ?? throw new ArgumentNullException(nameof(dataContextFactor));
_timeCorrectionParams = TimeCorrectionParams.ForEqual();
}
/// <summary>
/// Inits service on demand.
/// </summary>
/// <returns></returns>
public async Task InitAsync(CancellationToken cancellationToken = default)
{
// don't consider request time to DB
// we don't need high accuracy
using (var context = _dataContextFactory.CreateContext())
{
var serverTime = await context.GetImmediateServerTimeUtcAsync(cancellationToken);
var localTime = System.DateTime.UtcNow;
if (serverTime > localTime)
{
_timeCorrectionParams = TimeCorrectionParams.ForBigger(serverTime - localTime);
}
else if (serverTime < localTime)
{
_timeCorrectionParams = TimeCorrectionParams.ForSmaller(localTime - serverTime);
}
else
{
_timeCorrectionParams = TimeCorrectionParams.ForEqual();
}
}
}
