public async Task <long> GetTimestampAsync(IKucoinHttpClient client, CancellationToken token = default)
{
Throw.IfNull(client, nameof(client));
// Acquire synchronization lock.
await _syncLock.WaitAsync(token)
.ConfigureAwait(false);
try
{
if (DateTime.UtcNow - _offsetLastUpdate > TimeSpan.FromMinutes(client.Options.TimestampOffsetRefreshPeriodMinutes))
{
const long n = 3;
long sum = 0;
var count = n;
do
{
var systemTime = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
var json = await client.GetServerTimeAsync(token)
.ConfigureAwait(false);
systemTime = (systemTime + DateTimeOffset.UtcNow.ToUnixTimeMilliseconds()) / 2;
// Calculate timestamp offset to account for time differences.
sum += JObject.Parse(json)["serverTime"].Value <long>() - systemTime;
} while (--count > 0);
// Calculate average offset.
TimestampOffset = sum / n;
// Record the current system time to determine when to refresh offset.
_offsetLastUpdate = DateTime.UtcNow;
}
}
catch (Exception) { /* ignore */ }
finally
{
// Release synchronization lock.
_syncLock.Release();
}
return(DateTimeOffset.UtcNow.ToUnixTimeMilliseconds() + TimestampOffset);
}