private static async Task <Stream> GetResponseStreamAsync(string symbol, DateTime?startTime, DateTime?endTime, Period period, string events, CancellationToken token)
{
bool reset = false;
while (true)
{
try
{
var(client, crumb) = await YahooClientFactory.GetClientAndCrumbAsync(reset, token).ConfigureAwait(false);
return(await _GetResponseStreamAsync(client, crumb, token).ConfigureAwait(false));
}
catch (FlurlHttpException ex) when(ex.Call.Response?.StatusCode == (int)HttpStatusCode.NotFound)
{
throw new Exception($"Invalid ticker or endpoint for symbol '{symbol}'.", ex);
}
catch (FlurlHttpException ex) when(ex.Call.Response?.StatusCode == (int)HttpStatusCode.Unauthorized)
{
Debug.WriteLine("GetResponseStreamAsync: Unauthorized.");
if (reset)
{
throw;
}
reset = true; // try again with a new client
}
}
#region Local Functions
Task <Stream> _GetResponseStreamAsync(IFlurlClient?_client, string?_crumb, CancellationToken _token)
{
// Yahoo expects dates to be "Eastern Standard Time"
startTime = startTime?.FromEstToUtc() ?? new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
endTime = endTime? .FromEstToUtc() ?? DateTime.UtcNow;
var url = "https://query1.finance.yahoo.com/v7/finance/download"
.AppendPathSegment(symbol)
.SetQueryParam("period1", startTime.Value.ToUnixTimestamp())
.SetQueryParam("period2", endTime.Value.ToUnixTimestamp())
.SetQueryParam("interval", $"1{period.Name()}")
.SetQueryParam("events", events)
.SetQueryParam("crumb", _crumb);
Debug.WriteLine(url);
return(url
.WithClient(_client)
.GetAsync(_token)
.ReceiveStream());
}
#endregion
}
static async Task <Stream> GetResponseStreamAsync(string symbol, DateTime?startTime, DateTime?endTime, Period period, string events, CancellationToken token)
{
var(client, crumb) = await _GetClientAndCrumbAsync();
try
{
return(await _GetResponseStreamAsync(client, crumb).ConfigureAwait(false));
}
catch (FlurlHttpException ex) when(ex.Call.Response?.StatusCode == HttpStatusCode.Unauthorized)
{
YahooClientFactory.Reset();
(client, crumb) = await _GetClientAndCrumbAsync().ConfigureAwait(false);
return(await _GetResponseStreamAsync(client, crumb).ConfigureAwait(false));
}
catch (FlurlHttpException ex) when(ex.Call.Response?.StatusCode == HttpStatusCode.NotFound)
{
throw new Exception("You may have used an invalid ticker, or the endpoint is invalidated", ex);
}
#region Local Functions
async Task <(IFlurlClient, string)> _GetClientAndCrumbAsync()
{
var _client = await YahooClientFactory.GetClientAsync().ConfigureAwait(false);
var _crumb = await YahooClientFactory.GetCrumbAsync().ConfigureAwait(false);
return(_client, _crumb);
}
Task <Stream> _GetResponseStreamAsync(IFlurlClient _client, string _crumb)
{
var url = QueryUrl
.AppendPathSegment(symbol)
.SetQueryParam(Period1Tag, (startTime ?? new DateTime(1970, 1, 1)).ToUnixTimestamp())
.SetQueryParam(Period2Tag, (endTime ?? DateTime.Now).ToUnixTimestamp())
.SetQueryParam(IntervalTag, $"1{period.Name()}")
.SetQueryParam(EventsTag, events)
.SetQueryParam(CrumbTag, _crumb);
//Debug.WriteLine(url);
return(url
.WithClient(_client)
.GetAsync(token)
.ReceiveStream());
}
#endregion
}
