private void CheckResponse(HttpResponseMessage response)
{
// Some pages redirect to https://www.google.com/sorry instead of return 429
if (response.RequestMessage.RequestUri.Host.EndsWith(".google.com", StringComparison.OrdinalIgnoreCase) &&
response.RequestMessage.RequestUri.LocalPath.StartsWith("/sorry/", StringComparison.OrdinalIgnoreCase))
{
throw RequestLimitExceededException.FailedHttpRequest(response);
}
var statusCode = (int)response.StatusCode;
if (statusCode >= 500)
{
throw TransientFailureException.FailedHttpRequest(response);
}
if (statusCode == 429)
{
throw RequestLimitExceededException.FailedHttpRequest(response);
}
if (statusCode >= 400)
{
throw FatalFailureException.FailedHttpRequest(response);
}
}
private static int GetRetryCost(this Exception ex)
{
return(ex switch
{
TransientFailureException _ => 1,
RequestLimitExceededException _ => 2,
FatalFailureException _ => 3,
_ => 100
});
public static async Task <ChannelPage> GetByUserNameAsync(YoutubeHttpClient httpClient, string userName) =>
await Retry.WrapAsync(async() =>
{
var url = $"https://www.youtube.com/user/{userName}?hl=en";
var raw = await httpClient.GetStringAsync(url);
var result = Parse(raw);
if (!result.IsOk())
{
throw TransientFailureException.Generic("Channel page is broken.");
}
return(result);
});
