public static async Task <string> GetResponseTextByProxyAsync(Uri uri, IWebProxySelector proxySelector, Func <Uri, IWebProxy, Task <string> > rspTextFetcher, byte retryTimes = 9)
{
string rspText = null;
if (retryTimes < 4)
{
retryTimes = 4;
}
bool isSuccessfulByNormalProxies = false;
for (byte i = 0; i < retryTimes - 1; i++)
{
var proxy = proxySelector.SelectNextProxy();
rspText = await rspTextFetcher.Invoke(uri, proxy);
if (!string.IsNullOrEmpty(rspText))
{
isSuccessfulByNormalProxies = true;
proxySelector.OnNormalProxySuccess(proxy);
break;
}
proxySelector.OnNormalProxyFail(proxy);
}
if (!isSuccessfulByNormalProxies)
{
for (byte i = 0; i < 2; i++)
{
bool isAdvancedProxy = proxySelector.TryPreferAdvancedProxy(out var proxy);
rspText = await rspTextFetcher.Invoke(uri, proxy);
if (!string.IsNullOrEmpty(rspText))
{
if (isAdvancedProxy)
{
proxySelector.OnAdvancedProxySuccess(proxy);
}
else
{
proxySelector.OnNormalProxySuccess(proxy);
}
break;
}
if (isAdvancedProxy)
{
proxySelector.OnAdvancedProxyFail(proxy);
}
else
{
proxySelector.OnNormalProxyFail(proxy);
}
}
}
return(rspText);
}
public static async Task <string> GetResponseTextByProxyAsync(Uri uri, IWebProxySelector proxySelector, Func <Uri, IWebProxy, Task <HttpResponseMessage> > rspFetcher, Predicate <string> rspValidator = null, byte retryTimes = 9)
{
string rspText = null;
if (retryTimes < 4)
{
retryTimes = 4;
}
bool isSuccessfulByNormalProxies = false;
for (byte i = 0; i < retryTimes - 1; i++)
{
var proxy = proxySelector.SelectNextProxy();
rspText = await GetResponseTextByProxyAsync(uri, rspFetcher, proxy, rspValidator);
if (rspText != null)
{
isSuccessfulByNormalProxies = true;
proxySelector.OnNormalProxySuccess(proxy);
break;
}
proxySelector.OnNormalProxyFail(proxy);
}
if (!isSuccessfulByNormalProxies)
{
for (byte i = 0; i < 2; i++)
{
bool isAdvancedProxy = proxySelector.TryPreferAdvancedProxy(out var proxy);
rspText = await GetResponseTextByProxyAsync(uri, rspFetcher, proxy, rspValidator);
if (rspText != null)
{
if (isAdvancedProxy)
{
proxySelector.OnAdvancedProxySuccess(proxy);
}
else
{
proxySelector.OnNormalProxySuccess(proxy);
}
break;
}
if (isAdvancedProxy)
{
proxySelector.OnAdvancedProxyFail(proxy);
}
else
{
proxySelector.OnNormalProxyFail(proxy);
}
}
}
return(rspText);
}