protected override async Task <Response> ImplDownloadAsync(Request request)
{
var response = new Response {
Request = request
};
for (var i = 0; i < RetryTime; ++i)
{
HttpResponseMessage httpResponseMessage = null;
WebProxy proxy = null;
try
{
var httpRequestMessage = GenerateHttpRequestMessage(request);
if (UseProxy)
{
if (HttpProxyPool == null)
{
response.Exception = "HttpProxyPool is null";
response.Success = false;
Logger?.LogError(
$"{request.OwnerId} download {request.Url} failed [{i}]: {response.Exception}");
return(response);
}
else
{
proxy = HttpProxyPool.GetProxy();
if (proxy == null)
{
response.Exception = "There is no available proxy";
response.Success = false;
Logger?.LogError(
$"{request.OwnerId} download {request.Url} failed [{i}]: {response.Exception}");
return(response);
}
}
}
var httpClientEntry = GetHttpClientEntry(proxy == null ? "DEFAULT" : $"{proxy.Address}", proxy);
httpResponseMessage = Framework.NetworkCenter == null
? await httpClientEntry.HttpClient.SendAsync(httpRequestMessage)
: await Framework.NetworkCenter.Execute(async() =>
await httpClientEntry.HttpClient.SendAsync(httpRequestMessage));
httpResponseMessage.EnsureSuccessStatusCode();
response.TargetUrl = httpResponseMessage.RequestMessage.RequestUri.AbsoluteUri;
response.MediaType = httpResponseMessage.Content.Headers.ContentType.MediaType;
response.CharSet = httpResponseMessage.Content.Headers.ContentType.CharSet;
response.Content = await httpResponseMessage.Content.ReadAsByteArrayAsync();
if (!string.IsNullOrWhiteSpace(request.ChangeIpPattern))
{
var rawtext = ResponseExtensions.ReadContent(request, response.Content, response.CharSet);
if (Regex.IsMatch(rawtext, request.ChangeIpPattern))
{
if (UseProxy)
{
response.TargetUrl = null;
response.Content = null;
response.Success = false;
// 把代理设置为空，影响 final 代码块里不作归还操作，等于删除此代理
proxy = null;
}
else
{
// 不支持切换 IP
if (Framework.NetworkCenter == null ||
!Framework.NetworkCenter.SupportAdsl)
{
response.Success = false;
response.Exception = "IP Banded";
Logger?.LogError(
$"{request.OwnerId} download {request.Url} failed [{i}]: {response.Exception}");
return(response);
}
else
{
Framework.NetworkCenter.Redial();
}
}
}
}
else
{
response.Success = true;
Logger?.LogInformation(
$"{request.OwnerId} download {request.Url} success");
return(response);
}
}
catch (Exception e)
{
response.Exception = e.Message;
response.Success = false;
Logger?.LogError($"{request.OwnerId} download {request.Url} failed [{i}]: {e}");
}
finally
{
if (HttpProxyPool != null && proxy != null)
{
await HttpProxyPool.ReturnProxy(proxy,
httpResponseMessage?.StatusCode ?? HttpStatusCode.ServiceUnavailable);
}
try
{
httpResponseMessage?.Dispose();
}
catch (Exception e)
{
Logger?.LogWarning($"{request.OwnerId} dispose response {request.Url} failed [{i}]: {e}");
}
}
// 下载失败需要等待一秒，防止频率过高。
// TODO: 改成可配置
Thread.Sleep(1000);
}
return(response);
}
protected override async Task <Response> ImplDownloadAsync(Request request)
{
var response = new Response
{
Request = request
};
for (int i = 0; i < RetryTime; ++i)
{
HttpResponseMessage httpResponseMessage = null;
WebProxy proxy = null;
try
{
var httpRequestMessage = GenerateHttpRequestMessage(request);
if (UseProxy)
{
if (HttpProxyPool == null)
{
response.Exception = "未正确配置代理池";
response.Success = false;
Logger?.LogError(
$"任务 {request.OwnerId} 下载 {request.Url} 失败 [{i}]: {response.Exception}");
return(response);
}
else
{
proxy = HttpProxyPool.GetProxy();
if (proxy == null)
{
response.Exception = "没有可用的代理";
response.Success = false;
Logger?.LogError(
$"任务 {request.OwnerId} 下载 {request.Url} 失败 [{i}]: {response.Exception}");
return(response);
}
}
}
var httpClientEntry = GetHttpClientEntry(proxy == null ? "DEFAULT" : $"{proxy.Address}", proxy);
httpResponseMessage = Framework.NetworkCenter == null
? await httpClientEntry.HttpClient.SendAsync(httpRequestMessage)
: await Framework.NetworkCenter.Execute(async() =>
await httpClientEntry.HttpClient.SendAsync(httpRequestMessage));
httpResponseMessage.EnsureSuccessStatusCode();
response.TargetUrl = httpResponseMessage.RequestMessage.RequestUri.AbsoluteUri;
var bytes = httpResponseMessage.Content.ReadAsByteArrayAsync().Result;
if (!ExcludeMediaTypes.Any(t =>
httpResponseMessage.Content.Headers.ContentType.MediaType.Contains(t)))
{
if (!DownloadFile)
{
StorageFile(request, bytes);
}
}
else
{
var content = ReadContent(request, bytes,
httpResponseMessage.Content.Headers.ContentType.CharSet);
if (DecodeHtml)
{
#if NETFRAMEWORK
content = System.Web.HttpUtility.UrlDecode(
System.Web.HttpUtility.HtmlDecode(content),
string.IsNullOrEmpty(request.Encoding)
? Encoding.UTF8
: Encoding.GetEncoding(request.Encoding));
#else
content = WebUtility.UrlDecode(WebUtility.HtmlDecode(content));
#endif
}
response.RawText = content;
}
if (!string.IsNullOrWhiteSpace(request.ChangeIpPattern) &&
Regex.IsMatch(response.RawText, request.ChangeIpPattern))
{
if (UseProxy)
{
response.TargetUrl = null;
response.RawText = null;
response.Success = false;
// 把代理设置为空，影响 final 代码块里不作归还操作，等于删除此代理
proxy = null;
}
else
{
// 不支持切换 IP
if (Framework.NetworkCenter == null ||
!Framework.NetworkCenter.SupportAdsl)
{
response.Success = false;
response.Exception = "IP Banded";
Logger?.LogError(
$"任务 {request.OwnerId} 下载 {request.Url} 失败 [{i}]: {response.Exception}");
return(response);
}
else
{
Framework.NetworkCenter.Redial();
}
}
}
else
{
response.Success = true;
Logger?.LogInformation(
$"任务 {request.OwnerId} 下载 {request.Url} 成功");
return(response);
}
}
catch (Exception e)
{
response.Exception = e.Message;
response.Success = false;
Logger?.LogError($"任务 {request.OwnerId} 下载 {request.Url} 失败 [{i}]: {e}");
}
finally
{
if (HttpProxyPool != null && proxy != null)
{
HttpProxyPool.ReturnProxy(proxy,
httpResponseMessage?.StatusCode ?? HttpStatusCode.ServiceUnavailable);
}
try
{
httpResponseMessage?.Dispose();
}
catch (Exception e)
{
Logger?.LogWarning($"任务 {request.OwnerId} 释放 {request.Url} 失败 [{i}]: {e}");
}
}
// 下载失败需要等待一秒，防止频率过高。
// TODO: 改成可配置
Thread.Sleep(1000);
}
return(response);
}