public override Page Download(Request request, ISpider spider)
{
if (spider.Site == null)
{
return(null);
}
Site site = spider.Site;
var acceptStatCodes = site.AcceptStatCode;
//Logger.InfoFormat("Downloading page {0}", request.Url);
HttpResponseMessage response = null;
var proxy = site.GetHttpProxyFromPool();
request.PutExtra(Request.Proxy, proxy);
int statusCode = 200;
try
{
if (PostBodyGenerator != null)
{
SingleExecutor.Execute(() =>
{
PostBodyGenerator(spider.Site, request);
});
}
var httpMessage = GenerateHttpRequestMessage(request, site);
response = RedialManagerUtils.Execute("downloader-download", (m) =>
{
var message = (HttpRequestMessage)m;
return(httpClient.SendAsync(message).Result);
}, httpMessage);
AddRequestCount();
response.EnsureSuccessStatusCode();
if (!site.AcceptStatCode.Contains(response.StatusCode))
{
throw new DownloadException($"下载 {request.Url} 失败. Code: {response.StatusCode}");
}
statusCode = (int)response.StatusCode;
request.PutExtra(Request.StatusCode, statusCode);
Page page = HandleResponse(request, response, statusCode, site);
// need update
page.TargetUrl = request.Url.ToString();
//page.SetRawText(File.ReadAllText(@"C:\Users\Lewis\Desktop\taobao.html"));
// 这里只要是遇上登录的, 则在拨号成功之后, 全部抛异常在Spider中加入Scheduler调度
// 因此如果使用多线程遇上多个Warning Custom Validate Failed不需要紧张, 可以考虑用自定义Exception分开
ValidatePage(page, spider);
// 结束后要置空, 这个值存到Redis会导致无限循环跑单个任务
request.PutExtra(Request.CycleTriedTimes, null);
//#if !NET_CORE
// httpWebRequest.ServicePoint.ConnectionLimit = int.MaxValue;
//#endif
return(page);
//正常结果在上面已经Return了, 到此处必然是下载失败的值.
//throw new SpiderExceptoin("Download failed.");
}
catch (RedialException)
{
throw;
}
catch (Exception e)
{
Page page = new Page(request, site.ContentType)
{
Exception = e
};
ValidatePage(page, spider);
throw;
}
finally
{
// 先Close Response, 避免前面语句异常导致没有关闭.
try
{
//ensure the connection is released back to pool
//check:
//EntityUtils.consume(httpResponse.getEntity());
response?.Dispose();
}
catch (Exception e)
{
spider.Logger.Warn("Close response fail.", e);
}
}
}
public override Page Download(Request request, ISpider spider)
{
if (spider.Site == null)
{
return(null);
}
Site site = spider.Site;
ICollection <int> acceptStatCode = site.AcceptStatCode;
var charset = site.Encoding;
//Logger.InfoFormat("Downloading page {0}", request.Url);
int statusCode = 0;
HttpWebResponse response = null;
try
{
if (CustomizeRequestBeforeGenerate != null)
{
SingleExecutor.Execute(() =>
{
CustomizeRequestBeforeGenerate(request);
});
}
var httpWebRequest = GetHttpWebRequest(request, site);
response = RedialManagerUtils.Execute("downloader-download", h =>
{
HttpWebRequest tmpHttpWebRequest = (HttpWebRequest)h;
if (HttpConstant.Method.Post.Equals(request.Method) && !string.IsNullOrEmpty(request.PostBody))
{
var data = spider.Site.Encoding.GetBytes(request.PostBody);
#if !NET_CORE
tmpHttpWebRequest.ContentLength = data.Length;
using (Stream newStream = tmpHttpWebRequest.GetRequestStream())
{
newStream.Write(data, 0, data.Length);
newStream.Close();
}
#else
using (Stream newStream = tmpHttpWebRequest.GetRequestStreamAsync().Result)
{
newStream.Write(data, 0, data.Length);
newStream.Dispose();
}
#endif
}
#if !NET_CORE
return((HttpWebResponse)tmpHttpWebRequest?.GetResponse());
#else
return((HttpWebResponse)tmpHttpWebRequest?.GetResponseAsync().Result);
#endif
}, httpWebRequest);
statusCode = (int)response.StatusCode;
request.PutExtra(Request.StatusCode, statusCode);
if (StatusAccept(acceptStatCode, statusCode))
{
Page page = HandleResponse(request, charset, response, statusCode, site);
//page.SetRawText(File.ReadAllText(@"C:\Users\Lewis\Desktop\taobao.html"));
// 这里只要是遇上登录的, 则在拨号成功之后, 全部抛异常在Spider中加入Scheduler调度
// 因此如果使用多线程遇上多个Warning Custom Validate Failed不需要紧张, 可以考虑用自定义Exception分开
ValidatePage(page);
// 结束后要置空, 这个值存到Redis会导置无限循环跑单个任务
request.PutExtra(Request.CycleTriedTimes, null);
#if !NET_CORE
httpWebRequest.ServicePoint.ConnectionLimit = int.MaxValue;
#endif
return(page);
}
else
{
throw new SpiderExceptoin("Download failed.");
}
//正常结果在上面已经Return了, 到此处必然是下载失败的值.
//throw new SpiderExceptoin("Download failed.");
}
catch (Exception e)
{
if (!(e is RedialException))
{
Page page = new Page(request, site.ContentType)
{
Exception = e
};
ValidatePage(page);
}
throw;
}
finally
{
// 先Close Response, 避免前面语句异常导致没有关闭.
try
{
//ensure the connection is released back to pool
//check:
//EntityUtils.consume(httpResponse.getEntity());
#if !NET_CORE
response?.Close();
#else
response?.Dispose();
#endif
}
catch (Exception e)
{
Logger.Warn("Close response fail.", e);
}
request.PutExtra(Request.StatusCode, statusCode);
}
}
