/// <summary>
/// The crawl process.
/// </summary>
/// <param name="threadIndex">
/// The thread index.
/// </param>
private void CrawlProcess(object threadIndex)
{
var currentThreadIndex = (int)threadIndex;
while (true)
{
// 根据队列中的 Url 数量和空闲线程的数量，判断线程是睡眠还是退出
if (UrlQueue.Instance.Count == 0)
{
this.threadStatus[currentThreadIndex] = true;
if (!this.threadStatus.Any(t => t == false))
{
break;
}
Thread.Sleep(2000);
continue;
}
this.threadStatus[currentThreadIndex] = false;
if (UrlQueue.Instance.Count == 0)
{
continue;
}
UrlInfo urlInfo = UrlQueue.Instance.DeQueue();
var curIPProxy = Settings.GetIPProxy();
try
{
if (urlInfo == null)
{
continue;
}
// 1~5 秒随机间隔的自动限速
if (this.Settings.AutoSpeedLimit)
{
try
{
var maxSecond = 5000;
var inSecond = 1000;
if (this.Settings.AutoSpeedLimitMinMSecond >= inSecond)
{
inSecond = this.Settings.AutoSpeedLimitMinMSecond;
}
if (this.Settings.AutoSpeedLimitMaxMSecond >= maxSecond)
{
maxSecond = this.Settings.AutoSpeedLimitMaxMSecond;
}
int span = this.random.Next(inSecond, maxSecond);
Thread.Sleep(span);
}
catch (Exception ex)
{
throw new Exception("AutoSpeedLimit" + ex.Message);
}
}
string html = string.Empty;
switch (Settings.CrawlMode)
{
case EnumCrawlMode.PhantomJsViaSelenium:
html = GetPhantomJsResult(urlInfo);
break;
case EnumCrawlMode.HttpHelper:
case EnumCrawlMode.SuperWebClient:
if (Settings.UseSuperWebClient)
{
html = GetSupperHttpResult(urlInfo);
}
else
{
html = GetHttpResult(urlInfo);
}
break;
}
if (!string.IsNullOrEmpty(html))
{
this.ParseLinks(urlInfo, html);
}
if (this.DataReceivedEvent != null)
{
this.DataReceivedEvent(
new DataReceivedEventArgs
{
Url = urlInfo.UrlString,
Depth = urlInfo.Depth,
Html = html,
IpProx = curIPProxy, urlInfo = urlInfo
});
}
}
catch (WebException webEx)
{
var ev = new CrawlErrorEventArgs
{
Url = urlInfo.UrlString,
Depth = urlInfo.Depth,
Exception = webEx,
IpProx = curIPProxy,
urlInfo = urlInfo
};
if (webEx.Status == WebExceptionStatus.Timeout || webEx.Status == WebExceptionStatus.ProtocolError || webEx.Message.Contains("远程服务器返回错误") || webEx.Message.Contains("网关"))
{
//Settings.SetUnviableIP(curIPProxy);//设置为无效代理
ev.needChangeIp = true;
}
ev.needTryAgain = true;
if (this.CrawlErrorEvent != null)
{
if (urlInfo != null)
{
this.CrawlErrorEvent(ev
);
}
}
}
catch (Exception exception)
{
var errorEV = new CrawlErrorEventArgs {
Url = urlInfo.UrlString, Depth = urlInfo.Depth, Exception = exception, IpProx = curIPProxy, urlInfo = urlInfo
};
if (exception.Message.Contains("超时") || exception.Message.Contains("远程服务器返回错误"))
{
// Settings.SetUnviableIP(curIPProxy);//设置为无效代理
errorEV.needChangeIp = true;
}
errorEV.needTryAgain = true;
if (this.CrawlErrorEvent != null)
{
if (urlInfo != null)
{
this.CrawlErrorEvent(errorEV
);
}
}
}
finally
{
//if (request != null)
//{
// request.Abort();
//}
//if (response != null)
//{
// response.Close();
//}
}
}
}
private void Master_CrawlErrorEvent(CrawlErrorEventArgs args)
{
//
}
/// <summary>
/// The crawl process.
/// </summary>
/// <param name="threadIndex">
/// The thread index.
/// </param>
private void CrawlProcess_Abort(object threadIndex)
{
var currentThreadIndex = (int)threadIndex;
while (true)
{
// 根据队列中的 Url 数量和空闲线程的数量，判断线程是睡眠还是退出
if (UrlQueue.Instance.Count == 0)
{
this.threadStatus[currentThreadIndex] = true;
if (!this.threadStatus.Any(t => t == false))
{
break;
}
Thread.Sleep(2000);
continue;
}
this.threadStatus[currentThreadIndex] = false;
if (UrlQueue.Instance.Count == 0)
{
continue;
}
UrlInfo urlInfo = UrlQueue.Instance.DeQueue();
HttpWebRequest request = null;
HttpWebResponse response = null;
IPProxy curIPProxy = null;
try
{
if (urlInfo == null)
{
continue;
}
// 1~5 秒随机间隔的自动限速
if (this.Settings.AutoSpeedLimit)
{
int span = this.random.Next(1000, 5000);
Thread.Sleep(span);
}
// 创建并配置Web请求
request = WebRequest.Create(urlInfo.UrlString) as HttpWebRequest;
curIPProxy = this.ConfigRequest(request);//返回当前的代理地址
if (request != null)
{
response = request.GetResponse() as HttpWebResponse;
}
if (response != null)
{
this.PersistenceCookie(response);
Stream stream = null;
// 如果页面压缩，则解压数据流
if (response.ContentEncoding == "gzip")
{
Stream responseStream = response.GetResponseStream();
if (responseStream != null)
{
stream = new GZipStream(responseStream, CompressionMode.Decompress);
}
}
else
{
stream = response.GetResponseStream();
}
using (stream)
{
string html = this.ParseContent(stream, response.CharacterSet);
this.ParseLinks(urlInfo, html);
if (this.DataReceivedEvent != null)
{
this.DataReceivedEvent(
new DataReceivedEventArgs
{
Url = urlInfo.UrlString,
Depth = urlInfo.Depth,
Html = html, IpProx = curIPProxy
});
}
if (stream != null)
{
stream.Close();
}
}
}
}
catch (WebException webEx)
{
var ev = new CrawlErrorEventArgs
{
Url = urlInfo.UrlString,
Depth = urlInfo.Depth,
Exception = webEx,
IpProx = curIPProxy
};
if (webEx.Status == WebExceptionStatus.Timeout || webEx.Status == WebExceptionStatus.ProtocolError || webEx.Message.Contains("远程服务器返回错误") || webEx.Message.Contains("网关"))
{
//Settings.SetUnviableIP(curIPProxy);//设置为无效代理
ev.needChangeIp = true;
}
ev.needTryAgain = true;
if (this.CrawlErrorEvent != null)
{
if (urlInfo != null)
{
this.CrawlErrorEvent(ev
);
}
}
}
catch (Exception exception)
{
var errorEV = new CrawlErrorEventArgs {
Url = urlInfo.UrlString, Depth = urlInfo.Depth, Exception = exception, IpProx = curIPProxy
};
if (exception.Message.Contains("超时") || exception.Message.Contains("远程服务器返回错误"))
{
// Settings.SetUnviableIP(curIPProxy);//设置为无效代理
errorEV.needChangeIp = true;
}
errorEV.needTryAgain = true;
if (this.CrawlErrorEvent != null)
{
if (urlInfo != null)
{
this.CrawlErrorEvent(errorEV
);
}
}
}
finally
{
if (request != null)
{
request.Abort();
}
if (response != null)
{
response.Close();
}
}
}
}
