/// <summary>
/// 异步创建爬虫
/// </summary>
/// <param name="uri">爬虫URL地址</param>
/// <param name="proxy">代理服务器</param>
/// <returns>网页源代码</returns>
public async Task StartAsync(Uri uri, Script script, Operation operation, CrawlerPartConfig cpc)
{
await Task.Run(() =>
{
try
{
Semaphore.Wait();
//OnStart?.Invoke(this, new OnStartEventArgs(uri));
var _service = PhantomJSDriverService.CreateDefaultService();
_service.LoadImages = false;
var _option = new PhantomJSOptions();
var driver = new PhantomJSDriver(_service, _option);
try
{
//WriteLog.InsertLogs(uri.ToString(), "步骤零");
var watch = DateTime.Now;
driver.Navigate().GoToUrl(uri.ToString());
if (script != null)
{
driver.ExecuteScript(script.Code, script.Args);
}
if (operation != null)
{
ExecuteAction(operation, driver);
}
var threadId = Thread.CurrentThread.ManagedThreadId;
var seconds = Convert.ToInt32(DateTime.Now.Subtract(watch).TotalSeconds);
//WriteLog.InsertLogs(uri.ToString(), "步骤一");
//打开网页时间过长可能导致driver被垃圾回收，限制为30秒
if (seconds < 30)
{
News news = GetNews(driver, cpc, uri, threadId, seconds);
OnCompleted?.Invoke(this, new OnCompletedEventArgs(news));
//OnCompleted?.Invoke(this, new OnCompletedEventArgs(uri, threadId, milliseconds, pageSource, driver, cpc));
}
else
{
WriteLog.InsertLogs(uri.ToString(), "打开网页超时");
if (driver != null)
{
driver.Quit();
driver = null;
//WriteLog.InsertLogs(uri.ToString(), "结束");
}
}
}
catch (Exception ex)
{
OnError?.Invoke(this, new OnErrorEventArgs(uri, ex));
//WriteLog.InsertLogs(uri.ToString(), ex.Message);
}
finally
{
if (driver != null)
{
driver.Quit();
//WriteLog.InsertLogs(uri.ToString(), "结束");
}
}
}
catch (Exception ex)
{
OnError?.Invoke(this, new OnErrorEventArgs(uri, ex));
//WriteLog.InsertLogs(uri.ToString(), ex.Message);
}
finally
{
Semaphore.Release();
}
});
}