private List <SerpWebPage> Execute(string query, IRuntimeModule <HttpProviderRuntimeConfig, HttpProviderData> httpModule, IRuntimeModule <AntigateTaskConfig, AntigateTaskResult> antigateModule)
{
if (httpModule == null)
{
throw new NullReferenceException("Http module");
}
if (antigateModule == null)
{
throw new NullReferenceException("Antigate module");
}
List <SerpWebPage> result = new List <SerpWebPage>();
int pageLimit = Configuration.PageLimit.HasValue ? Configuration.PageLimit.Value : 1;
YandexHtmlSerpParser parser = new YandexHtmlSerpParser();
HtmlTagPageParser tagParser = new HtmlTagPageParser();
for (int i = 0; i < pageLimit; i++)
{
var serpList = ExecuteRequest(new YandexQuery(query, i, Configuration.Region), parser, httpModule, antigateModule);
result.AddRange(LoadSerpItemDetails(tagParser, httpModule, serpList));
}
return(result);
}
private List <SerpWebPage> LoadSerpItemDetails(HtmlTagPageParser tagParser, IRuntimeModule <HttpProviderRuntimeConfig, HttpProviderData> httpModule, List <YandexHtmlSerpItem> serpList)
{
List <SerpWebPage> result = new List <SerpWebPage>();
foreach (var serpItem in serpList)
{
var targetUrl = serpItem.Href;
var title = string.Empty;
TryExtractDetaisl(tagParser, httpModule, serpItem.Href, out targetUrl, out title);
SerpWebPage webPage = new SerpWebPage();
webPage.Position = serpItem.Postion;
webPage.Url = string.IsNullOrEmpty(targetUrl) ? serpItem.Href: targetUrl;
webPage.Title = title;
result.Add(webPage);
}
return(result);
}
private void TryExtractDetaisl(HtmlTagPageParser tagParser, IRuntimeModule <HttpProviderRuntimeConfig, HttpProviderData> httpModule, string url, out string redirectUrl, out string title)
{
redirectUrl = string.Empty;
title = string.Empty;
var httpResult = RuntimeTask.Run(Context, httpModule, new HttpProviderRuntimeConfig()
{
Query = url
});
if (httpResult.IsSuccessfully)
{
var extractor = new HtmlTextAttributeParser()
{
Attribute = "content",
PostHandle = (value) =>
{
string urlTag = "URL=";
int startIndex = value.IndexOf(urlTag);
if (startIndex != -1)
{
value = value.Substring(startIndex + urlTag.Length, value.Length - (urlTag.Length + startIndex));
value = value.Trim('\'');
}
return(value);
}
};
var tagConfig = new HtmlTagPageConfig();
tagConfig.Tags.Add("redirecturl", new SinglHtmlNodeSelector()
{
Tag = new TagProperties()
{
Path = @"//meta[@http-equiv='refresh']", Extractor = extractor
}
});
tagConfig.Tags.Add("title", new SinglHtmlNodeSelector()
{
Tag = new TagProperties()
{
Path = @"//title", Extractor = new HtmlTagInnerText()
}
});
using (var stream = httpResult.Data.GetContent())
{
tagConfig.Stream = stream;
var parseResult = RuntimeTask.Run(Context, tagParser, tagConfig);
if (parseResult.IsSuccessfully)
{
if (parseResult.Data.Values["redirecturl"] != null)
{
redirectUrl = (string)parseResult.Data.Values["redirecturl"];
}
if (parseResult.Data.Values["title"] != null)
{
title = (string)parseResult.Data.Values["title"];
}
}
}
if (!string.IsNullOrEmpty(redirectUrl))
{
httpResult = RuntimeTask.Run(Context, httpModule, new HttpProviderRuntimeConfig()
{
Query = redirectUrl
});
if (httpResult.IsSuccessfully)
{
using (var stream = httpResult.Data.GetContent())
{
tagConfig.Stream = stream;
var tagResult = tagParser.Run(tagConfig);
if (tagResult.Values["title"] != null)
{
title = (string)tagResult.Values["title"];
}
}
}
}
}
}