public Bot()
{
_db = new ContentCrawlerDbContext();
_articleCrawler = null;
_currentConfigId = 0;
}
private ArticleCrawler CreateArticleCrawler(CrawlerInfor crawlerInfo)
{
Console.WriteLine("[Getting Crawler Configs in database]");
var inDbConfigs = _db.CrawlerConfigs.Find(crawlerInfo.ConfigId);
Console.WriteLine("[Creating new ArticleCrawler Instance]");
var crawler = new ArticleCrawler()
{
CategoryId = inDbConfigs.CategoryId,
ContentSelector = inDbConfigs.ContentSelector,
DescriptionSelector = inDbConfigs.DescriptionSelector,
RemovalSelector = inDbConfigs.RemovalSelector,
Source = inDbConfigs.Route,
TitleSelector = inDbConfigs.TitleSelector
};
return(crawler);
}
public void Run()
{
var factory = new ConnectionFactory()
{
HostName = "localhost"
};
using (var connection = factory.CreateConnection())
using (var channel = connection.CreateModel())
{
channel.QueueDeclare(queue: "amqHelloRabbitMq",
durable: true,
exclusive: false,
autoDelete: false,
arguments: null);
var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
var body = ea.Body.ToArray();
var jsonData = Encoding.UTF8.GetString(body);
var crawlerInfo = GetCrawlerInfor(jsonData);
var messageConfigId = crawlerInfo.ConfigId;
if (_currentConfigId == 0)
{
Console.WriteLine("[Init cache]");
//init crawler
_articleCrawler = CreateArticleCrawler(crawlerInfo);
//init current config id
_currentConfigId = messageConfigId;
}
else if (messageConfigId != _currentConfigId)
{
Console.WriteLine($"[Update cache]");
//update crawler
_articleCrawler = CreateArticleCrawler(crawlerInfo);
//update config id
_currentConfigId = messageConfigId;
}
//craw article
//update curent crawler link
_articleCrawler.Link = crawlerInfo.Link;
//crawl article
var article = _articleCrawler.CrawlArticle();
if (article == null)
{
Console.WriteLine("[Crawled Failed] " + crawlerInfo.Link);
return;
}
//save to db
_db.Articles.Add(article);
_db.SaveChanges();
Console.WriteLine("[Saved] " + article.Title);
};
channel.BasicConsume(queue: "amqHelloRabbitMq",
autoAck: true,
consumer: consumer);
Console.WriteLine(" Press [enter] to exit.");
Console.ReadLine();
}
}