Newsbot.Collector/Newsbot.Collector.Services/Jobs/RssWatcherJob.cs

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using System.ServiceModel.Syndication;
using System.Xml;
using Newsbot.Collector.Database.Repositories;
using Newsbot.Collector.Domain.Consts;
using Newsbot.Collector.Domain.Interfaces;
using Newsbot.Collector.Domain.Models;
using Newsbot.Collector.Domain.Models.Config;
using Newsbot.Collector.Services.HtmlParser;
using Serilog;
namespace Newsbot.Collector.Services.Jobs;
public class RssWatcherJobOptions
{
public string? ConnectionString { get; init; }
public string? OpenTelemetry { get; init; }
public bool IsEnabled { get; init; }
}
// This class was made to work with Hangfire and it does not support constructors.
public class RssWatcherJob
{
private const string JobName = "RssWatcherJob";
private IArticlesRepository _articles;
private ILogger _logger;
private IDiscordQueueRepository _queue;
private ISourcesRepository _source;
public RssWatcherJob()
{
_articles = new ArticlesTable("");
_queue = new DiscordQueueTable("");
_source = new SourcesTable("");
_logger = JobLogger.GetLogger("", JobName);
}
public void InitAndExecute(RssWatcherJobOptions options)
{
_articles = new ArticlesTable(options.ConnectionString ?? "");
_queue = new DiscordQueueTable(options.ConnectionString ?? "");
_source = new SourcesTable(options.ConnectionString ?? "");
_logger = JobLogger.GetLogger(options.OpenTelemetry ?? "", JobName);
_logger.Information($"{JobName} - Job was triggered.");
if (!options.IsEnabled)
{
_logger.Information($"{JobName} - Going to exit because feature flag is off.");
return;
}
_logger.Information($"{JobName} - Setting up the job.");
Execute();
}
public void Execute()
{
var articles = new List<ArticlesModel>();
_logger.Information($"{JobName} - Requesting sources");
var sources = _source.ListByType(SourceTypes.Rss);
_logger.Information($"{JobName} - Got {sources.Count} back");
foreach (var source in sources)
{
_logger.Information($"{JobName} - Starting to process '{source.Name}'");
_logger.Information($"{JobName} - Starting to request feed to be processed");
var results = Collect(source.Url, source.ID);
_logger.Information($"{JobName} - Collected {results.Count} posts");
articles.AddRange(results);
}
_logger.Information($"{JobName} - Sending posts over to the database");
UpdateDatabase(articles);
_logger.Information($"{JobName} - Done!");
}
public List<ArticlesModel> Collect(string url, Guid sourceId, int sleep = 3000)
{
var collectedPosts = new List<ArticlesModel>();
using var reader = XmlReader.Create(url);
var feed = SyndicationFeed.Load(reader);
foreach (var post in feed.Items.ToList())
{
var articleUrl = post.Links[0].Uri.AbsoluteUri;
// Check if we have seen the url before
// If we have, skip and save the site bandwidth
if (IsThisUrlKnown(articleUrl)) continue;
var meta = new HtmlPageReader(new HtmlPageReaderOptions
{
Url = articleUrl
});
meta.Parse();
var article = new ArticlesModel
{
Title = post.Title.Text,
Tags = FetchTags(post),
URL = articleUrl,
PubDate = post.PublishDate.DateTime,
Thumbnail = meta.Data.Header.Image,
Description = meta.Data.Header.Description,
SourceID = sourceId
};
collectedPosts.Add(article);
// try to not be too greedy
Thread.Sleep(sleep);
}
return collectedPosts;
}
public void UpdateDatabase(List<ArticlesModel> items)
{
foreach (var item in items)
{
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if (item.URL is null)
{
Log.Warning("RSS Watcher collected a blank url and was skipped.");
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continue;
}
var p = _articles.New(item);
_queue.New(new DiscordQueueModel
{
ArticleID = p.ID
});
}
}
private bool IsThisUrlKnown(string url)
{
var isKnown = _articles.GetByUrl(url);
if (isKnown.URL == url) return true;
return false;
}
private string FetchTags(SyndicationItem post)
{
var result = "";
foreach (var tag in post.Categories) result += $"{tag.Name},";
return result;
}
}