background task only runs once and loads sites, if they are available #21

Author: zetroot

src/NTorSpectator.Observer/Services/SitesUpdater.cs

@@ -0,0 +1,36 @@
+using Microsoft.Extensions.Options;
+using NTorSpectator.Services;
+
+namespace NTorSpectator.Observer.Services;
+
+public class SitesUpdater : BackgroundService
+{
+    private readonly ILogger<SitesUpdater> _logger;
+    private readonly string _torSitesFile;
+    private readonly ISitesCatalogue _sitesCatalogue;
+
+    public SitesUpdater(ILogger<SitesUpdater> logger, IOptions<SpectatorSettings> opts, ISitesCatalogue sitesCatalogue)
+    {
+        _logger = logger;
+        _sitesCatalogue = sitesCatalogue;
+        _torSitesFile = opts.Value.SiteList;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+    {
+        if (!File.Exists(_torSitesFile))
+        {
+            _logger.LogWarning("Tor sites file is not found at path {TorSitesFilePath}. Exiting", _torSitesFile);
+            return;
+        }
+        
+        var sites = await File.ReadAllLinesAsync(_torSitesFile);
+        foreach (var site in sites)
+        {
+            if (string.IsNullOrWhiteSpace(site))
+                continue;
+            await _sitesCatalogue.AddIfNotExists(site);
+        }
+        _logger.LogDebug("Finished adding sites");
+    }
+}