NadekoBot Patronage system, Search commands improvements + fixes

src/NadekoBot/Modules/Searches/Search/Searx/SearxSearchService.cs

@@ -0,0 +1,76 @@
+using MorseCode.ITask;
+using System.Diagnostics;
+using System.Globalization;
+using System.Text.Json;
+
+namespace NadekoBot.Modules.Searches;
+
+public sealed class SearxSearchService : SearchServiceBase, INService
+{
+    private readonly IHttpClientFactory _http;
+    private readonly SearchesConfigService _scs;
+    
+    private static readonly Random _rng = new NadekoRandom();
+
+    public SearxSearchService(IHttpClientFactory http, SearchesConfigService scs)
+        => (_http, _scs) = (http, scs);
+
+    private string GetRandomInstance()
+    {
+        var instances = _scs.Data.SearxInstances;
+
+        if (instances is null or { Count: 0 })
+            throw new InvalidOperationException("No searx instances specified in searches.yml");
+
+        return instances[_rng.Next(0, instances.Count)];
+    }
+    
+    public override async ITask<SearxSearchResult> SearchAsync(string query)
+    {
+        ArgumentNullException.ThrowIfNull(query);
+
+        var instanceUrl = GetRandomInstance();
+        
+        Log.Information("Using {Instance} instance for web search...", instanceUrl);
+        var sw = Stopwatch.StartNew();
+        using var http = _http.CreateClient();
+        await using var res = await http.GetStreamAsync($"{instanceUrl}"
+                                                        + $"?q={Uri.EscapeDataString(query)}"
+                                                        + $"&format=json"
+                                                        + $"&strict=2");
+
+        sw.Stop();
+        var dat = await JsonSerializer.DeserializeAsync<SearxSearchResult>(res);
+
+        if (dat is null)
+            return new SearxSearchResult();
+        
+        dat.SearchTime = sw.Elapsed.TotalSeconds.ToString("N2", CultureInfo.InvariantCulture); 
+        return dat;
+    }
+
+    public override async ITask<SearxImageSearchResult> SearchImagesAsync(string query)
+    {
+        ArgumentNullException.ThrowIfNull(query);
+        
+        var instanceUrl = GetRandomInstance();
+        
+        Log.Information("Using {Instance} instance for img search...", instanceUrl);
+        var sw = Stopwatch.StartNew();
+        using var http = _http.CreateClient();
+        await using var res = await http.GetStreamAsync($"{instanceUrl}"
+                                                        + $"?q={Uri.EscapeDataString(query)}"
+                                                        + $"&format=json"
+                                                        + $"&category_images=on"
+                                                        + $"&strict=2");
+
+        sw.Stop();
+        var dat = await JsonSerializer.DeserializeAsync<SearxImageSearchResult>(res);
+
+        if (dat is null)
+            return new SearxImageSearchResult();
+        
+        dat.SearchTime = sw.Elapsed.TotalSeconds.ToString("N2", CultureInfo.InvariantCulture); 
+        return dat;
+    }
+}