Host on edges

NostrStreamer/Services/EdgeSteering.cs

@@ -0,0 +1,35 @@
+using System.Diagnostics;
+using MaxMind.GeoIP2;
+
+namespace NostrStreamer.Services;
+
+public class EdgeSteering
+{
+    private readonly Config _config;
+    private readonly IGeoIP2DatabaseReader _db;
+    private readonly ILogger<EdgeSteering> _logger;
+
+    public EdgeSteering(Config config, IGeoIP2DatabaseReader db, ILogger<EdgeSteering> logger)
+    {
+        _config = config;
+        _db = db;
+        _logger = logger;
+    }
+
+    public EdgeLocation? GetEdge(HttpContext ctx)
+    {
+        var sw = Stopwatch.StartNew();
+        var loc = ctx.GetLocation(_db);
+        if (loc != default)
+        {
+            var ret = _config.Edges.MinBy(a => Extensions.GetDistance(a.Longitude, a.Latitude, loc.Value.lon, loc.Value.lat));
+            sw.Stop();
+            _logger.LogTrace("Found edge in {n:#,##0.#}ms", sw.Elapsed.TotalMilliseconds);
+            return ret;
+        }
+        
+        sw.Stop();
+        _logger.LogTrace("Found no edge in {n:#,##0.#}ms", sw.Elapsed.TotalMilliseconds);
+        return default;
+    }
+}