add redis for character identification

MareSynchronosServer/MareSynchronosShared/Services/BaseClientIdentificationService.cs

@@ -0,0 +1,62 @@
+using System.Collections.Concurrent;
+using MareSynchronosShared.Metrics;
+
+namespace MareSynchronosShared.Services;
+
+public abstract class BaseClientIdentificationService : IClientIdentificationService
+{
+    private readonly MareMetrics metrics;
+    protected ConcurrentDictionary<string, string> OnlineClients = new();
+    protected BaseClientIdentificationService(MareMetrics metrics)
+    {
+        this.metrics = metrics;
+    }
+
+    public virtual int GetOnlineUsers()
+    {
+        return OnlineClients.Count;
+    }
+
+    public string? GetUidForCharacterIdent(string characterIdent)
+    {
+        var result = OnlineClients.SingleOrDefault(u =>
+            string.Compare(u.Value, characterIdent, StringComparison.InvariantCultureIgnoreCase) == 0);
+        return result.Equals(new KeyValuePair<string, string>()) ? null : result.Key;
+    }
+
+    public virtual string? GetCharacterIdentForUid(string uid)
+    {
+        if (!OnlineClients.TryGetValue(uid, out var result))
+        {
+            return null;
+        }
+
+        return result;
+    }
+
+    public virtual void MarkUserOnline(string uid, string charaIdent)
+    {
+        OnlineClients[uid] = charaIdent;
+        metrics.SetGaugeTo(MetricsAPI.GaugeAuthorizedConnections, OnlineClients.Count);
+    }
+
+    public virtual void MarkUserOffline(string uid)
+    {
+        if (OnlineClients.TryRemove(uid, out _))
+        {
+            metrics.SetGaugeTo(MetricsAPI.GaugeAuthorizedConnections, OnlineClients.Count);
+        }
+    }
+
+    public Task StartAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+
+    public virtual Task StopAsync(CancellationToken cancellationToken)
+    {
+        metrics.SetGaugeTo(MetricsAPI.GaugeAuthorizedConnections, 0);
+        OnlineClients = new();
+        return Task.CompletedTask;
+    }
+}