Implement IpcCallerMare and hand Mare control of any handled pairs

MareSynchronos/Interop/Ipc/IpcCallerMare.cs

@@ -0,0 +1,44 @@
+using Dalamud.Plugin;
+using Dalamud.Plugin.Ipc;
+using MareSynchronos.Services;
+using MareSynchronos.Services.Mediator;
+using Microsoft.Extensions.Logging;
+
+namespace MareSynchronos.Interop.Ipc;
+
+public sealed class IpcCallerMare : DisposableMediatorSubscriberBase
+{
+    private readonly ICallGateSubscriber<List<nint>> _mareHandledGameAddresses;
+    private readonly List<nint> _emptyList = [];
+
+    private bool _pluginLoaded;
+
+    public IpcCallerMare(ILogger<IpcCallerMare> logger, IDalamudPluginInterface pi,  MareMediator mediator) : base(logger, mediator)
+    {
+        _mareHandledGameAddresses = pi.GetIpcSubscriber<List<nint>>("MareSynchronos.GetHandledAddresses");
+
+        _pluginLoaded = PluginWatcherService.GetInitialPluginState(pi, "MareSynchronos")?.IsLoaded ?? false;
+
+        Mediator.SubscribeKeyed<PluginChangeMessage>(this, "MareSynchronos", (msg) =>
+        {
+             _pluginLoaded = msg.IsLoaded;
+        });
+    }
+
+    public bool APIAvailable { get; private set; } = false;
+
+    // Must be called on framework thread
+    public IReadOnlyList<nint> GetHandledGameAddresses()
+    {
+        if (!_pluginLoaded) return _emptyList;
+
+        try
+        {
+            return _mareHandledGameAddresses.InvokeFunc();
+        }
+        catch
+        {
+            return _emptyList;
+        }
+    }
+}