Implementation of script debugger component with RPC via SignalR

LANCommander.Server.Services/PowerShell/ScriptDebugger.cs

@@ -0,0 +1,79 @@
+using System.Text.RegularExpressions;
+using LANCommander.SDK.PowerShell;
+using Microsoft.Extensions.Logging;
+
+namespace LANCommander.Server.Services.PowerShell;
+
+public class ScriptDebugger : IScriptDebugger
+{
+    public Func<IScriptDebugContext, Task>? OnStart;
+    public Func<IScriptDebugContext, Task>? OnBreak;
+    public Func<IScriptDebugContext, Task>? OnEnd;
+    public Func<IScriptDebugContext, LogLevel, string, Task>? OnOutput;
+    
+    private IDictionary<Guid, IScriptDebugContext?> _contexts = new Dictionary<Guid, IScriptDebugContext?>();
+    
+    private static readonly Regex TokenRegex = new(@"\{[^}]+\}", RegexOptions.Compiled);
+
+    public Guid CreateSession()
+    {
+        var sessionId = Guid.NewGuid();
+        
+        _contexts.Add(sessionId, null);
+        
+        return sessionId;
+    }
+    
+    public Task StartAsync(IScriptDebugContext context)
+    {
+        var latestSession = _contexts.FirstOrDefault(kvp => kvp.Value == null);
+        
+        context.SessionId = latestSession.Key;
+        _contexts[latestSession.Key] = context;
+        
+        return OnStart is null
+            ? Task.CompletedTask
+            : OnStart(context);
+    }
+
+    public Task EndAsync(IScriptDebugContext context)
+    {
+        _contexts.Remove(context.SessionId);
+        
+        return OnEnd is null
+            ? Task.CompletedTask
+            : OnEnd(context);
+    }
+
+    public Task BreakAsync(IScriptDebugContext context)
+    {
+        return OnBreak is null
+            ? Task.CompletedTask
+            : OnBreak(context);
+    }
+
+    public Task OutputAsync(IScriptDebugContext context, LogLevel level, string message, params object[] args)
+    {
+        if (OnOutput is null)
+            return Task.CompletedTask;
+        
+        return OnOutput(context, level, Format(message, args));
+    }
+
+    public async Task ExecuteAsync(Guid sessionId, string input)
+    {
+        if (_contexts.ContainsKey(sessionId))
+            await _contexts[sessionId]!.ExecuteAsync(input);
+    }
+
+    private string Format(string template, object?[] args)
+    {
+        if (args == null || args.Length == 0)
+            return template;
+        
+        int i = 0;
+        
+        return TokenRegex.Replace(template, _ => 
+            i < args.Length ? args[i++]?.ToString() ?? string.Empty : string.Empty);
+    }
+}