feat: implement gRPC AgentService, Program.cs with Kestrel HTTP/2 config

Backend/src/NexusRMM.Api/Controllers/AgentsController.cs

@@ -0,0 +1,43 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using NexusRMM.Infrastructure.Data;
+
+namespace NexusRMM.Api.Controllers;
+
+[ApiController]
+[Route("api/v1/[controller]")]
+public class AgentsController : ControllerBase
+{
+    private readonly RmmDbContext _db;
+    public AgentsController(RmmDbContext db) => _db = db;
+
+    [HttpGet]
+    public async Task<IActionResult> GetAll()
+    {
+        var agents = await _db.Agents
+            .OrderBy(a => a.Hostname)
+            .Select(a => new { a.Id, a.Hostname, a.OsType, a.OsVersion, a.IpAddress, a.Status, a.AgentVersion, a.LastSeen, a.Tags })
+            .ToListAsync();
+        return Ok(agents);
+    }
+
+    [HttpGet("{id:guid}")]
+    public async Task<IActionResult> GetById(Guid id)
+    {
+        var agent = await _db.Agents.FindAsync(id);
+        return agent is null ? NotFound() : Ok(agent);
+    }
+
+    [HttpGet("{id:guid}/metrics")]
+    public async Task<IActionResult> GetMetrics(Guid id, [FromQuery] int hours = 24)
+    {
+        var since = DateTime.UtcNow.AddHours(-hours);
+        var metrics = await _db.AgentMetrics
+            .Where(m => m.AgentId == id && m.Timestamp >= since)
+            .OrderByDescending(m => m.Timestamp)
+            .Take(1000)
+            .Select(m => new { m.Timestamp, m.Metrics })
+            .ToListAsync();
+        return Ok(metrics);
+    }
+}

Backend/src/NexusRMM.Api/Controllers/TasksController.cs

@@ -0,0 +1,51 @@
+using System.Text.Json;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using NexusRMM.Core.Models;
+using NexusRMM.Infrastructure.Data;
+
+namespace NexusRMM.Api.Controllers;
+
+[ApiController]
+[Route("api/v1/[controller]")]
+public class TasksController : ControllerBase
+{
+    private readonly RmmDbContext _db;
+    public TasksController(RmmDbContext db) => _db = db;
+
+    [HttpPost]
+    public async Task<IActionResult> Create([FromBody] CreateTaskRequest request)
+    {
+        var task = new TaskItem
+        {
+            Id = Guid.NewGuid(),
+            AgentId = request.AgentId,
+            Type = request.Type,
+            Payload = request.Payload is not null ? JsonSerializer.SerializeToElement(request.Payload) : null,
+            CreatedAt = DateTime.UtcNow
+        };
+        _db.Tasks.Add(task);
+        await _db.SaveChangesAsync();
+        return CreatedAtAction(nameof(GetById), new { id = task.Id }, task);
+    }
+
+    [HttpGet("{id:guid}")]
+    public async Task<IActionResult> GetById(Guid id)
+    {
+        var task = await _db.Tasks.FindAsync(id);
+        return task is null ? NotFound() : Ok(task);
+    }
+
+    [HttpGet("agent/{agentId:guid}")]
+    public async Task<IActionResult> GetByAgent(Guid agentId)
+    {
+        var tasks = await _db.Tasks
+            .Where(t => t.AgentId == agentId)
+            .OrderByDescending(t => t.CreatedAt)
+            .Take(50)
+            .ToListAsync();
+        return Ok(tasks);
+    }
+}
+
+public record CreateTaskRequest(Guid AgentId, TaskType Type, object? Payload);

Backend/src/NexusRMM.Api/Controllers/TicketsController.cs

@@ -0,0 +1,64 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+using NexusRMM.Core.Models;
+using NexusRMM.Infrastructure.Data;
+
+namespace NexusRMM.Api.Controllers;
+
+[ApiController]
+[Route("api/v1/[controller]")]
+public class TicketsController : ControllerBase
+{
+    private readonly RmmDbContext _db;
+    public TicketsController(RmmDbContext db) => _db = db;
+
+    [HttpGet]
+    public async Task<IActionResult> GetAll([FromQuery] TicketStatus? status = null)
+    {
+        var query = _db.Tickets.AsQueryable();
+        if (status.HasValue) query = query.Where(t => t.Status == status.Value);
+        var tickets = await query.OrderByDescending(t => t.CreatedAt).Take(100).ToListAsync();
+        return Ok(tickets);
+    }
+
+    [HttpGet("{id:int}")]
+    public async Task<IActionResult> GetById(int id)
+    {
+        var ticket = await _db.Tickets.Include(t => t.Agent).FirstOrDefaultAsync(t => t.Id == id);
+        return ticket is null ? NotFound() : Ok(ticket);
+    }
+
+    [HttpPost]
+    public async Task<IActionResult> Create([FromBody] CreateTicketRequest request)
+    {
+        var ticket = new Ticket
+        {
+            Title = request.Title,
+            Description = request.Description,
+            Priority = request.Priority,
+            AgentId = request.AgentId,
+            CreatedAt = DateTime.UtcNow,
+            UpdatedAt = DateTime.UtcNow
+        };
+        _db.Tickets.Add(ticket);
+        await _db.SaveChangesAsync();
+        return CreatedAtAction(nameof(GetById), new { id = ticket.Id }, ticket);
+    }
+
+    [HttpPut("{id:int}")]
+    public async Task<IActionResult> Update(int id, [FromBody] UpdateTicketRequest request)
+    {
+        var ticket = await _db.Tickets.FindAsync(id);
+        if (ticket is null) return NotFound();
+        if (request.Status.HasValue) ticket.Status = request.Status.Value;
+        if (request.Priority.HasValue) ticket.Priority = request.Priority.Value;
+        if (request.Title is not null) ticket.Title = request.Title;
+        if (request.Description is not null) ticket.Description = request.Description;
+        ticket.UpdatedAt = DateTime.UtcNow;
+        await _db.SaveChangesAsync();
+        return Ok(ticket);
+    }
+}
+
+public record CreateTicketRequest(string Title, string Description, TicketPriority Priority, Guid? AgentId);
+public record UpdateTicketRequest(string? Title, string? Description, TicketStatus? Status, TicketPriority? Priority);

Backend/src/NexusRMM.Api/GrpcServices/AgentGrpcService.cs

@@ -0,0 +1,117 @@
+using System.Text.Json;
+using Grpc.Core;
+using Microsoft.EntityFrameworkCore;
+using NexusRMM.Core.Models;
+using NexusRMM.Infrastructure.Data;
+using NexusRMM.Protos;
+using AgentModel = NexusRMM.Core.Models.Agent;
+using CoreTaskStatus = NexusRMM.Core.Models.TaskStatus;
+
+namespace NexusRMM.Api.GrpcServices;
+
+public class AgentGrpcService : AgentService.AgentServiceBase
+{
+    private readonly RmmDbContext _db;
+    private readonly ILogger<AgentGrpcService> _logger;
+
+    public AgentGrpcService(RmmDbContext db, ILogger<AgentGrpcService> logger)
+    {
+        _db = db;
+        _logger = logger;
+    }
+
+    public override async Task<EnrollResponse> Enroll(EnrollRequest request, ServerCallContext context)
+    {
+        var agent = new AgentModel
+        {
+            Id = Guid.NewGuid(),
+            Hostname = request.Hostname,
+            OsType = request.OsType.ToLower() == "windows" ? OsType.Windows : OsType.Linux,
+            OsVersion = request.OsVersion,
+            IpAddress = request.IpAddress,
+            MacAddress = request.MacAddress,
+            AgentVersion = request.AgentVersion,
+            Status = AgentStatus.Online,
+            LastSeen = DateTime.UtcNow,
+            EnrolledAt = DateTime.UtcNow
+        };
+
+        _db.Agents.Add(agent);
+        await _db.SaveChangesAsync();
+        _logger.LogInformation("Agent enrolled: {AgentId} ({Hostname})", agent.Id, agent.Hostname);
+
+        return new EnrollResponse
+        {
+            AgentId = agent.Id.ToString(),
+            HeartbeatInterval = 60
+        };
+    }
+
+    public override async Task<HeartbeatResponse> Heartbeat(HeartbeatRequest request, ServerCallContext context)
+    {
+        var agentId = Guid.Parse(request.AgentId);
+        var agent = await _db.Agents.FindAsync(agentId)
+            ?? throw new RpcException(new Status(StatusCode.NotFound, "Agent not found"));
+
+        agent.LastSeen = DateTime.UtcNow;
+        agent.Status = AgentStatus.Online;
+
+        _db.AgentMetrics.Add(new AgentMetric
+        {
+            AgentId = agentId,
+            Timestamp = DateTime.UtcNow,
+            Metrics = JsonSerializer.SerializeToElement(request.Metrics)
+        });
+
+        var pendingTasks = await _db.Tasks
+            .Where(t => t.AgentId == agentId && t.Status == CoreTaskStatus.Pending)
+            .OrderBy(t => t.CreatedAt)
+            .Take(10)
+            .ToListAsync();
+
+        var response = new HeartbeatResponse();
+        foreach (var task in pendingTasks)
+        {
+            task.Status = CoreTaskStatus.InProgress;
+            response.PendingCommands.Add(new AgentCommand
+            {
+                CommandId = task.Id.ToString(),
+                Type = MapTaskType(task.Type),
+                Payload = task.Payload?.GetRawText() ?? "{}"
+            });
+        }
+
+        await _db.SaveChangesAsync();
+        return response;
+    }
+
+    public override async Task<CommandResultResponse> ReportCommandResult(CommandResult request, ServerCallContext context)
+    {
+        var taskId = Guid.Parse(request.CommandId);
+        var task = await _db.Tasks.FindAsync(taskId)
+            ?? throw new RpcException(new Status(StatusCode.NotFound, "Task not found"));
+
+        task.Status = request.Success ? CoreTaskStatus.Completed : CoreTaskStatus.Failed;
+        task.CompletedAt = DateTime.UtcNow;
+        task.Result = JsonSerializer.SerializeToElement(new
+        {
+            request.ExitCode,
+            request.Stdout,
+            request.Stderr,
+            request.Success
+        });
+
+        await _db.SaveChangesAsync();
+        return new CommandResultResponse();
+    }
+
+    private static CommandType MapTaskType(NexusRMM.Core.Models.TaskType type) => type switch
+    {
+        NexusRMM.Core.Models.TaskType.Shell => CommandType.Shell,
+        NexusRMM.Core.Models.TaskType.InstallSoftware => CommandType.InstallSoftware,
+        NexusRMM.Core.Models.TaskType.UninstallSoftware => CommandType.UninstallSoftware,
+        NexusRMM.Core.Models.TaskType.UpdateAgent => CommandType.UpdateAgent,
+        NexusRMM.Core.Models.TaskType.NetworkScan => CommandType.NetworkScan,
+        _ => CommandType.Unspecified
+    };
+}

Backend/src/NexusRMM.Api/NexusRMM.Api.csproj

@@ -17,6 +17,9 @@
   <ItemGroup>
     <PackageReference Include="Grpc.AspNetCore" Version="2.76.0" />
     <PackageReference Include="Microsoft.AspNetCore.SignalR" Version="1.2.9" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="10.0.5" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="10.0.5" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="7.5.0" />
   </ItemGroup>
 
 </Project>

Backend/src/NexusRMM.Api/Program.cs

@@ -1,20 +1,47 @@
+using Microsoft.AspNetCore.Server.Kestrel.Core;
+using Microsoft.EntityFrameworkCore;
+using NexusRMM.Api.GrpcServices;
+using NexusRMM.Infrastructure.Data;
+
 var builder = WebApplication.CreateBuilder(args);
 
-// Add services to the container.
+// Kestrel: Port 5000 für REST+SignalR (HTTP/1.1+2), Port 5001 für gRPC (HTTP/2)
+builder.WebHost.ConfigureKestrel(options =>
+{
+    options.ListenAnyIP(5000, o => o.Protocols = HttpProtocols.Http1AndHttp2);
+    options.ListenAnyIP(5001, o => o.Protocols = HttpProtocols.Http2);
+});
 
+builder.Services.AddDbContext<RmmDbContext>(options =>
+    options.UseNpgsql(builder.Configuration.GetConnectionString("DefaultConnection")));
+
+builder.Services.AddGrpc();
+builder.Services.AddSignalR();
 builder.Services.AddControllers();
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+builder.Services.AddCors(options =>
+{
+    options.AddDefaultPolicy(policy =>
+    {
+        policy.WithOrigins(builder.Configuration.GetSection("Cors:Origins").Get<string[]>() ?? ["http://localhost:5173"])
+              .AllowAnyHeader()
+              .AllowAnyMethod()
+              .AllowCredentials();
+    });
+});
 
 var app = builder.Build();
 
-// Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {
+    app.UseSwagger();
+    app.UseSwaggerUI();
 }
 
-app.UseHttpsRedirection();
+app.UseCors();
-
+app.MapGrpcService<AgentGrpcService>();
-app.UseAuthorization();
-
 app.MapControllers();
 
 app.Run();

Backend/src/NexusRMM.Api/appsettings.json

@@ -1,4 +1,10 @@
 {
+  "ConnectionStrings": {
+    "DefaultConnection": "Host=localhost;Port=5432;Database=nexusrmm;Username=nexusrmm;Password=nexusrmm_dev"
+  },
+  "Cors": {
+    "Origins": ["http://localhost:5173"]
+  },
   "Logging": {
     "LogLevel": {
       "Default": "Information",