up

src/Graph/StellaOps.Graph.Api/Program.cs

@@ -0,0 +1,56 @@
+using StellaOps.Graph.Api.Contracts;
+using StellaOps.Graph.Api.Services;
+
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddSingleton<InMemoryGraphRepository>();
+builder.Services.AddSingleton<IGraphSearchService, InMemoryGraphSearchService>();
+var app = builder.Build();
+
+app.UseRouting();
+
+app.MapPost("/graph/search", async (HttpContext context, GraphSearchRequest request, IGraphSearchService service, CancellationToken ct) =>
+{
+    context.Response.ContentType = "application/x-ndjson";
+    var tenant = context.Request.Headers["X-Stella-Tenant"].FirstOrDefault();
+    if (string.IsNullOrWhiteSpace(tenant))
+    {
+        await WriteError(context, StatusCodes.Status400BadRequest, "GRAPH_VALIDATION_FAILED", "Missing X-Stella-Tenant header", ct);
+        return Results.Empty;
+    }
+
+    if (!context.Request.Headers.ContainsKey("Authorization"))
+    {
+        await WriteError(context, StatusCodes.Status401Unauthorized, "GRAPH_UNAUTHORIZED", "Missing Authorization header", ct);
+        return Results.Empty;
+    }
+
+    var validation = SearchValidator.Validate(request);
+    if (validation is not null)
+    {
+        await WriteError(context, StatusCodes.Status400BadRequest, "GRAPH_VALIDATION_FAILED", validation, ct);
+        return Results.Empty;
+    }
+
+    await foreach (var line in service.SearchAsync(tenant!, request, ct))
+    {
+        await context.Response.WriteAsync(line, ct);
+        await context.Response.WriteAsync("\n", ct);
+        await context.Response.Body.FlushAsync(ct);
+    }
+
+    return Results.Empty;
+});
+
+app.Run();
+
+static async Task WriteError(HttpContext ctx, int status, string code, string message, CancellationToken ct)
+{
+    ctx.Response.StatusCode = status;
+    var payload = System.Text.Json.JsonSerializer.Serialize(new ErrorResponse
+    {
+        Error = code,
+        Message = message
+    });
+    await ctx.Response.WriteAsync(payload + "\n", ct);
+}