Add endpoint for Tye application metadata (#1079)

* Sketch GET for control plane.

* Add properties to control plane metadata.

* Resolve linter warnings.

* Switch to /application endpoint.

* Change ID to Id.

src/Microsoft.Tye.Hosting/Model/Application.cs

@@ -12,14 +12,19 @@ namespace Microsoft.Tye.Hosting.Model
 {
     public class Application
     {
-        public Application(FileInfo source, Dictionary<string, Service> services, ContainerEngine containerEngine)
+        public Application(string name, FileInfo source, Dictionary<string, Service> services, ContainerEngine containerEngine)
         {
+            Name = name;
             Source = source.FullName;
             ContextDirectory = source.DirectoryName!;
             Services = services;
             ContainerEngine = containerEngine;
         }
 
+        public string Id { get; } = Guid.NewGuid().ToString();
+
+        public string Name { get; }
+
         public string Source { get; }
 
         public string ContextDirectory { get; }

src/Microsoft.Tye.Hosting/Model/V1/V1Application.cs

@@ -0,0 +1,15 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.Tye.Hosting.Model.V1
+{
+    public class V1Application
+    {
+        public string? Id { get; set; }
+
+        public string? Name { get; set; }
+
+        public string? Source { get; set; }
+    }
+}

src/Microsoft.Tye.Hosting/TyeDashboardApi.cs

@@ -37,6 +37,7 @@ namespace Microsoft.Tye.Hosting
         public void MapRoutes(IEndpointRouteBuilder endpoints)
         {
             endpoints.MapGet("/api/v1", ServiceIndex);
+            endpoints.MapGet("/api/v1/application", ApplicationIndex);
             endpoints.MapDelete("/api/v1/control", ControlPlaneShutdown);
             endpoints.MapGet("/api/v1/services", Services);
             endpoints.MapGet("/api/v1/services/{name}", Service);
@@ -50,15 +51,33 @@ namespace Microsoft.Tye.Hosting
             context.Response.ContentType = "application/json";
             return JsonSerializer.SerializeAsync(context.Response.Body, new[]
             {
+                $"{context.Request.Scheme}://{context.Request.Host}/api/v1/application",
                 $"{context.Request.Scheme}://{context.Request.Host}/api/v1/control",
-                $"{context.Request.Scheme}://{context.Request.Host}/api/v1/services",
                 $"{context.Request.Scheme}://{context.Request.Host}/api/v1/logs/{{service}}",
                 $"{context.Request.Scheme}://{context.Request.Host}/api/v1/metrics",
                 $"{context.Request.Scheme}://{context.Request.Host}/api/v1/metrics/{{service}}",
+                $"{context.Request.Scheme}://{context.Request.Host}/api/v1/services",
             },
             _options);
         }
 
+        private Task ApplicationIndex(HttpContext context)
+        {
+            var app = context.RequestServices.GetRequiredService<Application>();
+
+            context.Response.ContentType = "application/json";
+
+            return JsonSerializer.SerializeAsync(
+                context.Response.Body,
+                new V1Application
+                {
+                    Id = app.Id,
+                    Name = app.Name,
+                    Source = app.Source
+                },
+                _options);
+        }
+
         private Task ControlPlaneShutdown(HttpContext context)
         {
             var lifetime = context.RequestServices.GetRequiredService<IHostApplicationLifetime>();

src/tye/ApplicationBuilderExtensions.cs

@@ -213,7 +213,7 @@ namespace Microsoft.Tye
                 services.Add(ingress.Name, new Service(description));
             }
 
-            return new Application(application.Source, services, application.ContainerEngine) { Network = application.Network };
+            return new Application(application.Name, application.Source, services, application.ContainerEngine) { Network = application.Network };
         }
 
         public static Tye.Hosting.Model.EnvironmentVariable ToHostingEnvironmentVariable(this EnvironmentVariableBuilder builder)

test/Test.Infrastructure/TestHelpers.cs

@@ -251,8 +251,8 @@ namespace Test.Infrastructure
                 var processRunner = new ProcessRunner(logger, replicaRegistry, new ProcessRunnerOptions());
                 var dockerRunner = new DockerRunner(logger, replicaRegistry);
 
-                await processRunner.StartAsync(new Application(new FileInfo(host.Application.Source), new Dictionary<string, Service>(), ContainerEngine.Default));
+                await processRunner.StartAsync(new Application(host.Application.Name, new FileInfo(host.Application.Source), new Dictionary<string, Service>(), ContainerEngine.Default));
-                await dockerRunner.StartAsync(new Application(new FileInfo(host.Application.Source), new Dictionary<string, Service>(), ContainerEngine.Default));
+                await dockerRunner.StartAsync(new Application(host.Application.Name, new FileInfo(host.Application.Source), new Dictionary<string, Service>(), ContainerEngine.Default));
             }
 
             await DoOperationAndWaitForReplicasToChangeState(host, ReplicaState.Stopped, replicas.Length, replicas.ToHashSet(), new HashSet<string>(), TimeSpan.Zero, Purge);