Model Docker Compose as compute environment

src/Aspire.Hosting.Docker/DockerComposeEnvironmentExtensions.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Aspire.Hosting.ApplicationModel;
+using Aspire.Hosting.Docker;
+using Aspire.Hosting.Lifecycle;
+
+namespace Aspire.Hosting;
+
+/// <summary>
+/// Provides extension methods for adding Docker Compose environment resources to the application model.
+/// </summary>
+public static class DockerComposeEnvironmentExtensions
+{
+    /// <summary>
+    /// Adds a Docker Compose environment to the application model.
+    /// </summary>
+    /// <param name="builder">The <see cref="IDistributedApplicationBuilder"/>.</param>
+    /// <param name="name">The name of the Docker Compose environment resource.</param>
+    /// <returns>A reference to the <see cref="IResourceBuilder{DockerComposeEnvironmentResource}"/>.</returns>
+    public static IResourceBuilder<DockerComposeEnvironmentResource> AddDockerComposeEnvironment(
+        this IDistributedApplicationBuilder builder,
+        string name)
+    {
+        ArgumentNullException.ThrowIfNull(builder);
+        ArgumentException.ThrowIfNullOrEmpty(name);
+
+        var resource = new DockerComposeEnvironmentResource(name);
+        builder.Services.TryAddLifecycleHook<DockerComposeInfrastructure>();
+        builder.AddDockerComposePublisher(name);
+        return builder.AddResource(resource);
+    }
+}

src/Aspire.Hosting.Docker/DockerComposeEnvironmentResource.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Aspire.Hosting.ApplicationModel;
+
+namespace Aspire.Hosting.Docker;
+
+/// <summary>
+/// Represents a Docker Compose environment resource that can host application resources.
+/// </summary>
+/// <remarks>
+/// Initializes a new instance of the <see cref="DockerComposeEnvironmentResource"/> class.
+/// </remarks>
+/// <param name="name">The name of the Docker Compose environment.</param>
+public class DockerComposeEnvironmentResource(string name) : Resource(name)
+{
+    /// <summary>
+    /// Gets the collection of environment variables captured from the Docker Compose environment.
+    /// These will be populated into a top-level .env file adjacent to the Docker Compose file.
+    /// </summary>
+    internal Dictionary<string, (string Description, string? DefaultValue)> CapturedEnvironmentVariables { get; } = [];
+}

src/Aspire.Hosting.Docker/DockerComposeInfrastructure.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using Aspire.Hosting.ApplicationModel;
+using Aspire.Hosting.Lifecycle;
+using Aspire.Hosting.Publishing;
+using Microsoft.Extensions.Logging;
+
+namespace Aspire.Hosting.Docker;
+
+/// <summary>
+/// Represents the infrastructure for Docker Compose within the Aspire Hosting environment.
+/// Implements the <see cref="IDistributedApplicationLifecycleHook"/> interface to provide lifecycle hooks for distributed applications.
+/// </summary>
+internal sealed class DockerComposeInfrastructure(
+    ILogger<DockerComposeInfrastructure> logger,
+    DistributedApplicationExecutionContext executionContext) : IDistributedApplicationLifecycleHook
+{
+    public async Task BeforeStartAsync(DistributedApplicationModel appModel, CancellationToken cancellationToken = default)
+    {
+        if (executionContext.IsRunMode)
+        {
+            return;
+        }
+
+        // Find Docker Compose environment resources
+        var dockerComposeEnvironments = appModel.Resources.OfType<DockerComposeEnvironmentResource>().ToArray();
+
+        if (dockerComposeEnvironments.Length > 1)
+        {
+            throw new NotSupportedException("Multiple Docker Compose environments are not supported.");
+        }
+
+        var environment = dockerComposeEnvironments.FirstOrDefault();
+
+        if (environment == null)
+        {
+            return;
+        }
+
+        var dockerComposeEnvironmentContext = new DockerComposeEnvironmentContext(environment, logger);
+
+        foreach (var r in appModel.Resources)
+        {
+            if (r.TryGetLastAnnotation<ManifestPublishingCallbackAnnotation>(out var lastAnnotation) && lastAnnotation == ManifestPublishingCallbackAnnotation.Ignore)
+            {
+                continue;
+            }
+
+            // Skip resources that are not containers or projects
+            if (!r.IsContainer() && r is not ProjectResource)
+            {
+                continue;
+            }
+
+            // Create a Docker Compose compute resource for the resource
+            var serviceResource = await dockerComposeEnvironmentContext.CreateDockerComposeServiceResourceAsync(r, executionContext, cancellationToken).ConfigureAwait(false);
+
+            // Add deployment target annotation to the resource
+            r.Annotations.Add(new DeploymentTargetAnnotation(serviceResource));
+        }
+    }
+
+    internal sealed class DockerComposeEnvironmentContext(DockerComposeEnvironmentResource environment, ILogger logger)
+    {
+        private readonly Dictionary<IResource, DockerComposeServiceResource> _resourceMapping = [];
+        private readonly PortAllocator _portAllocator = new();
+
+        public async Task<DockerComposeServiceResource> CreateDockerComposeServiceResourceAsync(IResource resource, DistributedApplicationExecutionContext executionContext, CancellationToken cancellationToken)
+        {
+            if (_resourceMapping.TryGetValue(resource, out var existingResource))
+            {
+                return existingResource;
+            }
+
+            logger.LogInformation("Creating Docker Compose resource for {ResourceName}", resource.Name);
+
+            var serviceResource = new DockerComposeServiceResource(resource.Name, resource, environment);
+            _resourceMapping[resource] = serviceResource;
+
+            // Process endpoints
+            ProcessEndpoints(serviceResource);
+
+            // Process volumes
+            ProcessVolumes(serviceResource);
+
+            // Process environment variables
+            await ProcessEnvironmentVariablesAsync(serviceResource, executionContext, cancellationToken).ConfigureAwait(false);
+
+            // Process command line arguments
+            await ProcessArgumentsAsync(serviceResource, executionContext, cancellationToken).ConfigureAwait(false);
+
+            return serviceResource;
+        }
+
+        private void ProcessEndpoints(DockerComposeServiceResource serviceResource)
+        {
+            if (!serviceResource.TargetResource.TryGetEndpoints(out var endpoints))
+            {
+                return;
+            }
+
+            foreach (var endpoint in endpoints)
+            {
+                var internalPort = endpoint.TargetPort ?? _portAllocator.AllocatePort();
+                _portAllocator.AddUsedPort(internalPort);
+
+                var exposedPort = _portAllocator.AllocatePort();
+                _portAllocator.AddUsedPort(exposedPort);
+
+                serviceResource.EndpointMappings.Add(endpoint.Name, new(endpoint.UriScheme, serviceResource.TargetResource.Name, internalPort, exposedPort, false));
+            }
+        }
+
+        private static void ProcessVolumes(DockerComposeServiceResource serviceResource)
+        {
+            if (!serviceResource.TargetResource.TryGetContainerMounts(out var mounts))
+            {
+                return;
+            }
+
+            foreach (var mount in mounts)
+            {
+                if (mount.Source is null || mount.Target is null)
+                {
+                    throw new InvalidOperationException("Volume source and target must be set");
+                }
+
+                serviceResource.Volumes.Add(new Resources.ServiceNodes.Volume
+                {
+                    Name = mount.Source,
+                    Source = mount.Source,
+                    Target = mount.Target,
+                    Type = mount.Type == ContainerMountType.BindMount ? "bind" : "volume",
+                    ReadOnly = mount.IsReadOnly
+                });
+            }
+        }
+
+        private async Task ProcessEnvironmentVariablesAsync(DockerComposeServiceResource serviceResource, DistributedApplicationExecutionContext executionContext, CancellationToken cancellationToken)
+        {
+            if (serviceResource.TargetResource.TryGetAnnotationsOfType<EnvironmentCallbackAnnotation>(out var environmentCallbacks))
+            {
+                var context = new EnvironmentCallbackContext(executionContext, serviceResource.TargetResource, cancellationToken: cancellationToken);
+
+                foreach (var callback in environmentCallbacks)
+                {
+                    await callback.Callback(context).ConfigureAwait(false);
+                }
+
+                // Remove HTTPS service discovery variables as Docker Compose doesn't handle certificates
+                RemoveHttpsServiceDiscoveryVariables(context.EnvironmentVariables);
+
+                foreach (var kv in context.EnvironmentVariables)
+                {
+                    var value = await serviceResource.ProcessValueAsync(this, executionContext, kv.Value).ConfigureAwait(false);
+                    serviceResource.EnvironmentVariables.Add(kv.Key, value?.ToString() ?? string.Empty);
+                }
+            }
+        }
+
+        private static void RemoveHttpsServiceDiscoveryVariables(Dictionary<string, object> environmentVariables)
+        {
+            var keysToRemove = environmentVariables
+                .Where(kvp => kvp.Value is EndpointReference epRef && epRef.Scheme == "https" && kvp.Key.StartsWith("services__"))
+                .Select(kvp => kvp.Key)
+                .ToList();
+
+            foreach (var key in keysToRemove)
+            {
+                environmentVariables.Remove(key);
+            }
+        }
+
+        private async Task ProcessArgumentsAsync(DockerComposeServiceResource serviceResource, DistributedApplicationExecutionContext executionContext, CancellationToken cancellationToken)
+        {
+            if (serviceResource.TargetResource.TryGetAnnotationsOfType<CommandLineArgsCallbackAnnotation>(out var commandLineArgsCallbacks))
+            {
+                var context = new CommandLineArgsCallbackContext([], cancellationToken: cancellationToken);
+
+                foreach (var callback in commandLineArgsCallbacks)
+                {
+                    await callback.Callback(context).ConfigureAwait(false);
+                }
+
+                foreach (var arg in context.Args)
+                {
+                    var value = await serviceResource.ProcessValueAsync(this, executionContext, arg).ConfigureAwait(false);
+                    if (value is not string str)
+                    {
+                        throw new NotSupportedException("Command line args must be strings");
+                    }
+
+                    serviceResource.Commands.Add(str);
+                }
+            }
+        }
+
+        public void AddEnv(string name, string description, string? defaultValue = null)
+        {
+            environment.CapturedEnvironmentVariables[name] = (description, defaultValue);
+        }
+    }
+}