fix(#595): Implement TestcontainersContainer.DisposeAsync thread safe

CHANGELOG.md

@@ -23,6 +23,7 @@
 ### Fixed
 
 - 525 Read ServerURL, Username and Secret field from CredsStore response to pull private Docker images
+- 595 Implement `TestcontainersContainer.DisposeAsync` thread safe
 
 ## [2.1.0]
 

src/Testcontainers/Containers/TestcontainersContainer.cs

@@ -18,7 +18,7 @@ namespace DotNet.Testcontainers.Containers
   /// <inheritdoc cref="ITestcontainersContainer" />
   public class TestcontainersContainer : ITestcontainersContainer
   {
-    private static readonly TestcontainersState[] ContainerHasBeenCreatedStates = { TestcontainersState.Created, TestcontainersState.Running, TestcontainersState.Exited };
+    private const TestcontainersState ContainerHasBeenCreatedStates = TestcontainersState.Created | TestcontainersState.Running | TestcontainersState.Exited;
 
     private static readonly string[] DockerDesktopGateways = { "host.docker.internal", "gateway.docker.internal" };
 
@@ -28,6 +28,8 @@ public class TestcontainersContainer : ITestcontainersContainer
 
     private readonly ITestcontainersConfiguration configuration;
 
+    private int disposed;
+
     [NotNull]
     private ContainerInspectResponse container = new ContainerInspectResponse();
 
@@ -228,10 +230,10 @@ public Task<ExecResult> ExecAsync(IList<string> command, CancellationToken ct =
     }
 
     /// <summary>
-    /// Removes the Testcontainer.
+    /// Removes the Testcontainers.
     /// </summary>
     /// <param name="ct">Cancellation token.</param>
-    /// <returns>A task that represents the asynchronous clean up operation of a Testcontainer.</returns>
+    /// <returns>A task that represents the asynchronous clean up operation of a Testcontainers.</returns>
     public async Task CleanUpAsync(CancellationToken ct = default)
     {
       await this.semaphoreSlim.WaitAsync(ct)
@@ -251,31 +253,40 @@ await this.semaphoreSlim.WaitAsync(ct)
     /// <inheritdoc />
     public async ValueTask DisposeAsync()
     {
-      if (!ContainerHasBeenCreatedStates.Contains(this.State))
+      await this.DisposeAsyncCore()
+        .ConfigureAwait(false);
+
+      GC.SuppressFinalize(this);
+    }
+
+    /// <summary>
+    /// Releases any resources associated with the instance of <see cref="TestcontainersContainer" />.
+    /// </summary>
+    protected virtual async ValueTask DisposeAsyncCore()
+    {
+      if (1.Equals(Interlocked.CompareExchange(ref this.disposed, 1, 0)))
       {
         return;
       }
 
-      // If someone calls `DisposeAsync`, we can immediately remove the container. We don't need to wait for the Resource Reaper.
-      if (!Guid.Empty.Equals(this.configuration.SessionId))
+      // If someone calls `DisposeAsync`, we can immediately remove the container. We do not need to wait for the Resource Reaper.
+      if (Guid.Empty.Equals(this.configuration.SessionId))
       {
-        await this.CleanUpAsync()
+        await this.StopAsync()
           .ConfigureAwait(false);
       }
       else
       {
-        await this.StopAsync()
+        await this.CleanUpAsync()
           .ConfigureAwait(false);
       }
 
       this.semaphoreSlim.Dispose();
-
-      GC.SuppressFinalize(this);
     }
 
     private async Task<ContainerInspectResponse> Create(CancellationToken ct = default)
     {
-      if (ContainerHasBeenCreatedStates.Contains(this.State))
+      if (ContainerHasBeenCreatedStates.HasFlag(this.State))
       {
         return this.container;
       }
@@ -340,20 +351,21 @@ private async Task<ContainerInspectResponse> CleanUp(string id, CancellationToke
     {
       await this.client.RemoveAsync(id, ct)
         .ConfigureAwait(false);
+
       return new ContainerInspectResponse();
     }
 
     private void ThrowIfContainerHasNotBeenCreated()
     {
-      if (!ContainerHasBeenCreatedStates.Contains(this.State))
+      if (!ContainerHasBeenCreatedStates.HasFlag(this.State))
       {
-        throw new InvalidOperationException("Testcontainer has not been created.");
+        throw new InvalidOperationException("Testcontainers has not been created.");
       }
     }
 
     private string GetContainerGateway()
     {
-      if (!this.client.IsRunningInsideDocker || !ContainerHasBeenCreatedStates.Contains(this.State))
+      if (!this.client.IsRunningInsideDocker || !ContainerHasBeenCreatedStates.HasFlag(this.State))
       {
         return "localhost";
       }

src/Testcontainers/Containers/TestcontainersState.cs

@@ -1,53 +1,55 @@
 namespace DotNet.Testcontainers.Containers
 {
+  using System;
   using JetBrains.Annotations;
 
   /// <summary>
   /// Docker container states.
   /// </summary>
   [PublicAPI]
+  [Flags]
   public enum TestcontainersState
   {
     /// <summary>
-    /// Docker container was not created.
+    /// Docker container has not been created.
     /// </summary>
     [PublicAPI]
-    Undefined,
+    Undefined = -1,
 
     /// <summary>
     /// Docker container is created.
     /// </summary>
     [PublicAPI]
-    Created,
+    Created = 1,
 
     /// <summary>
     /// Docker container is restarting.
     /// </summary>
     [PublicAPI]
-    Restarting,
+    Restarting = 2,
 
     /// <summary>
     /// Docker container is running.
     /// </summary>
     [PublicAPI]
-    Running,
+    Running = 4,
 
     /// <summary>
     /// Docker container is paused.
     /// </summary>
     [PublicAPI]
-    Paused,
+    Paused = 8,
 
     /// <summary>
     /// Docker container is exited.
     /// </summary>
     [PublicAPI]
-    Exited,
+    Exited = 16,
 
     /// <summary>
     /// Docker container is dead.
     /// </summary>
     [PublicAPI]
-    Dead,
+    Dead = 32,
   }
 }