fix: avoid checking for the reaper out of its mutex (#1692)

docker.go

@@ -877,18 +877,13 @@ func (p *DockerProvider) CreateContainer(ctx context.Context, req ContainerReque
 		opt(&reaperOpts)
 	}
 
-	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
-
 	tcConfig := p.Config().Config
 
 	var termSignal chan bool
 	// the reaper does not need to start a reaper for itself
 	isReaperContainer := strings.EqualFold(req.Image, reaperImage(reaperOpts.ImageName))
 	if !tcConfig.RyukDisabled && !isReaperContainer {
-		r, err := reuseOrCreateReaper(context.WithValue(ctx, testcontainersdocker.DockerHostContextKey, p.host), sessionID, p, req.ReaperOptions...)
+		r, err := reuseOrCreateReaper(context.WithValue(ctx, testcontainersdocker.DockerHostContextKey, p.host), testcontainerssession.SessionID(), p, req.ReaperOptions...)
 		if err != nil {
 			return nil, fmt.Errorf("%w: creating reaper failed", err)
 		}
@@ -972,7 +967,7 @@ func (p *DockerProvider) CreateContainer(ctx context.Context, req ContainerReque
 
 	if !isReaperContainer {
 		// add the labels that the reaper will use to terminate the container to the request
-		for k, v := range testcontainersdocker.DefaultLabels(sessionID) {
+		for k, v := range testcontainersdocker.DefaultLabels(testcontainerssession.SessionID()) {
 			req.Labels[k] = v
 		}
 	}
@@ -1077,7 +1072,7 @@ func (p *DockerProvider) CreateContainer(ctx context.Context, req ContainerReque
 		WaitingFor:        req.WaitingFor,
 		Image:             tag,
 		imageWasBuilt:     req.ShouldBuildImage(),
-		sessionID:         sessionID,
+		sessionID:         testcontainerssession.SessionID(),
 		provider:          p,
 		terminationSignal: termSignal,
 		stopProducer:      nil,
@@ -1125,9 +1120,6 @@ func (p *DockerProvider) ReuseOrCreateContainer(ctx context.Context, req Contain
 	}
 
 	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
 
 	tcConfig := p.Config().Config
 
@@ -1298,9 +1290,6 @@ func (p *DockerProvider) CreateNetwork(ctx context.Context, req NetworkRequest)
 	}
 
 	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
 
 	var termSignal chan bool
 	if !tcConfig.RyukDisabled {
@@ -1406,17 +1395,12 @@ func (p *DockerProvider) getDefaultNetwork(ctx context.Context, cli client.APICl
 		}
 	}
 
-	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
-
 	// Create a bridge network for the container communications
 	if !reaperNetworkExists {
 		_, err = cli.NetworkCreate(ctx, reaperNetwork, types.NetworkCreate{
 			Driver:     Bridge,
 			Attachable: true,
-			Labels:     testcontainersdocker.DefaultLabels(sessionID),
+			Labels:     testcontainersdocker.DefaultLabels(testcontainerssession.SessionID()),
 		})
 
 		if err != nil {
@@ -1447,12 +1431,7 @@ func containerFromDockerResponse(ctx context.Context, response types.Container)
 	}
 	container.provider = provider
 
-	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
-
-	container.sessionID = sessionID
+	container.sessionID = testcontainerssession.SessionID()
 	container.consumers = []LogConsumer{}
 	container.stopProducer = nil
 	container.isRunning = response.State == "running"

reaper_test.go

@@ -134,9 +134,6 @@ func TestContainerStartsWithoutTheReaper(t *testing.T) {
 	terminateContainerOnEnd(t, ctx, container)
 
 	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
 
 	reaperContainer, err := lookUpReaperContainer(ctx, sessionID)
 	if err != nil {
@@ -172,9 +169,6 @@ func TestContainerStartsWithTheReaper(t *testing.T) {
 	terminateContainerOnEnd(t, ctx, c)
 
 	sessionID := testcontainerssession.SessionID()
-	if reaperInstance != nil {
-		sessionID = reaperInstance.SessionID
-	}
 
 	reaperContainer, err := lookUpReaperContainer(ctx, sessionID)
 	if err != nil {