triaging concurrent map access

Signed-off-by: Vasundhara Shukla <vasundharas@vmware.com>

Author: Vasundharashukla

examples/usecases/usecase1.tf

@@ -144,4 +144,4 @@ output "attach_output" {
 
 output "display_cluster" {
   value = tmc_cluster.create_tkgs_workload
-}
+}

internal/client/transport/methods.go

@@ -41,7 +41,7 @@ func (c *Client) invokeAction(httpMethodType string, url string, request Request
 		return errors.Wrap(err, "marshall request body")
 	}
 
-	headers := c.Headers
+	headers := c.Headers.Clone()
 	headers.Set(contentLengthKey, fmt.Sprintf("%d", len(body)))
 
 	var resp *http.Response

internal/client/transport/methods_test.go

@@ -0,0 +1,63 @@
+/*
+Copyright © 2021 VMware, Inc. All Rights Reserved.
+SPDX-License-Identifier: MPL-2.0
+*/
+
+package transport
+
+import (
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	workspacemodel "github.com/vmware-tanzu/terraform-provider-tanzu-mission-control/internal/models/workspace"
+)
+
+type Invoke struct {
+	HTTPMethodType string
+	URL            string
+	Request        Request
+	Response       Response
+}
+
+func TestConcurrentAccessOfInvokeAction(t *testing.T) {
+	var input Invoke
+
+	var waitGroup sync.WaitGroup
+
+	input.HTTPMethodType = "POST"
+	input.URL = "xyz.com"
+	input.Request = &workspacemodel.VmwareTanzuManageV1alpha1WorkspaceRequest{
+		Workspace: &workspacemodel.VmwareTanzuManageV1alpha1WorkspaceWorkspace{
+			FullName: &workspacemodel.VmwareTanzuManageV1alpha1WorkspaceFullName{
+				Name: "tf-workspace-test",
+			},
+		},
+	}
+	input.Response = &workspacemodel.VmwareTanzuManageV1alphaWorkspaceResponse{
+		Workspace: &workspacemodel.VmwareTanzuManageV1alpha1WorkspaceWorkspace{
+			FullName: &workspacemodel.VmwareTanzuManageV1alpha1WorkspaceFullName{
+				Name: "tf-workspace-test",
+			},
+		},
+	}
+
+	c := NewClient()
+	c.AddHeaders(map[string][]string{
+		"header1": {"one", "two"},
+		"header2": {"three", "four"},
+	})
+
+	for i := 1; i <= 100; i++ {
+		waitGroup.Add(1)
+
+		go func() {
+			defer waitGroup.Done()
+
+			actual := c.invokeAction(input.HTTPMethodType, input.URL, input.Request, input.Response)
+			require.Error(t, actual)
+		}()
+	}
+	waitGroup.Wait()
+}

internal/resources/cluster/manifest/helper.go

@@ -1,5 +1,5 @@
 /*
-Copyright (c) 2020 VMware, Inc. All rights reserved.
+Copyright (c) 2021 VMware, Inc. All rights reserved.
 
 Proprietary and confidential.