Gnocchi: add Delete method for Resource types

Implement Delete method in the resourcetypes package.
Add unit and acceptance tests with documentation.

acceptance/gnocchi/metric/v1/resourcetypes.go

@@ -43,3 +43,16 @@ func CreateResourceType(t *testing.T, client *gophercloud.ServiceClient) (*resou
 	t.Logf("Successfully created the Gnocchi resource type.")
 	return resourceType, nil
 }
+
+// DeleteResourceType deletes a Gnocchi resource type with the specified name.
+// A fatal error will occur if the delete was not successful.
+func DeleteResourceType(t *testing.T, client *gophercloud.ServiceClient, resourceTypeName string) {
+	t.Logf("Attempting to delete the Gnocchi resource type: %s", resourceTypeName)
+
+	err := resourcetypes.Delete(client, resourceTypeName).ExtractErr()
+	if err != nil {
+		t.Fatalf("Unable to delete the Gnocchi resource type %s: %v", resourceTypeName, err)
+	}
+
+	t.Logf("Deleted the Gnocchi resource type: %s", resourceTypeName)
+}

acceptance/gnocchi/metric/v1/resourcetypes_test.go

@@ -41,7 +41,7 @@ func TestResourceTypesCRUD(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Unable to create a Gnocchi resource type: %v", err)
 	}
-	// defer DeleteResourceType(t, client, resourceType.Name)
+	defer DeleteResourceType(t, client, resourceType.Name)
 
 	tools.PrintResource(t, resourceType)
 

gnocchi/metric/v1/resourcetypes/doc.go

@@ -89,5 +89,12 @@ Example of Updating a resource type
   if err != nil {
     panic(err)
   }
+
+Example of Deleting a resource type
+
+  err := resourcetypes.Delete(gnocchiClient, resourceType).ExtractErr()
+  if err != nil {
+    panic(err)
+  }
 */
 package resourcetypes

gnocchi/metric/v1/resourcetypes/requests.go

@@ -189,3 +189,14 @@ func Update(client *gophercloud.ServiceClient, resourceTypeName string, opts Upd
 	})
 	return
 }
+
+// Delete accepts a human-readable name and deletes the Gnocchi resource type associated with it.
+func Delete(c *gophercloud.ServiceClient, resourceTypeName string) (r DeleteResult) {
+	requestOpts := &gophercloud.RequestOpts{
+		MoreHeaders: map[string]string{
+			"Accept": "application/json, */*",
+		},
+	}
+	_, r.Err = c.Delete(deleteURL(c, resourceTypeName), requestOpts)
+	return
+}

gnocchi/metric/v1/resourcetypes/results.go

@@ -36,6 +36,12 @@ type UpdateResult struct {
 	commonResult
 }
 
+// DeleteResult represents the result of a delete operation. Call its
+// ExtractErr method to determine if the request succeeded or failed.
+type DeleteResult struct {
+	gophercloud.ErrResult
+}
+
 // ResourceType represents custom Gnocchi resource type.
 type ResourceType struct {
 	// Attributes is a collection of keys and values of different resource types.

gnocchi/metric/v1/resourcetypes/testing/requests_test.go

@@ -253,3 +253,17 @@ func TestUpdate(t *testing.T) {
 		},
 	})
 }
+
+func TestDelete(t *testing.T) {
+	th.SetupHTTP()
+	defer th.TeardownHTTP()
+
+	th.Mux.HandleFunc("/v1/resource_type/compute_instance_network", func(w http.ResponseWriter, r *http.Request) {
+		th.TestMethod(t, r, "DELETE")
+		th.TestHeader(t, r, "X-Auth-Token", fake.TokenID)
+		w.WriteHeader(http.StatusNoContent)
+	})
+
+	res := resourcetypes.Delete(fake.ServiceClient(), "compute_instance_network")
+	th.AssertNoErr(t, res.Err)
+}

gnocchi/metric/v1/resourcetypes/urls.go

@@ -27,3 +27,7 @@ func createURL(c *gophercloud.ServiceClient) string {
 func updateURL(c *gophercloud.ServiceClient, resourceTypeName string) string {
 	return resourceURL(c, resourceTypeName)
 }
+
+func deleteURL(c *gophercloud.ServiceClient, resourceTypeName string) string {
+	return resourceURL(c, resourceTypeName)
+}