instance template sweeper (#4718) (#3177)

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/4718.txt

@@ -0,0 +1,2 @@
+```release-note:none
+```

google-beta/resource_compute_instance_template_sweeper_test.go

@@ -0,0 +1,71 @@
+package google
+
+import (
+	"context"
+	"log"
+
+	"github.com/hashicorp/terraform-plugin-sdk/v2/helper/resource"
+)
+
+// This will sweep Compute Instance Templates
+func init() {
+	resource.AddTestSweepers("ComputeInstanceTemplate", &resource.Sweeper{
+		Name: "ComputeInstanceTemplate",
+		F:    testSweepComputeInstanceTemplate,
+	})
+}
+
+// At the time of writing, the CI only passes us-central1 as the region
+func testSweepComputeInstanceTemplate(region string) error {
+	resourceName := "ComputeInstanceTemplate"
+	log.Printf("[INFO][SWEEPER_LOG] Starting sweeper for %s", resourceName)
+
+	config, err := sharedConfigForRegion(region)
+	if err != nil {
+		log.Printf("[INFO][SWEEPER_LOG] error getting shared config for region: %s", err)
+		return err
+	}
+
+	err = config.LoadAndValidate(context.Background())
+	if err != nil {
+		log.Printf("[INFO][SWEEPER_LOG] error loading: %s", err)
+		return err
+	}
+
+	instanceTemplates, err := config.NewComputeBetaClient(config.userAgent).InstanceTemplates.List(config.Project).Do()
+	if err != nil {
+		log.Printf("[INFO][SWEEPER_LOG] Error in response from request instance templates LIST: %s", err)
+		return nil
+	}
+
+	numTemplates := len(instanceTemplates.Items)
+	if numTemplates == 0 {
+		log.Printf("[INFO][SWEEPER_LOG] Nothing found in response.")
+		return nil
+	}
+
+	log.Printf("[INFO][SWEEPER_LOG] Found %d items in %s list response.", numTemplates, resourceName)
+	// Count items that weren't sweeped.
+	nonPrefixCount := 0
+	for _, instanceTemplate := range instanceTemplates.Items {
+		// Increment count and skip if resource is not sweepable.
+		if !isSweepableTestResource(instanceTemplate.Name) {
+			nonPrefixCount++
+			continue
+		}
+
+		// Don't wait on operations as we may have a lot to delete
+		_, err := config.NewComputeBetaClient(config.userAgent).InstanceTemplates.Delete(config.Project, instanceTemplate.Name).Do()
+		if err != nil {
+			log.Printf("[INFO][SWEEPER_LOG] Error deleting instance template: %s", instanceTemplate.Name)
+		} else {
+			log.Printf("[INFO][SWEEPER_LOG] Sent delete request for %s resource: %s", resourceName, instanceTemplate.Name)
+		}
+	}
+
+	if nonPrefixCount > 0 {
+		log.Printf("[INFO][SWEEPER_LOG] %d items without tf-test prefix remain.", nonPrefixCount)
+	}
+
+	return nil
+}