provider/scaleway speedup server deletion (hashicorp#9491)

* provider/scaleway speedup server deletion

using `terminate` instead of `poweroff` leads to a faster shutdown

fixes hashicorp#9430

* provider/scaleway: extract server shutdown code

builtin/providers/scaleway/helpers.go

@@ -1,9 +1,11 @@
 package scaleway
 
 import (
+	"fmt"
 	"log"
 	"time"
 
+	"github.com/hashicorp/terraform/helper/resource"
 	"github.com/scaleway/scaleway-cli/pkg/api"
 )
 
@@ -17,36 +19,55 @@ func String(val string) *string {
 	return &val
 }
 
-// NOTE copied from github.com/scaleway/scaleway-cli/pkg/api/helpers.go
-// the helpers.go file pulls in quite a lot dependencies, and they're just convenience wrappers anyway
+// deleteRunningServer terminates the server and waits until it is removed.
+func deleteRunningServer(scaleway *api.ScalewayAPI, server *api.ScalewayServer) error {
+	err := scaleway.PostServerAction(server.Identifier, "terminate")
 
-func deleteServerSafe(s *api.ScalewayAPI, serverID string) error {
-	server, err := s.GetServer(serverID)
 	if err != nil {
+		if serr, ok := err.(api.ScalewayAPIError); ok {
+			if serr.StatusCode == 404 {
+				return nil
+			}
+		}
+
 		return err
 	}
 
-	if server.State != "stopped" {
-		if err := s.PostServerAction(serverID, "poweroff"); err != nil {
-			return err
+	return resource.Retry(5*time.Minute, func() *resource.RetryError {
+		_, err := scaleway.GetServer(server.Identifier)
+
+		if err == nil {
+			return resource.RetryableError(fmt.Errorf("Waiting for server %q to be deleted", server.Identifier))
 		}
-		if err := waitForServerState(s, serverID, "stopped"); err != nil {
-			return err
+
+		if serr, ok := err.(api.ScalewayAPIError); ok {
+			if serr.StatusCode == 404 {
+				return nil
+			}
 		}
-	}
 
-	if err := s.DeleteServer(serverID); err != nil {
+		return resource.RetryableError(err)
+	})
+}
+
+// deleteStoppedServer needs to cleanup attached root volumes. this is not done
+// automatically by Scaleway
+func deleteStoppedServer(scaleway *api.ScalewayAPI, server *api.ScalewayServer) error {
+	if err := scaleway.DeleteServer(server.Identifier); err != nil {
 		return err
 	}
+
 	if rootVolume, ok := server.Volumes["0"]; ok {
-		if err := s.DeleteVolume(rootVolume.Identifier); err != nil {
+		if err := scaleway.DeleteVolume(rootVolume.Identifier); err != nil {
 			return err
 		}
 	}
-
 	return nil
 }
 
+// NOTE copied from github.com/scaleway/scaleway-cli/pkg/api/helpers.go
+// the helpers.go file pulls in quite a lot dependencies, and they're just convenience wrappers anyway
+
 func waitForServerState(s *api.ScalewayAPI, serverID string, targetState string) error {
 	var server *api.ScalewayServer
 	var err error

builtin/providers/scaleway/resource_scaleway_server.go

@@ -205,22 +205,20 @@ func resourceScalewayServerUpdate(d *schema.ResourceData, m interface{}) error {
 func resourceScalewayServerDelete(d *schema.ResourceData, m interface{}) error {
 	scaleway := m.(*Client).scaleway
 
-	def, err := scaleway.GetServer(d.Id())
+	s, err := scaleway.GetServer(d.Id())
 	if err != nil {
-		if serr, ok := err.(api.ScalewayAPIError); ok {
-			if serr.StatusCode == 404 {
-				d.SetId("")
-				return nil
-			}
-		}
 		return err
 	}
 
-	err = deleteServerSafe(scaleway, def.Identifier)
-	if err != nil {
-		return err
+	if s.State == "stopped" {
+		return deleteStoppedServer(scaleway, s)
 	}
 
-	d.SetId("")
-	return nil
+	err = deleteRunningServer(scaleway, s)
+
+	if err == nil {
+		d.SetId("")
+	}
+
+	return err
 }