refactor: Use Action.WatchProgress

- remove homebrew waitForAction impl, delegate to Action.WatchProgress
- add internal HTTP debug mode (instrumented build only)

driver/hetzner_query.go

@@ -11,7 +11,15 @@ import (
 )
 
 func (d *Driver) getClient() *hcloud.Client {
-	return hcloud.NewClient(hcloud.WithToken(d.AccessToken), hcloud.WithApplication("docker-machine-driver", d.version))
+	opts := []hcloud.ClientOption{
+		hcloud.WithToken(d.AccessToken),
+		hcloud.WithApplication("docker-machine-driver", d.version),
+		hcloud.WithPollBackoffFunc(hcloud.ConstantBackoff(time.Duration(d.WaitOnPolling) * time.Second)),
+	}
+
+	opts = d.setupClientInstrumentation(opts)
+
+	return hcloud.NewClient(opts...)
 }
 
 func (d *Driver) getLocationNullable() (*hcloud.Location, error) {
@@ -166,25 +174,24 @@ func (d *Driver) getServerHandleNullable() (*hcloud.Server, error) {
 }
 
 func (d *Driver) waitForAction(a *hcloud.Action) error {
-	for {
-		act, _, err := d.getClient().Action.GetByID(context.Background(), a.ID)
-		if err != nil {
-			return errors.Wrap(err, "could not get client by ID")
-		}
-		if act == nil {
-			return fmt.Errorf("action not found: %v", a.ID)
-		}
-
-		if act.Status == hcloud.ActionStatusSuccess {
-			log.Debugf(" -> finished %s[%d]", act.Command, act.ID)
-			break
-		} else if act.Status == hcloud.ActionStatusRunning {
-			log.Debugf(" -> %s[%d]: %d %%", act.Command, act.ID, act.Progress)
-		} else if act.Status == hcloud.ActionStatusError {
-			return act.Error()
+	progress, done := d.getClient().Action.WatchProgress(context.Background(), a)
+
+	running := true
+	var ret error
+
+	for running {
+		select {
+		case <-done:
+			ret = <-done
+			running = false
+		case <-progress:
+			log.Debugf(" -> %s[%d]: %d %%", a.Command, a.ID, <-progress)
 		}
+	}
 
-		time.Sleep(time.Duration(d.WaitOnPolling) * time.Second)
+	if ret == nil {
+		log.Debugf(" -> finished %s[%d]", a.Command, a.ID)
 	}
-	return nil
+
+	return ret
 }

driver/instrumentation_impl.go

@@ -4,6 +4,8 @@ package driver
 
 import (
 	"encoding/json"
+	"github.com/hetznercloud/hcloud-go/v2/hcloud"
+	"os"
 	"runtime/debug"
 
 	"github.com/docker/machine/libmachine/log"
@@ -20,3 +22,18 @@ func instrumented[T any](input T) T {
 	log.Debugf("%v\n%v\n", string(debug.Stack()), string(j))
 	return input
 }
+
+type debugLogWriter struct {
+}
+
+func (x debugLogWriter) Write(data []byte) (int, error) {
+	log.Debug(string(data))
+	return len(data), nil
+}
+
+func (d *Driver) setupClientInstrumentation(opts []hcloud.ClientOption) []hcloud.ClientOption {
+	if os.Getenv("HETZNER_DRIVER_HTTP_DEBUG") == "42" {
+		opts = append(opts, hcloud.WithDebugWriter(debugLogWriter{}))
+	}
+	return opts
+}

driver/instrumentation_stub.go

@@ -2,8 +2,16 @@
 
 package driver
 
+import (
+	"github.com/hetznercloud/hcloud-go/v2/hcloud"
+)
+
 const runningInstrumented = false
 
 func instrumented[T any](input T) T {
 	return input
 }
+
+func (d *Driver) setupClientInstrumentation(opts []hcloud.ClientOption) []hcloud.ClientOption {
+	return opts
+}