feat(iot): add WaitForHub IoT helper

Signed-off-by: Clément Decoodt <cdecoodt@online.net>

api/iot/v1beta1/iot_helpers.go

@@ -0,0 +1,56 @@
+package iot
+
+import (
+	"time"
+
+	"github.com/scaleway/scaleway-sdk-go/internal/async"
+	"github.com/scaleway/scaleway-sdk-go/internal/errors"
+	"github.com/scaleway/scaleway-sdk-go/scw"
+)
+
+const (
+	waitForHubDefaultTimeout = 15 * time.Minute
+	defaultRetryInterval     = 5 * time.Second
+)
+
+// WaitForHubRequest is used by WaitForHub method.
+type WaitForHubRequest struct {
+	HubID         string
+	Region        scw.Region
+	Status        HubStatus
+	Timeout       *time.Duration
+	RetryInterval *time.Duration
+}
+
+// WaitForHub waits for the hub to be in a ready state before returning.
+func (s *API) WaitForHub(req *WaitForHubRequest) (*Hub, error) {
+	timeout := *req.Timeout
+	if timeout == 0 {
+		timeout = waitForHubDefaultTimeout
+	}
+	retryInterval := defaultRetryInterval
+	if req.RetryInterval != nil {
+		retryInterval = *req.RetryInterval
+	}
+
+	hub, err := async.WaitSync(&async.WaitSyncConfig{
+		Get: func() (interface{}, bool, error) {
+			hub, err := s.GetHub(&GetHubRequest{
+				HubID:  req.HubID,
+				Region: req.Region,
+			})
+			if err != nil {
+				return nil, false, err
+			}
+
+			return hub, hub.Status == HubStatusReady, nil
+		},
+		Timeout:          timeout,
+		IntervalStrategy: async.LinearIntervalStrategy(retryInterval),
+	})
+	if err != nil {
+		return nil, errors.Wrap(err, "waiting for hub failed")
+	}
+
+	return hub.(*Hub), nil
+}