feat(gateway): add paging support

CHANGELOG.md

@@ -5,6 +5,10 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+### Added
+
+- Gateway: add paging support to `GetGateways` method.
+
 ## [8.2.0]
 
 ### Added

upcloud/request/gateway.go

@@ -10,14 +10,21 @@ const gatewayBaseURL string = "/gateway"
 
 type GetGatewaysRequest struct {
 	Filters []QueryFilter
+	Page    *Page
 }
 
 func (r *GetGatewaysRequest) RequestURL() string {
-	if len(r.Filters) == 0 {
+	f := make([]QueryFilter, len(r.Filters))
+	copy(f, r.Filters)
+	if r.Page != nil {
+		f = append(f, r.Page)
+	}
+
+	if len(f) == 0 {
 		return gatewayBaseURL
 	}
 
-	return fmt.Sprintf("%s?%s", gatewayBaseURL, encodeQueryFilters(r.Filters))
+	return fmt.Sprintf("%s?%s", gatewayBaseURL, encodeQueryFilters(f))
 }
 
 type GetGatewayRequest struct {

upcloud/request/gateway_test.go

@@ -13,18 +13,35 @@ func TestGetGatewaysRequest(t *testing.T) {
 	r := GetGatewaysRequest{}
 	assert.Equal(t, "/gateway", r.RequestURL())
 
-	r = GetGatewaysRequest{
-		Filters: []QueryFilter{
-			FilterLabel{
-				Label: upcloud.Label{
-					Key:   "color",
-					Value: "green",
-				},
+	filters := []QueryFilter{
+		FilterLabel{
+			Label: upcloud.Label{
+				Key:   "color",
+				Value: "green",
 			},
-			FilterLabelKey{Key: "size"},
 		},
+		FilterLabelKey{Key: "size"},
+	}
+
+	r = GetGatewaysRequest{
+		Filters: filters,
 	}
 	assert.Equal(t, "/gateway?label=color%3Dgreen&label=size", r.RequestURL())
+
+	page := &Page{
+		Size:   15,
+		Number: 3,
+	}
+	r = GetGatewaysRequest{
+		Page: page,
+	}
+	assert.Equal(t, "/gateway?limit=15&offset=30", r.RequestURL())
+
+	r = GetGatewaysRequest{
+		Filters: filters,
+		Page:    page,
+	}
+	assert.Equal(t, "/gateway?label=color%3Dgreen&label=size&limit=15&offset=30", r.RequestURL())
 }
 
 func TestGetGatewayRequest(t *testing.T) {