feat: get Region from Zone (#255)

Author: loicbourgois

scw/locality.go

@@ -2,13 +2,17 @@ package scw
 
 import (
 	"encoding/json"
+	"fmt"
 	"strings"
 
 	"github.com/scaleway/scaleway-sdk-go/internal/errors"
 	"github.com/scaleway/scaleway-sdk-go/logger"
 	"github.com/scaleway/scaleway-sdk-go/validation"
 )
 
+// localityPartsSeparator is the separator used in Zone and Region
+const localityPartsSeparator = "-"
+
 // Zone is an availability zone
 type Zone string
 
@@ -45,6 +49,17 @@ func (zone *Zone) String() string {
 	return string(*zone)
 }
 
+// Region returns the parent Region for the Zone.
+// Manipulates the string directly to allow unlisted zones formatted as xx-yyy-z.
+func (zone *Zone) Region() (Region, error) {
+	zoneStr := zone.String()
+	if !validation.IsZone(zoneStr) {
+		return "", fmt.Errorf("invalid zone '%v'", zoneStr)
+	}
+	zoneParts := strings.Split(zoneStr, localityPartsSeparator)
+	return Region(strings.Join(zoneParts[:2], localityPartsSeparator)), nil
+}
+
 // Region is a geographical location
 type Region string