Small refactor for better readability and updated the docs

builtin/providers/cloudstack/resource_cloudstack_vpc.go

@@ -52,16 +52,16 @@ func resourceCloudStackVPC() *schema.Resource {
 				ForceNew: true,
 			},
 
+			"source_nat_ip": &schema.Schema{
+				Type:     schema.TypeString,
+				Computed: true,
+			},
+
 			"zone": &schema.Schema{
 				Type:     schema.TypeString,
 				Required: true,
 				ForceNew: true,
 			},
-
-			"source_nat_ip": &schema.Schema{
-				Type:     schema.TypeString,
-				Computed: true,
-			},
 		},
 	}
 }
@@ -157,19 +157,27 @@ func resourceCloudStackVPCRead(d *schema.ResourceData, meta interface{}) error {
 	setValueOrID(d, "project", v.Project, v.Projectid)
 	setValueOrID(d, "zone", v.Zonename, v.Zoneid)
 
-	// Grab the source NAT IP that CloudStack assigned.
+	// Create a new parameter struct
 	p := cs.Address.NewListPublicIpAddressesParams()
 	p.SetVpcid(d.Id())
 	p.SetIssourcenat(true)
+
 	if _, ok := d.GetOk("project"); ok {
 		p.SetProjectid(v.Projectid)
 	}
 
-	l, e := cs.Address.ListPublicIpAddresses(p)
-	if (e == nil) && (l.Count == 1) {
-		d.Set("source_nat_ip", l.PublicIpAddresses[0].Ipaddress)
+	// Get the source NAT IP assigned to the VPC
+	l, err := cs.Address.ListPublicIpAddresses(p)
+	if err != nil {
+		return err
 	}
 
+	if l.Count != 1 {
+		return fmt.Errorf("Unexpected number (%d) of source NAT IPs returned", l.Count)
+	}
+
+	d.Set("source_nat_ip", l.PublicIpAddresses[0].Ipaddress)
+
 	return nil
 }
 

website/source/docs/providers/cloudstack/r/vpc.html.markdown

@@ -49,3 +49,4 @@ The following attributes are exported:
 
 * `id` - The ID of the VPC.
 * `display_text` - The display text of the VPC.
+* `source_nat_ip` - The source NAT IP assigned to the VPC.