Add LB certificates list support

openstack/networking/v2/extensions/lbaas_v2/certificates/requests.go

@@ -2,8 +2,47 @@ package certificates
 
 import (
 	"github.com/huaweicloud/golangsdk"
+	"github.com/huaweicloud/golangsdk/pagination"
 )
 
+// ListOptsBuilder allows extensions to add additional parameters to the
+// List request.
+type ListOptsBuilder interface {
+	ToCertificateListQuery() (string, error)
+}
+
+type ListOpts struct {
+	ID          string `q:"id"`
+	Name        string `q:"name"`
+	Description string `q:"description"`
+	Type        string `q:"type"`
+	Domain      string `q:"domain"`
+	PrivateKey  string `q:"private_key"`
+	Certificate string `q:"certificate"`
+	Limit       int    `q:"limit"`
+	Marker      string `q:"marker"`
+}
+
+// ToCertificateListQuery formats a ListOpts into a query string.
+func (opts ListOpts) ToCertificateListQuery() (string, error) {
+	q, err := golangsdk.BuildQueryString(opts)
+	return q.String(), err
+}
+
+func List(c *golangsdk.ServiceClient, opts ListOptsBuilder) pagination.Pager {
+	url := rootURL(c)
+	if opts != nil {
+		query, err := opts.ToCertificateListQuery()
+		if err != nil {
+			return pagination.Pager{Err: err}
+		}
+		url += query
+	}
+	return pagination.NewPager(c, url, func(r pagination.PageResult) pagination.Page {
+		return CertificatePage{pagination.SinglePageBase(r)}
+	})
+}
+
 // CreateOptsBuilder is the interface options structs have to satisfy in order
 // to be used in the main Create operation in this package. Since many
 // extensions decorate or modify the common logic, it is useful for them to

openstack/networking/v2/extensions/lbaas_v2/certificates/results.go

@@ -2,6 +2,7 @@ package certificates
 
 import (
 	"github.com/huaweicloud/golangsdk"
+	"github.com/huaweicloud/golangsdk/pagination"
 )
 
 type Certificate struct {
@@ -16,6 +17,23 @@ type Certificate struct {
 	UpdateTime  string `json:"update_time"`
 }
 
+// CertificatePage is the page returned by a pager when traversing over a
+// collection of certificates.
+type CertificatePage struct {
+	pagination.SinglePageBase
+}
+
+// ExtractCertificates accepts a Page struct, specifically a CertificatePage struct,
+// and extracts the elements into a slice of Certificate structs. In other words,
+// a generic collection is mapped into a relevant slice.
+func ExtractCertificates(r pagination.Page) ([]Certificate, error) {
+	var s struct {
+		Certificates []Certificate `json:"certificates"`
+	}
+	err := (r.(CertificatePage)).ExtractInto(&s)
+	return s.Certificates, err
+}
+
 type commonResult struct {
 	golangsdk.Result
 }