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package extensions
import (
"github.com/mitchellh/mapstructure"
"github.com/rackspace/gophercloud"
"github.com/rackspace/gophercloud/pagination"
)
// GetResult temporarily stores the result of a Get call.
// Use its Extract() method to interpret it as an Extension.
type GetResult struct {
gophercloud.Result
}
// Extract interprets a GetResult as an Extension.
func (r GetResult) Extract() (*Extension, error) {
if r.Err != nil {
return nil, r.Err
}
var res struct {
Extension *Extension `json:"extension"`
}
err := mapstructure.Decode(r.Body, &res)
return res.Extension, err
}
// Extension is a struct that represents an OpenStack extension.
type Extension struct {
Updated string `json:"updated" mapstructure:"updated"`
Name string `json:"name" mapstructure:"name"`
Links []interface{} `json:"links" mapstructure:"links"`
Namespace string `json:"namespace" mapstructure:"namespace"`
Alias string `json:"alias" mapstructure:"alias"`
Description string `json:"description" mapstructure:"description"`
}
// ExtensionPage is the page returned by a pager when traversing over a collection of extensions.
type ExtensionPage struct {
pagination.SinglePageBase
}
// IsEmpty checks whether an ExtensionPage struct is empty.
func (r ExtensionPage) IsEmpty() (bool, error) {
is, err := ExtractExtensions(r)
if err != nil {
return true, err
}
return len(is) == 0, nil
}
// ExtractExtensions accepts a Page struct, specifically an ExtensionPage struct, and extracts the
// elements into a slice of Extension structs.
// In other words, a generic collection is mapped into a relevant slice.
func ExtractExtensions(page pagination.Page) ([]Extension, error) {
var resp struct {
Extensions []Extension `mapstructure:"extensions"`
}
err := mapstructure.Decode(page.(ExtensionPage).Body, &resp)
return resp.Extensions, err
}
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