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|
package flavors
import (
"errors"
"reflect"
"github.com/mitchellh/mapstructure"
"github.com/rackspace/gophercloud"
"github.com/rackspace/gophercloud/pagination"
)
// ErrCannotInterpret is returned by an Extract call if the response body doesn't have the expected structure.
var ErrCannotInterpet = errors.New("Unable to interpret a response body.")
// GetResult temporarily holds the response from a Get call.
type GetResult struct {
gophercloud.Result
}
// Extract provides access to the individual Flavor returned by the Get function.
func (gr GetResult) Extract() (*Flavor, error) {
if gr.Err != nil {
return nil, gr.Err
}
var result struct {
Flavor Flavor `mapstructure:"flavor"`
}
cfg := &mapstructure.DecoderConfig{
DecodeHook: defaulter,
Result: &result,
}
decoder, err := mapstructure.NewDecoder(cfg)
if err != nil {
return nil, err
}
err = decoder.Decode(gr.Body)
return &result.Flavor, err
}
// Flavor records represent (virtual) hardware configurations for server resources in a region.
type Flavor struct {
// The Id field contains the flavor's unique identifier.
// For example, this identifier will be useful when specifying which hardware configuration to use for a new server instance.
ID string `mapstructure:"id"`
// The Disk and RA< fields provide a measure of storage space offered by the flavor, in GB and MB, respectively.
Disk int `mapstructure:"disk"`
RAM int `mapstructure:"ram"`
// The Name field provides a human-readable moniker for the flavor.
Name string `mapstructure:"name"`
RxTxFactor float64 `mapstructure:"rxtx_factor"`
// Swap indicates how much space is reserved for swap.
// If not provided, this field will be set to 0.
Swap int `mapstructure:"swap"`
// VCPUs indicates how many (virtual) CPUs are available for this flavor.
VCPUs int `mapstructure:"vcpus"`
}
// FlavorPage contains a single page of the response from a List call.
type FlavorPage struct {
pagination.LinkedPageBase
}
// IsEmpty determines if a page contains any results.
func (p FlavorPage) IsEmpty() (bool, error) {
flavors, err := ExtractFlavors(p)
if err != nil {
return true, err
}
return len(flavors) == 0, nil
}
// NextPageURL uses the response's embedded link reference to navigate to the next page of results.
func (p FlavorPage) NextPageURL() (string, error) {
type resp struct {
Links []gophercloud.Link `mapstructure:"flavors_links"`
}
var r resp
err := mapstructure.Decode(p.Body, &r)
if err != nil {
return "", err
}
return gophercloud.ExtractNextURL(r.Links)
}
func defaulter(from, to reflect.Kind, v interface{}) (interface{}, error) {
if (from == reflect.String) && (to == reflect.Int) {
return 0, nil
}
return v, nil
}
// ExtractFlavors provides access to the list of flavors in a page acquired from the List operation.
func ExtractFlavors(page pagination.Page) ([]Flavor, error) {
casted := page.(FlavorPage).Body
var container struct {
Flavors []Flavor `mapstructure:"flavors"`
}
cfg := &mapstructure.DecoderConfig{
DecodeHook: defaulter,
Result: &container,
}
decoder, err := mapstructure.NewDecoder(cfg)
if err != nil {
return container.Flavors, err
}
err = decoder.Decode(casted)
if err != nil {
return container.Flavors, err
}
return container.Flavors, nil
}
|
