Example extensible gophercloud for microversions

main.go

package main

import (
	"fmt"

	"github.com/gophercloud/gophercloud"
	"github.com/gophercloud/gophercloud/openstack"
	"github.com/gophercloud/gophercloud/openstack/blockstorage/v3/volumes"
)

type myCreateOpts struct {
	volumes.CreateOpts
	GroupID string `json:"group_id,omitempty"`
}

func main() {
	// Boilerplate to set up a provider
	opts := gophercloud.AuthOptions{
		IdentityEndpoint: "http://10.117.36.5:5000/v3",
		Username:         "jdg",
		Password:         "r7gh8ae",
		TenantID:         "394337ba489a40678dc6ebf4d4c4af78",
		DomainName:       "default",
	}
	provider, err := openstack.AuthenticatedClient(opts)
	if err != nil {
		fmt.Printf("Error is: %+v", err)
	}
	eopts := gophercloud.EndpointOpts{
		Region: "RegionOne",
	}

	// Ok, now that that's done, try something interesting...
	createMV := "3.13"
	cOpts := myCreateOpts{}
	cOpts.Size = 1
	client, _ := openstack.NewBlockStorageV3(provider, eopts)
	client.Microversion = createMV

	r := gophercloud.Result{}
	b, err := gophercloud.BuildRequestBody(cOpts, "volume")
	if err != nil {
		fmt.Printf("Error building request: %v", err)
		fmt.Printf("DOH!!")
	}
	_, r.Err = client.Post(client.ServiceURL("volumes"), b, &r.Body, &gophercloud.RequestOpts{OkCodes: []int{202}})
	if r.Err != nil {
		fmt.Printf("Ouch! So close!: %v", r.Err)
	}
}