87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
package openstack
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"github.com/mitchellh/multistep"
|
|
"github.com/rackspace/gophercloud"
|
|
"log"
|
|
"time"
|
|
)
|
|
|
|
// StateRefreshFunc is a function type used for StateChangeConf that is
|
|
// responsible for refreshing the item being watched for a state change.
|
|
//
|
|
// It returns three results. `result` is any object that will be returned
|
|
// as the final object after waiting for state change. This allows you to
|
|
// return the final updated object, for example an openstack instance after
|
|
// refreshing it.
|
|
//
|
|
// `state` is the latest state of that object. And `err` is any error that
|
|
// may have happened while refreshing the state.
|
|
type StateRefreshFunc func() (result interface{}, state string, progress int, err error)
|
|
|
|
// StateChangeConf is the configuration struct used for `WaitForState`.
|
|
type StateChangeConf struct {
|
|
Pending []string
|
|
Refresh StateRefreshFunc
|
|
StepState multistep.StateBag
|
|
Target string
|
|
}
|
|
|
|
// ServerStateRefreshFunc returns a StateRefreshFunc that is used to watch
|
|
// an openstacn server.
|
|
func ServerStateRefreshFunc(csp gophercloud.CloudServersProvider, s *gophercloud.Server) StateRefreshFunc {
|
|
return func() (interface{}, string, int, error) {
|
|
resp, err := csp.ServerById(s.Id)
|
|
if err != nil {
|
|
log.Printf("Error on ServerStateRefresh: %s", err)
|
|
return nil, "", 0, err
|
|
}
|
|
|
|
return resp, resp.Status, resp.Progress, nil
|
|
}
|
|
}
|
|
|
|
// WaitForState watches an object and waits for it to achieve a certain
|
|
// state.
|
|
func WaitForState(conf *StateChangeConf) (i interface{}, err error) {
|
|
log.Printf("Waiting for state to become: %s", conf.Target)
|
|
|
|
for {
|
|
var currentProgress int
|
|
var currentState string
|
|
i, currentState, currentProgress, err = conf.Refresh()
|
|
if err != nil {
|
|
return
|
|
}
|
|
|
|
if currentState == conf.Target {
|
|
return
|
|
}
|
|
|
|
if conf.StepState != nil {
|
|
if _, ok := conf.StepState.GetOk(multistep.StateCancelled); ok {
|
|
return nil, errors.New("interrupted")
|
|
}
|
|
}
|
|
|
|
found := false
|
|
for _, allowed := range conf.Pending {
|
|
if currentState == allowed {
|
|
found = true
|
|
break
|
|
}
|
|
}
|
|
|
|
if !found {
|
|
return nil, fmt.Errorf("unexpected state '%s', wanted target '%s'", currentState, conf.Target)
|
|
}
|
|
|
|
log.Printf("Waiting for state to become: %s currently %s (%d%%)", conf.Target, currentState, currentProgress)
|
|
time.Sleep(2 * time.Second)
|
|
}
|
|
|
|
return
|
|
}
|