packer-cn/builder/openstack/server.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
}