96 lines
2.6 KiB
Go
96 lines
2.6 KiB
Go
package openstack
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import (
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"errors"
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"fmt"
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"log"
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"time"
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"github.com/mitchellh/multistep"
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"github.com/rackspace/gophercloud"
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"github.com/rackspace/gophercloud/openstack/compute/v2/servers"
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)
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// StateRefreshFunc is a function type used for StateChangeConf that is
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// responsible for refreshing the item being watched for a state change.
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//
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// It returns three results. `result` is any object that will be returned
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// as the final object after waiting for state change. This allows you to
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// return the final updated object, for example an openstack instance after
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// refreshing it.
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//
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// `state` is the latest state of that object. And `err` is any error that
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// may have happened while refreshing the state.
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type StateRefreshFunc func() (result interface{}, state string, progress int, err error)
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// StateChangeConf is the configuration struct used for `WaitForState`.
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type StateChangeConf struct {
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Pending []string
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Refresh StateRefreshFunc
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StepState multistep.StateBag
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Target string
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}
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// ServerStateRefreshFunc returns a StateRefreshFunc that is used to watch
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// an openstack server.
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func ServerStateRefreshFunc(
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client *gophercloud.ServiceClient, s *servers.Server) StateRefreshFunc {
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return func() (interface{}, string, int, error) {
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serverNew, err := servers.Get(client, s.ID).Extract()
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if err != nil {
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errCode, ok := err.(*gophercloud.UnexpectedResponseCodeError)
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if ok && errCode.Actual == 404 {
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log.Printf("[INFO] 404 on ServerStateRefresh, returning DELETED")
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return nil, "DELETED", 0, nil
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} else {
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log.Printf("[ERROR] Error on ServerStateRefresh: %s", err)
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return nil, "", 0, err
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}
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}
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return serverNew, serverNew.Status, serverNew.Progress, nil
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}
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}
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// WaitForState watches an object and waits for it to achieve a certain
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// state.
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func WaitForState(conf *StateChangeConf) (i interface{}, err error) {
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log.Printf("Waiting for state to become: %s", conf.Target)
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for {
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var currentProgress int
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var currentState string
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i, currentState, currentProgress, err = conf.Refresh()
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if err != nil {
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return
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}
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if currentState == conf.Target {
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return
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}
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if conf.StepState != nil {
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if _, ok := conf.StepState.GetOk(multistep.StateCancelled); ok {
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return nil, errors.New("interrupted")
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}
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}
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found := false
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for _, allowed := range conf.Pending {
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if currentState == allowed {
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found = true
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break
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}
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}
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if !found {
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return nil, fmt.Errorf("unexpected state '%s', wanted target '%s'", currentState, conf.Target)
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}
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log.Printf("Waiting for state to become: %s currently %s (%d%%)", conf.Target, currentState, currentProgress)
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time.Sleep(2 * time.Second)
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}
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return
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}
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