package command import ( "bufio" "bytes" "fmt" "sort" "strings" "sync" "time" "unicode" "github.com/hashicorp/terraform/terraform" "github.com/mitchellh/cli" "github.com/mitchellh/colorstring" ) const defaultPeriodicUiTimer = 10 * time.Second const maxIdLen = 80 type UiHook struct { terraform.NilHook Colorize *colorstring.Colorize Ui cli.Ui PeriodicUiTimer time.Duration l sync.Mutex once sync.Once resources map[string]uiResourceState ui cli.Ui } // uiResourceState tracks the state of a single resource type uiResourceState struct { Name string ResourceId string Op uiResourceOp Start time.Time DoneCh chan struct{} // To be used for cancellation done chan struct{} // used to coordinate tests } // uiResourceOp is an enum for operations on a resource type uiResourceOp byte const ( uiResourceUnknown uiResourceOp = iota uiResourceCreate uiResourceModify uiResourceDestroy ) func (h *UiHook) PreApply( n *terraform.InstanceInfo, s *terraform.InstanceState, d *terraform.InstanceDiff) (terraform.HookAction, error) { h.once.Do(h.init) // if there's no diff, there's nothing to output if d.Empty() { return terraform.HookActionContinue, nil } id := n.HumanId() op := uiResourceModify if d.Destroy { op = uiResourceDestroy } else if s.ID == "" { op = uiResourceCreate } var operation string switch op { case uiResourceModify: operation = "Modifying..." case uiResourceDestroy: operation = "Destroying..." case uiResourceCreate: operation = "Creating..." case uiResourceUnknown: return terraform.HookActionContinue, nil } attrBuf := new(bytes.Buffer) // Get all the attributes that are changing, and sort them. Also // determine the longest key so that we can align them all. keyLen := 0 dAttrs := d.CopyAttributes() keys := make([]string, 0, len(dAttrs)) for key, _ := range dAttrs { // Skip the ID since we do that specially if key == "id" { continue } keys = append(keys, key) if len(key) > keyLen { keyLen = len(key) } } sort.Strings(keys) // Go through and output each attribute for _, attrK := range keys { attrDiff, _ := d.GetAttribute(attrK) v := attrDiff.New u := attrDiff.Old if attrDiff.NewComputed { v = "" } if attrDiff.Sensitive { u = "" v = "" } attrBuf.WriteString(fmt.Sprintf( " %s:%s %#v => %#v\n", attrK, strings.Repeat(" ", keyLen-len(attrK)), u, v)) } attrString := strings.TrimSpace(attrBuf.String()) if attrString != "" { attrString = "\n " + attrString } var stateId, stateIdSuffix string if s != nil && s.ID != "" { stateId = s.ID stateIdSuffix = fmt.Sprintf(" (ID: %s)", truncateId(s.ID, maxIdLen)) } h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: %s%s[reset]%s", id, operation, stateIdSuffix, attrString))) uiState := uiResourceState{ Name: id, ResourceId: stateId, Op: op, Start: time.Now().Round(time.Second), DoneCh: make(chan struct{}), done: make(chan struct{}), } h.l.Lock() h.resources[id] = uiState h.l.Unlock() // Start goroutine that shows progress go h.stillApplying(uiState) return terraform.HookActionContinue, nil } func (h *UiHook) stillApplying(state uiResourceState) { defer close(state.done) for { select { case <-state.DoneCh: return case <-time.After(h.PeriodicUiTimer): // Timer up, show status } var msg string switch state.Op { case uiResourceModify: msg = "Still modifying..." case uiResourceDestroy: msg = "Still destroying..." case uiResourceCreate: msg = "Still creating..." case uiResourceUnknown: return } idSuffix := "" if v := state.ResourceId; v != "" { idSuffix = fmt.Sprintf("ID: %s, ", truncateId(v, maxIdLen)) } h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: %s (%s%s elapsed)[reset]", state.Name, msg, idSuffix, time.Now().Round(time.Second).Sub(state.Start), ))) } } func (h *UiHook) PostApply( n *terraform.InstanceInfo, s *terraform.InstanceState, applyerr error) (terraform.HookAction, error) { id := n.HumanId() h.l.Lock() state := h.resources[id] if state.DoneCh != nil { close(state.DoneCh) } delete(h.resources, id) h.l.Unlock() var stateIdSuffix string if s != nil && s.ID != "" { stateIdSuffix = fmt.Sprintf(" (ID: %s)", truncateId(s.ID, maxIdLen)) } var msg string switch state.Op { case uiResourceModify: msg = "Modifications complete" case uiResourceDestroy: msg = "Destruction complete" case uiResourceCreate: msg = "Creation complete" case uiResourceUnknown: return terraform.HookActionContinue, nil } if applyerr != nil { // Errors are collected and printed in ApplyCommand, no need to duplicate return terraform.HookActionContinue, nil } colorized := h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: %s%s[reset]", id, msg, stateIdSuffix)) h.ui.Output(colorized) return terraform.HookActionContinue, nil } func (h *UiHook) PreDiff( n *terraform.InstanceInfo, s *terraform.InstanceState) (terraform.HookAction, error) { return terraform.HookActionContinue, nil } func (h *UiHook) PreProvision( n *terraform.InstanceInfo, provId string) (terraform.HookAction, error) { id := n.HumanId() h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: Provisioning with '%s'...[reset]", id, provId))) return terraform.HookActionContinue, nil } func (h *UiHook) ProvisionOutput( n *terraform.InstanceInfo, provId string, msg string) { id := n.HumanId() var buf bytes.Buffer buf.WriteString(h.Colorize.Color("[reset]")) prefix := fmt.Sprintf("%s (%s): ", id, provId) s := bufio.NewScanner(strings.NewReader(msg)) s.Split(scanLines) for s.Scan() { line := strings.TrimRightFunc(s.Text(), unicode.IsSpace) if line != "" { buf.WriteString(fmt.Sprintf("%s%s\n", prefix, line)) } } h.ui.Output(strings.TrimSpace(buf.String())) } func (h *UiHook) PreRefresh( n *terraform.InstanceInfo, s *terraform.InstanceState) (terraform.HookAction, error) { h.once.Do(h.init) id := n.HumanId() var stateIdSuffix string // Data resources refresh before they have ids, whereas managed // resources are only refreshed when they have ids. if s.ID != "" { stateIdSuffix = fmt.Sprintf(" (ID: %s)", truncateId(s.ID, maxIdLen)) } h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: Refreshing state...%s", id, stateIdSuffix))) return terraform.HookActionContinue, nil } func (h *UiHook) PreImportState( n *terraform.InstanceInfo, id string) (terraform.HookAction, error) { h.once.Do(h.init) h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: Importing from ID %q...", n.HumanId(), id))) return terraform.HookActionContinue, nil } func (h *UiHook) PostImportState( n *terraform.InstanceInfo, s []*terraform.InstanceState) (terraform.HookAction, error) { h.once.Do(h.init) id := n.HumanId() h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold][green]%s: Import complete!", id))) for _, s := range s { h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][green] Imported %s (ID: %s)", s.Ephemeral.Type, s.ID))) } return terraform.HookActionContinue, nil } func (h *UiHook) init() { if h.Colorize == nil { panic("colorize not given") } if h.PeriodicUiTimer == 0 { h.PeriodicUiTimer = defaultPeriodicUiTimer } h.resources = make(map[string]uiResourceState) // Wrap the ui so that it is safe for concurrency regardless of the // underlying reader/writer that is in place. h.ui = &cli.ConcurrentUi{Ui: h.Ui} } // scanLines is basically copied from the Go standard library except // we've modified it to also fine `\r`. func scanLines(data []byte, atEOF bool) (advance int, token []byte, err error) { if atEOF && len(data) == 0 { return 0, nil, nil } if i := bytes.IndexByte(data, '\n'); i >= 0 { // We have a full newline-terminated line. return i + 1, dropCR(data[0:i]), nil } if i := bytes.IndexByte(data, '\r'); i >= 0 { // We have a full newline-terminated line. return i + 1, dropCR(data[0:i]), nil } // If we're at EOF, we have a final, non-terminated line. Return it. if atEOF { return len(data), dropCR(data), nil } // Request more data. return 0, nil, nil } // dropCR drops a terminal \r from the data. func dropCR(data []byte) []byte { if len(data) > 0 && data[len(data)-1] == '\r' { return data[0 : len(data)-1] } return data } func truncateId(id string, maxLen int) string { totalLength := len(id) if totalLength <= maxLen { return id } if maxLen < 5 { // We don't shorten to less than 5 chars // as that would be pointless with ... (3 chars) maxLen = 5 } dots := "..." partLen := maxLen / 2 leftIdx := partLen - 1 leftPart := id[0:leftIdx] rightIdx := totalLength - partLen - 1 overlap := maxLen - (partLen*2 + len(dots)) if overlap < 0 { rightIdx -= overlap } rightPart := id[rightIdx:] return leftPart + dots + rightPart }