package command import ( "bufio" "bytes" "fmt" "sort" "strings" "sync" "unicode" "github.com/hashicorp/terraform/terraform" "github.com/mitchellh/cli" "github.com/mitchellh/colorstring" ) type UiHook struct { terraform.NilHook Colorize *colorstring.Colorize Ui cli.Ui l sync.Mutex once sync.Once resources map[string]uiResourceOp ui cli.Ui } 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) id := n.HumanId() op := uiResourceModify if d.Destroy { op = uiResourceDestroy } else if s.ID == "" { op = uiResourceCreate } h.l.Lock() h.resources[id] = op h.l.Unlock() 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 keys := make([]string, 0, len(d.Attributes)) for key, _ := range d.Attributes { // 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.Attributes[attrK] v := attrDiff.New if attrDiff.NewComputed { v = "" } attrBuf.WriteString(fmt.Sprintf( " %s:%s %#v => %#v\n", attrK, strings.Repeat(" ", keyLen-len(attrK)), attrDiff.Old, v)) } attrString := strings.TrimSpace(attrBuf.String()) if attrString != "" { attrString = "\n " + attrString } h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: %s[reset_bold]%s", id, operation, attrString))) return terraform.HookActionContinue, nil } func (h *UiHook) PostApply( n *terraform.InstanceInfo, s *terraform.InstanceState, applyerr error) (terraform.HookAction, error) { id := n.HumanId() h.l.Lock() op := h.resources[id] delete(h.resources, id) h.l.Unlock() var msg string switch 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 } h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: %s[reset_bold]", id, msg))) 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_bold]", 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() h.ui.Output(h.Colorize.Color(fmt.Sprintf( "[reset][bold]%s: Refreshing state... (ID: %s)", id, s.ID))) return terraform.HookActionContinue, nil } func (h *UiHook) init() { if h.Colorize == nil { panic("colorize not given") } h.resources = make(map[string]uiResourceOp) // 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 }