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Copy pathhook_ui.go
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322 lines (270 loc) · 7.14 KB
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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 periodicUiTimer = 10 * time.Second
type UiHook struct {
terraform.NilHook
Colorize *colorstring.Colorize
Ui cli.Ui
l sync.Mutex
once sync.Once
resources map[string]uiResourceState
ui cli.Ui
}
// uiResourceState tracks the state of a single resource
type uiResourceState struct {
Op uiResourceOp
Start time.Time
}
// 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)
id := n.HumanId()
op := uiResourceModify
if d.Destroy {
op = uiResourceDestroy
} else if s.ID == "" {
op = uiResourceCreate
}
h.l.Lock()
h.resources[id] = uiResourceState{
Op: op,
Start: time.Now().Round(time.Second),
}
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 = "<computed>"
}
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)))
// Set a timer to show an operation is still happening
time.AfterFunc(periodicUiTimer, func() { h.stillApplying(id) })
return terraform.HookActionContinue, nil
}
func (h *UiHook) stillApplying(id string) {
// Grab the operation. We defer the lock here to avoid the "still..."
// message showing up after a completion message.
h.l.Lock()
defer h.l.Unlock()
state, ok := h.resources[id]
// If the resource is out of the map it means we're done with it
if !ok {
return
}
var msg string
switch state.Op {
case uiResourceModify:
msg = "Still modifying..."
case uiResourceDestroy:
msg = "Still destroying..."
case uiResourceCreate:
msg = "Still creating..."
case uiResourceUnknown:
return
}
h.ui.Output(h.Colorize.Color(fmt.Sprintf(
"[reset][bold]%s: %s (%s elapsed)[reset_bold]",
id,
msg,
time.Now().Round(time.Second).Sub(state.Start),
)))
// Reschedule
time.AfterFunc(periodicUiTimer, func() { h.stillApplying(id) })
}
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]
delete(h.resources, id)
h.l.Unlock()
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
}
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) 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")
}
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
}