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create.go
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create.go
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package main
import (
"context"
"fmt"
"regexp"
"strings"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/filters"
"github.com/docker/docker/client"
"github.com/gdamore/tcell"
"github.com/rivo/tview"
"github.com/kelda/dksnap/pkg/snapshot"
)
type createUI struct {
client *client.Client
app *tview.Application
containerSelector *ContainerSelector
*tview.Pages
}
func newCreateUI(client *client.Client, app *tview.Application) *createUI {
ui := &createUI{
app: app,
client: client,
Pages: tview.NewPages(),
}
ui.containerSelector = NewContainerSelector(client, ui.promptCreateSnapshot, nil)
ui.Pages.AddPage("main", ui.containerSelector, true, true)
return ui
}
func (ui *createUI) run(ctx context.Context) {
if err := ui.containerSelector.Sync(ctx); err != nil {
alert(ui.app, ui.Pages, fmt.Sprintf("Failed to list containers: %s", err), nil)
}
ui.app.Draw()
for range newEventsTrigger(ctx, ui.client, "container", "start", "die") {
if err := ui.containerSelector.Sync(ctx); err != nil {
continue
}
ui.app.Draw()
}
}
func newEventsTrigger(ctx context.Context, client *client.Client, eventType string, actions ...string) chan struct{} {
trigger := make(chan struct{}, 1)
actionsSet := map[string]struct{}{}
for _, action := range actions {
actionsSet[action] = struct{}{}
}
go func() {
events, _ := client.Events(ctx, types.EventsOptions{
Filters: filters.NewArgs(filters.Arg("Type", eventType)),
})
for e := range events {
if _, ok := actionsSet[e.Action]; !ok {
continue
}
select {
case trigger <- struct{}{}:
default:
}
}
}()
return trigger
}
func (ui *createUI) promptCreateSnapshot(container Container) {
form := tview.NewForm().
Clear(true)
form.SetBorder(true).
SetTitle("Create Snapshot")
form.
AddInputField("Title", "", 20, nil, nil).
AddInputField("Image Name", "", 20, nil, nil).
AddButton("Create Snapshot", func() {
title := form.GetFormItemByLabel("Title").(*tview.InputField).GetText()
imageName := form.GetFormItemByLabel("Image Name").(*tview.InputField).GetText()
if title == "" || imageName == "" {
alert(ui.app, ui.Pages, "A title and image name are required.", form)
return
}
var dbUser string
dbUserInput := form.GetFormItemByLabel("Database User")
if dbUserInput != nil {
dbUser = dbUserInput.(*tview.InputField).GetText()
}
snapshotLogs := tview.NewTextView().
SetDynamicColors(true).
SetChangedFunc(func() {
ui.app.Draw()
})
modalContents := tview.NewFlex().
SetDirection(tview.FlexRow).
AddItem(snapshotLogs, 0, 1, false)
modalContents.
SetBorder(true).
SetTitle("Snapshot Status")
modal := newModal(modalContents, 60, 10)
ui.Pages.AddPage("snapshot-status", modal, true, true)
go func() {
ui.createSnapshot(snapshotLogs, container, title, imageName, dbUser)
ui.app.QueueUpdateDraw(func() {
exitButton := tview.NewButton("OK").SetSelectedFunc(func() {
ui.Pages.RemovePage("snapshot-status")
ui.Pages.RemovePage("create-snapshot-form")
ui.app.SetFocus(ui.containerSelector)
})
modalContents.AddItem(center(exitButton, 4, 1), 0, 1, true)
ui.app.SetFocus(exitButton)
})
}()
})
titleInput := form.GetFormItemByLabel("Title").(*tview.InputField)
imageNameInput := form.GetFormItemByLabel("Image Name").(*tview.InputField)
submitButton := form.GetButton(form.GetButtonIndex("Create Snapshot"))
inputFields := []*tview.InputField{
titleInput,
imageNameInput,
}
// We need the user to dump as when taking Postgres snapshots.
if !*forceGenericSnapshot && container.HasPostgres {
dbUser, ok := getEnv(container.Config.Env, "POSTGRES_USER")
if !ok {
dbUser = "postgres"
}
form.AddInputField("Database User", dbUser, 20, nil, nil)
inputFields = append(inputFields, form.GetFormItemByLabel("Database User").(*tview.InputField))
}
// Automatically generate image names based on the snapshot title.
titleInput.SetChangedFunc(func(name string) {
image := strings.ToLower(name)
// Convert spaces into a legal separator.
image = strings.Replace(image, " ", "-", -1)
// Remove all other illegal characters.
image = regexp.MustCompile(`[^\w.-]`).ReplaceAllString(image, "")
imageNameInput.SetText(image)
})
// Allow navigating between the fields with arrow keys.
for i, inputField := range inputFields {
i := i
isFirstField := i == 0
isLastField := i == len(inputFields)-1
inputField.SetInputCapture(
func(event *tcell.EventKey) *tcell.EventKey {
nextInput := func() {
if isLastField {
ui.app.SetFocus(submitButton)
return
}
target := (i + 1) % len(inputFields)
ui.app.SetFocus(inputFields[target])
}
prevInput := func() {
if isFirstField {
ui.app.SetFocus(submitButton)
return
}
target := (i - 1) % len(inputFields)
ui.app.SetFocus(inputFields[target])
}
switch event.Key() {
case tcell.KeyUp:
prevInput()
return nil
case tcell.KeyDown:
nextInput()
return nil
default:
return event
}
})
}
submitButton.SetInputCapture(
func(event *tcell.EventKey) *tcell.EventKey {
switch event.Key() {
case tcell.KeyUp:
ui.app.SetFocus(inputFields[len(inputFields)-1])
return nil
case tcell.KeyDown:
ui.app.SetFocus(inputFields[0])
return nil
default:
return event
}
})
// Show the form.
ui.Pages.AddPage("create-snapshot-form", newModal(form, 50, 20), true, true)
ui.app.SetFocus(form)
form.SetCancelFunc(func() {
ui.Pages.RemovePage("create-snapshot-form")
})
}
// createSnapshot takes a snapshot of the given container. It attempts to use
// the database aware snapshot implementation first, but falls back to a
// generic snapshot if that fails.
func (ui *createUI) createSnapshot(out *tview.TextView, container Container, title, imageName, dbUser string) {
fmt.Fprintf(out, "Creating snapshot..")
pp := NewProgressPrinter(out)
pp.Start()
// Take the database aware snapshot.
var snapshotter snapshot.Snapshotter
switch {
case !*forceGenericSnapshot && container.HasPostgres:
snapshotter = snapshot.NewPostgres(ui.client, dbUser)
case !*forceGenericSnapshot && container.HasMongo:
snapshotter = snapshot.NewMongo(ui.client)
case !*forceGenericSnapshot && container.HasMySQL:
snapshotter = snapshot.NewMySQL(ui.client)
default:
snapshotter = snapshot.NewGeneric(ui.client)
}
err := snapshotter.Create(context.Background(), container.ContainerJSON, title, imageName)
pp.Stop()
out.Clear()
out.SetTextAlign(tview.AlignCenter)
if err == nil {
fmt.Fprintln(out, "[green]Successfully created snapshot![-]")
return
}
fmt.Fprintf(out, "[red]Failed to create snapshot[-]\n%s", err)
// Don't try snapshotting again if we already tried the generic snapshot.
if _, ok := snapshotter.(*snapshot.Generic); ok {
return
}
fmt.Fprintln(out)
fmt.Fprintf(out, "[yellow]Falling back to using a generic snapshot..")
pp.Start()
err = snapshot.NewGeneric(ui.client).Create(context.Background(), container.ContainerJSON, title, imageName)
pp.Stop()
if err == nil {
fmt.Fprintln(out, "[green]Successfully created snapshot![-]")
} else {
fmt.Fprintf(out, "[red]Failed to create snapshot[-]\n%s", err)
}
}
// Returns a new primitive which puts the provided primitive in the center and
// sets its size to the given width and height.
func newModal(p tview.Primitive, width, height int) tview.Primitive {
return tview.NewFlex().
AddItem(nil, 0, 1, false).
AddItem(tview.NewFlex().SetDirection(tview.FlexRow).
AddItem(nil, 0, 1, false).
AddItem(p, height, 1, false).
AddItem(nil, 0, 1, false), width, 1, false).
AddItem(nil, 0, 1, false)
}
// Returns a new primitive which centers the provided primitive and
// sets its size to the given width and height.
func center(p tview.Primitive, width, height int) tview.Primitive {
return tview.NewFlex().
AddItem(tview.NewBox(), 0, 1, false).
AddItem(tview.NewFlex().SetDirection(tview.FlexRow).
AddItem(tview.NewBox(), 0, 1, false).
AddItem(p, height, 1, false).
AddItem(tview.NewBox(), 0, 1, false), width, 1, false).
AddItem(tview.NewBox(), 0, 1, false)
}
func getEnv(vars []string, key string) (string, bool) {
for _, env := range vars {
envParts := strings.Split(env, "=")
if len(envParts) != 2 {
continue
}
if envParts[0] == key {
return envParts[1], true
}
}
return "", false
}