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paraprogress.go
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paraprogress.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package paraprogress
import (
"context"
"fmt"
"os"
"time"
"github.com/LastPossum/kamino"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
"github.com/muesli/termenv"
"golang.org/x/term"
"kraftkit.sh/iostreams"
"kraftkit.sh/log"
"kraftkit.sh/tui"
)
var tprog *tea.Program
type ParaProgress struct {
processes []*Process
quitting bool
width int
timerWidth int
parallel bool
ctx context.Context
norender bool
maxConcurrent int
curr int
err error
errChan chan error
failFast bool
nameWidth int
timeout time.Duration
oldOut iostreams.FileWriter
}
func NewParaProgress(ctx context.Context, processes []*Process, opts ...ParaProgressOption) (*ParaProgress, error) {
if len(processes) == 0 {
return nil, fmt.Errorf("no processes to perform")
}
md := &ParaProgress{
processes: processes,
errChan: make(chan error),
curr: 0,
ctx: ctx,
// -1 represents the default mode where ecah individual
// process's name's width is checked and the maximum of all
// is used.
nameWidth: -1,
oldOut: iostreams.G(ctx).Out,
}
for _, opt := range opts {
if err := opt(md); err != nil {
return nil, err
}
}
maxNameLen := md.nameWidth
if maxNameLen <= 0 {
for _, process := range processes {
if nameLen := len(process.Name); nameLen > maxNameLen {
maxNameLen = nameLen
}
}
}
for _, process := range processes {
process.norender = md.norender
process.NameWidth = maxNameLen
process.timeout = md.timeout
if md.norender {
process.ctx = ctx
} else {
pctx := ctx
logger, err := kamino.Clone(log.G(pctx),
kamino.WithZeroUnexported(),
)
if err != nil {
return nil, err
}
// Update formatter when using KraftKit's TextFormatter. The
// TextFormatter recognises that this is a non-standard terminal and
// changes the output to a more machine readable format. Instead we want
// to force the formatting so that the output looks seamless with the
// style of the TUI.
if formatter, ok := logger.Formatter.(*log.TextFormatter); ok {
formatter.ForceColors = termenv.DefaultOutput().ColorProfile() != termenv.Ascii
formatter.ForceFormatting = true
logger.Formatter = formatter
}
logger.Out = process
pctx = log.WithLogger(pctx, logger)
ios, err := kamino.Clone(iostreams.G(pctx),
kamino.WithZeroUnexported(),
)
if err != nil {
return nil, err
}
ios.Out = iostreams.NewNoTTYWriter(process, iostreams.G(ctx).Out.Fd())
ios.ErrOut = process
ios.In = iostreams.G(ctx).In
pctx = iostreams.WithIOStreams(pctx, ios)
process.ctx = pctx
}
}
return md, nil
}
func (pd *ParaProgress) Start() error {
teaOpts := []tea.ProgramOption{
tea.WithInput(nil),
tea.WithContext(pd.ctx),
}
if pd.norender {
teaOpts = append(teaOpts, tea.WithoutRenderer())
} else {
// Set this super early (even before bubbletea), as fast exiting processes
// may not have received the window size update and therefore pd.width is
// set to zero.
pd.width, pd.maxConcurrent, _ = term.GetSize(int(os.Stdout.Fd()))
}
tprog = tea.NewProgram(pd, teaOpts...)
// Restore the old output for the IOStreams which is manipulated per process.
defer func() {
iostreams.G(pd.ctx).Out = pd.oldOut
log.G(pd.ctx).Out = pd.oldOut
}()
if _, err := tprog.Run(); err != nil {
return err
}
return pd.err
}
func (md ParaProgress) Init() tea.Cmd {
var cmds []tea.Cmd
for _, process := range md.processes {
cmds = append(cmds, process.Init())
if md.parallel {
cmds = append(cmds, process.Start())
}
}
// Start the first download if not in parallel mode
if !md.parallel {
cmds = append(cmds, md.processes[0].Start())
}
return tea.Batch(cmds...)
}
func (md *ParaProgress) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
var cmds []tea.Cmd
switch msg := msg.(type) {
// tea.KeyMsg is sent whenever there is a keyboard interrupt
case tea.KeyMsg:
switch msg.String() {
case "ctrl+c":
md.quitting = true
md.err = fmt.Errorf("force quit")
return md, tea.Quit
}
case StatusMsg:
if msg.err != nil {
md.err = msg.err
}
if msg.err != nil && md.failFast {
md.quitting = true
cmds = append(cmds, tea.Quit)
} else if (!md.failFast || msg.status == StatusSuccess) && !md.parallel {
md.curr++
if len(md.processes) > md.curr {
cmds = append(cmds, md.processes[md.curr].Start())
}
}
}
var cmd tea.Cmd
complete := 0
for i := range md.processes {
md.processes[i], cmd = md.processes[i].Update(msg)
cmds = append(cmds, cmd)
if md.processes[i].timerWidth > md.timerWidth {
md.timerWidth = md.processes[i].timerWidth
}
if md.processes[i].Status == StatusFailed ||
md.processes[i].Status == StatusSuccess ||
md.processes[i].percent == 1 {
complete++
}
}
// Update each process to have the same width
for i := range md.processes {
md.processes[i].timerMax = md.timerWidth
}
if complete == len(md.processes) {
md.quitting = true
batch := tea.Batch(cmds...)
if batch == nil {
return md, tea.Quit
}
return md, tea.Sequence(batch, tea.Quit)
}
return md, tea.Batch(cmds...)
}
func (md ParaProgress) View() string {
if md.norender {
return ""
}
var content []string
for _, process := range md.processes {
content = append(content, process.View())
}
if md.quitting {
content = append(content, "")
} else {
content = append(content, tui.TextLightGray("ctrl+c to cancel"))
}
return lipgloss.JoinVertical(lipgloss.Left, content...)
}