DockerCLI/cli/command/container/tty.go

98 lines
2.4 KiB
Go

package container
import (
"context"
"fmt"
"os"
gosignal "os/signal"
"runtime"
"time"
"github.com/docker/cli/cli/command"
"github.com/docker/docker/api/types"
"github.com/docker/docker/client"
"github.com/docker/docker/pkg/signal"
"github.com/sirupsen/logrus"
)
// resizeTtyTo resizes tty to specific height and width
func resizeTtyTo(ctx context.Context, client client.ContainerAPIClient, id string, height, width uint, isExec bool) error {
if height == 0 && width == 0 {
return nil
}
options := types.ResizeOptions{
Height: height,
Width: width,
}
var err error
if isExec {
err = client.ContainerExecResize(ctx, id, options)
} else {
err = client.ContainerResize(ctx, id, options)
}
if err != nil {
logrus.Debugf("Error resize: %s\r", err)
}
return err
}
// resizeTty is to resize the tty with cli out's tty size
func resizeTty(ctx context.Context, cli command.Cli, id string, isExec bool) error {
height, width := cli.Out().GetTtySize()
return resizeTtyTo(ctx, cli.Client(), id, height, width, isExec)
}
// initTtySize is to init the tty's size to the same as the window, if there is an error, it will retry 5 times.
func initTtySize(ctx context.Context, cli command.Cli, id string, isExec bool, resizeTtyFunc func(ctx context.Context, cli command.Cli, id string, isExec bool) error) {
rttyFunc := resizeTtyFunc
if rttyFunc == nil {
rttyFunc = resizeTty
}
if err := rttyFunc(ctx, cli, id, isExec); err != nil {
go func() {
var err error
for retry := 0; retry < 5; retry++ {
time.Sleep(10 * time.Millisecond)
if err = rttyFunc(ctx, cli, id, isExec); err == nil {
break
}
}
if err != nil {
fmt.Fprintln(cli.Err(), "failed to resize tty, using default size")
}
}()
}
}
// MonitorTtySize updates the container tty size when the terminal tty changes size
func MonitorTtySize(ctx context.Context, cli command.Cli, id string, isExec bool) error {
initTtySize(ctx, cli, id, isExec, resizeTty)
if runtime.GOOS == "windows" {
go func() {
prevH, prevW := cli.Out().GetTtySize()
for {
time.Sleep(time.Millisecond * 250)
h, w := cli.Out().GetTtySize()
if prevW != w || prevH != h {
resizeTty(ctx, cli, id, isExec)
}
prevH = h
prevW = w
}
}()
} else {
sigchan := make(chan os.Signal, 1)
gosignal.Notify(sigchan, signal.SIGWINCH)
go func() {
for range sigchan {
resizeTty(ctx, cli, id, isExec)
}
}()
}
return nil
}