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