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package dockerutil
import (
"context"
"io"
"sync"
"github.com/docker/buildx/util/progress"
"github.com/docker/cli/cli/command"
"github.com/docker/docker/client"
)
// Client represents an active docker object.
type Client struct {
cli command.Cli
featuresOnce sync.Once
featuresCache map[Feature]bool
}
// NewClient initializes a new docker client.
func NewClient(cli command.Cli) *Client {
return &Client{cli: cli}
}
// API returns a new docker API client.
func (c *Client) API(name string) (client.APIClient, error) {
if name == "" {
name = c.cli.CurrentContext()
}
return NewClientAPI(c.cli, name)
}
// LoadImage imports an image to docker.
func (c *Client) LoadImage(ctx context.Context, name string, status progress.Writer) (io.WriteCloser, func(), error) {
dapi, err := c.API(name)
if err != nil {
return nil, nil, err
}
pr, pw := io.Pipe()
done := make(chan struct{})
var w *waitingWriter
w = &waitingWriter{
PipeWriter: pw,
f: func() {
handleErr := func(err error) {
pr.CloseWithError(err)
w.mu.Lock()
w.err = err
w.mu.Unlock()
}
resp, err := dapi.ImageLoad(ctx, pr, false)
defer close(done)
if err != nil {
handleErr(err)
return
}
status = progress.ResetTime(status)
if err := progress.Wrap("importing to docker", status.Write, func(l progress.SubLogger) error {
return fromReader(l, resp.Body)
}); err != nil {
handleErr(err)
}
},
done: done,
}
return w, func() {
pr.Close()
}, nil
}
func (c *Client) Features(ctx context.Context, name string) map[Feature]bool {
c.featuresOnce.Do(func() {
c.featuresCache = c.features(ctx, name)
})
return c.featuresCache
}
func (c *Client) features(ctx context.Context, name string) map[Feature]bool {
features := make(map[Feature]bool)
if dapi, err := c.API(name); err == nil {
if info, err := dapi.Info(ctx); err == nil {
for _, v := range info.DriverStatus {
switch v[0] {
case "driver-type":
if v[1] == "io.containerd.snapshotter.v1" {
features[OCIImporter] = true
}
}
}
}
}
return features
}
type waitingWriter struct {
*io.PipeWriter
f func()
once sync.Once
mu sync.Mutex
err error
done chan struct{}
}
func (w *waitingWriter) Write(dt []byte) (int, error) {
w.once.Do(func() {
go w.f()
})
return w.PipeWriter.Write(dt)
}
func (w *waitingWriter) Close() error {
err := w.PipeWriter.Close()
<-w.done
if err == nil {
w.mu.Lock()
defer w.mu.Unlock()
return w.err
}
return err
}
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