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driver.go
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driver.go
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package kubernetes
import (
"context"
"fmt"
"net"
"strings"
"time"
"github.com/docker/buildx/driver"
"github.com/docker/buildx/driver/kubernetes/execconn"
"github.com/docker/buildx/driver/kubernetes/manifest"
"github.com/docker/buildx/driver/kubernetes/podchooser"
"github.com/docker/buildx/store"
"github.com/docker/buildx/util/platformutil"
"github.com/docker/buildx/util/progress"
"github.com/moby/buildkit/client"
"github.com/pkg/errors"
appsv1 "k8s.io/api/apps/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
clientappsv1 "k8s.io/client-go/kubernetes/typed/apps/v1"
clientcorev1 "k8s.io/client-go/kubernetes/typed/core/v1"
)
const (
DriverName = "kubernetes"
)
const (
// valid values for driver-opt loadbalance
LoadbalanceRandom = "random"
LoadbalanceSticky = "sticky"
)
type Driver struct {
driver.InitConfig
factory driver.Factory
minReplicas int
deployment *appsv1.Deployment
clientset *kubernetes.Clientset
deploymentClient clientappsv1.DeploymentInterface
podClient clientcorev1.PodInterface
podChooser podchooser.PodChooser
}
func (d *Driver) Bootstrap(ctx context.Context, l progress.Logger) error {
return progress.Wrap("[internal] booting buildkit", l, func(sub progress.SubLogger) error {
_, err := d.deploymentClient.Get(d.deployment.Name, metav1.GetOptions{})
if err != nil {
// TODO: return err if err != ErrNotFound
_, err = d.deploymentClient.Create(d.deployment)
if err != nil {
return errors.Wrapf(err, "error while calling deploymentClient.Create for %q", d.deployment.Name)
}
}
return sub.Wrap(
fmt.Sprintf("waiting for %d pods to be ready", d.minReplicas),
func() error {
if err := d.wait(ctx); err != nil {
return err
}
return nil
})
})
}
func (d *Driver) wait(ctx context.Context) error {
// TODO: use watch API
var (
err error
depl *appsv1.Deployment
)
for try := 0; try < 100; try++ {
depl, err = d.deploymentClient.Get(d.deployment.Name, metav1.GetOptions{})
if err == nil {
if depl.Status.ReadyReplicas >= int32(d.minReplicas) {
return nil
}
err = errors.Errorf("expected %d replicas to be ready, got %d",
d.minReplicas, depl.Status.ReadyReplicas)
}
select {
case <-ctx.Done():
return ctx.Err()
case <-time.After(time.Duration(100+try*20) * time.Millisecond):
}
}
return err
}
func (d *Driver) Info(ctx context.Context) (*driver.Info, error) {
depl, err := d.deploymentClient.Get(d.deployment.Name, metav1.GetOptions{})
if err != nil {
// TODO: return err if err != ErrNotFound
return &driver.Info{
Status: driver.Inactive,
}, nil
}
if depl.Status.ReadyReplicas <= 0 {
return &driver.Info{
Status: driver.Stopped,
}, nil
}
pods, err := podchooser.ListRunningPods(d.podClient, depl)
if err != nil {
return nil, err
}
var dynNodes []store.Node
for _, p := range pods {
node := store.Node{
Name: p.Name,
// Other fields are unset (TODO: detect real platforms)
}
if p.Annotations != nil {
if p, ok := p.Annotations[manifest.AnnotationPlatform]; ok {
ps, err := platformutil.Parse(strings.Split(p, ","))
if err == nil {
node.Platforms = ps
}
}
}
dynNodes = append(dynNodes, node)
}
return &driver.Info{
Status: driver.Running,
DynamicNodes: dynNodes,
}, nil
}
func (d *Driver) Stop(ctx context.Context, force bool) error {
// future version may scale the replicas to zero here
return nil
}
func (d *Driver) Rm(ctx context.Context, force bool) error {
if err := d.deploymentClient.Delete(d.deployment.Name, nil); err != nil {
return errors.Wrapf(err, "error while calling deploymentClient.Delete for %q", d.deployment.Name)
}
return nil
}
func (d *Driver) Client(ctx context.Context) (*client.Client, error) {
restClient := d.clientset.CoreV1().RESTClient()
restClientConfig, err := d.KubeClientConfig.ClientConfig()
if err != nil {
return nil, err
}
pod, err := d.podChooser.ChoosePod(ctx)
if err != nil {
return nil, err
}
if len(pod.Spec.Containers) == 0 {
return nil, errors.Errorf("pod %s does not have any container", pod.Name)
}
containerName := pod.Spec.Containers[0].Name
cmd := []string{"buildctl", "dial-stdio"}
conn, err := execconn.ExecConn(restClient, restClientConfig,
pod.Namespace, pod.Name, containerName, cmd)
if err != nil {
return nil, err
}
return client.New(ctx, "", client.WithContextDialer(func(context.Context, string) (net.Conn, error) {
return conn, nil
}))
}
func (d *Driver) Factory() driver.Factory {
return d.factory
}
func (d *Driver) Features() map[driver.Feature]bool {
return map[driver.Feature]bool{
driver.OCIExporter: true,
driver.DockerExporter: d.DockerAPI != nil,
driver.CacheExport: true,
driver.MultiPlatform: true, // Untested (needs multiple Driver instances)
}
}