store: set nodegroup last activity

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

store/nodegroup.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"fmt"
+	"time"
 
 	"github.com/containerd/containerd/platforms"
 	"github.com/docker/buildx/util/confutil"
@@ -18,7 +19,8 @@ type NodeGroup struct {
 	Dynamic bool
 
 	// skip the following fields from being saved in the store
-	DockerContext bool `json:"-"`
+	DockerContext bool      `json:"-"`
+	LastActivity  time.Time `json:"-"`
 }
 
 type Node struct {

store/store.go

@@ -5,6 +5,7 @@ import (
 	"os"
 	"path/filepath"
 	"sort"
+	"time"
 
 	"github.com/docker/docker/pkg/ioutils"
 	"github.com/gofrs/flock"
@@ -15,6 +16,7 @@ import (
 const (
 	instanceDir = "instances"
 	defaultsDir = "defaults"
+	activityDir = "activity"
 )
 
 func New(root string) (*Store, error) {
@@ -24,6 +26,9 @@ func New(root string) (*Store, error) {
 	if err := os.MkdirAll(filepath.Join(root, defaultsDir), 0700); err != nil {
 		return nil, err
 	}
+	if err := os.MkdirAll(filepath.Join(root, activityDir), 0700); err != nil {
+		return nil, err
+	}
 	return &Store{root: root}, nil
 }
 
@@ -86,6 +91,9 @@ func (t *Txn) NodeGroupByName(name string) (*NodeGroup, error) {
 	if err := json.Unmarshal(dt, &ng); err != nil {
 		return nil, err
 	}
+	if ng.LastActivity, err = t.GetLastActivity(&ng); err != nil {
+		return nil, err
+	}
 	return &ng, nil
 }
 
@@ -94,6 +102,9 @@ func (t *Txn) Save(ng *NodeGroup) error {
 	if err != nil {
 		return err
 	}
+	if err := t.UpdateLastActivity(ng); err != nil {
+		return err
+	}
 	dt, err := json.Marshal(ng)
 	if err != nil {
 		return err
@@ -106,6 +117,9 @@ func (t *Txn) Remove(name string) error {
 	if err != nil {
 		return err
 	}
+	if err := t.RemoveLastActivity(name); err != nil {
+		return err
+	}
 	return os.RemoveAll(filepath.Join(t.s.root, instanceDir, name))
 }
 
@@ -135,6 +149,29 @@ func (t *Txn) SetCurrent(key, name string, global, def bool) error {
 	return nil
 }
 
+func (t *Txn) UpdateLastActivity(ng *NodeGroup) error {
+	return ioutils.AtomicWriteFile(filepath.Join(t.s.root, activityDir, ng.Name), []byte(time.Now().UTC().Format(time.RFC3339)), 0600)
+}
+
+func (t *Txn) GetLastActivity(ng *NodeGroup) (la time.Time, _ error) {
+	dt, err := os.ReadFile(filepath.Join(t.s.root, activityDir, ng.Name))
+	if err != nil {
+		if os.IsNotExist(errors.Cause(err)) {
+			return la, nil
+		}
+		return la, err
+	}
+	return time.Parse(time.RFC3339, string(dt))
+}
+
+func (t *Txn) RemoveLastActivity(name string) error {
+	name, err := ValidateName(name)
+	if err != nil {
+		return err
+	}
+	return os.RemoveAll(filepath.Join(t.s.root, activityDir, name))
+}
+
 func (t *Txn) reset(key string) error {
 	dt, err := json.Marshal(current{Key: key})
 	if err != nil {

store/store_test.go

@@ -92,6 +92,7 @@ func TestNodeManagement(t *testing.T) {
 	require.NoError(t, err)
 	require.Equal(t, "mybuild", ng.Name)
 	require.Equal(t, "mydriver", ng.Driver)
+	require.True(t, !ng.LastActivity.IsZero())
 
 	_, err = txn.NodeGroupByName("mybuild2")
 	require.Error(t, err)

store/storeutil/storeutil.go

@@ -85,7 +85,7 @@ func GetNodeGroup(txn *store.Txn, dockerCli command.Cli, name string) (*store.No
 	}
 	for _, l := range list {
 		if l.Name == name {
-			return &store.NodeGroup{
+			ng = &store.NodeGroup{
 				Name: name,
 				Nodes: []store.Node{
 					{
@@ -93,8 +93,11 @@ func GetNodeGroup(txn *store.Txn, dockerCli command.Cli, name string) (*store.No
 						Endpoint: name,
 					},
 				},
-				DockerContext: true,
-			}, nil
+			}
+			if ng.LastActivity, err = txn.GetLastActivity(ng); err != nil {
+				return nil, err
+			}
+			return ng, nil
 		}
 	}