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service.go
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service.go
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package leases
import (
"crypto/rand"
"encoding/base64"
"fmt"
"time"
"google.golang.org/grpc"
"github.com/boltdb/bolt"
api "github.com/containerd/containerd/api/services/leases/v1"
"github.com/containerd/containerd/metadata"
"github.com/containerd/containerd/plugin"
ptypes "github.com/gogo/protobuf/types"
"golang.org/x/net/context"
)
func init() {
plugin.Register(&plugin.Registration{
Type: plugin.GRPCPlugin,
ID: "leases",
Requires: []plugin.Type{
plugin.MetadataPlugin,
},
InitFn: func(ic *plugin.InitContext) (interface{}, error) {
m, err := ic.Get(plugin.MetadataPlugin)
if err != nil {
return nil, err
}
return NewService(m.(*metadata.DB)), nil
},
})
}
type service struct {
db *metadata.DB
}
// NewService returns the GRPC metadata server
func NewService(db *metadata.DB) api.LeasesServer {
return &service{
db: db,
}
}
func (s *service) Register(server *grpc.Server) error {
api.RegisterLeasesServer(server, s)
return nil
}
func (s *service) Create(ctx context.Context, r *api.CreateRequest) (*api.CreateResponse, error) {
lid := r.ID
if lid == "" {
lid = generateLeaseID()
}
var trans metadata.Lease
if err := s.db.Update(func(tx *bolt.Tx) error {
var err error
trans, err = metadata.NewLeaseManager(tx).Create(ctx, lid, r.Labels)
return err
}); err != nil {
return nil, err
}
return &api.CreateResponse{
Lease: txToGRPC(trans),
}, nil
}
func (s *service) Delete(ctx context.Context, r *api.DeleteRequest) (*ptypes.Empty, error) {
if err := s.db.Update(func(tx *bolt.Tx) error {
return metadata.NewLeaseManager(tx).Delete(ctx, r.ID)
}); err != nil {
return nil, err
}
return &ptypes.Empty{}, nil
}
func (s *service) List(ctx context.Context, r *api.ListRequest) (*api.ListResponse, error) {
var leases []metadata.Lease
if err := s.db.View(func(tx *bolt.Tx) error {
var err error
leases, err = metadata.NewLeaseManager(tx).List(ctx, false, r.Filters...)
return err
}); err != nil {
return nil, err
}
apileases := make([]*api.Lease, len(leases))
for i := range leases {
apileases[i] = txToGRPC(leases[i])
}
return &api.ListResponse{
Leases: apileases,
}, nil
}
func txToGRPC(tx metadata.Lease) *api.Lease {
return &api.Lease{
ID: tx.ID,
Labels: tx.Labels,
CreatedAt: tx.CreatedAt,
// TODO: Snapshots
// TODO: Content
}
}
func generateLeaseID() string {
t := time.Now()
var b [3]byte
// Ignore read failures, just decreases uniqueness
rand.Read(b[:])
return fmt.Sprintf("%d-%s", t.Nanosecond(), base64.URLEncoding.EncodeToString(b[:]))
}