Merge pull request #8358 from gyuho/lease-list

api: lease list

Documentation/dev-guide/api_reference_v3.md

@@ -58,6 +58,7 @@ This is a generated documentation. Please read the proto files for more.
 | LeaseRevoke | LeaseRevokeRequest | LeaseRevokeResponse | LeaseRevoke revokes a lease. All keys attached to the lease will expire and be deleted. |
 | LeaseKeepAlive | LeaseKeepAliveRequest | LeaseKeepAliveResponse | LeaseKeepAlive keeps the lease alive by streaming keep alive requests from the client to the server and streaming keep alive responses from the server to the client. |
 | LeaseTimeToLive | LeaseTimeToLiveRequest | LeaseTimeToLiveResponse | LeaseTimeToLive retrieves lease information. |
+| LeaseLeases | LeaseLeasesRequest | LeaseLeasesResponse | LeaseLeases lists all existing leases. |
 
 
 
@@ -513,6 +514,21 @@ Empty field.
 
 
 
+##### message `LeaseLeasesRequest` (etcdserver/etcdserverpb/rpc.proto)
+
+Empty field.
+
+
+
+##### message `LeaseLeasesResponse` (etcdserver/etcdserverpb/rpc.proto)
+
+| Field | Description | Type |
+| ----- | ----------- | ---- |
+| header |  | ResponseHeader |
+| leases |  | (slice of) LeaseStatus |
+
+
+
 ##### message `LeaseRevokeRequest` (etcdserver/etcdserverpb/rpc.proto)
 
 | Field | Description | Type |
@@ -529,6 +545,14 @@ Empty field.
 
 
 
+##### message `LeaseStatus` (etcdserver/etcdserverpb/rpc.proto)
+
+| Field | Description | Type |
+| ----- | ----------- | ---- |
+| ID |  | int64 |
+
+
+
 ##### message `LeaseTimeToLiveRequest` (etcdserver/etcdserverpb/rpc.proto)
 
 | Field | Description | Type |

Documentation/dev-guide/apispec/swagger/rpc.swagger.json

@@ -609,6 +609,33 @@
         }
       }
     },
+    "/v3alpha/kv/lease/leases": {
+      "post": {
+        "tags": [
+          "Lease"
+        ],
+        "summary": "LeaseLeases lists all existing leases.",
+        "operationId": "LeaseLeases",
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/etcdserverpbLeaseLeasesRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "(empty)",
+            "schema": {
+              "$ref": "#/definitions/etcdserverpbLeaseLeasesResponse"
+            }
+          }
+        }
+      }
+    },
     "/v3alpha/kv/lease/revoke": {
       "post": {
         "tags": [
@@ -1666,6 +1693,23 @@
         }
       }
     },
+    "etcdserverpbLeaseLeasesRequest": {
+      "type": "object"
+    },
+    "etcdserverpbLeaseLeasesResponse": {
+      "type": "object",
+      "properties": {
+        "header": {
+          "$ref": "#/definitions/etcdserverpbResponseHeader"
+        },
+        "leases": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/etcdserverpbLeaseStatus"
+          }
+        }
+      }
+    },
     "etcdserverpbLeaseRevokeRequest": {
       "type": "object",
       "properties": {
@@ -1684,6 +1728,15 @@
         }
       }
     },
+    "etcdserverpbLeaseStatus": {
+      "type": "object",
+      "properties": {
+        "ID": {
+          "type": "string",
+          "format": "int64"
+        }
+      }
+    },
     "etcdserverpbLeaseTimeToLiveRequest": {
       "type": "object",
       "properties": {

clientv3/integration/lease_test.go

@@ -574,6 +574,37 @@ func TestLeaseTimeToLiveLeaseNotFound(t *testing.T) {
 	}
 }
 
+func TestLeaseLeases(t *testing.T) {
+	defer testutil.AfterTest(t)
+
+	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 1})
+	defer clus.Terminate(t)
+
+	cli := clus.RandClient()
+
+	ids := []clientv3.LeaseID{}
+	for i := 0; i < 5; i++ {
+		resp, err := cli.Grant(context.Background(), 10)
+		if err != nil {
+			t.Errorf("failed to create lease %v", err)
+		}
+		ids = append(ids, resp.ID)
+	}
+
+	resp, err := cli.Leases(context.Background())
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(resp.Leases) != 5 {
+		t.Fatalf("len(resp.Leases) expected 5, got %d", len(resp.Leases))
+	}
+	for i := range resp.Leases {
+		if ids[i] != resp.Leases[i].ID {
+			t.Fatalf("#%d: lease ID expected %d, got %d", i, ids[i], resp.Leases[i].ID)
+		}
+	}
+}
+
 // TestLeaseRenewLostQuorum ensures keepalives work after losing quorum
 // for a while.
 func TestLeaseRenewLostQuorum(t *testing.T) {

clientv3/lease.go

@@ -60,6 +60,18 @@ type LeaseTimeToLiveResponse struct {
 	Keys [][]byte `json:"keys"`
 }
 
+// LeaseStatus represents a lease status.
+type LeaseStatus struct {
+	ID LeaseID `json:"id"`
+	// TODO: TTL int64
+}
+
+// LeaseLeasesResponse is used to convert the protobuf lease list response.
+type LeaseLeasesResponse struct {
+	*pb.ResponseHeader
+	Leases []LeaseStatus `json:"leases"`
+}
+
 const (
 	// defaultTTL is the assumed lease TTL used for the first keepalive
 	// deadline before the actual TTL is known to the client.
@@ -98,6 +110,9 @@ type Lease interface {
 	// TimeToLive retrieves the lease information of the given lease ID.
 	TimeToLive(ctx context.Context, id LeaseID, opts ...LeaseOption) (*LeaseTimeToLiveResponse, error)
 
+	// Leases retrieves all leases.
+	Leases(ctx context.Context) (*LeaseLeasesResponse, error)
+
 	// KeepAlive keeps the given lease alive forever.
 	KeepAlive(ctx context.Context, id LeaseID) (<-chan *LeaseKeepAliveResponse, error)
 
@@ -219,6 +234,22 @@ func (l *lessor) TimeToLive(ctx context.Context, id LeaseID, opts ...LeaseOption
 	}
 }
 
+func (l *lessor) Leases(ctx context.Context) (*LeaseLeasesResponse, error) {
+	for {
+		resp, err := l.remote.LeaseLeases(ctx, &pb.LeaseLeasesRequest{}, grpc.FailFast(false))
+		if err == nil {
+			leases := make([]LeaseStatus, len(resp.Leases))
+			for i := range resp.Leases {
+				leases[i] = LeaseStatus{ID: LeaseID(resp.Leases[i].ID)}
+			}
+			return &LeaseLeasesResponse{ResponseHeader: resp.GetHeader(), Leases: leases}, nil
+		}
+		if isHaltErr(ctx, err) {
+			return nil, toErr(ctx, err)
+		}
+	}
+}
+
 func (l *lessor) KeepAlive(ctx context.Context, id LeaseID) (<-chan *LeaseKeepAliveResponse, error) {
 	ch := make(chan *LeaseKeepAliveResponse, leaseResponseChSize)
 

e2e/ctl_v3_lease_test.go

@@ -22,6 +22,7 @@ import (
 )
 
 func TestCtlV3LeaseGrantTimeToLive(t *testing.T) { testCtl(t, leaseTestGrantTimeToLive) }
+func TestCtlV3LeaseGrantLeases(t *testing.T)     { testCtl(t, leaseTestGrantLeasesList) }
 func TestCtlV3LeaseKeepAlive(t *testing.T)       { testCtl(t, leaseTestKeepAlive) }
 func TestCtlV3LeaseRevoke(t *testing.T)          { testCtl(t, leaseTestRevoke) }
 
@@ -51,6 +52,26 @@ func leaseTestGrantTimeToLive(cx ctlCtx) {
 	}
 }
 
+func leaseTestGrantLeasesList(cx ctlCtx) {
+	id, err := ctlV3LeaseGrant(cx, 10)
+	if err != nil {
+		cx.t.Fatal(err)
+	}
+
+	cmdArgs := append(cx.PrefixArgs(), "lease", "list")
+	proc, err := spawnCmd(cmdArgs)
+	if err != nil {
+		cx.t.Fatal(err)
+	}
+	_, err = proc.Expect(id)
+	if err != nil {
+		cx.t.Fatal(err)
+	}
+	if err = proc.Close(); err != nil {
+		cx.t.Fatal(err)
+	}
+}
+
 func leaseTestKeepAlive(cx ctlCtx) {
 	// put with TTL 10 seconds and keep-alive
 	leaseID, err := ctlV3LeaseGrant(cx, 10)

etcdctl/README.md

@@ -439,6 +439,26 @@ Prints lease information.
 # {"cluster_id":17186838941855831277,"member_id":4845372305070271874,"revision":3,"raft_term":2,"id":3279279168933706764,"ttl":459,"granted-ttl":500,"keys":["Zm9vMQ==","Zm9vMg=="]}
 ```
 
+### LEASE LIST
+
+LEASE LIST lists all active leases.
+
+RPC: LeaseLeases
+
+#### Output
+
+Prints a message with a list of active leases.
+
+#### Example
+
+```bash
+./etcdctl lease grant 10
+# lease 32695410dcc0ca06 granted with TTL(10s)
+
+./etcdctl lease list
+32695410dcc0ca06
+```
+
 ### LEASE KEEP-ALIVE \<leaseID\>
 
 LEASE KEEP-ALIVE periodically refreshes a lease so it does not expire.
@@ -736,9 +756,9 @@ If NOSPACE alarm is present:
 
 ### DEFRAG [options]
 
-DEFRAG defragments the backend database file for a set of given endpoints while etcd is running, or directly defragments an 
+DEFRAG defragments the backend database file for a set of given endpoints while etcd is running, or directly defragments an
-etcd data directory while etcd is not running. When an etcd member reclaims storage space from deleted and compacted keys, the 
+etcd data directory while etcd is not running. When an etcd member reclaims storage space from deleted and compacted keys, the
-space is kept in a free list and the database file remains the same size. By defragmenting the database, the etcd member 
+space is kept in a free list and the database file remains the same size. By defragmenting the database, the etcd member
 releases this free space back to the file system.
 
 #### Options

etcdctl/ctlv3/command/lease_command.go

@@ -33,6 +33,7 @@ func NewLeaseCommand() *cobra.Command {
 	lc.AddCommand(NewLeaseGrantCommand())
 	lc.AddCommand(NewLeaseRevokeCommand())
 	lc.AddCommand(NewLeaseTimeToLiveCommand())
+	lc.AddCommand(NewLeaseListCommand())
 	lc.AddCommand(NewLeaseKeepAliveCommand())
 
 	return lc
@@ -129,6 +130,25 @@ func leaseTimeToLiveCommandFunc(cmd *cobra.Command, args []string) {
 	display.TimeToLive(*resp, timeToLiveKeys)
 }
 
+// NewLeaseListCommand returns the cobra command for "lease list".
+func NewLeaseListCommand() *cobra.Command {
+	lc := &cobra.Command{
+		Use:   "list",
+		Short: "List all active leases",
+		Run:   leaseListCommandFunc,
+	}
+	return lc
+}
+
+// leaseListCommandFunc executes the "lease list" command.
+func leaseListCommandFunc(cmd *cobra.Command, args []string) {
+	resp, rerr := mustClientFromCmd(cmd).Leases(context.TODO())
+	if rerr != nil {
+		ExitWithError(ExitBadConnection, rerr)
+	}
+	display.Leases(*resp)
+}
+
 // NewLeaseKeepAliveCommand returns the cobra command for "lease keep-alive".
 func NewLeaseKeepAliveCommand() *cobra.Command {
 	lc := &cobra.Command{

etcdctl/ctlv3/command/printer.go

@@ -36,6 +36,7 @@ type printer interface {
 	Revoke(id v3.LeaseID, r v3.LeaseRevokeResponse)
 	KeepAlive(r v3.LeaseKeepAliveResponse)
 	TimeToLive(r v3.LeaseTimeToLiveResponse, keys bool)
+	Leases(r v3.LeaseLeasesResponse)
 
 	MemberAdd(v3.MemberAddResponse)
 	MemberRemove(id uint64, r v3.MemberRemoveResponse)
@@ -96,6 +97,7 @@ func (p *printerRPC) Grant(r v3.LeaseGrantResponse)                      { p.p(r
 func (p *printerRPC) Revoke(id v3.LeaseID, r v3.LeaseRevokeResponse)     { p.p(r) }
 func (p *printerRPC) KeepAlive(r v3.LeaseKeepAliveResponse)              { p.p(r) }
 func (p *printerRPC) TimeToLive(r v3.LeaseTimeToLiveResponse, keys bool) { p.p(&r) }
+func (p *printerRPC) Leases(r v3.LeaseLeasesResponse)                    { p.p(&r) }
 
 func (p *printerRPC) MemberAdd(r v3.MemberAddResponse) { p.p((*pb.MemberAddResponse)(&r)) }
 func (p *printerRPC) MemberRemove(id uint64, r v3.MemberRemoveResponse) {

etcdctl/ctlv3/command/printer_fields.go

@@ -118,6 +118,13 @@ func (p *fieldsPrinter) TimeToLive(r v3.LeaseTimeToLiveResponse, keys bool) {
 	}
 }
 
+func (p *fieldsPrinter) Leases(r v3.LeaseLeasesResponse) {
+	p.hdr(r.ResponseHeader)
+	for _, item := range r.Leases {
+		fmt.Println(`"ID" :`, item.ID)
+	}
+}
+
 func (p *fieldsPrinter) MemberList(r v3.MemberListResponse) {
 	p.hdr(r.Header)
 	for _, m := range r.Members {

etcdctl/ctlv3/command/printer_simple.go

@@ -104,6 +104,13 @@ func (s *simplePrinter) TimeToLive(resp v3.LeaseTimeToLiveResponse, keys bool) {
 	fmt.Println(txt)
 }
 
+func (s *simplePrinter) Leases(resp v3.LeaseLeasesResponse) {
+	fmt.Printf("found %d leases\n", len(resp.Leases))
+	for _, item := range resp.Leases {
+		fmt.Printf("%016x\n", item.ID)
+	}
+}
+
 func (s *simplePrinter) Alarm(resp v3.AlarmResponse) {
 	for _, e := range resp.Alarms {
 		fmt.Printf("%+v\n", e)

etcdserver/api/v3rpc/lease.go

@@ -68,6 +68,21 @@ func (ls *LeaseServer) LeaseTimeToLive(ctx context.Context, rr *pb.LeaseTimeToLi
 	return resp, nil
 }
 
+func (ls *LeaseServer) LeaseLeases(ctx context.Context, rr *pb.LeaseLeasesRequest) (*pb.LeaseLeasesResponse, error) {
+	resp, err := ls.le.LeaseLeases(ctx, rr)
+	if err != nil && err != lease.ErrLeaseNotFound {
+		return nil, togRPCError(err)
+	}
+	if err == lease.ErrLeaseNotFound {
+		resp = &pb.LeaseLeasesResponse{
+			Header: &pb.ResponseHeader{},
+			Leases: []*pb.LeaseStatus{},
+		}
+	}
+	ls.hdr.fill(resp.Header)
+	return resp, nil
+}
+
 func (ls *LeaseServer) LeaseKeepAlive(stream pb.Lease_LeaseKeepAliveServer) (err error) {
 	errc := make(chan error, 1)
 	go func() {

etcdserver/etcdserverpb/etcdserver.pb.go

@@ -49,6 +49,9 @@
 		LeaseKeepAliveResponse
 		LeaseTimeToLiveRequest
 		LeaseTimeToLiveResponse
+		LeaseLeasesRequest
+		LeaseStatus
+		LeaseLeasesResponse
 		Member
 		MemberAddRequest
 		MemberAddResponse

etcdserver/etcdserverpb/gw/rpc.pb.gw.go

@@ -236,6 +236,19 @@ func request_Lease_LeaseTimeToLive_0(ctx context.Context, marshaler runtime.Mars
 
 }
 
+func request_Lease_LeaseLeases_0(ctx context.Context, marshaler runtime.Marshaler, client etcdserverpb.LeaseClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
+	var protoReq etcdserverpb.LeaseLeasesRequest
+	var metadata runtime.ServerMetadata
+
+	if err := marshaler.NewDecoder(req.Body).Decode(&protoReq); err != nil {
+		return nil, metadata, grpc.Errorf(codes.InvalidArgument, "%v", err)
+	}
+
+	msg, err := client.LeaseLeases(ctx, &protoReq, grpc.Header(&metadata.HeaderMD), grpc.Trailer(&metadata.TrailerMD))
+	return msg, metadata, err
+
+}
+
 func request_Cluster_MemberAdd_0(ctx context.Context, marshaler runtime.Marshaler, client etcdserverpb.ClusterClient, req *http.Request, pathParams map[string]string) (proto.Message, runtime.ServerMetadata, error) {
 	var protoReq etcdserverpb.MemberAddRequest
 	var metadata runtime.ServerMetadata
@@ -1003,6 +1016,34 @@ func RegisterLeaseHandler(ctx context.Context, mux *runtime.ServeMux, conn *grpc
 
 	})
 
+	mux.Handle("POST", pattern_Lease_LeaseLeases_0, func(w http.ResponseWriter, req *http.Request, pathParams map[string]string) {
+		ctx, cancel := context.WithCancel(ctx)
+		defer cancel()
+		if cn, ok := w.(http.CloseNotifier); ok {
+			go func(done <-chan struct{}, closed <-chan bool) {
+				select {
+				case <-done:
+				case <-closed:
+					cancel()
+				}
+			}(ctx.Done(), cn.CloseNotify())
+		}
+		inboundMarshaler, outboundMarshaler := runtime.MarshalerForRequest(mux, req)
+		rctx, err := runtime.AnnotateContext(ctx, req)
+		if err != nil {
+			runtime.HTTPError(ctx, outboundMarshaler, w, req, err)
+		}
+		resp, md, err := request_Lease_LeaseLeases_0(rctx, inboundMarshaler, client, req, pathParams)
+		ctx = runtime.NewServerMetadataContext(ctx, md)
+		if err != nil {
+			runtime.HTTPError(ctx, outboundMarshaler, w, req, err)
+			return
+		}
+
+		forward_Lease_LeaseLeases_0(ctx, outboundMarshaler, w, req, resp, mux.GetForwardResponseOptions()...)
+
+	})
+
 	return nil
 }
 
@@ -1014,6 +1055,8 @@ var (
 	pattern_Lease_LeaseKeepAlive_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2}, []string{"v3alpha", "lease", "keepalive"}, ""))
 
 	pattern_Lease_LeaseTimeToLive_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3}, []string{"v3alpha", "kv", "lease", "timetolive"}, ""))
+
+	pattern_Lease_LeaseLeases_0 = runtime.MustPattern(runtime.NewPattern(1, []int{2, 0, 2, 1, 2, 2, 2, 3}, []string{"v3alpha", "kv", "lease", "leases"}, ""))
 )
 
 var (
@@ -1024,6 +1067,8 @@ var (
 	forward_Lease_LeaseKeepAlive_0 = runtime.ForwardResponseStream
 
 	forward_Lease_LeaseTimeToLive_0 = runtime.ForwardResponseMessage
+
+	forward_Lease_LeaseLeases_0 = runtime.ForwardResponseMessage
 )
 
 // RegisterClusterHandlerFromEndpoint is same as RegisterClusterHandler but

etcdserver/etcdserverpb/rpc.proto

@@ -112,7 +112,13 @@ service Lease {
     };
   }
 
-  // TODO(xiangli) List all existing Leases?
+  // LeaseLeases lists all existing leases.
+  rpc LeaseLeases(LeaseLeasesRequest) returns (LeaseLeasesResponse) {
+      option (google.api.http) = {
+        post: "/v3alpha/kv/lease/leases"
+        body: "*"
+    };
+  }
 }
 
 service Cluster {
@@ -184,7 +190,7 @@ service Maintenance {
     };
   }
 
-  // HashKV computes the hash of all MVCC keys up to a given revision. 
+  // HashKV computes the hash of all MVCC keys up to a given revision.
   rpc HashKV(HashKVRequest) returns (HashKVResponse) {
       option (google.api.http) = {
         post: "/v3alpha/maintenance/hash"
@@ -757,6 +763,19 @@ message LeaseTimeToLiveResponse {
   repeated bytes keys = 5;
 }
 
+message LeaseLeasesRequest {
+}
+
+message LeaseStatus {
+  int64 ID = 1;
+  // TODO: int64 TTL = 2;
+}
+
+message LeaseLeasesResponse {
+  ResponseHeader header = 1;
+  repeated LeaseStatus leases = 2;
+}
+
 message Member {
   // ID is the member ID for this member.
   uint64 ID = 1;

etcdserver/v3_server.go

@@ -60,6 +60,9 @@ type Lessor interface {
 
 	// LeaseTimeToLive retrieves lease information.
 	LeaseTimeToLive(ctx context.Context, r *pb.LeaseTimeToLiveRequest) (*pb.LeaseTimeToLiveResponse, error)
+
+	// LeaseLeases lists all leases.
+	LeaseLeases(ctx context.Context, r *pb.LeaseLeasesRequest) (*pb.LeaseLeasesResponse, error)
 }
 
 type Authenticator interface {
@@ -291,6 +294,15 @@ func (s *EtcdServer) LeaseTimeToLive(ctx context.Context, r *pb.LeaseTimeToLiveR
 	return nil, ErrTimeout
 }
 
+func (s *EtcdServer) LeaseLeases(ctx context.Context, r *pb.LeaseLeasesRequest) (*pb.LeaseLeasesResponse, error) {
+	ls := s.lessor.Leases()
+	lss := make([]*pb.LeaseStatus, len(ls))
+	for i := range ls {
+		lss[i] = &pb.LeaseStatus{ID: int64(ls[i].ID)}
+	}
+	return &pb.LeaseLeasesResponse{Header: newHeader(s), Leases: lss}, nil
+}
+
 func (s *EtcdServer) waitLeader(ctx context.Context) (*membership.Member, error) {
 	leader := s.cluster.Member(s.Leader())
 	for leader == nil {

integration/v3_lease_test.go

@@ -234,6 +234,43 @@ func TestV3LeaseExists(t *testing.T) {
 	}
 }
 
+// TestV3LeaseLeases creates leases and confirms list RPC fetches created ones.
+func TestV3LeaseLeases(t *testing.T) {
+	defer testutil.AfterTest(t)
+	clus := NewClusterV3(t, &ClusterConfig{Size: 1})
+	defer clus.Terminate(t)
+
+	ctx0, cancel0 := context.WithCancel(context.Background())
+	defer cancel0()
+
+	// create leases
+	ids := []int64{}
+	for i := 0; i < 5; i++ {
+		lresp, err := toGRPC(clus.RandClient()).Lease.LeaseGrant(
+			ctx0,
+			&pb.LeaseGrantRequest{TTL: 30})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if lresp.Error != "" {
+			t.Fatal(lresp.Error)
+		}
+		ids = append(ids, lresp.ID)
+	}
+
+	lresp, err := toGRPC(clus.RandClient()).Lease.LeaseLeases(
+		context.Background(),
+		&pb.LeaseLeasesRequest{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i := range lresp.Leases {
+		if lresp.Leases[i].ID != ids[i] {
+			t.Fatalf("#%d: lease ID expected %d, got %d", i, ids[i], lresp.Leases[i].ID)
+		}
+	}
+}
+
 // TestV3LeaseRenewStress keeps creating lease and renewing it immediately to ensure the renewal goes through.
 // it was oberserved that the immediate lease renewal after granting a lease from follower resulted lease not found.
 // related issue https://github.com/coreos/etcd/issues/6978

lease/lessor.go

@@ -99,6 +99,9 @@ type Lessor interface {
 	// Lookup gives the lease at a given lease id, if any
 	Lookup(id LeaseID) *Lease
 
+	// Leases lists all leases.
+	Leases() []*Lease
+
 	// ExpiredLeasesC returns a chan that is used to receive expired leases.
 	ExpiredLeasesC() <-chan []*Lease
 
@@ -317,6 +320,22 @@ func (le *lessor) Lookup(id LeaseID) *Lease {
 	return le.leaseMap[id]
 }
 
+func (le *lessor) unsafeLeases() []*Lease {
+	leases := make([]*Lease, 0, len(le.leaseMap))
+	for _, l := range le.leaseMap {
+		leases = append(leases, l)
+	}
+	sort.Sort(leasesByExpiry(leases))
+	return leases
+}
+
+func (le *lessor) Leases() []*Lease {
+	le.mu.Lock()
+	ls := le.unsafeLeases()
+	le.mu.Unlock()
+	return ls
+}
+
 func (le *lessor) Promote(extend time.Duration) {
 	le.mu.Lock()
 	defer le.mu.Unlock()
@@ -334,11 +353,7 @@ func (le *lessor) Promote(extend time.Duration) {
 	}
 
 	// adjust expiries in case of overlap
-	leases := make([]*Lease, 0, len(le.leaseMap))
+	leases := le.unsafeLeases()
-	for _, l := range le.leaseMap {
-		leases = append(leases, l)
-	}
-	sort.Sort(leasesByExpiry(leases))
 
 	baseWindow := leases[0].Remaining()
 	nextWindow := baseWindow + time.Second
@@ -636,6 +651,8 @@ func (fl *FakeLessor) Renew(id LeaseID) (int64, error) { return 10, nil }
 
 func (le *FakeLessor) Lookup(id LeaseID) *Lease { return nil }
 
+func (le *FakeLessor) Leases() []*Lease { return nil }
+
 func (fl *FakeLessor) ExpiredLeasesC() <-chan []*Lease { return nil }
 
 func (fl *FakeLessor) Recover(b backend.Backend, rd RangeDeleter) {}

lease/lessor_test.go

@@ -72,6 +72,17 @@ func TestLessorGrant(t *testing.T) {
 		t.Errorf("new lease.id = %x, want != %x", nl.ID, l.ID)
 	}
 
+	lss := []*Lease{gl, nl}
+	leases := le.Leases()
+	for i := range lss {
+		if lss[i].ID != leases[i].ID {
+			t.Fatalf("lease ID expected %d, got %d", lss[i].ID, leases[i].ID)
+		}
+		if lss[i].ttl != leases[i].ttl {
+			t.Fatalf("ttl expected %d, got %d", lss[i].ttl, leases[i].ttl)
+		}
+	}
+
 	be.BatchTx().Lock()
 	_, vs := be.BatchTx().UnsafeRange(leaseBucketName, int64ToBytes(int64(l.ID)), nil, 0)
 	if len(vs) != 1 {

proxy/grpcproxy/adapter/lease_client_adapter.go

@@ -48,6 +48,10 @@ func (c *ls2lc) LeaseTimeToLive(ctx context.Context, in *pb.LeaseTimeToLiveReque
 	return c.leaseServer.LeaseTimeToLive(ctx, in)
 }
 
+func (c *ls2lc) LeaseLeases(ctx context.Context, in *pb.LeaseLeasesRequest, opts ...grpc.CallOption) (*pb.LeaseLeasesResponse, error) {
+	return c.leaseServer.LeaseLeases(ctx, in)
+}
+
 // ls2lcClientStream implements Lease_LeaseKeepAliveClient
 type ls2lcClientStream struct{ chanClientStream }
 

proxy/grpcproxy/lease.go

@@ -113,6 +113,22 @@ func (lp *leaseProxy) LeaseTimeToLive(ctx context.Context, rr *pb.LeaseTimeToLiv
 	return rp, err
 }
 
+func (lp *leaseProxy) LeaseLeases(ctx context.Context, rr *pb.LeaseLeasesRequest) (*pb.LeaseLeasesResponse, error) {
+	r, err := lp.lessor.Leases(ctx)
+	if err != nil {
+		return nil, err
+	}
+	leases := make([]*pb.LeaseStatus, len(r.Leases))
+	for i := range r.Leases {
+		leases[i] = &pb.LeaseStatus{ID: int64(r.Leases[i].ID)}
+	}
+	rp := &pb.LeaseLeasesResponse{
+		Header: r.ResponseHeader,
+		Leases: leases,
+	}
+	return rp, err
+}
+
 func (lp *leaseProxy) LeaseKeepAlive(stream pb.Lease_LeaseKeepAliveServer) error {
 	lp.mu.Lock()
 	select {