add master side code for cluster wise exclusive lock

weed/pb/master.proto

@@ -27,6 +27,13 @@ service Seaweed {
     }
     rpc ListMasterClients (ListMasterClientsRequest) returns (ListMasterClientsResponse) {
     }
+    rpc LeaseAdminToken (LeaseAdminTokenRequest) returns (LeaseAdminTokenResponse) {
+    }
+    rpc ReleaseAdminToken (ReleaseAdminTokenRequest) returns (ReleaseAdminTokenResponse) {
+    }
+    rpc VerifyAdminToken (VerifyAdminTokenRequest) returns (VerifyAdminTokenResponse) {
+    }
+
 }
 
 //////////////////////////////////////////////////
@@ -274,3 +281,29 @@ message ListMasterClientsRequest {
 message ListMasterClientsResponse {
     repeated string grpc_addresses = 1;
 }
+
+message LeaseAdminTokenRequest {
+    int64 previous_token = 1;
+    int64 previous_lock_time = 2;
+}
+message LeaseAdminTokenResponse {
+    bool is_allowed = 1;
+    string error = 2;
+    int64 lock_ts_ns = 3;
+    int64 token = 4;
+}
+
+message ReleaseAdminTokenRequest {
+    int64 previous_token = 1;
+    int64 previous_lock_time = 2;
+}
+message ReleaseAdminTokenResponse {
+}
+
+message VerifyAdminTokenRequest {
+    int64 token = 1;
+    int64 lock_time = 2;
+}
+message VerifyAdminTokenResponse {
+    bool is_valid = 1;
+}

weed/pb/master_pb/master.pb.go

@@ -44,6 +44,12 @@ It has these top-level messages:
 	GetMasterConfigurationResponse
 	ListMasterClientsRequest
 	ListMasterClientsResponse
+	LeaseAdminTokenRequest
+	LeaseAdminTokenResponse
+	ReleaseAdminTokenRequest
+	ReleaseAdminTokenResponse
+	VerifyAdminTokenRequest
+	VerifyAdminTokenResponse
 */
 package master_pb
 
@@ -431,9 +437,7 @@ type VolumeEcShardInformationMessage struct {
 func (m *VolumeEcShardInformationMessage) Reset()                    { *m = VolumeEcShardInformationMessage{} }
 func (m *VolumeEcShardInformationMessage) String() string            { return proto.CompactTextString(m) }
 func (*VolumeEcShardInformationMessage) ProtoMessage()               {}
-func (*VolumeEcShardInformationMessage) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{4}
-}
+func (*VolumeEcShardInformationMessage) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{4} }
 
 func (m *VolumeEcShardInformationMessage) GetId() uint32 {
 	if m != nil {
@@ -1427,9 +1431,7 @@ type GetMasterConfigurationResponse struct {
 func (m *GetMasterConfigurationResponse) Reset()                    { *m = GetMasterConfigurationResponse{} }
 func (m *GetMasterConfigurationResponse) String() string            { return proto.CompactTextString(m) }
 func (*GetMasterConfigurationResponse) ProtoMessage()               {}
-func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor0, []int{32}
-}
+func (*GetMasterConfigurationResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{32} }
 
 func (m *GetMasterConfigurationResponse) GetMetricsAddress() string {
 	if m != nil {
@@ -1477,6 +1479,142 @@ func (m *ListMasterClientsResponse) GetGrpcAddresses() []string {
 	return nil
 }
 
+type LeaseAdminTokenRequest struct {
+	PreviousToken    int64 `protobuf:"varint,1,opt,name=previous_token,json=previousToken" json:"previous_token,omitempty"`
+	PreviousLockTime int64 `protobuf:"varint,2,opt,name=previous_lock_time,json=previousLockTime" json:"previous_lock_time,omitempty"`
+}
+
+func (m *LeaseAdminTokenRequest) Reset()                    { *m = LeaseAdminTokenRequest{} }
+func (m *LeaseAdminTokenRequest) String() string            { return proto.CompactTextString(m) }
+func (*LeaseAdminTokenRequest) ProtoMessage()               {}
+func (*LeaseAdminTokenRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{35} }
+
+func (m *LeaseAdminTokenRequest) GetPreviousToken() int64 {
+	if m != nil {
+		return m.PreviousToken
+	}
+	return 0
+}
+
+func (m *LeaseAdminTokenRequest) GetPreviousLockTime() int64 {
+	if m != nil {
+		return m.PreviousLockTime
+	}
+	return 0
+}
+
+type LeaseAdminTokenResponse struct {
+	IsAllowed bool   `protobuf:"varint,1,opt,name=is_allowed,json=isAllowed" json:"is_allowed,omitempty"`
+	Error     string `protobuf:"bytes,2,opt,name=error" json:"error,omitempty"`
+	LockTsNs  int64  `protobuf:"varint,3,opt,name=lock_ts_ns,json=lockTsNs" json:"lock_ts_ns,omitempty"`
+	Token     int64  `protobuf:"varint,4,opt,name=token" json:"token,omitempty"`
+}
+
+func (m *LeaseAdminTokenResponse) Reset()                    { *m = LeaseAdminTokenResponse{} }
+func (m *LeaseAdminTokenResponse) String() string            { return proto.CompactTextString(m) }
+func (*LeaseAdminTokenResponse) ProtoMessage()               {}
+func (*LeaseAdminTokenResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{36} }
+
+func (m *LeaseAdminTokenResponse) GetIsAllowed() bool {
+	if m != nil {
+		return m.IsAllowed
+	}
+	return false
+}
+
+func (m *LeaseAdminTokenResponse) GetError() string {
+	if m != nil {
+		return m.Error
+	}
+	return ""
+}
+
+func (m *LeaseAdminTokenResponse) GetLockTsNs() int64 {
+	if m != nil {
+		return m.LockTsNs
+	}
+	return 0
+}
+
+func (m *LeaseAdminTokenResponse) GetToken() int64 {
+	if m != nil {
+		return m.Token
+	}
+	return 0
+}
+
+type ReleaseAdminTokenRequest struct {
+	PreviousToken    int64 `protobuf:"varint,1,opt,name=previous_token,json=previousToken" json:"previous_token,omitempty"`
+	PreviousLockTime int64 `protobuf:"varint,2,opt,name=previous_lock_time,json=previousLockTime" json:"previous_lock_time,omitempty"`
+}
+
+func (m *ReleaseAdminTokenRequest) Reset()                    { *m = ReleaseAdminTokenRequest{} }
+func (m *ReleaseAdminTokenRequest) String() string            { return proto.CompactTextString(m) }
+func (*ReleaseAdminTokenRequest) ProtoMessage()               {}
+func (*ReleaseAdminTokenRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{37} }
+
+func (m *ReleaseAdminTokenRequest) GetPreviousToken() int64 {
+	if m != nil {
+		return m.PreviousToken
+	}
+	return 0
+}
+
+func (m *ReleaseAdminTokenRequest) GetPreviousLockTime() int64 {
+	if m != nil {
+		return m.PreviousLockTime
+	}
+	return 0
+}
+
+type ReleaseAdminTokenResponse struct {
+}
+
+func (m *ReleaseAdminTokenResponse) Reset()                    { *m = ReleaseAdminTokenResponse{} }
+func (m *ReleaseAdminTokenResponse) String() string            { return proto.CompactTextString(m) }
+func (*ReleaseAdminTokenResponse) ProtoMessage()               {}
+func (*ReleaseAdminTokenResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{38} }
+
+type VerifyAdminTokenRequest struct {
+	Token    int64 `protobuf:"varint,1,opt,name=token" json:"token,omitempty"`
+	LockTime int64 `protobuf:"varint,2,opt,name=lock_time,json=lockTime" json:"lock_time,omitempty"`
+}
+
+func (m *VerifyAdminTokenRequest) Reset()                    { *m = VerifyAdminTokenRequest{} }
+func (m *VerifyAdminTokenRequest) String() string            { return proto.CompactTextString(m) }
+func (*VerifyAdminTokenRequest) ProtoMessage()               {}
+func (*VerifyAdminTokenRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{39} }
+
+func (m *VerifyAdminTokenRequest) GetToken() int64 {
+	if m != nil {
+		return m.Token
+	}
+	return 0
+}
+
+func (m *VerifyAdminTokenRequest) GetLockTime() int64 {
+	if m != nil {
+		return m.LockTime
+	}
+	return 0
+}
+
+type VerifyAdminTokenResponse struct {
+	IsValid bool `protobuf:"varint,1,opt,name=is_valid,json=isValid" json:"is_valid,omitempty"`
+}
+
+func (m *VerifyAdminTokenResponse) Reset()                    { *m = VerifyAdminTokenResponse{} }
+func (m *VerifyAdminTokenResponse) String() string            { return proto.CompactTextString(m) }
+func (*VerifyAdminTokenResponse) ProtoMessage()               {}
+func (*VerifyAdminTokenResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{40} }
+
+func (m *VerifyAdminTokenResponse) GetIsValid() bool {
+	if m != nil {
+		return m.IsValid
+	}
+	return false
+}
+
 func init() {
 	proto.RegisterType((*Heartbeat)(nil), "master_pb.Heartbeat")
 	proto.RegisterType((*HeartbeatResponse)(nil), "master_pb.HeartbeatResponse")
@@ -1516,6 +1654,12 @@ func init() {
 	proto.RegisterType((*GetMasterConfigurationResponse)(nil), "master_pb.GetMasterConfigurationResponse")
 	proto.RegisterType((*ListMasterClientsRequest)(nil), "master_pb.ListMasterClientsRequest")
 	proto.RegisterType((*ListMasterClientsResponse)(nil), "master_pb.ListMasterClientsResponse")
+	proto.RegisterType((*LeaseAdminTokenRequest)(nil), "master_pb.LeaseAdminTokenRequest")
+	proto.RegisterType((*LeaseAdminTokenResponse)(nil), "master_pb.LeaseAdminTokenResponse")
+	proto.RegisterType((*ReleaseAdminTokenRequest)(nil), "master_pb.ReleaseAdminTokenRequest")
+	proto.RegisterType((*ReleaseAdminTokenResponse)(nil), "master_pb.ReleaseAdminTokenResponse")
+	proto.RegisterType((*VerifyAdminTokenRequest)(nil), "master_pb.VerifyAdminTokenRequest")
+	proto.RegisterType((*VerifyAdminTokenResponse)(nil), "master_pb.VerifyAdminTokenResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1540,6 +1684,9 @@ type SeaweedClient interface {
 	LookupEcVolume(ctx context.Context, in *LookupEcVolumeRequest, opts ...grpc.CallOption) (*LookupEcVolumeResponse, error)
 	GetMasterConfiguration(ctx context.Context, in *GetMasterConfigurationRequest, opts ...grpc.CallOption) (*GetMasterConfigurationResponse, error)
 	ListMasterClients(ctx context.Context, in *ListMasterClientsRequest, opts ...grpc.CallOption) (*ListMasterClientsResponse, error)
+	LeaseAdminToken(ctx context.Context, in *LeaseAdminTokenRequest, opts ...grpc.CallOption) (*LeaseAdminTokenResponse, error)
+	ReleaseAdminToken(ctx context.Context, in *ReleaseAdminTokenRequest, opts ...grpc.CallOption) (*ReleaseAdminTokenResponse, error)
+	VerifyAdminToken(ctx context.Context, in *VerifyAdminTokenRequest, opts ...grpc.CallOption) (*VerifyAdminTokenResponse, error)
 }
 
 type seaweedClient struct {
@@ -1693,6 +1840,33 @@ func (c *seaweedClient) ListMasterClients(ctx context.Context, in *ListMasterCli
 	return out, nil
 }
 
+func (c *seaweedClient) LeaseAdminToken(ctx context.Context, in *LeaseAdminTokenRequest, opts ...grpc.CallOption) (*LeaseAdminTokenResponse, error) {
+	out := new(LeaseAdminTokenResponse)
+	err := grpc.Invoke(ctx, "/master_pb.Seaweed/LeaseAdminToken", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *seaweedClient) ReleaseAdminToken(ctx context.Context, in *ReleaseAdminTokenRequest, opts ...grpc.CallOption) (*ReleaseAdminTokenResponse, error) {
+	out := new(ReleaseAdminTokenResponse)
+	err := grpc.Invoke(ctx, "/master_pb.Seaweed/ReleaseAdminToken", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *seaweedClient) VerifyAdminToken(ctx context.Context, in *VerifyAdminTokenRequest, opts ...grpc.CallOption) (*VerifyAdminTokenResponse, error) {
+	out := new(VerifyAdminTokenResponse)
+	err := grpc.Invoke(ctx, "/master_pb.Seaweed/VerifyAdminToken", in, out, c.cc, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // Server API for Seaweed service
 
 type SeaweedServer interface {
@@ -1707,6 +1881,9 @@ type SeaweedServer interface {
 	LookupEcVolume(context.Context, *LookupEcVolumeRequest) (*LookupEcVolumeResponse, error)
 	GetMasterConfiguration(context.Context, *GetMasterConfigurationRequest) (*GetMasterConfigurationResponse, error)
 	ListMasterClients(context.Context, *ListMasterClientsRequest) (*ListMasterClientsResponse, error)
+	LeaseAdminToken(context.Context, *LeaseAdminTokenRequest) (*LeaseAdminTokenResponse, error)
+	ReleaseAdminToken(context.Context, *ReleaseAdminTokenRequest) (*ReleaseAdminTokenResponse, error)
+	VerifyAdminToken(context.Context, *VerifyAdminTokenRequest) (*VerifyAdminTokenResponse, error)
 }
 
 func RegisterSeaweedServer(s *grpc.Server, srv SeaweedServer) {
@@ -1927,6 +2104,60 @@ func _Seaweed_ListMasterClients_Handler(srv interface{}, ctx context.Context, de
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Seaweed_LeaseAdminToken_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(LeaseAdminTokenRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).LeaseAdminToken(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/LeaseAdminToken",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).LeaseAdminToken(ctx, req.(*LeaseAdminTokenRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Seaweed_ReleaseAdminToken_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ReleaseAdminTokenRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).ReleaseAdminToken(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/ReleaseAdminToken",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).ReleaseAdminToken(ctx, req.(*ReleaseAdminTokenRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Seaweed_VerifyAdminToken_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(VerifyAdminTokenRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(SeaweedServer).VerifyAdminToken(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/master_pb.Seaweed/VerifyAdminToken",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(SeaweedServer).VerifyAdminToken(ctx, req.(*VerifyAdminTokenRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 var _Seaweed_serviceDesc = grpc.ServiceDesc{
 	ServiceName: "master_pb.Seaweed",
 	HandlerType: (*SeaweedServer)(nil),
@@ -1967,6 +2198,18 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 			MethodName: "ListMasterClients",
 			Handler:    _Seaweed_ListMasterClients_Handler,
 		},
+		{
+			MethodName: "LeaseAdminToken",
+			Handler:    _Seaweed_LeaseAdminToken_Handler,
+		},
+		{
+			MethodName: "ReleaseAdminToken",
+			Handler:    _Seaweed_ReleaseAdminToken_Handler,
+		},
+		{
+			MethodName: "VerifyAdminToken",
+			Handler:    _Seaweed_VerifyAdminToken_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{
@@ -1988,142 +2231,156 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("master.proto", fileDescriptor0) }
 
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+	0xb3, 0x43, 0xd9, 0xde, 0x29, 0xd3, 0x67, 0x24, 0x43, 0x0d, 0xec, 0x18, 0xfa, 0x0e, 0x09, 0xfe,
+	0x87, 0xbb, 0x7e, 0x0b, 0x56, 0x27, 0x2c, 0xa8, 0x8b, 0xb6, 0x7d, 0xb8, 0xf3, 0x92, 0xa4, 0xf4,
+	0x74, 0x34, 0x6e, 0x4c, 0x6e, 0xbe, 0x65, 0x98, 0x2f, 0x6e, 0x6f, 0x75, 0x49, 0xb5, 0x63, 0xb1,
+	0xd4, 0xcf, 0xa0, 0x3f, 0xae, 0x4d, 0x03, 0xbc, 0x0a, 0x0d, 0xca, 0xdc, 0x0b, 0x1c, 0xd0, 0x0c,
+	0xde, 0x79, 0xca, 0x5e, 0x8a, 0xe1, 0xd6, 0xbf, 0x9b, 0x30, 0x7f, 0x44, 0xf0, 0x6b, 0x42, 0x7c,
+	0xb4, 0x07, 0xed, 0x23, 0x12, 0xf9, 0xc5, 0xaf, 0x9e, 0x65, 0xe3, 0xae, 0xe5, 0xd4, 0xc1, 0xdd,
+	0x49, 0xd4, 0x7c, 0x57, 0xb7, 0x36, 0xac, 0x0f, 0x2c, 0xf4, 0x02, 0xda, 0xa5, 0x67, 0x17, 0xb4,
+	0x66, 0x4c, 0x9a, 0xf4, 0x20, 0x33, 0x58, 0x1d, 0x2b, 0xcc, 0xb2, 0xdb, 0x9d, 0xab, 0x5c, 0x30,
+	0x5f, 0x14, 0xd0, 0xfd, 0xa9, 0x4f, 0x0d, 0x4a, 0xe1, 0xda, 0x35, 0x4f, 0x11, 0xf6, 0x2d, 0xf4,
+	0x19, 0xcc, 0xa9, 0xd6, 0x13, 0xf5, 0x0d, 0xe1, 0x52, 0x0f, 0x5f, 0xb2, 0xab, 0xdc, 0xa7, 0xda,
+	0xb7, 0xd0, 0x33, 0x80, 0xa2, 0x79, 0x43, 0x77, 0x4b, 0x6f, 0x75, 0x95, 0xee, 0x71, 0x70, 0x6f,
+	0x0a, 0x37, 0x57, 0xf6, 0x25, 0x74, 0xca, 0x2d, 0x06, 0x5a, 0x9f, 0xd8, 0x45, 0x18, 0x79, 0x6a,
+	0xf0, 0xe0, 0x0a, 0x89, 0x5c, 0xf1, 0x6f, 0xa0, 0x5b, 0xed, 0x1c, 0x90, 0x3d, 0x71, 0x62, 0xa9,
+	0x0b, 0x19, 0xbc, 0x7d, 0xa5, 0x8c, 0x09, 0x42, 0x91, 0x2a, 0x4b, 0x20, 0x8c, 0xe5, 0xd5, 0x12,
+	0x08, 0xe3, 0xf9, 0x55, 0x81, 0x50, 0xce, 0x2f, 0x25, 0x10, 0x26, 0x66, 0xc3, 0x12, 0x08, 0x93,
+	0x93, 0x93, 0x7d, 0x0b, 0xc5, 0xb0, 0x32, 0x39, 0xea, 0x23, 0xf3, 0xdd, 0xf2, 0xca, 0xd4, 0x31,
+	0x78, 0xf8, 0x3d, 0x24, 0xf3, 0x05, 0xbf, 0x86, 0xde, 0x58, 0x90, 0x46, 0x26, 0xa4, 0xd3, 0xe2,
+	0xff, 0xe0, 0x9d, 0xab, 0x85, 0xf2, 0x15, 0xbe, 0x82, 0xc5, 0x4a, 0x48, 0x45, 0x25, 0x28, 0x26,
+	0x06, 0xba, 0x81, 0x7d, 0x95, 0x88, 0x69, 0xfd, 0x58, 0xe4, 0x2a, 0x59, 0x3f, 0x2d, 0x90, 0x96,
+	0xac, 0x9f, 0x1e, 0xfc, 0xe4, 0xa9, 0xac, 0x06, 0xac, 0xd2, 0xa9, 0x9c, 0x12, 0x1b, 0x4b, 0xa7,
+	0x72, 0x5a, 0xc4, 0xb3, 0x6f, 0x9d, 0xcc, 0xc9, 0xdf, 0xd8, 0x1f, 0xfe, 0x37, 0x00, 0x00, 0xff,
+	0xff, 0x41, 0x4f, 0x53, 0xa0, 0xd6, 0x1e, 0x00, 0x00,
 }

weed/server/master_grpc_server_admin.go

@@ -0,0 +1,107 @@
+package weed_server
+
+import (
+	"context"
+	"math/rand"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+)
+
+/*
+How exclusive lock works?
+-----------
+
+Shell
+------
+When shell lock,
+  * lease an admin token (lockTime, token)
+  * start a goroutine to renew the admin token periodically
+For later volume operations, send (lockTime, token) to volume servers for exclusive access
+  * need to pause renewal a few seconds, to prevent race condition
+
+When shell unlock
+  * stop the renewal goroutine
+  * sends a release lock request
+
+Master
+------
+Master maintains:
+  * randomNumber
+  * lastLockTime
+When master receives the lease/renew request from shell
+  If lastLockTime still fresh {
+    if is a renew and token is valid {
+      // for renew
+      generate the randomNumber => token
+      return
+    }
+    refuse
+    return
+  } else {
+    // for fresh lease request
+    generate the randomNumber => token
+    return
+  }
+
+When master receives the release lock request from shell
+  set the lastLockTime to zero
+
+When master receives the verfication request from volume servers
+  return secret+lockTime == token && lockTime == lastLockTime
+
+Volume
+------
+When receives (lockTime, token), ask the master whether this is valid
+
+
+*/
+
+const (
+	LockDuration = 10 * time.Second
+)
+
+func (ms *MasterServer) LeaseAdminToken(ctx context.Context, req *master_pb.LeaseAdminTokenRequest) (*master_pb.LeaseAdminTokenResponse, error) {
+	resp := &master_pb.LeaseAdminTokenResponse{}
+
+	if ms.adminAccessLockTime.Add(LockDuration).After(time.Now()) {
+		if req.PreviousToken != 0 && ms.isValidToken(time.Unix(0, req.PreviousLockTime), req.PreviousToken) {
+			// for renew
+			ts, token := ms.generateToken()
+			resp.Token, resp.LockTsNs = token, ts.UnixNano()
+			return resp, nil
+		}
+		// refuse since still locked
+		resp.Error = "already locked"
+		return resp, nil
+	}
+	// for fresh lease request
+	ts, token := ms.generateToken()
+	resp.Token, resp.LockTsNs = token, ts.UnixNano()
+	return resp, nil
+}
+
+func (ms *MasterServer) isValidToken(ts time.Time, token int64) bool {
+	return ms.adminAccessLockTime.Equal(ts) && ms.adminAccessSecret == token
+}
+func (ms *MasterServer) generateToken() (ts time.Time, token int64) {
+	ms.adminAccessLockTime = time.Now()
+	ms.adminAccessSecret = rand.Int63()
+	return ms.adminAccessLockTime, ms.adminAccessSecret
+}
+
+func (ms *MasterServer) ReleaseAdminToken(ctx context.Context, req *master_pb.ReleaseAdminTokenRequest) (*master_pb.ReleaseAdminTokenResponse, error) {
+	resp := &master_pb.ReleaseAdminTokenResponse{}
+	if ms.isValidToken(time.Unix(0, req.PreviousLockTime), req.PreviousToken) {
+		ms.adminAccessSecret = 0
+	}
+	return resp, nil
+}
+
+func (ms *MasterServer) VerifyAdminToken(ctx context.Context, req *master_pb.VerifyAdminTokenRequest) (*master_pb.VerifyAdminTokenResponse, error) {
+	resp := &master_pb.VerifyAdminTokenResponse{}
+	if ms.isValidToken(time.Unix(0, req.LockTime), req.Token) {
+		resp.IsValid = true
+	}
+	return resp, nil
+}

weed/server/master_server.go

@@ -66,7 +66,8 @@ type MasterServer struct {
 
 	MasterClient *wdclient.MasterClient
 
-	currentAdminShellClient string
+	adminAccessSecret   int64
+	adminAccessLockTime time.Time
 }
 
 func NewMasterServer(r *mux.Router, option *MasterOption, peers []string) *MasterServer {