add exclusive lock library on shell

5 files changed, 257 insertions, 179 deletions

diff --git a/weed/pb/master.proto b/weed/pb/master.proto
index 3e9e3ba41..29fd9d0e2 100644
--- a/weed/pb/master.proto
+++ b/weed/pb/master.proto
@@ -287,10 +287,8 @@ message LeaseAdminTokenRequest {
     int64 previous_lock_time = 2;
 }
 message LeaseAdminTokenResponse {
-    bool is_allowed = 1;
-    string error = 2;
-    int64 lock_ts_ns = 3;
-    int64 token = 4;
+    int64 token = 1;
+    int64 lock_ts_ns = 2;
 }
 
 message ReleaseAdminTokenRequest {
diff --git a/weed/pb/master_pb/master.pb.go b/weed/pb/master_pb/master.pb.go
index b3fcf531a..727cce157 100644
--- a/weed/pb/master_pb/master.pb.go
+++ b/weed/pb/master_pb/master.pb.go
@@ -1504,10 +1504,8 @@ func (m *LeaseAdminTokenRequest) GetPreviousLockTime() int64 {
 }
 
 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"`
+	Token    int64 `protobuf:"varint,1,opt,name=token" json:"token,omitempty"`
+	LockTsNs int64 `protobuf:"varint,2,opt,name=lock_ts_ns,json=lockTsNs" json:"lock_ts_ns,omitempty"`
 }
 
 func (m *LeaseAdminTokenResponse) Reset()                    { *m = LeaseAdminTokenResponse{} }
@@ -1515,18 +1513,11 @@ func (m *LeaseAdminTokenResponse) String() string            { return proto.Comp
 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 {
+func (m *LeaseAdminTokenResponse) GetToken() int64 {
 	if m != nil {
-		return m.Error
+		return m.Token
 	}
-	return ""
+	return 0
 }
 
 func (m *LeaseAdminTokenResponse) GetLockTsNs() int64 {
@@ -1536,13 +1527,6 @@ func (m *LeaseAdminTokenResponse) GetLockTsNs() int64 {
 	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"`
@@ -2231,156 +2215,154 @@ var _Seaweed_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("master.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
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+	// 2380 bytes of a gzipped FileDescriptorProto
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+	0x29, 0xe3, 0xd4, 0x65, 0xa9, 0x3b, 0x4b, 0x8e, 0xab, 0x5c, 0xe7, 0xb8, 0xea, 0x2c, 0xc7, 0xd5,
+	0x32, 0xc7, 0x59, 0xff, 0xae, 0x00, 0x32, 0x57, 0xd2, 0x10, 0xfc, 0x08, 0x4b, 0x09, 0xc8, 0x78,
+	0xc4, 0x45, 0xa9, 0x28, 0xca, 0x31, 0x5d, 0x54, 0x49, 0x8a, 0x70, 0x9f, 0x38, 0x0d, 0x23, 0x46,
+	0x3c, 0xc5, 0x55, 0x15, 0x55, 0x5d, 0x10, 0x24, 0xb3, 0x58, 0x90, 0x2d, 0x94, 0x0a, 0x32, 0x6b,
+	0x07, 0x9a, 0x3a, 0x39, 0x9d, 0x88, 0xc4, 0x76, 0xbd, 0xf5, 0xda, 0xba, 0x6a, 0x0e, 0xc4, 0x06,
+	0xc0, 0x6e, 0x6e, 0xfd, 0x94, 0xf0, 0x6c, 0xfd, 0x01, 0x6e, 0xe7, 0x12, 0x07, 0x94, 0xf1, 0xd4,
+	0x2f, 0x1f, 0xc1, 0x2a, 0x0d, 0x5d, 0x7f, 0xe4, 0x11, 0x27, 0x14, 0xe9, 0xdd, 0xcf, 0x3a, 0x9b,
+	0x8a, 0x2c, 0xe5, 0x56, 0x34, 0xf7, 0x48, 0x32, 0xd3, 0x0e, 0xe7, 0x7d, 0x40, 0xe9, 0x2c, 0xe2,
+	0x66, 0x33, 0xaa, 0x72, 0x46, 0x57, 0x73, 0xf6, 0x5c, 0x2d, 0x6d, 0xbd, 0x80, 0xd5, 0xf2, 0xe2,
+	0xda, 0x55, 0xbf, 0x84, 0x66, 0x0e, 0x7b, 0x1a, 0x07, 0x6f, 0x1b, 0xe1, 0x27, 0x9f, 0x67, 0x9b,
+	0x92, 0xd6, 0x4f, 0xe1, 0x4e, 0xce, 0x7a, 0x22, 0x03, 0xfd, 0x15, 0xd9, 0xc9, 0x1a, 0x40, 0x7f,
+	0x52, 0x5c, 0xd9, 0x60, 0xfd, 0xa5, 0x06, 0x4b, 0x4f, 0xf4, 0xcd, 0x15, 0x35, 0x8e, 0x51, 0xd5,
+	0xa8, 0xd2, 0xe2, 0x01, 0x2c, 0x15, 0x2e, 0xa4, 0x2a, 0xc6, 0x9b, 0x17, 0x46, 0xab, 0x3d, 0xad,
+	0x29, 0xaf, 0x49, 0xb1, 0x72, 0x53, 0xfe, 0x08, 0x7a, 0xa7, 0x09, 0x21, 0x93, 0xfd, 0xfb, 0x9c,
+	0xdd, 0x11, 0x0c, 0x53, 0x76, 0x0b, 0x96, 0xb1, 0xcb, 0xe9, 0x45, 0x49, 0x5a, 0x9d, 0xaf, 0x9e,
+	0x62, 0x99, 0xf2, 0x9f, 0x67, 0x86, 0xd2, 0xf0, 0x34, 0x62, 0xfd, 0x85, 0xef, 0xdf, 0x7f, 0xeb,
+	0xdd, 0x08, 0x0e, 0x43, 0xcf, 0xa1, 0x9d, 0xf6, 0x71, 0x5a, 0xd3, 0xe2, 0x8d, 0x7b, 0xc4, 0x25,
+	0x92, 0xb3, 0x98, 0x51, 0x54, 0x17, 0x76, 0x52, 0x57, 0x3b, 0x51, 0x2c, 0x33, 0xb0, 0xfd, 0xab,
+	0x0a, 0x75, 0x1b, 0xbb, 0xe7, 0x6f, 0xb6, 0x3f, 0x3e, 0x83, 0x4e, 0x96, 0x23, 0x0a, 0x2e, 0xb9,
+	0x63, 0x00, 0x69, 0x1e, 0x3d, 0xbb, 0xe5, 0x19, 0xa3, 0x99, 0xb0, 0x2d, 0xce, 0x82, 0xed, 0x1f,
+	0x55, 0x68, 0x3f, 0xc9, 0xf2, 0xd6, 0x9b, 0x0d, 0xde, 0x36, 0x80, 0x48, 0xb4, 0x05, 0xdc, 0xcc,
+	0xc2, 0x24, 0x3d, 0x1e, 0x76, 0x23, 0xd1, 0x5f, 0x37, 0xc7, 0xeb, 0xdb, 0x2a, 0x2c, 0x9d, 0x44,
+	0x71, 0xe4, 0x47, 0x67, 0xe3, 0x37, 0x1b, 0xad, 0x3d, 0xe8, 0x19, 0x35, 0x4c, 0x01, 0xb4, 0xb5,
+	0xd2, 0x61, 0xcb, 0x0f, 0x87, 0xdd, 0xf1, 0x0a, 0xe3, 0x9b, 0x03, 0xb8, 0x0c, 0x3d, 0x5d, 0xd7,
+	0xe7, 0x29, 0xc5, 0xfa, 0x53, 0x05, 0x90, 0x49, 0xd5, 0xb1, 0xfe, 0xd7, 0xd0, 0xe2, 0x1a, 0x6b,
+	0x69, 0x9f, 0xee, 0x7c, 0xcc, 0xbb, 0x60, 0xfa, 0xc2, 0x5e, 0xe2, 0xa6, 0x67, 0x7e, 0x06, 0x2b,
+	0x13, 0x6f, 0x44, 0xa2, 0xa0, 0x52, 0x1e, 0xe9, 0x95, 0x9e, 0x89, 0x0e, 0x87, 0xd6, 0x47, 0x70,
+	0x5b, 0x15, 0xd1, 0x69, 0x1e, 0x4a, 0xf3, 0xc3, 0x44, 0x35, 0xdc, 0xca, 0xab, 0x61, 0xeb, 0xbb,
+	0x0a, 0xac, 0x96, 0xa7, 0x69, 0xfb, 0xaf, 0x9a, 0x87, 0x30, 0x20, 0x1d, 0x2f, 0xcd, 0xba, 0x5e,
+	0x95, 0xd3, 0x1f, 0x4e, 0xd4, 0xf5, 0x65, 0xdd, 0x5b, 0x69, 0x1c, 0xcd, 0x4b, 0xfb, 0x2e, 0x2b,
+	0x12, 0xd8, 0x00, 0x43, 0x6f, 0x42, 0x4c, 0x74, 0x45, 0xe9, 0xba, 0xda, 0xa6, 0x45, 0x3d, 0xf1,
+	0x07, 0x14, 0xf6, 0xd6, 0x3a, 0xdc, 0x7b, 0x4a, 0xf8, 0xa1, 0x94, 0xd9, 0x8d, 0xc2, 0x53, 0x7a,
+	0x36, 0x4a, 0x94, 0x50, 0xee, 0xda, 0xfb, 0xb3, 0x24, 0x34, 0x4c, 0x53, 0x1e, 0xe2, 0x2a, 0x37,
+	0x7e, 0x88, 0xab, 0x5e, 0xf5, 0x10, 0x67, 0x7d, 0x02, 0x7d, 0x71, 0xb2, 0xb4, 0x15, 0x3e, 0x25,
+	0x21, 0xcf, 0xea, 0xcc, 0x75, 0x68, 0xba, 0x92, 0xe2, 0x18, 0x4f, 0x06, 0xa0, 0x48, 0xa2, 0xbe,
+	0xb2, 0x1e, 0xc3, 0xda, 0x94, 0xc9, 0xda, 0xf8, 0x77, 0xa1, 0x2d, 0xbb, 0x58, 0x6d, 0x39, 0x49,
+	0x7b, 0xbf, 0x96, 0xa0, 0xee, 0xa4, 0x44, 0x2b, 0x80, 0xd5, 0x03, 0x82, 0x19, 0xd9, 0xf1, 0x02,
+	0x1a, 0x9e, 0x44, 0xe7, 0x24, 0xeb, 0x5a, 0xde, 0x85, 0x76, 0x9c, 0x90, 0x0b, 0x1a, 0x8d, 0x98,
+	0xc3, 0x05, 0x43, 0x5a, 0x50, 0xb3, 0x5b, 0x29, 0x55, 0x4a, 0x8b, 0xfa, 0x29, 0x13, 0x13, 0x8d,
+	0xbe, 0xc3, 0x69, 0xa0, 0x9e, 0x12, 0x6a, 0x76, 0x37, 0xe5, 0x1c, 0x44, 0xee, 0xf9, 0x09, 0x0d,
+	0x88, 0x75, 0x08, 0x77, 0x26, 0x96, 0xd3, 0x06, 0xaf, 0xc0, 0xbc, 0xb9, 0x8c, 0x1a, 0xa0, 0xb7,
+	0x00, 0x94, 0x56, 0xe6, 0x84, 0x4c, 0xab, 0xad, 0x0b, 0xca, 0x09, 0x3b, 0x62, 0x56, 0x04, 0x7d,
+	0x9b, 0xf8, 0xff, 0x47, 0xfb, 0xef, 0xc2, 0xda, 0x94, 0x05, 0x75, 0xf9, 0x75, 0x00, 0x77, 0x5e,
+	0x92, 0x84, 0x9e, 0x8e, 0x27, 0x8d, 0x99, 0xbe, 0xb9, 0xbb, 0xf2, 0x5c, 0x17, 0x96, 0x54, 0x7b,
+	0x13, 0x4b, 0xfd, 0x02, 0xfa, 0x93, 0xda, 0x34, 0x56, 0x6b, 0x50, 0xa7, 0xcc, 0xb9, 0xc0, 0xbe,
+	0xbe, 0x2b, 0x75, 0x7b, 0x91, 0xb2, 0x97, 0x62, 0xb8, 0xfd, 0x9f, 0x06, 0x2c, 0x1e, 0x13, 0xfc,
+	0x9a, 0x10, 0x0f, 0xed, 0x43, 0xeb, 0x98, 0x84, 0x5e, 0xfe, 0xd3, 0x66, 0xc5, 0xb8, 0x35, 0x19,
+	0x75, 0xf0, 0xd6, 0x34, 0x6a, 0xb6, 0xab, 0x5b, 0x9b, 0x95, 0x0f, 0x2a, 0xe8, 0x05, 0xb4, 0x0a,
+	0x0f, 0x28, 0x68, 0xdd, 0x98, 0x34, 0xed, 0x69, 0x65, 0xb0, 0x36, 0x51, 0x62, 0xa5, 0xf7, 0x34,
+	0x53, 0xb9, 0x64, 0xbe, 0x0d, 0xa0, 0xfb, 0x33, 0x1f, 0x0d, 0x94, 0xc2, 0xf5, 0x6b, 0x1e, 0x15,
+	0xac, 0x5b, 0xe8, 0x33, 0x58, 0x50, 0x4d, 0x24, 0xea, 0x1b, 0xc2, 0x85, 0x6e, 0xbc, 0x60, 0x57,
+	0xb1, 0xe3, 0xb4, 0x6e, 0xa1, 0x67, 0x00, 0x79, 0x1b, 0x86, 0xde, 0x2a, 0xbc, 0xba, 0x95, 0xfa,
+	0xc0, 0xc1, 0xbd, 0x19, 0xdc, 0x4c, 0xd9, 0x97, 0xd0, 0x2e, 0x36, 0x0b, 0x68, 0x63, 0x6a, 0x3f,
+	0x60, 0x64, 0x9c, 0xc1, 0x83, 0x2b, 0x24, 0x32, 0xc5, 0xbf, 0x83, 0x6e, 0xb9, 0x07, 0x40, 0xd6,
+	0xd4, 0x89, 0x85, 0x7e, 0x62, 0xf0, 0xf6, 0x95, 0x32, 0x26, 0x08, 0x79, 0xd2, 0x2b, 0x80, 0x30,
+	0x91, 0x21, 0x0b, 0x20, 0x4c, 0x66, 0x4a, 0x05, 0x42, 0x31, 0x53, 0x14, 0x40, 0x98, 0x9a, 0xd7,
+	0x0a, 0x20, 0x4c, 0x4f, 0x33, 0xd6, 0x2d, 0x14, 0xc1, 0xea, 0xf4, 0xf8, 0x8d, 0xcc, 0x17, 0xc8,
+	0x2b, 0x93, 0xc0, 0xe0, 0xe1, 0xf7, 0x90, 0xcc, 0x16, 0xfc, 0x1a, 0x7a, 0x13, 0xe1, 0x16, 0x99,
+	0x90, 0xce, 0x8a, 0xe4, 0x83, 0x77, 0xae, 0x16, 0xca, 0x56, 0xf8, 0x0a, 0x3a, 0xa5, 0xe8, 0x88,
+	0x0a, 0x50, 0x4c, 0x0d, 0x74, 0x03, 0xeb, 0x2a, 0x11, 0xd3, 0xfa, 0x89, 0xc8, 0x55, 0xb0, 0x7e,
+	0x56, 0x20, 0x2d, 0x58, 0x3f, 0x3b, 0xf8, 0xc9, 0x53, 0x59, 0x0e, 0x58, 0x85, 0x53, 0x39, 0x23,
+	0x36, 0x16, 0x4e, 0xe5, 0xac, 0x88, 0x67, 0xdd, 0x1a, 0x2e, 0xc8, 0x1f, 0xd2, 0x1f, 0xfe, 0x2f,
+	0x00, 0x00, 0xff, 0xff, 0x9d, 0x02, 0x6b, 0x59, 0xa0, 0x1e, 0x00, 0x00,
 }
diff --git a/weed/server/master_grpc_server_admin.go b/weed/server/master_grpc_server_admin.go
index b74e9291d..260681e40 100644
--- a/weed/server/master_grpc_server_admin.go
+++ b/weed/server/master_grpc_server_admin.go
@@ -2,6 +2,7 @@ package weed_server
 
 import (
 	"context"
+	"fmt"
 	"math/rand"
 	"time"
 
@@ -72,8 +73,7 @@ func (ms *MasterServer) LeaseAdminToken(ctx context.Context, req *master_pb.Leas
 			return resp, nil
 		}
 		// refuse since still locked
-		resp.Error = "already locked"
-		return resp, nil
+		return resp, fmt.Errorf("already locked")
 	}
 	// for fresh lease request
 	ts, token := ms.generateToken()
diff --git a/weed/shell/commands.go b/weed/shell/commands.go
index 96343971a..2faba4280 100644
--- a/weed/shell/commands.go
+++ b/weed/shell/commands.go
@@ -28,6 +28,7 @@ type CommandEnv struct {
 	env          map[string]string
 	MasterClient *wdclient.MasterClient
 	option       ShellOptions
+	locker       *ExclusiveLocker
 }
 
 type command interface {
@@ -41,11 +42,13 @@ var (
 )
 
 func NewCommandEnv(options ShellOptions) *CommandEnv {
-	return &CommandEnv{
+	ce := &CommandEnv{
 		env:          make(map[string]string),
 		MasterClient: wdclient.NewMasterClient(options.GrpcDialOption, pb.AdminShellClient, "", 0, strings.Split(*options.Masters, ",")),
 		option:       options,
 	}
+	ce.locker = NewExclusiveLocker(ce.MasterClient)
+	return ce
 }
 
 func (ce *CommandEnv) parseUrl(input string) (path string, err error) {
diff --git a/weed/shell/exclusive_locker.go b/weed/shell/exclusive_locker.go
new file mode 100644
index 000000000..9485b255c
--- /dev/null
+++ b/weed/shell/exclusive_locker.go
@@ -0,0 +1,95 @@
+package shell
+
+import (
+	"context"
+	"sync/atomic"
+	"time"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
+	"github.com/chrislusf/seaweedfs/weed/wdclient"
+)
+
+const (
+	RenewInteval     = 4 * time.Second
+	SafeRenewInteval = 3 * time.Second
+)
+
+type ExclusiveLocker struct {
+	masterClient *wdclient.MasterClient
+	token        int64
+	lockTsNs     int64
+	isLocking    bool
+}
+
+func NewExclusiveLocker(masterClient *wdclient.MasterClient) *ExclusiveLocker {
+	return &ExclusiveLocker{
+		masterClient: masterClient,
+	}
+}
+
+func (l *ExclusiveLocker) GetToken() (token int64, lockTsNs int64) {
+	for time.Unix(0, atomic.LoadInt64(&l.lockTsNs)).Add(SafeRenewInteval).Before(time.Now()) {
+		// wait until now is within the safe lock period, no immediate renewal to change the token
+		time.Sleep(100 * time.Millisecond)
+	}
+	return atomic.LoadInt64(&l.token), atomic.LoadInt64(&l.lockTsNs)
+}
+
+func (l *ExclusiveLocker) Lock() {
+	// retry to get the lease
+	for {
+		if err := l.masterClient.WithClient(func(client master_pb.SeaweedClient) error {
+			resp, err := client.LeaseAdminToken(context.Background(), &master_pb.LeaseAdminTokenRequest{
+				PreviousToken:    atomic.LoadInt64(&l.token),
+				PreviousLockTime: atomic.LoadInt64(&l.lockTsNs),
+			})
+			if err == nil {
+				atomic.StoreInt64(&l.token, resp.Token)
+				atomic.StoreInt64(&l.lockTsNs, resp.LockTsNs)
+			}
+			return err
+		}); err != nil {
+			time.Sleep(RenewInteval)
+		} else {
+			break
+		}
+	}
+
+	l.isLocking = true
+
+	// start a goroutine to renew the lease
+	go func() {
+		for l.isLocking {
+			if err := l.masterClient.WithClient(func(client master_pb.SeaweedClient) error {
+				resp, err := client.LeaseAdminToken(context.Background(), &master_pb.LeaseAdminTokenRequest{
+					PreviousToken:    atomic.LoadInt64(&l.token),
+					PreviousLockTime: atomic.LoadInt64(&l.lockTsNs),
+				})
+				if err == nil {
+					atomic.StoreInt64(&l.token, resp.Token)
+					atomic.StoreInt64(&l.lockTsNs, resp.LockTsNs)
+				}
+				return err
+			}); err != nil {
+				glog.Error("failed to renew lock: %v", err)
+				return
+			} else {
+				time.Sleep(RenewInteval)
+			}
+
+		}
+	}()
+
+}
+
+func (l *ExclusiveLocker) Unlock() {
+	l.isLocking = false
+	l.masterClient.WithClient(func(client master_pb.SeaweedClient) error {
+		client.ReleaseAdminToken(context.Background(), &master_pb.ReleaseAdminTokenRequest{
+			PreviousToken:    atomic.LoadInt64(&l.token),
+			PreviousLockTime: atomic.LoadInt64(&l.lockTsNs),
+		})
+		return nil
+	})
+}