2020-05-26 07:03:31 +00:00
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package exclusive_locks
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2020-04-23 09:31:04 +00:00
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import (
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"context"
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"sync/atomic"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/master_pb"
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"github.com/chrislusf/seaweedfs/weed/wdclient"
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)
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const (
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RenewInteval = 4 * time.Second
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SafeRenewInteval = 3 * time.Second
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2020-04-23 10:32:18 +00:00
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InitLockInteval = 1 * time.Second
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2020-05-26 01:39:53 +00:00
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AdminLockName = "admin"
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2020-04-23 09:31:04 +00:00
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)
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type ExclusiveLocker struct {
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masterClient *wdclient.MasterClient
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token int64
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lockTsNs int64
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isLocking bool
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}
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func NewExclusiveLocker(masterClient *wdclient.MasterClient) *ExclusiveLocker {
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return &ExclusiveLocker{
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masterClient: masterClient,
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}
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}
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2020-05-26 07:03:31 +00:00
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func (l *ExclusiveLocker) IsLocking() bool {
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return l.isLocking
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}
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2020-04-23 09:31:04 +00:00
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func (l *ExclusiveLocker) GetToken() (token int64, lockTsNs int64) {
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for time.Unix(0, atomic.LoadInt64(&l.lockTsNs)).Add(SafeRenewInteval).Before(time.Now()) {
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// wait until now is within the safe lock period, no immediate renewal to change the token
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time.Sleep(100 * time.Millisecond)
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}
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return atomic.LoadInt64(&l.token), atomic.LoadInt64(&l.lockTsNs)
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}
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2020-04-23 10:11:07 +00:00
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func (l *ExclusiveLocker) RequestLock() {
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2020-06-05 22:27:10 +00:00
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if l.isLocking {
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2020-05-26 07:03:31 +00:00
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return
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}
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2020-09-09 19:07:15 +00:00
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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2020-04-23 09:31:04 +00:00
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// retry to get the lease
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for {
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if err := l.masterClient.WithClient(func(client master_pb.SeaweedClient) error {
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2020-09-09 19:07:15 +00:00
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resp, err := client.LeaseAdminToken(ctx, &master_pb.LeaseAdminTokenRequest{
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2020-04-23 10:35:52 +00:00
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PreviousToken: atomic.LoadInt64(&l.token),
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PreviousLockTime: atomic.LoadInt64(&l.lockTsNs),
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2020-05-26 01:39:53 +00:00
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LockName: AdminLockName,
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2020-04-23 10:35:52 +00:00
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})
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2020-04-23 09:31:04 +00:00
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if err == nil {
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atomic.StoreInt64(&l.token, resp.Token)
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atomic.StoreInt64(&l.lockTsNs, resp.LockTsNs)
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}
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return err
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}); err != nil {
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2020-04-23 10:32:18 +00:00
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// println("leasing problem", err.Error())
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time.Sleep(InitLockInteval)
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2020-04-23 09:31:04 +00:00
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} else {
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break
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}
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}
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l.isLocking = true
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// start a goroutine to renew the lease
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go func() {
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for l.isLocking {
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if err := l.masterClient.WithClient(func(client master_pb.SeaweedClient) error {
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2020-09-09 19:07:15 +00:00
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resp, err := client.LeaseAdminToken(ctx, &master_pb.LeaseAdminTokenRequest{
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2020-04-23 09:31:04 +00:00
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PreviousToken: atomic.LoadInt64(&l.token),
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PreviousLockTime: atomic.LoadInt64(&l.lockTsNs),
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2020-05-26 01:39:53 +00:00
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LockName: AdminLockName,
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2020-04-23 09:31:04 +00:00
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})
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if err == nil {
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atomic.StoreInt64(&l.token, resp.Token)
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atomic.StoreInt64(&l.lockTsNs, resp.LockTsNs)
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2020-04-23 10:11:07 +00:00
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// println("ts", l.lockTsNs, "token", l.token)
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2020-04-23 09:31:04 +00:00
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}
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return err
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}); err != nil {
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2020-04-23 10:43:45 +00:00
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glog.Errorf("failed to renew lock: %v", err)
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2020-04-23 09:31:04 +00:00
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return
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} else {
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time.Sleep(RenewInteval)
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}
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}
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}()
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}
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2020-04-23 10:11:07 +00:00
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func (l *ExclusiveLocker) ReleaseLock() {
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2020-04-23 09:31:04 +00:00
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l.isLocking = false
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2020-09-09 19:07:15 +00:00
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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2020-04-23 09:31:04 +00:00
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l.masterClient.WithClient(func(client master_pb.SeaweedClient) error {
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2020-09-09 19:07:15 +00:00
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client.ReleaseAdminToken(ctx, &master_pb.ReleaseAdminTokenRequest{
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2020-04-23 09:31:04 +00:00
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PreviousToken: atomic.LoadInt64(&l.token),
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PreviousLockTime: atomic.LoadInt64(&l.lockTsNs),
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2020-05-26 01:39:53 +00:00
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LockName: AdminLockName,
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2020-04-23 09:31:04 +00:00
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})
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return nil
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})
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2020-04-23 10:32:18 +00:00
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atomic.StoreInt64(&l.token, 0)
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atomic.StoreInt64(&l.lockTsNs, 0)
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2020-04-23 09:31:04 +00:00
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}
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