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package cluster
import (
"context"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/cluster/lock_manager"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"github.com/seaweedfs/seaweedfs/weed/util"
"google.golang.org/grpc"
"time"
)
type LockClient struct {
grpcDialOption grpc.DialOption
maxLockDuration time.Duration
sleepDuration time.Duration
}
func NewLockClient(grpcDialOption grpc.DialOption) *LockClient {
return &LockClient{
grpcDialOption: grpcDialOption,
maxLockDuration: 5 * time.Second,
sleepDuration: 4 * time.Millisecond,
}
}
type LiveLock struct {
key string
renewToken string
expireAtNs int64
filer pb.ServerAddress
cancelCh chan struct{}
grpcDialOption grpc.DialOption
isLocked bool
}
// NewLockWithTimeout locks the key with the given duration
func (lc *LockClient) NewLockWithTimeout(filer pb.ServerAddress, key string, lockDuration time.Duration) (lock *LiveLock) {
return lc.doNewLock(filer, key, lockDuration)
}
// NewLock creates a lock with a very long duration
func (lc *LockClient) NewLock(filer pb.ServerAddress, key string) (lock *LiveLock) {
return lc.doNewLock(filer, key, lock_manager.MaxDuration)
}
func (lc *LockClient) doNewLock(filer pb.ServerAddress, key string, lockDuration time.Duration) (lock *LiveLock) {
lock = &LiveLock{
key: key,
filer: filer,
cancelCh: make(chan struct{}),
expireAtNs: time.Now().Add(lockDuration).UnixNano(),
grpcDialOption: lc.grpcDialOption,
}
var needRenewal bool
if lockDuration > lc.maxLockDuration {
lockDuration = lc.maxLockDuration
needRenewal = true
}
util.RetryForever("create lock:"+key, func() error {
errorMessage, err := lock.doLock(lockDuration)
if err != nil {
return err
}
if errorMessage != "" {
return fmt.Errorf("%v", errorMessage)
}
return nil
}, func(err error) (shouldContinue bool) {
if err != nil {
glog.Warningf("create lock %s: %s", key, err)
}
return lock.renewToken == ""
})
lock.isLocked = true
if needRenewal {
go lc.keepLock(lock)
}
return
}
func (lock *LiveLock) IsLocked() bool {
return lock.isLocked
}
func (lock *LiveLock) Unlock() error {
close(lock.cancelCh)
return pb.WithFilerClient(false, 0, lock.filer, lock.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
_, err := client.Unlock(context.Background(), &filer_pb.UnlockRequest{
Name: lock.key,
RenewToken: lock.renewToken,
})
return err
})
}
func (lc *LockClient) keepLock(lock *LiveLock) {
for {
select {
case <-time.After(lc.sleepDuration):
// renew the lock if lock.expireAtNs is still greater than now
util.RetryForever("keep lock:"+lock.key, func() error {
lockDuration := time.Duration(lock.expireAtNs-time.Now().UnixNano()) * time.Nanosecond
if lockDuration > lc.maxLockDuration {
lockDuration = lc.maxLockDuration
}
if lockDuration <= 0 {
return nil
}
errorMessage, err := lock.doLock(lockDuration)
if err != nil {
lock.isLocked = false
return err
}
if errorMessage != "" {
lock.isLocked = false
return fmt.Errorf("%v", errorMessage)
}
return nil
}, func(err error) (shouldContinue bool) {
if err == nil {
return false
}
glog.Warningf("keep lock %s: %v", lock.key, err)
return true
})
if !lock.isLocked {
return
}
case <-lock.cancelCh:
return
}
}
}
func (lock *LiveLock) doLock(lockDuration time.Duration) (errorMessage string, err error) {
err = pb.WithFilerClient(false, 0, lock.filer, lock.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
resp, err := client.Lock(context.Background(), &filer_pb.LockRequest{
Name: lock.key,
SecondsToLock: int64(lockDuration.Seconds()),
RenewToken: lock.renewToken,
IsMoved: false,
})
if err == nil {
lock.renewToken = resp.RenewToken
}
if resp != nil {
errorMessage = resp.Error
if resp.MovedTo != "" {
lock.filer = pb.ServerAddress(resp.MovedTo)
}
}
return err
})
return
}
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