91 lines
1.9 KiB
Go
91 lines
1.9 KiB
Go
package etcd
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import (
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"context"
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"errors"
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"fmt"
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"strings"
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"time"
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"github.com/RichardKnop/machinery/v2/locks/iface"
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"github.com/RichardKnop/machinery/v2/log"
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clientv3 "go.etcd.io/etcd/client/v3"
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"go.etcd.io/etcd/client/v3/concurrency"
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)
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var (
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// ErrLockFailed ..
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ErrLockFailed = errors.New("etcd lock: failed to acquire lock")
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)
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type etcdLock struct {
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cli *clientv3.Client
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retries int
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}
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// New ..
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func New(ctx context.Context, endpoint string, retries int) (iface.Lock, error) {
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etcdConf := clientv3.Config{
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Endpoints: []string{endpoint},
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Context: ctx,
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DialTimeout: time.Second * 5,
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}
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cli, err := clientv3.New(etcdConf)
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if err != nil {
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return nil, err
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}
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lock := etcdLock{
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cli: cli,
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retries: retries,
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}
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return &lock, nil
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}
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// LockWithRetries ..
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func (r etcdLock) LockWithRetries(key string, unixTsToExpireNs int64) error {
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i := 0
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for ; i < r.retries; i++ {
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err := r.Lock(key, unixTsToExpireNs)
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if err == nil {
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// 成功拿到锁，返回
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return nil
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}
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log.DEBUG.Printf("acquired lock=%s failed, retries=%d, err=%s", key, i, err)
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time.Sleep(time.Millisecond * 100)
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}
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log.INFO.Printf("acquired lock=%s failed, retries=%d", key, i)
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return ErrLockFailed
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}
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// Lock ..
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func (r etcdLock) Lock(key string, unixTsToExpireNs int64) error {
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now := time.Now().UnixNano()
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ttl := time.Duration(unixTsToExpireNs + 1 - now)
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// 创建一个新的session
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s, err := concurrency.NewSession(r.cli, concurrency.WithTTL(int(ttl.Seconds())))
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if err != nil {
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return err
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}
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defer s.Orphan()
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lockKey := fmt.Sprintf("/machinery/v2/lock/%s", strings.TrimRight(key, "/"))
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m := concurrency.NewMutex(s, lockKey)
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ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
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defer cancel()
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if err := m.Lock(ctx); err != nil {
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_ = s.Close()
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return err
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}
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log.INFO.Printf("acquired lock=%s, duration=%s", key, ttl)
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return nil
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}
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