116 lines
1.9 KiB
Go
116 lines
1.9 KiB
Go
// Package etcd is an etcd implementation of lock
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package etcd
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import (
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"context"
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"errors"
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"log"
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"path"
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"strings"
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"sync"
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"github.com/micro/go-micro/sync/lock"
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client "go.etcd.io/etcd/clientv3"
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cc "go.etcd.io/etcd/clientv3/concurrency"
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)
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type etcdLock struct {
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opts lock.Options
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path string
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client *client.Client
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sync.Mutex
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locks map[string]*elock
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}
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type elock struct {
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s *cc.Session
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m *cc.Mutex
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}
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func (e *etcdLock) Acquire(id string, opts ...lock.AcquireOption) error {
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var options lock.AcquireOptions
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for _, o := range opts {
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o(&options)
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}
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// make path
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path := path.Join(e.path, strings.Replace(e.opts.Prefix+id, "/", "-", -1))
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var sopts []cc.SessionOption
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if options.TTL > 0 {
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sopts = append(sopts, cc.WithTTL(int(options.TTL.Seconds())))
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}
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s, err := cc.NewSession(e.client, sopts...)
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if err != nil {
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return err
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}
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m := cc.NewMutex(s, path)
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ctx, _ := context.WithCancel(context.Background())
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if err := m.Lock(ctx); err != nil {
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return err
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}
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e.Lock()
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e.locks[id] = &elock{
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s: s,
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m: m,
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}
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e.Unlock()
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return nil
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}
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func (e *etcdLock) Release(id string) error {
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e.Lock()
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defer e.Unlock()
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v, ok := e.locks[id]
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if !ok {
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return errors.New("lock not found")
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}
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err := v.m.Unlock(context.Background())
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delete(e.locks, id)
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return err
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}
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func (e *etcdLock) String() string {
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return "etcd"
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}
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func NewLock(opts ...lock.Option) lock.Lock {
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var options lock.Options
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for _, o := range opts {
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o(&options)
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}
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var endpoints []string
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for _, addr := range options.Nodes {
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if len(addr) > 0 {
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endpoints = append(endpoints, addr)
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}
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}
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if len(endpoints) == 0 {
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endpoints = []string{"http://127.0.0.1:2379"}
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}
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// TODO: parse addresses
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c, err := client.New(client.Config{
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Endpoints: endpoints,
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})
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if err != nil {
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log.Fatal(err)
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}
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return &etcdLock{
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path: "/micro/lock",
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client: c,
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opts: options,
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locks: make(map[string]*elock),
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}
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}
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