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publisher.go
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publisher.go
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package discov
import (
"time"
"github.com/zeromicro/go-zero/core/discov/internal"
"github.com/zeromicro/go-zero/core/lang"
"github.com/zeromicro/go-zero/core/logx"
"github.com/zeromicro/go-zero/core/proc"
"github.com/zeromicro/go-zero/core/syncx"
"github.com/zeromicro/go-zero/core/threading"
clientv3 "go.etcd.io/etcd/client/v3"
)
type (
// PubOption defines the method to customize a Publisher.
PubOption func(client *Publisher)
// A Publisher can be used to publish the value to an etcd cluster on the given key.
Publisher struct {
endpoints []string
key string
fullKey string
id int64
value string
lease clientv3.LeaseID
quit *syncx.DoneChan
pauseChan chan lang.PlaceholderType
resumeChan chan lang.PlaceholderType
}
)
// NewPublisher returns a Publisher.
// endpoints is the hosts of the etcd cluster.
// key:value are a pair to be published.
// opts are used to customize the Publisher.
func NewPublisher(endpoints []string, key, value string, opts ...PubOption) *Publisher {
publisher := &Publisher{
endpoints: endpoints,
key: key,
value: value,
quit: syncx.NewDoneChan(),
pauseChan: make(chan lang.PlaceholderType),
resumeChan: make(chan lang.PlaceholderType),
}
for _, opt := range opts {
opt(publisher)
}
return publisher
}
// KeepAlive keeps key:value alive.
func (p *Publisher) KeepAlive() error {
cli, err := p.doRegister()
if err != nil {
return err
}
proc.AddWrapUpListener(func() {
p.Stop()
})
return p.keepAliveAsync(cli)
}
// Pause pauses the renewing of key:value.
func (p *Publisher) Pause() {
p.pauseChan <- lang.Placeholder
}
// Resume resumes the renewing of key:value.
func (p *Publisher) Resume() {
p.resumeChan <- lang.Placeholder
}
// Stop stops the renewing and revokes the registration.
func (p *Publisher) Stop() {
p.quit.Close()
}
func (p *Publisher) doKeepAlive() error {
ticker := time.NewTicker(time.Second)
defer ticker.Stop()
for range ticker.C {
select {
case <-p.quit.Done():
return nil
default:
cli, err := p.doRegister()
if err != nil {
logx.Errorf("etcd publisher doRegister: %s", err.Error())
break
}
if err := p.keepAliveAsync(cli); err != nil {
logx.Errorf("etcd publisher keepAliveAsync: %s", err.Error())
break
}
return nil
}
}
return nil
}
func (p *Publisher) doRegister() (internal.EtcdClient, error) {
cli, err := internal.GetRegistry().GetConn(p.endpoints)
if err != nil {
return nil, err
}
p.lease, err = p.register(cli)
return cli, err
}
func (p *Publisher) keepAliveAsync(cli internal.EtcdClient) error {
ch, err := cli.KeepAlive(cli.Ctx(), p.lease)
if err != nil {
return err
}
threading.GoSafe(func() {
for {
select {
case _, ok := <-ch:
if !ok {
p.revoke(cli)
if err := p.doKeepAlive(); err != nil {
logx.Errorf("etcd publisher KeepAlive: %s", err.Error())
}
return
}
case <-p.pauseChan:
logx.Infof("paused etcd renew, key: %s, value: %s", p.key, p.value)
p.revoke(cli)
select {
case <-p.resumeChan:
if err := p.doKeepAlive(); err != nil {
logx.Errorf("etcd publisher KeepAlive: %s", err.Error())
}
return
case <-p.quit.Done():
return
}
case <-p.quit.Done():
p.revoke(cli)
return
}
}
})
return nil
}
func (p *Publisher) register(client internal.EtcdClient) (clientv3.LeaseID, error) {
resp, err := client.Grant(client.Ctx(), TimeToLive)
if err != nil {
return clientv3.NoLease, err
}
lease := resp.ID
if p.id > 0 {
p.fullKey = makeEtcdKey(p.key, p.id)
} else {
p.fullKey = makeEtcdKey(p.key, int64(lease))
}
_, err = client.Put(client.Ctx(), p.fullKey, p.value, clientv3.WithLease(lease))
return lease, err
}
func (p *Publisher) revoke(cli internal.EtcdClient) {
if _, err := cli.Revoke(cli.Ctx(), p.lease); err != nil {
logx.Errorf("etcd publisher revoke: %s", err.Error())
}
}
// WithId customizes a Publisher with the id.
func WithId(id int64) PubOption {
return func(publisher *Publisher) {
publisher.id = id
}
}
// WithPubEtcdAccount provides the etcd username/password.
func WithPubEtcdAccount(user, pass string) PubOption {
return func(pub *Publisher) {
RegisterAccount(pub.endpoints, user, pass)
}
}
// WithPubEtcdTLS provides the etcd CertFile/CertKeyFile/CACertFile.
func WithPubEtcdTLS(certFile, certKeyFile, caFile string, insecureSkipVerify bool) PubOption {
return func(pub *Publisher) {
logx.Must(RegisterTLS(pub.endpoints, certFile, certKeyFile, caFile, insecureSkipVerify))
}
}