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election.go
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election.go
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package election
import (
"fmt"
"sync"
"time"
"go.etcd.io/etcd/clientv3"
)
var (
leaderTickInterval = 50 * time.Millisecond
loopInterval = 100 * time.Millisecond
)
// Elector a leader elector
type Elector interface {
// CreateLeadship create a leadership
CreateLeadship(purpose string, nodeName, nodeValue string, allowCampaign bool, becomeLeader, becomeFollower func(string) bool) *Leadership
// Client etcd clientv3
Client() *clientv3.Client
}
type elector struct {
sync.RWMutex
options electorOptions
client *clientv3.Client
lessor clientv3.Lease
}
// NewElector create a elector
func NewElector(client *clientv3.Client, options ...ElectorOption) (Elector, error) {
e := &elector{
client: client,
lessor: clientv3.NewLease(client),
}
for _, opt := range options {
opt(&e.options)
}
e.options.adjust()
return e, nil
}
func (e *elector) CreateLeadship(purpose string, nodeName, nodeValue string, allowCampaign bool, becomeLeader, becomeFollower func(string) bool) *Leadership {
return newLeadership(e, purpose, nodeName, nodeValue, allowCampaign, becomeLeader, becomeFollower)
}
func (e *elector) Client() *clientv3.Client {
return e.client
}
func getPurposePath(prefix string, purpose string) string {
return fmt.Sprintf("%s/%s", prefix, purpose)
}
func getPurposeExpectPath(prefix string, purpose string) string {
return fmt.Sprintf("%s/expect-%s", prefix, purpose)
}