// IsLeader returns true if the current agent is the leader.
func (c *Candidate) IsLeader() bool {
consul := c.consulClient()
c.retrieveNode()
c.retrieveSession()
kv, _, err := consul.KV().Get(c.LeadershipKey, nil)
if err != nil {
logrus.Errorln("Unable to check for leadership:", err)
return false
}
if kv == nil {
logrus.Warnf("Leadership key '%s' is missing in Consuk KV.", c.LeadershipKey)
return false
}
return c.node == string(kv.Value) && c.session == kv.Session
}
// Resign forces the current agent to step down as the leader forcing a re-election. Nothing happens if the agent is not
// the current leader.
func (c *Candidate) Resign() {
if c.IsLeader() {
consul := c.consulClient()
kvpair := &consulapi.KVPair{
Key: c.LeadershipKey,
Value: []byte(c.node),
Session: c.session,
}
success, _, err := consul.KV().Release(kvpair, nil)
if !success || err != nil {
logrus.Warnf("%s was unable to step down as a leader", c.node)
} else {
logrus.Debugf("%s is no longer the leader.", c.node)
}
}
}