Exclusive means that key value can only be 1:1, which means later added value will remove the keys associated with the same value previously.

NewPublisher returns a Publisher.

NewSubscriber returns a Subscriber.

RegisterAccount registers the username/password to the given etcd cluster.

RegisterTLS registers the CertFile/CertKeyFile/CACertFile to the given etcd.

WithId customizes a Publisher with the id.

WithPubEtcdAccount provides the etcd username/password.

WithPubEtcdTLS provides the etcd CertFile/CertKeyFile/CACertFile.

WithSubEtcdAccount provides the etcd username/password.

WithSubEtcdTLS provides the etcd CertFile/CertKeyFile/CACertFile.

TimeToLive is seconds to live in etcd.

EtcdConf is the config item with the given key on etcd.