Add sync => go-sync

sync/leader/leader.go

@@ -0,0 +1,25 @@
+// Package leader provides leader election
+package leader
+
+// Leader provides leadership election
+type Leader interface {
+	// elect leader
+	Elect(id string, opts ...ElectOption) (Elected, error)
+	// follow the leader
+	Follow() chan string
+}
+
+type Elected interface {
+	// id of leader
+	Id() string
+	// seek re-election
+	Reelect() error
+	// resign leadership
+	Resign() error
+	// observe leadership revocation
+	Revoked() chan bool
+}
+
+type Option func(o *Options)
+
+type ElectOption func(o *ElectOptions)