🎉 Initial Commit

pkg/shared/registrar/README.md

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+# Registrar
+
+The Registrar is the service discovery system of the DysonNetwork.
+Here are a port to the Golang in order to support other Golang services.
+
+To use the system, try build with these API:
+
+```go
+package main
+
+import (
+	"log"
+	"os"
+	"os/signal"
+	"syscall"
+
+	"yourmodule/registry"
+)
+
+func main() {
+	endpoints := []string{"localhost:2379"}
+
+	registrar, err := registry.NewServiceRegistrar(endpoints)
+	if err != nil {
+		log.Fatalf("Error creating registrar: %v", err)
+	}
+
+	serviceName := "orders"
+	host := "10.0.0.5"
+	port := 5000
+	ttl := int64(30)
+
+	err = registrar.Register(serviceName, host, port, ttl)
+	if err != nil {
+		log.Fatalf("Register error: %v", err)
+	}
+	log.Println("Service registered")
+
+	// Wait for termination
+	stop := make(chan os.Signal, 1)
+	signal.Notify(stop, syscall.SIGINT, syscall.SIGTERM)
+	<-stop
+
+	err = registrar.Deregister()
+	if err != nil {
+		log.Printf("Deregister error: %v", err)
+	} else {
+		log.Println("Service deregistered")
+	}
+}
+```