refactor registry awareness logic

ocis-pkg/registry/registry.go

@@ -0,0 +1,35 @@
+package registry
+
+import (
+	"os"
+	"strings"
+
+	etcdr "github.com/micro/go-micro/v2/registry/etcd"
+	mdnsr "github.com/micro/go-micro/v2/registry/mdns"
+
+	"github.com/micro/go-micro/v2/registry"
+)
+
+var (
+	registryEnv        = "MICRO_REGISTRY"
+	registryAddressEnv = "MICRO_REGISTRY_ADDRESS"
+)
+
+// GetRegistry returns a configured micro registry based on Micro env vars.
+// It defaults to mDNS, so mind that systems with mDNS disabled by default (i.e SUSE) will have a hard time
+// and it needs to explicitly use etcd. Os awareness for providing a working registry out of the box should be done.
+func GetRegistry() *registry.Registry {
+	addresses := strings.Split(os.Getenv(registryAddressEnv), ",")
+
+	var r registry.Registry
+	switch os.Getenv(registryEnv) {
+	case "etcd":
+		r = etcdr.NewRegistry(
+			registry.Addrs(addresses...),
+		)
+	default:
+		r = mdnsr.NewRegistry()
+	}
+
+	return &r
+}