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
+}

ocis/pkg/command/root.go

@@ -4,14 +4,11 @@ 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"
-	"github.com/micro/go-micro/v2/registry"
 
 	"github.com/micro/cli/v2"
 	"github.com/owncloud/ocis/ocis-pkg/log"
+	oregistry "github.com/owncloud/ocis/ocis-pkg/registry"
 	"github.com/owncloud/ocis/ocis/pkg/config"
 	"github.com/owncloud/ocis/ocis/pkg/flagset"
 	"github.com/owncloud/ocis/ocis/pkg/register"
@@ -50,15 +47,7 @@ func Execute() error {
 		)
 	}
 
-	addresses := strings.Split(os.Getenv("MICRO_REGISTRY_ADDRESS"), ",")
+	r := *oregistry.GetRegistry()
-
-	var r registry.Registry
-	switch os.Getenv("MICRO_REGISTRY") {
-	case "etcd":
-		r = etcdr.NewRegistry(registry.Addrs(addresses...))
-	default:
-		r = mdnsr.NewRegistry()
-	}
 
 	opts := micro.Options{
 		Registry: r,

storage/pkg/service/external/external.go

@@ -2,16 +2,12 @@ package external
 
 import (
 	"context"
-	"os"
-	"strings"
 	"time"
 
-	etcdr "github.com/micro/go-micro/v2/registry/etcd"
-	mdnsr "github.com/micro/go-micro/v2/registry/mdns"
-
 	"github.com/micro/go-micro/v2/broker"
 	"github.com/micro/go-micro/v2/registry"
 	"github.com/owncloud/ocis/ocis-pkg/log"
+	oregistry "github.com/owncloud/ocis/ocis-pkg/registry"
 )
 
 // RegisterGRPCEndpoint publishes an arbitrary endpoint to the service-registry. This allows to query nodes of
@@ -29,15 +25,7 @@ func RegisterGRPCEndpoint(ctx context.Context, serviceID, uuid, addr string, log
 	node.Metadata["transport"] = "grpc"
 	node.Metadata["protocol"] = "grpc"
 
-	addresses := strings.Split(os.Getenv("MICRO_REGISTRY_ADDRESS"), ",")
+	r := *oregistry.GetRegistry()
-	var r registry.Registry
-
-	switch os.Getenv("MICRO_REGISTRY") {
-	case "etcd":
-		r = etcdr.NewRegistry(registry.Addrs(addresses...))
-	default:
-		r = mdnsr.NewRegistry()
-	}
 
 	service := &registry.Service{
 		Name:      serviceID,