[#1324] services/tree: Implement Object Tree Service

Object Tree Service allows changing trees assotiated with
the container in runtime.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

cmd/neofs-node/config/tree/config.go

@@ -0,0 +1,39 @@
+package treeconfig
+
+import (
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+)
+
+// GRPCConfig is a wrapper over "grpc" config section which provides access
+// to gRPC configuration of control service.
+type GRPCConfig struct {
+	cfg *config.Config
+}
+
+const (
+	subsection     = "tree"
+	grpcSubsection = "grpc"
+
+	// GRPCEndpointDefault is a default endpoint of gRPC Control service.
+	GRPCEndpointDefault = ""
+)
+
+// GRPC returns structure that provides access to "grpc" subsection of
+// "tree" section.
+func GRPC(c *config.Config) GRPCConfig {
+	return GRPCConfig{
+		c.Sub(subsection).Sub(grpcSubsection),
+	}
+}
+
+// Endpoint returns value of "endpoint" config parameter.
+//
+// Returns GRPCEndpointDefault if value is not a non-empty string.
+func (g GRPCConfig) Endpoint() string {
+	v := config.String(g.cfg, "endpoint")
+	if v != "" {
+		return v
+	}
+
+	return GRPCEndpointDefault
+}

cmd/neofs-node/config/tree/config_test.go

@@ -0,0 +1,30 @@
+package treeconfig_test
+
+import (
+	"testing"
+
+	"github.com/nspcc-dev/neofs-node/cmd/neofs-node/config"
+	configtest "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/test"
+	treeconfig "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/tree"
+	"github.com/stretchr/testify/require"
+)
+
+func TestControlSection(t *testing.T) {
+	t.Run("defaults", func(t *testing.T) {
+		empty := configtest.EmptyConfig()
+
+		require.Equal(t, treeconfig.GRPCEndpointDefault, treeconfig.GRPC(empty).Endpoint())
+	})
+
+	const path = "../../../../config/example/node"
+
+	var fileConfigTest = func(c *config.Config) {
+		require.Equal(t, "127.0.0.1:8091", treeconfig.GRPC(c).Endpoint())
+	}
+
+	configtest.ForEachFileType(path, fileConfigTest)
+
+	t.Run("ENV", func(t *testing.T) {
+		configtest.ForEnvFileType(path, fileConfigTest)
+	})
+}

cmd/neofs-node/main.go

@@ -81,6 +81,7 @@ func initApp(c *cfg) {
 	initAndLog(c, "pprof", initProfiler)
 	initAndLog(c, "prometheus", initMetrics)
 	initAndLog(c, "control", initControlService)
+	initAndLog(c, "tree", initTreeService)
 
 	initAndLog(c, "storage engine", func(c *cfg) {
 		fatalOnErr(c.cfgObject.cfgLocalStorage.localStorage.Open())

cmd/neofs-node/tree.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"context"
+	"net"
+
+	treeconfig "github.com/nspcc-dev/neofs-node/cmd/neofs-node/config/tree"
+	"github.com/nspcc-dev/neofs-node/pkg/services/tree"
+	"google.golang.org/grpc"
+)
+
+func initTreeService(c *cfg) {
+	endpoint := treeconfig.GRPC(c.appCfg).Endpoint()
+	if endpoint == treeconfig.GRPCEndpointDefault {
+		return
+	}
+
+	treeSvc := tree.New(
+		tree.WithContainerSource(c.cfgObject.cnrSource),
+		tree.WithNetmapSource(c.netMapSource),
+		tree.WithPrivateKey(&c.key.PrivateKey),
+		tree.WithLogger(c.log),
+		tree.WithStorage(c.cfgObject.cfgLocalStorage.localStorage))
+
+	treeServer := grpc.NewServer()
+
+	c.onShutdown(func() {
+		stopGRPC("NeoFS Tree Service API", treeServer, c.log)
+		treeSvc.Shutdown()
+	})
+
+	lis, err := net.Listen("tcp", endpoint)
+	fatalOnErr(err)
+
+	tree.RegisterTreeServiceServer(treeServer, treeSvc)
+
+	c.workers = append(c.workers, newWorkerFromFunc(func(ctx context.Context) {
+		treeSvc.Start(ctx)
+		fatalOnErr(treeServer.Serve(lis))
+	}))
+}