[#1439] object: Sort nodes by priority metrics to compute GET request

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

cmd/frostfs-node/config.go

@@ -58,6 +58,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/control"
 	objectService "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object"
 	getsvc "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object/get"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object_manager/placement"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object_manager/tombstone"
 	tsourse "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/object_manager/tombstone/source"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/services/replicator"
@@ -109,6 +110,7 @@ type applicationConfiguration struct {
 
 	ObjectCfg struct {
 		tombstoneLifetime uint64
+		priorityMetrics   []placement.Metric
 	}
 
 	EngineCfg struct {
@@ -232,6 +234,15 @@ func (a *applicationConfiguration) readConfig(c *config.Config) error {
 	// Object
 
 	a.ObjectCfg.tombstoneLifetime = objectconfig.TombstoneLifetime(c)
+	var pm []placement.Metric
+	for _, raw := range objectconfig.Get(c).Priority() {
+		m, err := placement.ParseMetric(raw)
+		if err != nil {
+			return err
+		}
+		pm = append(pm, m)
+	}
+	a.ObjectCfg.priorityMetrics = pm
 
 	// Storage Engine
 

cmd/frostfs-node/config/object/config.go

@@ -10,10 +10,17 @@ type PutConfig struct {
 	cfg *config.Config
 }
 
+// GetConfig is a wrapper over "get" config section which provides access
+// to object get pipeline configuration of object service.
+type GetConfig struct {
+	cfg *config.Config
+}
+
 const (
 	subsection = "object"
 
 	putSubsection = "put"
+	getSubsection = "get"
 
 	// PutPoolSizeDefault is a default value of routine pool size to
 	// process object.Put requests in object service.
@@ -56,3 +63,16 @@ func (g PutConfig) PoolSizeLocal() int {
 func (g PutConfig) SkipSessionTokenIssuerVerification() bool {
 	return config.BoolSafe(g.cfg, "skip_session_token_issuer_verification")
 }
+
+// Get returns structure that provides access to "get" subsection of
+// "object" section.
+func Get(c *config.Config) GetConfig {
+	return GetConfig{
+		c.Sub(subsection).Sub(getSubsection),
+	}
+}
+
+// Priority returns the value of "priority" config parameter.
+func (g GetConfig) Priority() []string {
+	return config.StringSliceSafe(g.cfg, "priority")
+}

cmd/frostfs-node/object.go

@@ -178,7 +178,8 @@ func initObjectService(c *cfg) {
 
 	sSearchV2 := createSearchSvcV2(sSearch, keyStorage)
 
-	sGet := createGetService(c, keyStorage, traverseGen, c.clientCache, c.cfgObject.cnrSource)
+	sGet := createGetService(c, keyStorage, traverseGen, c.clientCache, c.cfgObject.cnrSource,
+		c.ObjectCfg.priorityMetrics)
 
 	*c.cfgObject.getSvc = *sGet // need smth better
 
@@ -389,6 +390,7 @@ func createSearchSvcV2(sSearch *searchsvc.Service, keyStorage *util.KeyStorage)
 func createGetService(c *cfg, keyStorage *util.KeyStorage, traverseGen *util.TraverserGenerator,
 	coreConstructor *cache.ClientCache,
 	containerSource containercore.Source,
+	priorityMetrics []placement.Metric,
 ) *getsvc.Service {
 	ls := c.cfgObject.cfgLocalStorage.localStorage
 
@@ -398,6 +400,8 @@ func createGetService(c *cfg, keyStorage *util.KeyStorage, traverseGen *util.Tra
 		ls,
 		traverseGen.WithTraverseOptions(
 			placement.SuccessAfter(1),
+			placement.WithPriorityMetrics(priorityMetrics),
+			placement.WithNodeState(c),
 		),
 		coreConstructor,
 		containerSource,