[#117] Refactor fetch/parse config parameters functions

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

CHANGELOG.md

@@ -15,6 +15,7 @@ This document outlines major changes between releases.
 - Fix parsing signed headers in presigned urls (#182)
 
 ### Added
+- Add a metric with addresses of nodes of the same and highest priority that are currently healthy (#51)
 - Support dump metrics descriptions (#80)
 - Add `copies_numbers` section to `placement_policy` in config file and support vectors of copies numbers (#70, #101)
 - Support impersonate bearer token (#81, #105)

api/auth/presign_test.go

@@ -36,7 +36,7 @@ func (m credentialsMock) addBox(addr oid.Address, box *accessbox.Box) {
 func (m credentialsMock) GetBox(_ context.Context, addr oid.Address) (*accessbox.Box, error) {
 	box, ok := m.boxes[addr.String()]
 	if !ok {
-		return nil, apistatus.ObjectNotFound{}
+		return nil, &apistatus.ObjectNotFound{}
 	}
 
 	return box, nil

api/handler/delete.go

@@ -150,8 +150,7 @@ func isErrObjectLocked(err error) bool {
 	switch err.(type) {
 	default:
 		return strings.Contains(err.Error(), "object is locked")
-	case apistatus.ObjectLocked,
-		*apistatus.ObjectLocked:
+	case *apistatus.ObjectLocked:
 		return true
 	}
 }

api/handler/delete_test.go

@@ -28,7 +28,7 @@ func TestDeleteBucketOnAlreadyRemovedError(t *testing.T) {
 	putObject(t, hc, bktName, objName)
 
 	addr := getAddressOfLastVersion(hc, bktInfo, objName)
-	hc.tp.SetObjectError(addr, apistatus.ObjectAlreadyRemoved{})
+	hc.tp.SetObjectError(addr, &apistatus.ObjectAlreadyRemoved{})
 
 	deleteObjects(t, hc, bktName, [][2]string{{objName, emptyVersion}})
 
@@ -73,7 +73,7 @@ func TestDeleteBucketOnNotFoundError(t *testing.T) {
 	var addr oid.Address
 	addr.SetContainer(bktInfo.CID)
 	addr.SetObject(nodeVersion.OID)
-	hc.tp.SetObjectError(addr, apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(addr, &apistatus.ObjectNotFound{})
 
 	deleteObjects(t, hc, bktName, [][2]string{{objName, emptyVersion}})
 

api/handler/get_test.go

@@ -192,8 +192,8 @@ func TestGetObject(t *testing.T) {
 	checkFound(hc.t, hc, bktName, objName, emptyVersion)
 
 	addr := getAddressOfLastVersion(hc, bktInfo, objName)
-	hc.tp.SetObjectError(addr, apistatus.ObjectNotFound{})
-	hc.tp.SetObjectError(objInfo.Address(), apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(addr, &apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(objInfo.Address(), &apistatus.ObjectNotFound{})
 
 	getObjectAssertS3Error(hc, bktName, objName, objInfo.VersionID(), s3errors.ErrNoSuchVersion)
 	getObjectAssertS3Error(hc, bktName, objName, emptyVersion, s3errors.ErrNoSuchKey)

api/handler/head_test.go

@@ -120,8 +120,8 @@ func TestHeadObject(t *testing.T) {
 	checkFound(hc.t, hc, bktName, objName, emptyVersion)
 
 	addr := getAddressOfLastVersion(hc, bktInfo, objName)
-	hc.tp.SetObjectError(addr, apistatus.ObjectNotFound{})
-	hc.tp.SetObjectError(objInfo.Address(), apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(addr, &apistatus.ObjectNotFound{})
+	hc.tp.SetObjectError(objInfo.Address(), &apistatus.ObjectNotFound{})
 
 	headObjectAssertS3Error(hc, bktName, objName, objInfo.VersionID(), s3errors.ErrNoSuchVersion)
 	headObjectAssertS3Error(hc, bktName, objName, emptyVersion, s3errors.ErrNoSuchKey)

api/layer/frostfs_mock.go

@@ -198,7 +198,7 @@ func (t *TestFrostFS) ReadObject(ctx context.Context, prm PrmObjectRead) (*Objec
 		}, nil
 	}
 
-	return nil, fmt.Errorf("%w: %s", apistatus.ObjectNotFound{}, addr)
+	return nil, fmt.Errorf("%w: %s", &apistatus.ObjectNotFound{}, addr)
 }
 
 func (t *TestFrostFS) CreateObject(_ context.Context, prm PrmObjectCreate) (oid.ID, error) {

cmd/s3-gw/app.go

@@ -8,7 +8,6 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
-	"strconv"
 	"sync"
 	"sync/atomic"
 	"syscall"
@@ -189,15 +188,6 @@ func (s *appSettings) setBypassContentEncodingInChunks(bypass bool) {
 	s.bypassContentEncodingInChunks.Store(bypass)
 }
 
-func getDefaultPolicyValue(v *viper.Viper) string {
-	defaultPolicyStr := handler.DefaultPolicy
-	if v.IsSet(cfgPolicyDefault) {
-		defaultPolicyStr = v.GetString(cfgPolicyDefault)
-	}
-
-	return defaultPolicyStr
-}
-
 func (a *App) initAPI(ctx context.Context) {
 	a.initLayer(ctx)
 	a.initHandler()
@@ -270,15 +260,9 @@ func (a *App) shutdownTracing() {
 func newMaxClients(cfg *viper.Viper) maxClientsConfig {
 	config := maxClientsConfig{}
 
-	config.count = cfg.GetInt(cfgMaxClientsCount)
-	if config.count <= 0 {
-		config.count = defaultMaxClientsCount
-	}
+	config.count = fetchMaxClientsCount(cfg)
 
-	config.deadline = cfg.GetDuration(cfgMaxClientsDeadline)
-	if config.deadline <= 0 {
-		config.deadline = defaultMaxClientsDeadline
-	}
+	config.deadline = fetchMaxClientsDeadline(cfg)
 
 	return config
 }
@@ -302,38 +286,23 @@ func getPools(ctx context.Context, logger *zap.Logger, cfg *viper.Viper) (*pool.
 		prmTree.AddNode(peer)
 	}
 
-	connTimeout := cfg.GetDuration(cfgConnectTimeout)
-	if connTimeout <= 0 {
-		connTimeout = defaultConnectTimeout
-	}
+	connTimeout := fetchConnectTimeout(cfg)
 	prm.SetNodeDialTimeout(connTimeout)
 	prmTree.SetNodeDialTimeout(connTimeout)
 
-	streamTimeout := cfg.GetDuration(cfgStreamTimeout)
-	if streamTimeout <= 0 {
-		streamTimeout = defaultStreamTimeout
-	}
+	streamTimeout := fetchStreamTimeout(cfg)
 	prm.SetNodeStreamTimeout(streamTimeout)
 	prmTree.SetNodeStreamTimeout(streamTimeout)
 
-	healthCheckTimeout := cfg.GetDuration(cfgHealthcheckTimeout)
-	if healthCheckTimeout <= 0 {
-		healthCheckTimeout = defaultHealthcheckTimeout
-	}
+	healthCheckTimeout := fetchHealthCheckTimeout(cfg)
 	prm.SetHealthcheckTimeout(healthCheckTimeout)
 	prmTree.SetHealthcheckTimeout(healthCheckTimeout)
 
-	rebalanceInterval := cfg.GetDuration(cfgRebalanceInterval)
-	if rebalanceInterval <= 0 {
-		rebalanceInterval = defaultRebalanceInterval
-	}
+	rebalanceInterval := fetchRebalanceInterval(cfg)
 	prm.SetClientRebalanceInterval(rebalanceInterval)
 	prmTree.SetClientRebalanceInterval(rebalanceInterval)
 
-	errorThreshold := cfg.GetUint32(cfgPoolErrorThreshold)
-	if errorThreshold <= 0 {
-		errorThreshold = defaultPoolErrorThreshold
-	}
+	errorThreshold := fetchErrorThreshold(cfg)
 	prm.SetErrorThreshold(errorThreshold)
 	prm.SetLogger(logger)
 	prmTree.SetLogger(logger)
@@ -380,7 +349,7 @@ func newPlacementPolicy(l *zap.Logger, v *viper.Viper) (*placementPolicy, error)
 	policies.updateCopiesNumbers(l, v)
 	policies.updateDefaultCopiesNumbers(l, v)
 
-	return policies, policies.updatePolicy(getDefaultPolicyValue(v), v.GetString(cfgPolicyRegionMapFile))
+	return policies, policies.updatePolicy(v)
 }
 
 func (p *placementPolicy) DefaultPlacementPolicy() netmap.PlacementPolicy {
@@ -412,7 +381,7 @@ func (p *placementPolicy) DefaultCopiesNumbers() []uint32 {
 }
 
 func (p *placementPolicy) update(l *zap.Logger, v *viper.Viper) {
-	if err := p.updatePolicy(getDefaultPolicyValue(v), v.GetString(cfgPolicyRegionMapFile)); err != nil {
+	if err := p.updatePolicy(v); err != nil {
 		l.Warn("policies won't be updated", zap.Error(err))
 	}
 
@@ -420,31 +389,15 @@ func (p *placementPolicy) update(l *zap.Logger, v *viper.Viper) {
 	p.updateDefaultCopiesNumbers(l, v)
 }
 
-func (p *placementPolicy) updatePolicy(defaultPolicy string, regionPolicyFilepath string) error {
-	var defaultPlacementPolicy netmap.PlacementPolicy
-	if err := defaultPlacementPolicy.DecodeString(defaultPolicy); err != nil {
-		return fmt.Errorf("parse default policy '%s': %w", defaultPolicy, err)
-	}
-
-	regionPolicyMap, err := readRegionMap(regionPolicyFilepath)
+func (p *placementPolicy) updatePolicy(v *viper.Viper) error {
+	defaultPlacementPolicy, err := fetchDefaultPolicy(v)
 	if err != nil {
-		return fmt.Errorf("read region map file: %w", err)
+		return err
 	}
 
-	regionMap := make(map[string]netmap.PlacementPolicy, len(regionPolicyMap))
-	for region, policy := range regionPolicyMap {
-		var pp netmap.PlacementPolicy
-		if err = pp.DecodeString(policy); err == nil {
-			regionMap[region] = pp
-			continue
-		}
-
-		if err = pp.UnmarshalJSON([]byte(policy)); err == nil {
-			regionMap[region] = pp
-			continue
-		}
-
-		return fmt.Errorf("parse region '%s' to policy mapping: %w", region, err)
+	regionMap, err := fetchRegionMappingPolicies(v)
+	if err != nil {
+		return err
 	}
 
 	p.mu.Lock()
@@ -699,14 +652,7 @@ func (a *App) stopServices() {
 func getNotificationsOptions(v *viper.Viper, l *zap.Logger) *notifications.Options {
 	cfg := notifications.Options{}
 	cfg.URL = v.GetString(cfgNATSEndpoint)
-	cfg.Timeout = v.GetDuration(cfgNATSTimeout)
-	if cfg.Timeout <= 0 {
-		l.Error("invalid lifetime, using default value (in seconds)",
-			zap.String("parameter", cfgNATSTimeout),
-			zap.Duration("value in config", cfg.Timeout),
-			zap.Duration("default", notifications.DefaultTimeout))
-		cfg.Timeout = notifications.DefaultTimeout
-	}
+	cfg.Timeout = fetchNATSTimeout(v, l)
 	cfg.TLSCertFilepath = v.GetString(cfgNATSTLSCertFile)
 	cfg.TLSAuthPrivateKeyFilePath = v.GetString(cfgNATSAuthPrivateKeyFile)
 	cfg.RootCAFiles = v.GetStringSlice(cfgNATSRootCAFiles)
@@ -717,62 +663,32 @@ func getNotificationsOptions(v *viper.Viper, l *zap.Logger) *notifications.Optio
 func getCacheOptions(v *viper.Viper, l *zap.Logger) *layer.CachesConfig {
 	cacheCfg := layer.DefaultCachesConfigs(l)
 
-	cacheCfg.Objects.Lifetime = getLifetime(v, l, cfgObjectsCacheLifetime, cacheCfg.Objects.Lifetime)
-	cacheCfg.Objects.Size = getSize(v, l, cfgObjectsCacheSize, cacheCfg.Objects.Size)
+	cacheCfg.Objects.Lifetime = fetchCacheLifetime(v, l, cfgObjectsCacheLifetime, cacheCfg.Objects.Lifetime)
+	cacheCfg.Objects.Size = fetchCacheSize(v, l, cfgObjectsCacheSize, cacheCfg.Objects.Size)
 
-	cacheCfg.ObjectsList.Lifetime = getLifetime(v, l, cfgListObjectsCacheLifetime, cacheCfg.ObjectsList.Lifetime)
-	cacheCfg.ObjectsList.Size = getSize(v, l, cfgListObjectsCacheSize, cacheCfg.ObjectsList.Size)
+	cacheCfg.ObjectsList.Lifetime = fetchCacheLifetime(v, l, cfgListObjectsCacheLifetime, cacheCfg.ObjectsList.Lifetime)
+	cacheCfg.ObjectsList.Size = fetchCacheSize(v, l, cfgListObjectsCacheSize, cacheCfg.ObjectsList.Size)
 
-	cacheCfg.Buckets.Lifetime = getLifetime(v, l, cfgBucketsCacheLifetime, cacheCfg.Buckets.Lifetime)
-	cacheCfg.Buckets.Size = getSize(v, l, cfgBucketsCacheSize, cacheCfg.Buckets.Size)
+	cacheCfg.Buckets.Lifetime = fetchCacheLifetime(v, l, cfgBucketsCacheLifetime, cacheCfg.Buckets.Lifetime)
+	cacheCfg.Buckets.Size = fetchCacheSize(v, l, cfgBucketsCacheSize, cacheCfg.Buckets.Size)
 
-	cacheCfg.Names.Lifetime = getLifetime(v, l, cfgNamesCacheLifetime, cacheCfg.Names.Lifetime)
-	cacheCfg.Names.Size = getSize(v, l, cfgNamesCacheSize, cacheCfg.Names.Size)
+	cacheCfg.Names.Lifetime = fetchCacheLifetime(v, l, cfgNamesCacheLifetime, cacheCfg.Names.Lifetime)
+	cacheCfg.Names.Size = fetchCacheSize(v, l, cfgNamesCacheSize, cacheCfg.Names.Size)
 
-	cacheCfg.System.Lifetime = getLifetime(v, l, cfgSystemCacheLifetime, cacheCfg.System.Lifetime)
-	cacheCfg.System.Size = getSize(v, l, cfgSystemCacheSize, cacheCfg.System.Size)
+	cacheCfg.System.Lifetime = fetchCacheLifetime(v, l, cfgSystemCacheLifetime, cacheCfg.System.Lifetime)
+	cacheCfg.System.Size = fetchCacheSize(v, l, cfgSystemCacheSize, cacheCfg.System.Size)
 
-	cacheCfg.AccessControl.Lifetime = getLifetime(v, l, cfgAccessControlCacheLifetime, cacheCfg.AccessControl.Lifetime)
-	cacheCfg.AccessControl.Size = getSize(v, l, cfgAccessControlCacheSize, cacheCfg.AccessControl.Size)
+	cacheCfg.AccessControl.Lifetime = fetchCacheLifetime(v, l, cfgAccessControlCacheLifetime, cacheCfg.AccessControl.Lifetime)
+	cacheCfg.AccessControl.Size = fetchCacheSize(v, l, cfgAccessControlCacheSize, cacheCfg.AccessControl.Size)
 
 	return cacheCfg
 }
 
-func getLifetime(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue time.Duration) time.Duration {
-	if v.IsSet(cfgEntry) {
-		lifetime := v.GetDuration(cfgEntry)
-		if lifetime <= 0 {
-			l.Error("invalid lifetime, using default value (in seconds)",
-				zap.String("parameter", cfgEntry),
-				zap.Duration("value in config", lifetime),
-				zap.Duration("default", defaultValue))
-		} else {
-			return lifetime
-		}
-	}
-	return defaultValue
-}
-
-func getSize(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue int) int {
-	if v.IsSet(cfgEntry) {
-		size := v.GetInt(cfgEntry)
-		if size <= 0 {
-			l.Error("invalid cache size, using default value",
-				zap.String("parameter", cfgEntry),
-				zap.Int("value in config", size),
-				zap.Int("default", defaultValue))
-		} else {
-			return size
-		}
-	}
-	return defaultValue
-}
-
 func getAccessBoxCacheConfig(v *viper.Viper, l *zap.Logger) *cache.Config {
 	cacheCfg := cache.DefaultAccessBoxConfig(l)
 
-	cacheCfg.Lifetime = getLifetime(v, l, cfgAccessBoxCacheLifetime, cacheCfg.Lifetime)
-	cacheCfg.Size = getSize(v, l, cfgAccessBoxCacheSize, cacheCfg.Size)
+	cacheCfg.Lifetime = fetchCacheLifetime(v, l, cfgAccessBoxCacheLifetime, cacheCfg.Lifetime)
+	cacheCfg.Size = fetchCacheSize(v, l, cfgAccessBoxCacheSize, cacheCfg.Size)
 
 	return cacheCfg
 }
@@ -780,22 +696,11 @@ func getAccessBoxCacheConfig(v *viper.Viper, l *zap.Logger) *cache.Config {
 func (a *App) initHandler() {
 	cfg := &handler.Config{
 		Policy:             a.settings.policies,
-		DefaultMaxAge:      handler.DefaultMaxAge,
+		DefaultMaxAge:      fetchDefaultMaxAge(a.cfg, a.log),
 		NotificatorEnabled: a.cfg.GetBool(cfgEnableNATS),
 		XMLDecoder:         a.settings.xmlDecoder,
 	}
 
-	if a.cfg.IsSet(cfgDefaultMaxAge) {
-		defaultMaxAge := a.cfg.GetInt(cfgDefaultMaxAge)
-
-		if defaultMaxAge <= 0 && defaultMaxAge != -1 {
-			a.log.Fatal("invalid defaultMaxAge",
-				zap.String("parameter", cfgDefaultMaxAge),
-				zap.String("value in config", strconv.Itoa(defaultMaxAge)))
-		}
-		cfg.DefaultMaxAge = defaultMaxAge
-	}
-
 	cfg.ResolveZoneList = a.cfg.GetStringSlice(cfgResolveBucketAllow)
 	cfg.IsResolveListAllow = len(cfg.ResolveZoneList) > 0
 	if !cfg.IsResolveListAllow {

cmd/s3-gw/app_settings.go

@@ -10,8 +10,11 @@ import (
 	"strings"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/handler"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/notifications"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/resolver"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
+	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
 	"github.com/spf13/pflag"
 	"github.com/spf13/viper"
@@ -156,6 +159,169 @@ var ignore = map[string]struct{}{
 	cmdVersion: {},
 }
 
+func fetchConnectTimeout(cfg *viper.Viper) time.Duration {
+	connTimeout := cfg.GetDuration(cfgConnectTimeout)
+	if connTimeout <= 0 {
+		connTimeout = defaultConnectTimeout
+	}
+
+	return connTimeout
+}
+
+func fetchStreamTimeout(cfg *viper.Viper) time.Duration {
+	streamTimeout := cfg.GetDuration(cfgStreamTimeout)
+	if streamTimeout <= 0 {
+		streamTimeout = defaultStreamTimeout
+	}
+
+	return streamTimeout
+}
+
+func fetchHealthCheckTimeout(cfg *viper.Viper) time.Duration {
+	healthCheckTimeout := cfg.GetDuration(cfgHealthcheckTimeout)
+	if healthCheckTimeout <= 0 {
+		healthCheckTimeout = defaultHealthcheckTimeout
+	}
+
+	return healthCheckTimeout
+}
+
+func fetchRebalanceInterval(cfg *viper.Viper) time.Duration {
+	rebalanceInterval := cfg.GetDuration(cfgRebalanceInterval)
+	if rebalanceInterval <= 0 {
+		rebalanceInterval = defaultRebalanceInterval
+	}
+
+	return rebalanceInterval
+}
+
+func fetchErrorThreshold(cfg *viper.Viper) uint32 {
+	errorThreshold := cfg.GetUint32(cfgPoolErrorThreshold)
+	if errorThreshold <= 0 {
+		errorThreshold = defaultPoolErrorThreshold
+	}
+
+	return errorThreshold
+}
+
+func fetchMaxClientsCount(cfg *viper.Viper) int {
+	maxClientsCount := cfg.GetInt(cfgMaxClientsCount)
+	if maxClientsCount <= 0 {
+		maxClientsCount = defaultMaxClientsCount
+	}
+
+	return maxClientsCount
+}
+
+func fetchMaxClientsDeadline(cfg *viper.Viper) time.Duration {
+	maxClientsDeadline := cfg.GetDuration(cfgMaxClientsDeadline)
+	if maxClientsDeadline <= 0 {
+		maxClientsDeadline = defaultMaxClientsDeadline
+	}
+
+	return maxClientsDeadline
+}
+
+func fetchDefaultPolicy(cfg *viper.Viper) (netmap.PlacementPolicy, error) {
+	defaultPolicyStr := handler.DefaultPolicy
+	if cfg.IsSet(cfgPolicyDefault) {
+		defaultPolicyStr = cfg.GetString(cfgPolicyDefault)
+	}
+
+	var defaultPlacementPolicy netmap.PlacementPolicy
+	if err := defaultPlacementPolicy.DecodeString(defaultPolicyStr); err != nil {
+		return netmap.PlacementPolicy{}, fmt.Errorf("parse default policy '%s': %w", defaultPolicyStr, err)
+	}
+
+	return defaultPlacementPolicy, nil
+}
+
+func fetchNATSTimeout(cfg *viper.Viper, l *zap.Logger) time.Duration {
+	timeout := cfg.GetDuration(cfgNATSTimeout)
+	if timeout <= 0 {
+		l.Error("invalid lifetime, using default value (in seconds)",
+			zap.String("parameter", cfgNATSTimeout),
+			zap.Duration("value in config", timeout),
+			zap.Duration("default", notifications.DefaultTimeout))
+		timeout = notifications.DefaultTimeout
+	}
+
+	return timeout
+}
+
+func fetchCacheLifetime(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue time.Duration) time.Duration {
+	if v.IsSet(cfgEntry) {
+		lifetime := v.GetDuration(cfgEntry)
+		if lifetime <= 0 {
+			l.Error("invalid lifetime, using default value (in seconds)",
+				zap.String("parameter", cfgEntry),
+				zap.Duration("value in config", lifetime),
+				zap.Duration("default", defaultValue))
+		} else {
+			return lifetime
+		}
+	}
+
+	return defaultValue
+}
+
+func fetchCacheSize(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue int) int {
+	if v.IsSet(cfgEntry) {
+		size := v.GetInt(cfgEntry)
+		if size <= 0 {
+			l.Error("invalid cache size, using default value",
+				zap.String("parameter", cfgEntry),
+				zap.Int("value in config", size),
+				zap.Int("default", defaultValue))
+		} else {
+			return size
+		}
+	}
+
+	return defaultValue
+}
+
+func fetchDefaultMaxAge(cfg *viper.Viper, l *zap.Logger) int {
+	defaultMaxAge := handler.DefaultMaxAge
+
+	if cfg.IsSet(cfgDefaultMaxAge) {
+		defaultMaxAge = cfg.GetInt(cfgDefaultMaxAge)
+
+		if defaultMaxAge <= 0 && defaultMaxAge != -1 {
+			l.Fatal("invalid defaultMaxAge",
+				zap.String("parameter", cfgDefaultMaxAge),
+				zap.String("value in config", strconv.Itoa(defaultMaxAge)))
+		}
+	}
+
+	return defaultMaxAge
+}
+
+func fetchRegionMappingPolicies(cfg *viper.Viper) (map[string]netmap.PlacementPolicy, error) {
+	regionPolicyMap, err := readRegionMap(cfg.GetString(cfgPolicyRegionMapFile))
+	if err != nil {
+		return nil, fmt.Errorf("read region map file: %w", err)
+	}
+
+	regionMap := make(map[string]netmap.PlacementPolicy, len(regionPolicyMap))
+	for region, policy := range regionPolicyMap {
+		var pp netmap.PlacementPolicy
+		if err = pp.DecodeString(policy); err == nil {
+			regionMap[region] = pp
+			continue
+		}
+
+		if err = pp.UnmarshalJSON([]byte(policy)); err == nil {
+			regionMap[region] = pp
+			continue
+		}
+
+		return nil, fmt.Errorf("parse region '%s' to policy mapping: %w", region, err)
+	}
+
+	return regionMap, nil
+}
+
 func fetchDefaultCopiesNumbers(v *viper.Viper) ([]uint32, error) {
 	unparsed := v.GetStringSlice(cfgSetCopiesNumber)
 	var result []uint32

go.mod

@@ -5,7 +5,7 @@ go 1.19
 require (
 	git.frostfs.info/TrueCloudLab/frostfs-api-go/v2 v2.15.1-0.20230802075510-964c3edb3f44
 	git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6
-	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230802103237-363f153eafa6
+	git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230821090303-202412230a05
 	github.com/aws/aws-sdk-go v1.44.6
 	github.com/bluele/gcache v0.0.2
 	github.com/go-chi/chi/v5 v5.0.8

go.sum

@@ -44,8 +44,10 @@ git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0 h1:FxqFDhQYYgpe41qsIHVOcdzSV
 git.frostfs.info/TrueCloudLab/frostfs-crypto v0.6.0/go.mod h1:RUIKZATQLJ+TaYQa60X2fTDwfuhMfm8Ar60bQ5fr+vU=
 git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6 h1:aGQ6QaAnTerQ5Dq5b2/f9DUQtSqPkZZ/bkMx/HKuLCo=
 git.frostfs.info/TrueCloudLab/frostfs-observability v0.0.0-20230531082742-c97d21411eb6/go.mod h1:W8Nn08/l6aQ7UlIbpF7FsQou7TVpcRD1ZT1KG4TrFhE=
-git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230802103237-363f153eafa6 h1:u6lzNotV6MEMNEG/XeS7g+FjPrrf+j4gnOHtvun2KJc=
-git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230802103237-363f153eafa6/go.mod h1:LI2GOj0pEx0jYTjB3QHja2PNhQFYL2pCm71RAFwDv0M=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230821073319-342524159ac3 h1:GBRTOTRrtIvxi2TgxG7z/J7uRXiyb1SxR4247FaYCgU=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230821073319-342524159ac3/go.mod h1:t1akKcUH7iBrFHX8rSXScYMP17k2kYQXMbZooiL5Juw=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230821090303-202412230a05 h1:OuViMF54N87FXmaBEpYw3jhzaLrJ/EWOlPL1wUkimE0=
+git.frostfs.info/TrueCloudLab/frostfs-sdk-go v0.0.0-20230821090303-202412230a05/go.mod h1:t1akKcUH7iBrFHX8rSXScYMP17k2kYQXMbZooiL5Juw=
 git.frostfs.info/TrueCloudLab/hrw v1.2.1 h1:ccBRK21rFvY5R1WotI6LNoPlizk7qSvdfD8lNIRudVc=
 git.frostfs.info/TrueCloudLab/hrw v1.2.1/go.mod h1:C1Ygde2n843yTZEQ0FP69jYiuaYV0kriLvP4zm8JuvM=
 git.frostfs.info/TrueCloudLab/rfc6979 v0.4.0 h1:M2KR3iBj7WpY3hP10IevfIB9MURr4O9mwVfJ+SjT3HA=

internal/frostfs/errors/errors.go

@@ -25,8 +25,6 @@ func IsErrObjectAccessDenied(err error) (string, bool) {
 	switch err := err.(type) {
 	default:
 		return "", false
-	case apistatus.ObjectAccessDenied:
-		return err.Reason(), true
 	case *apistatus.ObjectAccessDenied:
 		return err.Reason(), true
 	}

internal/frostfs/frostfs.go

@@ -41,9 +41,7 @@ const (
 
 // NewFrostFS creates new FrostFS using provided pool.Pool.
 func NewFrostFS(p *pool.Pool, key *keys.PrivateKey) *FrostFS {
-	var await pool.WaitParams
-	await.SetPollInterval(defaultPollInterval)
-	await.SetTimeout(defaultPollTimeout)
+	await := pool.WaitParams{PollInterval: defaultPollInterval, Timeout: defaultPollTimeout}
 
 	var owner user.ID
 	user.IDFromKey(&owner, key.PrivateKey.PublicKey)
@@ -93,8 +91,7 @@ func (x *FrostFS) TimeToEpoch(ctx context.Context, now, futureTime time.Time) (u
 
 // Container implements frostfs.FrostFS interface method.
 func (x *FrostFS) Container(ctx context.Context, idCnr cid.ID) (*container.Container, error) {
-	var prm pool.PrmContainerGet
-	prm.SetContainerID(idCnr)
+	prm := pool.PrmContainerGet{ContainerID: idCnr}
 
 	res, err := x.pool.GetContainer(ctx, prm)
 	if err != nil {
@@ -167,13 +164,7 @@ func (x *FrostFS) UserContainers(ctx context.Context, id user.ID) ([]cid.ID, err
 
 // SetContainerEACL implements frostfs.FrostFS interface method.
 func (x *FrostFS) SetContainerEACL(ctx context.Context, table eacl.Table, sessionToken *session.Container) error {
-	var prm pool.PrmContainerSetEACL
-	prm.SetTable(table)
-	prm.SetWaitParams(x.await)
-
-	if sessionToken != nil {
-		prm.WithinSession(*sessionToken)
-	}
+	prm := pool.PrmContainerSetEACL{Table: table, Session: sessionToken, WaitParams: &x.await}
 
 	err := x.pool.SetEACL(ctx, prm)
 	return handleObjectError("save eACL via connection pool", err)
@@ -194,13 +185,7 @@ func (x *FrostFS) ContainerEACL(ctx context.Context, id cid.ID) (*eacl.Table, er
 
 // DeleteContainer implements frostfs.FrostFS interface method.
 func (x *FrostFS) DeleteContainer(ctx context.Context, id cid.ID, token *session.Container) error {
-	var prm pool.PrmContainerDelete
-	prm.SetContainerID(id)
-	prm.SetWaitParams(x.await)
-
-	if token != nil {
-		prm.SetSessionToken(*token)
-	}
+	prm := pool.PrmContainerDelete{ContainerID: id, Session: token, WaitParams: &x.await}
 
 	err := x.pool.DeleteContainer(ctx, prm)
 	return handleObjectError("delete container via connection pool", err)

metrics/desc.go

@@ -48,6 +48,14 @@ var appMetricsDesc = map[string]map[string]Description{
 			Help:           "Average request duration (in milliseconds) for specific method on node in pool",
 			VariableLabels: []string{"node", "method"},
 		},
+		currentNodesMetric: Description{
+			Type:           dto.MetricType_GAUGE,
+			Namespace:      namespace,
+			Subsystem:      poolSubsystem,
+			Name:           currentNodesMetric,
+			Help:           "Addresses of nodes of the same and highest priority that are currently healthy",
+			VariableLabels: []string{"address"},
+		},
 	},
 	billingSubsystem: {
 		userRequestsMetric: Description{

metrics/pool.go

@@ -15,6 +15,7 @@ const (
 	overallNodeRequestsMetric = "overall_node_requests"
 	currentErrorMetric        = "current_errors"
 	avgRequestDurationMetric  = "avg_request_duration"
+	currentNodesMetric        = "current_nodes"
 )
 
 const (
@@ -42,6 +43,7 @@ type poolMetricsCollector struct {
 	overallNodeRequests *prometheus.GaugeVec
 	currentErrors       *prometheus.GaugeVec
 	requestDuration     *prometheus.GaugeVec
+	currentNodes        *prometheus.GaugeVec
 }
 
 func newPoolMetricsCollector(scraper StatisticScraper) *poolMetricsCollector {
@@ -52,6 +54,7 @@ func newPoolMetricsCollector(scraper StatisticScraper) *poolMetricsCollector {
 		overallNodeRequests: mustNewGaugeVec(appMetricsDesc[poolSubsystem][overallNodeRequestsMetric]),
 		currentErrors:       mustNewGaugeVec(appMetricsDesc[poolSubsystem][currentErrorMetric]),
 		requestDuration:     mustNewGaugeVec(appMetricsDesc[poolSubsystem][avgRequestDurationMetric]),
+		currentNodes:        mustNewGaugeVec(appMetricsDesc[poolSubsystem][currentNodesMetric]),
 	}
 }
 
@@ -62,6 +65,7 @@ func (m *poolMetricsCollector) Collect(ch chan<- prometheus.Metric) {
 	m.overallNodeRequests.Collect(ch)
 	m.currentErrors.Collect(ch)
 	m.requestDuration.Collect(ch)
+	m.currentNodes.Collect(ch)
 }
 
 func (m *poolMetricsCollector) Describe(descs chan<- *prometheus.Desc) {
@@ -70,6 +74,7 @@ func (m *poolMetricsCollector) Describe(descs chan<- *prometheus.Desc) {
 	m.overallNodeRequests.Describe(descs)
 	m.currentErrors.Describe(descs)
 	m.requestDuration.Describe(descs)
+	m.currentNodes.Describe(descs)
 }
 
 func (m *poolMetricsCollector) updateStatistic() {
@@ -79,6 +84,7 @@ func (m *poolMetricsCollector) updateStatistic() {
 	m.overallNodeRequests.Reset()
 	m.currentErrors.Reset()
 	m.requestDuration.Reset()
+	m.currentNodes.Reset()
 
 	for _, node := range stat.Nodes() {
 		m.overallNodeErrors.WithLabelValues(node.Address()).Set(float64(node.OverallErrors()))
@@ -88,6 +94,10 @@ func (m *poolMetricsCollector) updateStatistic() {
 		m.updateRequestsDuration(node)
 	}
 
+	for _, addr := range stat.CurrentNodes() {
+		m.currentNodes.WithLabelValues(addr).Set(1)
+	}
+
 	m.overallErrors.Set(float64(stat.OverallErrors()))
 }