[#117] Refactor fetch/parse config parameters functions

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

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