[#96] Move log messages to constants

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

api/cache/access_control.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
@@ -46,7 +47,7 @@ func (o *AccessControlCache) Get(owner user.ID, key string) bool {
 
 	result, ok := entry.(bool)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return false
 	}

api/cache/accessbox.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
@@ -57,7 +58,7 @@ func (o *AccessBoxCache) Get(address oid.Address) *accessbox.Box {
 
 	result, ok := entry.(*accessbox.Box)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}

api/cache/buckets.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
 )
@@ -46,7 +47,7 @@ func (o *BucketCache) Get(key string) *data.BucketInfo {
 
 	result, ok := entry.(*data.BucketInfo)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}

api/cache/names.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"time"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
@@ -48,7 +49,7 @@ func (o *ObjectsNameCache) Get(key string) *oid.Address {
 
 	result, ok := entry.(oid.Address)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}

api/cache/objects.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
@@ -47,7 +48,7 @@ func (o *ObjectsCache) GetObject(address oid.Address) *data.ExtendedObjectInfo {
 
 	result, ok := entry.(*data.ExtendedObjectInfo)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}

api/cache/objectslist.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
@@ -75,7 +76,7 @@ func (l *ObjectsListCache) GetVersions(key ObjectsListKey) []*data.NodeVersion {
 
 	result, ok := entry.([]*data.NodeVersion)
 	if !ok {
-		l.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		l.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}
@@ -94,7 +95,7 @@ func (l *ObjectsListCache) CleanCacheEntriesContainingObject(objectName string,
 	for _, key := range keys {
 		k, ok := key.(ObjectsListKey)
 		if !ok {
-			l.logger.Warn("invalid cache key type", zap.String("actual", fmt.Sprintf("%T", key)),
+			l.logger.Warn(logs.InvalidCacheKeyType, zap.String("actual", fmt.Sprintf("%T", key)),
 				zap.String("expected", fmt.Sprintf("%T", k)))
 			continue
 		}

api/cache/system.go

@@ -5,6 +5,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"github.com/bluele/gcache"
 	"go.uber.org/zap"
 )
@@ -48,7 +49,7 @@ func (o *SystemCache) GetObject(key string) *data.ObjectInfo {
 
 	result, ok := entry.(*data.ObjectInfo)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}
@@ -79,7 +80,7 @@ func (o *SystemCache) GetCORS(key string) *data.CORSConfiguration {
 
 	result, ok := entry.(*data.CORSConfiguration)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}
@@ -95,7 +96,7 @@ func (o *SystemCache) GetSettings(key string) *data.BucketSettings {
 
 	result, ok := entry.(*data.BucketSettings)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}
@@ -111,7 +112,7 @@ func (o *SystemCache) GetNotificationConfiguration(key string) *data.Notificatio
 
 	result, ok := entry.(*data.NotificationConfiguration)
 	if !ok {
-		o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
 		return nil
 	}

api/handler/acl.go

@@ -20,6 +20,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
@@ -470,7 +471,7 @@ func (h *handler) PutObjectACLHandler(w http.ResponseWriter, r *http.Request) {
 			ReqInfo:          reqInfo,
 		}
 		if err = h.sendNotifications(ctx, s); err != nil {
-			h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+			h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 		}
 	}
 	w.WriteHeader(http.StatusOK)
@@ -1460,7 +1461,7 @@ func (h *handler) encodeObjectACL(ctx context.Context, bucketACL *layer.BucketAC
 		if read {
 			permission = aclFullControl
 		} else {
-			h.reqLogger(ctx).Warn("some acl not fully mapped")
+			h.reqLogger(ctx).Warn(logs.SomeACLNotFullyMapped)
 		}
 
 		var grantee *Grantee

api/handler/api.go

@@ -11,6 +11,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap"
 	"go.uber.org/zap"
 )
@@ -75,7 +76,7 @@ func New(log *zap.Logger, obj layer.Client, notificator Notificator, cfg *Config
 	}
 
 	if !cfg.NotificatorEnabled {
-		log.Warn("notificator is disabled, s3 won't produce notification events")
+		log.Warn(logs.NotificatorIsDisabledS3WontProduceNotificationEvents)
 	} else if notificator == nil {
 		return nil, errors.New("empty notificator")
 	}

api/handler/copy.go

@@ -12,6 +12,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"go.uber.org/zap"
 )
@@ -249,7 +250,7 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	h.reqLogger(ctx).Info("object is copied", zap.Stringer("object_id", dstObjInfo.ID))
+	h.reqLogger(ctx).Info(logs.ObjectIsCopied, zap.Stringer("object_id", dstObjInfo.ID))
 
 	s := &SendNotificationParams{
 		Event:            EventObjectCreatedCopy,
@@ -258,7 +259,7 @@ func (h *handler) CopyObjectHandler(w http.ResponseWriter, r *http.Request) {
 		ReqInfo:          reqInfo,
 	}
 	if err = h.sendNotifications(ctx, s); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	if encryptionParams.Enabled() {

api/handler/cors.go

@@ -9,6 +9,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"go.uber.org/zap"
 )
 
@@ -99,13 +100,13 @@ func (h *handler) AppendCORSHeaders(w http.ResponseWriter, r *http.Request) {
 	}
 	bktInfo, err := h.obj.GetBucketInfo(ctx, reqInfo.BucketName)
 	if err != nil {
-		h.reqLogger(ctx).Warn("get bucket info", zap.Error(err))
+		h.reqLogger(ctx).Warn(logs.GetBucketInfo, zap.Error(err))
 		return
 	}
 
 	cors, err := h.obj.GetBucketCORS(ctx, bktInfo)
 	if err != nil {
-		h.reqLogger(ctx).Warn("get bucket cors", zap.Error(err))
+		h.reqLogger(ctx).Warn(logs.GetBucketCors, zap.Error(err))
 		return
 	}
 

api/handler/delete.go

@@ -11,6 +11,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
@@ -114,7 +115,7 @@ func (h *handler) DeleteObjectHandler(w http.ResponseWriter, r *http.Request) {
 		var objID oid.ID
 		if len(versionID) != 0 {
 			if err = objID.DecodeString(versionID); err != nil {
-				h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+				h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 			}
 		}
 
@@ -130,7 +131,7 @@ func (h *handler) DeleteObjectHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if err = h.sendNotifications(ctx, m); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	if deletedObject.VersionID != "" {
@@ -261,7 +262,7 @@ func (h *handler) DeleteMultipleObjectsHandler(w http.ResponseWriter, r *http.Re
 			zap.Array("objects", marshaler),
 			zap.Errors("errors", errs),
 		}
-		h.reqLogger(ctx).Error("couldn't delete objects", fields...)
+		h.reqLogger(ctx).Error(logs.CouldntDeleteObjects, fields...)
 	}
 
 	if err = middleware.EncodeToResponse(w, response); err != nil {

api/handler/multipart_upload.go

@@ -14,6 +14,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"github.com/google/uuid"
 	"go.uber.org/zap"
 )
@@ -511,7 +512,7 @@ func (h *handler) completeMultipartUpload(r *http.Request, c *layer.CompleteMult
 		ReqInfo:          reqInfo,
 	}
 	if err = h.sendNotifications(ctx, s); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	return objInfo, nil

api/handler/notifications.go

@@ -12,6 +12,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"github.com/google/uuid"
 )
@@ -202,7 +203,7 @@ func (h *handler) checkBucketConfiguration(ctx context.Context, conf *data.Notif
 				return
 			}
 		} else {
-			h.reqLogger(ctx).Warn("failed to send test event because notifications is disabled")
+			h.reqLogger(ctx).Warn(logs.FailedToSendTestEventBecauseNotificationsIsDisabled)
 		}
 
 		if q.ID == "" {

api/handler/put.go

@@ -24,6 +24,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/eacl"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"go.uber.org/zap"
@@ -277,7 +278,7 @@ func (h *handler) PutObjectHandler(w http.ResponseWriter, r *http.Request) {
 		ReqInfo:          reqInfo,
 	}
 	if err = h.sendNotifications(ctx, s); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	if containsACL {
@@ -494,7 +495,7 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 		ReqInfo:          reqInfo,
 	}
 	if err = h.sendNotifications(ctx, s); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	if acl := auth.MultipartFormValue(r, "acl"); acl != "" {
@@ -539,7 +540,7 @@ func (h *handler) PostObject(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if settings, err := h.obj.GetBucketSettings(ctx, bktInfo); err != nil {
-		h.reqLogger(ctx).Warn("couldn't get bucket versioning", zap.String("bucket name", reqInfo.BucketName), zap.Error(err))
+		h.reqLogger(ctx).Warn(logs.CouldntGetBucketVersioning, zap.String("bucket name", reqInfo.BucketName), zap.Error(err))
 	} else if settings.VersioningEnabled() {
 		w.Header().Set(api.AmzVersionID, objInfo.VersionID())
 	}
@@ -778,7 +779,7 @@ func (h *handler) CreateBucketHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	h.reqLogger(ctx).Info("bucket is created", zap.Stringer("container_id", bktInfo.CID))
+	h.reqLogger(ctx).Info(logs.BucketIsCreated, zap.Stringer("container_id", bktInfo.CID))
 
 	if p.ObjectLockEnabled {
 		sp := &layer.PutSettingsParams{

api/handler/tagging.go

@@ -13,6 +13,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"go.uber.org/zap"
 )
 
@@ -66,7 +67,7 @@ func (h *handler) PutObjectTaggingHandler(w http.ResponseWriter, r *http.Request
 		ReqInfo: reqInfo,
 	}
 	if err = h.sendNotifications(ctx, s); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	w.WriteHeader(http.StatusOK)
@@ -143,7 +144,7 @@ func (h *handler) DeleteObjectTaggingHandler(w http.ResponseWriter, r *http.Requ
 		ReqInfo: reqInfo,
 	}
 	if err = h.sendNotifications(ctx, s); err != nil {
-		h.reqLogger(ctx).Error("couldn't send notification: %w", zap.Error(err))
+		h.reqLogger(ctx).Error(logs.CouldntSendNotification, zap.Error(err))
 	}
 
 	w.WriteHeader(http.StatusNoContent)

api/handler/util.go

@@ -13,6 +13,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
 	frosterrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/session"
 	"go.uber.org/zap"
 )
@@ -36,7 +37,7 @@ func (h *handler) logAndSendError(w http.ResponseWriter, logText string, reqInfo
 		zap.String("description", logText),
 		zap.Error(err)}
 	fields = append(fields, additional...)
-	h.log.Error("request failed", fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
+	h.log.Error(logs.RequestFailed, fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
 }
 
 func (h *handler) logAndSendErrorNoHeader(w http.ResponseWriter, logText string, reqInfo *middleware.ReqInfo, err error, additional ...zap.Field) {
@@ -49,7 +50,7 @@ func (h *handler) logAndSendErrorNoHeader(w http.ResponseWriter, logText string,
 		zap.String("description", logText),
 		zap.Error(err)}
 	fields = append(fields, additional...)
-	h.log.Error("request failed", fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
+	h.log.Error(logs.RequestFailed, fields...) // consider using h.reqLogger (it requires accept context.Context or http.Request)
 }
 
 func transformToS3Error(err error) error {

api/layer/cache.go

@@ -3,6 +3,7 @@ package layer
 import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
@@ -61,7 +62,7 @@ func (c *Cache) GetBucket(name string) *data.BucketInfo {
 
 func (c *Cache) PutBucket(bktInfo *data.BucketInfo) {
 	if err := c.bucketCache.Put(bktInfo); err != nil {
-		c.logger.Warn("couldn't put bucket info into cache",
+		c.logger.Warn(logs.CouldntPutBucketInfoIntoCache,
 			zap.String("bucket name", bktInfo.Name),
 			zap.Stringer("bucket cid", bktInfo.CID),
 			zap.Error(err))
@@ -104,13 +105,13 @@ func (c *Cache) GetLastObject(owner user.ID, bktName, objName string) *data.Exte
 
 func (c *Cache) PutObject(owner user.ID, extObjInfo *data.ExtendedObjectInfo) {
 	if err := c.objCache.PutObject(extObjInfo); err != nil {
-		c.logger.Warn("couldn't add object to cache", zap.Error(err),
+		c.logger.Warn(logs.CouldntAddObjectToCache, zap.Error(err),
 			zap.String("object_name", extObjInfo.ObjectInfo.Name), zap.String("bucket_name", extObjInfo.ObjectInfo.Bucket),
 			zap.String("cid", extObjInfo.ObjectInfo.CID.EncodeToString()), zap.String("oid", extObjInfo.ObjectInfo.ID.EncodeToString()))
 	}
 
 	if err := c.accessCache.Put(owner, extObjInfo.ObjectInfo.Address().EncodeToString()); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }
 
@@ -118,7 +119,7 @@ func (c *Cache) PutObjectWithName(owner user.ID, extObjInfo *data.ExtendedObject
 	c.PutObject(owner, extObjInfo)
 
 	if err := c.namesCache.Put(extObjInfo.ObjectInfo.NiceName(), extObjInfo.ObjectInfo.Address()); err != nil {
-		c.logger.Warn("couldn't put obj address to name cache",
+		c.logger.Warn(logs.CouldntPutObjAddressToNameCache,
 			zap.String("obj nice name", extObjInfo.ObjectInfo.NiceName()),
 			zap.Error(err))
 	}
@@ -134,11 +135,11 @@ func (c *Cache) GetList(owner user.ID, key cache.ObjectsListKey) []*data.NodeVer
 
 func (c *Cache) PutList(owner user.ID, key cache.ObjectsListKey, list []*data.NodeVersion) {
 	if err := c.listsCache.PutVersions(key, list); err != nil {
-		c.logger.Warn("couldn't cache list of objects", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheListOfObjects, zap.Error(err))
 	}
 
 	if err := c.accessCache.Put(owner, key.String()); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }
 
@@ -152,11 +153,11 @@ func (c *Cache) GetTagging(owner user.ID, key string) map[string]string {
 
 func (c *Cache) PutTagging(owner user.ID, key string, tags map[string]string) {
 	if err := c.systemCache.PutTagging(key, tags); err != nil {
-		c.logger.Error("couldn't cache tags", zap.Error(err))
+		c.logger.Error(logs.CouldntCacheTags, zap.Error(err))
 	}
 
 	if err := c.accessCache.Put(owner, key); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }
 
@@ -174,11 +175,11 @@ func (c *Cache) GetLockInfo(owner user.ID, key string) *data.LockInfo {
 
 func (c *Cache) PutLockInfo(owner user.ID, key string, lockInfo *data.LockInfo) {
 	if err := c.systemCache.PutLockInfo(key, lockInfo); err != nil {
-		c.logger.Error("couldn't cache lock info", zap.Error(err))
+		c.logger.Error(logs.CouldntCacheLockInfo, zap.Error(err))
 	}
 
 	if err := c.accessCache.Put(owner, key); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }
 
@@ -195,11 +196,11 @@ func (c *Cache) GetSettings(owner user.ID, bktInfo *data.BucketInfo) *data.Bucke
 func (c *Cache) PutSettings(owner user.ID, bktInfo *data.BucketInfo, settings *data.BucketSettings) {
 	key := bktInfo.Name + bktInfo.SettingsObjectName()
 	if err := c.systemCache.PutSettings(key, settings); err != nil {
-		c.logger.Warn("couldn't cache bucket settings", zap.String("bucket", bktInfo.Name), zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheBucketSettings, zap.String("bucket", bktInfo.Name), zap.Error(err))
 	}
 
 	if err := c.accessCache.Put(owner, key); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }
 
@@ -217,11 +218,11 @@ func (c *Cache) PutCORS(owner user.ID, bkt *data.BucketInfo, cors *data.CORSConf
 	key := bkt.Name + bkt.CORSObjectName()
 
 	if err := c.systemCache.PutCORS(key, cors); err != nil {
-		c.logger.Warn("couldn't cache cors", zap.String("bucket", bkt.Name), zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheCors, zap.String("bucket", bkt.Name), zap.Error(err))
 	}
 
 	if err := c.accessCache.Put(owner, key); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }
 
@@ -242,10 +243,10 @@ func (c *Cache) GetNotificationConfiguration(owner user.ID, bktInfo *data.Bucket
 func (c *Cache) PutNotificationConfiguration(owner user.ID, bktInfo *data.BucketInfo, configuration *data.NotificationConfiguration) {
 	key := bktInfo.Name + bktInfo.NotificationConfigurationObjectName()
 	if err := c.systemCache.PutNotificationConfiguration(key, configuration); err != nil {
-		c.logger.Warn("couldn't cache notification configuration", zap.String("bucket", bktInfo.Name), zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheNotificationConfiguration, zap.String("bucket", bktInfo.Name), zap.Error(err))
 	}
 
 	if err := c.accessCache.Put(owner, key); err != nil {
-		c.logger.Warn("couldn't cache access control operation", zap.Error(err))
+		c.logger.Warn(logs.CouldntCacheAccessControlOperation, zap.Error(err))
 	}
 }

api/layer/container.go

@@ -9,6 +9,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
@@ -63,7 +64,7 @@ func (n *layer) containerInfo(ctx context.Context, idCnr cid.ID) (*data.BucketIn
 	if len(attrLockEnabled) > 0 {
 		info.ObjectLockEnabled, err = strconv.ParseBool(attrLockEnabled)
 		if err != nil {
-			log.Error("could not parse container object lock enabled attribute",
+			log.Error(logs.CouldNotParseContainerObjectLockEnabledAttribute,
 				zap.String("lock_enabled", attrLockEnabled),
 				zap.Error(err),
 			)
@@ -78,7 +79,7 @@ func (n *layer) containerInfo(ctx context.Context, idCnr cid.ID) (*data.BucketIn
 func (n *layer) containerList(ctx context.Context) ([]*data.BucketInfo, error) {
 	res, err := n.frostFS.UserContainers(ctx, n.BearerOwner(ctx))
 	if err != nil {
-		n.reqLogger(ctx).Error("could not list user containers", zap.Error(err))
+		n.reqLogger(ctx).Error(logs.CouldNotListUserContainers, zap.Error(err))
 		return nil, err
 	}
 
@@ -86,7 +87,7 @@ func (n *layer) containerList(ctx context.Context) ([]*data.BucketInfo, error) {
 	for i := range res {
 		info, err := n.containerInfo(ctx, res[i])
 		if err != nil {
-			n.reqLogger(ctx).Error("could not fetch container info", zap.Error(err))
+			n.reqLogger(ctx).Error(logs.CouldNotFetchContainerInfo, zap.Error(err))
 			continue
 		}
 

api/layer/cors.go

@@ -10,6 +10,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"go.uber.org/zap"
 )
 
@@ -57,7 +58,7 @@ func (n *layer) PutBucketCORS(ctx context.Context, p *PutCORSParams) error {
 
 	if !objIDToDeleteNotFound {
 		if err = n.objectDelete(ctx, p.BktInfo, objIDToDelete); err != nil {
-			n.reqLogger(ctx).Error("couldn't delete cors object", zap.Error(err),
+			n.reqLogger(ctx).Error(logs.CouldntDeleteCorsObject, zap.Error(err),
 				zap.String("cnrID", p.BktInfo.CID.EncodeToString()),
 				zap.String("objID", objIDToDelete.EncodeToString()))
 		}

api/layer/layer.go

@@ -16,6 +16,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
@@ -562,7 +563,7 @@ func (n *layer) GetExtendedObjectInfo(ctx context.Context, p *HeadObjectParams)
 		return nil, err
 	}
 
-	n.reqLogger(ctx).Debug("get object",
+	n.reqLogger(ctx).Debug(logs.GetObject,
 		zap.Stringer("cid", p.BktInfo.CID),
 		zap.Stringer("oid", objInfo.ObjectInfo.ID))
 
@@ -693,7 +694,7 @@ func (n *layer) handleNotFoundError(bkt *data.BucketInfo, obj *VersionedObject)
 
 func (n *layer) handleObjectDeleteErrors(ctx context.Context, bkt *data.BucketInfo, obj *VersionedObject, nodeID uint64) *VersionedObject {
 	if client.IsErrObjectAlreadyRemoved(obj.Error) {
-		n.reqLogger(ctx).Debug("object already removed",
+		n.reqLogger(ctx).Debug(logs.ObjectAlreadyRemoved,
 			zap.Stringer("cid", bkt.CID), zap.String("oid", obj.VersionID))
 
 		obj.Error = n.treeService.RemoveVersion(ctx, bkt, nodeID)
@@ -705,7 +706,7 @@ func (n *layer) handleObjectDeleteErrors(ctx context.Context, bkt *data.BucketIn
 	}
 
 	if client.IsErrObjectNotFound(obj.Error) {
-		n.reqLogger(ctx).Debug("object not found",
+		n.reqLogger(ctx).Debug(logs.ObjectNotFound,
 			zap.Stringer("cid", bkt.CID), zap.String("oid", obj.VersionID))
 
 		obj.Error = nil
@@ -783,7 +784,7 @@ func (n *layer) ResolveBucket(ctx context.Context, name string) (cid.ID, error)
 			return cid.ID{}, err
 		}
 
-		n.reqLogger(ctx).Info("resolve bucket", zap.Stringer("cid", cnrID))
+		n.reqLogger(ctx).Info(logs.ResolveBucket, zap.Stringer("cid", cnrID))
 	}
 
 	return cnrID, nil

api/layer/multipart_upload.go

@@ -16,6 +16,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer/encryption"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
 	"github.com/minio/sio"
@@ -202,7 +203,7 @@ func (n *layer) UploadPart(ctx context.Context, p *UploadPartParams) (string, er
 func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInfo, p *UploadPartParams) (*data.ObjectInfo, error) {
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 	if err := p.Info.Encryption.MatchObjectEncryption(encInfo); err != nil {
-		n.reqLogger(ctx).Warn("mismatched obj encryptionInfo", zap.Error(err))
+		n.reqLogger(ctx).Warn(logs.MismatchedObjEncryptionInfo, zap.Error(err))
 		return nil, s3errors.GetAPIError(s3errors.ErrInvalidEncryptionParameters)
 	}
 
@@ -237,7 +238,7 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 		size = decSize
 	}
 
-	n.reqLogger(ctx).Debug("upload part",
+	n.reqLogger(ctx).Debug(logs.UploadPart,
 		zap.String("multipart upload", p.Info.UploadID), zap.Int("part number", p.PartNumber),
 		zap.Stringer("cid", bktInfo.CID), zap.Stringer("oid", id))
 
@@ -258,7 +259,7 @@ func (n *layer) uploadPart(ctx context.Context, multipartInfo *data.MultipartInf
 	}
 	if !oldPartIDNotFound {
 		if err = n.objectDelete(ctx, bktInfo, oldPartID); err != nil {
-			n.reqLogger(ctx).Error("couldn't delete old part object", zap.Error(err),
+			n.reqLogger(ctx).Error(logs.CouldntDeleteOldPartObject, zap.Error(err),
 				zap.String("cid", bktInfo.CID.EncodeToString()),
 				zap.String("oid", oldPartID.EncodeToString()))
 		}
@@ -412,7 +413,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 		CopiesNumbers: multipartInfo.CopiesNumbers,
 	})
 	if err != nil {
-		n.reqLogger(ctx).Error("could not put a completed object (multipart upload)",
+		n.reqLogger(ctx).Error(logs.CouldNotPutCompletedObject,
 			zap.String("uploadID", p.Info.UploadID),
 			zap.String("uploadKey", p.Info.Key),
 			zap.Error(err))
@@ -424,7 +425,7 @@ func (n *layer) CompleteMultipartUpload(ctx context.Context, p *CompleteMultipar
 	addr.SetContainer(p.Info.Bkt.CID)
 	for _, partInfo := range partsInfo {
 		if err = n.objectDelete(ctx, p.Info.Bkt, partInfo.OID); err != nil {
-			n.reqLogger(ctx).Warn("could not delete upload part",
+			n.reqLogger(ctx).Warn(logs.CouldNotDeleteUploadPart,
 				zap.Stringer("cid", p.Info.Bkt.CID), zap.Stringer("oid", &partInfo.OID),
 				zap.Error(err))
 		}
@@ -503,7 +504,7 @@ func (n *layer) AbortMultipartUpload(ctx context.Context, p *UploadInfoParams) e
 
 	for _, info := range parts {
 		if err = n.objectDelete(ctx, p.Bkt, info.OID); err != nil {
-			n.reqLogger(ctx).Warn("couldn't delete part", zap.String("cid", p.Bkt.CID.EncodeToString()),
+			n.reqLogger(ctx).Warn(logs.CouldntDeletePart, zap.String("cid", p.Bkt.CID.EncodeToString()),
 				zap.String("oid", info.OID.EncodeToString()), zap.Int("part number", info.Number), zap.Error(err))
 		}
 	}
@@ -520,7 +521,7 @@ func (n *layer) ListParts(ctx context.Context, p *ListPartsParams) (*ListPartsIn
 
 	encInfo := FormEncryptionInfo(multipartInfo.Meta)
 	if err = p.Info.Encryption.MatchObjectEncryption(encInfo); err != nil {
-		n.reqLogger(ctx).Warn("mismatched obj encryptionInfo", zap.Error(err))
+		n.reqLogger(ctx).Warn(logs.MismatchedObjEncryptionInfo, zap.Error(err))
 		return nil, s3errors.GetAPIError(s3errors.ErrInvalidEncryptionParameters)
 	}
 
@@ -584,7 +585,7 @@ func (n *layer) getUploadParts(ctx context.Context, p *UploadInfoParams) (*data.
 		oids[i] = part.OID.EncodeToString()
 	}
 
-	n.reqLogger(ctx).Debug("part details",
+	n.reqLogger(ctx).Debug(logs.PartDetails,
 		zap.Stringer("cid", p.Bkt.CID),
 		zap.String("upload id", p.UploadID),
 		zap.Ints("part numbers", partsNumbers),

api/layer/notifications.go

@@ -9,6 +9,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"go.uber.org/zap"
 )
 
@@ -46,7 +47,7 @@ func (n *layer) PutBucketNotificationConfiguration(ctx context.Context, p *PutBu
 
 	if !objIDToDeleteNotFound {
 		if err = n.objectDelete(ctx, p.BktInfo, objIDToDelete); err != nil {
-			n.reqLogger(ctx).Error("couldn't delete notification configuration object", zap.Error(err),
+			n.reqLogger(ctx).Error(logs.CouldntDeleteNotificationConfigurationObject, zap.Error(err),
 				zap.String("cid", p.BktInfo.CID.EncodeToString()),
 				zap.String("oid", objIDToDelete.EncodeToString()))
 		}

api/layer/object.go

@@ -19,6 +19,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	apiErrors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
@@ -291,7 +292,7 @@ func (n *layer) PutObject(ctx context.Context, p *PutObjectParams) (*data.Extend
 		return nil, err
 	}
 
-	n.reqLogger(ctx).Debug("put object", zap.Stringer("cid", p.BktInfo.CID), zap.Stringer("oid", id))
+	n.reqLogger(ctx).Debug(logs.PutObject, zap.Stringer("cid", p.BktInfo.CID), zap.Stringer("oid", id))
 
 	newVersion := &data.NodeVersion{
 		BaseNodeVersion: data.BaseNodeVersion{
@@ -468,7 +469,7 @@ func (n *layer) objectPutAndHash(ctx context.Context, prm PrmObjectCreate, bktIn
 	id, err := n.frostFS.CreateObject(ctx, prm)
 	if err != nil {
 		if _, errDiscard := io.Copy(io.Discard, prm.Payload); errDiscard != nil {
-			n.reqLogger(ctx).Warn("failed to discard put payload, probably goroutine leaks", zap.Error(errDiscard))
+			n.reqLogger(ctx).Warn(logs.FailedToDiscardPutPayloadProbablyGoroutineLeaks, zap.Error(errDiscard))
 		}
 
 		return 0, oid.ID{}, nil, err
@@ -657,7 +658,7 @@ func (n *layer) initWorkerPool(ctx context.Context, size int, p allObjectParams,
 				})
 				if err != nil {
 					wg.Done()
-					reqLog.Warn("failed to submit task to pool", zap.Error(err))
+					reqLog.Warn(logs.FailedToSubmitTaskToPool, zap.Error(err))
 				}
 			}(node)
 		}
@@ -799,7 +800,7 @@ func (n *layer) objectInfoFromObjectsCacheOrFrostFS(ctx context.Context, bktInfo
 
 	meta, err := n.objectHead(ctx, bktInfo, node.OID)
 	if err != nil {
-		n.reqLogger(ctx).Warn("could not fetch object meta", zap.Error(err))
+		n.reqLogger(ctx).Warn(logs.CouldNotFetchObjectMeta, zap.Error(err))
 		return nil
 	}
 

api/layer/tagging.go

@@ -7,6 +7,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	s3errors "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
@@ -180,7 +181,7 @@ func (n *layer) getNodeVersion(ctx context.Context, objVersion *ObjectVersion) (
 	}
 
 	if err == nil && version != nil && !version.IsDeleteMarker() {
-		n.reqLogger(ctx).Debug("get tree node",
+		n.reqLogger(ctx).Debug(logs.GetTreeNode,
 			zap.Stringer("cid", objVersion.BktInfo.CID), zap.Stringer("oid", version.OID))
 	}
 

api/middleware/auth.go

@@ -5,6 +5,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"go.uber.org/zap"
 )
 
@@ -15,9 +16,9 @@ func Auth(center auth.Center, log *zap.Logger) Func {
 			box, err := center.Authenticate(r)
 			if err != nil {
 				if err == auth.ErrNoAuthorizationHeader {
-					reqLogOrDefault(ctx, log).Debug("couldn't receive access box for gate key, random key will be used")
+					reqLogOrDefault(ctx, log).Debug(logs.CouldntReceiveAccessBoxForGateKeyRandomKeyWillBeUsed)
 				} else {
-					reqLogOrDefault(ctx, log).Error("failed to pass authentication", zap.Error(err))
+					reqLogOrDefault(ctx, log).Error(logs.FailedToPassAuthentication, zap.Error(err))
 					if _, ok := err.(errors.Error); !ok {
 						err = errors.GetAPIError(errors.ErrAccessDenied)
 					}

api/middleware/metrics.go

@@ -10,6 +10,7 @@ import (
 	"time"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	"go.uber.org/zap"
@@ -141,7 +142,7 @@ func resolveCID(log *zap.Logger, resolveBucket BucketResolveFunc) cidResolveFunc
 
 		bktInfo, err := resolveBucket(ctx, reqInfo.BucketName)
 		if err != nil {
-			reqLogOrDefault(ctx, log).Debug("failed to resolve CID", zap.Error(err))
+			reqLogOrDefault(ctx, log).Debug(logs.FailedToResolveCID, zap.Error(err))
 			return ""
 		}
 

api/middleware/reqinfo.go

@@ -9,6 +9,7 @@ import (
 	"strings"
 	"sync"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"github.com/go-chi/chi/v5"
 	"github.com/google/uuid"
 	"go.uber.org/zap"
@@ -207,7 +208,7 @@ func Request(log *zap.Logger) Func {
 			reqLogger := log.With(zap.String("request_id", reqInfo.RequestID))
 			r = r.WithContext(SetReqLogger(r.Context(), reqLogger))
 
-			reqLogger.Info("request start", zap.String("host", r.Host),
+			reqLogger.Info(logs.RequestStart, zap.String("host", r.Host),
 				zap.String("remote_host", reqInfo.RemoteHost))
 
 			// continue execution

api/middleware/response.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
 	"go.uber.org/zap"
 )
@@ -319,7 +320,7 @@ func LogSuccessResponse(l *zap.Logger) Func {
 			reqLogger := reqLogOrDefault(ctx, l)
 			reqInfo := GetReqInfo(ctx)
 
-			reqLogger.Info("request end",
+			reqLogger.Info(logs.RequestEnd,
 				zap.String("method", reqInfo.API),
 				zap.String("bucket", reqInfo.BucketName),
 				zap.String("object", reqInfo.ObjectName),

api/notifications/controller.go

@@ -9,6 +9,7 @@ import (
 
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/handler"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"github.com/nats-io/nats.go"
 	"go.uber.org/zap"
 )
@@ -168,9 +169,9 @@ func (c *Controller) Listen(ctx context.Context) {
 				select {
 				case msg := <-stream.ch:
 					if err := stream.h.HandleMessage(ctx, msg); err != nil {
-						c.logger.Error("could not handle message", zap.Error(err))
+						c.logger.Error(logs.CouldNotHandleMessage, zap.Error(err))
 					} else if err = msg.Ack(); err != nil {
-						c.logger.Error("could not ACK message", zap.Error(err))
+						c.logger.Error(logs.CouldNotACKMessage, zap.Error(err))
 					}
 				case <-ctx.Done():
 					return
@@ -187,10 +188,10 @@ func (c *Controller) SendNotifications(topics map[string]string, p *handler.Send
 		event.Records[0].S3.ConfigurationID = id
 		msg, err := json.Marshal(event)
 		if err != nil {
-			c.logger.Error("couldn't marshal an event", zap.String("subject", topic), zap.Error(err))
+			c.logger.Error(logs.CouldntMarshalAnEvent, zap.String("subject", topic), zap.Error(err))
 		}
 		if err = c.publish(topic, msg); err != nil {
-			c.logger.Error("couldn't send an event to topic", zap.String("subject", topic), zap.Error(err))
+			c.logger.Error(logs.CouldntSendAnEventToTopic, zap.String("subject", topic), zap.Error(err))
 		}
 	}
 

api/router.go

@@ -9,6 +9,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
 	s3middleware "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/metrics"
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
@@ -135,7 +136,7 @@ func errorResponseHandler(w http.ResponseWriter, r *http.Request) {
 	})
 
 	if log := s3middleware.GetReqLog(ctx); log != nil {
-		log.Error("request unmatched", zap.String("method", reqInfo.API))
+		log.Error(logs.RequestUnmatched, zap.String("method", reqInfo.API))
 	}
 }
 

authmate/authmate.go

@@ -16,6 +16,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/cache"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/accessbox"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/creds/tokens"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
 	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
 	frostfsecdsa "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/crypto/ecdsa"
@@ -168,11 +169,11 @@ type (
 
 func (a *Agent) checkContainer(ctx context.Context, opts ContainerOptions, idOwner user.ID) (cid.ID, error) {
 	if !opts.ID.Equals(cid.ID{}) {
-		a.log.Info("check container", zap.Stringer("cid", opts.ID))
+		a.log.Info(logs.CheckContainer, zap.Stringer("cid", opts.ID))
 		return opts.ID, a.frostFS.ContainerExists(ctx, opts.ID)
 	}
 
-	a.log.Info("create container",
+	a.log.Info(logs.CreateContainer,
 		zap.String("friendly_name", opts.FriendlyName),
 		zap.String("placement_policy", opts.PlacementPolicy))
 
@@ -267,7 +268,7 @@ func (a *Agent) IssueSecret(ctx context.Context, w io.Writer, options *IssueSecr
 		return fmt.Errorf("check container: %w", err)
 	}
 
-	a.log.Info("store bearer token into FrostFS",
+	a.log.Info(logs.StoreBearerTokenIntoFrostFS,
 		zap.Stringer("owner_tkn", idOwner))
 
 	creds := tokens.New(a.frostFS, secrets.EphemeralKey, cache.DefaultAccessBoxConfig(a.log))
@@ -345,7 +346,7 @@ func (a *Agent) UpdateSecret(ctx context.Context, w io.Writer, options *UpdateSe
 
 	var idOwner user.ID
 	user.IDFromKey(&idOwner, options.FrostFSKey.PrivateKey.PublicKey)
-	a.log.Info("update access cred object into FrostFS",
+	a.log.Info(logs.UpdateAccessCredObjectIntoFrostFS,
 		zap.Stringer("owner_tkn", idOwner))
 
 	oldAddr := options.Address

cmd/s3-authmate/modules/utils.go

@@ -10,6 +10,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/authmate"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/pool"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/spf13/viper"
@@ -27,7 +28,7 @@ type PoolConfig struct {
 }
 
 func createFrostFS(ctx context.Context, log *zap.Logger, cfg PoolConfig) (authmate.FrostFS, error) {
-	log.Debug("prepare connection pool")
+	log.Debug(logs.PrepareConnectionPool)
 
 	var prm pool.InitParameters
 	prm.SetKey(&cfg.Key.PrivateKey)

cmd/s3-gw/app.go

@@ -24,6 +24,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/resolver"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/services"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/version"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/wallet"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/xml"
@@ -131,7 +132,7 @@ func (a *App) initLayer(ctx context.Context) {
 	// prepare random key for anonymous requests
 	randomKey, err := keys.NewPrivateKey()
 	if err != nil {
-		a.log.Fatal("couldn't generate random key", zap.Error(err))
+		a.log.Fatal(logs.CouldntGenerateRandomKey, zap.Error(err))
 	}
 
 	var gateOwner user.ID
@@ -155,11 +156,11 @@ func (a *App) initLayer(ctx context.Context) {
 		nopts := getNotificationsOptions(a.cfg, a.log)
 		a.nc, err = notifications.NewController(nopts, a.log)
 		if err != nil {
-			a.log.Fatal("failed to enable notifications", zap.Error(err))
+			a.log.Fatal(logs.FailedToEnableNotifications, zap.Error(err))
 		}
 
 		if err = a.obj.Initialize(ctx, a.nc); err != nil {
-			a.log.Fatal("couldn't initialize layer", zap.Error(err))
+			a.log.Fatal(logs.CouldntInitializeLayer, zap.Error(err))
 		}
 	}
 }
@@ -167,7 +168,7 @@ func (a *App) initLayer(ctx context.Context) {
 func newAppSettings(log *Logger, v *viper.Viper) *appSettings {
 	policies, err := newPlacementPolicy(log.logger, v)
 	if err != nil {
-		log.logger.Fatal("failed to create new policy mapping", zap.Error(err))
+		log.logger.Fatal(logs.FailedToCreateNewPolicyMapping, zap.Error(err))
 	}
 
 	settings := &appSettings{
@@ -213,7 +214,7 @@ func (a *App) initResolver() {
 	var err error
 	a.bucketResolver, err = resolver.NewBucketResolver(a.getResolverConfig())
 	if err != nil {
-		a.log.Fatal("failed to create resolver", zap.Error(err))
+		a.log.Fatal(logs.FailedToCreateResolver, zap.Error(err))
 	}
 }
 
@@ -226,11 +227,11 @@ func (a *App) getResolverConfig() ([]string, *resolver.Config) {
 	order := a.cfg.GetStringSlice(cfgResolveOrder)
 	if resolveCfg.RPCAddress == "" {
 		order = remove(order, resolver.NNSResolver)
-		a.log.Warn(fmt.Sprintf("resolver '%s' won't be used since '%s' isn't provided", resolver.NNSResolver, cfgRPCEndpoint))
+		a.log.Warn(logs.ResolverNNSWontBeUsedSinceRPCEndpointIsntProvided)
 	}
 
 	if len(order) == 0 {
-		a.log.Info("container resolver will be disabled because of resolvers 'resolver_order' is empty")
+		a.log.Info(logs.ContainerResolverWillBeDisabled)
 	}
 
 	return order, resolveCfg
@@ -251,10 +252,10 @@ func (a *App) initTracing(ctx context.Context) {
 	}
 	updated, err := tracing.Setup(ctx, cfg)
 	if err != nil {
-		a.log.Warn("failed to initialize tracing", zap.Error(err))
+		a.log.Warn(logs.FailedToInitializeTracing, zap.Error(err))
 	}
 	if updated {
-		a.log.Info("tracing config updated")
+		a.log.Info(logs.TracingConfigUpdated)
 	}
 }
 
@@ -264,7 +265,7 @@ func (a *App) shutdownTracing() {
 	defer cancel()
 
 	if err := tracing.Shutdown(shdnCtx); err != nil {
-		a.log.Warn("failed to shutdown tracing", zap.Error(err))
+		a.log.Warn(logs.FailedToShutdownTracing, zap.Error(err))
 	}
 }
 
@@ -285,12 +286,12 @@ func getPools(ctx context.Context, logger *zap.Logger, cfg *viper.Viper) (*pool.
 	password := wallet.GetPassword(cfg, cfgWalletPassphrase)
 	key, err := wallet.GetKeyFromPath(cfg.GetString(cfgWalletPath), cfg.GetString(cfgWalletAddress), password)
 	if err != nil {
-		logger.Fatal("could not load FrostFS private key", zap.Error(err))
+		logger.Fatal(logs.CouldNotLoadFrostFSPrivateKey, zap.Error(err))
 	}
 
 	prm.SetKey(&key.PrivateKey)
 	prmTree.SetKey(key)
-	logger.Info("using credentials", zap.String("FrostFS", hex.EncodeToString(key.PublicKey().Bytes())))
+	logger.Info(logs.UsingCredentials, zap.String("FrostFS", hex.EncodeToString(key.PublicKey().Bytes())))
 
 	for _, peer := range fetchPeers(logger, cfg) {
 		prm.AddNode(peer)
@@ -333,19 +334,19 @@ func getPools(ctx context.Context, logger *zap.Logger, cfg *viper.Viper) (*pool.
 
 	p, err := pool.NewPool(prm)
 	if err != nil {
-		logger.Fatal("failed to create connection pool", zap.Error(err))
+		logger.Fatal(logs.FailedToCreateConnectionPool, zap.Error(err))
 	}
 
 	if err = p.Dial(ctx); err != nil {
-		logger.Fatal("failed to dial connection pool", zap.Error(err))
+		logger.Fatal(logs.FailedToDialConnectionPool, zap.Error(err))
 	}
 
 	treePool, err := treepool.NewPool(prmTree)
 	if err != nil {
-		logger.Fatal("failed to create tree pool", zap.Error(err))
+		logger.Fatal(logs.FailedToCreateTreePool, zap.Error(err))
 	}
 	if err = treePool.Dial(ctx); err != nil {
-		logger.Fatal("failed to dial tree pool", zap.Error(err))
+		logger.Fatal(logs.FailedToDialTreePool, zap.Error(err))
 	}
 
 	return p, treePool, key
@@ -393,7 +394,7 @@ func (p *placementPolicy) DefaultCopiesNumbers() []uint32 {
 
 func (p *placementPolicy) update(l *zap.Logger, v *viper.Viper) {
 	if err := p.updatePolicy(v); err != nil {
-		l.Warn("policies won't be updated", zap.Error(err))
+		l.Warn(logs.PoliciesWontBeUpdated, zap.Error(err))
 	}
 
 	p.updateCopiesNumbers(l, v)
@@ -421,7 +422,7 @@ func (p *placementPolicy) updatePolicy(v *viper.Viper) error {
 
 func (p *placementPolicy) updateCopiesNumbers(l *zap.Logger, v *viper.Viper) {
 	if newCopiesNumbers, err := fetchCopiesNumbers(l, v); err != nil {
-		l.Warn("copies numbers won't be updated", zap.Error(err))
+		l.Warn(logs.CopiesNumbersWontBeUpdated, zap.Error(err))
 	} else {
 		p.mu.Lock()
 		p.copiesNumbers = newCopiesNumbers
@@ -436,12 +437,12 @@ func (p *placementPolicy) updateDefaultCopiesNumbers(l *zap.Logger, v *viper.Vip
 		p.mu.Lock()
 		p.defaultCopiesNumbers = configuredValues
 		p.mu.Unlock()
-		l.Info("default copies numbers", zap.Uint32s("vector", p.defaultCopiesNumbers))
+		l.Info(logs.DefaultCopiesNumbers, zap.Uint32s("vector", p.defaultCopiesNumbers))
 		return
 	}
 
-	l.Error("cannot parse default copies numbers", zap.Error(err))
+	l.Error(logs.CannotParseDefaultCopiesNumbers, zap.Error(err))
-	l.Warn("default copies numbers won't be updated", zap.Uint32s("current value", p.DefaultCopiesNumbers()))
+	l.Warn(logs.DefaultCopiesNumbersWontBeUpdated, zap.Uint32s("current value", p.DefaultCopiesNumbers()))
 }
 
 func remove(list []string, element string) []string {
@@ -459,7 +460,7 @@ func remove(list []string, element string) []string {
 // version (version.Version) and its name (frostfs-s3-gw). At the end, it writes
 // about the stop to the log.
 func (a *App) Wait() {
-	a.log.Info("application started",
+	a.log.Info(logs.ApplicationStarted,
 		zap.String("name", "frostfs-s3-gw"),
 		zap.String("version", version.Version),
 	)
@@ -469,7 +470,7 @@ func (a *App) Wait() {
 
 	<-a.webDone // wait for web-server to be stopped
 
-	a.log.Info("application finished")
+	a.log.Info(logs.ApplicationFinished)
 }
 
 func (a *App) setHealthStatus() {
@@ -480,7 +481,7 @@ func (a *App) setHealthStatus() {
 func (a *App) Serve(ctx context.Context) {
 	// Attach S3 API:
 	domains := a.cfg.GetStringSlice(cfgListenDomains)
-	a.log.Info("fetch domains, prepare to use API", zap.Strings("domains", domains))
+	a.log.Info(logs.FetchDomainsPrepareToUseAPI, zap.Strings("domains", domains))
 
 	throttleOps := middleware.ThrottleOpts{
 		Limit:          a.settings.maxClient.count,
@@ -499,10 +500,10 @@ func (a *App) Serve(ctx context.Context) {
 
 	for i := range a.servers {
 		go func(i int) {
-			a.log.Info("starting server", zap.String("address", a.servers[i].Address()))
+			a.log.Info(logs.StartingServer, zap.String("address", a.servers[i].Address()))
 
 			if err := srv.Serve(a.servers[i].Listener()); err != nil && err != http.ErrServerClosed {
-				a.log.Fatal("listen and serve", zap.Error(err))
+				a.log.Fatal(logs.ListenAndServe, zap.Error(err))
 			}
 		}(i)
 	}
@@ -523,7 +524,7 @@ LOOP:
 	ctx, cancel := shutdownContext()
 	defer cancel()
 
-	a.log.Info("stopping server", zap.Error(srv.Shutdown(ctx)))
+	a.log.Info(logs.StoppingServer, zap.Error(srv.Shutdown(ctx)))
 
 	a.metrics.Shutdown()
 	a.stopServices()
@@ -537,23 +538,23 @@ func shutdownContext() (context.Context, context.CancelFunc) {
 }
 
 func (a *App) configReload(ctx context.Context) {
-	a.log.Info("SIGHUP config reload started")
+	a.log.Info(logs.SIGHUPConfigReloadStarted)
 
 	if !a.cfg.IsSet(cmdConfig) && !a.cfg.IsSet(cmdConfigDir) {
-		a.log.Warn("failed to reload config because it's missed")
+		a.log.Warn(logs.FailedToReloadConfigBecauseItsMissed)
 		return
 	}
 	if err := readInConfig(a.cfg); err != nil {
-		a.log.Warn("failed to reload config", zap.Error(err))
+		a.log.Warn(logs.FailedToReloadConfig, zap.Error(err))
 		return
 	}
 
 	if err := a.bucketResolver.UpdateResolvers(a.getResolverConfig()); err != nil {
-		a.log.Warn("failed to reload resolvers", zap.Error(err))
+		a.log.Warn(logs.FailedToReloadResolvers, zap.Error(err))
 	}
 
 	if err := a.updateServers(); err != nil {
-		a.log.Warn("failed to reload server parameters", zap.Error(err))
+		a.log.Warn(logs.FailedToReloadServerParameters, zap.Error(err))
 	}
 
 	a.stopServices()
@@ -565,12 +566,12 @@ func (a *App) configReload(ctx context.Context) {
 	a.initTracing(ctx)
 	a.setHealthStatus()
 
-	a.log.Info("SIGHUP config reload completed")
+	a.log.Info(logs.SIGHUPConfigReloadCompleted)
 }
 
 func (a *App) updateSettings() {
 	if lvl, err := getLogLevel(a.cfg); err != nil {
-		a.log.Warn("log level won't be updated", zap.Error(err))
+		a.log.Warn(logs.LogLevelWontBeUpdated, zap.Error(err))
 	} else {
 		a.settings.logLevel.SetLevel(lvl)
 	}
@@ -605,16 +606,16 @@ func (a *App) initServers(ctx context.Context) {
 		}
 		srv, err := newServer(ctx, serverInfo)
 		if err != nil {
-			a.log.Warn("failed to add server", append(fields, zap.Error(err))...)
+			a.log.Warn(logs.FailedToAddServer, append(fields, zap.Error(err))...)
 			continue
 		}
 
 		a.servers = append(a.servers, srv)
-		a.log.Info("add server", fields...)
+		a.log.Info(logs.AddServer, fields...)
 	}
 
 	if len(a.servers) == 0 {
-		a.log.Fatal("no healthy servers")
+		a.log.Fatal(logs.NoHealthyServers)
 	}
 }
 
@@ -725,7 +726,7 @@ func (a *App) initHandler() {
 	var err error
 	a.api, err = handler.New(a.log, a.obj, a.nc, cfg)
 	if err != nil {
-		a.log.Fatal("could not initialize API handler", zap.Error(err))
+		a.log.Fatal(logs.CouldNotInitializeAPIHandler, zap.Error(err))
 	}
 }
 

cmd/s3-gw/app_settings.go

@@ -13,6 +13,7 @@ import (
 	"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/logs"
 	"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"
@@ -241,7 +242,7 @@ func fetchDefaultPolicy(cfg *viper.Viper) (netmap.PlacementPolicy, error) {
 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)",
+		l.Error(logs.InvalidLifetimeUsingDefaultValue,
 			zap.String("parameter", cfgNATSTimeout),
 			zap.Duration("value in config", timeout),
 			zap.Duration("default", notifications.DefaultTimeout))
@@ -255,7 +256,7 @@ func fetchCacheLifetime(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultV
 	if v.IsSet(cfgEntry) {
 		lifetime := v.GetDuration(cfgEntry)
 		if lifetime <= 0 {
-			l.Error("invalid lifetime, using default value (in seconds)",
+			l.Error(logs.InvalidLifetimeUsingDefaultValue,
 				zap.String("parameter", cfgEntry),
 				zap.Duration("value in config", lifetime),
 				zap.Duration("default", defaultValue))
@@ -271,7 +272,7 @@ func fetchCacheSize(v *viper.Viper, l *zap.Logger, cfgEntry string, defaultValue
 	if v.IsSet(cfgEntry) {
 		size := v.GetInt(cfgEntry)
 		if size <= 0 {
-			l.Error("invalid cache size, using default value",
+			l.Error(logs.InvalidCacheSizeUsingDefaultValue,
 				zap.String("parameter", cfgEntry),
 				zap.Int("value in config", size),
 				zap.Int("default", defaultValue))
@@ -290,7 +291,7 @@ func fetchDefaultMaxAge(cfg *viper.Viper, l *zap.Logger) int {
 		defaultMaxAge = cfg.GetInt(cfgDefaultMaxAge)
 
 		if defaultMaxAge <= 0 && defaultMaxAge != -1 {
-			l.Fatal("invalid defaultMaxAge",
+			l.Fatal(logs.InvalidDefaultMaxAge,
 				zap.String("parameter", cfgDefaultMaxAge),
 				zap.String("value in config", strconv.Itoa(defaultMaxAge)))
 		}
@@ -360,7 +361,7 @@ func fetchCopiesNumbers(l *zap.Logger, v *viper.Viper) (map[string][]uint32, err
 		}
 
 		copiesNums[constraint] = vector32
-		l.Info("constraint added", zap.String("location", constraint), zap.Strings("copies numbers", vector))
+		l.Info(logs.ConstraintAdded, zap.String("location", constraint), zap.Strings("copies numbers", vector))
 	}
 	return copiesNums, nil
 }
@@ -374,7 +375,7 @@ func fetchPeers(l *zap.Logger, v *viper.Viper) []pool.NodeParam {
 		priority := v.GetInt(key + "priority")
 
 		if address == "" {
-			l.Warn("skip, empty address")
+			l.Warn(logs.SkipEmptyAddress)
 			break
 		}
 		if weight <= 0 { // unspecified or wrong
@@ -386,7 +387,7 @@ func fetchPeers(l *zap.Logger, v *viper.Viper) []pool.NodeParam {
 
 		nodes = append(nodes, pool.NewNodeParam(priority, address, weight))
 
-		l.Info("added storage peer",
+		l.Info(logs.AddedStoragePeer,
 			zap.Int("priority", priority),
 			zap.String("address", address),
 			zap.Float64("weight", weight))

cmd/s3-gw/service.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"net/http"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	"go.uber.org/zap"
 )
 
@@ -18,21 +19,21 @@ type Service struct {
 // Start runs http service with the exposed endpoint on the configured port.
 func (ms *Service) Start() {
 	if ms.enabled {
-		ms.log.Info("service is running", zap.String("endpoint", ms.Addr))
+		ms.log.Info(logs.ServiceIsRunning, zap.String("endpoint", ms.Addr))
 		err := ms.ListenAndServe()
 		if err != nil && err != http.ErrServerClosed {
-			ms.log.Warn("service couldn't start on configured port")
+			ms.log.Warn(logs.ServiceCouldntStartOnConfiguredPort)
 		}
 	} else {
-		ms.log.Info("service hasn't started since it's disabled")
+		ms.log.Info(logs.ServiceHasntStartedSinceItsDisabled)
 	}
 }
 
 // ShutDown stops the service.
 func (ms *Service) ShutDown(ctx context.Context) {
-	ms.log.Info("shutting down service", zap.String("endpoint", ms.Addr))
+	ms.log.Info(logs.ShuttingDownService, zap.String("endpoint", ms.Addr))
 	err := ms.Shutdown(ctx)
 	if err != nil {
-		ms.log.Panic("can't shut down service")
+		ms.log.Panic(logs.CantShutDownService)
 	}
 }

internal/logs/logs.go

@@ -0,0 +1,114 @@
+package logs
+
+const (
+	RequestUnmatched                                     = "request unmatched"                                                                  // Error in ../../api/router.go
+	CheckContainer                                       = "check container"                                                                    // Info in ../../authmate/authmate.go
+	CreateContainer                                      = "create container"                                                                   // Info in ../../authmate/authmate.go
+	StoreBearerTokenIntoFrostFS                          = "store bearer token into FrostFS"                                                    // Info in ../../authmate/authmate.go
+	UpdateAccessCredObjectIntoFrostFS                    = "update access cred object into FrostFS"                                             // Info in ../../authmate/authmate.go
+	MetricsAreDisabled                                   = "metrics are disabled"                                                               // Warn in ../../metrics/app.go
+	FoundMoreThanOneUnversionedNode                      = "found more than one unversioned node"                                               // Debug in ../../pkg/service/tree/tree.go
+	ServiceIsRunning                                     = "service is running"                                                                 // Info in ../../cmd/s3-gw/service.go
+	ServiceCouldntStartOnConfiguredPort                  = "service couldn't start on configured port"                                          // Warn in ../../cmd/s3-gw/service.go
+	ServiceHasntStartedSinceItsDisabled                  = "service hasn't started since it's disabled"                                         // Info in ../../cmd/s3-gw/service.go
+	ShuttingDownService                                  = "shutting down service"                                                              // Info in ../../cmd/s3-gw/service.go
+	ContainerResolverWillBeDisabled                      = "container resolver will be disabled because of resolvers 'resolver_order' is empty" // Info in ../../cmd/s3-gw/app.go
+	FailedToInitializeTracing                            = "failed to initialize tracing"                                                       // Warn in ../../cmd/s3-gw/app.go
+	TracingConfigUpdated                                 = "tracing config updated"                                                             // Info in ../../cmd/s3-gw/app.go
+	FailedToShutdownTracing                              = "failed to shutdown tracing"                                                         // Warn in ../../cmd/s3-gw/app.go
+	UsingCredentials                                     = "using credentials"                                                                  // Info in ../../cmd/s3-gw/app.go
+	PoliciesWontBeUpdated                                = "policies won't be updated"                                                          // Warn in ../../cmd/s3-gw/app.go
+	CopiesNumbersWontBeUpdated                           = "copies numbers won't be updated"                                                    // Warn in ../../cmd/s3-gw/app.go
+	DefaultCopiesNumbers                                 = "default copies numbers"                                                             // Info in ../../cmd/s3-gw/app.go
+	CannotParseDefaultCopiesNumbers                      = "cannot parse default copies numbers"                                                // Error in ../../cmd/s3-gw/app.go
+	DefaultCopiesNumbersWontBeUpdated                    = "default copies numbers won't be updated"                                            // Warn in ../../cmd/s3-gw/app.go
+	ApplicationStarted                                   = "application started"                                                                // Info in ../../cmd/s3-gw/app.go
+	ApplicationFinished                                  = "application finished"                                                               // Info in ../../cmd/s3-gw/app.go
+	FetchDomainsPrepareToUseAPI                          = "fetch domains, prepare to use API"                                                  // Info in ../../cmd/s3-gw/app.go
+	StartingServer                                       = "starting server"                                                                    // Info in ../../cmd/s3-gw/app.go
+	StoppingServer                                       = "stopping server"                                                                    // Info in ../../cmd/s3-gw/app.go
+	SIGHUPConfigReloadStarted                            = "SIGHUP config reload started"                                                       // Info in ../../cmd/s3-gw/app.go
+	FailedToReloadConfigBecauseItsMissed                 = "failed to reload config because it's missed"                                        // Warn in ../../cmd/s3-gw/app.go
+	FailedToReloadConfig                                 = "failed to reload config"                                                            // Warn in ../../cmd/s3-gw/app.go
+	FailedToReloadResolvers                              = "failed to reload resolvers"                                                         // Warn in ../../cmd/s3-gw/app.go
+	FailedToReloadServerParameters                       = "failed to reload server parameters"                                                 // Warn in ../../cmd/s3-gw/app.go
+	SIGHUPConfigReloadCompleted                          = "SIGHUP config reload completed"                                                     // Info in ../../cmd/s3-gw/app.go
+	LogLevelWontBeUpdated                                = "log level won't be updated"                                                         // Warn in ../../cmd/s3-gw/app.go
+	FailedToAddServer                                    = "failed to add server"                                                               // Warn in ../../cmd/s3-gw/app.go
+	AddServer                                            = "add server"                                                                         // Info in ../../cmd/s3-gw/app.go
+	ResolverNNSWontBeUsedSinceRPCEndpointIsntProvided    = "resolver 'nns' won't be used since 'rpc_endpoint' isn't provided"                   // Warn in ../../cmd/s3-gw/app.go
+	InvalidLifetimeUsingDefaultValue                     = "invalid lifetime, using default value (in seconds)"                                 // Error in ../../cmd/s3-gw/app_settings.go
+	InvalidCacheSizeUsingDefaultValue                    = "invalid cache size, using default value"                                            // Error in ../../cmd/s3-gw/app_settings.go
+	ConstraintAdded                                      = "constraint added"                                                                   // Info in ../../cmd/s3-gw/app_settings.go
+	SkipEmptyAddress                                     = "skip, empty address"                                                                // Warn in ../../cmd/s3-gw/app_settings.go
+	AddedStoragePeer                                     = "added storage peer"                                                                 // Info in ../../cmd/s3-gw/app_settings.go
+	PrepareConnectionPool                                = "prepare connection pool"                                                            // Debug in ../../cmd/s3-authmate/modules/utils.go
+	InvalidCacheEntryType                                = "invalid cache entry type"                                                           // Warn in ../../api/cache/*
+	InvalidCacheKeyType                                  = "invalid cache key type"                                                             // Warn in ../../api/cache/objectslist.go
+	ObjectIsCopied                                       = "object is copied"                                                                   // Info in ../../api/handler/copy.go
+	CouldntSendNotification                              = "couldn't send notification: %w"                                                     // Error in ../../api/handler/*
+	FailedToSendTestEventBecauseNotificationsIsDisabled  = "failed to send test event because notifications is disabled"                        // Warn in ../../api/handler/notifications.go
+	RequestFailed                                        = "request failed"                                                                     // Error in ../../api/handler/util.go
+	GetBucketInfo                                        = "get bucket info"                                                                    // Warn in ../../api/handler/cors.go
+	GetBucketCors                                        = "get bucket cors"                                                                    // Warn in ../../api/handler/cors.go
+	SomeACLNotFullyMapped                                = "some acl not fully mapped"                                                          // Warn in ../../api/handler/acl.go
+	CouldntDeleteObjects                                 = "couldn't delete objects"                                                            // Error in ../../api/handler/delete.go
+	NotificatorIsDisabledS3WontProduceNotificationEvents = "notificator is disabled, s3 won't produce notification events"                      // Warn in ../../api/handler/api.go
+	CouldntGetBucketVersioning                           = "couldn't get bucket versioning"                                                     // Warn in ../../api/handler/put.go
+	BucketIsCreated                                      = "bucket is created"                                                                  // Info in ../../api/handler/put.go
+	CouldntDeleteNotificationConfigurationObject         = "couldn't delete notification configuration object"                                  // Error in ../../api/layer/notifications.go
+	CouldNotParseContainerObjectLockEnabledAttribute     = "could not parse container object lock enabled attribute"                            // Error in ../../api/layer/container.go
+	CouldNotListUserContainers                           = "could not list user containers"                                                     // Error in ../../api/layer/container.go
+	CouldNotFetchContainerInfo                           = "could not fetch container info"                                                     // Error in ../../api/layer/container.go
+	MismatchedObjEncryptionInfo                          = "mismatched obj encryptionInfo"                                                      // Warn in ../../api/layer/multipart_upload.go
+	UploadPart                                           = "upload part"                                                                        // Debug in ../../api/layer/multipart_upload.go
+	CouldntDeleteOldPartObject                           = "couldn't delete old part object"                                                    // Error in ../../api/layer/multipart_upload.go
+	CouldNotPutCompletedObject                           = "could not put a completed object (multipart upload)"                                // Error in ../../api/layer/multipart_upload.go
+	CouldNotDeleteUploadPart                             = "could not delete upload part"                                                       // Warn in ../../api/layer/multipart_upload.go
+	CouldntDeletePart                                    = "couldn't delete part"                                                               // Warn in ../../api/layer/multipart_upload.go
+	PartDetails                                          = "part details"                                                                       // Debug in ../../api/layer/multipart_upload.go
+	GetObject                                            = "get object"                                                                         // Debug in ../../api/layer/layer.go
+	ObjectAlreadyRemoved                                 = "object already removed"                                                             // Debug in ../../api/layer/layer.go
+	ObjectNotFound                                       = "object not found"                                                                   // Debug in ../../api/layer/layer.go
+	ResolveBucket                                        = "resolve bucket"                                                                     // Info in ../../api/layer/layer.go
+	CouldntDeleteCorsObject                              = "couldn't delete cors object"                                                        // Error in ../../api/layer/cors.go
+	PutObject                                            = "put object"                                                                         // Debug in ../../api/layer/object.go
+	FailedToDiscardPutPayloadProbablyGoroutineLeaks      = "failed to discard put payload, probably goroutine leaks"                            // Warn in ../../api/layer/object.go
+	FailedToSubmitTaskToPool                             = "failed to submit task to pool"                                                      // Warn in ../../api/layer/object.go
+	CouldNotFetchObjectMeta                              = "could not fetch object meta"                                                        // Warn in ../../api/layer/object.go
+	GetTreeNode                                          = "get tree node"                                                                      // Debug in ../../api/layer/tagging.go
+	CouldntPutBucketInfoIntoCache                        = "couldn't put bucket info into cache"                                                // Warn in ../../api/layer/cache.go
+	CouldntAddObjectToCache                              = "couldn't add object to cache"                                                       // Warn in ../../api/layer/cache.go
+	CouldntCacheAccessControlOperation                   = "couldn't cache access control operation"                                            // Warn in ../../api/layer/cache.go
+	CouldntPutObjAddressToNameCache                      = "couldn't put obj address to name cache"                                             // Warn in ../../api/layer/cache.go
+	CouldntCacheListOfObjects                            = "couldn't cache list of objects"                                                     // Warn in ../../api/layer/cache.go
+	CouldntCacheTags                                     = "couldn't cache tags"                                                                // Error in ../../api/layer/cache.go
+	CouldntCacheLockInfo                                 = "couldn't cache lock info"                                                           // Error in ../../api/layer/cache.go
+	CouldntCacheBucketSettings                           = "couldn't cache bucket settings"                                                     // Warn in ../../api/layer/cache.go
+	CouldntCacheCors                                     = "couldn't cache cors"                                                                // Warn in ../../api/layer/cache.go
+	CouldntCacheNotificationConfiguration                = "couldn't cache notification configuration"                                          // Warn in ../../api/layer/cache.go
+	RequestEnd                                           = "request end"                                                                        // Info in ../../api/middleware/response.go
+	CouldntReceiveAccessBoxForGateKeyRandomKeyWillBeUsed = "couldn't receive access box for gate key, random key will be used"                  // Debug in ../../api/middleware/auth.go
+	FailedToPassAuthentication                           = "failed to pass authentication"                                                      // Error in ../../api/middleware/auth.go
+	FailedToResolveCID                                   = "failed to resolve CID"                                                              // Debug in ../../api/middleware/metrics.go
+	RequestStart                                         = "request start"                                                                      // Info in ../../api/middleware/reqinfo.go
+	CouldNotHandleMessage                                = "could not handle message"                                                           // Error in ../../api/notifications/controller.go
+	CouldNotACKMessage                                   = "could not ACK message"                                                              // Error in ../../api/notifications/controller.go
+	CouldntMarshalAnEvent                                = "couldn't marshal an event"                                                          // Error in ../../api/notifications/controller.go
+	CouldntSendAnEventToTopic                            = "couldn't send an event to topic"                                                    // Error in ../../api/notifications/controller.go
+	InvalidDefaultMaxAge                                 = "invalid defaultMaxAge"                                                              // Fatal in ../../cmd/s3-gw/app_settings.go
+	CantShutDownService                                  = "can't shut down service"                                                            // Panic in ../../cmd/s3-gw/service.go
+	CouldntGenerateRandomKey                             = "couldn't generate random key"                                                       // Fatal in ../../cmd/s3-gw/app.go
+	FailedToEnableNotifications                          = "failed to enable notifications"                                                     // Fatal in ../../cmd/s3-gw/app.go
+	CouldntInitializeLayer                               = "couldn't initialize layer"                                                          // Fatal in ../../cmd/s3-gw/app.go
+	FailedToCreateNewPolicyMapping                       = "failed to create new policy mapping"                                                // Fatal in ../../cmd/s3-gw/app.go
+	FailedToCreateResolver                               = "failed to create resolver"                                                          // Fatal in ../../cmd/s3-gw/app.go
+	CouldNotLoadFrostFSPrivateKey                        = "could not load FrostFS private key"                                                 // Fatal in ../../cmd/s3-gw/app.go
+	FailedToCreateConnectionPool                         = "failed to create connection pool"                                                   // Fatal in ../../cmd/s3-gw/app.go
+	FailedToDialConnectionPool                           = "failed to dial connection pool"                                                     // Fatal in ../../cmd/s3-gw/app.go
+	FailedToCreateTreePool                               = "failed to create tree pool"                                                         // Fatal in ../../cmd/s3-gw/app.go
+	FailedToDialTreePool                                 = "failed to dial tree pool"                                                           // Fatal in ../../cmd/s3-gw/app.go
+	ListenAndServe                                       = "listen and serve"                                                                   // Fatal in ../../cmd/s3-gw/app.go
+	NoHealthyServers                                     = "no healthy servers"                                                                 // Fatal in ../../cmd/s3-gw/app.go
+	CouldNotInitializeAPIHandler                         = "could not initialize API handler"                                                   // Fatal in ../../cmd/s3-gw/app.go
+)

metrics/app.go

@@ -4,6 +4,7 @@ import (
 	"net/http"
 	"sync"
 
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	dto "github.com/prometheus/client_model/go"
 	"go.uber.org/zap"
 )
@@ -17,7 +18,7 @@ type AppMetrics struct {
 
 func NewAppMetrics(logger *zap.Logger, poolStatistics StatisticScraper, enabled bool) *AppMetrics {
 	if !enabled {
-		logger.Warn("metrics are disabled")
+		logger.Warn(logs.MetricsAreDisabled)
 	}
 	return &AppMetrics{
 		logger:  logger,
@@ -28,7 +29,7 @@ func NewAppMetrics(logger *zap.Logger, poolStatistics StatisticScraper, enabled
 
 func (m *AppMetrics) SetEnabled(enabled bool) {
 	if !enabled {
-		m.logger.Warn("metrics are disabled")
+		m.logger.Warn(logs.MetricsAreDisabled)
 	}
 
 	m.mu.Lock()

pkg/service/tree/tree.go

@@ -12,6 +12,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/data"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
 	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/middleware"
+	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
 	oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
 	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/user"
 	"go.uber.org/zap"
@@ -829,7 +830,7 @@ func (c *Tree) getUnversioned(ctx context.Context, bktInfo *data.BucketInfo, tre
 	}
 
 	if len(nodes) > 1 {
-		c.reqLogger(ctx).Debug("found more than one unversioned node",
+		c.reqLogger(ctx).Debug(logs.FoundMoreThanOneUnversionedNode,
 			zap.String("treeID", treeID), zap.String("filepath", filepath))
 	}