mirror of
https://github.com/minio/minio.git
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940 lines
23 KiB
Go
940 lines
23 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package cmd
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import (
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"bytes"
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"context"
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"errors"
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"os"
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"path"
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"sort"
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"strings"
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"github.com/minio/minio/internal/logger"
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"github.com/minio/pkg/console"
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)
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// metaCacheEntry is an object or a directory within an unknown bucket.
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type metaCacheEntry struct {
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// name is the full name of the object including prefixes
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name string
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// Metadata. If none is present it is not an object but only a prefix.
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// Entries without metadata will only be present in non-recursive scans.
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metadata []byte
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// cached contains the metadata if decoded.
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cached *xlMetaV2
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// Indicates the entry can be reused and only one reference to metadata is expected.
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reusable bool
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}
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// isDir returns if the entry is representing a prefix directory.
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func (e metaCacheEntry) isDir() bool {
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return len(e.metadata) == 0 && strings.HasSuffix(e.name, slashSeparator)
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}
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// isObject returns if the entry is representing an object.
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func (e metaCacheEntry) isObject() bool {
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return len(e.metadata) > 0
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}
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// isObjectDir returns if the entry is representing an object__XL_DIR__
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func (e metaCacheEntry) isObjectDir() bool {
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return len(e.metadata) > 0 && strings.HasSuffix(e.name, slashSeparator)
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}
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// hasPrefix returns whether an entry has a specific prefix
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func (e metaCacheEntry) hasPrefix(s string) bool {
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return strings.HasPrefix(e.name, s)
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}
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// matches returns if the entries have the same versions.
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// If strict is false we allow signatures to mismatch.
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func (e *metaCacheEntry) matches(other *metaCacheEntry, strict bool) (prefer *metaCacheEntry, matches bool) {
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if e == nil && other == nil {
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return nil, true
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}
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if e == nil {
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return other, false
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}
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if other == nil {
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return e, false
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}
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// Name should match...
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if e.name != other.name {
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if e.name < other.name {
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return e, false
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}
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return other, false
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}
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if other.isDir() || e.isDir() {
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if e.isDir() {
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return e, other.isDir() == e.isDir()
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}
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return other, other.isDir() == e.isDir()
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}
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eVers, eErr := e.xlmeta()
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oVers, oErr := other.xlmeta()
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if eErr != nil || oErr != nil {
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return nil, false
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}
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// check both fileInfo's have same number of versions, if not skip
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// the `other` entry.
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if len(eVers.versions) != len(oVers.versions) {
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eTime := eVers.latestModtime()
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oTime := oVers.latestModtime()
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if !eTime.Equal(oTime) {
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if eTime.After(oTime) {
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return e, false
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}
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return other, false
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}
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// Tiebreak on version count.
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if len(eVers.versions) > len(oVers.versions) {
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return e, false
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}
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return other, false
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}
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// Check if each version matches...
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for i, eVer := range eVers.versions {
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oVer := oVers.versions[i]
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if eVer.header != oVer.header {
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if !strict && eVer.header.matchesNotStrict(oVer.header) {
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if prefer == nil {
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if eVer.header.sortsBefore(oVer.header) {
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prefer = e
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} else {
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prefer = other
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}
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}
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continue
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}
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if prefer != nil {
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return prefer, false
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}
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if eVer.header.sortsBefore(oVer.header) {
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return e, false
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}
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return other, false
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}
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}
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// If we match, return e
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if prefer == nil {
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prefer = e
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}
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return prefer, true
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}
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// isInDir returns whether the entry is in the dir when considering the separator.
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func (e metaCacheEntry) isInDir(dir, separator string) bool {
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if len(dir) == 0 {
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// Root
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idx := strings.Index(e.name, separator)
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return idx == -1 || idx == len(e.name)-len(separator)
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}
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ext := strings.TrimPrefix(e.name, dir)
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if len(ext) != len(e.name) {
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idx := strings.Index(ext, separator)
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// If separator is not found or is last entry, ok.
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return idx == -1 || idx == len(ext)-len(separator)
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}
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return false
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}
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// isLatestDeletemarker returns whether the latest version is a delete marker.
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// If metadata is NOT versioned false will always be returned.
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// If v2 and UNABLE to load metadata true will be returned.
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func (e *metaCacheEntry) isLatestDeletemarker() bool {
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if e.cached != nil {
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if len(e.cached.versions) == 0 {
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return true
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}
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return e.cached.versions[0].header.Type == DeleteType
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}
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if !isXL2V1Format(e.metadata) {
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return false
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}
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if meta, _, err := isIndexedMetaV2(e.metadata); meta != nil {
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return meta.IsLatestDeleteMarker()
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} else if err != nil {
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return true
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}
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// Fall back...
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xlMeta, err := e.xlmeta()
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if err != nil || len(xlMeta.versions) == 0 {
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return true
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}
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return xlMeta.versions[0].header.Type == DeleteType
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}
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// isAllFreeVersions returns if all objects are free versions.
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// If metadata is NOT versioned false will always be returned.
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// If v2 and UNABLE to load metadata true will be returned.
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func (e *metaCacheEntry) isAllFreeVersions() bool {
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if e.cached != nil {
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if len(e.cached.versions) == 0 {
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return true
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}
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for _, v := range e.cached.versions {
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if !v.header.FreeVersion() {
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return false
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}
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}
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return true
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}
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if !isXL2V1Format(e.metadata) {
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return false
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}
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if meta, _, err := isIndexedMetaV2(e.metadata); meta != nil {
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return meta.AllHidden(false)
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} else if err != nil {
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return true
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}
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// Fall back...
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xlMeta, err := e.xlmeta()
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if err != nil || len(xlMeta.versions) == 0 {
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return true
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}
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// Check versions..
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for _, v := range e.cached.versions {
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if !v.header.FreeVersion() {
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return false
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}
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}
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return true
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}
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// fileInfo returns the decoded metadata.
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// If entry is a directory it is returned as that.
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// If versioned the latest version will be returned.
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func (e *metaCacheEntry) fileInfo(bucket string) (FileInfo, error) {
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if e.isDir() {
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return FileInfo{
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Volume: bucket,
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Name: e.name,
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Mode: uint32(os.ModeDir),
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}, nil
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}
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if e.cached != nil {
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if len(e.cached.versions) == 0 {
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// This special case is needed to handle xlMeta.versions == 0
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return FileInfo{
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Volume: bucket,
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Name: e.name,
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Deleted: true,
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IsLatest: true,
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ModTime: timeSentinel1970,
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}, nil
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}
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return e.cached.ToFileInfo(bucket, e.name, "", false)
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}
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return getFileInfo(e.metadata, bucket, e.name, "", false)
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}
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// xlmeta returns the decoded metadata.
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// This should not be called on directories.
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func (e *metaCacheEntry) xlmeta() (*xlMetaV2, error) {
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if e.isDir() {
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return nil, errFileNotFound
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}
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if e.cached == nil {
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if len(e.metadata) == 0 {
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// only happens if the entry is not found.
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return nil, errFileNotFound
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}
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var xl xlMetaV2
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err := xl.LoadOrConvert(e.metadata)
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if err != nil {
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return nil, err
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}
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e.cached = &xl
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}
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return e.cached, nil
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}
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// fileInfoVersions returns the metadata as FileInfoVersions.
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// If entry is a directory it is returned as that.
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func (e *metaCacheEntry) fileInfoVersions(bucket string) (FileInfoVersions, error) {
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if e.isDir() {
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return FileInfoVersions{
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Volume: bucket,
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Name: e.name,
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Versions: []FileInfo{
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{
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Volume: bucket,
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Name: e.name,
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Mode: uint32(os.ModeDir),
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},
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},
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}, nil
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}
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// Too small gains to reuse cache here.
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return getFileInfoVersions(e.metadata, bucket, e.name)
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}
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// metaCacheEntries is a slice of metacache entries.
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type metaCacheEntries []metaCacheEntry
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// less function for sorting.
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func (m metaCacheEntries) less(i, j int) bool {
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return m[i].name < m[j].name
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}
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// sort entries by name.
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// m is sorted and a sorted metadata object is returned.
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// Changes to m will also be reflected in the returned object.
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func (m metaCacheEntries) sort() metaCacheEntriesSorted {
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if m.isSorted() {
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return metaCacheEntriesSorted{o: m}
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}
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sort.Slice(m, m.less)
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return metaCacheEntriesSorted{o: m}
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}
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// isSorted returns whether the objects are sorted.
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// This is usually orders of magnitude faster than actually sorting.
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func (m metaCacheEntries) isSorted() bool {
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return sort.SliceIsSorted(m, m.less)
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}
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// shallowClone will create a shallow clone of the array objects,
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// but object metadata will not be cloned.
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func (m metaCacheEntries) shallowClone() metaCacheEntries {
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dst := make(metaCacheEntries, len(m))
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copy(dst, m)
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return dst
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}
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type metadataResolutionParams struct {
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dirQuorum int // Number if disks needed for a directory to 'exist'.
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objQuorum int // Number of disks needed for an object to 'exist'.
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// An optimization request only an 'n' amount of versions from xl.meta
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// to avoid resolving all versions to figure out the latest 'version'
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// for ListObjects, ListObjectsV2
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requestedVersions int
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bucket string // Name of the bucket. Used for generating cached fileinfo.
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strict bool // Versions must match exactly, including all metadata.
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// Reusable slice for resolution
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candidates [][]xlMetaV2ShallowVersion
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}
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// resolve multiple entries.
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// entries are resolved by majority, then if tied by mod-time and versions.
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// Names must match on all entries in m.
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func (m metaCacheEntries) resolve(r *metadataResolutionParams) (selected *metaCacheEntry, ok bool) {
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if len(m) == 0 {
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return nil, false
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}
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dirExists := 0
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if cap(r.candidates) < len(m) {
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r.candidates = make([][]xlMetaV2ShallowVersion, 0, len(m))
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}
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r.candidates = r.candidates[:0]
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objsAgree := 0
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objsValid := 0
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for i := range m {
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entry := &m[i]
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// Empty entry
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if entry.name == "" {
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continue
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}
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if entry.isDir() {
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dirExists++
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selected = entry
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continue
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}
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// Get new entry metadata,
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// shallow decode.
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xl, err := entry.xlmeta()
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if err != nil {
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if !errors.Is(err, errFileNotFound) {
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logger.LogIf(GlobalContext, err)
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}
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continue
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}
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objsValid++
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// Add all valid to candidates.
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r.candidates = append(r.candidates, xl.versions)
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// We select the first object we find as a candidate and see if all match that.
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// This is to quickly identify if all agree.
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if selected == nil {
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selected = entry
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objsAgree = 1
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continue
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}
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// Names match, check meta...
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if prefer, ok := entry.matches(selected, r.strict); ok {
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selected = prefer
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objsAgree++
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continue
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}
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}
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// Return dir entries, if enough...
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if selected != nil && selected.isDir() && dirExists >= r.dirQuorum {
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return selected, true
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}
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// If we would never be able to reach read quorum.
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if objsValid < r.objQuorum {
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return nil, false
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}
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// If all objects agree.
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if selected != nil && objsAgree == objsValid {
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return selected, true
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}
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// If cached is nil we shall skip the entry.
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if selected.cached == nil {
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return nil, false
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}
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// Merge if we have disagreement.
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// Create a new merged result.
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selected = &metaCacheEntry{
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name: selected.name,
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reusable: true,
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cached: &xlMetaV2{metaV: selected.cached.metaV},
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}
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selected.cached.versions = mergeXLV2Versions(r.objQuorum, r.strict, r.requestedVersions, r.candidates...)
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if len(selected.cached.versions) == 0 {
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return nil, false
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}
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// Reserialize
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var err error
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selected.metadata, err = selected.cached.AppendTo(metaDataPoolGet())
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if err != nil {
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logger.LogIf(context.Background(), err)
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return nil, false
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}
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return selected, true
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}
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// firstFound returns the first found and the number of set entries.
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func (m metaCacheEntries) firstFound() (first *metaCacheEntry, n int) {
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for i, entry := range m {
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if entry.name != "" {
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n++
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if first == nil {
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first = &m[i]
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}
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}
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}
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return first, n
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}
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// names will return all names in order.
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// Since this allocates it should not be used in critical functions.
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func (m metaCacheEntries) names() []string {
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res := make([]string, 0, len(m))
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for _, obj := range m {
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res = append(res, obj.name)
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}
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return res
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}
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// metaCacheEntriesSorted contains metacache entries that are sorted.
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type metaCacheEntriesSorted struct {
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o metaCacheEntries
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// list id is not serialized
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listID string
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// Reuse buffers
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reuse bool
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}
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// shallowClone will create a shallow clone of the array objects,
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// but object metadata will not be cloned.
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func (m metaCacheEntriesSorted) shallowClone() metaCacheEntriesSorted {
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// We have value receiver so we already have a copy.
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m.o = m.o.shallowClone()
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return m
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}
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// fileInfoVersions converts the metadata to FileInfoVersions where possible.
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// Metadata that cannot be decoded is skipped.
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func (m *metaCacheEntriesSorted) fileInfoVersions(bucket, prefix, delimiter, afterV string) (versions []ObjectInfo) {
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versions = make([]ObjectInfo, 0, m.len())
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prevPrefix := ""
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vcfg, _ := globalBucketVersioningSys.Get(bucket)
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for _, entry := range m.o {
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if entry.isObject() {
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if delimiter != "" {
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idx := strings.Index(strings.TrimPrefix(entry.name, prefix), delimiter)
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if idx >= 0 {
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idx = len(prefix) + idx + len(delimiter)
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currPrefix := entry.name[:idx]
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if currPrefix == prevPrefix {
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continue
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}
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prevPrefix = currPrefix
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versions = append(versions, ObjectInfo{
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IsDir: true,
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Bucket: bucket,
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Name: currPrefix,
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})
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continue
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}
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}
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fiv, err := entry.fileInfoVersions(bucket)
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if err != nil {
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continue
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}
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fiVersions := fiv.Versions
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if afterV != "" {
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vidMarkerIdx := fiv.findVersionIndex(afterV)
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if vidMarkerIdx >= 0 {
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fiVersions = fiVersions[vidMarkerIdx+1:]
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}
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afterV = ""
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}
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for _, version := range fiVersions {
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versioned := vcfg != nil && vcfg.Versioned(entry.name)
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versions = append(versions, version.ToObjectInfo(bucket, entry.name, versioned))
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}
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continue
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}
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if entry.isDir() {
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if delimiter == "" {
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continue
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}
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idx := strings.Index(strings.TrimPrefix(entry.name, prefix), delimiter)
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if idx < 0 {
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continue
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}
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idx = len(prefix) + idx + len(delimiter)
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currPrefix := entry.name[:idx]
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if currPrefix == prevPrefix {
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continue
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}
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prevPrefix = currPrefix
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versions = append(versions, ObjectInfo{
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IsDir: true,
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Bucket: bucket,
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Name: currPrefix,
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})
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}
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}
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return versions
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}
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// fileInfos converts the metadata to ObjectInfo where possible.
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// Metadata that cannot be decoded is skipped.
|
|
func (m *metaCacheEntriesSorted) fileInfos(bucket, prefix, delimiter string) (objects []ObjectInfo) {
|
|
objects = make([]ObjectInfo, 0, m.len())
|
|
prevPrefix := ""
|
|
|
|
vcfg, _ := globalBucketVersioningSys.Get(bucket)
|
|
|
|
for _, entry := range m.o {
|
|
if entry.isObject() {
|
|
if delimiter != "" {
|
|
idx := strings.Index(strings.TrimPrefix(entry.name, prefix), delimiter)
|
|
if idx >= 0 {
|
|
idx = len(prefix) + idx + len(delimiter)
|
|
currPrefix := entry.name[:idx]
|
|
if currPrefix == prevPrefix {
|
|
continue
|
|
}
|
|
prevPrefix = currPrefix
|
|
objects = append(objects, ObjectInfo{
|
|
IsDir: true,
|
|
Bucket: bucket,
|
|
Name: currPrefix,
|
|
})
|
|
continue
|
|
}
|
|
}
|
|
|
|
fi, err := entry.fileInfo(bucket)
|
|
if err == nil {
|
|
versioned := vcfg != nil && vcfg.Versioned(entry.name)
|
|
objects = append(objects, fi.ToObjectInfo(bucket, entry.name, versioned))
|
|
}
|
|
continue
|
|
}
|
|
if entry.isDir() {
|
|
if delimiter == "" {
|
|
continue
|
|
}
|
|
idx := strings.Index(strings.TrimPrefix(entry.name, prefix), delimiter)
|
|
if idx < 0 {
|
|
continue
|
|
}
|
|
idx = len(prefix) + idx + len(delimiter)
|
|
currPrefix := entry.name[:idx]
|
|
if currPrefix == prevPrefix {
|
|
continue
|
|
}
|
|
prevPrefix = currPrefix
|
|
objects = append(objects, ObjectInfo{
|
|
IsDir: true,
|
|
Bucket: bucket,
|
|
Name: currPrefix,
|
|
})
|
|
}
|
|
}
|
|
|
|
return objects
|
|
}
|
|
|
|
// forwardTo will truncate m so only entries that are s or after is in the list.
|
|
func (m *metaCacheEntriesSorted) forwardTo(s string) {
|
|
if s == "" {
|
|
return
|
|
}
|
|
idx := sort.Search(len(m.o), func(i int) bool {
|
|
return m.o[i].name >= s
|
|
})
|
|
if m.reuse {
|
|
for i, entry := range m.o[:idx] {
|
|
metaDataPoolPut(entry.metadata)
|
|
m.o[i].metadata = nil
|
|
}
|
|
}
|
|
|
|
m.o = m.o[idx:]
|
|
}
|
|
|
|
// forwardPast will truncate m so only entries that are after s is in the list.
|
|
func (m *metaCacheEntriesSorted) forwardPast(s string) {
|
|
if s == "" {
|
|
return
|
|
}
|
|
idx := sort.Search(len(m.o), func(i int) bool {
|
|
return m.o[i].name > s
|
|
})
|
|
if m.reuse {
|
|
for i, entry := range m.o[:idx] {
|
|
metaDataPoolPut(entry.metadata)
|
|
m.o[i].metadata = nil
|
|
}
|
|
}
|
|
m.o = m.o[idx:]
|
|
}
|
|
|
|
// mergeEntryChannels will merge entries from in and return them sorted on out.
|
|
// To signify no more results are on an input channel, close it.
|
|
// The output channel will be closed when all inputs are emptied.
|
|
// If file names are equal, compareMeta is called to select which one to choose.
|
|
// The entry not chosen will be discarded.
|
|
// If the context is canceled the function will return the error,
|
|
// otherwise the function will return nil.
|
|
func mergeEntryChannels(ctx context.Context, in []chan metaCacheEntry, out chan<- metaCacheEntry, readQuorum int) error {
|
|
defer close(out)
|
|
top := make([]*metaCacheEntry, len(in))
|
|
nDone := 0
|
|
ctxDone := ctx.Done()
|
|
|
|
// Use simpler forwarder.
|
|
if len(in) == 1 {
|
|
for {
|
|
select {
|
|
case <-ctxDone:
|
|
return ctx.Err()
|
|
case v, ok := <-in[0]:
|
|
if !ok {
|
|
return nil
|
|
}
|
|
select {
|
|
case <-ctxDone:
|
|
return ctx.Err()
|
|
case out <- v:
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
selectFrom := func(idx int) error {
|
|
select {
|
|
case <-ctxDone:
|
|
return ctx.Err()
|
|
case entry, ok := <-in[idx]:
|
|
if !ok {
|
|
top[idx] = nil
|
|
nDone++
|
|
} else {
|
|
top[idx] = &entry
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
// Populate all...
|
|
for i := range in {
|
|
if err := selectFrom(i); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
last := ""
|
|
var toMerge []int
|
|
|
|
// Choose the best to return.
|
|
for {
|
|
if nDone == len(in) {
|
|
return nil
|
|
}
|
|
best := top[0]
|
|
bestIdx := 0
|
|
toMerge = toMerge[:0]
|
|
for i, other := range top[1:] {
|
|
otherIdx := i + 1
|
|
if other == nil {
|
|
continue
|
|
}
|
|
if best == nil {
|
|
best = other
|
|
bestIdx = otherIdx
|
|
continue
|
|
}
|
|
// We should make sure to avoid objects and directories
|
|
// of this fashion such as
|
|
// - foo-1
|
|
// - foo-1/
|
|
// we should avoid this situation by making sure that
|
|
// we compare the `foo-1/` after path.Clean() to
|
|
// de-dup the entries.
|
|
if path.Clean(best.name) == path.Clean(other.name) {
|
|
toMerge = append(toMerge, otherIdx)
|
|
continue
|
|
}
|
|
if best.name > other.name {
|
|
toMerge = toMerge[:0]
|
|
best = other
|
|
bestIdx = otherIdx
|
|
}
|
|
}
|
|
|
|
// Merge any unmerged
|
|
if len(toMerge) > 0 {
|
|
versions := make([]xlMetaV2ShallowVersion, 0, len(toMerge)+1)
|
|
xl, err := best.xlmeta()
|
|
if err == nil {
|
|
versions = append(versions, xl.versions...)
|
|
}
|
|
for _, idx := range toMerge {
|
|
other := top[idx]
|
|
if other == nil {
|
|
continue
|
|
}
|
|
xl2, err := other.xlmeta()
|
|
if err != nil {
|
|
if err := selectFrom(idx); err != nil {
|
|
return err
|
|
}
|
|
continue
|
|
}
|
|
if xl == nil {
|
|
// Discard current "best"
|
|
if err := selectFrom(bestIdx); err != nil {
|
|
return err
|
|
}
|
|
bestIdx = idx
|
|
best = other
|
|
xl = xl2
|
|
} else {
|
|
// Mark read, unless we added it as new "best".
|
|
if err := selectFrom(idx); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
versions = append(versions, xl2.versions...)
|
|
}
|
|
if xl != nil && len(versions) > 0 {
|
|
// Merge all versions. 'strict' doesn't matter since we only need one.
|
|
xl.versions = mergeXLV2Versions(readQuorum, true, 0, versions)
|
|
if meta, err := xl.AppendTo(metaDataPoolGet()); err == nil {
|
|
if best.reusable {
|
|
metaDataPoolPut(best.metadata)
|
|
}
|
|
best.metadata = meta
|
|
best.cached = xl
|
|
}
|
|
}
|
|
toMerge = toMerge[:0]
|
|
}
|
|
if best.name > last {
|
|
select {
|
|
case <-ctxDone:
|
|
return ctx.Err()
|
|
case out <- *best:
|
|
last = best.name
|
|
}
|
|
} else if serverDebugLog {
|
|
console.Debugln("mergeEntryChannels: discarding duplicate", best.name, "<=", last)
|
|
}
|
|
// Replace entry we just sent.
|
|
if err := selectFrom(bestIdx); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
|
|
// merge will merge other into m.
|
|
// If the same entries exists in both and metadata matches only one is added,
|
|
// otherwise the entry from m will be placed first.
|
|
// Operation time is expected to be O(n+m).
|
|
func (m *metaCacheEntriesSorted) merge(other metaCacheEntriesSorted, limit int) {
|
|
merged := make(metaCacheEntries, 0, m.len()+other.len())
|
|
a := m.entries()
|
|
b := other.entries()
|
|
for len(a) > 0 && len(b) > 0 {
|
|
switch {
|
|
case a[0].name == b[0].name && bytes.Equal(a[0].metadata, b[0].metadata):
|
|
// Same, discard one.
|
|
merged = append(merged, a[0])
|
|
a = a[1:]
|
|
b = b[1:]
|
|
case a[0].name < b[0].name:
|
|
merged = append(merged, a[0])
|
|
a = a[1:]
|
|
default:
|
|
merged = append(merged, b[0])
|
|
b = b[1:]
|
|
}
|
|
if limit > 0 && len(merged) >= limit {
|
|
break
|
|
}
|
|
}
|
|
// Append anything left.
|
|
if limit < 0 || len(merged) < limit {
|
|
merged = append(merged, a...)
|
|
merged = append(merged, b...)
|
|
}
|
|
m.o = merged
|
|
}
|
|
|
|
// filterPrefix will filter m to only contain entries with the specified prefix.
|
|
func (m *metaCacheEntriesSorted) filterPrefix(s string) {
|
|
if s == "" {
|
|
return
|
|
}
|
|
m.forwardTo(s)
|
|
for i, o := range m.o {
|
|
if !o.hasPrefix(s) {
|
|
m.o = m.o[:i]
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
// filterObjectsOnly will remove prefix directories.
|
|
// Order is preserved, but the underlying slice is modified.
|
|
func (m *metaCacheEntriesSorted) filterObjectsOnly() {
|
|
dst := m.o[:0]
|
|
for _, o := range m.o {
|
|
if !o.isDir() {
|
|
dst = append(dst, o)
|
|
}
|
|
}
|
|
m.o = dst
|
|
}
|
|
|
|
// filterPrefixesOnly will remove objects.
|
|
// Order is preserved, but the underlying slice is modified.
|
|
func (m *metaCacheEntriesSorted) filterPrefixesOnly() {
|
|
dst := m.o[:0]
|
|
for _, o := range m.o {
|
|
if o.isDir() {
|
|
dst = append(dst, o)
|
|
}
|
|
}
|
|
m.o = dst
|
|
}
|
|
|
|
// filterRecursiveEntries will keep entries only with the prefix that doesn't contain separator.
|
|
// This can be used to remove recursive listings.
|
|
// To return root elements only set prefix to an empty string.
|
|
// Order is preserved, but the underlying slice is modified.
|
|
func (m *metaCacheEntriesSorted) filterRecursiveEntries(prefix, separator string) {
|
|
dst := m.o[:0]
|
|
if prefix != "" {
|
|
m.forwardTo(prefix)
|
|
for _, o := range m.o {
|
|
ext := strings.TrimPrefix(o.name, prefix)
|
|
if len(ext) != len(o.name) {
|
|
if !strings.Contains(ext, separator) {
|
|
dst = append(dst, o)
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
// No prefix, simpler
|
|
for _, o := range m.o {
|
|
if !strings.Contains(o.name, separator) {
|
|
dst = append(dst, o)
|
|
}
|
|
}
|
|
}
|
|
m.o = dst
|
|
}
|
|
|
|
// truncate the number of entries to maximum n.
|
|
func (m *metaCacheEntriesSorted) truncate(n int) {
|
|
if m == nil {
|
|
return
|
|
}
|
|
if len(m.o) > n {
|
|
if m.reuse {
|
|
for i, entry := range m.o[n:] {
|
|
metaDataPoolPut(entry.metadata)
|
|
m.o[n+i].metadata = nil
|
|
}
|
|
}
|
|
m.o = m.o[:n]
|
|
}
|
|
}
|
|
|
|
// len returns the number of objects and prefix dirs in m.
|
|
func (m *metaCacheEntriesSorted) len() int {
|
|
if m == nil {
|
|
return 0
|
|
}
|
|
return len(m.o)
|
|
}
|
|
|
|
// entries returns the underlying objects as is currently represented.
|
|
func (m *metaCacheEntriesSorted) entries() metaCacheEntries {
|
|
if m == nil {
|
|
return nil
|
|
}
|
|
return m.o
|
|
}
|