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autoincrement.go
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autoincrement.go
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// Copyright 2018-2022 CERN
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// In applying this license, CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
package index
import (
"context"
"os"
"path"
"path/filepath"
"sort"
"strconv"
"strings"
idxerrs "github.com/cs3org/reva/v2/pkg/storage/utils/indexer/errors"
"github.com/cs3org/reva/v2/pkg/storage/utils/indexer/option"
metadata "github.com/cs3org/reva/v2/pkg/storage/utils/metadata"
)
// Autoincrement are fields for an index of type autoincrement.
type Autoincrement struct {
indexBy option.IndexBy
typeName string
filesDir string
indexBaseDir string
indexRootDir string
bound *option.Bound
storage metadata.Storage
}
// NewAutoincrementIndex instantiates a new AutoincrementIndex instance.
func NewAutoincrementIndex(storage metadata.Storage, o ...option.Option) Index {
opts := &option.Options{}
for _, opt := range o {
opt(opts)
}
u := &Autoincrement{
storage: storage,
indexBy: opts.IndexBy,
typeName: opts.TypeName,
filesDir: opts.FilesDir,
bound: opts.Bound,
indexBaseDir: path.Join(opts.Prefix, "index."+storage.Backend()),
indexRootDir: path.Join(opts.Prefix, "index."+storage.Backend(), strings.Join([]string{"autoincrement", opts.TypeName, opts.IndexBy.String()}, ".")),
}
return u
}
// Init initializes an autoincrement index.
func (idx *Autoincrement) Init() error {
if err := idx.storage.MakeDirIfNotExist(context.Background(), idx.indexBaseDir); err != nil {
return err
}
return idx.storage.MakeDirIfNotExist(context.Background(), idx.indexRootDir)
}
// Lookup exact lookup by value.
func (idx *Autoincrement) Lookup(v string) ([]string, error) {
searchPath := path.Join(idx.indexRootDir, v)
oldname, err := idx.storage.ResolveSymlink(context.Background(), searchPath)
if err != nil {
if os.IsNotExist(err) {
err = &idxerrs.NotFoundErr{TypeName: idx.typeName, IndexBy: idx.indexBy, Value: v}
}
return nil, err
}
return []string{oldname}, nil
}
// Add a new value to the index.
func (idx *Autoincrement) Add(id, v string) (string, error) {
var newName string
if v == "" {
next, err := idx.next()
if err != nil {
return "", err
}
newName = path.Join(idx.indexRootDir, strconv.Itoa(next))
} else {
newName = path.Join(idx.indexRootDir, v)
}
if err := idx.storage.CreateSymlink(context.Background(), id, newName); err != nil {
if os.IsExist(err) {
return "", &idxerrs.AlreadyExistsErr{TypeName: idx.typeName, IndexBy: idx.indexBy, Value: v}
}
return "", err
}
return newName, nil
}
// Remove a value v from an index.
func (idx *Autoincrement) Remove(_ string, v string) error {
if v == "" {
return nil
}
searchPath := path.Join(idx.indexRootDir, v)
_, err := idx.storage.ResolveSymlink(context.Background(), searchPath)
if err != nil {
if os.IsNotExist(err) {
err = &idxerrs.NotFoundErr{TypeName: idx.typeName, IndexBy: idx.indexBy, Value: v}
}
return err
}
deletePath := path.Join("/", idx.indexRootDir, v)
return idx.storage.Delete(context.Background(), deletePath)
}
// Update index from <oldV> to <newV>.
func (idx *Autoincrement) Update(id, oldV, newV string) error {
if err := idx.Remove(id, oldV); err != nil {
return err
}
_, err := idx.Add(id, newV)
return err
}
// Search allows for glob search on the index.
func (idx *Autoincrement) Search(pattern string) ([]string, error) {
paths, err := idx.storage.ReadDir(context.Background(), idx.indexRootDir)
if err != nil {
return nil, err
}
searchPath := idx.indexRootDir
matches := make([]string, 0)
for _, p := range paths {
if found, err := filepath.Match(pattern, path.Base(p)); found {
if err != nil {
return nil, err
}
oldPath, err := idx.storage.ResolveSymlink(context.Background(), path.Join(searchPath, path.Base(p)))
if err != nil {
return nil, err
}
matches = append(matches, oldPath)
}
}
return matches, nil
}
// CaseInsensitive undocumented.
func (idx *Autoincrement) CaseInsensitive() bool {
return false
}
// IndexBy undocumented.
func (idx *Autoincrement) IndexBy() option.IndexBy {
return idx.indexBy
}
// TypeName undocumented.
func (idx *Autoincrement) TypeName() string {
return idx.typeName
}
// FilesDir undocumented.
func (idx *Autoincrement) FilesDir() string {
return idx.filesDir
}
func (idx *Autoincrement) next() (int, error) {
paths, err := idx.storage.ReadDir(context.Background(), idx.indexRootDir)
if err != nil {
return -1, err
}
if len(paths) == 0 {
return int(idx.bound.Lower), nil
}
sort.Slice(paths, func(i, j int) bool {
a, _ := strconv.Atoi(path.Base(paths[i]))
b, _ := strconv.Atoi(path.Base(paths[j]))
return a < b
})
latest, err := strconv.Atoi(path.Base(paths[len(paths)-1])) // would returning a string be a better interface?
if err != nil {
return -1, err
}
if int64(latest) < idx.bound.Lower {
return int(idx.bound.Lower), nil
}
return latest + 1, nil
}
// Delete deletes the index folder from its storage.
func (idx *Autoincrement) Delete() error {
return idx.storage.Delete(context.Background(), idx.indexRootDir)
}