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map.go
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map.go
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// Copyright 2020-2024 Buf Technologies, Inc.
//
// 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.
package storage
import (
"context"
"errors"
"fmt"
"io"
"io/fs"
"github.com/bufbuild/buf/private/pkg/normalpath"
"github.com/bufbuild/buf/private/pkg/storage/storageutil"
)
// MapReadBucket maps the ReadBucket.
//
// If the Mappers are empty, the original ReadBucket is returned.
// If there is more than one Mapper, the Mappers are called in order
// for UnmapFullPath, with the order reversed for MapPath and MapPrefix.
//
// That is, order these assuming you are starting with a full path and
// working to a path.
func MapReadBucket(readBucket ReadBucket, mappers ...Mapper) ReadBucket {
if len(mappers) == 0 {
return readBucket
}
return newMapReadBucketCloser(readBucket, nil, MapChain(mappers...))
}
// MapReadBucketCloser maps the ReadBucketCloser.
//
// If the Mappers are empty, the original ReadBucketCloser is returned.
// If there is more than one Mapper, the Mappers are called in order
// for UnmapFullPath, with the order reversed for MapPath and MapPrefix.
//
// That is, order these assuming you are starting with a full path and
// working to a path.
func MapReadBucketCloser(readBucketCloser ReadBucketCloser, mappers ...Mapper) ReadBucketCloser {
if len(mappers) == 0 {
return readBucketCloser
}
return newMapReadBucketCloser(readBucketCloser, readBucketCloser.Close, MapChain(mappers...))
}
// MapWriteBucket maps the WriteBucket.
//
// If the Mappers are empty, the original WriteBucket is returned.
// If there is more than one Mapper, the Mappers are called in order
// for UnmapFullPath, with the order reversed for MapPath and MapPrefix.
//
// That is, order these assuming you are starting with a full path and
// working to a path.
//
// If a path that does not match is called for Put, an error is returned.
func MapWriteBucket(writeBucket WriteBucket, mappers ...Mapper) WriteBucket {
if len(mappers) == 0 {
return writeBucket
}
return newMapWriteBucketCloser(writeBucket, nil, MapChain(mappers...))
}
// MapWriteBucketCloser maps the WriteBucketCloser.
//
// If the Mappers are empty, the original WriteBucketCloser is returned.
// If there is more than one Mapper, the Mappers are called in order
// for UnmapFullPath, with the order reversed for MapPath and MapPrefix.
//
// That is, order these assuming you are starting with a full path and
// working to a path.
//
// If a path that does not match is called for Put, an error is returned.
func MapWriteBucketCloser(writeBucketCloser WriteBucketCloser, mappers ...Mapper) WriteBucketCloser {
if len(mappers) == 0 {
return writeBucketCloser
}
return newMapWriteBucketCloser(writeBucketCloser, writeBucketCloser.Close, MapChain(mappers...))
}
// MapReadWriteBucket maps the ReadWriteBucket.
//
// If the Mappers are empty, the original ReadWriteBucket is returned.
// If there is more than one Mapper, the Mappers are called in order
// for UnmapFullPath, with the order reversed for MapPath and MapPrefix.
//
// That is, order these assuming you are starting with a full path and
// working to a path.
func MapReadWriteBucket(readWriteBucket ReadWriteBucket, mappers ...Mapper) ReadWriteBucket {
if len(mappers) == 0 {
return readWriteBucket
}
mapper := MapChain(mappers...)
return compositeReadWriteBucketCloser{
newMapReadBucketCloser(readWriteBucket, nil, mapper),
newMapWriteBucketCloser(readWriteBucket, nil, mapper),
nil,
}
}
// MapReadWriteBucketCloser maps the ReadWriteBucketCloser.
//
// If the Mappers are empty, the original ReadWriteBucketCloser is returned.
// If there is more than one Mapper, the Mappers are called in order
// for UnmapFullPath, with the order reversed for MapPath and MapPrefix.
//
// That is, order these assuming you are starting with a full path and
// working to a path.
func MapReadWriteBucketCloser(readWriteBucketCloser ReadWriteBucketCloser, mappers ...Mapper) ReadWriteBucketCloser {
if len(mappers) == 0 {
return readWriteBucketCloser
}
mapper := MapChain(mappers...)
return compositeReadWriteBucketCloser{
newMapReadBucketCloser(readWriteBucketCloser, nil, mapper),
newMapWriteBucketCloser(readWriteBucketCloser, nil, mapper),
readWriteBucketCloser.Close,
}
}
type mapReadBucketCloser struct {
delegate ReadBucket
closeFunc func() error
mapper Mapper
}
func newMapReadBucketCloser(
delegate ReadBucket,
closeFunc func() error,
mapper Mapper,
) *mapReadBucketCloser {
return &mapReadBucketCloser{
delegate: delegate,
closeFunc: closeFunc,
mapper: mapper,
}
}
func (r *mapReadBucketCloser) Get(ctx context.Context, path string) (ReadObjectCloser, error) {
fullPath, err := r.getFullPath("read", path)
if err != nil {
return nil, err
}
readObjectCloser, err := r.delegate.Get(ctx, fullPath)
// TODO: if this is a path error, we should replace the path
if err != nil {
return nil, err
}
return replaceReadObjectCloserPath(readObjectCloser, path), nil
}
func (r *mapReadBucketCloser) Stat(ctx context.Context, path string) (ObjectInfo, error) {
fullPath, err := r.getFullPath("stat", path)
if err != nil {
return nil, err
}
objectInfo, err := r.delegate.Stat(ctx, fullPath)
// TODO: if this is a path error, we should replace the path
if err != nil {
return nil, err
}
return replaceObjectInfoPath(objectInfo, path), nil
}
func (r *mapReadBucketCloser) Walk(ctx context.Context, prefix string, f func(ObjectInfo) error) error {
prefix, err := normalpath.NormalizeAndValidate(prefix)
if err != nil {
return err
}
fullPrefix, matches := r.mapper.MapPrefix(prefix)
if !matches {
return nil
}
return r.delegate.Walk(
ctx,
fullPrefix,
func(objectInfo ObjectInfo) error {
path, matches, err := r.mapper.UnmapFullPath(objectInfo.Path())
if err != nil {
return err
}
if !matches {
return nil
}
return f(replaceObjectInfoPath(objectInfo, path))
},
)
}
func (r *mapReadBucketCloser) Close() error {
if r.closeFunc != nil {
return r.closeFunc()
}
return nil
}
func (r *mapReadBucketCloser) getFullPath(op string, path string) (string, error) {
path, err := normalpath.NormalizeAndValidate(path)
if err != nil {
return "", err
}
if path == "." {
return "", errors.New("cannot get root")
}
fullPath, matches := r.mapper.MapPath(path)
if !matches {
return "", &fs.PathError{Op: op, Path: path, Err: fs.ErrNotExist}
}
return fullPath, nil
}
type mapWriteBucketCloser struct {
delegate WriteBucket
closeFunc func() error
mapper Mapper
}
func newMapWriteBucketCloser(
delegate WriteBucket,
closeFunc func() error,
mapper Mapper,
) *mapWriteBucketCloser {
return &mapWriteBucketCloser{
delegate: delegate,
mapper: mapper,
}
}
func (w *mapWriteBucketCloser) Put(ctx context.Context, path string, opts ...PutOption) (WriteObjectCloser, error) {
fullPath, err := w.getFullPath(path)
if err != nil {
return nil, err
}
writeObjectCloser, err := w.delegate.Put(ctx, fullPath, opts...)
// TODO: if this is a path error, we should replace the path
if err != nil {
return nil, err
}
return replaceWriteObjectCloserExternalAndLocalPathsNotSupported(writeObjectCloser), nil
}
func (w *mapWriteBucketCloser) Delete(ctx context.Context, path string) error {
fullPath, err := w.getFullPath(path)
if err != nil {
return err
}
return w.delegate.Delete(ctx, fullPath)
}
func (w *mapWriteBucketCloser) DeleteAll(ctx context.Context, prefix string) error {
prefix, err := normalpath.NormalizeAndValidate(prefix)
if err != nil {
return err
}
fullPrefix, matches := w.mapper.MapPrefix(prefix)
if !matches {
return nil
}
return w.delegate.DeleteAll(ctx, fullPrefix)
}
func (*mapWriteBucketCloser) SetExternalAndLocalPathsSupported() bool {
return false
}
func (w *mapWriteBucketCloser) Close() error {
if w.closeFunc != nil {
return w.closeFunc()
}
return nil
}
func (w *mapWriteBucketCloser) getFullPath(path string) (string, error) {
path, err := normalpath.NormalizeAndValidate(path)
if err != nil {
return "", err
}
if path == "." {
return "", errors.New("cannot get root")
}
fullPath, matches := w.mapper.MapPath(path)
if !matches {
return "", fmt.Errorf("path does not match: %s", path)
}
return fullPath, nil
}
func replaceObjectInfoPath(objectInfo ObjectInfo, path string) ObjectInfo {
if objectInfo.Path() == path {
return objectInfo
}
return storageutil.NewObjectInfo(
path,
objectInfo.ExternalPath(),
objectInfo.LocalPath(),
)
}
func replaceReadObjectCloserPath(readObjectCloser ReadObjectCloser, path string) ReadObjectCloser {
if readObjectCloser.Path() == path {
return readObjectCloser
}
return compositeReadObjectCloser{replaceObjectInfoPath(readObjectCloser, path), readObjectCloser}
}
func replaceWriteObjectCloserExternalAndLocalPathsNotSupported(writeObjectCloser WriteObjectCloser) WriteObjectCloser {
return writeObjectCloserExternalAndLocalPathsNotSuppoted{writeObjectCloser}
}
type writeObjectCloserExternalAndLocalPathsNotSuppoted struct {
io.WriteCloser
}
func (writeObjectCloserExternalAndLocalPathsNotSuppoted) SetExternalPath(string) error {
return ErrSetExternalPathUnsupported
}
func (writeObjectCloserExternalAndLocalPathsNotSuppoted) SetLocalPath(string) error {
return ErrSetLocalPathUnsupported
}