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fileprovider.go
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fileprovider.go
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package docdb
import (
"context"
"slices"
fs "github.com/ungerik/go-fs"
)
// FileProvider is an interface for read access to named files
type FileProvider interface {
HasFile(filename string) (bool, error)
ListFiles(ctx context.Context) (filenames []string, err error)
ReadFile(ctx context.Context, filename string) ([]byte, error)
}
///////////////////////////////////////////////////////////////////////////////
// DirFileProvider
// DirFileProvider returns a FileProvider for a fs.File directory
func DirFileProvider(dir fs.File) FileProvider {
return dirFileProvider{dir}
}
type dirFileProvider struct {
dir fs.File
}
func (p dirFileProvider) HasFile(filename string) (bool, error) {
return p.dir.Join(filename).Exists(), nil
}
func (p dirFileProvider) ListFiles(ctx context.Context) (filenames []string, err error) {
err = p.dir.ListDirContext(ctx, func(file fs.File) error {
filenames = append(filenames, file.Name())
return nil
})
if err != nil {
return nil, err
}
slices.Sort(filenames)
return filenames, nil
}
func (p dirFileProvider) ReadFile(ctx context.Context, filename string) ([]byte, error) {
return p.dir.Join(filename).ReadAllContext(ctx)
}
///////////////////////////////////////////////////////////////////////////////
// ExtFileProvider
// ExtFileProvider returns a FileProvider that extends a base FileProvider
// with additional files that will be returned before the files of the base FileProvider.
func ExtFileProvider(base FileProvider, extFiles ...fs.FileReader) FileProvider {
return extFileProvider{base, extFiles}
}
type extFileProvider struct {
base FileProvider
extFiles []fs.FileReader
}
func (p extFileProvider) HasFile(filename string) (bool, error) {
for _, f := range p.extFiles {
if f.Name() == filename {
return true, nil
}
}
return p.base.HasFile(filename)
}
func (p extFileProvider) ListFiles(ctx context.Context) (filenames []string, err error) {
filenames, err = p.base.ListFiles(ctx)
if err != nil {
return nil, err
}
for _, f := range p.extFiles {
if !slices.Contains(filenames, f.Name()) {
filenames = append(filenames, f.Name())
}
}
slices.Sort(filenames)
return filenames, nil
}
func (p extFileProvider) ReadFile(ctx context.Context, filename string) ([]byte, error) {
for _, f := range p.extFiles {
if f.Name() == filename {
return f.ReadAllContext(ctx)
}
}
return p.base.ReadFile(ctx, filename)
}
///////////////////////////////////////////////////////////////////////////////
// RemoveFileProvider
// RemoveFileProvider returns a FileProvider that wraps a base FileProvider
// and does not return files with the passed removeFilenames.
func RemoveFileProvider(base FileProvider, removeFilenames ...string) FileProvider {
return &removeFileProvider{base, removeFilenames}
}
type removeFileProvider struct {
base FileProvider
remove []string
}
func (p *removeFileProvider) HasFile(filename string) (bool, error) {
if slices.Contains(p.remove, filename) {
return false, nil
}
return p.base.HasFile(filename)
}
func (p removeFileProvider) ListFiles(ctx context.Context) (filenames []string, err error) {
filenames, err = p.base.ListFiles(ctx)
if err != nil {
return nil, err
}
filenames = slices.DeleteFunc(filenames, func(filename string) bool {
return slices.Contains(p.remove, filename)
})
return filenames, nil
}
func (p removeFileProvider) ReadFile(ctx context.Context, filename string) ([]byte, error) {
if slices.Contains(p.remove, filename) {
return nil, fs.NewErrPathDoesNotExist(filename)
}
return p.base.ReadFile(ctx, filename)
}
// func MemFileProvider(file fs.MemFile) FileProvider {
// return memFileProvider{file}
// }
// type memFileProvider struct {
// file fs.MemFile
// }
// func (mem memFileProvider) HasFile(filename string) (bool, error) {
// return mem.file.FileName == filename, nil
// }
// func (mem memFileProvider) ListFiles(ctx context.Context) (filenames []string, err error) {
// return []string{mem.file.FileName}, nil
// }
// func (mem memFileProvider) ReadFile(ctx context.Context, filename string) ([]byte, error) {
// if filename != mem.file.FileName {
// return nil, fs.NewErrPathDoesNotExist(filename)
// }
// return mem.file.FileData, nil
// }