databricks-cli/libs/filer/local_client.go

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package filer
import (
"context"
"io"
"io/fs"
"os"
"path/filepath"
"golang.org/x/exp/slices"
)
// LocalClient implements the [Filer] interface for the local filesystem.
type LocalClient struct {
// File operations will be relative to this path.
root RootPath
}
func NewLocalClient(root string) (Filer, error) {
return &LocalClient{
root: NewRootPath(root),
}, nil
}
func (w *LocalClient) Write(ctx context.Context, name string, reader io.Reader, mode ...WriteMode) error {
absPath, err := w.root.Join(name)
if err != nil {
return err
}
flags := os.O_WRONLY | os.O_CREATE
if slices.Contains(mode, OverwriteIfExists) {
flags |= os.O_TRUNC
} else {
flags |= os.O_EXCL
}
absPath = filepath.FromSlash(absPath)
f, err := os.OpenFile(absPath, flags, 0644)
if os.IsNotExist(err) && slices.Contains(mode, CreateParentDirectories) {
// Create parent directories if they don't exist.
err = os.MkdirAll(filepath.Dir(absPath), 0755)
if err != nil {
return err
}
// Try again.
f, err = os.OpenFile(absPath, flags, 0644)
}
if err != nil {
switch {
case os.IsNotExist(err):
return NoSuchDirectoryError{path: absPath}
case os.IsExist(err):
return FileAlreadyExistsError{path: absPath}
default:
return err
}
}
_, err = io.Copy(f, reader)
cerr := f.Close()
if err == nil {
err = cerr
}
return err
}
func (w *LocalClient) Read(ctx context.Context, name string) (io.ReadCloser, error) {
absPath, err := w.root.Join(name)
if err != nil {
return nil, err
}
// This stat call serves two purposes:
// 1. Checks file at path exists, and throws an error if it does not
// 2. Allows us to error out if the path is a directory
absPath = filepath.FromSlash(absPath)
stat, err := os.Stat(absPath)
if err != nil {
if os.IsNotExist(err) {
return nil, FileDoesNotExistError{path: absPath}
}
return nil, err
}
if stat.IsDir() {
return nil, NotAFile{path: absPath}
}
return os.Open(absPath)
}
func (w *LocalClient) Delete(ctx context.Context, name string, mode ...DeleteMode) error {
absPath, err := w.root.Join(name)
if err != nil {
return err
}
// Illegal to delete the root path.
if absPath == w.root.rootPath {
return CannotDeleteRootError{}
}
absPath = filepath.FromSlash(absPath)
err = os.Remove(absPath)
// Return early on success.
if err == nil {
return nil
}
if os.IsNotExist(err) {
return FileDoesNotExistError{path: absPath}
}
if os.IsExist(err) {
if slices.Contains(mode, DeleteRecursively) {
return os.RemoveAll(absPath)
}
return DirectoryNotEmptyError{path: absPath}
}
return err
}
func (w *LocalClient) ReadDir(ctx context.Context, name string) ([]fs.DirEntry, error) {
absPath, err := w.root.Join(name)
if err != nil {
return nil, err
}
absPath = filepath.FromSlash(absPath)
stat, err := os.Stat(absPath)
if err != nil {
if os.IsNotExist(err) {
return nil, NoSuchDirectoryError{path: absPath}
}
return nil, err
}
if !stat.IsDir() {
return nil, NotADirectory{path: absPath}
}
return os.ReadDir(absPath)
}
func (w *LocalClient) Mkdir(ctx context.Context, name string) error {
dirPath, err := w.root.Join(name)
if err != nil {
return err
}
dirPath = filepath.FromSlash(dirPath)
return os.MkdirAll(dirPath, 0755)
}
func (w *LocalClient) Stat(ctx context.Context, name string) (fs.FileInfo, error) {
absPath, err := w.root.Join(name)
if err != nil {
return nil, err
}
absPath = filepath.FromSlash(absPath)
stat, err := os.Stat(absPath)
if os.IsNotExist(err) {
return nil, FileDoesNotExistError{path: absPath}
}
return stat, err
}