databricks-cli/libs/filer/workspace_files_extensions_...

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package filer
import (
"context"
"errors"
"fmt"
"io"
"io/fs"
"path"
"strings"
"github.com/databricks/cli/libs/log"
"github.com/databricks/cli/libs/notebook"
"github.com/databricks/databricks-sdk-go"
"github.com/databricks/databricks-sdk-go/service/workspace"
)
type workspaceFilesExtensionsClient struct {
workspaceClient *databricks.WorkspaceClient
wsfs Filer
root string
readonly bool
}
var extensionsToLanguages = map[string]workspace.Language{
".py": workspace.LanguagePython,
".r": workspace.LanguageR,
".scala": workspace.LanguageScala,
".sql": workspace.LanguageSql,
".ipynb": workspace.LanguagePython,
}
type workspaceFileStatus struct {
wsfsFileInfo
// Name of the file to be used in any API calls made using the workspace files
// filer. For notebooks this path does not include the extension.
nameForWorkspaceAPI string
}
func (w *workspaceFilesExtensionsClient) stat(ctx context.Context, name string) (wsfsFileInfo, error) {
info, err := w.wsfs.Stat(ctx, name)
if err != nil {
return wsfsFileInfo{}, err
}
return info.(wsfsFileInfo), err
}
// This function returns the stat for the provided notebook. The stat object itself contains the path
// with the extension since it is meant to be used in the context of a fs.FileInfo.
func (w *workspaceFilesExtensionsClient) getNotebookStatByNameWithExt(ctx context.Context, name string) (*workspaceFileStatus, error) {
ext := path.Ext(name)
nameWithoutExt := strings.TrimSuffix(name, ext)
// File name does not have an extension associated with Databricks notebooks, return early.
if _, ok := extensionsToLanguages[ext]; !ok {
return nil, nil
}
// If the file could be a notebook, check if it is and has the correct language.
stat, err := w.stat(ctx, nameWithoutExt)
if err != nil {
// If the file does not exist, return early.
if errors.As(err, &FileDoesNotExistError{}) {
return nil, nil
}
log.Debugf(ctx, "attempting to determine if %s could be a notebook. Failed to fetch the status of object at %s: %s", name, path.Join(w.root, nameWithoutExt), err)
return nil, err
}
// Not a notebook. Return early.
if stat.ObjectType != workspace.ObjectTypeNotebook {
log.Debugf(ctx, "attempting to determine if %s could be a notebook. Found an object at %s but it is not a notebook. It is a %s.", name, path.Join(w.root, nameWithoutExt), stat.ObjectType)
return nil, nil
}
// Not the correct language. Return early.
if stat.Language != extensionsToLanguages[ext] {
log.Debugf(ctx, "attempting to determine if %s could be a notebook. Found a notebook at %s but it is not of the correct language. Expected %s but found %s.", name, path.Join(w.root, nameWithoutExt), extensionsToLanguages[ext], stat.Language)
return nil, nil
}
// When the extension is .py we expect the export format to be source.
// If it's not, return early.
if ext == ".py" && stat.ReposExportFormat != workspace.ExportFormatSource {
log.Debugf(ctx, "attempting to determine if %s could be a notebook. Found a notebook at %s but it is not exported as a source notebook. Its export format is %s.", name, path.Join(w.root, nameWithoutExt), stat.ReposExportFormat)
return nil, nil
}
// When the extension is .ipynb we expect the export format to be Jupyter.
// If it's not, return early.
if ext == ".ipynb" && stat.ReposExportFormat != workspace.ExportFormatJupyter {
log.Debugf(ctx, "attempting to determine if %s could be a notebook. Found a notebook at %s but it is not exported as a Jupyter notebook. Its export format is %s.", name, path.Join(w.root, nameWithoutExt), stat.ReposExportFormat)
return nil, nil
}
// Modify the stat object path to include the extension. This stat object will be used
// to return the fs.FileInfo object in the stat method.
stat.Path = stat.Path + ext
return &workspaceFileStatus{
wsfsFileInfo: stat,
nameForWorkspaceAPI: nameWithoutExt,
}, nil
}
func (w *workspaceFilesExtensionsClient) getNotebookStatByNameWithoutExt(ctx context.Context, name string) (*workspaceFileStatus, error) {
stat, err := w.stat(ctx, name)
if err != nil {
return nil, err
}
// We expect this internal function to only be called from [ReadDir] when we are sure
// that the object is a notebook. Thus, this should never happen.
if stat.ObjectType != workspace.ObjectTypeNotebook {
return nil, fmt.Errorf("expected object at %s to be a notebook but it is a %s", path.Join(w.root, name), stat.ObjectType)
}
// Get the extension for the notebook.
ext := notebook.GetExtensionByLanguage(&stat.ObjectInfo)
// If the notebook was exported as a Jupyter notebook, the extension should be .ipynb.
if stat.Language == workspace.LanguagePython && stat.ReposExportFormat == workspace.ExportFormatJupyter {
ext = ".ipynb"
}
// Modify the stat object path to include the extension. This stat object will be used
// to return the fs.DirEntry object in the ReadDir method.
stat.Path = stat.Path + ext
return &workspaceFileStatus{
wsfsFileInfo: stat,
nameForWorkspaceAPI: name,
}, nil
}
type DuplicatePathError struct {
oi1 workspace.ObjectInfo
oi2 workspace.ObjectInfo
commonName string
}
func (e DuplicatePathError) Error() string {
return fmt.Sprintf("failed to read files from the workspace file system. Duplicate paths encountered. Both %s at %s and %s at %s resolve to the same name %s. Changing the name of one of these objects will resolve this issue", e.oi1.ObjectType, e.oi1.Path, e.oi2.ObjectType, e.oi2.Path, e.commonName)
}
type ReadOnlyError struct {
op string
}
func (e ReadOnlyError) Error() string {
return fmt.Sprintf("failed to %s: filer is in read-only mode", e.op)
}
// This is a filer for the workspace file system that allows you to pretend the
// workspace file system is a traditional file system. It allows you to list, read, write,
// delete, and stat notebooks (and files in general) in the workspace, using their paths
// with the extension included.
//
// The ReadDir method returns a DuplicatePathError if this traditional file system view is
// not possible. For example, a Python notebook called foo and a Python file called `foo.py`
// would resolve to the same path `foo.py` in a tradition file system.
//
// Users of this filer should be careful when using the Write and Mkdir methods.
// The underlying import API we use to upload notebooks and files returns opaque internal
// errors for namespace clashes (e.g. a file and a notebook or a directory and a notebook).
// Thus users of these methods should be careful to avoid such clashes.
func NewWorkspaceFilesExtensionsClient(w *databricks.WorkspaceClient, root string) (Filer, error) {
return newWorkspaceFilesExtensionsClient(w, root, false)
}
func NewReadOnlyWorkspaceFilesExtensionsClient(w *databricks.WorkspaceClient, root string) (Filer, error) {
return newWorkspaceFilesExtensionsClient(w, root, true)
}
func newWorkspaceFilesExtensionsClient(w *databricks.WorkspaceClient, root string, readonly bool) (Filer, error) {
filer, err := NewWorkspaceFilesClient(w, root)
if err != nil {
return nil, err
}
if readonly {
// Wrap in a readahead cache to avoid making unnecessary calls to the workspace.
filer = newWorkspaceFilesReadaheadCache(filer)
}
return &workspaceFilesExtensionsClient{
workspaceClient: w,
wsfs: filer,
root: root,
readonly: readonly,
}, nil
}
func (w *workspaceFilesExtensionsClient) ReadDir(ctx context.Context, name string) ([]fs.DirEntry, error) {
entries, err := w.wsfs.ReadDir(ctx, name)
if err != nil {
return nil, err
}
seenPaths := make(map[string]workspace.ObjectInfo)
for i := range entries {
info, err := entries[i].Info()
if err != nil {
return nil, err
}
sysInfo := info.Sys().(workspace.ObjectInfo)
// If the object is a notebook, include an extension in the entry.
if sysInfo.ObjectType == workspace.ObjectTypeNotebook {
stat, err := w.getNotebookStatByNameWithoutExt(ctx, path.Join(name, entries[i].Name()))
if err != nil {
return nil, err
}
// Replace the entry with the new entry that includes the extension.
entries[i] = wsfsDirEntry{wsfsFileInfo{ObjectInfo: stat.ObjectInfo}}
}
// Error if we have seen this path before in the current directory.
// If not seen before, add it to the seen paths.
if _, ok := seenPaths[entries[i].Name()]; ok {
return nil, DuplicatePathError{
oi1: seenPaths[entries[i].Name()],
oi2: sysInfo,
commonName: path.Join(name, entries[i].Name()),
}
}
seenPaths[entries[i].Name()] = sysInfo
}
return entries, nil
}
// Note: The import API returns opaque internal errors for namespace clashes
// (e.g. a file and a notebook or a directory and a notebook). Thus users of this
// method should be careful to avoid such clashes.
func (w *workspaceFilesExtensionsClient) Write(ctx context.Context, name string, reader io.Reader, mode ...WriteMode) error {
if w.readonly {
return ReadOnlyError{"write"}
}
return w.wsfs.Write(ctx, name, reader, mode...)
}
// Try to read the file as a regular file. If the file is not found, try to read it as a notebook.
func (w *workspaceFilesExtensionsClient) Read(ctx context.Context, name string) (io.ReadCloser, error) {
r, err := w.wsfs.Read(ctx, name)
// If the file is not found, it might be a notebook.
if errors.As(err, &FileDoesNotExistError{}) {
stat, serr := w.getNotebookStatByNameWithExt(ctx, name)
if serr != nil {
// Unable to stat. Return the stat error.
return nil, serr
}
if stat == nil {
// Not a notebook. Return the original error.
return nil, err
}
// The workspace files filer performs an additional stat call to make sure
// the path is not a directory. We can skip this step since we already have
// the stat object and know that the path is a notebook.
return w.workspaceClient.Workspace.Download(
ctx,
path.Join(w.root, stat.nameForWorkspaceAPI),
workspace.DownloadFormat(stat.ReposExportFormat),
)
}
return r, err
}
// Try to delete the file as a regular file. If the file is not found, try to delete it as a notebook.
func (w *workspaceFilesExtensionsClient) Delete(ctx context.Context, name string, mode ...DeleteMode) error {
if w.readonly {
return ReadOnlyError{"delete"}
}
err := w.wsfs.Delete(ctx, name, mode...)
// If the file is not found, it might be a notebook.
if errors.As(err, &FileDoesNotExistError{}) {
stat, serr := w.getNotebookStatByNameWithExt(ctx, name)
if serr != nil {
// Unable to stat. Return the stat error.
return serr
}
if stat == nil {
// Not a notebook. Return the original error.
return err
}
return w.wsfs.Delete(ctx, stat.nameForWorkspaceAPI, mode...)
}
return err
}
// Try to stat the file as a regular file. If the file is not found, try to stat it as a notebook.
func (w *workspaceFilesExtensionsClient) Stat(ctx context.Context, name string) (fs.FileInfo, error) {
info, err := w.wsfs.Stat(ctx, name)
// If the file is not found, it might be a notebook.
if errors.As(err, &FileDoesNotExistError{}) {
stat, serr := w.getNotebookStatByNameWithExt(ctx, name)
if serr != nil {
// Unable to stat. Return the stat error.
return nil, serr
}
if stat == nil {
// Not a notebook. Return the original error.
return nil, err
}
return wsfsFileInfo{ObjectInfo: stat.ObjectInfo}, nil
}
return info, err
}
// Note: The import API returns opaque internal errors for namespace clashes
// (e.g. a file and a notebook or a directory and a notebook). Thus users of this
// method should be careful to avoid such clashes.
func (w *workspaceFilesExtensionsClient) Mkdir(ctx context.Context, name string) error {
if w.readonly {
return ReadOnlyError{"mkdir"}
}
return w.wsfs.Mkdir(ctx, name)
}