118 lines
2.6 KiB
Go
118 lines
2.6 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information.
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package asset
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import (
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"bytes"
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"errors"
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"net/http"
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"os"
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"path"
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"time"
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)
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var _ http.FileSystem = (*InmemoryFileSystem)(nil)
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// InmemoryFileSystem defines an inmemory http.FileSystem.
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type InmemoryFileSystem struct {
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Root *Asset
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Index map[string]*Asset
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}
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// Inmemory creates an InmemoryFileSystem from.
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func Inmemory(root *Asset) *InmemoryFileSystem {
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fs := &InmemoryFileSystem{}
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fs.Root = root
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fs.Index = map[string]*Asset{}
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fs.reindex("/", "", root)
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return fs
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}
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// reindex inserts a node to the index.
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func (fs *InmemoryFileSystem) reindex(prefix, name string, file *Asset) {
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fs.Index[path.Join(prefix, name)] = file
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for _, child := range file.Children {
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fs.reindex(path.Join(prefix, name), child.Name, child)
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}
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}
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// Open opens the file at the specified path.
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func (fs *InmemoryFileSystem) Open(path string) (http.File, error) {
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asset, ok := fs.Index[path]
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if !ok {
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return nil, os.ErrNotExist
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}
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return asset.File(), nil
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}
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// File opens the particular asset as a file.
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func (asset *Asset) File() *File {
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return &File{*bytes.NewReader(asset.Data), asset}
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}
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// File defines a readable file.
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type File struct {
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bytes.Reader
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*Asset
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}
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// Readdir reads all file infos from the directory.
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func (file *File) Readdir(count int) ([]os.FileInfo, error) {
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if !file.Mode.IsDir() {
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return nil, errors.New("not a directory")
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}
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if count > len(file.Children) {
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count = len(file.Children)
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}
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infos := make([]os.FileInfo, 0, count)
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for _, child := range file.Children {
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infos = append(infos, child.stat())
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}
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return infos, nil
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}
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func (asset *Asset) stat() FileInfo {
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return FileInfo{
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name: asset.Name,
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size: int64(len(asset.Data)),
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mode: asset.Mode,
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modTime: asset.ModTime,
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}
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}
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// Stat returns stats about the file.
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func (file *File) Stat() (os.FileInfo, error) { return file.stat(), nil }
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// Close closes the file.
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func (file *File) Close() error { return nil }
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// FileInfo implements file info.
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type FileInfo struct {
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name string
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size int64
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mode os.FileMode
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modTime time.Time
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}
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// Name implements os.FileInfo.
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func (info FileInfo) Name() string { return info.name }
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// Size implements os.FileInfo.
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func (info FileInfo) Size() int64 { return info.size }
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// Mode implements os.FileInfo.
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func (info FileInfo) Mode() os.FileMode { return info.mode }
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// ModTime implements os.FileInfo.
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func (info FileInfo) ModTime() time.Time { return info.modTime }
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// IsDir implements os.FileInfo.
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func (info FileInfo) IsDir() bool { return info.mode.IsDir() }
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// Sys implements os.FileInfo.
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func (info FileInfo) Sys() interface{} { return nil }
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