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// Copyright (C) 2017 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package scanner
import (
"errors"
"fmt"
"io"
"path/filepath"
"strings"
"time"
"github.com/syncthing/syncthing/lib/fs"
"github.com/syncthing/syncthing/lib/protocol"
)
type infiniteFS struct {
fs.Filesystem
width int // number of files and directories per level
depth int // number of tree levels to simulate
filesize int64 // size of each file in bytes
}
var errNotSupp = errors.New("not supported")
func (i infiniteFS) Lstat(name string) (fs.FileInfo, error) {
return fakeInfo{name, i.filesize}, nil
}
func (i infiniteFS) Stat(name string) (fs.FileInfo, error) {
return fakeInfo{name, i.filesize}, nil
}
func (i infiniteFS) DirNames(name string) ([]string, error) {
// Returns a list of fake files and directories. Names are such that
// files appear before directories - this makes it so the scanner will
// actually see a few files without having to reach the max depth.
var names []string
for j := 0; j < i.width; j++ {
names = append(names, fmt.Sprintf("aa-file-%d", j))
}
if len(fs.PathComponents(name)) < i.depth {
for j := 0; j < i.width; j++ {
names = append(names, fmt.Sprintf("zz-dir-%d", j))
}
}
return names, nil
}
func (i infiniteFS) Open(name string) (fs.File, error) {
return &fakeFile{name, i.filesize, 0}, nil
}
func (infiniteFS) PlatformData(_ string, _, _ bool, _ fs.XattrFilter) (protocol.PlatformData, error) {
return protocol.PlatformData{}, nil
}
type singleFileFS struct {
fs.Filesystem
name string
filesize int64
}
func (s singleFileFS) Lstat(name string) (fs.FileInfo, error) {
switch name {
case ".":
return fakeInfo{".", 0}, nil
case s.name:
return fakeInfo{s.name, s.filesize}, nil
default:
return nil, errors.New("no such file")
}
}
func (s singleFileFS) Stat(name string) (fs.FileInfo, error) {
switch name {
case ".":
return fakeInfo{".", 0}, nil
case s.name:
return fakeInfo{s.name, s.filesize}, nil
default:
return nil, errors.New("no such file")
}
}
func (s singleFileFS) DirNames(name string) ([]string, error) {
if name != "." {
return nil, errors.New("no such file")
}
return []string{s.name}, nil
}
func (s singleFileFS) Open(name string) (fs.File, error) {
if name != s.name {
return nil, errors.New("no such file")
}
return &fakeFile{s.name, s.filesize, 0}, nil
}
func (singleFileFS) Options() []fs.Option {
return nil
}
func (singleFileFS) PlatformData(_ string, _, _ bool, _ fs.XattrFilter) (protocol.PlatformData, error) {
return protocol.PlatformData{}, nil
}
type fakeInfo struct {
name string
size int64
}
func (f fakeInfo) Name() string { return f.name }
func (fakeInfo) Mode() fs.FileMode { return 0755 }
func (f fakeInfo) Size() int64 { return f.size }
func (fakeInfo) ModTime() time.Time { return time.Unix(1234567890, 0) }
func (f fakeInfo) IsDir() bool {
return strings.Contains(filepath.Base(f.name), "dir") || f.name == "."
}
func (f fakeInfo) IsRegular() bool { return !f.IsDir() }
func (fakeInfo) IsSymlink() bool { return false }
func (fakeInfo) Owner() int { return 0 }
func (fakeInfo) Group() int { return 0 }
func (fakeInfo) Sys() interface{} { return nil }
func (fakeInfo) InodeChangeTime() time.Time { return time.Time{} }
type fakeFile struct {
name string
size int64
readOffset int64
}
func (f *fakeFile) Name() string {
return f.name
}
func (f *fakeFile) Read(bs []byte) (int, error) {
remaining := f.size - f.readOffset
if remaining == 0 {
return 0, io.EOF
}
if remaining < int64(len(bs)) {
f.readOffset = f.size
return int(remaining), nil
}
f.readOffset += int64(len(bs))
return len(bs), nil
}
func (f *fakeFile) Stat() (fs.FileInfo, error) {
return fakeInfo{f.name, f.size}, nil
}
func (*fakeFile) Write([]byte) (int, error) { return 0, errNotSupp }
func (*fakeFile) WriteAt([]byte, int64) (int, error) { return 0, errNotSupp }
func (*fakeFile) Close() error { return nil }
func (*fakeFile) Truncate(_ int64) error { return errNotSupp }
func (*fakeFile) ReadAt([]byte, int64) (int, error) { return 0, errNotSupp }
func (*fakeFile) Seek(int64, int) (int64, error) { return 0, errNotSupp }
func (*fakeFile) Sync() error { return nil }
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