storj/cmd/uplinkng/ultest/filesystem.go

337 lines
7.0 KiB
Go
Raw Normal View History

// Copyright (C) 2021 Storj Labs, Inc.
// See LICENSE for copying information.
package ultest
import (
"bytes"
"context"
"path/filepath"
"sort"
"strings"
"time"
"github.com/zeebo/clingy"
"github.com/zeebo/errs"
"storj.io/storj/cmd/uplinkng/ulfs"
"storj.io/storj/cmd/uplinkng/ulloc"
)
//
// ulfs.Filesystem
//
type testFilesystem struct {
stdin string
created int64
files map[ulloc.Location]memFileData
pending map[ulloc.Location][]*memWriteHandle
locals map[string]bool // true means path is a directory
buckets map[string]struct{}
}
func newTestFilesystem() *testFilesystem {
return &testFilesystem{
files: make(map[ulloc.Location]memFileData),
pending: make(map[ulloc.Location][]*memWriteHandle),
locals: make(map[string]bool),
buckets: make(map[string]struct{}),
}
}
type memFileData struct {
contents string
created int64
}
func (tfs *testFilesystem) ensureBucket(name string) {
tfs.buckets[name] = struct{}{}
}
func (tfs *testFilesystem) Files() (files []File) {
for loc, mf := range tfs.files {
files = append(files, File{
Loc: loc.String(),
Contents: mf.contents,
})
}
sort.Slice(files, func(i, j int) bool { return files[i].less(files[j]) })
return files
}
func (tfs *testFilesystem) Close() error {
return nil
}
func (tfs *testFilesystem) Open(ctx clingy.Context, loc ulloc.Location) (_ ulfs.ReadHandle, err error) {
if loc.Std() {
return &byteReadHandle{Buffer: bytes.NewBufferString("-")}, nil
}
mf, ok := tfs.files[loc]
if !ok {
return nil, errs.New("file does not exist")
}
return &byteReadHandle{Buffer: bytes.NewBufferString(mf.contents)}, nil
}
func (tfs *testFilesystem) Create(ctx clingy.Context, loc ulloc.Location) (_ ulfs.WriteHandle, err error) {
if loc.Std() {
return new(discardWriteHandle), nil
}
if bucket, _, ok := loc.RemoteParts(); ok {
if _, ok := tfs.buckets[bucket]; !ok {
return nil, errs.New("bucket %q does not exist", bucket)
}
}
if path, ok := loc.LocalParts(); ok {
if loc.Directoryish() || tfs.IsLocalDir(ctx, loc) {
return nil, errs.New("unable to open file for writing: %q", loc)
}
if err := tfs.mkdirAll(ctx, filepath.Dir(path)); err != nil {
return nil, err
}
}
tfs.created++
wh := &memWriteHandle{
buf: bytes.NewBuffer(nil),
loc: loc,
tfs: tfs,
cre: tfs.created,
}
tfs.pending[loc] = append(tfs.pending[loc], wh)
return wh, nil
}
func (tfs *testFilesystem) Remove(ctx context.Context, loc ulloc.Location) error {
delete(tfs.files, loc)
return nil
}
func (tfs *testFilesystem) ListObjects(ctx context.Context, prefix ulloc.Location, recursive bool) (ulfs.ObjectIterator, error) {
prefixDir := prefix.AsDirectoryish()
var infos []ulfs.ObjectInfo
for loc, mf := range tfs.files {
if loc.HasPrefix(prefixDir) || loc == prefix {
infos = append(infos, ulfs.ObjectInfo{
Loc: loc,
Created: time.Unix(mf.created, 0),
})
}
}
sort.Sort(objectInfos(infos))
if !recursive {
infos = collapseObjectInfos(prefix, infos)
}
return &objectInfoIterator{infos: infos}, nil
}
func (tfs *testFilesystem) ListUploads(ctx context.Context, prefix ulloc.Location, recursive bool) (ulfs.ObjectIterator, error) {
prefixDir := prefix.AsDirectoryish()
var infos []ulfs.ObjectInfo
for loc, whs := range tfs.pending {
if loc.Remote() && loc.HasPrefix(prefixDir) || loc == prefix {
for _, wh := range whs {
infos = append(infos, ulfs.ObjectInfo{
Loc: loc,
Created: time.Unix(wh.cre, 0),
})
}
}
}
sort.Sort(objectInfos(infos))
if !recursive {
infos = collapseObjectInfos(prefix, infos)
}
return &objectInfoIterator{infos: infos}, nil
}
func (tfs *testFilesystem) IsLocalDir(ctx context.Context, loc ulloc.Location) (local bool) {
path, ok := loc.LocalParts()
return ok && (filepath.Clean(path) == "." || tfs.locals[path])
}
func (tfs *testFilesystem) mkdirAll(ctx context.Context, dir string) error {
i := 0
for i < len(dir) {
slash := strings.Index(dir[i:], "/")
if slash == -1 {
break
}
if err := tfs.mkdir(ctx, dir[:i+slash]); err != nil {
return err
}
i += slash + 1
}
if len(dir) > 0 {
return tfs.mkdir(ctx, dir)
}
return nil
}
func (tfs *testFilesystem) mkdir(ctx context.Context, dir string) error {
if isDir, ok := tfs.locals[dir]; ok && !isDir {
return errs.New("cannot create directory: %q is a file", dir)
}
tfs.locals[dir] = true
return nil
}
//
// ulfs.ReadHandle
//
type byteReadHandle struct {
*bytes.Buffer
}
func (b *byteReadHandle) Close() error { return nil }
func (b *byteReadHandle) Info() ulfs.ObjectInfo { return ulfs.ObjectInfo{} }
//
// ulfs.WriteHandle
//
type memWriteHandle struct {
buf *bytes.Buffer
loc ulloc.Location
tfs *testFilesystem
cre int64
done bool
}
func (b *memWriteHandle) Write(p []byte) (int, error) {
return b.buf.Write(p)
}
func (b *memWriteHandle) Commit() error {
if err := b.close(); err != nil {
return err
}
if path, ok := b.loc.LocalParts(); ok {
b.tfs.locals[path] = false
}
b.tfs.files[b.loc] = memFileData{
contents: b.buf.String(),
created: b.cre,
}
return nil
}
func (b *memWriteHandle) Abort() error {
if err := b.close(); err != nil {
return err
}
return nil
}
func (b *memWriteHandle) close() error {
if b.done {
return errs.New("already done")
}
b.done = true
handles := b.tfs.pending[b.loc]
for i, v := range handles {
if v == b {
handles = append(handles[:i], handles[i+1:]...)
break
}
}
if len(handles) > 0 {
b.tfs.pending[b.loc] = handles
} else {
delete(b.tfs.pending, b.loc)
}
return nil
}
type discardWriteHandle struct{}
func (discardWriteHandle) Write(p []byte) (int, error) { return len(p), nil }
func (discardWriteHandle) Commit() error { return nil }
func (discardWriteHandle) Abort() error { return nil }
//
// ulfs.ObjectIterator
//
type objectInfoIterator struct {
infos []ulfs.ObjectInfo
current ulfs.ObjectInfo
}
func (li *objectInfoIterator) Next() bool {
if len(li.infos) == 0 {
return false
}
li.current, li.infos = li.infos[0], li.infos[1:]
return true
}
func (li *objectInfoIterator) Err() error {
return nil
}
func (li *objectInfoIterator) Item() ulfs.ObjectInfo {
return li.current
}
type objectInfos []ulfs.ObjectInfo
func (ois objectInfos) Len() int { return len(ois) }
func (ois objectInfos) Swap(i int, j int) { ois[i], ois[j] = ois[j], ois[i] }
func (ois objectInfos) Less(i int, j int) bool { return ois[i].Loc.Less(ois[j].Loc) }
func collapseObjectInfos(prefix ulloc.Location, infos []ulfs.ObjectInfo) []ulfs.ObjectInfo {
collapsing := false
current := ""
j := 0
for _, oi := range infos {
first, ok := oi.Loc.ListKeyName(prefix)
if ok {
if collapsing && first == current {
continue
}
collapsing = true
current = first
oi.IsPrefix = true
}
if bucket, _, ok := oi.Loc.RemoteParts(); ok {
oi.Loc = ulloc.NewRemote(bucket, first)
} else if _, ok := oi.Loc.LocalParts(); ok {
oi.Loc = ulloc.NewLocal(first)
} else {
panic("invalid object returned from list")
}
infos[j] = oi
j++
}
return infos[:j]
}