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// Copyright 2019 the Go-FUSE Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package fs
import (
"bytes"
"context"
"fmt"
"io/ioutil"
"sync"
"syscall"
"testing"
"github.com/hanwen/go-fuse/v2/fuse"
)
type keepCacheFile struct {
Inode
keepCache bool
mu sync.Mutex
content []byte
count int
}
var _ = (NodeReader)((*keepCacheFile)(nil))
var _ = (NodeOpener)((*keepCacheFile)(nil))
var _ = (NodeGetattrer)((*keepCacheFile)(nil))
func (f *keepCacheFile) setContent(delta int) {
f.mu.Lock()
defer f.mu.Unlock()
f.count += delta
f.content = []byte(fmt.Sprintf("%010x", f.count))
}
func (f *keepCacheFile) Open(ctx context.Context, flags uint32) (FileHandle, uint32, syscall.Errno) {
var fl uint32
if f.keepCache {
fl = fuse.FOPEN_KEEP_CACHE
}
f.setContent(0)
return nil, fl, OK
}
func (f *keepCacheFile) Getattr(ctx context.Context, fh FileHandle, out *fuse.AttrOut) syscall.Errno {
f.mu.Lock()
defer f.mu.Unlock()
out.Size = uint64(len(f.content))
return OK
}
func (f *keepCacheFile) Read(ctx context.Context, fh FileHandle, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
f.setContent(1)
f.mu.Lock()
defer f.mu.Unlock()
return fuse.ReadResultData(f.content[off:]), OK
}
type keepCacheRoot struct {
Inode
keep, nokeep *keepCacheFile
}
var _ = (NodeOnAdder)((*keepCacheRoot)(nil))
func (r *keepCacheRoot) OnAdd(ctx context.Context) {
i := &r.Inode
r.keep = &keepCacheFile{
keepCache: true,
}
r.keep.setContent(0)
i.AddChild("keep", i.NewInode(ctx, r.keep, StableAttr{}), true)
r.nokeep = &keepCacheFile{
keepCache: false,
}
r.nokeep.setContent(0)
i.AddChild("nokeep", i.NewInode(ctx, r.nokeep, StableAttr{}), true)
}
// Test FOPEN_KEEP_CACHE. This is a little subtle: the automatic cache
// invalidation triggers if mtime or file size is changed, so only
// change content but no metadata.
func TestKeepCache(t *testing.T) {
root := &keepCacheRoot{}
mntDir, _, clean := testMount(t, root, nil)
defer clean()
c1, err := ioutil.ReadFile(mntDir + "/keep")
if err != nil {
t.Fatalf("read keep 1: %v", err)
}
c2, err := ioutil.ReadFile(mntDir + "/keep")
if err != nil {
t.Fatalf("read keep 2: %v", err)
}
if bytes.Compare(c1, c2) != 0 {
t.Errorf("keep read 2 got %q want read 1 %q", c2, c1)
}
if s := root.keep.Inode.NotifyContent(0, 100); s != OK {
t.Errorf("NotifyContent: %v", s)
}
c3, err := ioutil.ReadFile(mntDir + "/keep")
if err != nil {
t.Fatalf("read keep 3: %v", err)
}
if bytes.Compare(c2, c3) == 0 {
t.Errorf("keep read 3 got %q want different", c3)
}
nc1, err := ioutil.ReadFile(mntDir + "/nokeep")
if err != nil {
t.Fatalf("read keep 1: %v", err)
}
nc2, err := ioutil.ReadFile(mntDir + "/nokeep")
if err != nil {
t.Fatalf("read keep 2: %v", err)
}
if bytes.Compare(nc1, nc2) == 0 {
t.Errorf("nokeep read 2 got %q want read 1 %q", c2, c1)
}
}
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