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// Copyright 2026 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package aflow
import (
"bytes"
"fmt"
"os"
"path/filepath"
"testing"
"time"
"github.com/google/syzkaller/pkg/osutil"
"github.com/stretchr/testify/require"
)
func TestCache(t *testing.T) {
var mockedTime time.Time
timeNow := func() time.Time {
return mockedTime
}
tempDir := t.TempDir()
c, err := newTestCache(t, tempDir, 1<<40, timeNow)
require.NoError(t, err)
dir1, err := c.Create("foo", "1", func(dir string) error {
return osutil.WriteFile(filepath.Join(dir, "bar"), []byte("abc"))
})
require.NoError(t, err)
data, err := os.ReadFile(filepath.Join(dir1, "bar"))
require.NoError(t, err)
require.Equal(t, data, []byte("abc"))
c.Release(dir1)
dir2, err := c.Create("foo", "1", func(dir string) error {
t.Fatal("must not be called")
return nil
})
require.NoError(t, err)
require.Equal(t, dir2, dir1)
data, err = os.ReadFile(filepath.Join(dir2, "bar"))
require.NoError(t, err)
require.Equal(t, data, []byte("abc"))
c.Release(dir2)
dir3, err := c.Create("foo", "2", func(dir string) error {
return osutil.WriteFile(filepath.Join(dir, "baz"), []byte("def"))
})
require.NoError(t, err)
require.NotEqual(t, dir3, dir1)
data, err = os.ReadFile(filepath.Join(dir3, "baz"))
require.NoError(t, err)
require.Equal(t, data, []byte("def"))
c.Release(dir3)
failedDir := ""
dir4, err := c.Create("foo", "3", func(dir string) error {
failedDir = dir
return fmt.Errorf("failed")
})
require.Error(t, err)
require.Empty(t, dir4)
require.False(t, osutil.IsExist(failedDir))
// Create a new cache, it should pick up the state from disk.
c, err = newTestCache(t, tempDir, 1<<40, timeNow)
require.NoError(t, err)
dir5, err := c.Create("foo", "1", func(dir string) error {
t.Fatal("must not be called")
return nil
})
require.NoError(t, err)
require.Equal(t, dir5, dir1)
data, err = os.ReadFile(filepath.Join(dir5, "bar"))
require.NoError(t, err)
require.Equal(t, data, []byte("abc"))
c.Release(dir5)
// Model an incomplete dir without metadata, it should be removed.
strayDir := filepath.Join(tempDir, "a", "b")
require.NoError(t, osutil.MkdirAll(strayDir))
require.NoError(t, osutil.WriteFile(filepath.Join(strayDir, "foo"), []byte("foo")))
// With 0 max size everything unused should be purged.
_, err = newTestCache(t, tempDir, 0, timeNow)
require.NoError(t, err)
require.False(t, osutil.IsExist(dir1))
require.False(t, osutil.IsExist(dir3))
require.False(t, osutil.IsExist(strayDir))
// Test incremental purging of files.
c, err = newTestCache(t, tempDir, 100<<10, timeNow)
require.NoError(t, err)
mockedTime = mockedTime.Add(time.Minute)
dir6, err := c.Create("foo", "1", func(dir string) error {
return osutil.WriteFile(filepath.Join(dir, "bar"), bytes.Repeat([]byte{'a'}, 5<<10))
})
require.NoError(t, err)
c.Release(dir6)
mockedTime = mockedTime.Add(time.Minute)
dir7, err := c.Create("foo", "2", func(dir string) error {
return osutil.WriteFile(filepath.Join(dir, "bar"), bytes.Repeat([]byte{'a'}, 5<<10))
})
require.NoError(t, err)
c.Release(dir7)
mockedTime = mockedTime.Add(time.Minute)
dir8, err := c.Create("foo", "3", func(dir string) error {
return osutil.WriteFile(filepath.Join(dir, "bar"), bytes.Repeat([]byte{'a'}, 60<<10))
})
require.NoError(t, err)
c.Release(dir8)
// Force update of the last access time for the first dir.
mockedTime = mockedTime.Add(time.Minute)
dir9, err := c.Create("foo", "1", func(dir string) error {
t.Fatal("must not be called")
return nil
})
require.NoError(t, err)
require.Equal(t, dir6, dir9)
c.Release(dir9)
// Both dirs should exist since they should fit into cache size.
require.True(t, osutil.IsExist(dir6))
require.True(t, osutil.IsExist(dir7))
require.True(t, osutil.IsExist(dir8))
mockedTime = mockedTime.Add(time.Minute)
dir10, err := c.Create("foo", "4", func(dir string) error {
return osutil.WriteFile(filepath.Join(dir, "bar"), bytes.Repeat([]byte{'a'}, 60<<10))
})
require.NoError(t, err)
c.Release(dir10)
// Two oldest dirs should be purged.
require.True(t, osutil.IsExist(dir6))
require.False(t, osutil.IsExist(dir7))
require.False(t, osutil.IsExist(dir8))
require.True(t, osutil.IsExist(dir10))
}
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