restic/internal/repository/packer_manager_test.go

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package repository
import (
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"context"
"io"
"math/rand"
"os"
"testing"
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"github.com/restic/restic/internal/backend/mem"
"github.com/restic/restic/internal/crypto"
"github.com/restic/restic/internal/fs"
"github.com/restic/restic/internal/mock"
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"github.com/restic/restic/internal/restic"
)
type randReader struct {
src rand.Source
rand *rand.Rand
}
func newRandReader(src rand.Source) *randReader {
return &randReader{
src: src,
rand: rand.New(src),
}
}
// Read generates len(p) random bytes and writes them into p. It
// always returns len(p) and a nil error.
func (r *randReader) Read(p []byte) (n int, err error) {
for i := 0; i < len(p); i += 7 {
val := r.src.Int63()
for j := 0; i+j < len(p) && j < 7; j++ {
p[i+j] = byte(val)
val >>= 8
}
}
return len(p), nil
}
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func randomID(rd io.Reader) restic.ID {
id := restic.ID{}
_, err := io.ReadFull(rd, id[:])
if err != nil {
panic(err)
}
return id
}
const maxBlobSize = 1 << 20
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func saveFile(t testing.TB, be Saver, f *os.File, id restic.ID) {
h := restic.Handle{Type: restic.DataFile, Name: id.String()}
t.Logf("save file %v", h)
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if err := be.Save(context.TODO(), h, f); err != nil {
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t.Fatal(err)
}
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if err := f.Close(); err != nil {
t.Fatal(err)
}
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if err := fs.RemoveIfExists(f.Name()); err != nil {
t.Fatal(err)
}
}
func fillPacks(t testing.TB, rnd *randReader, be Saver, pm *packerManager, buf []byte) (bytes int) {
for i := 0; i < 100; i++ {
l := rnd.rand.Intn(1 << 20)
seed := rnd.rand.Int63()
packer, err := pm.findPacker(uint(l))
if err != nil {
t.Fatal(err)
}
rd := newRandReader(rand.NewSource(seed))
id := randomID(rd)
buf = buf[:l]
_, err = io.ReadFull(rd, buf)
if err != nil {
t.Fatal(err)
}
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n, err := packer.Add(restic.DataBlob, id, buf)
if n != l {
t.Errorf("Add() returned invalid number of bytes: want %v, got %v", n, l)
}
bytes += l
if packer.Size() < minPackSize && pm.countPacker() < maxPackers {
pm.insertPacker(packer)
continue
}
_, err = packer.Finalize()
if err != nil {
t.Fatal(err)
}
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if _, err = packer.tmpfile.Seek(0, 0); err != nil {
t.Fatal(err)
}
packID := restic.IDFromHash(packer.hw.Sum(nil))
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saveFile(t, be, packer.tmpfile, packID)
}
return bytes
}
func flushRemainingPacks(t testing.TB, rnd *randReader, be Saver, pm *packerManager) (bytes int) {
if pm.countPacker() > 0 {
for _, packer := range pm.packers {
n, err := packer.Finalize()
if err != nil {
t.Fatal(err)
}
bytes += int(n)
packID := restic.IDFromHash(packer.hw.Sum(nil))
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saveFile(t, be, packer.tmpfile, packID)
}
}
return bytes
}
func TestPackerManager(t *testing.T) {
rnd := newRandReader(rand.NewSource(23))
be := mem.New()
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pm := newPackerManager(be, crypto.NewRandomKey())
blobBuf := make([]byte, maxBlobSize)
bytes := fillPacks(t, rnd, be, pm, blobBuf)
bytes += flushRemainingPacks(t, rnd, be, pm)
t.Logf("saved %d bytes", bytes)
}
func BenchmarkPackerManager(t *testing.B) {
rnd := newRandReader(rand.NewSource(23))
be := &mock.Backend{
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SaveFn: func(context.Context, restic.Handle, io.Reader) error { return nil },
}
blobBuf := make([]byte, maxBlobSize)
t.ResetTimer()
for i := 0; i < t.N; i++ {
bytes := 0
pm := newPackerManager(be, crypto.NewRandomKey())
bytes += fillPacks(t, rnd, be, pm, blobBuf)
bytes += flushRemainingPacks(t, rnd, be, pm)
t.Logf("saved %d bytes", bytes)
}
}