mirror of
https://github.com/octoleo/restic.git
synced 2024-11-16 01:57:10 +00:00
113 lines
2.3 KiB
Go
113 lines
2.3 KiB
Go
package repository
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import (
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"context"
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"io"
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"math/rand"
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"sync"
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"testing"
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"github.com/restic/restic/internal/crypto"
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"github.com/restic/restic/internal/restic"
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"github.com/restic/restic/internal/test"
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)
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func randomID(rd io.Reader) restic.ID {
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id := restic.ID{}
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_, err := io.ReadFull(rd, id[:])
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if err != nil {
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panic(err)
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}
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return id
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}
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const maxBlobSize = 1 << 20
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func fillPacks(t testing.TB, rnd *rand.Rand, pm *packerManager, buf []byte) (bytes int) {
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for i := 0; i < 102; i++ {
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l := rnd.Intn(maxBlobSize)
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id := randomID(rnd)
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buf = buf[:l]
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// Only change a few bytes so we know we're not benchmarking the RNG.
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rnd.Read(buf[:min(l, 4)])
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n, err := pm.SaveBlob(context.TODO(), restic.DataBlob, id, buf, 0)
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if err != nil {
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t.Fatal(err)
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}
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if n != l+37 && n != l+37+36 {
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t.Errorf("Add() returned invalid number of bytes: want %v, got %v", l, n)
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}
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bytes += n
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}
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err := pm.Flush(context.TODO())
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if err != nil {
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t.Fatal(err)
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}
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return bytes
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}
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const randomSeed = 23
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var (
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once sync.Once
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totalSize int64
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)
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func TestPackerManager(t *testing.T) {
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bytes := testPackerManager(t)
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once.Do(func() { totalSize = bytes })
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}
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func testPackerManager(t testing.TB) int64 {
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rnd := rand.New(rand.NewSource(randomSeed))
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savedBytes := int(0)
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pm := newPackerManager(crypto.NewRandomKey(), restic.DataBlob, DefaultPackSize, func(ctx context.Context, tp restic.BlobType, p *Packer) error {
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err := p.Finalize()
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if err != nil {
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return err
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}
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savedBytes += int(p.Size())
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return nil
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})
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blobBuf := make([]byte, maxBlobSize)
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bytes := fillPacks(t, rnd, pm, blobBuf)
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// bytes does not include the last packs header
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test.Equals(t, savedBytes, bytes+36)
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t.Logf("saved %d bytes", bytes)
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return int64(bytes)
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}
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func BenchmarkPackerManager(t *testing.B) {
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// Run testPackerManager if it hasn't run already, to set totalSize.
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once.Do(func() {
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totalSize = testPackerManager(t)
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})
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rnd := rand.New(rand.NewSource(randomSeed))
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blobBuf := make([]byte, maxBlobSize)
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t.ReportAllocs()
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t.SetBytes(totalSize)
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t.ResetTimer()
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for i := 0; i < t.N; i++ {
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rnd.Seed(randomSeed)
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pm := newPackerManager(crypto.NewRandomKey(), restic.DataBlob, DefaultPackSize, func(ctx context.Context, t restic.BlobType, p *Packer) error {
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return nil
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})
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fillPacks(t, rnd, pm, blobBuf)
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}
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}
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