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// Copyright 2018 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package statefile
import (
"bytes"
crand "crypto/rand"
"encoding/base64"
"io"
"math/rand"
"testing"
"gvisor.googlesource.com/gvisor/pkg/hashio"
)
func randomKey() ([]byte, error) {
r := make([]byte, base64.RawStdEncoding.DecodedLen(keySize))
if _, err := io.ReadFull(crand.Reader, r); err != nil {
return nil, err
}
key := make([]byte, keySize)
base64.RawStdEncoding.Encode(key, r)
return key, nil
}
type testCase struct {
name string
data []byte
metadata map[string]string
}
func TestStatefile(t *testing.T) {
cases := []testCase{
// Various data sizes.
{"nil", nil, nil},
{"empty", []byte(""), nil},
{"some", []byte("_"), nil},
{"one", []byte("0"), nil},
{"two", []byte("01"), nil},
{"three", []byte("012"), nil},
{"four", []byte("0123"), nil},
{"five", []byte("01234"), nil},
{"six", []byte("012356"), nil},
{"seven", []byte("0123567"), nil},
{"eight", []byte("01235678"), nil},
// Make sure we have one longer than the hash length.
{"longer than hash", []byte("012356asdjflkasjlk3jlk23j4lkjaso0d789f0aujw3lkjlkxsdf78asdful2kj3ljka78"), nil},
// Make sure we have one longer than the segment size.
{"segments", make([]byte, 3*hashio.SegmentSize), nil},
{"segments minus one", make([]byte, 3*hashio.SegmentSize-1), nil},
{"segments plus one", make([]byte, 3*hashio.SegmentSize+1), nil},
{"segments minus hash", make([]byte, 3*hashio.SegmentSize-32), nil},
{"segments plus hash", make([]byte, 3*hashio.SegmentSize+32), nil},
{"large", make([]byte, 30*hashio.SegmentSize), nil},
// Different metadata.
{"one metadata", []byte("data"), map[string]string{"foo": "bar"}},
{"two metadata", []byte("data"), map[string]string{"foo": "bar", "one": "two"}},
}
for _, c := range cases {
// Generate a key.
integrityKey, err := randomKey()
if err != nil {
t.Errorf("can't generate key: got %v, excepted nil", err)
continue
}
t.Run(c.name, func(t *testing.T) {
for _, key := range [][]byte{nil, integrityKey} {
t.Run("key="+string(key), func(t *testing.T) {
// Encoding happens via a buffer.
var bufEncoded bytes.Buffer
var bufDecoded bytes.Buffer
// Do all the writing.
w, err := NewWriter(&bufEncoded, key, c.metadata)
if err != nil {
t.Fatalf("error creating writer: got %v, expected nil", err)
}
if _, err := io.Copy(w, bytes.NewBuffer(c.data)); err != nil {
t.Fatalf("error during write: got %v, expected nil", err)
}
// Finish the sum.
if err := w.Close(); err != nil {
t.Fatalf("error during close: got %v, expected nil", err)
}
t.Logf("original data: %d bytes, encoded: %d bytes.",
len(c.data), len(bufEncoded.Bytes()))
// Do all the reading.
r, metadata, err := NewReader(bytes.NewReader(bufEncoded.Bytes()), key)
if err != nil {
t.Fatalf("error creating reader: got %v, expected nil", err)
}
if _, err := io.Copy(&bufDecoded, r); err != nil {
t.Fatalf("error during read: got %v, expected nil", err)
}
// Check that the data matches.
if !bytes.Equal(c.data, bufDecoded.Bytes()) {
t.Fatalf("data didn't match (%d vs %d bytes)", len(bufDecoded.Bytes()), len(c.data))
}
// Check that the metadata matches.
for k, v := range c.metadata {
nv, ok := metadata[k]
if !ok {
t.Fatalf("missing metadata: %s", k)
}
if v != nv {
t.Fatalf("mismatched metdata for %s: got %s, expected %s", k, nv, v)
}
}
// Change the data and verify that it fails.
b := append([]byte(nil), bufEncoded.Bytes()...)
b[rand.Intn(len(b))]++
r, _, err = NewReader(bytes.NewReader(b), key)
if err == nil {
_, err = io.Copy(&bufDecoded, r)
}
if err == nil {
t.Error("got no error: expected error on data corruption")
}
// Change the key and verify that it fails.
if key == nil {
key = integrityKey
} else {
key[rand.Intn(len(key))]++
}
r, _, err = NewReader(bytes.NewReader(bufEncoded.Bytes()), key)
if err == nil {
_, err = io.Copy(&bufDecoded, r)
}
if err != hashio.ErrHashMismatch {
t.Errorf("got error: %v, expected ErrHashMismatch on key mismatch", err)
}
})
}
})
}
}
const benchmarkDataSize = 10 * 1024 * 1024
func benchmark(b *testing.B, size int, write bool, compressible bool) {
b.StopTimer()
b.SetBytes(benchmarkDataSize)
// Generate source data.
var source []byte
if compressible {
// For compressible data, we use essentially all zeros.
source = make([]byte, benchmarkDataSize)
} else {
// For non-compressible data, we use random base64 data (to
// make it marginally compressible, a ratio of 75%).
var sourceBuf bytes.Buffer
bufW := base64.NewEncoder(base64.RawStdEncoding, &sourceBuf)
bufR := rand.New(rand.NewSource(0))
if _, err := io.CopyN(bufW, bufR, benchmarkDataSize); err != nil {
b.Fatalf("unable to seed random data: %v", err)
}
source = sourceBuf.Bytes()
}
// Generate a random key for integrity check.
key, err := randomKey()
if err != nil {
b.Fatalf("error generating key: %v", err)
}
// Define our benchmark functions. Prior to running the readState
// function here, you must execute the writeState function at least
// once (done below).
var stateBuf bytes.Buffer
writeState := func() {
stateBuf.Reset()
w, err := NewWriter(&stateBuf, key, nil)
if err != nil {
b.Fatalf("error creating writer: %v", err)
}
for done := 0; done < len(source); {
chunk := size // limit size.
if done+chunk > len(source) {
chunk = len(source) - done
}
n, err := w.Write(source[done : done+chunk])
done += n
if n == 0 && err != nil {
b.Fatalf("error during write: %v", err)
}
}
if err := w.Close(); err != nil {
b.Fatalf("error closing writer: %v", err)
}
}
readState := func() {
tmpBuf := bytes.NewBuffer(stateBuf.Bytes())
r, _, err := NewReader(tmpBuf, key)
if err != nil {
b.Fatalf("error creating reader: %v", err)
}
for done := 0; done < len(source); {
chunk := size // limit size.
if done+chunk > len(source) {
chunk = len(source) - done
}
n, err := r.Read(source[done : done+chunk])
done += n
if n == 0 && err != nil {
b.Fatalf("error during read: %v", err)
}
}
}
// Generate the state once without timing to ensure that buffers have
// been appropriately allocated.
writeState()
if write {
b.StartTimer()
for i := 0; i < b.N; i++ {
writeState()
}
b.StopTimer()
} else {
b.StartTimer()
for i := 0; i < b.N; i++ {
readState()
}
b.StopTimer()
}
}
func BenchmarkWrite1BCompressible(b *testing.B) {
benchmark(b, 1, true, true)
}
func BenchmarkWrite1BNoncompressible(b *testing.B) {
benchmark(b, 1, true, false)
}
func BenchmarkWrite4KCompressible(b *testing.B) {
benchmark(b, 4096, true, true)
}
func BenchmarkWrite4KNoncompressible(b *testing.B) {
benchmark(b, 4096, true, false)
}
func BenchmarkWrite1MCompressible(b *testing.B) {
benchmark(b, 1024*1024, true, true)
}
func BenchmarkWrite1MNoncompressible(b *testing.B) {
benchmark(b, 1024*1024, true, false)
}
func BenchmarkRead1BCompressible(b *testing.B) {
benchmark(b, 1, false, true)
}
func BenchmarkRead1BNoncompressible(b *testing.B) {
benchmark(b, 1, false, false)
}
func BenchmarkRead4KCompressible(b *testing.B) {
benchmark(b, 4096, false, true)
}
func BenchmarkRead4KNoncompressible(b *testing.B) {
benchmark(b, 4096, false, false)
}
func BenchmarkRead1MCompressible(b *testing.B) {
benchmark(b, 1024*1024, false, true)
}
func BenchmarkRead1MNoncompressible(b *testing.B) {
benchmark(b, 1024*1024, false, false)
}
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