restic/internal/hashing/reader_test.go

114 lines
2.5 KiB
Go

package hashing
import (
"bytes"
"crypto/rand"
"crypto/sha256"
"io"
"io/ioutil"
"testing"
rtest "github.com/restic/restic/internal/test"
)
// only expose Read method
type onlyReader struct {
io.Reader
}
type traceWriterTo struct {
io.Reader
writerTo io.WriterTo
Traced bool
}
func (r *traceWriterTo) WriteTo(w io.Writer) (n int64, err error) {
r.Traced = true
return r.writerTo.WriteTo(w)
}
func TestReader(t *testing.T) {
tests := []int{5, 23, 2<<18 + 23, 1 << 20}
for _, size := range tests {
data := make([]byte, size)
_, err := io.ReadFull(rand.Reader, data)
if err != nil {
t.Fatalf("ReadFull: %v", err)
}
expectedHash := sha256.Sum256(data)
for _, test := range []struct {
innerWriteTo, outerWriteTo bool
}{{false, false}, {false, true}, {true, false}, {true, true}} {
// test both code paths in WriteTo
src := bytes.NewReader(data)
rawSrc := &traceWriterTo{Reader: src, writerTo: src}
innerSrc := io.Reader(rawSrc)
if !test.innerWriteTo {
innerSrc = &onlyReader{Reader: rawSrc}
}
rd := NewReader(innerSrc, sha256.New())
// test both Read and WriteTo
outerSrc := io.Reader(rd)
if !test.outerWriteTo {
outerSrc = &onlyReader{Reader: outerSrc}
}
n, err := io.Copy(ioutil.Discard, outerSrc)
if err != nil {
t.Fatal(err)
}
if n != int64(size) {
t.Errorf("Reader: invalid number of bytes written: got %d, expected %d",
n, size)
}
resultingHash := rd.Sum(nil)
if !bytes.Equal(expectedHash[:], resultingHash) {
t.Errorf("Reader: hashes do not match: expected %02x, got %02x",
expectedHash, resultingHash)
}
rtest.Assert(t, rawSrc.Traced == (test.innerWriteTo && test.outerWriteTo),
"unexpected/missing writeTo call innerWriteTo %v outerWriteTo %v",
test.innerWriteTo, test.outerWriteTo)
}
}
}
func BenchmarkReader(b *testing.B) {
buf := make([]byte, 1<<22)
_, err := io.ReadFull(rand.Reader, buf)
if err != nil {
b.Fatal(err)
}
expectedHash := sha256.Sum256(buf)
b.SetBytes(int64(len(buf)))
b.ResetTimer()
for i := 0; i < b.N; i++ {
rd := NewReader(bytes.NewReader(buf), sha256.New())
n, err := io.Copy(ioutil.Discard, rd)
if err != nil {
b.Fatal(err)
}
if n != int64(len(buf)) {
b.Errorf("Reader: invalid number of bytes written: got %d, expected %d",
n, len(buf))
}
resultingHash := rd.Sum(nil)
if !bytes.Equal(expectedHash[:], resultingHash) {
b.Errorf("Reader: hashes do not match: expected %02x, got %02x",
expectedHash, resultingHash)
}
}
}