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package aws
import (
"bytes"
"math/rand"
"testing"
)
func TestWriteAtBuffer(t *testing.T) {
b := &WriteAtBuffer{}
n, err := b.WriteAt([]byte{1}, 0)
if err != nil {
t.Errorf("expected no error, but received %v", err)
}
if e, a := 1, n; e != a {
t.Errorf("expected %d, but received %d", e, a)
}
n, err = b.WriteAt([]byte{1, 1, 1}, 5)
if err != nil {
t.Errorf("expected no error, but received %v", err)
}
if e, a := 3, n; e != a {
t.Errorf("expected %d, but received %d", e, a)
}
n, err = b.WriteAt([]byte{2}, 1)
if err != nil {
t.Errorf("expected no error, but received %v", err)
}
if e, a := 1, n; e != a {
t.Errorf("expected %d, but received %d", e, a)
}
n, err = b.WriteAt([]byte{3}, 2)
if err != nil {
t.Errorf("expected no error, but received %v", err)
}
if e, a := 1, n; e != a {
t.Errorf("expected %d, but received %d", e, a)
}
if !bytes.Equal([]byte{1, 2, 3, 0, 0, 1, 1, 1}, b.Bytes()) {
t.Errorf("expected %v, but received %v", []byte{1, 2, 3, 0, 0, 1, 1, 1}, b.Bytes())
}
}
func BenchmarkWriteAtBuffer(b *testing.B) {
buf := &WriteAtBuffer{}
r := rand.New(rand.NewSource(1))
b.ResetTimer()
for i := 0; i < b.N; i++ {
to := r.Intn(10) * 4096
bs := make([]byte, to)
buf.WriteAt(bs, r.Int63n(10)*4096)
}
}
func BenchmarkWriteAtBufferOrderedWrites(b *testing.B) {
// test the performance of a WriteAtBuffer when written in an
// ordered fashion. This is similar to the behavior of the
// s3.Downloader, since downloads the first chunk of the file, then
// the second, and so on.
//
// This test simulates a 150MB file being written in 30 ordered 5MB chunks.
chunk := int64(5e6)
max := chunk * 30
// we'll write the same 5MB chunk every time
tmp := make([]byte, chunk)
for i := 0; i < b.N; i++ {
buf := &WriteAtBuffer{}
for i := int64(0); i < max; i += chunk {
buf.WriteAt(tmp, i)
}
}
}
func BenchmarkWriteAtBufferParallel(b *testing.B) {
buf := &WriteAtBuffer{}
r := rand.New(rand.NewSource(1))
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
to := r.Intn(10) * 4096
bs := make([]byte, to)
buf.WriteAt(bs, r.Int63n(10)*4096)
}
})
}
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