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package pgproto3
import (
"bytes"
"math/rand"
"testing"
)
func TestChunkReaderNextDoesNotReadIfAlreadyBuffered(t *testing.T) {
server := &bytes.Buffer{}
r := newChunkReader(server, 4)
src := []byte{1, 2, 3, 4}
server.Write(src)
n1, err := r.Next(2)
if err != nil {
t.Fatal(err)
}
if bytes.Compare(n1, src[0:2]) != 0 {
t.Fatalf("Expected read bytes to be %v, but they were %v", src[0:2], n1)
}
n2, err := r.Next(2)
if err != nil {
t.Fatal(err)
}
if bytes.Compare(n2, src[2:4]) != 0 {
t.Fatalf("Expected read bytes to be %v, but they were %v", src[2:4], n2)
}
if bytes.Compare((*r.buf)[:len(src)], src) != 0 {
t.Fatalf("Expected r.buf to be %v, but it was %v", src, r.buf)
}
_, err = r.Next(0) // Trigger the buffer reset.
if err != nil {
t.Fatal(err)
}
if r.rp != 0 {
t.Fatalf("Expected r.rp to be %v, but it was %v", 0, r.rp)
}
if r.wp != 0 {
t.Fatalf("Expected r.wp to be %v, but it was %v", 0, r.wp)
}
}
type randomReader struct {
rnd *rand.Rand
}
// Read reads a random number of random bytes.
func (r *randomReader) Read(p []byte) (n int, err error) {
n = r.rnd.Intn(len(p) + 1)
return r.rnd.Read(p[:n])
}
func TestChunkReaderNextFuzz(t *testing.T) {
rr := &randomReader{rnd: rand.New(rand.NewSource(1))}
r := newChunkReader(rr, 8192)
randomSizes := rand.New(rand.NewSource(0))
for i := 0; i < 100000; i++ {
size := randomSizes.Intn(16384) + 1
buf, err := r.Next(size)
if err != nil {
t.Fatal(err)
}
if len(buf) != size {
t.Fatalf("Expected to get %v bytes but got %v bytes", size, len(buf))
}
}
}
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