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package regretable_test
import (
"bytes"
. "github.com/elazarl/goproxy/regretable"
"io"
"io/ioutil"
"strings"
"testing"
)
func TestRegretableReader(t *testing.T) {
buf := new(bytes.Buffer)
mb := NewRegretableReader(buf)
word := "12345678"
buf.WriteString(word)
fivebytes := make([]byte, 5)
mb.Read(fivebytes)
mb.Regret()
s, _ := ioutil.ReadAll(mb)
if string(s) != word {
t.Errorf("Uncommitted read is gone, [%d,%d] actual '%v' expected '%v'\n", len(s), len(word), string(s), word)
}
}
func TestRegretableEmptyRead(t *testing.T) {
buf := new(bytes.Buffer)
mb := NewRegretableReader(buf)
word := "12345678"
buf.WriteString(word)
zero := make([]byte, 0)
mb.Read(zero)
mb.Regret()
s, err := ioutil.ReadAll(mb)
if string(s) != word {
t.Error("Uncommitted read is gone, actual:", string(s), "expected:", word, "err:", err)
}
}
func TestRegretableAlsoEmptyRead(t *testing.T) {
buf := new(bytes.Buffer)
mb := NewRegretableReader(buf)
word := "12345678"
buf.WriteString(word)
one := make([]byte, 1)
zero := make([]byte, 0)
five := make([]byte, 5)
mb.Read(one)
mb.Read(zero)
mb.Read(five)
mb.Regret()
s, _ := ioutil.ReadAll(mb)
if string(s) != word {
t.Error("Uncommitted read is gone", string(s), "expected", word)
}
}
func TestRegretableRegretBeforeRead(t *testing.T) {
buf := new(bytes.Buffer)
mb := NewRegretableReader(buf)
word := "12345678"
buf.WriteString(word)
five := make([]byte, 5)
mb.Regret()
mb.Read(five)
s, err := ioutil.ReadAll(mb)
if string(s) != "678" {
t.Error("Uncommitted read is gone", string(s), len(string(s)), "expected", "678", len("678"), "err:", err)
}
}
func TestRegretableFullRead(t *testing.T) {
buf := new(bytes.Buffer)
mb := NewRegretableReader(buf)
word := "12345678"
buf.WriteString(word)
twenty := make([]byte, 20)
mb.Read(twenty)
mb.Regret()
s, _ := ioutil.ReadAll(mb)
if string(s) != word {
t.Error("Uncommitted read is gone", string(s), len(string(s)), "expected", word, len(word))
}
}
func assertEqual(t *testing.T, expected, actual string) {
if expected != actual {
t.Fatal("Expected", expected, "actual", actual)
}
}
func assertReadAll(t *testing.T, r io.Reader) string {
s, err := ioutil.ReadAll(r)
if err != nil {
t.Fatal("error when reading", err)
}
return string(s)
}
func TestRegretableRegretTwice(t *testing.T) {
buf := new(bytes.Buffer)
mb := NewRegretableReader(buf)
word := "12345678"
buf.WriteString(word)
assertEqual(t, word, assertReadAll(t, mb))
mb.Regret()
assertEqual(t, word, assertReadAll(t, mb))
mb.Regret()
assertEqual(t, word, assertReadAll(t, mb))
}
type CloseCounter struct {
r io.Reader
closed int
}
func (cc *CloseCounter) Read(b []byte) (int, error) {
return cc.r.Read(b)
}
func (cc *CloseCounter) Close() error {
cc.closed++
return nil
}
func assert(t *testing.T, b bool, msg string) {
if !b {
t.Errorf("Assertion Error: %s", msg)
}
}
func TestRegretableCloserSizeRegrets(t *testing.T) {
defer func() {
if r := recover(); r == nil || !strings.Contains(r.(string), "regret") {
t.Error("Did not panic when regretting overread buffer:", r)
}
}()
buf := new(bytes.Buffer)
buf.WriteString("123456")
mb := NewRegretableReaderCloserSize(ioutil.NopCloser(buf), 3)
mb.Read(make([]byte, 4))
mb.Regret()
}
func TestRegretableCloserRegretsClose(t *testing.T) {
buf := new(bytes.Buffer)
cc := &CloseCounter{buf, 0}
mb := NewRegretableReaderCloser(cc)
word := "12345678"
buf.WriteString(word)
mb.Read([]byte{0})
mb.Close()
if cc.closed != 1 {
t.Error("RegretableReaderCloser ignores Close")
}
mb.Regret()
mb.Close()
if cc.closed != 2 {
t.Error("RegretableReaderCloser does ignore Close after regret")
}
// TODO(elazar): return an error if client issues Close more than once after regret
}
|
