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package p2p
import (
"bytes"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"runtime"
"strings"
"testing"
"time"
)
func TestNewMsg(t *testing.T) {
msg := NewMsg(3, 1, "000")
if msg.Code != 3 {
t.Errorf("incorrect code %d, want %d", msg.Code)
}
expect := unhex("c50183303030")
if msg.Size != uint32(len(expect)) {
t.Errorf("incorrect size %d, want %d", msg.Size, len(expect))
}
pl, _ := ioutil.ReadAll(msg.Payload)
if !bytes.Equal(pl, expect) {
t.Errorf("incorrect payload content, got %x, want %x", pl, expect)
}
}
func ExampleMsgPipe() {
rw1, rw2 := MsgPipe()
go func() {
EncodeMsg(rw1, 8, []byte{0, 0})
EncodeMsg(rw1, 5, []byte{1, 1})
rw1.Close()
}()
for {
msg, err := rw2.ReadMsg()
if err != nil {
break
}
var data [1][]byte
msg.Decode(&data)
fmt.Printf("msg: %d, %x\n", msg.Code, data[0])
}
// Output:
// msg: 8, 0000
// msg: 5, 0101
}
func TestMsgPipeUnblockWrite(t *testing.T) {
loop:
for i := 0; i < 100; i++ {
rw1, rw2 := MsgPipe()
done := make(chan struct{})
go func() {
if err := EncodeMsg(rw1, 1); err == nil {
t.Error("EncodeMsg returned nil error")
} else if err != ErrPipeClosed {
t.Error("EncodeMsg returned wrong error: got %v, want %v", err, ErrPipeClosed)
}
close(done)
}()
// this call should ensure that EncodeMsg is waiting to
// deliver sometimes. if this isn't done, Close is likely to
// be executed before EncodeMsg starts and then we won't test
// all the cases.
runtime.Gosched()
rw2.Close()
select {
case <-done:
case <-time.After(200 * time.Millisecond):
t.Errorf("write didn't unblock")
break loop
}
}
}
// This test should panic if concurrent close isn't implemented correctly.
func TestMsgPipeConcurrentClose(t *testing.T) {
rw1, _ := MsgPipe()
for i := 0; i < 10; i++ {
go rw1.Close()
}
}
func TestEOFSignal(t *testing.T) {
rb := make([]byte, 10)
// empty reader
eof := make(chan struct{}, 1)
sig := &eofSignal{new(bytes.Buffer), 0, eof}
if n, err := sig.Read(rb); n != 0 || err != io.EOF {
t.Errorf("Read returned unexpected values: (%v, %v)", n, err)
}
select {
case <-eof:
default:
t.Error("EOF chan not signaled")
}
// count before error
eof = make(chan struct{}, 1)
sig = &eofSignal{bytes.NewBufferString("aaaaaaaa"), 4, eof}
if n, err := sig.Read(rb); n != 4 || err != nil {
t.Errorf("Read returned unexpected values: (%v, %v)", n, err)
}
select {
case <-eof:
default:
t.Error("EOF chan not signaled")
}
// error before count
eof = make(chan struct{}, 1)
sig = &eofSignal{bytes.NewBufferString("aaaa"), 999, eof}
if n, err := sig.Read(rb); n != 4 || err != nil {
t.Errorf("Read returned unexpected values: (%v, %v)", n, err)
}
if n, err := sig.Read(rb); n != 0 || err != io.EOF {
t.Errorf("Read returned unexpected values: (%v, %v)", n, err)
}
select {
case <-eof:
default:
t.Error("EOF chan not signaled")
}
// no signal if neither occurs
eof = make(chan struct{}, 1)
sig = &eofSignal{bytes.NewBufferString("aaaaaaaaaaaaaaaaaaaaa"), 999, eof}
if n, err := sig.Read(rb); n != 10 || err != nil {
t.Errorf("Read returned unexpected values: (%v, %v)", n, err)
}
select {
case <-eof:
t.Error("unexpected EOF signal")
default:
}
}
func unhex(str string) []byte {
b, err := hex.DecodeString(strings.Replace(str, "\n", "", -1))
if err != nil {
panic(fmt.Sprintf("invalid hex string: %q", str))
}
return b
}
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