path: root/p2p/message_test.go

package p2p

import (
    "bytes"
    "fmt"
    "io/ioutil"
    "runtime"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/ethutil"
)

func TestNewMsg(t *testing.T) {
    msg := NewMsg(3, 1, "000")
    if msg.Code != 3 {
        t.Errorf("incorrect code %d, want %d", msg.Code)
    }
    if msg.Size != 5 {
        t.Errorf("incorrect size %d, want %d", msg.Size, 5)
    }
    pl, _ := ioutil.ReadAll(msg.Payload)
    expect := []byte{0x01, 0x83, 0x30, 0x30, 0x30}
    if !bytes.Equal(pl, expect) {
        t.Errorf("incorrect payload content, got %x, want %x", pl, expect)
    }
}

func TestEncodeDecodeMsg(t *testing.T) {
    msg := NewMsg(3, 1, "000")
    buf := new(bytes.Buffer)
    if err := writeMsg(buf, msg); err != nil {
        t.Fatalf("encodeMsg error: %v", err)
    }
    // t.Logf("encoded: %x", buf.Bytes())

    decmsg, err := readMsg(buf)
    if err != nil {
        t.Fatalf("readMsg error: %v", err)
    }
    if decmsg.Code != 3 {
        t.Errorf("incorrect code %d, want %d", decmsg.Code, 3)
    }
    if decmsg.Size != 5 {
        t.Errorf("incorrect size %d, want %d", decmsg.Size, 5)
    }

    var data struct {
        I uint
        S string
    }
    if err := decmsg.Decode(&data); err != nil {
        t.Fatalf("Decode error: %v", err)
    }
    if data.I != 1 {
        t.Errorf("incorrect data.I: got %v, expected %d", data.I, 1)
    }
    if data.S != "000" {
        t.Errorf("incorrect data.S: got %q, expected %q", data.S, "000")
    }
}

func TestDecodeRealMsg(t *testing.T) {
    data := ethutil.Hex2Bytes("2240089100000080f87e8002b5457468657265756d282b2b292f5065657220536572766572204f6e652f76302e372e382f52656c656173652f4c696e75782f672b2bc082765fb84086dd80b7aefd6a6d2e3b93f4f300a86bfb6ef7bdc97cb03f793db6bb")
    msg, err := readMsg(bytes.NewReader(data))
    if err != nil {
        t.Fatalf("unexpected error: %v", err)
    }

    if msg.Code != 0 {
        t.Errorf("incorrect code %d, want %d", msg.Code, 0)
    }
}

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()
    }
}