Golang btcwire.NewMsgPong函数代码示例

// TestPongCrossProtocol tests the MsgPong API when encoding with the latest
// protocol version and decoded with BIP0031Version.
func TestPongCrossProtocol(t *testing.T) {
	nonce, err := btcwire.RandomUint64()
	if err != nil {
		t.Errorf("Error generating nonce: %v", err)
	}
	msg := btcwire.NewMsgPong(nonce)
	if msg.Nonce != nonce {
		t.Errorf("Should get same nonce back out.")
	}

	// Encode with latest protocol version.
	var buf bytes.Buffer
	err = msg.BtcEncode(&buf, btcwire.ProtocolVersion)
	if err != nil {
		t.Errorf("encode of MsgPong failed %v err <%v>", msg, err)
	}

	// Decode with old protocol version.
	readmsg := btcwire.NewMsgPong(0)
	err = readmsg.BtcDecode(&buf, btcwire.BIP0031Version)
	if err == nil {
		t.Errorf("encode of MsgPong succeeded when it shouldn't have %v",
			msg)
	}

	// Since one of the protocol versions doesn't support the pong message,
	// make  sure the nonce didn't get encoded and decoded back out.
	if msg.Nonce == readmsg.Nonce {
		t.Error("Should not get same nonce for cross protocol")
	}
}

// TestPongLatest tests the MsgPong API against the latest protocol version.
func TestPongLatest(t *testing.T) {
	pver := btcwire.ProtocolVersion

	nonce, err := btcwire.RandomUint64()
	if err != nil {
		t.Errorf("RandomUint64: error generating nonce: %v", err)
	}
	msg := btcwire.NewMsgPong(nonce)
	if msg.Nonce != nonce {
		t.Errorf("NewMsgPong: wrong nonce - got %v, want %v",
			msg.Nonce, nonce)
	}

	// Ensure the command is expected value.
	wantCmd := "pong"
	if cmd := msg.Command(); cmd != wantCmd {
		t.Errorf("NewMsgPong: wrong command - got %v want %v",
			cmd, wantCmd)
	}

	// Ensure max payload is expected value for latest protocol version.
	wantPayload := uint32(8)
	maxPayload := msg.MaxPayloadLength(pver)
	if maxPayload != wantPayload {
		t.Errorf("MaxPayloadLength: wrong max payload length for "+
			"protocol version %d - got %v, want %v", pver,
			maxPayload, wantPayload)
	}

	// Test encode with latest protocol version.
	var buf bytes.Buffer
	err = msg.BtcEncode(&buf, pver)
	if err != nil {
		t.Errorf("encode of MsgPong failed %v err <%v>", msg, err)
	}

	// Test decode with latest protocol version.
	readmsg := btcwire.NewMsgPong(0)
	err = readmsg.BtcDecode(&buf, pver)
	if err != nil {
		t.Errorf("decode of MsgPong failed [%v] err <%v>", buf, err)
	}

	// Ensure nonce is the same.
	if msg.Nonce != readmsg.Nonce {
		t.Errorf("Should get same nonce for protocol version %d", pver)
	}

	return
}

// handlePingMsg is invoked when a peer receives a ping bitcoin message.  For
// recent clients (protocol version > BIP0031Version), it replies with a pong
// message.  For older clients, it does nothing and anything other than failure
// is considered a successful ping.
func (p *peer) handlePingMsg(msg *btcwire.MsgPing) {
	// Only Reply with pong is message comes from a new enough client.
	if p.protocolVersion > btcwire.BIP0031Version {
		// Include nonce from ping so pong can be identified.
		p.QueueMessage(btcwire.NewMsgPong(msg.Nonce), nil)
	}
}

// TestPongBIP0031 tests the MsgPong API against the protocol version
// BIP0031Version.
func TestPongBIP0031(t *testing.T) {
	// Use the protocol version just prior to BIP0031Version changes.
	pver := btcwire.BIP0031Version

	nonce, err := btcwire.RandomUint64()
	if err != nil {
		t.Errorf("Error generating nonce: %v", err)
	}
	msg := btcwire.NewMsgPong(nonce)
	if msg.Nonce != nonce {
		t.Errorf("Should get same nonce back out.")
	}

	// Ensure max payload is expected value for old protocol version.
	size := msg.MaxPayloadLength(pver)
	if size != 0 {
		t.Errorf("Max length should be 0 for pong protocol version %d.",
			pver)
	}

	// Test encode with old protocol version.
	var buf bytes.Buffer
	err = msg.BtcEncode(&buf, pver)
	if err == nil {
		t.Errorf("encode of MsgPong succeeded when it shouldn't have %v",
			msg)
	}

	// Test decode with old protocol version.
	readmsg := btcwire.NewMsgPong(0)
	err = readmsg.BtcDecode(&buf, pver)
	if err == nil {
		t.Errorf("decode of MsgPong succeeded when it shouldn't have",
			spew.Sdump(buf))
	}

	// Since this protocol version doesn't support pong, make sure the
	// nonce didn't get encoded and decoded back out.
	if msg.Nonce == readmsg.Nonce {
		t.Errorf("Should not get same nonce for protocol version %d", pver)
	}

	return
}

func connHandler(id int, outAddrs chan<- []*btc.NetAddress, outNode chan<- Node, inAddr <-chan *btc.NetAddress) {
	// A worker that deals with the connection to a single bitcoin node.
	// It writes the list of nodes reported by node into out.
	// It also writes a valid node into outNode.
	// It reads from inAddr everytime it closes a connection

	for {
		addr := <-inAddr
		strA := addressFmt(*addr)

		threadLog := func(reported LogLevel, msg string) {
			if reported <= Level {
				logger.Printf("[%d] %s: %s\n", id, strA, msg)
			}
		}
		connProtoVer := btc.ProtocolVersion
		write := composeWrite(threadLog, connProtoVer)

		conn, err := net.DialTimeout("tcp", strA, time.Millisecond*500)
		if err != nil {
			threadLog(Log, err.Error())
			continue
		}
		threadLog(Info, "Connected")

		ver_m, _ := btc.NewMsgVersionFromConn(conn, genNonce(), 0)
		ver_m.AddUserAgent("btcmonitor", "0.0.1")
		write(conn, ver_m)

		// We are looking for successful addr messages
		wins := 0
		// After 10 seconds we just close the conn and handle errors
		time.AfterFunc(time.Second*10, func() { conn.Close() })
	MessageLoop:
		for {
			var resp btc.Message
			resp, _, err := btc.ReadMessage(conn, connProtoVer, btcnet)
			if err != nil {
				threadLog(Log, err.Error())
				break MessageLoop
			}
			threadLog(Info, resp.Command())
			switch resp := resp.(type) {
			case *btc.MsgVersion:
				nodePVer := uint32(resp.ProtocolVersion)
				if nodePVer < connProtoVer {
					connProtoVer = nodePVer
					write = composeWrite(threadLog, connProtoVer)
				}
				node := convNode(*addr, *resp)
				outNode <- node
				verack := btc.NewMsgVerAck()
				write(conn, verack)
				getAddr := btc.NewMsgGetAddr()
				write(conn, getAddr)
			case *btc.MsgAddr:
				wins += 1
				addrs := resp.AddrList
				outAddrs <- addrs
				if wins == 3 {
					break MessageLoop
				}
			case *btc.MsgPing:
				nonce := resp.Nonce
				pong := btc.NewMsgPong(nonce)
				write(conn, pong)
			}
		}
	}
}

// TestMessage tests the Read/WriteMessage API.
func TestMessage(t *testing.T) {
	pver := btcwire.ProtocolVersion

	// Create the various types of messages to test.

	// MsgVersion.
	addrYou := &net.TCPAddr{IP: net.ParseIP("192.168.0.1"), Port: 8333}
	you, err := btcwire.NewNetAddress(addrYou, btcwire.SFNodeNetwork)
	if err != nil {
		t.Errorf("NewNetAddress: %v", err)
	}
	you.Timestamp = time.Time{} // Version message has zero value timestamp.
	addrMe := &net.TCPAddr{IP: net.ParseIP("127.0.0.1"), Port: 8333}
	me, err := btcwire.NewNetAddress(addrMe, btcwire.SFNodeNetwork)
	if err != nil {
		t.Errorf("NewNetAddress: %v", err)
	}
	me.Timestamp = time.Time{} // Version message has zero value timestamp.
	msgVersion := btcwire.NewMsgVersion(me, you, 123123, "/test:0.0.1/", 0)

	msgVerack := btcwire.NewMsgVerAck()
	msgGetAddr := btcwire.NewMsgGetAddr()
	msgAddr := btcwire.NewMsgAddr()
	msgGetBlocks := btcwire.NewMsgGetBlocks(&btcwire.ShaHash{})
	msgBlock := &blockOne
	msgInv := btcwire.NewMsgInv()
	msgGetData := btcwire.NewMsgGetData()
	msgNotFound := btcwire.NewMsgNotFound()
	msgTx := btcwire.NewMsgTx()
	msgPing := btcwire.NewMsgPing(123123)
	msgPong := btcwire.NewMsgPong(123123)
	msgGetHeaders := btcwire.NewMsgGetHeaders()
	msgHeaders := btcwire.NewMsgHeaders()
	msgAlert := btcwire.NewMsgAlert("payload", "signature")
	msgMemPool := btcwire.NewMsgMemPool()

	tests := []struct {
		in     btcwire.Message    // Value to encode
		out    btcwire.Message    // Expected decoded value
		pver   uint32             // Protocol version for wire encoding
		btcnet btcwire.BitcoinNet // Network to use for wire encoding
	}{
		{msgVersion, msgVersion, pver, btcwire.MainNet},
		{msgVerack, msgVerack, pver, btcwire.MainNet},
		{msgGetAddr, msgGetAddr, pver, btcwire.MainNet},
		{msgAddr, msgAddr, pver, btcwire.MainNet},
		{msgGetBlocks, msgGetBlocks, pver, btcwire.MainNet},
		{msgBlock, msgBlock, pver, btcwire.MainNet},
		{msgInv, msgInv, pver, btcwire.MainNet},
		{msgGetData, msgGetData, pver, btcwire.MainNet},
		{msgNotFound, msgNotFound, pver, btcwire.MainNet},
		{msgTx, msgTx, pver, btcwire.MainNet},
		{msgPing, msgPing, pver, btcwire.MainNet},
		{msgPong, msgPong, pver, btcwire.MainNet},
		{msgGetHeaders, msgGetHeaders, pver, btcwire.MainNet},
		{msgHeaders, msgHeaders, pver, btcwire.MainNet},
		{msgAlert, msgAlert, pver, btcwire.MainNet},
		{msgMemPool, msgMemPool, pver, btcwire.MainNet},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode to wire format.
		var buf bytes.Buffer
		err := btcwire.WriteMessage(&buf, test.in, test.pver, test.btcnet)
		if err != nil {
			t.Errorf("WriteMessage #%d error %v", i, err)
			continue
		}

		// Decode from wire format.
		rbuf := bytes.NewBuffer(buf.Bytes())
		msg, _, err := btcwire.ReadMessage(rbuf, test.pver, test.btcnet)
		if err != nil {
			t.Errorf("ReadMessage #%d error %v, msg %v", i, err,
				spew.Sdump(msg))
			continue
		}
		if !reflect.DeepEqual(msg, test.out) {
			t.Errorf("ReadMessage #%d\n got: %v want: %v", i,
				spew.Sdump(msg), spew.Sdump(test.out))
			continue
		}
	}
}

// TestPongWireErrors performs negative tests against wire encode and decode
// of MsgPong to confirm error paths work correctly.
func TestPongWireErrors(t *testing.T) {
	pver := btcwire.ProtocolVersion
	pverNoPong := btcwire.BIP0031Version
	btcwireErr := &btcwire.MessageError{}

	basePong := btcwire.NewMsgPong(123123) // 0x1e0f3
	basePongEncoded := []byte{
		0xf3, 0xe0, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
	}

	tests := []struct {
		in       *btcwire.MsgPong // Value to encode
		buf      []byte           // Wire encoding
		pver     uint32           // Protocol version for wire encoding
		max      int              // Max size of fixed buffer to induce errors
		writeErr error            // Expected write error
		readErr  error            // Expected read error
	}{
		// Latest protocol version with intentional read/write errors.
		// Force error in nonce.
		{basePong, basePongEncoded, pver, 0, io.ErrShortWrite, io.EOF},
		// Force error due to unsupported protocol version.
		{basePong, basePongEncoded, pverNoPong, 4, btcwireErr, btcwireErr},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode to wire format.
		w := newFixedWriter(test.max)
		err := test.in.BtcEncode(w, test.pver)
		if reflect.TypeOf(err) != reflect.TypeOf(test.writeErr) {
			t.Errorf("BtcEncode #%d wrong error got: %v, want: %v",
				i, err, test.writeErr)
			continue
		}

		// For errors which are not of type btcwire.MessageError, check
		// them for equality.
		if _, ok := err.(*btcwire.MessageError); !ok {
			if err != test.writeErr {
				t.Errorf("BtcEncode #%d wrong error got: %v, "+
					"want: %v", i, err, test.writeErr)
				continue
			}
		}

		// Decode from wire format.
		var msg btcwire.MsgPong
		r := newFixedReader(test.max, test.buf)
		err = msg.BtcDecode(r, test.pver)
		if reflect.TypeOf(err) != reflect.TypeOf(test.readErr) {
			t.Errorf("BtcDecode #%d wrong error got: %v, want: %v",
				i, err, test.readErr)
			continue
		}

		// For errors which are not of type btcwire.MessageError, check
		// them for equality.
		if _, ok := err.(*btcwire.MessageError); !ok {
			if err != test.readErr {
				t.Errorf("BtcDecode #%d wrong error got: %v, "+
					"want: %v", i, err, test.readErr)
				continue
			}
		}

	}
}

func nodeHandler(cfg TowerCfg, txStream chan<- *TxMeta, blockStream chan<- *btcwire.MsgBlock) {

	conn := setupConn(cfg.Addr, cfg.Logger)

	connparams := connParams{
		conn:    conn,
		pver:    btcwire.ProtocolVersion,
		btcnet:  cfg.Net,
		logger:  cfg.Logger,
		insetup: true,
	}

	read, write := composeConnOuts(connparams)

	// Initial handshake
	ver_m, _ := btcwire.NewMsgVersionFromConn(conn, genNonce(), int32(cfg.StartHeight))
	ver_m.AddUserAgent("Watchtower", "0.0.0")

	write(ver_m)

	// Wait for responses
	acked, responded := false, false
	for {
		var msg btcwire.Message
		msg = read()
		cfg.Logger.Println(msg.Command())
		switch msg := msg.(type) {
		case *btcwire.MsgVersion:
			responded = true
			ack := btcwire.NewMsgVerAck()
			nodeVer := uint32(msg.ProtocolVersion)
			if nodeVer < connparams.pver {
				connparams.pver = nodeVer
				read, write = composeConnOuts(connparams)
			}
			write(ack)
		case *btcwire.MsgVerAck:
			acked = true
		}
		if responded && acked {
			break
		}
	}

	// We are through the initial handshake, assume functional channel from here
	// on out. If there any errors with the pipe logger.Fatal gets called.
	connparams.insetup = false
	read, write = composeConnOuts(connparams)
	cfg.Logger.Println("Conn Negotiated")

	for {
		// If there are messages to send to peers send them. Otherwise, listen!
		select {
		case msg := <-cfg.MsgChan:
			write(msg)
		default:
			// listen for txs + blocks then push them into the appropriatestreams
			msg := read()
			switch msg := msg.(type) {
			case *btcwire.MsgInv:
				want := btcwire.NewMsgGetData()
				invVec := msg.InvList
				for i := range invVec {
					chunk := invVec[i]
					want.AddInvVect(chunk)
				}
				write(want)
			case *btcwire.MsgTx:
				var empt []byte // evaluates to nil
				meta := TxMeta{MsgTx: msg, BlockSha: empt, Time: time.Now()}
				txStream <- &meta
			case *btcwire.MsgBlock:
				blockStream <- msg
			case *btcwire.MsgPing:
				pong := btcwire.NewMsgPong(msg.Nonce)
				// More fun than anything...
				write(pong)
			}
		}
	}
}