// handleAddrMsg is invoked when a peer receives an addr bitcoin message and
// is used to notify the server about advertised addresses.
func (p *peer) handleAddrMsg(msg *btcwire.MsgAddr) {
	// Ignore old style addresses which don't include a timestamp.
	if p.protocolVersion < btcwire.NetAddressTimeVersion {
		return
	}

	// A message that has no addresses is invalid.
	if len(msg.AddrList) == 0 {
		p.logError("PEER: Command [%s] from %s does not contain any addresses",
			msg.Command(), p.addr)
		p.Disconnect()
		return
	}

	for _, na := range msg.AddrList {
		// Don't add more address if we're disconnecting.
		if atomic.LoadInt32(&p.disconnect) != 0 {
			return
		}

		// Set the timestamp to 5 days ago if it's more than 24 hours
		// in the future so this address is one of the first to be
		// removed when space is needed.
		now := time.Now()
		if na.Timestamp.After(now.Add(time.Minute * 10)) {
			na.Timestamp = now.Add(-1 * time.Hour * 24 * 5)
		}

		// Add address to known addresses for this peer.
		p.knownAddresses[NetAddressKey(na)] = true
	}

	// Add addresses to server address manager.  The address manager handles
	// the details of things such as preventing duplicate addresses, max
	// addresses, and last seen updates.
	// XXX bitcoind gives a 2 hour time penalty here, do we want to do the
	// same?
	p.server.addrManager.AddAddresses(msg.AddrList, p.na)
}

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

	// A couple of NetAddresses to use for testing.
	na := &btcwire.NetAddress{
		Timestamp: time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
		Services:  btcwire.SFNodeNetwork,
		IP:        net.ParseIP("127.0.0.1"),
		Port:      8333,
	}
	na2 := &btcwire.NetAddress{
		Timestamp: time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
		Services:  btcwire.SFNodeNetwork,
		IP:        net.ParseIP("192.168.0.1"),
		Port:      8334,
	}

	// Address message with multiple addresses.
	baseAddr := btcwire.NewMsgAddr()
	baseAddr.AddAddresses(na, na2)
	baseAddrEncoded := []byte{
		0x02,                   // Varint for number of addresses
		0x29, 0xab, 0x5f, 0x49, // Timestamp
		0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // SFNodeNetwork
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x01, // IP 127.0.0.1
		0x20, 0x8d, // Port 8333 in big-endian
		0x29, 0xab, 0x5f, 0x49, // Timestamp
		0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // SFNodeNetwork
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0xff, 0xff, 0xc0, 0xa8, 0x00, 0x01, // IP 192.168.0.1
		0x20, 0x8e, // Port 8334 in big-endian

	}

	// Message that forces an error by having more than the max allowed
	// addresses.
	maxAddr := btcwire.NewMsgAddr()
	for i := 0; i < btcwire.MaxAddrPerMsg; i++ {
		maxAddr.AddAddress(na)
	}
	maxAddr.AddrList = append(maxAddr.AddrList, na)
	maxAddrEncoded := []byte{
		0xfd, 0x03, 0xe9, // Varint for number of addresses (1001)
	}

	tests := []struct {
		in       *btcwire.MsgAddr // 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 addresses count
		{baseAddr, baseAddrEncoded, pver, 0, io.ErrShortWrite, io.EOF},
		// Force error in address list.
		{baseAddr, baseAddrEncoded, pver, 1, io.ErrShortWrite, io.EOF},
		// Force error with greater than max inventory vectors.
		{maxAddr, maxAddrEncoded, pver, 3, btcwireErr, btcwireErr},
		// Force error with greater than max inventory vectors for
		// protocol versions before multiple addresses were allowed.
		{maxAddr, maxAddrEncoded, pverMA - 1, 3, 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.MsgAddr
		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
		}
//.........这里部分代码省略.........

// TestAddrWire tests the MsgAddr wire encode and decode for various numbers
// of addreses and protocol versions.
func TestAddrWire(t *testing.T) {
	// A couple of NetAddresses to use for testing.
	na := &btcwire.NetAddress{
		Timestamp: time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
		Services:  btcwire.SFNodeNetwork,
		IP:        net.ParseIP("127.0.0.1"),
		Port:      8333,
	}
	na2 := &btcwire.NetAddress{
		Timestamp: time.Unix(0x495fab29, 0), // 2009-01-03 12:15:05 -0600 CST
		Services:  btcwire.SFNodeNetwork,
		IP:        net.ParseIP("192.168.0.1"),
		Port:      8334,
	}

	// Empty address message.
	noAddr := btcwire.NewMsgAddr()
	noAddrEncoded := []byte{
		0x00, // Varint for number of addresses
	}

	// Address message with multiple addresses.
	multiAddr := btcwire.NewMsgAddr()
	multiAddr.AddAddresses(na, na2)
	multiAddrEncoded := []byte{
		0x02,                   // Varint for number of addresses
		0x29, 0xab, 0x5f, 0x49, // Timestamp
		0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // SFNodeNetwork
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0xff, 0xff, 0x7f, 0x00, 0x00, 0x01, // IP 127.0.0.1
		0x20, 0x8d, // Port 8333 in big-endian
		0x29, 0xab, 0x5f, 0x49, // Timestamp
		0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // SFNodeNetwork
		0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
		0x00, 0x00, 0xff, 0xff, 0xc0, 0xa8, 0x00, 0x01, // IP 192.168.0.1
		0x20, 0x8e, // Port 8334 in big-endian

	}

	tests := []struct {
		in   *btcwire.MsgAddr // Message to encode
		out  *btcwire.MsgAddr // Expected decoded message
		buf  []byte           // Wire encoding
		pver uint32           // Protocol version for wire encoding
	}{
		// Latest protocol version with no addresses.
		{
			noAddr,
			noAddr,
			noAddrEncoded,
			btcwire.ProtocolVersion,
		},

		// Latest protocol version with multiple addresses.
		{
			multiAddr,
			multiAddr,
			multiAddrEncoded,
			btcwire.ProtocolVersion,
		},

		// Protocol version MultipleAddressVersion-1 with no addresses.
		{
			noAddr,
			noAddr,
			noAddrEncoded,
			btcwire.MultipleAddressVersion - 1,
		},
	}

	t.Logf("Running %d tests", len(tests))
	for i, test := range tests {
		// Encode the message to wire format.
		var buf bytes.Buffer
		err := test.in.BtcEncode(&buf, test.pver)
		if err != nil {
			t.Errorf("BtcEncode #%d error %v", i, err)
			continue
		}
		if !bytes.Equal(buf.Bytes(), test.buf) {
			t.Errorf("BtcEncode #%d\n got: %s want: %s", i,
				spew.Sdump(buf.Bytes()), spew.Sdump(test.buf))
			continue
		}

		// Decode the message from wire format.
		var msg btcwire.MsgAddr
		rbuf := bytes.NewBuffer(test.buf)
		err = msg.BtcDecode(rbuf, test.pver)
		if err != nil {
			t.Errorf("BtcDecode #%d error %v", i, err)
			continue
		}
		if !reflect.DeepEqual(&msg, test.out) {
			t.Errorf("BtcDecode #%d\n got: %s want: %s", i,
				spew.Sdump(msg), spew.Sdump(test.out))
			continue
		}
//.........这里部分代码省略.........