/
tcp_writer.go
259 lines (226 loc) · 7.07 KB
/
tcp_writer.go
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package tunnel
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"net"
"time"
"mongoshake/common"
"github.com/gugemichael/nimo4go"
LOG "github.com/vinllen/log4go"
)
// Network packet structure
//
// [ Big-edian ]
// Header (12 Bytes)
// Body (n Bytes)
//
// [ Header structure ]
// -----------------------------------------------------------------------------------
// | magic(2B) | version(1B) | type(1B) | crc32(4B) | length(4B) |
// -----------------------------------------------------------------------------------
// | 0x00201314 | 0x01 | 0x01 | 0xFFFFF | 4096 |
// -----------------------------------------------------------------------------------
//
// [ PacketWrite payload ]
// -------------------------------------------------------------------------------------------------------------------------------------------------
// | cksum(4B) | tag(4B) | shard(4B) | compress(4B) | number(4B) | len(4B) | log([]byte) | len(4B) | log([]byte) |
// -------------------------------------------------------------------------------------------------------------------------------------------------
//
// [ PacketGetACK payload ]
// --------------|
// | (zero) |
// --------------|
//
// [ PacketReturnACK payload ]
// ------------------
// | ack(4B) |
// ------------------
//
const (
MagicNumber = 0xCAFE
CurrentVersion = 0x01
HeaderLen = 12
)
const (
PacketIncomplete uint8 = 0x00
PacketGetACK uint8 = 0x01
PacketWrite uint8 = 0x02
PacketReturnACK uint8 = 0x3
UndefinedPacketType uint8 = 0x4
)
const (
TransferChannel = iota
RecvAckChannel
TotalQueueNum
)
const NetworkDefaultTimeout = 60 * time.Second
type Packet struct {
magic uint16
version uint8
typeOf uint8
crc32 uint32
length uint32
payload []byte
}
func NewPacketV1(packetType uint8, payload []byte) *Packet {
return &Packet{magic: MagicNumber, version: CurrentVersion, typeOf: packetType, length: uint32(len(payload)), payload: payload}
}
func (packet *Packet) setPayload(payload []byte) {
packet.payload = payload
packet.length = uint32(len(payload))
}
func (packet *Packet) encode() []byte {
buffer := bytes.Buffer{}
binary.Write(&buffer, binary.BigEndian, packet.magic)
binary.Write(&buffer, binary.BigEndian, packet.version)
binary.Write(&buffer, binary.BigEndian, packet.typeOf)
// TODO: now crc32 is marked zero
binary.Write(&buffer, binary.BigEndian, packet.crc32)
binary.Write(&buffer, binary.BigEndian, packet.length)
buffer.Write(packet.payload)
nimo.AssertTrue(buffer.Len() == (HeaderLen+len(packet.payload)), "write packet header length is bad")
return buffer.Bytes()
}
func (packet *Packet) decodeHeader(buffer []byte) bool {
nimo.AssertTrue(len(buffer) == HeaderLen, "read packet header length is bad")
buf := bytes.NewBuffer(buffer)
binary.Read(buf, binary.BigEndian, &packet.magic)
binary.Read(buf, binary.BigEndian, &packet.version)
binary.Read(buf, binary.BigEndian, &packet.typeOf)
binary.Read(buf, binary.BigEndian, &packet.crc32)
binary.Read(buf, binary.BigEndian, &packet.length)
return packet.valid()
}
func (packet *Packet) valid() bool {
return packet.magic == MagicNumber && packet.version == CurrentVersion &&
packet.typeOf < UndefinedPacketType
}
func (packet *Packet) String() string {
return fmt.Sprintf("[magic:%d, ver:%d, type:%d, crc:%d, len:%d]",
packet.magic, packet.version, packet.typeOf, packet.crc32, packet.length)
}
type TCPWriter struct {
RemoteAddr string
// for tcp stream channel
channel [2]*TcpSocket
ack int64
}
type TcpSocket struct {
addr *net.TCPAddr
socket *net.TCPConn
}
func (tcp *TcpSocket) ensureNetwork() error {
if tcp.socket == nil {
var err error
tcp.socket, err = net.DialTCP("tcp4", nil, tcp.addr)
if err != nil {
LOG.Critical("channel connect to %s error %s", tcp.addr.String(), err.Error())
return err
}
tcp.socket.SetNoDelay(false)
// linger policy is not required. our data kept in sender util acked
tcp.socket.SetLinger(0)
// default 16K. we set 16MB
tcp.socket.SetWriteBuffer(1024 * 1024 * 16)
}
return nil
}
func (tcp *TcpSocket) release() {
tcp.socket.Close()
tcp.socket = nil
}
func (writer *TCPWriter) pollRemoteAckValue() {
queryAck := NewPacketV1(PacketGetACK, nil).encode()
header := [HeaderLen]byte{}
tcp := writer.channel[RecvAckChannel]
nimo.GoRoutineInLoop(func() {
defer utils.DelayFor(1000)
if tcp.ensureNetwork() != nil {
return
}
// send get ack request
socketTimeout(tcp.socket, NetworkDefaultTimeout)
tcp.socket.Write(queryAck)
// read util we got a entire header
if _, err := io.ReadAtLeast(tcp.socket, header[:], HeaderLen); err != nil {
tcpErrorAndRelease(tcp, err.Error())
return
}
result := NewPacketV1(PacketIncomplete, nil)
if !result.decodeHeader(header[:]) {
tcpErrorAndRelease(tcp, "decode header failed")
return
}
nimo.AssertTrue(result.typeOf == PacketReturnACK && result.length != 4, "acker receive bad type queryAck")
// it's bad response if length < 4
payload := make([]byte, result.length)
if _, err := io.ReadAtLeast(tcp.socket, payload, int(result.length)); err != nil {
tcpErrorAndRelease(tcp, err.Error())
return
}
result.setPayload(payload)
nimo.AssertTrue(result.length == uint32(len(result.payload)) && len(result.payload) != 0,
"acker receive bad payload queryAck")
binary.Read(bytes.NewBuffer(result.payload), binary.BigEndian, &writer.ack)
})
}
func (writer *TCPWriter) Send(message *WMessage) int64 {
tcp := writer.channel[TransferChannel]
var err error
if err = tcp.ensureNetwork(); err != nil {
return ReplyNetworkOpFail
}
message.Tag |= MsgResident
packet := NewPacketV1(PacketWrite, message.ToBytes(binary.BigEndian))
// TODO: no timeout ??
socketTimeout(tcp.socket, 0)
if _, err = tcp.socket.Write(packet.encode()); err != nil {
if err, ok := err.(net.Error); ok && err.Timeout() {
LOG.Warn("Tcp writer send data packet timeout")
return ReplyNetworkTimeout
}
tcp.release()
return ReplyNetworkOpFail
}
return writer.ack
}
func (writer *TCPWriter) Prepare() bool {
var err error
writer.channel = [2]*TcpSocket{new(TcpSocket), new(TcpSocket)}
for i := 0; i != TotalQueueNum; i++ {
writer.channel[i].addr, err = net.ResolveTCPAddr("tcp4", writer.RemoteAddr)
if err != nil {
LOG.Critical("Resolve channel listenAddress error: %s", err.Error())
return false
}
}
writer.channel[RecvAckChannel].addr.Port = writer.channel[TransferChannel].addr.Port + 1
// continuously update the ACK value via separate socket
writer.pollRemoteAckValue()
if !InitialStageChecking {
return true
}
for _, ch := range writer.channel {
if err = ch.ensureNetwork(); err != nil {
return false
}
}
return true
}
func (writer *TCPWriter) AckRequired() bool {
return true
}
func (writer *TCPWriter) ParsedLogsRequired() bool {
return false
}
func socketTimeout(socket *net.TCPConn, duration time.Duration) {
if duration != 0 {
socket.SetWriteDeadline(time.Now().Add(duration))
}
}
func tcpErrorAndRelease(socket *TcpSocket, err string) {
LOG.Critical("tcp operation error and release, %s", err)
socket.release()
}