/
transport_tcp.go
363 lines (300 loc) · 8.39 KB
/
transport_tcp.go
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// Package tcp provides a TCP transport
package transport
import (
"bufio"
"context"
"crypto/tls"
"encoding/binary"
"errors"
"fmt"
"hash/crc32"
"io"
"net"
"sync"
"time"
maddr "github.com/micro/go-micro/v2/util/addr"
mnet "github.com/micro/go-micro/v2/util/net"
mls "github.com/micro/go-micro/v2/util/tls"
"github.com/east-eden/server/transport/codec"
"github.com/east-eden/server/transport/writer"
)
var (
tcpRecvBufMax = 1024 * 1024 * 2 // tcp recv buf
)
func newTcpTransportSocket() interface{} {
return &tcpTransportSocket{
codecs: []codec.Marshaler{&codec.ProtoBufMarshaler{}, &codec.JsonMarshaler{}},
}
}
type tcpTransport struct {
opts Options
}
func (t *tcpTransport) Init(opts ...Option) error {
for _, o := range opts {
o(&t.opts)
}
return nil
}
func (t *tcpTransport) Options() Options {
return t.opts
}
func (t *tcpTransport) Protocol() string {
return "tcp"
}
func (t *tcpTransport) Dial(addr string, opts ...DialOption) (Socket, error) {
dopts := DialOptions{
Timeout: DefaultDialTimeout,
}
for _, opt := range opts {
opt(&dopts)
}
var conn net.Conn
var err error
// TODO: support dial option here rather than using internal config
if t.opts.Secure || t.opts.TLSConfig != nil {
config := t.opts.TLSConfig
if config == nil {
config = &tls.Config{
InsecureSkipVerify: true,
}
}
conn, err = tls.DialWithDialer(&net.Dialer{Timeout: dopts.Timeout}, "tcp", addr, config)
} else {
conn, err = net.DialTimeout("tcp", addr, dopts.Timeout)
}
if err != nil {
return nil, err
}
return &tcpTransportSocket{
conn: conn,
writer: writer.NewWriter(bufio.NewWriterSize(conn, writer.DefaultWriterSize), -1),
reader: bufio.NewReader(conn),
codecs: []codec.Marshaler{&codec.ProtoBufMarshaler{}, &codec.JsonMarshaler{}},
timeout: t.opts.Timeout,
evictedHandle: []func(Socket){},
closed: false,
}, nil
}
func (t *tcpTransport) ListenAndServe(ctx context.Context, addr string, handler TransportHandler, opts ...ListenOption) error {
l, err := t.Listen(addr, opts...)
if err != nil {
return err
}
defer l.Close()
return l.Accept(ctx, handler)
}
func (t *tcpTransport) Listen(addr string, opts ...ListenOption) (Listener, error) {
var options ListenOptions
for _, o := range opts {
o(&options)
}
var l net.Listener
var err error
// TODO: support use of listen options
if t.opts.Secure || t.opts.TLSConfig != nil {
config := t.opts.TLSConfig
fn := func(addr string) (net.Listener, error) {
if config == nil {
hosts := []string{addr}
// check if its a valid host:port
if host, _, err := net.SplitHostPort(addr); err == nil {
if len(host) == 0 {
hosts = maddr.IPs()
} else {
hosts = []string{host}
}
}
// generate a certificate
cert, err := mls.Certificate(hosts...)
if err != nil {
return nil, err
}
config = &tls.Config{Certificates: []tls.Certificate{cert}}
}
return tls.Listen("tcp", addr, config)
}
l, err = mnet.Listen(addr, fn)
} else {
fn := func(addr string) (net.Listener, error) {
return net.Listen("tcp", addr)
}
l, err = mnet.Listen(addr, fn)
}
if err != nil {
return nil, err
}
ls := &tcpTransportListener{
timeout: t.opts.Timeout,
listener: l,
}
ls.sockPool.New = newTcpTransportSocket
return ls, nil
}
type tcpTransportListener struct {
listener net.Listener
timeout time.Duration
sockPool sync.Pool
}
func (t *tcpTransportListener) Addr() string {
return t.listener.Addr().String()
}
func (t *tcpTransportListener) Close() error {
return t.listener.Close()
}
func (t *tcpTransportListener) Accept(ctx context.Context, fn TransportHandler) error {
var tempDelay time.Duration
for {
select {
case <-ctx.Done():
return nil
default:
}
c, err := t.listener.Accept()
if err != nil {
if ne, ok := err.(net.Error); ok && ne.Temporary() {
if tempDelay == 0 {
tempDelay = 5 * time.Millisecond
} else {
tempDelay *= 2
}
if max := 1 * time.Second; tempDelay > max {
tempDelay = max
}
fmt.Printf("tcp: Accept error: %v; retrying in %v\n", err, tempDelay)
time.Sleep(tempDelay)
continue
}
return err
}
sock := t.sockPool.Get().(*tcpTransportSocket)
sock.conn = c
sock.reader = bufio.NewReader(sock.conn)
sock.writer = writer.NewWriter(bufio.NewWriterSize(sock.conn, writer.DefaultWriterSize), writer.DefaultWriterLatency)
sock.timeout = t.timeout
sock.evictedHandle = []func(Socket){}
sock.closed = false
// callback with exit func
subCtx, cancel := context.WithCancel(ctx)
fn(subCtx, sock, func() {
cancel()
sock.Close()
t.sockPool.Put(sock)
})
}
}
type tcpTransportSocket struct {
conn net.Conn
writer writer.Writer
reader *bufio.Reader
codecs []codec.Marshaler
timeout time.Duration
evictedHandle []func(Socket)
closed bool
}
func (t *tcpTransportSocket) Local() string {
return t.conn.LocalAddr().String()
}
func (t *tcpTransportSocket) Remote() string {
return t.conn.RemoteAddr().String()
}
func (t *tcpTransportSocket) AddEvictedHandle(f func(Socket)) {
t.evictedHandle = append(t.evictedHandle, f)
}
func (t *tcpTransportSocket) Close() error {
for _, handle := range t.evictedHandle {
handle(t)
}
t.writer.Stop()
t.closed = true
return t.conn.Close()
}
func (t *tcpTransportSocket) IsClosed() bool {
return t.closed
}
func (t *tcpTransportSocket) Recv(r Register) (*Message, *MessageHandler, error) {
if t.IsClosed() {
return nil, nil, errors.New("tcpTransportSocket.Recv failed: socket closed")
}
// set timeout if its greater than 0
if t.timeout > time.Duration(0) {
if err := t.conn.SetDeadline(time.Now().Add(t.timeout)); err != nil {
return nil, nil, err
}
}
// Message Header:
// 2 bytes message size, size = all_size - Header(6 bytes)
// 4 bytes message name crc32 id,
// Message Body:
var header [10]byte
if _, err := io.ReadFull(t.reader, header[:]); err != nil {
return nil, nil, fmt.Errorf("tcpTransportSocket.Recv header failed: %w", err)
}
var msgLen uint16
// var msgType uint16
var nameCrc uint32
msgLen = binary.LittleEndian.Uint16(header[:2])
// msgType = binary.LittleEndian.Uint16(header[4:6])
nameCrc = binary.LittleEndian.Uint32(header[2:6])
// check len
// if msgLen > math.MaxUint16 || msgLen < 0 {
// return nil, nil, fmt.Errorf("tcpTransportSocket.Recv failed: message length<%d> too long", msgLen)
// }
// check msg type
// if msgType < BodyBegin || msgType >= BodyEnd {
// return nil, nil, fmt.Errorf("tcpTransportSocket.Recv failed: marshal type<%d> error", msgType)
// }
// read body bytes
bodyData := make([]byte, msgLen)
if _, err := io.ReadFull(t.reader, bodyData); err != nil {
return nil, nil, fmt.Errorf("tcpTransportSocket.Recv body failed: %w", err)
}
// get register handler
h, err := r.GetHandler(nameCrc)
if err != nil {
return nil, nil, fmt.Errorf("tcpTransportSocket.Recv failed: %w", err)
}
var message Message
// message.Type = codec.CodecType(msgType)
message.Name = h.Name
// message.Body, err = t.codecs[message.Type].Unmarshal(bodyData, h.RType)
message.Body, err = t.codecs[0].Unmarshal(bodyData, h.RType)
if err != nil {
return nil, nil, fmt.Errorf("tcpTransportSocket.Recv unmarshal message body failed: %w", err)
}
return &message, h, err
}
func (t *tcpTransportSocket) Send(m *Message) error {
// set timeout if its greater than 0
if t.timeout > time.Duration(0) {
if err := t.conn.SetDeadline(time.Now().Add(t.timeout)); err != nil {
return err
}
}
// if m.Type < BodyBegin || m.Type >= BodyEnd {
// return fmt.Errorf("tcpTransportSocket.Send marshal type<%d> error", m.Type)
// }
// body, err := t.codecs[m.Type].Marshal(m.Body)
body, err := t.codecs[0].Marshal(m.Body)
if err != nil {
return err
}
// Message Header:
// 2 bytes message size, size = all_size - Header(6 bytes)
// 4 bytes message name crc32 id,
// Message Body:
var bodySize uint16 = uint16(len(body))
// items := strings.Split(m.Name, ".")
// protoName := items[len(items)-1]
var nameCrc uint32 = crc32.ChecksumIEEE([]byte(m.Name))
var header []byte = make([]byte, 10)
binary.LittleEndian.PutUint16(header[:2], bodySize)
// binary.LittleEndian.PutUint16(header[4:6], uint16(m.Type))
binary.LittleEndian.PutUint32(header[2:6], uint32(nameCrc))
if _, err := t.writer.Write(header); err != nil {
return err
}
if _, err := t.writer.Write(body); err != nil {
return err
}
return nil
}