/
tcp.go
286 lines (239 loc) · 5.88 KB
/
tcp.go
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// Package tcp provides a TCP transport
package tcp
import (
"bufio"
"crypto/tls"
"encoding/gob"
"errors"
"net"
"time"
"github.com/asim/go-micro/v3/cmd"
log "github.com/asim/go-micro/v3/logger"
"github.com/asim/go-micro/v3/transport"
maddr "github.com/asim/go-micro/v3/util/addr"
mnet "github.com/asim/go-micro/v3/util/net"
mls "github.com/asim/go-micro/v3/util/tls"
)
type tcpTransport struct {
opts transport.Options
}
type tcpTransportClient struct {
dialOpts transport.DialOptions
conn net.Conn
enc *gob.Encoder
dec *gob.Decoder
encBuf *bufio.Writer
timeout time.Duration
}
type tcpTransportSocket struct {
conn net.Conn
enc *gob.Encoder
dec *gob.Decoder
encBuf *bufio.Writer
timeout time.Duration
}
type tcpTransportListener struct {
listener net.Listener
timeout time.Duration
}
func init() {
cmd.DefaultTransports["tcp"] = NewTransport
}
func (t *tcpTransportClient) Local() string {
return t.conn.LocalAddr().String()
}
func (t *tcpTransportClient) Remote() string {
return t.conn.RemoteAddr().String()
}
func (t *tcpTransportClient) Send(m *transport.Message) error {
// set timeout if its greater than 0
if t.timeout > time.Duration(0) {
t.conn.SetDeadline(time.Now().Add(t.timeout))
}
if err := t.enc.Encode(m); err != nil {
return err
}
return t.encBuf.Flush()
}
func (t *tcpTransportClient) Recv(m *transport.Message) error {
// set timeout if its greater than 0
if t.timeout > time.Duration(0) {
t.conn.SetDeadline(time.Now().Add(t.timeout))
}
return t.dec.Decode(&m)
}
func (t *tcpTransportClient) Close() error {
return t.conn.Close()
}
func (t *tcpTransportSocket) Local() string {
return t.conn.LocalAddr().String()
}
func (t *tcpTransportSocket) Remote() string {
return t.conn.RemoteAddr().String()
}
func (t *tcpTransportSocket) Recv(m *transport.Message) error {
if m == nil {
return errors.New("message passed in is nil")
}
// set timeout if its greater than 0
if t.timeout > time.Duration(0) {
t.conn.SetDeadline(time.Now().Add(t.timeout))
}
return t.dec.Decode(&m)
}
func (t *tcpTransportSocket) Send(m *transport.Message) error {
// set timeout if its greater than 0
if t.timeout > time.Duration(0) {
t.conn.SetDeadline(time.Now().Add(t.timeout))
}
if err := t.enc.Encode(m); err != nil {
return err
}
return t.encBuf.Flush()
}
func (t *tcpTransportSocket) Close() error {
return t.conn.Close()
}
func (t *tcpTransportListener) Addr() string {
return t.listener.Addr().String()
}
func (t *tcpTransportListener) Close() error {
return t.listener.Close()
}
func (t *tcpTransportListener) Accept(fn func(transport.Socket)) error {
var tempDelay time.Duration
for {
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
}
log.Errorf("http: Accept error: %v; retrying in %v\n", err, tempDelay)
time.Sleep(tempDelay)
continue
}
return err
}
encBuf := bufio.NewWriter(c)
sock := &tcpTransportSocket{
timeout: t.timeout,
conn: c,
encBuf: encBuf,
enc: gob.NewEncoder(encBuf),
dec: gob.NewDecoder(c),
}
go func() {
// TODO: think of a better error response strategy
defer func() {
if r := recover(); r != nil {
sock.Close()
}
}()
fn(sock)
}()
}
}
func (t *tcpTransport) Dial(addr string, opts ...transport.DialOption) (transport.Client, error) {
dopts := transport.DialOptions{
Timeout: transport.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
}
encBuf := bufio.NewWriter(conn)
return &tcpTransportClient{
dialOpts: dopts,
conn: conn,
encBuf: encBuf,
enc: gob.NewEncoder(encBuf),
dec: gob.NewDecoder(conn),
timeout: t.opts.Timeout,
}, nil
}
func (t *tcpTransport) Listen(addr string, opts ...transport.ListenOption) (transport.Listener, error) {
var options transport.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
}
return &tcpTransportListener{
timeout: t.opts.Timeout,
listener: l,
}, nil
}
func (t *tcpTransport) Init(opts ...transport.Option) error {
for _, o := range opts {
o(&t.opts)
}
return nil
}
func (t *tcpTransport) Options() transport.Options {
return t.opts
}
func (t *tcpTransport) String() string {
return "tcp"
}
func NewTransport(opts ...transport.Option) transport.Transport {
var options transport.Options
for _, o := range opts {
o(&options)
}
return &tcpTransport{opts: options}
}