71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
package tcp
|
|
|
|
import (
|
|
"io"
|
|
"net"
|
|
"time"
|
|
|
|
"github.com/containous/traefik/v2/pkg/log"
|
|
)
|
|
|
|
// Proxy forwards a TCP request to a TCP service
|
|
type Proxy struct {
|
|
target *net.TCPAddr
|
|
terminationDelay time.Duration
|
|
}
|
|
|
|
// NewProxy creates a new Proxy
|
|
func NewProxy(address string, terminationDelay time.Duration) (*Proxy, error) {
|
|
tcpAddr, err := net.ResolveTCPAddr("tcp", address)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &Proxy{target: tcpAddr, terminationDelay: terminationDelay}, nil
|
|
}
|
|
|
|
// ServeTCP forwards the connection to a service
|
|
func (p *Proxy) ServeTCP(conn WriteCloser) {
|
|
log.Debugf("Handling connection from %s", conn.RemoteAddr())
|
|
|
|
// needed because of e.g. server.trackedConnection
|
|
defer conn.Close()
|
|
|
|
connBackend, err := net.DialTCP("tcp", nil, p.target)
|
|
if err != nil {
|
|
log.Errorf("Error while connection to backend: %v", err)
|
|
return
|
|
}
|
|
|
|
// maybe not needed, but just in case
|
|
defer connBackend.Close()
|
|
|
|
errChan := make(chan error)
|
|
go p.connCopy(conn, connBackend, errChan)
|
|
go p.connCopy(connBackend, conn, errChan)
|
|
|
|
err = <-errChan
|
|
if err != nil {
|
|
log.WithoutContext().Errorf("Error during connection: %v", err)
|
|
}
|
|
|
|
<-errChan
|
|
}
|
|
|
|
func (p Proxy) connCopy(dst, src WriteCloser, errCh chan error) {
|
|
_, err := io.Copy(dst, src)
|
|
errCh <- err
|
|
|
|
errClose := dst.CloseWrite()
|
|
if errClose != nil {
|
|
log.WithoutContext().Errorf("Error while terminating connection: %v", errClose)
|
|
}
|
|
|
|
if p.terminationDelay >= 0 {
|
|
err := dst.SetReadDeadline(time.Now().Add(p.terminationDelay))
|
|
if err != nil {
|
|
log.WithoutContext().Errorf("Error while setting deadline: %v", err)
|
|
}
|
|
}
|
|
}
|