traefik/pkg/tcp/proxy.go

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package tcp
import (
"io"
"net"
"time"
2019-08-03 01:58:23 +00:00
"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().Debugf("Error while terminating connection: %v", errClose)
return
}
if p.terminationDelay >= 0 {
err := dst.SetReadDeadline(time.Now().Add(p.terminationDelay))
if err != nil {
log.WithoutContext().Debugf("Error while setting deadline: %v", err)
}
}
}