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package docker

import (

"bytes"

"fmt"

"io"

"net"

"strings"

"testing"

"time"

)

var testBuf = []byte("Buffalo buffalo Buffalo buffalo buffalo buffalo Buffalo buffalo")

var testBufSize = len(testBuf)

type EchoServer interface {

Run()

Close()

LocalAddr() net.Addr

}

type TCPEchoServer struct {

listener net.Listener

testCtx *testing.T

}

type UDPEchoServer struct {

conn net.PacketConn

testCtx *testing.T

}

func NewEchoServer(t *testing.T, proto, address string) EchoServer {

var server EchoServer

if strings.HasPrefix(proto, "tcp") {

listener, err := net.Listen(proto, address)

if err != nil {

t.Fatal(err)

}

server = &TCPEchoServer{listener: listener, testCtx: t}

} else {

socket, err := net.ListenPacket(proto, address)

if err != nil {

t.Fatal(err)

}

server = &UDPEchoServer{conn: socket, testCtx: t}

}

t.Logf("EchoServer listening on %v/%v\n", proto, server.LocalAddr().String())

return server

}

func (server *TCPEchoServer) Run() {

go func() {

for {

client, err := server.listener.Accept()

if err != nil {

return

}

go func(client net.Conn) {

server.testCtx.Logf("TCP client accepted on the EchoServer\n")

written, err := io.Copy(client, client)

server.testCtx.Logf("%v bytes echoed back to the client\n", written)

if err != nil {

server.testCtx.Logf("can't echo to the client: %v\n", err.Error())

}

client.Close()

}(client)

}

}()

}

func (server *TCPEchoServer) LocalAddr() net.Addr { return server.listener.Addr() }

func (server *TCPEchoServer) Close() { server.listener.Addr() }

func (server *UDPEchoServer) Run() {

go func() {

readBuf := make([]byte, 1024)

for {

read, from, err := server.conn.ReadFrom(readBuf)

if err != nil {

return

}

server.testCtx.Logf("Writing UDP datagram back")

for i := 0; i != read; {

written, err := server.conn.WriteTo(readBuf[i:read], from)

if err != nil {

break

}

i += written

}

}

}()

}

func (server *UDPEchoServer) LocalAddr() net.Addr { return server.conn.LocalAddr() }

func (server *UDPEchoServer) Close() { server.conn.Close() }

func testProxyAt(t *testing.T, proto string, proxy Proxy, addr string) {

defer proxy.Close()

go proxy.Run()

client, err := net.Dial(proto, addr)

if err != nil {

t.Fatalf("Can't connect to the proxy: %v", err)

}

defer client.Close()

client.SetDeadline(time.Now().Add(10 * time.Second))

if _, err = client.Write(testBuf); err != nil {

t.Fatal(err)

}

recvBuf := make([]byte, testBufSize)

if _, err = client.Read(recvBuf); err != nil {

t.Fatal(err)

}

if !bytes.Equal(testBuf, recvBuf) {

t.Fatal(fmt.Errorf("Expected [%v] but got [%v]", testBuf, recvBuf))

}

}

func testProxy(t *testing.T, proto string, proxy Proxy) {

testProxyAt(t, proto, proxy, proxy.FrontendAddr().String())

}

func TestTCP4Proxy(t *testing.T) {

backend := NewEchoServer(t, "tcp", "127.0.0.1:0")

defer backend.Close()

backend.Run()

frontendAddr := &net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0}

proxy, err := NewProxy(frontendAddr, backend.LocalAddr())

if err != nil {

t.Fatal(err)

}

testProxy(t, "tcp", proxy)

}

func TestTCP6Proxy(t *testing.T) {

backend := NewEchoServer(t, "tcp", "[::1]:0")

defer backend.Close()

backend.Run()

frontendAddr := &net.TCPAddr{IP: net.IPv6loopback, Port: 0}

proxy, err := NewProxy(frontendAddr, backend.LocalAddr())

if err != nil {

t.Fatal(err)

}

testProxy(t, "tcp", proxy)

}

func TestTCPDualStackProxy(t *testing.T) {

// If I understand `godoc -src net favoriteAddrFamily` (used by the

// net.Listen* functions) correctly this should work, but it doesn't.

t.Skip("No support for dual stack yet")

backend := NewEchoServer(t, "tcp", "[::1]:0")

defer backend.Close()

backend.Run()

frontendAddr := &net.TCPAddr{IP: net.IPv6loopback, Port: 0}

proxy, err := NewProxy(frontendAddr, backend.LocalAddr())

if err != nil {

t.Fatal(err)

}

ipv4ProxyAddr := &net.TCPAddr{

IP: net.IPv4(127, 0, 0, 1),

Port: proxy.FrontendAddr().(*net.TCPAddr).Port,

}

testProxyAt(t, "tcp", proxy, ipv4ProxyAddr.String())

}

func TestUDP4Proxy(t *testing.T) {

backend := NewEchoServer(t, "udp", "127.0.0.1:0")

defer backend.Close()

backend.Run()

frontendAddr := &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0}

proxy, err := NewProxy(frontendAddr, backend.LocalAddr())

if err != nil {

t.Fatal(err)

}

testProxy(t, "udp", proxy)

}

func TestUDP6Proxy(t *testing.T) {

backend := NewEchoServer(t, "udp", "[::1]:0")

defer backend.Close()

backend.Run()

frontendAddr := &net.UDPAddr{IP: net.IPv6loopback, Port: 0}

proxy, err := NewProxy(frontendAddr, backend.LocalAddr())

if err != nil {

t.Fatal(err)

}

testProxy(t, "udp", proxy)

}

func TestUDPWriteError(t *testing.T) {

frontendAddr := &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 0}

// Hopefully, this port will be free: */

backendAddr := &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 25587}

proxy, err := NewProxy(frontendAddr, backendAddr)

if err != nil {

t.Fatal(err)

}

defer proxy.Close()

go proxy.Run()

client, err := net.Dial("udp", "127.0.0.1:25587")

if err != nil {

t.Fatalf("Can't connect to the proxy: %v", err)

}

defer client.Close()

// Make sure the proxy doesn't stop when there is no actual backend:

client.Write(testBuf)

client.Write(testBuf)

backend := NewEchoServer(t, "udp", "127.0.0.1:25587")

defer backend.Close()

backend.Run()

client.SetDeadline(time.Now().Add(10 * time.Second))

if _, err = client.Write(testBuf); err != nil {

t.Fatal(err)

}

recvBuf := make([]byte, testBufSize)

if _, err = client.Read(recvBuf); err != nil {

t.Fatal(err)

}

if !bytes.Equal(testBuf, recvBuf) {

t.Fatal(fmt.Errorf("Expected [%v] but got [%v]", testBuf, recvBuf))

}

}