traefik/pkg/server/server_entrypoint_tcp_test.go

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package server
import (
"bufio"
"context"
"errors"
"io"
"net"
"net/http"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
ptypes "github.com/traefik/paerser/types"
"github.com/traefik/traefik/v2/pkg/config/static"
"github.com/traefik/traefik/v2/pkg/tcp"
)
func TestShutdownHijacked(t *testing.T) {
router := &tcp.Router{}
router.HTTPHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
conn, _, err := rw.(http.Hijacker).Hijack()
require.NoError(t, err)
resp := http.Response{StatusCode: http.StatusOK}
err = resp.Write(conn)
require.NoError(t, err)
}))
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testShutdown(t, router)
}
func TestShutdownHTTP(t *testing.T) {
router := &tcp.Router{}
router.HTTPHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.WriteHeader(http.StatusOK)
time.Sleep(time.Second)
}))
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testShutdown(t, router)
}
func TestShutdownTCP(t *testing.T) {
router := &tcp.Router{}
router.AddCatchAllNoTLS(tcp.HandlerFunc(func(conn tcp.WriteCloser) {
for {
_, err := http.ReadRequest(bufio.NewReader(conn))
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if errors.Is(err, io.EOF) || (err != nil && errors.Is(err, net.ErrClosed)) {
return
}
require.NoError(t, err)
resp := http.Response{StatusCode: http.StatusOK}
err = resp.Write(conn)
require.NoError(t, err)
}
}))
testShutdown(t, router)
}
func testShutdown(t *testing.T, router *tcp.Router) {
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t.Helper()
epConfig := &static.EntryPointsTransport{}
epConfig.SetDefaults()
epConfig.LifeCycle.RequestAcceptGraceTimeout = 0
epConfig.LifeCycle.GraceTimeOut = ptypes.Duration(5 * time.Second)
epConfig.RespondingTimeouts.ReadTimeout = ptypes.Duration(5 * time.Second)
epConfig.RespondingTimeouts.WriteTimeout = ptypes.Duration(5 * time.Second)
entryPoint, err := NewTCPEntryPoint(context.Background(), &static.EntryPoint{
// We explicitly use an IPV4 address because on Alpine, with an IPV6 address
// there seems to be shenanigans related to properly cleaning up file descriptors
Address: "127.0.0.1:0",
Transport: epConfig,
ForwardedHeaders: &static.ForwardedHeaders{},
}, nil)
require.NoError(t, err)
conn, err := startEntrypoint(entryPoint, router)
require.NoError(t, err)
epAddr := entryPoint.listener.Addr().String()
request, err := http.NewRequest(http.MethodHead, "http://127.0.0.1:8082", nil)
require.NoError(t, err)
time.Sleep(100 * time.Millisecond)
// We need to do a write on the conn before the shutdown to make it "exist".
// Because the connection indeed exists as far as TCP is concerned,
// but since we only pass it along to the HTTP server after at least one byte is peeked,
// the HTTP server (and hence its shutdown) does not know about the connection until that first byte peeked.
err = request.Write(conn)
require.NoError(t, err)
reader := bufio.NewReader(conn)
// Wait for first byte in response.
_, err = reader.Peek(1)
require.NoError(t, err)
go entryPoint.Shutdown(context.Background())
// Make sure that new connections are not permitted anymore.
// Note that this should be true not only after Shutdown has returned,
// but technically also as early as the Shutdown has closed the listener,
// i.e. during the shutdown and before the gracetime is over.
var testOk bool
for i := 0; i < 10; i++ {
loopConn, err := net.Dial("tcp", epAddr)
if err == nil {
loopConn.Close()
time.Sleep(100 * time.Millisecond)
continue
}
if !strings.HasSuffix(err.Error(), "connection refused") && !strings.HasSuffix(err.Error(), "reset by peer") {
t.Fatalf(`unexpected error: got %v, wanted "connection refused" or "reset by peer"`, err)
}
testOk = true
break
}
if !testOk {
t.Fatal("entry point never closed")
}
// And make sure that the connection we had opened before shutting things down is still operational
resp, err := http.ReadResponse(reader, request)
require.NoError(t, err)
assert.Equal(t, http.StatusOK, resp.StatusCode)
}
func startEntrypoint(entryPoint *TCPEntryPoint, router *tcp.Router) (net.Conn, error) {
go entryPoint.Start(context.Background())
entryPoint.SwitchRouter(router)
for i := 0; i < 10; i++ {
conn, err := net.Dial("tcp", entryPoint.listener.Addr().String())
if err != nil {
time.Sleep(100 * time.Millisecond)
continue
}
return conn, err
}
return nil, errors.New("entry point never started")
}
func TestReadTimeoutWithoutFirstByte(t *testing.T) {
epConfig := &static.EntryPointsTransport{}
epConfig.SetDefaults()
epConfig.RespondingTimeouts.ReadTimeout = ptypes.Duration(2 * time.Second)
entryPoint, err := NewTCPEntryPoint(context.Background(), &static.EntryPoint{
Address: ":0",
Transport: epConfig,
ForwardedHeaders: &static.ForwardedHeaders{},
}, nil)
require.NoError(t, err)
router := &tcp.Router{}
router.HTTPHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.WriteHeader(http.StatusOK)
}))
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conn, err := startEntrypoint(entryPoint, router)
require.NoError(t, err)
errChan := make(chan error)
go func() {
b := make([]byte, 2048)
_, err := conn.Read(b)
errChan <- err
}()
select {
case err := <-errChan:
require.Equal(t, io.EOF, err)
case <-time.Tick(5 * time.Second):
t.Error("Timeout while read")
}
}
func TestReadTimeoutWithFirstByte(t *testing.T) {
epConfig := &static.EntryPointsTransport{}
epConfig.SetDefaults()
epConfig.RespondingTimeouts.ReadTimeout = ptypes.Duration(2 * time.Second)
entryPoint, err := NewTCPEntryPoint(context.Background(), &static.EntryPoint{
Address: ":0",
Transport: epConfig,
ForwardedHeaders: &static.ForwardedHeaders{},
}, nil)
require.NoError(t, err)
router := &tcp.Router{}
router.HTTPHandler(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.WriteHeader(http.StatusOK)
}))
conn, err := startEntrypoint(entryPoint, router)
require.NoError(t, err)
_, err = conn.Write([]byte("GET /some HTTP/1.1\r\n"))
require.NoError(t, err)
errChan := make(chan error)
go func() {
b := make([]byte, 2048)
_, err := conn.Read(b)
errChan <- err
}()
select {
case err := <-errChan:
require.Equal(t, io.EOF, err)
case <-time.Tick(5 * time.Second):
t.Error("Timeout while read")
}
}