traefik/pkg/server/service/service_test.go

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package service
import (
"context"
"io"
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"net/http"
"net/http/httptest"
"net/http/httptrace"
"net/textproto"
"strings"
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"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
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"github.com/traefik/traefik/v3/pkg/config/dynamic"
"github.com/traefik/traefik/v3/pkg/config/runtime"
"github.com/traefik/traefik/v3/pkg/server/provider"
"github.com/traefik/traefik/v3/pkg/testhelpers"
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)
func TestGetLoadBalancer(t *testing.T) {
sm := Manager{
roundTripperManager: newRtMock(),
}
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testCases := []struct {
desc string
serviceName string
service *dynamic.ServersLoadBalancer
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fwd http.Handler
expectError bool
}{
{
desc: "Fails when provided an invalid URL",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{
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{
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URL: ":",
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},
},
},
fwd: &MockForwarder{},
expectError: true,
},
{
desc: "Succeeds when there are no servers",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{},
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fwd: &MockForwarder{},
expectError: false,
},
{
desc: "Succeeds when sticky.cookie is set",
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serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Sticky: &dynamic.Sticky{Cookie: &dynamic.Cookie{}},
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},
fwd: &MockForwarder{},
expectError: false,
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
serviceInfo := &runtime.ServiceInfo{Service: &dynamic.Service{LoadBalancer: test.service}}
handler, err := sm.getLoadBalancerServiceHandler(context.Background(), test.serviceName, serviceInfo)
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if test.expectError {
require.Error(t, err)
assert.Nil(t, handler)
} else {
require.NoError(t, err)
assert.NotNil(t, handler)
}
})
}
}
func TestGetLoadBalancerServiceHandler(t *testing.T) {
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sm := NewManager(nil, nil, nil, &RoundTripperManager{
roundTrippers: map[string]http.RoundTripper{
"default@internal": http.DefaultTransport,
},
})
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server1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "first")
}))
t.Cleanup(server1.Close)
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server2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "second")
}))
t.Cleanup(server2.Close)
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serverPassHost := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "passhost")
assert.Equal(t, "callme", r.Host)
}))
t.Cleanup(serverPassHost.Close)
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serverPassHostFalse := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "passhostfalse")
assert.NotEqual(t, "callme", r.Host)
}))
t.Cleanup(serverPassHostFalse.Close)
hasNoUserAgent := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Empty(t, r.Header.Get("User-Agent"))
}))
t.Cleanup(hasNoUserAgent.Close)
hasUserAgent := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
assert.Equal(t, "foobar", r.Header.Get("User-Agent"))
}))
t.Cleanup(hasUserAgent.Close)
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type ExpectedResult struct {
StatusCode int
XFrom string
LoadBalanced bool
SecureCookie bool
HTTPOnlyCookie bool
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}
testCases := []struct {
desc string
serviceName string
service *dynamic.ServersLoadBalancer
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responseModifier func(*http.Response) error
cookieRawValue string
userAgent string
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expected []ExpectedResult
}{
{
desc: "Load balances between the two servers",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
PassHostHeader: Bool(true),
Servers: []dynamic.Server{
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{
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URL: server1.URL,
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},
{
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URL: server2.URL,
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},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
LoadBalanced: true,
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},
{
StatusCode: http.StatusOK,
LoadBalanced: true,
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},
},
},
{
desc: "StatusBadGateway when the server is not reachable",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{
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{
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URL: "http://foo",
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},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusBadGateway,
},
},
},
{
desc: "ServiceUnavailable when no servers are available",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{},
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},
expected: []ExpectedResult{
{
StatusCode: http.StatusServiceUnavailable,
},
},
},
{
desc: "Always call the same server when sticky.cookie is true",
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serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Sticky: &dynamic.Sticky{Cookie: &dynamic.Cookie{}},
Servers: []dynamic.Server{
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{
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URL: server1.URL,
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},
{
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URL: server2.URL,
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},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
},
{
StatusCode: http.StatusOK,
},
},
},
{
desc: "Sticky Cookie's options set correctly",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Sticky: &dynamic.Sticky{Cookie: &dynamic.Cookie{HTTPOnly: true, Secure: true}},
Servers: []dynamic.Server{
{
URL: server1.URL,
},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "first",
SecureCookie: true,
HTTPOnlyCookie: true,
},
},
},
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{
desc: "PassHost passes the host instead of the IP",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Sticky: &dynamic.Sticky{Cookie: &dynamic.Cookie{}},
PassHostHeader: func(v bool) *bool { return &v }(true),
Servers: []dynamic.Server{
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{
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URL: serverPassHost.URL,
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},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "passhost",
},
},
},
{
desc: "PassHost doesn't pass the host instead of the IP",
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serviceName: "test",
service: &dynamic.ServersLoadBalancer{
PassHostHeader: Bool(false),
Sticky: &dynamic.Sticky{Cookie: &dynamic.Cookie{}},
Servers: []dynamic.Server{
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{
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URL: serverPassHostFalse.URL,
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},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "passhostfalse",
},
},
},
{
desc: "No user-agent",
serviceName: "test",
service: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{
{
URL: hasNoUserAgent.URL,
},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
},
},
},
{
desc: "Custom user-agent",
serviceName: "test",
userAgent: "foobar",
service: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{
{
URL: hasUserAgent.URL,
},
},
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
},
},
},
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}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
serviceInfo := &runtime.ServiceInfo{Service: &dynamic.Service{LoadBalancer: test.service}}
handler, err := sm.getLoadBalancerServiceHandler(context.Background(), test.serviceName, serviceInfo)
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assert.NoError(t, err)
assert.NotNil(t, handler)
req := testhelpers.MustNewRequest(http.MethodGet, "http://callme", nil)
assert.Equal(t, "", req.Header.Get("User-Agent"))
if test.userAgent != "" {
req.Header.Set("User-Agent", test.userAgent)
}
if test.cookieRawValue != "" {
req.Header.Set("Cookie", test.cookieRawValue)
}
var prevXFrom string
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for _, expected := range test.expected {
recorder := httptest.NewRecorder()
handler.ServeHTTP(recorder, req)
assert.Equal(t, expected.StatusCode, recorder.Code)
if expected.XFrom != "" {
assert.Equal(t, expected.XFrom, recorder.Header().Get("X-From"))
}
xFrom := recorder.Header().Get("X-From")
if prevXFrom != "" {
if expected.LoadBalanced {
assert.NotEqual(t, prevXFrom, xFrom)
} else {
assert.Equal(t, prevXFrom, xFrom)
}
}
prevXFrom = xFrom
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cookieHeader := recorder.Header().Get("Set-Cookie")
if len(cookieHeader) > 0 {
req.Header.Set("Cookie", cookieHeader)
assert.Equal(t, expected.SecureCookie, strings.Contains(cookieHeader, "Secure"))
assert.Equal(t, expected.HTTPOnlyCookie, strings.Contains(cookieHeader, "HttpOnly"))
assert.NotContains(t, cookieHeader, "://")
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}
}
})
}
}
// This test is an adapted version of net/http/httputil.Test1xxResponses test.
func Test1xxResponses(t *testing.T) {
sm := NewManager(nil, nil, nil, &RoundTripperManager{
roundTrippers: map[string]http.RoundTripper{
"default@internal": http.DefaultTransport,
},
})
backend := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
h := w.Header()
h.Add("Link", "</style.css>; rel=preload; as=style")
h.Add("Link", "</script.js>; rel=preload; as=script")
w.WriteHeader(http.StatusEarlyHints)
h.Add("Link", "</foo.js>; rel=preload; as=script")
w.WriteHeader(http.StatusProcessing)
_, _ = w.Write([]byte("Hello"))
}))
t.Cleanup(backend.Close)
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info := &runtime.ServiceInfo{
Service: &dynamic.Service{
LoadBalancer: &dynamic.ServersLoadBalancer{
Servers: []dynamic.Server{
{
URL: backend.URL,
},
},
},
},
}
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handler, err := sm.getLoadBalancerServiceHandler(context.Background(), "foobar", info)
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assert.NoError(t, err)
frontend := httptest.NewServer(handler)
t.Cleanup(frontend.Close)
frontendClient := frontend.Client()
checkLinkHeaders := func(t *testing.T, expected, got []string) {
t.Helper()
if len(expected) != len(got) {
t.Errorf("Expected %d link headers; got %d", len(expected), len(got))
}
for i := range expected {
if i >= len(got) {
t.Errorf("Expected %q link header; got nothing", expected[i])
continue
}
if expected[i] != got[i] {
t.Errorf("Expected %q link header; got %q", expected[i], got[i])
}
}
}
var respCounter uint8
trace := &httptrace.ClientTrace{
Got1xxResponse: func(code int, header textproto.MIMEHeader) error {
switch code {
case http.StatusEarlyHints:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script"}, header["Link"])
case http.StatusProcessing:
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, header["Link"])
default:
t.Error("Unexpected 1xx response")
}
respCounter++
return nil
},
}
req, _ := http.NewRequestWithContext(httptrace.WithClientTrace(context.Background(), trace), http.MethodGet, frontend.URL, nil)
res, err := frontendClient.Do(req)
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assert.NoError(t, err)
defer res.Body.Close()
if respCounter != 2 {
t.Errorf("Expected 2 1xx responses; got %d", respCounter)
}
checkLinkHeaders(t, []string{"</style.css>; rel=preload; as=style", "</script.js>; rel=preload; as=script", "</foo.js>; rel=preload; as=script"}, res.Header["Link"])
body, _ := io.ReadAll(res.Body)
if string(body) != "Hello" {
t.Errorf("Read body %q; want Hello", body)
}
}
func TestManager_Build(t *testing.T) {
testCases := []struct {
desc string
serviceName string
configs map[string]*runtime.ServiceInfo
providerName string
}{
{
desc: "Simple service name",
serviceName: "serviceName",
configs: map[string]*runtime.ServiceInfo{
"serviceName": {
Service: &dynamic.Service{
LoadBalancer: &dynamic.ServersLoadBalancer{},
},
},
},
},
{
desc: "Service name with provider",
serviceName: "serviceName@provider-1",
configs: map[string]*runtime.ServiceInfo{
"serviceName@provider-1": {
Service: &dynamic.Service{
LoadBalancer: &dynamic.ServersLoadBalancer{},
},
},
},
},
{
desc: "Service name with provider in context",
serviceName: "serviceName",
configs: map[string]*runtime.ServiceInfo{
"serviceName@provider-1": {
Service: &dynamic.Service{
LoadBalancer: &dynamic.ServersLoadBalancer{},
},
},
},
providerName: "provider-1",
},
}
for _, test := range testCases {
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
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manager := NewManager(test.configs, nil, nil, &RoundTripperManager{
roundTrippers: map[string]http.RoundTripper{
"default@internal": http.DefaultTransport,
},
})
ctx := context.Background()
if len(test.providerName) > 0 {
ctx = provider.AddInContext(ctx, "foobar@"+test.providerName)
}
_, err := manager.BuildHTTP(ctx, test.serviceName)
require.NoError(t, err)
})
}
}
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func TestMultipleTypeOnBuildHTTP(t *testing.T) {
services := map[string]*runtime.ServiceInfo{
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"test@file": {
Service: &dynamic.Service{
LoadBalancer: &dynamic.ServersLoadBalancer{},
Weighted: &dynamic.WeightedRoundRobin{},
},
},
}
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manager := NewManager(services, nil, nil, &RoundTripperManager{
roundTrippers: map[string]http.RoundTripper{
"default@internal": http.DefaultTransport,
},
})
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_, err := manager.BuildHTTP(context.Background(), "test@file")
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assert.Error(t, err, "cannot create service: multi-types service not supported, consider declaring two different pieces of service instead")
}
func Bool(v bool) *bool { return &v }
type MockForwarder struct{}
func (MockForwarder) ServeHTTP(http.ResponseWriter, *http.Request) {
panic("not available")
}
type rtMock struct{}
func newRtMock() RoundTripperGetter {
return &rtMock{}
}
func (r *rtMock) Get(_ string) (http.RoundTripper, error) {
return http.DefaultTransport, nil
}