traefik/pkg/server/middleware/middlewares_test.go

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package middleware
import (
"context"
"errors"
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"net/http"
"net/http/httptest"
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"testing"
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"github.com/containous/traefik/pkg/config"
"github.com/containous/traefik/pkg/server/internal"
"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
)
func TestBuilder_BuildChainNilConfig(t *testing.T) {
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testConfig := map[string]*config.Middleware{
"empty": {},
}
middlewaresBuilder := NewBuilder(testConfig, nil)
chain := middlewaresBuilder.BuildChain(context.Background(), []string{"empty"})
_, err := chain.Then(nil)
require.Error(t, err)
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}
func TestBuilder_BuildChainNonExistentChain(t *testing.T) {
testConfig := map[string]*config.Middleware{
"foobar": {},
}
middlewaresBuilder := NewBuilder(testConfig, nil)
chain := middlewaresBuilder.BuildChain(context.Background(), []string{"empty"})
_, err := chain.Then(nil)
require.Error(t, err)
}
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func TestBuilder_BuildChainWithContext(t *testing.T) {
testCases := []struct {
desc string
buildChain []string
configuration map[string]*config.Middleware
expected map[string]string
contextProvider string
expectedError error
}{
{
desc: "Simple middleware",
buildChain: []string{"middleware-1"},
configuration: map[string]*config.Middleware{
"middleware-1": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"middleware-1": "value-middleware-1"},
},
},
},
expected: map[string]string{"middleware-1": "value-middleware-1"},
},
{
desc: "Middleware that references a chain",
buildChain: []string{"middleware-chain-1"},
configuration: map[string]*config.Middleware{
"middleware-1": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"middleware-1": "value-middleware-1"},
},
},
"middleware-chain-1": {
Chain: &config.Chain{
Middlewares: []string{"middleware-1"},
},
},
},
expected: map[string]string{"middleware-1": "value-middleware-1"},
},
{
desc: "Should prefix the middlewareName with the provider in the context",
buildChain: []string{"middleware-1"},
configuration: map[string]*config.Middleware{
"provider-1.middleware-1": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"provider-1.middleware-1": "value-middleware-1"},
},
},
},
expected: map[string]string{"provider-1.middleware-1": "value-middleware-1"},
contextProvider: "provider-1",
},
{
desc: "Should not prefix a qualified middlewareName with the provider in the context",
buildChain: []string{"provider-1.middleware-1"},
configuration: map[string]*config.Middleware{
"provider-1.middleware-1": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"provider-1.middleware-1": "value-middleware-1"},
},
},
},
expected: map[string]string{"provider-1.middleware-1": "value-middleware-1"},
contextProvider: "provider-1",
},
{
desc: "Should be context aware if a chain references another middleware",
buildChain: []string{"provider-1.middleware-chain-1"},
configuration: map[string]*config.Middleware{
"provider-1.middleware-1": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"middleware-1": "value-middleware-1"},
},
},
"provider-1.middleware-chain-1": {
Chain: &config.Chain{
Middlewares: []string{"middleware-1"},
},
},
},
expected: map[string]string{"middleware-1": "value-middleware-1"},
},
{
desc: "Should handle nested chains with different context",
buildChain: []string{"provider-1.middleware-chain-1", "middleware-chain-1"},
configuration: map[string]*config.Middleware{
"provider-1.middleware-1": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"middleware-1": "value-middleware-1"},
},
},
"provider-1.middleware-2": {
Headers: &config.Headers{
CustomRequestHeaders: map[string]string{"middleware-2": "value-middleware-2"},
},
},
"provider-1.middleware-chain-1": {
Chain: &config.Chain{
Middlewares: []string{"middleware-1"},
},
},
"provider-1.middleware-chain-2": {
Chain: &config.Chain{
Middlewares: []string{"middleware-2"},
},
},
"provider-2.middleware-chain-1": {
Chain: &config.Chain{
Middlewares: []string{"provider-1.middleware-2", "provider-1.middleware-chain-2"},
},
},
},
expected: map[string]string{"middleware-1": "value-middleware-1", "middleware-2": "value-middleware-2"},
contextProvider: "provider-2",
},
{
desc: "Detects recursion in Middleware chain",
buildChain: []string{"m1"},
configuration: map[string]*config.Middleware{
"ok": {
Retry: &config.Retry{},
},
"m1": {
Chain: &config.Chain{
Middlewares: []string{"m2"},
},
},
"m2": {
Chain: &config.Chain{
Middlewares: []string{"ok", "m3"},
},
},
"m3": {
Chain: &config.Chain{
Middlewares: []string{"m1"},
},
},
},
expectedError: errors.New("could not instantiate middleware m1: recursion detected in m1->m2->m3->m1"),
},
{
desc: "Detects recursion in Middleware chain",
buildChain: []string{"provider.m1"},
configuration: map[string]*config.Middleware{
"provider2.ok": {
Retry: &config.Retry{},
},
"provider.m1": {
Chain: &config.Chain{
Middlewares: []string{"provider2.m2"},
},
},
"provider2.m2": {
Chain: &config.Chain{
Middlewares: []string{"ok", "provider.m3"},
},
},
"provider.m3": {
Chain: &config.Chain{
Middlewares: []string{"m1"},
},
},
},
expectedError: errors.New("could not instantiate middleware provider.m1: recursion detected in provider.m1->provider2.m2->provider.m3->provider.m1"),
},
{
buildChain: []string{"ok", "m0"},
configuration: map[string]*config.Middleware{
"ok": {
Retry: &config.Retry{},
},
"m0": {
Chain: &config.Chain{
Middlewares: []string{"m0"},
},
},
},
expectedError: errors.New("could not instantiate middleware m0: recursion detected in m0->m0"),
},
{
desc: "Detects MiddlewareChain that references a Chain that references a Chain with a missing middleware",
buildChain: []string{"m0"},
configuration: map[string]*config.Middleware{
"m0": {
Chain: &config.Chain{
Middlewares: []string{"m1"},
},
},
"m1": {
Chain: &config.Chain{
Middlewares: []string{"m2"},
},
},
"m2": {
Chain: &config.Chain{
Middlewares: []string{"m3"},
},
},
"m3": {
Chain: &config.Chain{
Middlewares: []string{"m2"},
},
},
},
expectedError: errors.New("could not instantiate middleware m2: recursion detected in m0->m1->m2->m3->m2"),
},
{
desc: "--",
buildChain: []string{"m0"},
configuration: map[string]*config.Middleware{
"m0": {
Chain: &config.Chain{
Middlewares: []string{"m0"},
},
},
},
expectedError: errors.New("could not instantiate middleware m0: recursion detected in m0->m0"),
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
ctx := context.Background()
if len(test.contextProvider) > 0 {
ctx = internal.AddProviderInContext(ctx, test.contextProvider+".foobar")
}
builder := NewBuilder(test.configuration, nil)
result := builder.BuildChain(ctx, test.buildChain)
handlers, err := result.Then(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusOK) }))
if test.expectedError != nil {
require.NotNil(t, err)
require.Equal(t, test.expectedError.Error(), err.Error())
} else {
require.NoError(t, err)
recorder := httptest.NewRecorder()
request, _ := http.NewRequest(http.MethodGet, "http://foo/", nil)
handlers.ServeHTTP(recorder, request)
for key, value := range test.expected {
assert.Equal(t, value, request.Header.Get(key))
}
}
})
}
}
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func TestBuilder_buildConstructor(t *testing.T) {
testConfig := map[string]*config.Middleware{
"cb-empty": {
CircuitBreaker: &config.CircuitBreaker{
Expression: "",
},
},
"cb-foo": {
CircuitBreaker: &config.CircuitBreaker{
Expression: "NetworkErrorRatio() > 0.5",
},
},
"ap-empty": {
AddPrefix: &config.AddPrefix{
Prefix: "",
},
},
"ap-foo": {
AddPrefix: &config.AddPrefix{
Prefix: "foo/",
},
},
}
middlewaresBuilder := NewBuilder(testConfig, nil)
testCases := []struct {
desc string
middlewareID string
expectedError bool
}{
{
desc: "Should fail at creating a circuit breaker with an empty expression",
middlewareID: "cb-empty",
expectedError: true,
},
{
desc: "Should create a circuit breaker with a valid expression",
middlewareID: "cb-foo",
expectedError: false,
},
{
desc: "Should not create an empty AddPrefix middleware when given an empty prefix",
middlewareID: "ap-empty",
expectedError: true,
},
{
desc: "Should create an AddPrefix middleware when given a valid configuration",
middlewareID: "ap-foo",
expectedError: false,
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
constructor, err := middlewaresBuilder.buildConstructor(context.Background(), test.middlewareID, *testConfig[test.middlewareID])
require.NoError(t, err)
middleware, err2 := constructor(http.HandlerFunc(func(_ http.ResponseWriter, _ *http.Request) {}))
if test.expectedError {
require.Error(t, err2)
} else {
require.NoError(t, err)
require.NotNil(t, middleware)
}
})
}
}