traefik/server/service/service_test.go

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2018-11-14 09:18:03 +00:00
package service
import (
"context"
"errors"
"net/http"
"net/http/httptest"
"net/url"
"testing"
"github.com/containous/traefik/config"
"github.com/containous/traefik/testhelpers"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/vulcand/oxy/roundrobin"
)
type MockRR struct {
err error
}
func (*MockRR) Servers() []*url.URL {
panic("implement me")
}
func (*MockRR) ServeHTTP(w http.ResponseWriter, req *http.Request) {
panic("implement me")
}
func (*MockRR) ServerWeight(u *url.URL) (int, bool) {
panic("implement me")
}
func (*MockRR) RemoveServer(u *url.URL) error {
panic("implement me")
}
func (m *MockRR) UpsertServer(u *url.URL, options ...roundrobin.ServerOption) error {
return m.err
}
func (*MockRR) NextServer() (*url.URL, error) {
panic("implement me")
}
func (*MockRR) Next() http.Handler {
panic("implement me")
}
type MockForwarder struct{}
func (MockForwarder) ServeHTTP(http.ResponseWriter, *http.Request) {
panic("implement me")
}
func TestGetLoadBalancer(t *testing.T) {
sm := Manager{}
testCases := []struct {
desc string
serviceName string
service *config.LoadBalancerService
fwd http.Handler
rr balancerHandler
expectError bool
}{
{
desc: "Fails when provided an invalid URL",
serviceName: "test",
service: &config.LoadBalancerService{
Servers: []config.Server{
{
URL: ":",
Weight: 0,
},
},
},
fwd: &MockForwarder{},
rr: &MockRR{},
expectError: true,
},
{
desc: "Fails when the server upsert fails",
serviceName: "test",
service: &config.LoadBalancerService{
Servers: []config.Server{
{
URL: "http://foo",
Weight: 0,
},
},
},
fwd: &MockForwarder{},
rr: &MockRR{err: errors.New("upsert fails")},
expectError: true,
},
{
desc: "Succeeds when there are no servers",
serviceName: "test",
service: &config.LoadBalancerService{},
fwd: &MockForwarder{},
rr: &MockRR{},
expectError: false,
},
{
desc: "Succeeds when stickiness is set",
serviceName: "test",
service: &config.LoadBalancerService{
Stickiness: &config.Stickiness{},
},
fwd: &MockForwarder{},
rr: &MockRR{},
expectError: false,
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
handler, err := sm.getLoadBalancer(context.Background(), test.serviceName, test.service, test.fwd, test.rr)
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) {
sm := NewManager(nil, http.DefaultTransport)
server1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "first")
}))
defer server1.Close()
server2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "second")
}))
defer server2.Close()
serverPassHost := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "passhost")
assert.Equal(t, "callme", r.Host)
}))
defer serverPassHost.Close()
serverPassHostFalse := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("X-From", "passhostfalse")
assert.NotEqual(t, "callme", r.Host)
}))
defer serverPassHostFalse.Close()
type ExpectedResult struct {
StatusCode int
XFrom string
}
testCases := []struct {
desc string
serviceName string
service *config.LoadBalancerService
responseModifier func(*http.Response) error
expected []ExpectedResult
}{
{
desc: "Load balances between the two servers",
serviceName: "test",
service: &config.LoadBalancerService{
Servers: []config.Server{
{
URL: server1.URL,
Weight: 50,
},
{
URL: server2.URL,
Weight: 50,
},
},
Method: "wrr",
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "first",
},
{
StatusCode: http.StatusOK,
XFrom: "second",
},
},
},
{
desc: "StatusBadGateway when the server is not reachable",
serviceName: "test",
service: &config.LoadBalancerService{
Servers: []config.Server{
{
URL: "http://foo",
Weight: 1,
},
},
Method: "wrr",
},
expected: []ExpectedResult{
{
StatusCode: http.StatusBadGateway,
},
},
},
{
desc: "ServiceUnavailable when no servers are available",
serviceName: "test",
service: &config.LoadBalancerService{
Servers: []config.Server{},
Method: "wrr",
},
expected: []ExpectedResult{
{
StatusCode: http.StatusServiceUnavailable,
},
},
},
{
desc: "Always call the same server when stickiness is true",
serviceName: "test",
service: &config.LoadBalancerService{
Stickiness: &config.Stickiness{},
Servers: []config.Server{
{
URL: server1.URL,
Weight: 1,
},
{
URL: server2.URL,
Weight: 1,
},
},
Method: "wrr",
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "first",
},
{
StatusCode: http.StatusOK,
XFrom: "first",
},
},
},
{
desc: "PassHost passes the host instead of the IP",
serviceName: "test",
service: &config.LoadBalancerService{
Stickiness: &config.Stickiness{},
PassHostHeader: true,
Servers: []config.Server{
{
URL: serverPassHost.URL,
Weight: 1,
},
},
Method: "wrr",
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "passhost",
},
},
},
{
desc: "PassHost doesn't passe the host instead of the IP",
serviceName: "test",
service: &config.LoadBalancerService{
Stickiness: &config.Stickiness{},
Servers: []config.Server{
{
URL: serverPassHostFalse.URL,
Weight: 1,
},
},
Method: "wrr",
},
expected: []ExpectedResult{
{
StatusCode: http.StatusOK,
XFrom: "passhostfalse",
},
},
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
handler, err := sm.getLoadBalancerServiceHandler(context.Background(), test.serviceName, test.service, test.responseModifier)
assert.NoError(t, err)
assert.NotNil(t, handler)
req := testhelpers.MustNewRequest(http.MethodGet, "http://callme", nil)
for _, expected := range test.expected {
recorder := httptest.NewRecorder()
handler.ServeHTTP(recorder, req)
assert.Equal(t, expected.StatusCode, recorder.Code)
assert.Equal(t, expected.XFrom, recorder.Header().Get("X-From"))
if len(recorder.Header().Get("Set-Cookie")) > 0 {
req.Header.Set("Cookie", recorder.Header().Get("Set-Cookie"))
}
}
})
}
}
// FIXME Add healthcheck tests