Adds mirroring service

pkg/server/service/loadbalancer/mirror/mirror_test.go

@@ -0,0 +1,79 @@
+package mirror
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"sync/atomic"
+	"testing"
+
+	"github.com/containous/traefik/v2/pkg/safe"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestMirroringOn100(t *testing.T) {
+	var countMirror1, countMirror2 int32
+	handler := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		rw.WriteHeader(http.StatusOK)
+	})
+	pool := safe.NewPool(context.Background())
+	mirror := New(handler, pool)
+	err := mirror.AddMirror(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		atomic.AddInt32(&countMirror1, 1)
+	}), 10)
+	assert.NoError(t, err)
+
+	err = mirror.AddMirror(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		atomic.AddInt32(&countMirror2, 1)
+	}), 50)
+	assert.NoError(t, err)
+
+	for i := 0; i < 100; i++ {
+		mirror.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
+	}
+
+	pool.Stop()
+
+	val1 := atomic.LoadInt32(&countMirror1)
+	val2 := atomic.LoadInt32(&countMirror2)
+	assert.Equal(t, 10, int(val1))
+	assert.Equal(t, 50, int(val2))
+}
+
+func TestMirroringOn10(t *testing.T) {
+	var countMirror1, countMirror2 int32
+	handler := http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		rw.WriteHeader(http.StatusOK)
+	})
+	pool := safe.NewPool(context.Background())
+	mirror := New(handler, pool)
+	err := mirror.AddMirror(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		atomic.AddInt32(&countMirror1, 1)
+	}), 10)
+	assert.NoError(t, err)
+
+	err = mirror.AddMirror(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		atomic.AddInt32(&countMirror2, 1)
+	}), 50)
+	assert.NoError(t, err)
+
+	for i := 0; i < 10; i++ {
+		mirror.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "/", nil))
+	}
+
+	pool.Stop()
+
+	val1 := atomic.LoadInt32(&countMirror1)
+	val2 := atomic.LoadInt32(&countMirror2)
+	assert.Equal(t, 1, int(val1))
+	assert.Equal(t, 5, int(val2))
+}
+
+func TestInvalidPercent(t *testing.T) {
+	mirror := New(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {}), safe.NewPool(context.Background()))
+	err := mirror.AddMirror(nil, -1)
+	assert.Error(t, err)
+
+	err = mirror.AddMirror(nil, 101)
+	assert.Error(t, err)
+}