142 lines
4.4 KiB
Go
142 lines
4.4 KiB
Go
package wrr
|
|
|
|
import (
|
|
"net/http"
|
|
"net/http/httptest"
|
|
"testing"
|
|
|
|
"github.com/stretchr/testify/assert"
|
|
"github.com/traefik/traefik/v2/pkg/config/dynamic"
|
|
)
|
|
|
|
func Int(v int) *int { return &v }
|
|
|
|
type responseRecorder struct {
|
|
*httptest.ResponseRecorder
|
|
save map[string]int
|
|
sequence []string
|
|
}
|
|
|
|
func (r *responseRecorder) WriteHeader(statusCode int) {
|
|
r.save[r.Header().Get("server")]++
|
|
r.sequence = append(r.sequence, r.Header().Get("server"))
|
|
r.ResponseRecorder.WriteHeader(statusCode)
|
|
}
|
|
|
|
func TestBalancer(t *testing.T) {
|
|
balancer := New(nil)
|
|
|
|
balancer.AddService("first", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "first")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(3))
|
|
|
|
balancer.AddService("second", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "second")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(1))
|
|
|
|
recorder := &responseRecorder{ResponseRecorder: httptest.NewRecorder(), save: map[string]int{}}
|
|
for i := 0; i < 4; i++ {
|
|
balancer.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/", nil))
|
|
}
|
|
|
|
assert.Equal(t, 3, recorder.save["first"])
|
|
assert.Equal(t, 1, recorder.save["second"])
|
|
}
|
|
|
|
func TestBalancerNoService(t *testing.T) {
|
|
balancer := New(nil)
|
|
|
|
recorder := httptest.NewRecorder()
|
|
balancer.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/", nil))
|
|
|
|
assert.Equal(t, http.StatusInternalServerError, recorder.Result().StatusCode)
|
|
}
|
|
|
|
func TestBalancerOneServerZeroWeight(t *testing.T) {
|
|
balancer := New(nil)
|
|
|
|
balancer.AddService("first", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "first")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(1))
|
|
|
|
balancer.AddService("second", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {}), Int(0))
|
|
|
|
recorder := &responseRecorder{ResponseRecorder: httptest.NewRecorder(), save: map[string]int{}}
|
|
for i := 0; i < 3; i++ {
|
|
balancer.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/", nil))
|
|
}
|
|
|
|
assert.Equal(t, 3, recorder.save["first"])
|
|
}
|
|
|
|
func TestBalancerAllServersZeroWeight(t *testing.T) {
|
|
balancer := New(nil)
|
|
|
|
balancer.AddService("test", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {}), Int(0))
|
|
balancer.AddService("test2", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {}), Int(0))
|
|
|
|
recorder := httptest.NewRecorder()
|
|
balancer.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/", nil))
|
|
|
|
assert.Equal(t, http.StatusInternalServerError, recorder.Result().StatusCode)
|
|
}
|
|
|
|
func TestSticky(t *testing.T) {
|
|
balancer := New(&dynamic.Sticky{
|
|
Cookie: &dynamic.Cookie{Name: "test"},
|
|
})
|
|
|
|
balancer.AddService("first", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "first")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(1))
|
|
|
|
balancer.AddService("second", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "second")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(2))
|
|
|
|
recorder := &responseRecorder{ResponseRecorder: httptest.NewRecorder(), save: map[string]int{}}
|
|
|
|
req := httptest.NewRequest(http.MethodGet, "/", nil)
|
|
for i := 0; i < 3; i++ {
|
|
for _, cookie := range recorder.Result().Cookies() {
|
|
req.AddCookie(cookie)
|
|
}
|
|
recorder.ResponseRecorder = httptest.NewRecorder()
|
|
|
|
balancer.ServeHTTP(recorder, req)
|
|
}
|
|
|
|
assert.Equal(t, 0, recorder.save["first"])
|
|
assert.Equal(t, 3, recorder.save["second"])
|
|
}
|
|
|
|
// TestBalancerBias makes sure that the WRR algorithm spreads elements evenly right from the start,
|
|
// and that it does not "over-favor" the high-weighted ones with a biased start-up regime.
|
|
func TestBalancerBias(t *testing.T) {
|
|
balancer := New(nil)
|
|
|
|
balancer.AddService("first", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "A")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(11))
|
|
|
|
balancer.AddService("second", http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
|
|
rw.Header().Set("server", "B")
|
|
rw.WriteHeader(http.StatusOK)
|
|
}), Int(3))
|
|
|
|
recorder := &responseRecorder{ResponseRecorder: httptest.NewRecorder(), save: map[string]int{}}
|
|
|
|
for i := 0; i < 14; i++ {
|
|
balancer.ServeHTTP(recorder, httptest.NewRequest(http.MethodGet, "/", nil))
|
|
}
|
|
|
|
wantSequence := []string{"A", "A", "A", "B", "A", "A", "A", "A", "B", "A", "A", "A", "B", "A"}
|
|
|
|
assert.Equal(t, wantSequence, recorder.sequence)
|
|
}
|