rename ngin to rest

rest/handler/maxconnshandler_test.go

@@ -0,0 +1,80 @@
+package handler
+
+import (
+	"io/ioutil"
+	"log"
+	"net/http"
+	"net/http/httptest"
+	"sync"
+	"testing"
+
+	"zero/core/lang"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const conns = 4
+
+func init() {
+	log.SetOutput(ioutil.Discard)
+}
+
+func TestMaxConnsHandler(t *testing.T) {
+	var waitGroup sync.WaitGroup
+	waitGroup.Add(conns)
+	done := make(chan lang.PlaceholderType)
+	defer close(done)
+
+	maxConns := MaxConns(conns)
+	handler := maxConns(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		waitGroup.Done()
+		<-done
+	}))
+
+	for i := 0; i < conns; i++ {
+		go func() {
+			req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+			handler.ServeHTTP(httptest.NewRecorder(), req)
+		}()
+	}
+
+	waitGroup.Wait()
+	req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+	resp := httptest.NewRecorder()
+	handler.ServeHTTP(resp, req)
+	assert.Equal(t, http.StatusServiceUnavailable, resp.Code)
+}
+
+func TestWithoutMaxConnsHandler(t *testing.T) {
+	const (
+		key   = "block"
+		value = "1"
+	)
+	var waitGroup sync.WaitGroup
+	waitGroup.Add(conns)
+	done := make(chan lang.PlaceholderType)
+	defer close(done)
+
+	maxConns := MaxConns(0)
+	handler := maxConns(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		val := r.Header.Get(key)
+		if val == value {
+			waitGroup.Done()
+			<-done
+		}
+	}))
+
+	for i := 0; i < conns; i++ {
+		go func() {
+			req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+			req.Header.Set(key, value)
+			handler.ServeHTTP(httptest.NewRecorder(), req)
+		}()
+	}
+
+	waitGroup.Wait()
+	req := httptest.NewRequest(http.MethodGet, "http://localhost", nil)
+	resp := httptest.NewRecorder()
+	handler.ServeHTTP(resp, req)
+	assert.Equal(t, http.StatusOK, resp.Code)
+}