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package throttled_test
import (
"errors"
"net/http"
"net/http/httptest"
"testing"
"time"
"gopkg.in/throttled/throttled.v2"
)
type stubLimiter struct {
}
func (sl *stubLimiter) RateLimit(key string, quantity int) (bool, throttled.RateLimitResult, error) {
switch key {
case "limit":
return true, throttled.RateLimitResult{-1, -1, -1, time.Minute}, nil
case "error":
return false, throttled.RateLimitResult{}, errors.New("stubLimiter error")
default:
return false, throttled.RateLimitResult{1, 2, time.Minute, -1}, nil
}
}
type pathGetter struct{}
func (*pathGetter) Key(r *http.Request) string {
return r.URL.Path
}
type httpTestCase struct {
path string
code int
headers map[string]string
}
func TestHTTPRateLimiter(t *testing.T) {
limiter := throttled.HTTPRateLimiter{
RateLimiter: &stubLimiter{},
VaryBy: &pathGetter{},
}
handler := limiter.RateLimit(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
}))
runHTTPTestCases(t, handler, []httpTestCase{
{"ok", 200, map[string]string{"X-Ratelimit-Limit": "1", "X-Ratelimit-Remaining": "2", "X-Ratelimit-Reset": "60"}},
{"error", 500, map[string]string{}},
{"limit", 429, map[string]string{"Retry-After": "60"}},
})
}
func TestCustomHTTPRateLimiterHandlers(t *testing.T) {
limiter := throttled.HTTPRateLimiter{
RateLimiter: &stubLimiter{},
VaryBy: &pathGetter{},
DeniedHandler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
http.Error(w, "custom limit exceeded", 400)
}),
Error: func(w http.ResponseWriter, r *http.Request, err error) {
http.Error(w, "custom internal error", 501)
},
}
handler := limiter.RateLimit(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(200)
}))
runHTTPTestCases(t, handler, []httpTestCase{
{"limit", 400, map[string]string{}},
{"error", 501, map[string]string{}},
})
}
func runHTTPTestCases(t *testing.T, h http.Handler, cs []httpTestCase) {
for i, c := range cs {
req, err := http.NewRequest("GET", c.path, nil)
if err != nil {
t.Fatal(err)
}
rr := httptest.NewRecorder()
h.ServeHTTP(rr, req)
if have, want := rr.Code, c.code; have != want {
t.Errorf("Expected request %d at %s to return %d but got %d",
i, c.path, want, have)
}
for name, want := range c.headers {
if have := rr.HeaderMap.Get(name); have != want {
t.Errorf("Expected request %d at %s to have header '%s: %s' but got '%s'",
i, c.path, name, want, have)
}
}
}
}
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