minio/cmd/rate-limit-handler_test.go

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/*
* Minio Cloud Storage, (C) 2016 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cmd
import (
"fmt"
"net/http"
"net/http/httptest"
"testing"
"time"
)
// This test sets globalMaxConn to 1 and starts 6 connections in
// parallel on a server with the rate limit handler configured. This
// should allow one request to execute at a time, and at most 4 to
// wait to execute and the 6th request should get a 429 status code
// error.
func TestRateLimitHandler(t *testing.T) {
// save the global Max connections
saveGlobalMaxConn := globalMaxConn
globalMaxConn = 1
testHandler := func(w http.ResponseWriter, r *http.Request) {
time.Sleep(100 * time.Millisecond)
fmt.Fprintln(w, "Hello client!")
}
rlh := setRateLimitHandler(http.HandlerFunc(testHandler))
ts := httptest.NewServer(rlh)
respCh := make(chan int)
startTime := time.Now()
for i := 0; i < 6; i++ {
go func(ch chan<- int) {
resp, err := http.Get(ts.URL)
if err != nil {
t.Errorf(
"Got error requesting test server - %v\n",
err,
)
}
respCh <- resp.StatusCode
}(respCh)
}
tooManyReqErrCount := 0
for i := 0; i < 6; i++ {
code := <-respCh
if code == 429 {
tooManyReqErrCount++
} else if code != 200 {
t.Errorf("Got non-200 resp code - %d\n", code)
}
}
duration := time.Since(startTime)
if duration < time.Duration(500*time.Millisecond) {
// as globalMaxConn is 1, only 1 request will execute
// at a time, and the five allowed requested will take
// at least 500 ms.
t.Errorf("Expected all requests to take at least 500ms, but it was done in %v\n",
duration)
}
if tooManyReqErrCount != 1 {
t.Errorf("Expected to get 1 error, but got %d",
tooManyReqErrCount)
}
ts.Close()
// restore the global Max connections
globalMaxConn = saveGlobalMaxConn
}