github.com/cloudwego/kitex@v0.9.0/pkg/limiter/connection_limiter_test.go (about)

     1  /*
     2   * Copyright 2021 CloudWeGo Authors
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package limiter
    18  
    19  import (
    20  	"context"
    21  	"sync"
    22  	"sync/atomic"
    23  	"testing"
    24  	"time"
    25  
    26  	"github.com/cloudwego/kitex/internal/test"
    27  )
    28  
    29  func TestConnectionLimiter(t *testing.T) {
    30  	connLimit := 50
    31  	ctx := context.Background()
    32  	lim := NewConnectionLimiter(connLimit)
    33  
    34  	var wg sync.WaitGroup
    35  	var connCount int32
    36  	for i := 0; i < 100; i++ {
    37  		wg.Add(1)
    38  		go func() {
    39  			defer wg.Done()
    40  			for j := 0; j < 10; j++ {
    41  				if lim.Acquire(ctx) {
    42  					atomic.AddInt32(&connCount, 1)
    43  					time.Sleep(time.Millisecond)
    44  				} else {
    45  					lim.Release(ctx)
    46  					time.Sleep(time.Millisecond)
    47  				}
    48  				_, curr := lim.Status(ctx)
    49  				test.Assert(t, curr <= 60, curr)
    50  			}
    51  		}()
    52  	}
    53  	wg.Wait()
    54  	test.Assert(t, int(connCount) == connLimit)
    55  
    56  	// still limited
    57  	var newConnCount int32
    58  	for j := 0; j < 10; j++ {
    59  		if lim.Acquire(ctx) {
    60  			atomic.AddInt32(&newConnCount, 1)
    61  		} else {
    62  			lim.Release(ctx)
    63  		}
    64  	}
    65  	test.Assert(t, newConnCount == 0)
    66  
    67  	// release then new connection can be used
    68  	for j := 0; j < 10; j++ {
    69  		lim.Release(ctx)
    70  		if lim.Acquire(ctx) {
    71  			atomic.AddInt32(&newConnCount, 1)
    72  		} else {
    73  			lim.Release(ctx)
    74  		}
    75  	}
    76  	test.Assert(t, newConnCount == 10)
    77  
    78  	lim.(Updatable).UpdateLimit(0)
    79  	var failedConnCount int32
    80  
    81  	for i := 0; i < 100; i++ {
    82  		wg.Add(1)
    83  		go func() {
    84  			defer wg.Done()
    85  			for j := 0; j < 10; j++ {
    86  				if !lim.Acquire(ctx) {
    87  					atomic.AddInt32(&failedConnCount, 1)
    88  				}
    89  			}
    90  		}()
    91  	}
    92  	wg.Wait()
    93  	test.Assert(t, failedConnCount == 0)
    94  }