github.com/KinWaiYuen/client-go/v2@v2.5.4/util/rate_limit_test.go (about)

     1  // Copyright 2021 TiKV Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // NOTE: The code in this file is based on code from the
    16  // TiDB project, licensed under the Apache License v 2.0
    17  //
    18  // https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/util/rate_limit_test.go
    19  //
    20  
    21  // Copyright 2021 PingCAP, Inc.
    22  //
    23  // Licensed under the Apache License, Version 2.0 (the "License");
    24  // you may not use this file except in compliance with the License.
    25  // You may obtain a copy of the License at
    26  //
    27  //     http://www.apache.org/licenses/LICENSE-2.0
    28  //
    29  // Unless required by applicable law or agreed to in writing, software
    30  // distributed under the License is distributed on an "AS IS" BASIS,
    31  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    32  // See the License for the specific language governing permissions and
    33  // limitations under the License.
    34  
    35  package util
    36  
    37  import (
    38  	"testing"
    39  	"time"
    40  
    41  	"github.com/stretchr/testify/assert"
    42  )
    43  
    44  func TestRateLimit(t *testing.T) {
    45  	assert := assert.New(t)
    46  
    47  	done := make(chan struct{}, 1)
    48  	rl := NewRateLimit(1)
    49  	assert.PanicsWithValue("put a redundant token", rl.PutToken)
    50  	exit := rl.GetToken(done)
    51  	assert.False(exit)
    52  	rl.PutToken()
    53  	assert.PanicsWithValue("put a redundant token", rl.PutToken)
    54  
    55  	exit = rl.GetToken(done)
    56  	assert.False(exit)
    57  	done <- struct{}{}
    58  	exit = rl.GetToken(done) // blocked but exit
    59  	assert.True(exit)
    60  
    61  	sig := make(chan int, 1)
    62  	go func() {
    63  		exit = rl.GetToken(done) // blocked
    64  		assert.False(exit)
    65  		close(sig)
    66  	}()
    67  	time.Sleep(200 * time.Millisecond)
    68  	rl.PutToken()
    69  	<-sig
    70  }