-
Notifications
You must be signed in to change notification settings - Fork 132
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
- Loading branch information
1 parent
69ec07e
commit bcb22f8
Showing
3 changed files
with
153 additions
and
13 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| // Copyright (c) 2017-2021 Uber Technologies Inc. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| // of this software and associated documentation files (the "Software"), to deal | ||
| // in the Software without restriction, including without limitation the rights | ||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| // copies of the Software, and to permit persons to whom the Software is | ||
| // furnished to do so, subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in | ||
| // all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| // THE SOFTWARE. | ||
|
|
||
| package worker | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "math/rand" | ||
|
|
||
| "github.com/stretchr/testify/assert" | ||
| "go.uber.org/atomic" | ||
| ) | ||
|
|
||
| func TestPermit_Simulation(t *testing.T) { | ||
| tests := []struct{ | ||
| name string | ||
| capacity []int // update every 50ms | ||
| goroutines int // each would block on acquiring 2-6 tokens for 100ms | ||
| goroutinesAcquireChan int // each would block using AcquireChan for 100ms | ||
| maxTestDuration time.Duration | ||
| expectFailures int | ||
| expectFailuresAtLeast int | ||
| } { | ||
| { | ||
| name: "enough permit, no blocking", | ||
| maxTestDuration: 200*time.Millisecond, | ||
| capacity: []int{1000}, | ||
| goroutines: 100, | ||
| goroutinesAcquireChan: 100, | ||
| expectFailures: 0, | ||
| }, | ||
| { | ||
| name: "not enough permit, blocking but all acquire", | ||
| maxTestDuration: 1*time.Second, | ||
| capacity: []int{200}, | ||
| goroutines: 500, | ||
| goroutinesAcquireChan: 500, | ||
| expectFailures: 0, | ||
| }, | ||
| { | ||
| name: "not enough permit for some to acquire, fail some", | ||
| maxTestDuration: 100*time.Millisecond, | ||
| capacity: []int{100}, | ||
| goroutines: 500, | ||
| goroutinesAcquireChan: 500, | ||
| expectFailuresAtLeast: 1, | ||
| }, | ||
| { | ||
| name: "not enough permit at beginning but due to capacity change, blocking but all acquire", | ||
| maxTestDuration: 100*time.Second, | ||
| capacity: []int{100, 200, 300}, | ||
| goroutines: 500, | ||
| goroutinesAcquireChan: 500, | ||
| expectFailures: 0, | ||
| }, | ||
| { | ||
| name: "not enough permit for any acquire, fail all", | ||
| maxTestDuration: 1*time.Second, | ||
| capacity: []int{0}, | ||
| goroutines: 1000, | ||
| expectFailures: 1000, | ||
| }, | ||
| } | ||
|
|
||
| for _, tt := range tests { | ||
| t.Run(tt.name, func(t *testing.T) { | ||
| wg := &sync.WaitGroup{} | ||
| permit := NewPermit(tt.capacity[0]) | ||
| wg.Add(1) | ||
| go func() { // update quota every 50ms | ||
| defer wg.Done() | ||
| for i := 1; i < len(tt.capacity); i++ { | ||
| time.Sleep(50*time.Millisecond) | ||
| permit.SetQuota(tt.capacity[i]) | ||
| } | ||
| }() | ||
| failures := atomic.NewInt32(0) | ||
| ctx, cancel := context.WithTimeout(context.Background(), tt.maxTestDuration) | ||
| defer cancel() | ||
| for i := 0; i < tt.goroutines; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| num := rand.Intn(2)+2 | ||
| // num := 1 | ||
| if err := permit.Acquire(ctx, num); err != nil { | ||
| failures.Add(1) | ||
| return | ||
| } | ||
| time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond) | ||
| permit.Release(num) | ||
| }() | ||
| } | ||
| for i := 0; i < tt.goroutinesAcquireChan; i++ { | ||
| wg.Add(1) | ||
| go func() { | ||
| defer wg.Done() | ||
| select { | ||
| case <-permit.AcquireChan(ctx, wg): | ||
| time.Sleep(time.Duration(rand.Intn(100)) * time.Millisecond) | ||
| permit.Release(1) | ||
| case <-ctx.Done(): | ||
| failures.Add(1) | ||
| } | ||
| }() | ||
| } | ||
|
|
||
| wg.Wait() | ||
| assert.Equal(t, 0, permit.Count()) | ||
| if tt.expectFailuresAtLeast >0 { | ||
| assert.LessOrEqual(t, tt.expectFailuresAtLeast, int(failures.Load())) | ||
| } else { | ||
| assert.Equal(t, tt.expectFailures, int(failures.Load())) | ||
| } | ||
| assert.Equal(t, tt.capacity[len(tt.capacity)-1], permit.Quota()) | ||
| }) | ||
| } | ||
| } |