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v2: add test case for Manager.EventChan() behavior
This test case demonstrates that now the oom monitor goroutine terminates when a cgroup is removed. Systemd is responsible for cgroup removal so a "cat" process is spawned in a scope, with stdin attached to a pipe. When the pipe is closed the process terminates, systemd notices and removes the cgroup, which results in the test case finishing. Signed-off-by: Jeremi Piotrowski <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| /* | ||
| Copyright The containerd Authors. | ||
| 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 v2 | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "os/exec" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "go.uber.org/goleak" | ||
| ) | ||
|
|
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| func TestEventChanCleanupOnCgroupRemoval(t *testing.T) { | ||
| checkCgroupMode(t) | ||
|
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| cmd := exec.Command("cat") | ||
| stdin, err := cmd.StdinPipe() | ||
| if err != nil { | ||
| t.Fatalf("Failed to create cat process: %v", err) | ||
| } | ||
| if err := cmd.Start(); err != nil { | ||
| t.Fatalf("Failed to start cat process: %v", err) | ||
| } | ||
| proc := cmd.Process | ||
| if proc == nil { | ||
| t.Fatal("Process is nil") | ||
| } | ||
|
|
||
| group := fmt.Sprintf("testing-watcher-%d.scope", proc.Pid) | ||
| c, err := NewSystemd("", group, proc.Pid, &Resources{}) | ||
| if err != nil { | ||
| t.Fatalf("Failed to init new cgroup manager: %v", err) | ||
| } | ||
|
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| evCh, errCh := c.EventChan() | ||
|
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| // give event goroutine a chance to start | ||
| time.Sleep(500 * time.Millisecond) | ||
|
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| if err := stdin.Close(); err != nil { | ||
| t.Fatalf("Failed closing stdin: %v", err) | ||
| } | ||
| if err := cmd.Wait(); err != nil { | ||
| t.Fatalf("Failed waiting for cmd: %v", err) | ||
| } | ||
|
|
||
| done := false | ||
| for !done { | ||
| select { | ||
| case <-evCh: | ||
| case err := <-errCh: | ||
| if err != nil { | ||
| t.Fatalf("Unexpected error on error channel: %v", err) | ||
| } | ||
| done = true | ||
| case <-time.After(5 * time.Second): | ||
| t.Fatal("Timed out") | ||
| } | ||
| } | ||
| goleak.VerifyNone(t) | ||
| } |