Fix goroutine leak: make flushDaemon stoppable #293
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| package main | ||
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| import ( | ||
| "flag" | ||
| "testing" | ||
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| "go.uber.org/goleak" | ||
| "k8s.io/klog/v2" | ||
| ) | ||
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| func main() { | ||
| klog.InitFlags(nil) | ||
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| // By default klog writes to stderr. Setting logtostderr to false makes klog | ||
| // write to a log file. | ||
| flag.Set("logtostderr", "false") | ||
| flag.Set("log_file", "myfile.log") | ||
| flag.Parse() | ||
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| // Info writes the first log message. When the first log file is created, | ||
| // a flushDaemon is started to frequently flush bytes to the file. | ||
| klog.Info("nice to meet you") | ||
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| // klog won't ever stop this flushDaemon. To exit without leaking a goroutine, | ||
| // the daemon can be stopped manually. | ||
| klog.StopFlushDaemon() | ||
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| // After you stopped the flushDaemon, you can still manually flush. | ||
| klog.Info("bye") | ||
| klog.Flush() | ||
| } | ||
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| func TestLeakingFlushDaemon(t *testing.T) { | ||
| // goleak detects leaking goroutines. | ||
| defer goleak.VerifyNone(t) | ||
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| // Without calling StopFlushDaemon in main, this test will fail. | ||
| main() | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -2,4 +2,7 @@ module k8s.io/klog/v2 | |
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| go 1.13 | ||
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| require ( | ||
| github.com/go-logr/logr v1.2.0 | ||
| k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 | ||
|
There was a problem hiding this comment. this adds a circular dependency... utils already depends on klog, we should avoid making klog also depend on utils There was a problem hiding this comment. I think the test is useful enough that we should not remove it and instead carry a copy of the clock code -> #310 |
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| ) | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,13 @@ | ||
| github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= | ||
| github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= | ||
| github.com/go-logr/logr v0.1.0/go.mod h1:ixOQHD9gLJUVQQ2ZOR7zLEifBX6tGkNJF4QyIY7sIas= | ||
| github.com/go-logr/logr v1.2.0 h1:QK40JKJyMdUDz+h+xvCsru/bJhvG0UxvePV0ufL/AcE= | ||
| github.com/go-logr/logr v1.2.0/go.mod h1:jdQByPbusPIv2/zmleS9BjJVeZ6kBagPoEUsqbVz/1A= | ||
| github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= | ||
| github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk= | ||
| github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= | ||
| github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= | ||
| golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= | ||
| k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE= | ||
| k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9 h1:HNSDgDCrr/6Ly3WEGKZftiE7IY19Vz2GdbOCyI4qqhc= | ||
| k8s.io/utils v0.0.0-20220210201930-3a6ce19ff2f9/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA= |
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