add klog.v(0) and logger.v(0) check #4

yangjunmyfm192085 · 2022-08-27T16:41:48Z

as mentioned in #2
Calling V with zero as parameter just causes additional overhead.
we want a way to enforce that this code pattern doesn't get added back in some future PR

yangjunmyfm192085 · 2022-08-27T16:44:19Z

/cc @pohly

pohly

This already looks pretty good. Some comments...

logcheck/pkg/logcheck.go

yangjunmyfm192085 · 2022-08-30T03:16:27Z

@pohly Thank you for the very detailed review, some scenarios were not considered at first, and now it has been updated.
could you please take a look again? thanks

pohly · 2022-08-30T06:12:20Z

logcheck/pkg/logcheck.go

+					Pos:     fexpr.Fun.Pos(),
+					Message: msg,
+				})
+			}


Can you move the pass.Report down into checkForVerboseZero to avoid the code duplication? If we ever decide to make it better (for example, by suggesting a code update), then we only need to make that change in one place.

checkForVerboseZero can call a isVerboseZero that is equivalent to the current function.

Yeah, this part is duplicated.
I have optimized it.

pohly · 2022-08-30T07:50:21Z

logcheck/pkg/logcheck.go

@@ -36,6 +36,7 @@ const (
 	parametersCheck  = "parameters"
 	contextualCheck  = "contextual"
 	withHelpersCheck = "with-helpers"
+	verboseZeroCheck = "verbose-zero"


One last thing: should this be "verbosity" instead of "verbose"?

I think V stands for "verbosity" of the log message, but I might be wrong (not a native speaker).

A log message is "verbose", but it has "verbosity zero".

yangjunmyfm192085 · 2022-08-30T08:38:42Z

@pohly I think you are right.
I checked the explanation of V in the code.

  V reports whether verbosity at the call site is at least the requested level.

So V should be verbosity here, I have updated. thanks.

pohly

/lgtm
/approve

Thanks a lot!

k8s-ci-robot · 2022-08-30T11:19:26Z

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pohly · 2022-08-30T11:34:42Z

logcheck/pkg/logcheck.go

+		return true
+	}
+
+	if id, ok := subCallExpr.Args[0].(*ast.Ident); ok && id.Obj.Kind == 2 {


I'm not sure what is nil, but when I tried this change on top of your kubernetes/kubernetes#111708 I got a nil pointer access:

ERRO [runner] Panic: logcheck: package "vclib" (isInitialPkg: true, needAnalyzeSource: true): runtime error: invalid memory address or nil pointer dereference: goroutine 18650 [running]: runtime/debug.Stack() /nvme/gopath/go-1.19/src/runtime/debug/stack.go:24 +0x65 github.com/golangci/golangci-lint/pkg/golinters/goanalysis.(*action).analyzeSafe.func1() /nvme/gopath/pkg/mod/github.com/golangci/golangci-lint@v1.48.0/pkg/golinters/goanalysis/runner_action.go:101 +0x155 panic({0x153a9e0, 0x2024fd0}) /nvme/gopath/go-1.19/src/runtime/panic.go:884 +0x212 sigs.k8s.io/logtools/logcheck/pkg.isVerbosityZero({0x18ff6c0?, 0xc01b9c4000?}) /nvme/gopath/pkg/mod/sigs.k8s.io/logtools@v0.2.1-0.20220830112100-f68289b649a5/logcheck/pkg/logcheck.go:544 +0xb5

To reproduce, check out your Kubernetes branch and patch it:

diff --git a/hack/tools/go.mod b/hack/tools/go.mod index 8728f260aa4..ffcc1ab1519 100644 --- a/hack/tools/go.mod +++ b/hack/tools/go.mod @@ -11,7 +11,7 @@ require ( github.com/google/go-flow-levee v0.1.5 gotest.tools/gotestsum v1.6.4 honnef.co/go/tools v0.3.3 - sigs.k8s.io/logtools v0.1.0 + sigs.k8s.io/logtools v0.2.1-0.20220830112100-f68289b649a5 sigs.k8s.io/zeitgeist v0.2.0 ) diff --git a/hack/tools/go.sum b/hack/tools/go.sum index 0dc6f65d798..c39cafc35cd 100644 --- a/hack/tools/go.sum +++ b/hack/tools/go.sum @@ -829,6 +829,7 @@ github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9de github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= github.com/yuin/goldmark v1.4.1/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= +github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY= gitlab.com/bosi/decorder v0.2.3 h1:gX4/RgK16ijY8V+BRQHAySfQAb354T7/xQpDB2n10P0= gitlab.com/bosi/decorder v0.2.3/go.mod h1:9K1RB5+VPNQYtXtTDAzd2OEftsZb1oV0IrJrzChSdGE= go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU= @@ -1077,6 +1078,7 @@ golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBc golang.org/x/sys v0.0.0-20220319134239-a9b59b0215f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220328115105-d36c6a25d886/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220412211240-33da011f77ad/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= +golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220702020025-31831981b65f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg= golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s= @@ -1368,6 +1370,10 @@ rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0= rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA= sigs.k8s.io/logtools v0.1.0 h1:BWdoZu2PK6/lj5QhSXBGlHFu3d/ST1HlINXwE/CkJRQ= sigs.k8s.io/logtools v0.1.0/go.mod h1:/Rp/yzQWyUgsNCRb1HKRnrVujUV9CmzksOlsQR2OVvw= +sigs.k8s.io/logtools v0.2.0 h1:FMy0Td6HnWP+Iqq9QWEZigS130aZSMtlhRn5pcZbwCo= +sigs.k8s.io/logtools v0.2.0/go.mod h1:2HGcCK1vi9YvsBoUDMXvrf588j890iRtsymJX2biE0Q= +sigs.k8s.io/logtools v0.2.1-0.20220830112100-f68289b649a5 h1:dy8gOoe/fHFqY1vN16XTgl/S8TIpuyxkE0wCTUr1UV4= +sigs.k8s.io/logtools v0.2.1-0.20220830112100-f68289b649a5/go.mod h1:2HGcCK1vi9YvsBoUDMXvrf588j890iRtsymJX2biE0Q= sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o= sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q= sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

Then run hack/verify-golangci-lint.sh. That also shows that there are several more code lines which need to be modified.

If you want to try out a modified logcheck then you can point towards a local copy with:

(cd hack/tools && go mod edit -replace sigs.k8s.io/logtools=<absolute path>/logtools/)

No code survives first contact with the real world 😁

Let me analyze why

Hi, @pohly , This is an interesting issue, but I don't reproduce it.
I don't know what scenario will appear that obj is nil.
In the pr below I have added protection, do we need to continue the analysis or could we merge this pr?
#5

It's indeed a bit odd. I can only reproduce it by running hack/verify-golangci-lint.sh, but not when invoking logcheck directly.

And now I cannot reproduce it anymore. Perhaps it was a problem with the golangci-lint cache.

Hi, @pohly ,I think I caught the issue.
When Constants of value is defined in different files, there will be cases where it cannot be parsed directly
such as
https://github.com/kubernetes/kubernetes/blob/2b2be7fa6b69c7591a31475fc4fb1dcff362a128/staging/src/k8s.io/legacy-cloud-providers/vsphere/vclib/datastore.go#L62

https://github.com/kubernetes/kubernetes/blob/2b2be7fa6b69c7591a31475fc4fb1dcff362a128/staging/src/k8s.io/legacy-cloud-providers/vsphere/vclib/constants.go#L43

Do we need to continue dealing with this scenario, is it a bit complicated?
Or do we just need to fix panic?

I think it is sufficient to avoid the panic. Please reopen #5 and add an explanation in the code why the additional if conditions are needed, then I can merge it.

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yangjunmyfm192085 mentioned this pull request Aug 28, 2022

use klog.InfoS instead of klog.V(0).InfoS kubernetes/kubernetes#111708

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add klog.v(0) and logger.v(0) check

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fix VerbosityZero check panic #5

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add klog.v(0) and logger.v(0) check #4

add klog.v(0) and logger.v(0) check #4

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add klog.v(0) and logger.v(0) check #4

add klog.v(0) and logger.v(0) check #4

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