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forbiddenmethod: add (disabled) lint against
(*errgroup.Group).Go
a…
…nd `go` This helps move the needle on #58164 by introducing linters that force both the use of a `ctxgroup` over an `errgroup` and prevent direct use of the `go` keyword. They are disabled by default because we need to fix the issues they find first. This can be done (for development) in `forbiddenmethod.Analyzers`. They can then also be invoked in a targeted fashion: ``` go vet -vettool ./bin/roachvet -errgroupgo ./pkg/somewhere go vet -vettool ./bin/roachvet -nakedgo ./pkg/somewhere ``` Release note: None
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// Copyright 2019 The Cockroach Authors. | ||
// | ||
// Use of this software is governed by the Business Source License | ||
// included in the file licenses/BSL.txt. | ||
// | ||
// As of the Change Date specified in that file, in accordance with | ||
// the Business Source License, use of this software will be governed | ||
// by the Apache License, Version 2.0, included in the file | ||
// licenses/APL.txt. | ||
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package forbiddenmethod_test | ||
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import "github.com/cockroachdb/cockroach/pkg/build/bazel" | ||
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func init() { | ||
if bazel.BuiltWithBazel() { | ||
bazel.SetGoEnv() | ||
} | ||
} |
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// Copyright 2021 The Cockroach Authors. | ||
// | ||
// Use of this software is governed by the Business Source License | ||
// included in the file licenses/BSL.txt. | ||
// | ||
// As of the Change Date specified in that file, in accordance with | ||
// the Business Source License, use of this software will be governed | ||
// by the Apache License, Version 2.0, included in the file | ||
// licenses/APL.txt. | ||
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package forbiddenmethod | ||
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import ( | ||
"fmt" | ||
"go/ast" | ||
"strings" | ||
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"github.com/cockroachdb/cockroach/pkg/testutils/lint/passes/passesutil" | ||
"golang.org/x/tools/go/analysis" | ||
"golang.org/x/tools/go/analysis/passes/inspect" | ||
"golang.org/x/tools/go/ast/inspector" | ||
) | ||
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const nakedGoPassName = "nakedgo" | ||
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// NakedGoAnalyzer prevents use of the `go` keyword. | ||
var NakedGoAnalyzer = &analysis.Analyzer{ | ||
Name: nakedGoPassName, | ||
Doc: "Prevents direct use of the 'go' keyword. Goroutines should be launched through Stopper.", | ||
Requires: []*analysis.Analyzer{inspect.Analyzer}, | ||
Run: func(pass *analysis.Pass) (interface{}, error) { | ||
inspect := pass.ResultOf[inspect.Analyzer].(*inspector.Inspector) | ||
inspect.Preorder([]ast.Node{ | ||
(*ast.GoStmt)(nil), | ||
}, func(n ast.Node) { | ||
node := n.(*ast.GoStmt) | ||
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const debug = false | ||
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// NB: we're not using passesutil.HasNoLintComment because it | ||
// has false negatives (i.e. comments apply to infractions that | ||
// they were clearly not intended for). | ||
// | ||
// The approach here is inspired by `analysistest.check` - the | ||
// nolint comment has to be on the same line as the *end* of the | ||
// `*GoStmt`. | ||
f := passesutil.FindContainingFile(pass, n) | ||
cm := ast.NewCommentMap(pass.Fset, node, f.Comments) | ||
var cc *ast.Comment | ||
for _, cg := range cm[n] { | ||
for _, c := range cg.List { | ||
if c.Pos() < node.Go { | ||
// The current comment is "before" the `go` invocation, so it's | ||
// not relevant for silencing the lint. | ||
continue | ||
} | ||
if cc == nil || cc.Pos() > node.Go { | ||
// This comment is after, but closer to the `go` invocation than | ||
// previous candidate. | ||
cc = c | ||
if debug { | ||
fmt.Printf("closest comment now %d-%d: %s\n", cc.Pos(), cc.End(), cc.Text) | ||
} | ||
} | ||
} | ||
} | ||
if cc != nil && strings.Contains(cc.Text, "nolint:"+nakedGoPassName) { | ||
if debug { | ||
fmt.Printf("GoStmt at: %d-%d\n", n.Pos(), n.End()) | ||
fmt.Printf("GoStmt.Go at: %d\n", node.Go) | ||
fmt.Printf("GoStmt.Call at: %d-%d\n", node.Call.Pos(), node.Call.End()) | ||
} | ||
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goPos := pass.Fset.Position(node.End()) | ||
cmPos := pass.Fset.Position(cc.Pos()) | ||
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if goPos.Line == cmPos.Line { | ||
if debug { | ||
fmt.Printf("suppressing lint because of %d-%d: %s\n", cc.Pos(), cc.End(), cc.Text) | ||
} | ||
return | ||
} | ||
} | ||
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pass.Report(analysis.Diagnostic{ | ||
Pos: n.Pos(), | ||
Message: "Use of go keyword not allowed, use a Stopper instead", | ||
}) | ||
}) | ||
return nil, nil | ||
}, | ||
} |
25 changes: 25 additions & 0 deletions
25
pkg/testutils/lint/passes/forbiddenmethod/naked_go_test.go
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// Copyright 2019 The Cockroach Authors. | ||
// | ||
// Use of this software is governed by the Business Source License | ||
// included in the file licenses/BSL.txt. | ||
// | ||
// As of the Change Date specified in that file, in accordance with | ||
// the Business Source License, use of this software will be governed | ||
// by the Apache License, Version 2.0, included in the file | ||
// licenses/APL.txt. | ||
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package forbiddenmethod_test | ||
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import ( | ||
"testing" | ||
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"github.com/cockroachdb/cockroach/pkg/testutils" | ||
"github.com/cockroachdb/cockroach/pkg/testutils/lint/passes/forbiddenmethod" | ||
"golang.org/x/tools/go/analysis/analysistest" | ||
) | ||
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func TestNakedGo(t *testing.T) { | ||
testdata := testutils.TestDataPath(t) | ||
analysistest.TestData = func() string { return testdata } | ||
analysistest.Run(t, testdata, forbiddenmethod.NakedGoAnalyzer, "nakedgotest") | ||
} |
48 changes: 48 additions & 0 deletions
48
pkg/testutils/lint/passes/forbiddenmethod/testdata/src/nakedgotest/foo.go
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// Copyright 2021 The Cockroach Authors. | ||
// | ||
// Use of this software is governed by the Business Source License | ||
// included in the file licenses/BSL.txt. | ||
// | ||
// As of the Change Date specified in that file, in accordance with | ||
// the Business Source License, use of this software will be governed | ||
// by the Apache License, Version 2.0, included in the file | ||
// licenses/APL.txt. | ||
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package nakedgotest | ||
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func toot() { | ||
// The nolint comment below should have no effect. | ||
// For some reason though it shows up in the CommentMap | ||
// for the *ast.GoStmt, though. No idea why. | ||
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//nolint:nakedgo should not help anyone | ||
} | ||
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func A() { | ||
//nolint: I'm a noop | ||
go func() {}() // want `Use of go keyword not allowed, use a Stopper instead` | ||
go toot() // want `Use of go keyword not allowed, use a Stopper instead` | ||
go /* nolint: nakedgo not helping */ toot() // want `Use of go keyword not allowed, use a Stopper instead` | ||
/* nolint: nakedgo nope */ go toot() // want `Use of go keyword not allowed, use a Stopper instead` | ||
//nolint:nakedgo nope, this one neither | ||
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go func() {}() // want `Use of go keyword not allowed, use a Stopper instead` | ||
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go func() {}() //nolint:nakedgo | ||
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go toot() //nolint:nakedgo | ||
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go func() { /* want `Use of go keyword not allowed, use a Stopper instead` */ //nolint:nakedgo | ||
_ = 0 | ||
}() | ||
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go func() { // want `Use of go keyword not allowed, use a Stopper instead` | ||
_ = 0 //nolint:nakedgo | ||
}() | ||
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// Finally, doing it right! | ||
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go func() { | ||
_ = 0 | ||
}() //nolint:nakedgo | ||
} |