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package rule
import (
"go/ast"
"github.com/mgechev/revive/lint"
)
// WaitGroupByValueRule lints sync.WaitGroup passed by copy in functions.
type WaitGroupByValueRule struct{}
// Apply applies the rule to given file.
func (r *WaitGroupByValueRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
onFailure := func(failure lint.Failure) {
failures = append(failures, failure)
}
w := lintWaitGroupByValueRule{onFailure: onFailure}
ast.Walk(w, file.AST)
return failures
}
// Name returns the rule name.
func (r *WaitGroupByValueRule) Name() string {
return "waitgroup-by-value"
}
type lintWaitGroupByValueRule struct {
onFailure func(lint.Failure)
}
func (w lintWaitGroupByValueRule) Visit(node ast.Node) ast.Visitor {
// look for function declarations
fd, ok := node.(*ast.FuncDecl)
if !ok {
return w
}
// Check all function's parameters
for _, field := range fd.Type.Params.List {
if !w.isWaitGroup(field.Type) {
continue
}
w.onFailure(lint.Failure{
Confidence: 1,
Node: field,
Failure: "sync.WaitGroup passed by value, the function will get a copy of the original one",
})
}
return nil
}
func (lintWaitGroupByValueRule) isWaitGroup(ft ast.Expr) bool {
se, ok := ft.(*ast.SelectorExpr)
if !ok {
return false
}
x, _ := se.X.(*ast.Ident)
sel := se.Sel.Name
return x.Name == "sync" && sel == "WaitGroup"
}
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