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|
package rule
import (
"fmt"
"go/ast"
"github.com/mgechev/revive/lint"
)
// DeepExitRule lints program exit at functions other than main or init.
type DeepExitRule struct{}
// Apply applies the rule to given file.
func (r *DeepExitRule) Apply(file *lint.File, _ lint.Arguments) []lint.Failure {
var failures []lint.Failure
onFailure := func(failure lint.Failure) {
failures = append(failures, failure)
}
var exitFunctions = map[string]map[string]bool{
"os": map[string]bool{"Exit": true},
"syscall": map[string]bool{"Exit": true},
"log": map[string]bool{
"Fatal": true,
"Fatalf": true,
"Fatalln": true,
"Panic": true,
"Panicf": true,
"Panicln": true,
},
}
w := lintDeepExit{onFailure, exitFunctions, file.IsTest()}
ast.Walk(w, file.AST)
return failures
}
// Name returns the rule name.
func (r *DeepExitRule) Name() string {
return "deep-exit"
}
type lintDeepExit struct {
onFailure func(lint.Failure)
exitFunctions map[string]map[string]bool
isTestFile bool
}
func (w lintDeepExit) Visit(node ast.Node) ast.Visitor {
if fd, ok := node.(*ast.FuncDecl); ok {
if w.mustIgnore(fd) {
return nil // skip analysis of this function
}
return w
}
se, ok := node.(*ast.ExprStmt)
if !ok {
return w
}
ce, ok := se.X.(*ast.CallExpr)
if !ok {
return w
}
fc, ok := ce.Fun.(*ast.SelectorExpr)
if !ok {
return w
}
id, ok := fc.X.(*ast.Ident)
if !ok {
return w
}
fn := fc.Sel.Name
pkg := id.Name
if w.exitFunctions[pkg] != nil && w.exitFunctions[pkg][fn] { // it's a call to an exit function
w.onFailure(lint.Failure{
Confidence: 1,
Node: ce,
Category: "bad practice",
Failure: fmt.Sprintf("calls to %s.%s only in main() or init() functions", pkg, fn),
})
}
return w
}
func (w *lintDeepExit) mustIgnore(fd *ast.FuncDecl) bool {
fn := fd.Name.Name
return fn == "init" || fn == "main" || (w.isTestFile && fn == "TestMain")
}
|
