add '// @contextcheck(req_has_ctx)'

contextcheck.go

@@ -68,6 +68,10 @@ var (
 type resInfo struct {
 	Valid bool
 	Funcs []string
+
+	// reuse for doc
+	ReqCtx bool
+	Skip   bool
 }
 
 type ctxFact map[string]resInfo
@@ -238,24 +242,45 @@ func (r *runner) checkIsEntry(f *ssa.Function) entryType {
 		return EntryWithCtx
 	}
 
+	reqctx, skip := r.docFlag(f)
+
 	// check is `func handler(w http.ResponseWriter, r *http.Request) {}`
-	if r.checkIsHttpHandler(f) {
+	// or use '// @contextcheck(req_has_ctx)'
+	if r.checkIsHttpHandler(f, reqctx) {
 		return EntryWithHttpHandler
 	}
 
-	if r.skipByNolint(f) {
+	if skip {
 		return EntryNone
 	}
 
 	return EntryNormal
 }
 
+func (r *runner) docFlag(f *ssa.Function) (reqctx, skip bool) {
+	key := "doc:" + f.RelString(nil)
+	res, ok := r.getValue(key, f)
+	if ok {
+		return res.ReqCtx, res.Skip
+	}
+
+	for _, v := range r.getDocFromFunc(f) {
+		if len(nolintRe.FindString(v.Text)) > 0 && strings.Contains(v.Text, "contextcheck") {
+			res.Skip = true
+		} else if strings.HasPrefix(v.Text, "// @contextcheck(req_has_ctx)") {
+			res.ReqCtx = true
+		}
+	}
+	r.currentFact[key] = res
+	return res.ReqCtx, res.Skip
+}
+
 var nolintRe = regexp.MustCompile(`^//\s?nolint:`)
 
-func (r *runner) skipByNolint(f *ssa.Function) bool {
+func (r *runner) getDocFromFunc(f *ssa.Function) []*ast.Comment {
 	file := analysisutil.File(r.pass, f.Pos())
 	if file == nil {
-		return false
+		return nil
 	}
 
 	// only support FuncDecl comment
@@ -267,15 +292,9 @@ func (r *runner) skipByNolint(f *ssa.Function) bool {
 		}
 	}
 	if fd == nil || fd.Doc == nil || len(fd.Doc.List) == 0 {
-		return false
-	}
-
-	for _, v := range fd.Doc.List {
-		if len(nolintRe.FindString(v.Text)) > 0 && strings.Contains(v.Text, "contextcheck") {
-			return true
-		}
+		return nil
 	}
-	return false
+	return fd.Doc.List
 }
 
 func (r *runner) checkIsCtx(f *ssa.Function) (in, out bool) {
@@ -307,7 +326,16 @@ func (r *runner) checkIsCtx(f *ssa.Function) (in, out bool) {
 	return
 }
 
-func (r *runner) checkIsHttpHandler(f *ssa.Function) bool {
+func (r *runner) checkIsHttpHandler(f *ssa.Function, reqctx bool) bool {
+	if reqctx {
+		tuple := f.Signature.Params()
+		for i := 0; i < tuple.Len(); i++ {
+			if r.isHttpReqType(tuple.At(i).Type()) {
+				return true
+			}
+		}
+	}
+
 	// must has no result
 	if f.Signature.Results().Len() > 0 {
 		return false

testdata/src/a/a.go

@@ -114,6 +114,11 @@ func f14(w http.ResponseWriter, r *http.Request, err error) {
 	f8(r.Context(), w, r)
 }
 
+// @contextcheck(req_has_ctx)
+func f15(w http.ResponseWriter, r *http.Request, err error) {
+	f8(r.Context(), w, r)
+}
+
 func f11() {
 	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
 		f8(r.Context(), w, r)
@@ -125,6 +130,7 @@ func f11() {
 		f10(true, w, r) // want "Function `f10` should pass the context parameter"
 
 		f14(w, r, nil)
+		f15(w, r, nil)
 	})
 }