fix: different concreate types still cause panic (#4597)

rest/httpx/requests.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"reflect"
 	"strings"
-	"sync/atomic"
+	"sync"
 
 	"github.com/zeromicro/go-zero/core/mapping"
 	"github.com/zeromicro/go-zero/core/validation"
@@ -33,7 +33,11 @@ var (
 		pathKey,
 		mapping.WithStringValues(),
 		mapping.WithOpaqueKeys())
-	validator atomic.Value
+
+	// panic: sync/atomic: store of inconsistently typed value into Value
+	// don't use atomic.Value to store the validator, different concrete types still panic
+	validator     Validator
+	validatorLock sync.RWMutex
 )
 
 // Validator defines the interface for validating the request.
@@ -65,8 +69,8 @@ func Parse(r *http.Request, v any) error {
 
 	if valid, ok := v.(validation.Validator); ok {
 		return valid.Validate()
-	} else if val := validator.Load(); val != nil {
+	} else if val := getValidator(); val != nil {
-		return val.(Validator).Validate(r, v)
+		return val.Validate(r, v)
 	}
 
 	return nil
@@ -135,7 +139,15 @@ func ParsePath(r *http.Request, v any) error {
 // The validator is used to validate the request, only called in Parse,
 // not in ParseHeaders, ParseForm, ParseHeader, ParseJsonBody, ParsePath.
 func SetValidator(val Validator) {
-	validator.Store(val)
+	validatorLock.Lock()
+	defer validatorLock.Unlock()
+	validator = val
+}
+
+func getValidator() Validator {
+	validatorLock.RLock()
+	defer validatorLock.RUnlock()
+	return validator
 }
 
 func withJsonBody(r *http.Request) bool {

rest/httpx/requests_test.go

@@ -734,6 +734,22 @@ func TestParseJsonStringRequest(t *testing.T) {
 	})
 }
 
+type valid1 struct{}
+
+func (v valid1) Validate(*http.Request, any) error { return nil }
+
+type valid2 struct{}
+
+func (v valid2) Validate(*http.Request, any) error { return nil }
+
+func TestSetValidatorTwice(t *testing.T) {
+	// panic: sync/atomic: store of inconsistently typed value into Value
+	assert.NotPanics(t, func() {
+		SetValidator(valid1{})
+		SetValidator(valid2{})
+	})
+}
+
 func BenchmarkParseRaw(b *testing.B) {
 	r, err := http.NewRequest(http.MethodGet, "http://hello.com/a?name=hello&age=18&percent=3.4", http.NoBody)
 	if err != nil {