[bugfix] return 400 Bad Request on more cases of malformed AS data (#2399)

vendor/codeberg.org/gruf/go-errors/v2/once.go

@@ -2,46 +2,30 @@ package errors
 
 import (
 	"sync/atomic"
-	"unsafe"
 )
 
 // OnceError is an error structure that supports safe multi
 // threaded usage and setting only once (until reset).
-type OnceError struct{ err unsafe.Pointer }
-
-// NewOnce returns a new OnceError instance.
-func NewOnce() OnceError {
-	return OnceError{
-		err: nil,
-	}
-}
+type OnceError struct{ ptr atomic.Pointer[error] }
 
 // Store will safely set the OnceError to value, no-op if nil.
-func (e *OnceError) Store(err error) {
-	// Nothing to do
+func (e *OnceError) Store(err error) bool {
 	if err == nil {
-		return
+		return false
 	}
-
-	// Only set if not already
-	atomic.CompareAndSwapPointer(
-		&e.err,
-		nil,
-		unsafe.Pointer(&err),
-	)
+	return e.ptr.CompareAndSwap(nil, &err)
 }
 
 // Load will load the currently stored error.
 func (e *OnceError) Load() error {
-	return *(*error)(atomic.LoadPointer(&e.err))
+	if ptr := e.ptr.Load(); ptr != nil {
+		return *ptr
+	}
+	return nil
 }
 
 // IsSet returns whether OnceError has been set.
-func (e *OnceError) IsSet() bool {
-	return (atomic.LoadPointer(&e.err) != nil)
-}
+func (e *OnceError) IsSet() bool { return (e.ptr.Load() != nil) }
 
 // Reset will reset the OnceError value.
-func (e *OnceError) Reset() {
-	atomic.StorePointer(&e.err, nil)
-}
+func (e *OnceError) Reset() { e.ptr.Store(nil) }