Simplify function parameters

psiphon/server/api.go

@@ -98,7 +98,7 @@ func dispatchAPIRequestHandler(
 	// terminating in the case of a bug.
 	defer func() {
 		if e := recover(); e != nil {
-			log.LogPanicRecover(e, string(debug.Stack()))
+			log.LogPanicRecover(e, debug.Stack())
 			reterr = common.ContextError(errors.New("request handler panic"))
 		}
 	}()

psiphon/server/log.go

@@ -100,12 +100,12 @@ func (logger *ContextLogger) LogRawFieldsWithTimestamp(fields LogFields) {
 
 // LogPanicRecover calls LogRawFieldsWithTimestamp with standard fields
 // for logging recovered panics.
-func (logger *ContextLogger) LogPanicRecover(recoverValue interface{}, stack string) {
+func (logger *ContextLogger) LogPanicRecover(recoverValue interface{}, stack []byte) {
 	log.LogRawFieldsWithTimestamp(
 		LogFields{
 			"event_name":    "panic",
 			"recover_value": recoverValue,
-			"stack":         stack,
+			"stack":         string(stack),
 		})
 }