refactor: Remove outdated libevent logging code

The removed code was intended to catch issues with event_enable_debug_logging which was not available prior to libevent 2.1.1. This is not necessary since the minimum libevent version was bumped to 2.1.8.

Author: fjahr

src/httpserver.cpp

@@ -358,12 +358,8 @@ bool InitHTTPServer()
 
     // Redirect libevent's logging to our own log
     event_set_log_callback(&libevent_log_cb);
-    // Update libevent's log handling. Returns false if our version of
-    // libevent doesn't support debug logging, in which case we should
-    // clear the BCLog::LIBEVENT flag.
-    if (!UpdateHTTPServerLogging(LogInstance().WillLogCategory(BCLog::LIBEVENT))) {
-        LogInstance().DisableCategory(BCLog::LIBEVENT);
-    }
+    // Update libevent's log handling.
+    UpdateHTTPServerLogging(LogInstance().WillLogCategory(BCLog::LIBEVENT));
 
 #ifdef WIN32
     evthread_use_windows_threads();
@@ -402,13 +398,12 @@ bool InitHTTPServer()
     return true;
 }
 
-bool UpdateHTTPServerLogging(bool enable) {
+void UpdateHTTPServerLogging(bool enable) {
     if (enable) {
         event_enable_debug_logging(EVENT_DBG_ALL);
     } else {
         event_enable_debug_logging(EVENT_DBG_NONE);
     }
-    return true;
 }
 
 static std::thread g_thread_http;

src/httpserver.h

@@ -31,9 +31,8 @@ void InterruptHTTPServer();
 /** Stop HTTP server */
 void StopHTTPServer();
 
-/** Change logging level for libevent. Removes BCLog::LIBEVENT from log categories if
- * libevent doesn't support debug logging.*/
-bool UpdateHTTPServerLogging(bool enable);
+/** Change logging level for libevent. */
+void UpdateHTTPServerLogging(bool enable);
 
 /** Handler for requests to a certain HTTP path */
 typedef std::function<bool(HTTPRequest* req, const std::string &)> HTTPRequestHandler;

src/rpc/misc.cpp

@@ -646,17 +646,8 @@ static RPCHelpMan logging()
     uint32_t changed_log_categories = original_log_categories ^ updated_log_categories;
 
     // Update libevent logging if BCLog::LIBEVENT has changed.
-    // If the library version doesn't allow it, UpdateHTTPServerLogging() returns false,
-    // in which case we should clear the BCLog::LIBEVENT flag.
-    // Throw an error if the user has explicitly asked to change only the libevent
-    // flag and it failed.
     if (changed_log_categories & BCLog::LIBEVENT) {
-        if (!UpdateHTTPServerLogging(LogInstance().WillLogCategory(BCLog::LIBEVENT))) {
-            LogInstance().DisableCategory(BCLog::LIBEVENT);
-            if (changed_log_categories == BCLog::LIBEVENT) {
-            throw JSONRPCError(RPC_INVALID_PARAMETER, "libevent logging cannot be updated when using libevent before v2.1.1.");
-            }
-        }
+        UpdateHTTPServerLogging(LogInstance().WillLogCategory(BCLog::LIBEVENT));
     }
 
     UniValue result(UniValue::VOBJ);