Function AddKeyValueToMap

handler/handler_main.cc:265–281

Splits |key_value| on '=' and inserts the resulting key and value into |map|. If |key_value| has the wrong format, logs an error and returns false. If the key is already in the map, logs a warning, replaces the existing value, and returns true. If the key and value were inserted into the map, returns true. |argument| is used to give context to logged messages.

// returns true. If the key and value were inserted into the map, returns true.
// |argument| is used to give context to logged messages.
bool AddKeyValueToMap(std::map<std::string, std::string>* map,
                      const std::string& key_value,
                      const char* argument) {
  std::string key;
  std::string value;
  if (!SplitStringFirst(key_value, '=', &key, &value)) {
    LOG(ERROR) << argument << " requires KEY=VALUE";
    return false;
  }

  std::string old_value;
  if (!MapInsertOrReplace(map, key, value, &old_value)) {
    LOG(WARNING) << argument << " has duplicate key " << key
                 << ", discarding value " << old_value;
  }
  return true;
}

// Calls Metrics::HandlerLifetimeMilestone, but only on the first call. This is
// to prevent multiple exit events from inadvertently being recorded, which