public User getUser(Event event) {
    try {
      Response<User> userResponse = gitLabService.getUser(event.getUserId());
      Preconditions.checkArgument(userResponse.code() == 200);

      return userResponse.body();
    } catch (Exception e) {
      log.error(
          "Unable to get gitlab user with id <{}>, comment issue with pusher username <{}>",
          event.getUserId(),
          event.getUserName());
      return new User(event.getUserId(), null, event.getUserName());
    }
  }
  public void performPushEvent(Event event) {
    Preconditions.checkNotNull(event.getCommits(), "commits array can not be null");
    // For each commit, extract jira issues
    Multimap<String, Commit> jiraIssues = ArrayListMultimap.create();
    event
        .getCommits()
        .forEach(
            commit ->
                jiraService
                    .extractIssuesFromMessage(commit.getMessage())
                    .forEach(issue -> jiraIssues.put(issue, commit)));

    if (jiraIssues.size() > 0) {
      User user = getUser(event);

      jiraIssues
          .asMap()
          .forEach(
              (issue, commits) ->
                  commentIssue(event.getRepository().getName(), user, commits, issue));
    }
  }