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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_cbsgvt6c71u0r22h4mm8tolesn, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
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<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
static new Map<S, S> slackGetUserName_map;

static synchronized S slackGetUserName(S token, S userID) {
  if (userID == null) ret null;
  S userName = slackGetUserName_map.get(userID);
  if (userName == null) pcall {
    userName = (S) slackGetUserInfo(token, userID).get("name");
    slackGetUserName_map.put(userID, userName);
  }
  ret userName;
}