class Clacky::Channel::Adapters::Weixin::Adapter

def fetch_typing_ticket(user_id, context_token)
  @typing_mutex.synchronize do
    entry = @typing_tickets[user_id]
    if entry && (Time.now.to_i - entry[:cached_at]) < TYPING_TICKET_TTL
      return entry[:ticket]
    end
  end
  ticket = @api_client.get_typing_ticket(
    ilink_user_id: user_id,
    context_token: context_token
  )
  return nil if ticket.empty?
  @typing_mutex.synchronize do
    @typing_tickets[user_id] = { ticket: ticket, cached_at: Time.now.to_i }
  end
  ticket
rescue => e
  Clacky::Logger.warn("[WeixinAdapter] getconfig failed for #{user_id}: #{e.message}")
  nil
end