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annotate mod_firewall/definitions.lib.lua @ 2388:b6d59998dba7

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mod_firewall: README: Document dynamic '$local' zone
author Matthew Wild <mwild1@gmail.com>
date Sat, 19 Nov 2016 16:00:03 +0000
parents 5fe483b73fd2
children c6fd8975704b
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1
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2 -- Name arguments are unused here
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3 -- luacheck: ignore 212
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5 local definition_handlers = {};
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92602cfac751 mod_firewall: Fix missing import of util.set (used to be global)
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7 local set = require"util.set";
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8 local new_throttle = require "util.throttle".create;
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10 local multirate_cache_size = module:get_option_number("firewall_multirate_cache_limit", 1000);
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12 function definition_handlers.ZONE(zone_name, zone_members)
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13 local zone_member_list = {};
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14 for member in zone_members:gmatch("[^, ]+") do
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15 zone_member_list[#zone_member_list+1] = member;
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16 end
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17 return set.new(zone_member_list)._items;
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18 end
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20 -- Helper function used by RATE handler
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21 local function evict_only_unthrottled(name, throttle)
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22 throttle:update();
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23 -- Check whether the throttle is at max balance (i.e. totally safe to forget about it)
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24 if throttle.balance < throttle.max then
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25 -- Not safe to forget
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26 return false;
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27 end
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28 end
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30 function definition_handlers.RATE(name, line)
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31 local rate = assert(tonumber(line:match("([%d.]+)")), "Unable to parse rate");
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32 local burst = tonumber(line:match("%(%s*burst%s+([%d.]+)%s*%)")) or 1;
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33 local max_throttles = tonumber(line:match("%(%s*entries%s+([%d]+)%s*%)")) or multirate_cache_size;
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34 local deny_when_full = not line:match("%(allow overflow%)");
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35 return {
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36 single = function ()
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37 return new_throttle(rate*burst, burst);
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38 end;
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40 multi = function ()
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41 local cache = require "util.cache".new(max_throttles, deny_when_full and evict_only_unthrottled or nil);
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42 return {
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43 poll_on = function (_, key, amount)
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44 assert(key, "no key");
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45 local throttle = cache:get(key);
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46 if not throttle then
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47 throttle = new_throttle(rate*burst, burst);
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48 if not cache:set(key, throttle) then
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49 module:log("warn", "Multirate '%s' has hit its maximum number of active throttles (%d), denying new events", name, max_throttles);
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50 return false;
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51 end
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52 end
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53 return throttle:poll(amount);
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54 end;
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55 }
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56 end;
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57 };
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58 end
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60 return definition_handlers;
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