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annotate mod_firewall/definitions.lib.lua @ 2130:9239893a2400

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mod_firewall: Don't use util.cache unless it's needed, and add explanatory error if it is not available
author Matthew Wild <mwild1@gmail.com>
date Fri, 18 Mar 2016 09:57:09 +0000
parents 21bc4d7cddae
children ba42c8882026
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2079
edec9de0220a mod_firewall: Silence warnings about unused arguments [luacheck]
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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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9 local new_cache = require "util.cache".new;
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11 local multirate_cache_size = module:get_option_number("firewall_multirate_cache_limit", 1000);
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197af8440ffb mod_firewall: Make defining objects generic (currently zones and rate limits), so more can easily be added. Also a syntax change... definition lines must begin with %
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13 function definition_handlers.ZONE(zone_name, zone_members)
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14 local zone_member_list = {};
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15 for member in zone_members:gmatch("[^, ]+") do
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16 zone_member_list[#zone_member_list+1] = member;
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17 end
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18 return set.new(zone_member_list)._items;
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19 end
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21 -- Helper function used by RATE handler
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22 local function evict_only_unthrottled(name, throttle)
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23 throttle:update();
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24 -- Check whether the throttle is at max balance (i.e. totally safe to forget about it)
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25 if throttle.balance < throttle.max then
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26 -- Not safe to forget
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27 return false;
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28 end
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29 end
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31 function definition_handlers.RATE(name, line)
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32 local rate = assert(tonumber(line:match("([%d.]+)")), "Unable to parse rate");
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33 local burst = tonumber(line:match("%(%s*burst%s+([%d.]+)%s*%)")) or 1;
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34 local max_throttles = tonumber(line:match("%(%s*entries%s+([%d]+)%s*%)")) or multirate_cache_size;
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35
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36 return {
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37 single = function ()
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38 return new_throttle(rate*burst, burst);
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39 end;
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40
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41 multi = function ()
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9239893a2400 mod_firewall: Don't use util.cache unless it's needed, and add explanatory error if it is not available
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42 local cache = new_cache(max_throttles, evict_only_unthrottled);
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43 return {
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44 poll_on = function (_, key, amount)
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45 assert(key, "no key");
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46 local throttle = cache:get(key);
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47 if not throttle then
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48 throttle = new_throttle(rate*burst, burst);
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49 if not cache:set(key, throttle) then
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50 module:log("warn", "Multirate '%s' has hit its maximum number of active throttles (%d), denying new events", name, max_throttles);
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51 return false;
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52 end
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53 end
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54 return throttle:poll(amount);
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55 end;
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56 }
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57 end;
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58 };
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59 end
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61 return definition_handlers;