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annotate mod_limits/mod_limits.lua @ 3972:45c5603a6c07

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mod_muc_markers: New module for server-side receipt tracking in MUCs
author Matthew Wild <mwild1@gmail.com>
date Mon, 13 Apr 2020 15:48:58 +0100
parents 1bb2a90398d3
children
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1 -- mod_limits: Rate-limiting for Prosody
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2 -- Version: Alpha
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3 -- Author: Matthew Wild <mwild1@gmail.com>
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4
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5 -- Because we deal we pre-authed sessions and streams we can't be host-specific
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6 module:set_global();
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7
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8 local filters = require "util.filters";
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9 local throttle = require "util.throttle";
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10 local timer = require "util.timer";
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11 local ceil = math.ceil;
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12
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13 local limits_cfg = module:get_option("limits", {});
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14 local limits_resolution = module:get_option_number("limits_resolution", 1);
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15
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16 local default_bytes_per_second = 3000;
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17 local default_burst = 2;
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18
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19 local rate_units = { b = 1, k = 3, m = 6, g = 9, t = 12 } -- Plan for the future.
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20 local function parse_rate(rate, sess_type)
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21 local quantity, unit, exp;
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22 if rate then
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23 quantity, unit = rate:match("^(%d+) ?([^/]+)/s$");
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24 exp = quantity and rate_units[unit:sub(1,1):lower()];
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25 end
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26 if not exp then
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27 module:log("error", "Error parsing rate for %s: %q, using default rate (%d bytes/s)", sess_type, rate, default_bytes_per_second);
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28 return default_bytes_per_second;
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29 end
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30 return quantity*(10^exp);
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31 end
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32
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33 local function parse_burst(burst, sess_type)
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34 if type(burst) == "string" then
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35 burst = burst:match("^(%d+) ?s$");
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36 end
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37 local n_burst = tonumber(burst);
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38 if not n_burst then
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39 module:log("error", "Unable to parse burst for %s: %q, using default burst interval (%ds)", sess_type, tostring(burst), default_burst);
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40 end
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41 return n_burst or default_burst;
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42 end
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43
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44 -- Process config option into limits table:
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45 -- limits = { c2s = { bytes_per_second = X, burst_seconds = Y } }
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46 local limits = {};
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47
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48 for sess_type, sess_limits in pairs(limits_cfg) do
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49 limits[sess_type] = {
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50 bytes_per_second = parse_rate(sess_limits.rate, sess_type);
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51 burst_seconds = parse_burst(sess_limits.burst, sess_type);
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52 };
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53 end
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54
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55 local default_filter_set = {};
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56
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57 function default_filter_set.bytes_in(bytes, session)
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58 local throttle = session.throttle;
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59 if throttle then
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60 local ok, balance, outstanding = throttle:poll(#bytes, true);
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61 if not ok then
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62 session.log("debug", "Session %q over rate limit (%d) with %d (by %d), pausing", session.full_jid or session.from_host or session.to_host, throttle.max, #bytes, outstanding);
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63 outstanding = ceil(outstanding);
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64 session.conn:pause(); -- Read no more data from the connection until there is no outstanding data
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65 local outstanding_data = bytes:sub(-outstanding);
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66 bytes = bytes:sub(1, #bytes-outstanding);
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67 timer.add_task(limits_resolution, function ()
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68 if not session.conn then return; end
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69 if throttle:peek(#outstanding_data) then
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70 session.log("debug", "Resuming paused session");
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71 session.conn:resume();
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72 end
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73 session.log("debug", "mod_limits feeding %d bytes of delayed data into stream", #outstanding_data);
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74 -- Handle what we can of the outstanding data
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75 session.data(outstanding_data);
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76 end);
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77 end
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78 end
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79 return bytes;
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80 end
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81
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82 local type_filters = {
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83 c2s = default_filter_set;
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84 s2sin = default_filter_set;
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85 s2sout = default_filter_set;
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86 };
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87
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88 local function filter_hook(session)
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89 local session_type = session.type:match("^[^_]+");
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90 local filter_set, opts = type_filters[session_type], limits[session_type];
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91 if opts then
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92 session.throttle = throttle.create(opts.bytes_per_second * opts.burst_seconds, opts.burst_seconds);
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93 filters.add_filter(session, "bytes/in", filter_set.bytes_in, 1000);
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94 end
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95 end
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96
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97 function module.load()
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98 filters.add_filter_hook(filter_hook);
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99 end
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100
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101 function module.unload()
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102 filters.remove_filter_hook(filter_hook);
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103 end