prosody
b0d5f4ae92b7
plugins/mod_limits.lua

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plugins/mod_limits.lua @ 9942:b0d5f4ae92b7

mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
author Kim Alvefur <zash@zash.se>
date Tue, 02 Apr 2019 20:38:51 +0200
parent 9941:a2f8d54dd445
child 9943:46773fe2be45
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8453
6b3e7fddd723 mod_limits: Fix typo in comment
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1 -- Because we deal with pre-authed sessions and streams we can't be host-specific
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2 module:set_global();
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3
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4 local filters = require "util.filters";
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5 local throttle = require "util.throttle";
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6 local timer = require "util.timer";
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7 local ceil = math.ceil;
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8
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9 local limits_cfg = module:get_option("limits", {});
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10 local limits_resolution = module:get_option_number("limits_resolution", 1);
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11
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12 local default_bytes_per_second = 3000;
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13 local default_burst = 2;
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14
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15 local rate_units = { b = 1, k = 3, m = 6, g = 9, t = 12 } -- Plan for the future.
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16 local function parse_rate(rate, sess_type)
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17 local quantity, unit, exp;
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18 if rate then
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19 quantity, unit = rate:match("^(%d+) ?([^/]+)/s$");
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20 exp = quantity and rate_units[unit:sub(1,1):lower()];
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21 end
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22 if not exp then
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23 module:log("error", "Error parsing rate for %s: %q, using default rate (%d bytes/s)", sess_type, rate, default_bytes_per_second);
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24 return default_bytes_per_second;
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25 end
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26 return quantity*(10^exp);
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27 end
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28
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29 local function parse_burst(burst, sess_type)
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30 if type(burst) == "string" then
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31 burst = burst:match("^(%d+) ?s$");
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32 end
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33 local n_burst = tonumber(burst);
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34 if not n_burst then
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35 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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36 end
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37 return n_burst or default_burst;
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38 end
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39
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40 -- Process config option into limits table:
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41 -- limits = { c2s = { bytes_per_second = X, burst_seconds = Y } }
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42 local limits = {};
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43
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44 for sess_type, sess_limits in pairs(limits_cfg) do
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45 limits[sess_type] = {
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46 bytes_per_second = parse_rate(sess_limits.rate, sess_type);
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47 burst_seconds = parse_burst(sess_limits.burst, sess_type);
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48 };
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49 end
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50
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51 local default_filter_set = {};
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52
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53 function default_filter_set.bytes_in(bytes, session)
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54 local sess_throttle = session.throttle;
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55 if sess_throttle then
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56 local ok, balance, outstanding = sess_throttle:poll(#bytes, true);
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57 if not ok then
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58 session.log("debug", "Session over rate limit (%d) with %d (by %d), pausing", sess_throttle.max, #bytes, outstanding);
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59 outstanding = ceil(outstanding);
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60 session.conn:pause(); -- Read no more data from the connection until there is no outstanding data
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61 local outstanding_data = bytes:sub(-outstanding);
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62 bytes = bytes:sub(1, #bytes-outstanding);
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63 timer.add_task(limits_resolution, function ()
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64 if not session.conn then return; end
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65 if sess_throttle:peek(#outstanding_data) then
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66 session.log("debug", "Resuming paused session");
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67 session.conn:resume();
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68 end
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69 -- Handle what we can of the outstanding data
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70 session.data(outstanding_data);
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71 end);
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72 end
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73 end
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74 return bytes;
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75 end
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76
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77 local type_filters = {
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78 c2s = default_filter_set;
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79 s2sin = default_filter_set;
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80 s2sout = default_filter_set;
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81 };
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82
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83 local function filter_hook(session)
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84 local session_type = session.type:match("^[^_]+");
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85 local filter_set, opts = type_filters[session_type], limits[session_type];
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86 if opts then
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87 session.throttle = throttle.create(opts.bytes_per_second * opts.burst_seconds, opts.burst_seconds);
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88 filters.add_filter(session, "bytes/in", filter_set.bytes_in, 1000);
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89 end
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90 end
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91
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92 function module.load()
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93 filters.add_filter_hook(filter_hook);
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94 end
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95
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96 function module.unload()
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97 filters.remove_filter_hook(filter_hook);
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98 end
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99
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100 function module.add_host(module)
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101 local unlimited_jids = module:get_option_inherited_set("unlimited_jids", {});
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102
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103 if not unlimited_jids:empy() then
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104 module:hook("authentication-success", function (event)
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105 local session = event.session;
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106 local session_type = session.type:match("^[^_]+");
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107 local jid = session.username .. "@" .. session.host;
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108 if unlimited_jids:contains(jid) then
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109 local filter_set = type_filters[session_type];
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110 filters.remove_filter(session, "bytes/in", filter_set.bytes_in);
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111 session.throttle = nil;
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112 end
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113 end);
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114 end
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115 end