prosody
c523642ea293
plugins/mod_limits.lua

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plugins/mod_limits.lua @ 10049:c523642ea293

util.dependencies: Increase Lua version to warn about to 5.4 No significant problems have been encountered with Lua 5.3 itself, so apart from some odd problems in LuaExpat it seems about time to declare it ready.
author Kim Alvefur <zash@zash.se>
date Wed, 19 Jun 2019 19:16:09 +0200
parent 9943:46773fe2be45
child 10099:7e3196e0263e
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rev   line source
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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:empty() 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