prosody
542a9a503073
plugins/mod_limits.lua

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plugins/mod_limits.lua @ 11961:542a9a503073

util.async: Add sleep() method with configurable scheduling backend No scheduler set by default, so it will error (we plan to initialize it in util.startup). We wanted to avoid a hard dependency on util.timer (which in turn depends on network backends, etc.), and we didn't add timer.sleep() because we didn't want to add a hard dependency on util.async for things that don't need it.
author Matthew Wild <mwild1@gmail.com>
date Mon, 29 Nov 2021 14:11:24 +0000
parent 11735:7d29167bfcc3
child 12977:74b9e05af71e
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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 burst and 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, 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 c2s = {
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44 bytes_per_second = 10 * 1024;
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45 burst_seconds = 2;
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46 };
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47 s2sin = {
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48 bytes_per_second = 30 * 1024;
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49 burst_seconds = 2;
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50 };
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51 };
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52
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53 for sess_type, sess_limits in pairs(limits_cfg) do
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54 limits[sess_type] = {
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55 bytes_per_second = parse_rate(sess_limits.rate, sess_type);
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56 burst_seconds = parse_burst(sess_limits.burst, sess_type);
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57 };
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58 end
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59
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60 local default_filter_set = {};
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61
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62 function default_filter_set.bytes_in(bytes, session)
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63 local sess_throttle = session.throttle;
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64 if sess_throttle then
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65 local ok, _, outstanding = sess_throttle:poll(#bytes, true);
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66 if not ok then
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67 session.log("debug", "Session over rate limit (%d) with %d (by %d), pausing", sess_throttle.max, #bytes, outstanding);
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68 outstanding = ceil(outstanding);
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69 session.conn:pause(); -- Read no more data from the connection until there is no outstanding data
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70 local outstanding_data = bytes:sub(-outstanding);
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71 bytes = bytes:sub(1, #bytes-outstanding);
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72 timer.add_task(limits_resolution, function ()
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73 if not session.conn then return; end
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74 if sess_throttle:peek(#outstanding_data) then
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75 session.log("debug", "Resuming paused session");
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76 session.conn:resume();
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77 end
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78 -- Handle what we can of the outstanding data
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79 session.data(outstanding_data);
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80 end);
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81 end
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82 end
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83 return bytes;
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84 end
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85
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86 local type_filters = {
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87 c2s = default_filter_set;
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88 s2sin = default_filter_set;
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89 s2sout = default_filter_set;
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90 };
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91
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92 local function filter_hook(session)
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93 local session_type = session.type:match("^[^_]+");
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94 local filter_set, opts = type_filters[session_type], limits[session_type];
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95 if opts then
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96 if session.conn and session.conn.setlimit then
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97 session.conn:setlimit(opts.bytes_per_second);
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98 -- Currently no burst support
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99 else
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100 session.throttle = throttle.create(opts.bytes_per_second * opts.burst_seconds, opts.burst_seconds);
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101 filters.add_filter(session, "bytes/in", filter_set.bytes_in, 1000);
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102 end
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103 end
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104 end
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105
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106 function module.load()
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107 filters.add_filter_hook(filter_hook);
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108 end
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109
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110 function module.unload()
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111 filters.remove_filter_hook(filter_hook);
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112 end
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113
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114 function unlimited(session)
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115 local session_type = session.type:match("^[^_]+");
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116 if session.conn and session.conn.setlimit then
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117 session.conn:setlimit(0);
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118 -- Currently no burst support
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119 else
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120 local filter_set = type_filters[session_type];
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121 filters.remove_filter(session, "bytes/in", filter_set.bytes_in);
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122 session.throttle = nil;
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123 end
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124 end
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125
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126 function module.add_host(module)
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127 local unlimited_jids = module:get_option_inherited_set("unlimited_jids", {});
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128
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129 if not unlimited_jids:empty() then
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130 module:hook("authentication-success", function (event)
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131 local session = event.session;
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132 local jid = session.username .. "@" .. session.host;
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133 if unlimited_jids:contains(jid) then
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134 unlimited(session);
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135 end
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136 end);
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137
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138 module:hook("s2sout-established", function (event)
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139 local session = event.session;
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140 if unlimited_jids:contains(session.to_host) then
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141 unlimited(session);
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142 end
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143 end);
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144
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145 module:hook("s2sin-established", function (event)
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146 local session = event.session;
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147 if session.from_host and unlimited_jids:contains(session.from_host) then
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148 unlimited(session);
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149 end
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150 end);
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151
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152 end
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153 end