prosody
e77bf4222fae
plugins/mod_limits.lua

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plugins/mod_limits.lua @ 10228:e77bf4222fae

net.server_epoll: Add support for opportunistic writes This tries to flush data to the underlying sockets when receiving writes. This should lead to fewer timer objects being around. On the other hand, this leads to more and smaller writes which may translate to more TCP/IP packets being sent, depending on how the kernel handles this. This trades throughput for lower latency.
author Kim Alvefur <zash@zash.se>
date Wed, 28 Aug 2019 01:41:00 +0200
parent 10111:0f335815244f
child 10551:27b275633156
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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, 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 if session.conn and session.conn.setlimit then
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88 session.conn:setlimit(opts.bytes_per_second);
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89 -- Currently no burst support
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90 else
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91 session.throttle = throttle.create(opts.bytes_per_second * opts.burst_seconds, opts.burst_seconds);
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92 filters.add_filter(session, "bytes/in", filter_set.bytes_in, 1000);
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93 end
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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
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104
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105 function module.add_host(module)
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106 local unlimited_jids = module:get_option_inherited_set("unlimited_jids", {});
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107
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108 if not unlimited_jids:empty() then
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109 module:hook("authentication-success", function (event)
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110 local session = event.session;
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111 local session_type = session.type:match("^[^_]+");
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112 local jid = session.username .. "@" .. session.host;
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113 if unlimited_jids:contains(jid) then
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114 if session.conn and session.conn.setlimit then
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115 session.conn:setlimit(0);
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116 -- Currently no burst support
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117 else
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118 local filter_set = type_filters[session_type];
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parents: 9943
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119 filters.remove_filter(session, "bytes/in", filter_set.bytes_in);
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parents: 9943
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120 session.throttle = nil;
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parents: 9943
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121 end
9942
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parents: 9941
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122 end
b0d5f4ae92b7 mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
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parents: 9941
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123 end);
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parents: 9941
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124 end
b0d5f4ae92b7 mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
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parents: 9941
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125 end