prosody
d336b28b4002
plugins/mod_limits.lua

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plugins/mod_limits.lua @ 11395:d336b28b4002

mod_http_errors: Style tweak Weird to have the background all the way to the edge of the viewport. Would be nice if this could be done without the extra span.
author Kim Alvefur <zash@zash.se>
date Sun, 21 Feb 2021 07:59:17 +0100
parent 10551:27b275633156
child 11560:3bbb1af92514
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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, _, 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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Kim Alvefur <zash@zash.se>
parents: 9943
diff changeset
119 filters.remove_filter(session, "bytes/in", filter_set.bytes_in);
7e3196e0263e mod_limits: Use rate limiting in net.server if provided
Kim Alvefur <zash@zash.se>
parents: 9943
diff changeset
120 session.throttle = nil;
7e3196e0263e mod_limits: Use rate limiting in net.server if provided
Kim Alvefur <zash@zash.se>
parents: 9943
diff changeset
121 end
9942
b0d5f4ae92b7 mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
Kim Alvefur <zash@zash.se>
parents: 9941
diff changeset
122 end
b0d5f4ae92b7 mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
Kim Alvefur <zash@zash.se>
parents: 9941
diff changeset
123 end);
b0d5f4ae92b7 mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
Kim Alvefur <zash@zash.se>
parents: 9941
diff changeset
124 end
b0d5f4ae92b7 mod_limits: Allow configuring a list of unrestricted JIDs (fixes #1323)
Kim Alvefur <zash@zash.se>
parents: 9941
diff changeset
125 end