Mercurial > prosody-modules
annotate mod_limits/mod_limits.lua @ 1473:31c4d92a81e5
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author | Matthew Wild <mwild1@gmail.com> |
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date | Sun, 27 Jul 2014 14:36:12 +0100 (2014-07-27) |
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1 -- mod_limits: Rate-limiting for Prosody |
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2 -- Version: Alpha |
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3 -- Author: Matthew Wild <mwild1@gmail.com> |
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4 |
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5 -- Because we deal we pre-authed sessions and streams we can't be host-specific |
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6 module:set_global(); |
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7 |
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8 local filters = require "util.filters"; |
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9 local throttle = require "util.throttle"; |
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10 local timer = require "util.timer"; |
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11 |
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12 local limits_cfg = module:get_option("limits", {}); |
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13 local limits_resolution = module:get_option_number("limits_resolution", 1); |
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14 |
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15 local default_bytes_per_second = 3000; |
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16 local default_burst = 2; |
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17 |
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18 local rate_units = { b = 1, k = 3, m = 6, g = 9, t = 12 } -- Plan for the future. |
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19 local function parse_rate(rate, sess_type) |
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20 local quantity, unit, exp; |
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21 if rate then |
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22 quantity, unit = rate:match("^(%d+) ?([^/]+)/s$"); |
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23 exp = quantity and rate_units[unit:sub(1,1):lower()]; |
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24 end |
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25 if not exp then |
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26 module:log("error", "Error parsing rate for %s: %q, using default rate (%d bytes/s)", sess_type, rate, default_bytes_per_second); |
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27 return default_bytes_per_second; |
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28 end |
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29 return quantity*(10^exp); |
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30 end |
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31 |
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32 local function parse_burst(burst, sess_type) |
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33 if type(burst) == "string" then |
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34 burst = burst:match("^(%d+) ?s$"); |
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35 end |
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36 local n_burst = tonumber(burst); |
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37 if not n_burst then |
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38 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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39 end |
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40 return n_burst or default_burst; |
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41 end |
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42 |
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43 -- Process config option into limits table: |
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44 -- limits = { c2s = { bytes_per_second = X, burst_seconds = Y } } |
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45 local limits = {}; |
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46 |
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47 for sess_type, sess_limits in pairs(limits_cfg) do |
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48 limits[sess_type] = { |
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49 bytes_per_second = parse_rate(sess_limits.rate, sess_type); |
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50 burst_seconds = parse_burst(sess_limits.burst, sess_type); |
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51 }; |
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52 end |
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53 |
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54 local default_filter_set = {}; |
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55 |
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56 function default_filter_set.bytes_in(bytes, session) |
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57 local throttle = session.throttle; |
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58 if throttle then |
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59 local ok, balance, outstanding = throttle:poll(#bytes, true); |
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60 if not ok then |
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61 session.log("debug", "Session over rate limit (%d) with %d (by %d), pausing", throttle.max, #bytes, outstanding); |
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62 session.conn:pause(); -- Read no more data from the connection until there is no outstanding data |
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63 local outstanding_data = bytes:sub(-outstanding); |
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64 bytes = bytes:sub(1, #bytes-outstanding); |
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65 timer.add_task(limits_resolution, function () |
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66 if not session.conn then return; end |
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67 if throttle:peek(#outstanding_data) then |
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68 session.log("debug", "Resuming paused session"); session.conn:resume(); |
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69 end |
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70 -- Handle what we can of the outstanding data |
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71 session.data(outstanding_data); |
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72 end); |
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73 end |
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74 end |
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75 return bytes; |
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76 end |
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77 |
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78 local type_filters = { |
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79 c2s = default_filter_set; |
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80 s2sin = default_filter_set; |
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81 s2sout = default_filter_set; |
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82 }; |
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83 |
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84 local function filter_hook(session) |
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85 local session_type = session.type:match("^[^_]+"); |
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86 local filter_set, opts = type_filters[session_type], limits[session_type]; |
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87 if opts then |
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88 session.throttle = throttle.create(opts.bytes_per_second * opts.burst_seconds, opts.burst_seconds); |
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89 filters.add_filter(session, "bytes/in", filter_set.bytes_in, 1000); |
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90 end |
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91 end |
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92 |
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93 function module.load() |
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94 filters.add_filter_hook(filter_hook); |
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95 end |
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96 |
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97 function module.unload() |
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98 filters.remove_filter_hook(filter_hook); |
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99 end |