prosody-modules
85c357b69eec
mod_pubsub_mqtt/mqtt.lib.lua

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mod_pubsub_mqtt/mqtt.lib.lua @ 3532:85c357b69eec

mod_csi_muc_priorities: Reduce importance of group chat messages This helps if you are in more noisy public channels than small private group chats. The short term plan is to give users the ability to set MUC JIDs as either high or low priority and use that. Long term it would be great to be able to automatically classify MUCs as public channels vs private group chats.
author Kim Alvefur <zash@zash.se>
date Mon, 01 Apr 2019 00:15:13 +0200
parent 1343:7dbde05b48a9
child 5114:d2a84e6aed2b
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rev   line source
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e0d97eb52ab8 mod_pubsub_mqtt: MQTT (a lightweight binary pubsub protocol) interface for mod_pubsub
Matthew Wild <mwild1@gmail.com>
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diff changeset
1 local bit = require "bit";
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2
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3 local stream_mt = {};
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4 stream_mt.__index = stream_mt;
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5
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6 function stream_mt:read_bytes(n_bytes)
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7 module:log("debug", "Reading %d bytes... (buffer: %d)", n_bytes, #self.buffer);
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8 local data = self.buffer;
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9 if not data then
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10 module:log("debug", "No data, pausing.");
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11 data = coroutine.yield();
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12 module:log("debug", "Have %d bytes of data now (want %d)", #data, n_bytes);
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13 end
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14 if #data >= n_bytes then
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15 data, self.buffer = data:sub(1, n_bytes), data:sub(n_bytes+1);
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16 elseif #data < n_bytes then
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17 module:log("debug", "Not enough data (only %d bytes out of %d), pausing.", #data, n_bytes);
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18 self.buffer = data..coroutine.yield();
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19 module:log("debug", "Now we have %d bytes, reading...", #data);
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20 return self:read_bytes(n_bytes);
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21 end
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22 module:log("debug", "Returning %d bytes (buffer: %d)", #data, #self.buffer);
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23 return data;
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24 end
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25
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26 function stream_mt:read_string()
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27 local len1, len2 = self:read_bytes(2):byte(1,2);
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28 local len = bit.lshift(len1, 8) + len2;
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29 return self:read_bytes(len), len+2;
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30 end
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31
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32 local packet_type_codes = {
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33 "connect", "connack",
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34 "publish", "puback", "pubrec", "pubrel", "pubcomp",
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35 "subscribe", "subak", "unsubscribe", "unsuback",
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36 "pingreq", "pingresp",
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37 "disconnect"
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38 };
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39
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40 function stream_mt:read_packet()
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41 local packet = {};
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42 local header = self:read_bytes(1):byte();
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43 packet.type = packet_type_codes[bit.rshift(bit.band(header, 0xf0), 4)];
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44 packet.dup = bit.band(header, 0x08) == 0x08;
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45 packet.qos = bit.rshift(bit.band(header, 0x06), 1);
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46 packet.retain = bit.band(header, 0x01) == 0x01;
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47
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48 -- Get length
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49 local length, multiplier = 0, 1;
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50 repeat
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51 local digit = self:read_bytes(1):byte();
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52 length = length + bit.band(digit, 0x7f)*multiplier;
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53 multiplier = multiplier*128;
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54 until bit.band(digit, 0x80) == 0;
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55 packet.length = length;
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56 if packet.type == "connect" then
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57 if self:read_string() ~= "MQIsdp" then
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58 module:log("warn", "Unexpected packet signature!");
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59 packet.type = nil; -- Invalid packet
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60 else
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61 packet.version = self:read_bytes(1):byte();
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62 packet.connect_flags = self:read_bytes(1):byte();
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63 packet.keepalive_timer = self:read_bytes(1):byte();
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64 length = length - 11;
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65 end
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66 elseif packet.type == "publish" then
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67 packet.topic = self:read_string();
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68 length = length - (#packet.topic+2);
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69 if packet.qos == 1 or packet.qos == 2 then
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70 packet.id = self:read_bytes(2);
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71 length = length - 2;
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72 end
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73 elseif packet.type == "subscribe" then
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74 if packet.qos == 1 or packet.qos == 2 then
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75 packet.id = self:read_bytes(2);
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76 length = length - 2;
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77 end
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78 local topics = {};
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79 while length > 0 do
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80 local topic, len = self:read_string();
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81 table.insert(topics, topic);
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82 self:read_bytes(1); -- QoS not used
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83 length = length - (len+1);
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84 end
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85 packet.topics = topics;
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86 end
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87 if length > 0 then
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88 packet.data = self:read_bytes(length);
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89 end
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90 return packet;
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91 end
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92
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93 local function new_parser(self)
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94 return coroutine.wrap(function (data)
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95 self.buffer = data;
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96 while true do
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97 data = coroutine.yield(self:read_packet());
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98 module:log("debug", "Parser: %d new bytes", #data);
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99 self.buffer = (self.buffer or "")..data;
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100 end
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101 end);
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102 end
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103
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104 function stream_mt:feed(data)
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105 module:log("debug", "Feeding %d bytes", #data);
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106 local packets = {};
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107 local packet = self.parser(data);
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108 while packet do
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109 module:log("debug", "Received packet");
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110 table.insert(packets, packet);
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111 packet = self.parser("");
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112 end
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113 module:log("debug", "Returning %d packets", #packets);
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114 return packets;
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115 end
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116
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117 local function new_stream()
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118 local stream = setmetatable({}, stream_mt);
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119 stream.parser = new_parser(stream);
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120 return stream;
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121 end
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122
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123 local function serialize_packet(packet)
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124 local type_num = 0;
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125 for i, v in ipairs(packet_type_codes) do -- FIXME: I'm so tired right now.
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126 if v == packet.type then
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127 type_num = i;
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128 break;
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129 end
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130 end
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131 local header = string.char(bit.lshift(type_num, 4));
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132
1240
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133 if packet.type == "publish" then
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134 local topic = packet.topic or "";
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135 packet.data = string.char(bit.band(#topic, 0xff00), bit.band(#topic, 0x00ff))..topic..packet.data;
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136 elseif packet.type == "suback" then
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137 local t = {};
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138 for _, topic in ipairs(packet.topics) do
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139 table.insert(t, string.char(bit.band(#topic, 0xff00), bit.band(#topic, 0x00ff))..topic.."\000");
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140 end
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141 packet.data = table.concat(t);
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142 end
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143
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144 -- Get length
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145 local length = #(packet.data or "");
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146 repeat
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147 local digit = length%128;
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148 length = math.floor(length/128);
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149 if length > 0 then
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150 digit = bit.bor(digit, 0x80);
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151 end
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152 header = header..string.char(digit); -- FIXME: ...
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153 until length <= 0;
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154
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155 return header..(packet.data or "");
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156 end
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157
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158 return {
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159 new_stream = new_stream;
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160 serialize_packet = serialize_packet;
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161 };