prosody-modules
05fa54404012
mod_pubsub_mqtt/mqtt.lib.lua

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mod_pubsub_mqtt/mqtt.lib.lua @ 1539:05fa54404012

mod_smacks: Send ack requests by serializing and concatenating them to outgoing stanzas, using a timer might cause high CPU usage
author Kim Alvefur <zash@zash.se>
date Tue, 28 Oct 2014 22:26:41 +0100
parent 1343:7dbde05b48a9
child 5114:d2a84e6aed2b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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 };