prosody
6f54dac3ec2d
plugins/mod_compression.lua

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plugins/mod_compression.lua @ 2282:6f54dac3ec2d

mod_compression: Prepare activating of compression on s2s.
author Tobias Markmann <tm@ayena.de>
date Sun, 29 Nov 2009 22:02:21 +0100
parent 2280:0b0fe49e5251
child 2283:156bb00ba5c0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2009 Tobias Markmann
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7
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8 local st = require "util.stanza";
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9 local zlib = require "zlib";
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10 local pcall = pcall;
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11 local xmlns_compression_feature = "http://jabber.org/features/compress"
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12 local xmlns_compression_protocol = "http://jabber.org/protocol/compress"
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13 local xmlns_stream = "http://etherx.jabber.org/streams";
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14 local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up();
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15
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16 local compression_level = module:get_option("compression_level");
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17 -- if not defined assume admin wants best compression
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18 if compression_level == nil then compression_level = 9 end;
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19
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20
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21 compression_level = tonumber(compression_level);
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22 if not compression_level or compression_level < 1 or compression_level > 9 then
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23 module:log("warn", "Invalid compression level in config: %s", tostring(compression_level));
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24 module:log("warn", "Module loading aborted. Compression won't be available.");
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25 return;
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26 end
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27
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28 module:add_event_hook("stream-features",
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29 function (session, features)
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30 if not session.compressed then
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31 -- FIXME only advertise compression support when TLS layer has no compression enabled
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32 features:add_child(compression_stream_feature);
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33 end
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34 end
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35 );
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36
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37 module:hook("s2s-stream-features",
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38 function (data)
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39 local session, features = data.session, data.features;
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40 -- FIXME only advertise compression support when TLS layer has no compression enabled
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41 features:add_child(compression_stream_feature);
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42 end
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43 );
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44
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45 -- S2Sout handling aka the client perspective in the S2S connection
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46 module:hook_stanza(xmlns_stream, "features",
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47 function (session, stanza)
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48 if not session.compressed then
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49 module:log("debug", "FEATURES: "..stanza:pretty_print())
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50 -- does remote server support compression?
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51 local comp_st = stanza:child_with_name("compression");
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52 if comp_st then
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53 -- do we support the mechanism
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54 for a in comp_st:children() do
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55 local algorithm = a[1]
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56 if algorithm == "zlib" then
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57 session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib"))
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58 session.log("info", "Enabled compression using zlib.")
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59 return true;
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60 end
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61 end
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62 session.log("debug", "Remote server supports no compression algorithm we support.")
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63 end
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64 end
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65 end
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66 , 250);
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67
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68 -- TODO Support compression on S2S level too.
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69 module:add_handler({"s2sout_unauthed", "s2sout"}, "compressed", xmlns_compression_protocol,
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70 function(session ,stanza)
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71 session.log("debug", "Activating compression...")
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72 end
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73 );
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74
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75 module:add_handler({"c2s_unauthed", "c2s", "s2sin_unauthed", "s2sin"}, "compress", xmlns_compression_protocol,
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76 function(session, stanza)
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77 -- fail if we are already compressed
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78 if session.compressed then
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79 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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80 session.send(error_st);
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81 session.log("warn", "Tried to establish another compression layer.");
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82 end
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83
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84 -- checking if the compression method is supported
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85 local method = stanza:child_with_name("method")[1];
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86 if method == "zlib" then
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87 session.log("info", method.." compression selected.");
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88 (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol}));
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89 session:reset_stream();
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90
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91 -- create deflate and inflate streams
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92 local status, deflate_stream = pcall(zlib.deflate, compression_level);
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93 if status == false then
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94 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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95 (session.sends2s or session.send)(error_st);
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96 session.log("error", "Failed to create zlib.deflate filter.");
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97 module:log("error", deflate_stream);
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98 return
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99 end
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100
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101 local status, inflate_stream = pcall(zlib.inflate);
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102 if status == false then
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103 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed");
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104 (session.sends2s or session.send)(error_st);
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105 session.log("error", "Failed to create zlib.deflate filter.");
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106 module:log("error", inflate_stream);
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107 return
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108 end
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109
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110 -- setup compression for session.w
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111 local old_send = session.send;
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112
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113 session.send = function(t)
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114 local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync');
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115 if status == false then
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116 session:close({
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117 condition = "undefined-condition";
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118 text = compressed;
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119 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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120 });
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121 module:log("warn", compressed);
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122 return;
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123 end
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124 old_send(compressed);
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125 end;
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126
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127 -- setup decompression for session.data
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128 local function setup_decompression(session)
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129 local old_data = session.data
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130 session.data = function(conn, data)
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131 local status, decompressed, eof = pcall(inflate_stream, data);
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132 if status == false then
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133 session:close({
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134 condition = "undefined-condition";
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135 text = decompressed;
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136 extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed");
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137 });
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138 module:log("warn", decompressed);
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139 return;
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140 end
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141 old_data(conn, decompressed);
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142 end;
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143 end
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144 setup_decompression(session);
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145
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146 local session_reset_stream = session.reset_stream;
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147 session.reset_stream = function(session)
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148 session_reset_stream(session);
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149 setup_decompression(session);
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150 return true;
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151 end;
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152 session.compressed = true;
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153 else
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154 session.log("info", method.." compression selected. But we don't support it.");
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155 local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method");
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156 (session.sends2s or session.send)(error_st);
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157 end
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158 end
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159 );
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160