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annotate mod_smacks/mod_smacks.lua @ 589:57ac609444c4

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mod_smacks: Only advertise stream features when a stream is authenticated, and doesn't already have smacks enabled
author Matthew Wild <mwild1@gmail.com>
date Wed, 01 Feb 2012 23:27:23 +0000
parents 8042558336b6
children 40b707d7a809
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1 local st = require "util.stanza";
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2 local uuid_generate = require "util.uuid".generate;
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4 local t_insert, t_remove = table.insert, table.remove;
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5 local math_min = math.min;
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6 local os_time = os.time;
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7 local tonumber, tostring = tonumber, tostring;
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8 local add_filter = require "util.filters".add_filter;
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9 local timer = require "util.timer";
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11 local xmlns_sm = "urn:xmpp:sm:2";
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12 local xmlns_errors = "urn:ietf:params:xml:ns:xmpp-stanzas";
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14 local sm_attr = { xmlns = xmlns_sm };
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15
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16 local resume_timeout = module:get_option("smacks_hibernation_time", 300);
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17 local s2s_smacks = module:get_option_boolean("smacks_enabled_s2s", false);
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18 local max_unacked_stanzas = 0;
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19
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20 local session_registry = {};
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21
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22 module:hook("stream-features",
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23 function (event)
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24 local origin = event.origin;
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25 if not(origin.smacks) and origin.type == "c2s" then
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26 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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27 end
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28 end);
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30 module:hook("s2s-stream-features",
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31 function (event)
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32 local origin = event.origin;
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33 if s2s_smacks and not(origin.smacks) and (origin.type == "s2sin" or origin.type == "s2sout") then
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34 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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35 end
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36 end);
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37
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38 module:hook_stanza("http://etherx.jabber.org/streams", "features",
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39 function (session, stanza)
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40 if s2s_smacks and (session.type == "s2sin" or session.type == "s2sout")
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41 and not session.smacks and stanza:get_child("sm", xmlns_sm) then
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42 session.sends2s(st.stanza("enable", sm_attr));
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43 end
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44 end);
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46 local function wrap_session(session, resume)
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47 -- Overwrite process_stanza() and send()
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48 local queue;
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49 if not resume then
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50 queue = {};
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51 session.outgoing_stanza_queue = queue;
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52 session.last_acknowledged_stanza = 0;
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53 else
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54 queue = session.outgoing_stanza_queue;
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55 end
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56
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57 local _send = session.sends2s or session.send;
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58 local function new_send(stanza)
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59 local attr = stanza.attr;
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60 if attr and not attr.xmlns then -- Stanza in default stream namespace
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61 queue[#queue+1] = st.clone(stanza);
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62 end
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63 local ok, err = _send(stanza);
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64 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack then
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65 session.awaiting_ack = true;
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66 return _send(st.stanza("r", sm_attr));
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67 end
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68 return ok, err;
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69 end
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71 if session.sends2s then
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72 session.sends2s = new_send;
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73 else
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74 session.send = new_send;
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75 end
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76
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77 if not resume then
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78 session.handled_stanza_count = 0;
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79 add_filter(session, "stanzas/in", function (stanza)
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80 if not stanza.attr.xmlns then
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81 session.handled_stanza_count = session.handled_stanza_count + 1;
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82 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
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83 end
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84 return stanza;
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85 end);
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86 end
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87
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88 return session;
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89 end
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90
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91 module:hook_stanza(xmlns_sm, "enable", function (session, stanza)
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92 module:log("debug", "Enabling stream management");
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93 session.smacks = true;
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94
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95 wrap_session(session);
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96
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97 local resume_token;
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98 local resume = stanza.attr.resume;
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99 if resume == "true" or resume == "1" then
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100 resume_token = uuid_generate();
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101 session_registry[resume_token] = session;
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102 session.resumption_token = resume_token;
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103 end
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104 (session.sends2s or session.send)(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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105 return true;
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106 end, 100);
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107
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108 module:hook_stanza(xmlns_sm, "enabled", function (session, stanza)
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109 module:log("debug", "Enabling stream management");
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110 session.smacks = true;
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111
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112 wrap_session(session);
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113
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114 -- FIXME Resume?
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115
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116 return true;
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117 end, 100);
160
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118
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119 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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120 if not origin.smacks then
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121 module:log("debug", "Received ack request from non-smack-enabled session");
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122 return;
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123 end
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124 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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125 -- Reply with <a>
255
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126 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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127 return true;
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128 end);
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129
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130 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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131 if not origin.smacks then return; end
200
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132 origin.awaiting_ack = nil;
160
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133 -- Remove handled stanzas from outgoing_stanza_queue
258
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134 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
220
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135 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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136 local queue = origin.outgoing_stanza_queue;
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137 if handled_stanza_count > #queue then
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138 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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139 handled_stanza_count, #queue);
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140 module:log("debug", "Client h: %d, our h: %d", tonumber(stanza.attr.h), origin.last_acknowledged_stanza);
220
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141 for i=1,#queue do
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142 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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143 end
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144 end
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145 for i=1,math_min(handled_stanza_count,#queue) do
160
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146 t_remove(origin.outgoing_stanza_queue, 1);
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147 end
220
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148 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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149 return true;
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150 end);
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151
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152 --TODO: Optimise... incoming stanzas should be handled by a per-session
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153 -- function that has a counter as an upvalue (no table indexing for increments,
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154 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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155 -- on stanzas
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156
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157 function handle_unacked_stanzas(session)
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158 local queue = session.outgoing_stanza_queue;
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159 local error_attr = { type = "cancel" };
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160 if #queue > 0 then
202
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161 session.outgoing_stanza_queue = {};
160
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162 for i=1,#queue do
256
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163 local reply = st.reply(queue[i]);
160
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164 if reply.attr.to ~= session.full_jid then
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165 reply.attr.type = "error";
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166 reply:tag("error", error_attr)
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167 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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diff changeset
168 core_process_stanza(session, reply);
160
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169 end
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170 end
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171 end
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172 end
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173
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174 local _destroy_session = sessionmanager.destroy_session;
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175 function sessionmanager.destroy_session(session, err)
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176 if session.smacks then
257
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177 if not session.resumption_token then
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178 local queue = session.outgoing_stanza_queue;
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179 if #queue > 0 then
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180 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
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181 for i=1,#queue do
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182 module:log("warn", "::%s", tostring(queue[i]));
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183 end
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184 handle_unacked_stanzas(session);
160
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185 end
257
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diff changeset
186 else
586
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diff changeset
187 session.log("debug", "mod_smacks hibernating session for up to %d seconds", resume_timeout);
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188 local hibernate_time = os_time(); -- Track the time we went into hibernation
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189 session.hibernating = hibernate_time;
478
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190 local resumption_token = session.resumption_token;
257
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191 timer.add_task(resume_timeout, function ()
586
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192 session.log("debug", "mod_smacks hibernation timeout reached...");
478
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193 -- We need to check the current resumption token for this resource
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194 -- matches the smacks session this timer is for in case it changed
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195 -- (for example, the client may have bound a new resource and
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196 -- started a new smacks session, or not be using smacks)
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197 local curr_session = hosts[session.host].sessions[session.username].sessions[session.resource];
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198 if curr_session.resumption_token == resumption_token
345
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199 -- Check the hibernate time still matches what we think it is,
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200 -- otherwise the session resumed and re-hibernated.
478
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diff changeset
201 and session.hibernating == hibernate_time then
586
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diff changeset
202 session.log("debug", "Destroying session for hibernating too long");
345
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diff changeset
203 session_registry[session.resumption_token] = nil;
257
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diff changeset
204 session.resumption_token = nil;
345
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diff changeset
205 -- This recursion back into our destroy handler is to
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diff changeset
206 -- make sure we still handle any queued stanzas
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diff changeset
207 sessionmanager.destroy_session(session);
586
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diff changeset
208 else
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diff changeset
209 session.log("debug", "Session resumed before hibernation timeout, all is well")
257
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210 end
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211 end);
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212 return; -- Postpone destruction for now
160
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213 end
258
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214
160
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215 end
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216 return _destroy_session(session, err);
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217 end
345
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218
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219 module:hook_stanza(xmlns_sm, "resume", function (session, stanza)
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220 local id = stanza.attr.previd;
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221 local original_session = session_registry[id];
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222 if not original_session then
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223 session.log("debug", "Tried to resume non-existent session with id %s", id);
345
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224 session.send(st.stanza("failed", sm_attr)
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225 :tag("item-not-found", { xmlns = xmlns_errors })
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226 );
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227 elseif session.username == original_session.username
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228 and session.host == original_session.host then
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229 session.log("debug", "mod_smacks resuming existing session...");
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230 -- TODO: All this should move to sessionmanager (e.g. session:replace(new_session))
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231 original_session.ip = session.ip;
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232 original_session.conn = session.conn;
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233 original_session.send = session.send;
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234 original_session.stream = session.stream;
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235 original_session.secure = session.secure;
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236 original_session.hibernating = nil;
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237 local filter = original_session.filter;
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238 local stream = session.stream;
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239 local log = session.log;
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240 function original_session.data(data)
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241 data = filter("bytes/in", data);
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242 if data then
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243 local ok, err = stream:feed(data);
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244 if ok then return; end
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245 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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246 original_session:close("xml-not-well-formed");
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247 end
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248 end
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249 wrap_session(original_session, true);
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250 -- Inform xmppstream of the new session (passed to its callbacks)
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251 stream:set_session(original_session);
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252 -- Similar for connlisteners
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253 require "net.connlisteners".get("xmppclient").associate_session(session.conn, original_session);
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254
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255 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
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256 h = original_session.handled_stanza_count, previd = id }));
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257
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258 -- Fake an <a> with the h of the <resume/> from the client
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259 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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260 h = stanza.attr.h }));
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261
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262 -- Ok, we need to re-send any stanzas that the client didn't see
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263 -- ...they are what is now left in the outgoing stanza queue
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264 local queue = original_session.outgoing_stanza_queue;
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265 for i=1,#queue do
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266 session.send(queue[i]);
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267 end
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268 else
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269 log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
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270 session.username or "?", session.host or "?", session.type,
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271 original_session.username or "?", original_session.host or "?", original_session.type);
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272 session.send(st.stanza("failed", sm_attr)
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273 :tag("not-authorized", { xmlns = xmlns_errors }));
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274 end
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275 return true;
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276 end);