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annotate mod_smacks/mod_smacks.lua @ 345:445178d15b51

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mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
author Matthew Wild <mwild1@gmail.com>
date Fri, 18 Mar 2011 21:26:27 +0000
parents 41f1cac40560
children db0f065c4e09
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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 max_unacked_stanzas = 0;
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18
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19 local session_registry = {};
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20
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21 module:hook("stream-features",
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22 function (event)
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23 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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24 end);
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26 module:hook("s2s-stream-features",
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27 function (event)
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28 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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29 end);
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30
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31 module:hook_stanza("http://etherx.jabber.org/streams", "features",
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32 function (session, stanza)
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33 if not session.smacks and stanza:get_child("sm", xmlns_sm) then
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34 session.send(st.stanza("enable", sm_attr));
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35 end
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36 end);
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37
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38 local function wrap_session(session, resume)
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39 -- Overwrite process_stanza() and send()
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40 local queue;
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41 if not resume then
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42 queue = {};
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43 session.outgoing_stanza_queue = queue;
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44 session.last_acknowledged_stanza = 0;
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45 else
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46 queue = session.outgoing_stanza_queue;
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47 end
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49 local _send = session.sends2s or session.send;
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50 local function new_send(stanza)
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51 local attr = stanza.attr;
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52 if attr and not attr.xmlns then -- Stanza in default stream namespace
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53 queue[#queue+1] = st.clone(stanza);
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54 end
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55 local ok, err = _send(stanza);
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56 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack then
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57 session.awaiting_ack = true;
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58 return _send(st.stanza("r", sm_attr));
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59 end
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60 return ok, err;
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61 end
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62
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63 if session.sends2s then
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64 session.sends2s = new_send;
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65 else
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66 session.send = new_send;
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67 end
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68
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69 if not resume then
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70 session.handled_stanza_count = 0;
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71 add_filter(session, "stanzas/in", function (stanza)
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72 if not stanza.attr.xmlns then
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73 session.handled_stanza_count = session.handled_stanza_count + 1;
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74 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
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75 end
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76 return stanza;
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77 end);
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78 end
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79
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80 return session;
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81 end
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82
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83 module:hook_stanza(xmlns_sm, "enable", function (session, stanza)
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84 module:log("debug", "Enabling stream management");
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85 session.smacks = true;
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86
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87 wrap_session(session);
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88
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89 local resume_token;
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90 local resume = stanza.attr.resume;
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91 if resume == "true" or resume == "1" then
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92 resume_token = uuid_generate();
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93 session_registry[resume_token] = session;
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94 session.resumption_token = resume_token;
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95 end
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96 session.send(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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97 return true;
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98 end, 100);
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99
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100 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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101 if not origin.smacks then
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102 module:log("debug", "Received ack request from non-smack-enabled session");
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103 return;
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104 end
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105 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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106 -- Reply with <a>
255
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107 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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108 return true;
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109 end);
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110
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111 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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112 if not origin.smacks then return; end
200
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113 origin.awaiting_ack = nil;
160
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114 -- Remove handled stanzas from outgoing_stanza_queue
258
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115 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
220
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116 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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117 local queue = origin.outgoing_stanza_queue;
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118 if handled_stanza_count > #queue then
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119 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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120 handled_stanza_count, #queue);
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121 module:log("debug", "Client h: %d, our h: %d", tonumber(stanza.attr.h), origin.last_acknowledged_stanza);
220
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122 for i=1,#queue do
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123 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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124 end
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125 end
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126 for i=1,math_min(handled_stanza_count,#queue) do
160
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127 t_remove(origin.outgoing_stanza_queue, 1);
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128 end
220
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129 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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130 return true;
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131 end);
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132
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133 --TODO: Optimise... incoming stanzas should be handled by a per-session
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134 -- function that has a counter as an upvalue (no table indexing for increments,
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135 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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136 -- on stanzas
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137
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138 function handle_unacked_stanzas(session)
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139 local queue = session.outgoing_stanza_queue;
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140 local error_attr = { type = "cancel" };
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141 if #queue > 0 then
202
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142 session.outgoing_stanza_queue = {};
160
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143 for i=1,#queue do
256
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144 local reply = st.reply(queue[i]);
160
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145 if reply.attr.to ~= session.full_jid then
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146 reply.attr.type = "error";
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147 reply:tag("error", error_attr)
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148 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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149 core_process_stanza(session, reply);
160
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150 end
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151 end
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152 end
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153 end
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154
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155 local _destroy_session = sessionmanager.destroy_session;
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156 function sessionmanager.destroy_session(session, err)
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157 if session.smacks then
257
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158 if not session.resumption_token then
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159 local queue = session.outgoing_stanza_queue;
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160 if #queue > 0 then
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161 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
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162 for i=1,#queue do
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163 module:log("warn", "::%s", tostring(queue[i]));
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164 end
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165 handle_unacked_stanzas(session);
160
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166 end
257
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167 else
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168 local hibernate_time = os_time(); -- Track the time we went into hibernation
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169 session.hibernating = hibernate_time;
257
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170 timer.add_task(resume_timeout, function ()
345
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171 -- Check the hibernate time still matches what we think it is,
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172 -- otherwise the session resumed and re-hibernated.
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173 if session.hibernating == hibernate_time then
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174 session_registry[session.resumption_token] = nil;
257
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175 session.resumption_token = nil;
345
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176 -- This recursion back into our destroy handler is to
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177 -- make sure we still handle any queued stanzas
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178 sessionmanager.destroy_session(session);
257
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179 end
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180 end);
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181 return; -- Postpone destruction for now
160
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182 end
258
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183
160
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184 end
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185 return _destroy_session(session, err);
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186 end
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187
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188 module:hook_stanza(xmlns_sm, "resume", function (session, stanza)
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189 local id = stanza.attr.previd;
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190 local original_session = session_registry[id];
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191 if not original_session then
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192 session.send(st.stanza("failed", sm_attr)
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193 :tag("item-not-found", { xmlns = xmlns_errors })
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194 );
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195 elseif session.username == original_session.username
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196 and session.host == original_session.host then
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197 -- TODO: All this should move to sessionmanager (e.g. session:replace(new_session))
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198 original_session.ip = session.ip;
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199 original_session.conn = session.conn;
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200 original_session.send = session.send;
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201 original_session.stream = session.stream;
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202 original_session.secure = session.secure;
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203 original_session.hibernating = nil;
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204 local filter = original_session.filter;
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205 local stream = session.stream;
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206 local log = session.log;
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207 function original_session.data(data)
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208 data = filter("bytes/in", data);
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209 if data then
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210 local ok, err = stream:feed(data);
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211 if ok then return; end
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212 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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213 original_session:close("xml-not-well-formed");
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214 end
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215 end
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216 wrap_session(original_session, true);
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217 -- Inform xmppstream of the new session (passed to its callbacks)
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218 stream:set_session(original_session);
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219 -- Similar for connlisteners
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220 require "net.connlisteners".get("xmppclient").associate_session(session.conn, original_session);
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221
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222 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
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223 h = original_session.handled_stanza_count, previd = id }));
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224
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225 -- Fake an <a> with the h of the <resume/> from the client
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226 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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227 h = stanza.attr.h }));
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228
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229 -- Ok, we need to re-send any stanzas that the client didn't see
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230 -- ...they are what is now left in the outgoing stanza queue
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231 local queue = original_session.outgoing_stanza_queue;
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232 for i=1,#queue do
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233 session.send(queue[i]);
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234 end
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235 else
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236 log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
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237 session.username or "?", session.host or "?", session.type,
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238 original_session.username or "?", original_session.host or "?", original_session.type);
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239 session.send(st.stanza("failed", sm_attr)
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240 :tag("not-authorized", { xmlns = xmlns_errors }));
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241 end
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242 return true;
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243 end);