Annotate

mod_smacks/mod_smacks.lua @ 987:fabff75bfc3f

mod_smacks: If a hibernating session was destroyed before the timeout, don't destroy it again or say that it was resumed
author Kim Alvefur <zash@zash.se>
date Thu, 25 Apr 2013 17:34:30 +0200
parent 925:720b8268778e
child 988:c15cea87036f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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10 local datetime = require "util.datetime";
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11
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12 local xmlns_sm = "urn:xmpp:sm:2";
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13 local xmlns_errors = "urn:ietf:params:xml:ns:xmpp-stanzas";
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14 local xmlns_delay = "urn:xmpp:delay";
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16 local sm_attr = { xmlns = xmlns_sm };
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17
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18 local resume_timeout = module:get_option_number("smacks_hibernation_time", 300);
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19 local s2s_smacks = module:get_option_boolean("smacks_enabled_s2s", false);
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20 local max_unacked_stanzas = module:get_option_number("smacks_max_unacked_stanzas", 0);
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713c6791fbcc mod_smacks: Import prosody.core_process_stanza()
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21 local core_process_stanza = prosody.core_process_stanza;
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22 local sessionmanager = require"core.sessionmanager";
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23
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24 local c2s_sessions = module:shared("/*/c2s/sessions");
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25 local session_registry = {};
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26
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27 local function can_do_smacks(session, advertise_only)
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28 if session.smacks then return false, "unexpected-request", "Stream management is already enabled"; end
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30 local session_type = session.type;
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31 if session_type == "c2s" then
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32 if not(advertise_only) and not(session.resource) then -- Fail unless we're only advertising sm
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33 return false, "unexpected-request", "Client must bind a resource before enabling stream management";
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34 end
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35 return true;
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36 elseif s2s_smacks and (session_type == "s2sin" or session_type == "s2sout") then
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37 return true;
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38 end
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39 return false, "service-unavailable", "Stream management is not available for this stream";
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40 end
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41
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42 module:hook("stream-features",
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43 function (event)
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44 if can_do_smacks(event.origin, true) then
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45 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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46 end
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47 end);
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49 module:hook("s2s-stream-features",
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50 function (event)
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51 if can_do_smacks(event.origin, true) then
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52 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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53 end
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54 end);
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55
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56 module:hook_stanza("http://etherx.jabber.org/streams", "features",
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57 function (session, stanza)
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58 if can_do_smacks(session) and stanza:get_child("sm", xmlns_sm) then
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59 session.sends2s(st.stanza("enable", sm_attr));
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60 end
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61 end);
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62
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63 local function wrap_session(session, resume)
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64 -- Overwrite process_stanza() and send()
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65 local queue;
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66 if not resume then
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67 queue = {};
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68 session.outgoing_stanza_queue = queue;
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69 session.last_acknowledged_stanza = 0;
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70 else
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71 queue = session.outgoing_stanza_queue;
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72 end
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74 local _send = session.sends2s or session.send;
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75 local function new_send(stanza)
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76 local attr = stanza.attr;
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77 if attr and not attr.xmlns then -- Stanza in default stream namespace
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78 local cached_stanza = st.clone(stanza);
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79
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80 if cached_stanza and cached_stanza:get_child("delay", xmlns_delay) == nil then
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81 cached_stanza = cached_stanza:tag("delay", { xmlns = xmlns_delay, from = session.host, stamp = datetime.datetime()});
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82 end
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83
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84 queue[#queue+1] = cached_stanza;
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85 end
908
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86 if session.hibernating then
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87 -- The session is hibernating, no point in sending the stanza
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88 -- over a dead connection. It will be delivered upon resumption.
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89 return true;
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90 end
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91 local ok, err = _send(stanza);
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92 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack and attr and not attr.xmlns then
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93 session.awaiting_ack = true;
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94 return _send(st.stanza("r", sm_attr));
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95 end
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96 return ok, err;
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97 end
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98
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99 if session.sends2s then
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100 session.sends2s = new_send;
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101 else
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102 session.send = new_send;
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103 end
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104
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105 if not resume then
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106 session.handled_stanza_count = 0;
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107 add_filter(session, "stanzas/in", function (stanza)
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108 if not stanza.attr.xmlns then
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109 session.handled_stanza_count = session.handled_stanza_count + 1;
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110 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
255
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111 end
345
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112 return stanza;
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113 end);
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114 end
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115
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116 return session;
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117 end
201
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118
345
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119 module:hook_stanza(xmlns_sm, "enable", function (session, stanza)
591
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120 local ok, err, err_text = can_do_smacks(session);
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121 if not ok then
590
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122 session.log("warn", "Failed to enable smacks: %s", err_text); -- TODO: XEP doesn't say we can send error text, should it?
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123 session.send(st.stanza("failed", { xmlns = xmlns_sm }):tag(err, { xmlns = xmlns_errors}));
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124 return true;
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125 end
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126
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127 module:log("debug", "Enabling stream management");
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128 session.smacks = true;
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129
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130 wrap_session(session);
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131
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132 local resume_token;
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133 local resume = stanza.attr.resume;
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134 if resume == "true" or resume == "1" then
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135 resume_token = uuid_generate();
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136 session_registry[resume_token] = session;
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137 session.resumption_token = resume_token;
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138 end
576
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139 (session.sends2s or session.send)(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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140 return true;
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141 end, 100);
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142
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143 module:hook_stanza(xmlns_sm, "enabled", function (session, stanza)
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144 module:log("debug", "Enabling stream management");
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145 session.smacks = true;
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146
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147 wrap_session(session);
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148
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149 -- FIXME Resume?
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150
345
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151 return true;
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152 end, 100);
160
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153
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154 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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155 if not origin.smacks then
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156 module:log("debug", "Received ack request from non-smack-enabled session");
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157 return;
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158 end
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159 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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160 -- Reply with <a>
255
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161 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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162 return true;
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163 end);
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164
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165 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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166 if not origin.smacks then return; end
200
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167 origin.awaiting_ack = nil;
160
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168 -- Remove handled stanzas from outgoing_stanza_queue
258
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169 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
220
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170 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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171 local queue = origin.outgoing_stanza_queue;
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172 if handled_stanza_count > #queue then
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173 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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diff changeset
174 handled_stanza_count, #queue);
345
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175 module:log("debug", "Client h: %d, our h: %d", tonumber(stanza.attr.h), origin.last_acknowledged_stanza);
220
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176 for i=1,#queue do
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177 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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178 end
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diff changeset
179 end
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diff changeset
180 for i=1,math_min(handled_stanza_count,#queue) do
160
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181 t_remove(origin.outgoing_stanza_queue, 1);
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182 end
220
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diff changeset
183 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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184 return true;
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185 end);
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186
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187 --TODO: Optimise... incoming stanzas should be handled by a per-session
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188 -- function that has a counter as an upvalue (no table indexing for increments,
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189 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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190 -- on stanzas
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191
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192 function handle_unacked_stanzas(session)
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193 local queue = session.outgoing_stanza_queue;
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194 local error_attr = { type = "cancel" };
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195 if #queue > 0 then
202
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diff changeset
196 session.outgoing_stanza_queue = {};
160
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197 for i=1,#queue do
256
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diff changeset
198 local reply = st.reply(queue[i]);
160
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199 if reply.attr.to ~= session.full_jid then
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200 reply.attr.type = "error";
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201 reply:tag("error", error_attr)
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202 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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diff changeset
203 core_process_stanza(session, reply);
160
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204 end
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205 end
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206 end
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diff changeset
207 end
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parents:
diff changeset
208
622
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parents: 595
diff changeset
209 module:hook("pre-resource-unbind", function (event)
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parents: 595
diff changeset
210 local session, err = event.session, event.error;
891
e089160c424b mod_smacks: 'reason' parameter of session:close() changed to make nil and false mean 'graceful close' in 9da430b69f13
Kim Alvefur <zash@zash.se>
parents: 812
diff changeset
211 if session.smacks and err then
257
08fa42e1ab06 mod_smacks: Fixes for monkey-patched sessionmanager.destroy to handle stream resumption, and to fall back to stock destroy() if the session is not smacks-enabled.
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parents: 256
diff changeset
212 if not session.resumption_token then
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parents: 256
diff changeset
213 local queue = session.outgoing_stanza_queue;
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parents: 256
diff changeset
214 if #queue > 0 then
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parents: 256
diff changeset
215 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
08fa42e1ab06 mod_smacks: Fixes for monkey-patched sessionmanager.destroy to handle stream resumption, and to fall back to stock destroy() if the session is not smacks-enabled.
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parents: 256
diff changeset
216 for i=1,#queue do
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parents: 256
diff changeset
217 module:log("warn", "::%s", tostring(queue[i]));
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parents: 256
diff changeset
218 end
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parents: 256
diff changeset
219 handle_unacked_stanzas(session);
160
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
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parents:
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220 end
257
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parents: 256
diff changeset
221 else
586
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diff changeset
222 session.log("debug", "mod_smacks hibernating session for up to %d seconds", resume_timeout);
345
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223 local hibernate_time = os_time(); -- Track the time we went into hibernation
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224 session.hibernating = hibernate_time;
478
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parents: 345
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225 local resumption_token = session.resumption_token;
257
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parents: 256
diff changeset
226 timer.add_task(resume_timeout, function ()
586
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parents: 576
diff changeset
227 session.log("debug", "mod_smacks hibernation timeout reached...");
478
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parents: 345
diff changeset
228 -- We need to check the current resumption token for this resource
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parents: 345
diff changeset
229 -- matches the smacks session this timer is for in case it changed
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parents: 345
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230 -- (for example, the client may have bound a new resource and
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parents: 345
diff changeset
231 -- started a new smacks session, or not be using smacks)
810
464ed063a8f2 mod_smacks: Less table indexing!
Kim Alvefur <zash@zash.se>
parents: 757
diff changeset
232 local curr_session = full_sessions[session.full_jid];
987
fabff75bfc3f mod_smacks: If a hibernating session was destroyed before the timeout, don't destroy it again or say that it was resumed
Kim Alvefur <zash@zash.se>
parents: 925
diff changeset
233 if false and session.destroyed then
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parents: 925
diff changeset
234 session.log("debug", "The session has already been destroyed");
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parents: 925
diff changeset
235 elseif curr_session and curr_session.resumption_token == resumption_token
345
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parents: 263
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236 -- Check the hibernate time still matches what we think it is,
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diff changeset
237 -- otherwise the session resumed and re-hibernated.
478
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Matthew Wild <mwild1@gmail.com>
parents: 345
diff changeset
238 and session.hibernating == hibernate_time then
586
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parents: 576
diff changeset
239 session.log("debug", "Destroying session for hibernating too long");
345
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parents: 263
diff changeset
240 session_registry[session.resumption_token] = nil;
257
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parents: 256
diff changeset
241 session.resumption_token = nil;
345
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parents: 263
diff changeset
242 sessionmanager.destroy_session(session);
586
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parents: 576
diff changeset
243 else
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parents: 576
diff changeset
244 session.log("debug", "Session resumed before hibernation timeout, all is well")
257
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parents: 256
diff changeset
245 end
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parents: 256
diff changeset
246 end);
622
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parents: 595
diff changeset
247 return true; -- Postpone destruction for now
160
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parents:
diff changeset
248 end
258
36648205b10a mod_smacks: Add commented log statement for future debugging
Matthew Wild <mwild1@gmail.com>
parents: 257
diff changeset
249
160
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parents:
diff changeset
250 end
622
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diff changeset
251 end);
345
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parents: 263
diff changeset
252
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parents: 263
diff changeset
253 module:hook_stanza(xmlns_sm, "resume", function (session, stanza)
925
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parents: 908
diff changeset
254 if session.full_jid then
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parents: 908
diff changeset
255 session.log("debug", "Tried to resume after resource binding");
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parents: 908
diff changeset
256 session.send(st.stanza("failed", sm_attr)
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parents: 908
diff changeset
257 :tag("unexpected-request", { xmlns = xmlns_errors })
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parents: 908
diff changeset
258 );
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parents: 908
diff changeset
259 return true;
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parents: 908
diff changeset
260 end
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Kim Alvefur <zash@zash.se>
parents: 908
diff changeset
261
345
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parents: 263
diff changeset
262 local id = stanza.attr.previd;
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parents: 263
diff changeset
263 local original_session = session_registry[id];
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parents: 263
diff changeset
264 if not original_session then
588
8042558336b6 mod_smacks: Log message when client tries to resume unknown session
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parents: 587
diff changeset
265 session.log("debug", "Tried to resume non-existent session with id %s", id);
345
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parents: 263
diff changeset
266 session.send(st.stanza("failed", sm_attr)
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parents: 263
diff changeset
267 :tag("item-not-found", { xmlns = xmlns_errors })
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parents: 263
diff changeset
268 );
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parents: 263
diff changeset
269 elseif session.username == original_session.username
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parents: 263
diff changeset
270 and session.host == original_session.host then
587
322a14acd974 mod_smacks: Add log message on resume
Matthew Wild <mwild1@gmail.com>
parents: 586
diff changeset
271 session.log("debug", "mod_smacks resuming existing session...");
345
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parents: 263
diff changeset
272 -- TODO: All this should move to sessionmanager (e.g. session:replace(new_session))
623
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
Matthew Wild <mwild1@gmail.com>
parents: 622
diff changeset
273 if original_session.conn then
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
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parents: 622
diff changeset
274 session.log("debug", "mod_smacks closing an old connection for this session");
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
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parents: 622
diff changeset
275 local conn = original_session.conn;
640
d87131b29bbd mod_smacks: Remove dependency on connlisteners (use sessions table shared by mod_c2s directly)
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parents: 625
diff changeset
276 c2s_sessions[conn] = nil;
623
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
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parents: 622
diff changeset
277 conn:close();
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parents: 622
diff changeset
278 end
345
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parents: 263
diff changeset
279 original_session.ip = session.ip;
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parents: 263
diff changeset
280 original_session.conn = session.conn;
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parents: 263
diff changeset
281 original_session.send = session.send;
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
282 original_session.stream = session.stream;
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parents: 263
diff changeset
283 original_session.secure = session.secure;
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
284 original_session.hibernating = nil;
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
285 local filter = original_session.filter;
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parents: 263
diff changeset
286 local stream = session.stream;
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parents: 263
diff changeset
287 local log = session.log;
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parents: 263
diff changeset
288 function original_session.data(data)
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parents: 263
diff changeset
289 data = filter("bytes/in", data);
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
290 if data then
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parents: 263
diff changeset
291 local ok, err = stream:feed(data);
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
292 if ok then return; end
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parents: 263
diff changeset
293 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
294 original_session:close("xml-not-well-formed");
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parents: 263
diff changeset
295 end
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parents: 263
diff changeset
296 end
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parents: 263
diff changeset
297 wrap_session(original_session, true);
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
298 -- Inform xmppstream of the new session (passed to its callbacks)
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parents: 263
diff changeset
299 stream:set_session(original_session);
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parents: 263
diff changeset
300 -- Similar for connlisteners
640
d87131b29bbd mod_smacks: Remove dependency on connlisteners (use sessions table shared by mod_c2s directly)
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parents: 625
diff changeset
301 c2s_sessions[session.conn] = original_session;
345
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parents: 263
diff changeset
302
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
303 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
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parents: 263
diff changeset
304 h = original_session.handled_stanza_count, previd = id }));
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parents: 263
diff changeset
305
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parents: 263
diff changeset
306 -- Fake an <a> with the h of the <resume/> from the client
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parents: 263
diff changeset
307 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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parents: 263
diff changeset
308 h = stanza.attr.h }));
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
309
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
310 -- Ok, we need to re-send any stanzas that the client didn't see
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diff changeset
311 -- ...they are what is now left in the outgoing stanza queue
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312 local queue = original_session.outgoing_stanza_queue;
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313 for i=1,#queue do
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314 session.send(queue[i]);
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315 end
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316 else
755
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317 module:log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
345
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318 session.username or "?", session.host or "?", session.type,
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319 original_session.username or "?", original_session.host or "?", original_session.type);
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320 session.send(st.stanza("failed", sm_attr)
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321 :tag("not-authorized", { xmlns = xmlns_errors }));
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322 end
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323 return true;
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324 end);