annotate mod_smacks/mod_smacks.lua @ 737:e4ea03b060ed

mod_archive: switch from/to The XEP-0136 is not very explicit about the meening of <from> and <to> elements, but the examples are clear: <from> means it comes from the user in the 'with' attribute of the collection. That is the opposite of what is currently implemented in that module. So for better compatibility with complient clients, this switch the 'from' and 'to' fields
author Olivier Goffart <ogoffart@woboq.com>
date Wed, 04 Jul 2012 14:08:43 +0200
parents 842a8a3b0d81
children 713c6791fbcc
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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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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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21
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22 local c2s_sessions = module:shared("/*/c2s/sessions");
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23 local session_registry = {};
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25 local function can_do_smacks(session, advertise_only)
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26 if session.smacks then return false, "unexpected-request", "Stream management is already enabled"; end
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28 local session_type = session.type;
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29 if session_type == "c2s" then
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30 if not(advertise_only) and not(session.resource) then -- Fail unless we're only advertising sm
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31 return false, "unexpected-request", "Client must bind a resource before enabling stream management";
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32 end
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33 return true;
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34 elseif s2s_smacks and (session_type == "s2sin" or session_type == "s2sout") then
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35 return true;
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36 end
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37 return false, "service-unavailable", "Stream management is not available for this stream";
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38 end
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39
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40 module:hook("stream-features",
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41 function (event)
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42 if can_do_smacks(event.origin, true) then
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43 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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44 end
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45 end);
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47 module:hook("s2s-stream-features",
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48 function (event)
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49 if can_do_smacks(event.origin, true) then
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50 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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51 end
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52 end);
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53
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54 module:hook_stanza("http://etherx.jabber.org/streams", "features",
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55 function (session, stanza)
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56 if can_do_smacks(session) and stanza:get_child("sm", xmlns_sm) then
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57 session.sends2s(st.stanza("enable", sm_attr));
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58 end
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59 end);
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61 local function wrap_session(session, resume)
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62 -- Overwrite process_stanza() and send()
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63 local queue;
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64 if not resume then
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65 queue = {};
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66 session.outgoing_stanza_queue = queue;
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67 session.last_acknowledged_stanza = 0;
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68 else
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69 queue = session.outgoing_stanza_queue;
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70 end
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72 local _send = session.sends2s or session.send;
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73 local function new_send(stanza)
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74 local attr = stanza.attr;
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75 if attr and not attr.xmlns then -- Stanza in default stream namespace
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76 local cached_stanza = st.clone(stanza);
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78 if cached_stanza and cached_stanza:get_child("delay", xmlns_delay) == nil then
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79 cached_stanza = cached_stanza:tag("delay", { xmlns = xmlns_delay, from = session.host, stamp = datetime.datetime()});
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80 end
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81
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82 queue[#queue+1] = cached_stanza;
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83 end
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84 local ok, err = _send(stanza);
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85 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack then
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86 session.awaiting_ack = true;
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87 return _send(st.stanza("r", sm_attr));
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88 end
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89 return ok, err;
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90 end
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91
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92 if session.sends2s then
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93 session.sends2s = new_send;
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94 else
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95 session.send = new_send;
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96 end
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97
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98 if not resume then
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99 session.handled_stanza_count = 0;
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100 add_filter(session, "stanzas/in", function (stanza)
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101 if not stanza.attr.xmlns then
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102 session.handled_stanza_count = session.handled_stanza_count + 1;
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103 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
255
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104 end
345
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105 return stanza;
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106 end);
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107 end
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108
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109 return session;
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110 end
201
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111
345
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112 module:hook_stanza(xmlns_sm, "enable", function (session, stanza)
591
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113 local ok, err, err_text = can_do_smacks(session);
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114 if not ok then
590
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115 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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116 session.send(st.stanza("failed", { xmlns = xmlns_sm }):tag(err, { xmlns = xmlns_errors}));
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117 return true;
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118 end
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119
345
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120 module:log("debug", "Enabling stream management");
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121 session.smacks = true;
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122
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123 wrap_session(session);
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124
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125 local resume_token;
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126 local resume = stanza.attr.resume;
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127 if resume == "true" or resume == "1" then
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128 resume_token = uuid_generate();
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129 session_registry[resume_token] = session;
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130 session.resumption_token = resume_token;
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131 end
576
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132 (session.sends2s or session.send)(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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133 return true;
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134 end, 100);
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135
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136 module:hook_stanza(xmlns_sm, "enabled", function (session, stanza)
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137 module:log("debug", "Enabling stream management");
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138 session.smacks = true;
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139
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140 wrap_session(session);
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141
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142 -- FIXME Resume?
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143
345
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144 return true;
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145 end, 100);
160
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146
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147 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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148 if not origin.smacks then
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149 module:log("debug", "Received ack request from non-smack-enabled session");
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150 return;
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151 end
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152 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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153 -- Reply with <a>
255
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diff changeset
154 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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155 return true;
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156 end);
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157
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158 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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159 if not origin.smacks then return; end
200
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diff changeset
160 origin.awaiting_ack = nil;
160
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161 -- Remove handled stanzas from outgoing_stanza_queue
258
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diff changeset
162 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
220
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diff changeset
163 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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164 local queue = origin.outgoing_stanza_queue;
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165 if handled_stanza_count > #queue then
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166 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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diff changeset
167 handled_stanza_count, #queue);
345
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168 module:log("debug", "Client h: %d, our h: %d", tonumber(stanza.attr.h), origin.last_acknowledged_stanza);
220
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diff changeset
169 for i=1,#queue do
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170 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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diff changeset
171 end
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diff changeset
172 end
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diff changeset
173 for i=1,math_min(handled_stanza_count,#queue) do
160
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174 t_remove(origin.outgoing_stanza_queue, 1);
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175 end
220
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diff changeset
176 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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177 return true;
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178 end);
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179
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180 --TODO: Optimise... incoming stanzas should be handled by a per-session
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181 -- function that has a counter as an upvalue (no table indexing for increments,
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182 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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183 -- on stanzas
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184
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185 function handle_unacked_stanzas(session)
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186 local queue = session.outgoing_stanza_queue;
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187 local error_attr = { type = "cancel" };
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188 if #queue > 0 then
202
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parents: 201
diff changeset
189 session.outgoing_stanza_queue = {};
160
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190 for i=1,#queue do
256
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parents: 255
diff changeset
191 local reply = st.reply(queue[i]);
160
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192 if reply.attr.to ~= session.full_jid then
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193 reply.attr.type = "error";
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194 reply:tag("error", error_attr)
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195 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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parents: 255
diff changeset
196 core_process_stanza(session, reply);
160
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197 end
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198 end
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199 end
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200 end
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201
622
ce39df945de1 mod_smacks: Use pre-resource-unbind (0.9 feature) to fix reloadability and multiple host support
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parents: 595
diff changeset
202 module:hook("pre-resource-unbind", function (event)
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diff changeset
203 local session, err = event.session, event.error;
625
2c07bcf56a36 mod_smacks: Don't hibernate session on graceful stream close
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parents: 624
diff changeset
204 if session.smacks and err ~= "session closed" 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
205 if not session.resumption_token then
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diff changeset
206 local queue = session.outgoing_stanza_queue;
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207 if #queue > 0 then
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208 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
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209 for i=1,#queue do
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210 module:log("warn", "::%s", tostring(queue[i]));
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211 end
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212 handle_unacked_stanzas(session);
160
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213 end
257
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214 else
586
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diff changeset
215 session.log("debug", "mod_smacks hibernating session for up to %d seconds", resume_timeout);
345
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216 local hibernate_time = os_time(); -- Track the time we went into hibernation
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217 session.hibernating = hibernate_time;
478
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218 local resumption_token = session.resumption_token;
257
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219 timer.add_task(resume_timeout, function ()
586
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220 session.log("debug", "mod_smacks hibernation timeout reached...");
478
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221 -- We need to check the current resumption token for this resource
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222 -- matches the smacks session this timer is for in case it changed
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223 -- (for example, the client may have bound a new resource and
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224 -- started a new smacks session, or not be using smacks)
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225 local curr_session = hosts[session.host].sessions[session.username].sessions[session.resource];
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226 if curr_session.resumption_token == resumption_token
345
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227 -- Check the hibernate time still matches what we think it is,
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228 -- otherwise the session resumed and re-hibernated.
478
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229 and session.hibernating == hibernate_time then
586
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230 session.log("debug", "Destroying session for hibernating too long");
345
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231 session_registry[session.resumption_token] = nil;
257
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232 session.resumption_token = nil;
345
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233 sessionmanager.destroy_session(session);
586
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234 else
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235 session.log("debug", "Session resumed before hibernation timeout, all is well")
257
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236 end
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237 end);
622
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238 return true; -- Postpone destruction for now
160
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parents:
diff changeset
239 end
258
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diff changeset
240
160
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parents:
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241 end
622
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242 end);
345
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243
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244 module:hook_stanza(xmlns_sm, "resume", function (session, stanza)
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245 local id = stanza.attr.previd;
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246 local original_session = session_registry[id];
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247 if not original_session then
588
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diff changeset
248 session.log("debug", "Tried to resume non-existent session with id %s", id);
345
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249 session.send(st.stanza("failed", sm_attr)
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250 :tag("item-not-found", { xmlns = xmlns_errors })
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251 );
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252 elseif session.username == original_session.username
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253 and session.host == original_session.host then
587
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254 session.log("debug", "mod_smacks resuming existing session...");
345
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255 -- TODO: All this should move to sessionmanager (e.g. session:replace(new_session))
623
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256 if original_session.conn then
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257 session.log("debug", "mod_smacks closing an old connection for this session");
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258 local conn = original_session.conn;
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259 c2s_sessions[conn] = nil;
623
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260 conn:close();
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261 end
345
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262 original_session.ip = session.ip;
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263 original_session.conn = session.conn;
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diff changeset
264 original_session.send = session.send;
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265 original_session.stream = session.stream;
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266 original_session.secure = session.secure;
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267 original_session.hibernating = nil;
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268 local filter = original_session.filter;
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269 local stream = session.stream;
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270 local log = session.log;
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diff changeset
271 function original_session.data(data)
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272 data = filter("bytes/in", data);
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diff changeset
273 if data then
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diff changeset
274 local ok, err = stream:feed(data);
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275 if ok then return; end
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diff changeset
276 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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diff changeset
277 original_session:close("xml-not-well-formed");
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diff changeset
278 end
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diff changeset
279 end
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diff changeset
280 wrap_session(original_session, true);
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281 -- Inform xmppstream of the new session (passed to its callbacks)
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diff changeset
282 stream:set_session(original_session);
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diff changeset
283 -- Similar for connlisteners
640
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diff changeset
284 c2s_sessions[session.conn] = original_session;
345
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parents: 263
diff changeset
285
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diff changeset
286 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
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diff changeset
287 h = original_session.handled_stanza_count, previd = id }));
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diff changeset
288
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diff changeset
289 -- Fake an <a> with the h of the <resume/> from the client
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diff changeset
290 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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diff changeset
291 h = stanza.attr.h }));
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diff changeset
292
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diff changeset
293 -- Ok, we need to re-send any stanzas that the client didn't see
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diff changeset
294 -- ...they are what is now left in the outgoing stanza queue
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diff changeset
295 local queue = original_session.outgoing_stanza_queue;
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diff changeset
296 for i=1,#queue do
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diff changeset
297 session.send(queue[i]);
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diff changeset
298 end
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diff changeset
299 else
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diff changeset
300 log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
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diff changeset
301 session.username or "?", session.host or "?", session.type,
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diff changeset
302 original_session.username or "?", original_session.host or "?", original_session.type);
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diff changeset
303 session.send(st.stanza("failed", sm_attr)
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diff changeset
304 :tag("not-authorized", { xmlns = xmlns_errors }));
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diff changeset
305 end
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diff changeset
306 return true;
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diff changeset
307 end);