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annotate mod_smacks/mod_smacks.lua @ 332:d9c1231db77b

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mod_admin_web: Make dependency fetching more reliable
author Florian Zeitz <florob@babelmonkeys.de>
date Thu, 03 Feb 2011 22:44:02 +0100
parents 41f1cac40560
children 445178d15b51
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1 local st = require "util.stanza";
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3 local t_insert, t_remove = table.insert, table.remove;
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4 local math_min = math.min;
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5 local tonumber, tostring = tonumber, tostring;
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6 local add_filter = require "util.filters".add_filter;
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7 local timer = require "util.timer";
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9 local xmlns_sm = "urn:xmpp:sm:2";
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11 local sm_attr = { xmlns = xmlns_sm };
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12
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13 local resume_timeout = 300;
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14 local max_unacked_stanzas = 0;
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15
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16 module:hook("stream-features",
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17 function (event)
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18 event.features:tag("sm", sm_attr):tag("optional"):up():up();
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19 end);
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21 module:hook("s2s-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_stanza(xmlns_sm, "enable",
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27 function (session, stanza)
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28 module:log("debug", "Enabling stream management");
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29 session.smacks = true;
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30
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31 -- Overwrite process_stanza() and send()
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32 local queue = {};
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33 session.outgoing_stanza_queue = queue;
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34 session.last_acknowledged_stanza = 0;
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35 local _send = session.sends2s or session.send;
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36 local function new_send(stanza)
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37 local attr = stanza.attr;
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38 if attr and not attr.xmlns then -- Stanza in default stream namespace
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39 queue[#queue+1] = st.clone(stanza);
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40 end
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41 local ok, err = _send(stanza);
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42 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack then
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43 session.awaiting_ack = true;
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44 return _send(st.stanza("r", { xmlns = xmlns_sm }));
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45 end
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46 return ok, err;
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47 end
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48
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49 if session.sends2s then
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50 session.sends2s = new_send;
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51 else
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52 session.send = new_send;
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53 end
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54
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55 session.handled_stanza_count = 0;
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56 add_filter(session, "stanzas/in", function (stanza)
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57 if not stanza.attr.xmlns then
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58 session.handled_stanza_count = session.handled_stanza_count + 1;
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59 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
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60 end
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61 return stanza;
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62 end);
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63
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64 if not stanza.attr.resume then -- FIXME: Resumption should be a different spec :/
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65 _send(st.stanza("enabled", sm_attr));
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66 return true;
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67 end
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68 end, 100);
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70 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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71 if not origin.smacks then
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72 module:log("debug", "Received ack request from non-smack-enabled session");
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73 return;
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74 end
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75 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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76 -- Reply with <a>
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77 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
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78 return true;
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79 end);
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81 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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82 if not origin.smacks then return; end
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83 origin.awaiting_ack = nil;
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84 -- Remove handled stanzas from outgoing_stanza_queue
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85 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
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86 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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87 local queue = origin.outgoing_stanza_queue;
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88 if handled_stanza_count > #queue then
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89 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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90 handled_stanza_count, #queue);
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91 for i=1,#queue do
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92 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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93 end
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94 end
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95 for i=1,math_min(handled_stanza_count,#queue) do
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96 t_remove(origin.outgoing_stanza_queue, 1);
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97 end
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98 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
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99 return true;
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100 end);
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101
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102 --TODO: Optimise... incoming stanzas should be handled by a per-session
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103 -- function that has a counter as an upvalue (no table indexing for increments,
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104 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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105 -- on stanzas
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106
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107 function handle_unacked_stanzas(session)
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108 local queue = session.outgoing_stanza_queue;
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109 local error_attr = { type = "cancel" };
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110 if #queue > 0 then
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111 session.outgoing_stanza_queue = {};
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112 for i=1,#queue do
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113 local reply = st.reply(queue[i]);
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114 if reply.attr.to ~= session.full_jid then
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115 reply.attr.type = "error";
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116 reply:tag("error", error_attr)
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117 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
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118 core_process_stanza(session, reply);
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119 end
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120 end
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121 end
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122 end
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123
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124 local _destroy_session = sessionmanager.destroy_session;
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125 function sessionmanager.destroy_session(session, err)
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126 if session.smacks then
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127 if not session.resumption_token then
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128 local queue = session.outgoing_stanza_queue;
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129 if #queue > 0 then
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130 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
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131 for i=1,#queue do
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132 module:log("warn", "::%s", tostring(queue[i]));
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133 end
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134 handle_unacked_stanzas(session);
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135 end
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136 else
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137 session.hibernating = true;
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138 timer.add_task(resume_timeout, function ()
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139 if session.hibernating then
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140 session.resumption_token = nil;
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141 sessionmanager.destroy_session(session); -- Re-destroy
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142 end
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143 end);
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144 return; -- Postpone destruction for now
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145 end
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146
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147 end
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148 return _destroy_session(session, err);
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149 end