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mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
author Matthew Wild <mwild1@gmail.com>
date Thu, 03 Jun 2010 01:08:58 +0100
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children 64a573203c20
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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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1 local st = require "util.stanza";
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2
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3 local t_insert, t_remove = table.insert, table.remove;
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4 local tonumber, tostring = tonumber, tostring;
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5
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6 local xmlns_sm = "urn:xmpp:sm:2";
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7
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8 local sm_attr = { xmlns = xmlns_sm };
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9
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10 module:add_event_hook("stream-features",
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11 function (session, features)
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12 features:tag("sm", sm_attr):tag("optional"):up():up();
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13 end);
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14
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15 module:hook("s2s-stream-features",
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16 function (data)
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17 data.features:tag("sm", sm_attr):tag("optional"):up():up();
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18 end);
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19
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20 module:hook_stanza(xmlns_sm, "enable",
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21 function (session, stanza)
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22 module:log("debug", "Enabling stream management");
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23 session.smacks = true;
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24 session.handled_stanza_count = 0;
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25 -- Overwrite process_stanza() and send()
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26 local queue, queue_length = {}, 0;
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27 session.outgoing_stanza_queue, session.outgoing_stanza_count = queue, queue_length;
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28 local _send = session.send;
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29 function session.send(stanza)
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30 local attr = stanza.attr;
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31 if attr and not attr.xmlns then -- Stanza in default stream namespace
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32 queue_length = queue_length + 1;
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33 session.outgoing_stanza_count = queue_length;
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34 queue[queue_length] = st.reply(stanza);
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35 end
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36 local ok, err = _send(stanza);
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37 if ok then
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38 return _send(st.stanza("r", { xmlns = xmlns_sm }));
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39 end
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40 return ok, err;
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41 end
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42 _send(st.stanza("enabled", sm_attr));
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43 return true;
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44 end);
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45
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46 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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47 if not origin.smacks then
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48 module:log("debug", "Received ack request from non-smack-enabled session");
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49 return;
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50 end
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51 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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52 -- Reply with <a>
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53 origin.send(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
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54 return true;
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55 end);
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56
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57 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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58 if not origin.smacks then return; end
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59
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60 -- Remove handled stanzas from outgoing_stanza_queue
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61 local handled_stanza_count = tonumber(stanza.attr.h)+1;
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62 for i=1,handled_stanza_count do
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63 t_remove(origin.outgoing_stanza_queue, 1);
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64 end
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65 return true;
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66 end);
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67
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68 --TODO: Optimise... incoming stanzas should be handled by a per-session
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69 -- function that has a counter as an upvalue (no table indexing for increments,
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70 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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71 -- on stanzas
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72
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73 function catch_all_incoming_stanzas(data)
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74 local origin, stanza = data.origin, data.stanza;
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75 if origin.smacks and not stanza.handled then
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76 stanza.handled = true;
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77 origin.handled_stanza_count = origin.handled_stanza_count + 1;
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78 module:log("debug", "Handled %d stanzas", origin.handled_stanza_count);
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79 end
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80 end
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81 module:hook("message/bare", catch_all_incoming_stanzas, 1000);
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82 module:hook("message/full", catch_all_incoming_stanzas, 1000);
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83 module:hook("message/host", catch_all_incoming_stanzas, 1000);
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84
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85 module:hook("presence/bare", catch_all_incoming_stanzas, 1000);
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86 module:hook("presence/full", catch_all_incoming_stanzas, 1000);
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87 module:hook("presence/host", catch_all_incoming_stanzas, 1000);
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88
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89 module:hook("iq/bare", catch_all_incoming_stanzas, 1000);
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90 module:hook("iq/full", catch_all_incoming_stanzas, 1000);
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91 module:hook("iq/host", catch_all_incoming_stanzas, 1000);
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92
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93 function handle_unacked_stanzas(session)
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94 local queue = session.outgoing_stanza_queue;
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95 local error_attr = { type = "cancel" };
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96 if #queue > 0 then
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97 for i=1,#queue do
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98 local reply = queue[i];
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99 if reply.attr.to ~= session.full_jid then
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100 reply.attr.type = "error";
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101 reply:tag("error", error_attr)
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102 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
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103 core_process_stanza(session, queue[i]);
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104 end
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105 queue[i] = nil;
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106 end
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107 end
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108 end
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109
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110 local _destroy_session = sessionmanager.destroy_session;
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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111 function sessionmanager.destroy_session(session, err)
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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112 if session.smacks then
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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113 local queue = session.outgoing_stanza_queue;
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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114 if #queue > 0 then
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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115 module:log("warn", "Destroying session with %d unacked stanzas:", #queue);
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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116 for i=1,#queue do
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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117 module:log("warn", "::%s", tostring(queue[i]));
9a7671720dec mod_smacks: XEP-0198 Stream Management acks. Initial commit - very rough, useful mainly for testing at the moment, most certainly contains bugs :)
Matthew Wild <mwild1@gmail.com>
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118 end
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119 handle_unacked_stanzas(session);
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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120 end
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121 end
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122 return _destroy_session(session, err);
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123 end