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annotate mod_smacks/mod_smacks.lua @ 202:d11478ae374e

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mod_smacks: Clean outgoing stanza queue correctly on session close
author Matthew Wild <mwild1@gmail.com>
date Thu, 08 Jul 2010 14:01:52 +0100
parents bc24f58a0d39
children 263858d40ceb
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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 tonumber, tostring = tonumber, tostring;
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5 local add_filter = require "util.filters".add_filter;
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7 local xmlns_sm = "urn:xmpp:sm:2";
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9 local sm_attr = { xmlns = xmlns_sm };
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10
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11 local max_unacked_stanzas = 0;
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12
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13 module:add_event_hook("stream-features",
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14 function (session, features)
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15 features:tag("sm", sm_attr):tag("optional"):up():up();
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16 end);
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18 module:hook("s2s-stream-features",
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19 function (data)
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20 data.features:tag("sm", sm_attr):tag("optional"):up():up();
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21 end);
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23 module:hook_stanza(xmlns_sm, "enable",
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24 function (session, stanza)
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25 module:log("debug", "Enabling stream management");
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26 session.smacks = true;
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27 session.handled_stanza_count = 0;
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28 -- Overwrite process_stanza() and send()
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29 local queue, queue_length = {}, 0;
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30 session.outgoing_stanza_queue, session.outgoing_stanza_count = queue, queue_length;
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31 local _send = session.send;
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32 function session.send(stanza)
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33 local attr = stanza.attr;
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34 if attr and not attr.xmlns then -- Stanza in default stream namespace
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35 queue_length = queue_length + 1;
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36 session.outgoing_stanza_count = queue_length;
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37 queue[queue_length] = st.reply(stanza);
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38 end
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39 local ok, err = _send(stanza);
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40 if ok and queue_length > max_unacked_stanzas and not session.awaiting_ack then
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41 session.awaiting_ack = true;
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42 return _send(st.stanza("r", { xmlns = xmlns_sm }));
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43 end
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44 return ok, err;
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45 end
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47 session.handled_stanza_count = 0;
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48 add_filter(session, "stanzas/in", function (stanza)
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49 if not stanza.attr.xmlns then
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50 session.handled_stanza_count = session.handled_stanza_count + 1;
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51 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
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52 end
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53 return stanza;
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54 end);
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56 if not stanza.attr.resume then -- FIXME: Resumption should be a different spec :/
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57 _send(st.stanza("enabled", sm_attr));
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58 return true;
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59 end
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60 end, 100);
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62 module:hook_stanza(xmlns_sm, "r", function (origin, stanza)
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63 if not origin.smacks then
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64 module:log("debug", "Received ack request from non-smack-enabled session");
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65 return;
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66 end
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67 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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68 -- Reply with <a>
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69 origin.send(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
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70 return true;
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71 end);
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73 module:hook_stanza(xmlns_sm, "a", function (origin, stanza)
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74 if not origin.smacks then return; end
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75 origin.awaiting_ack = nil;
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76 -- Remove handled stanzas from outgoing_stanza_queue
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77 local handled_stanza_count = tonumber(stanza.attr.h)+1;
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78 for i=1,handled_stanza_count do
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79 t_remove(origin.outgoing_stanza_queue, 1);
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80 end
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81 return true;
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82 end);
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83
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84 --TODO: Optimise... incoming stanzas should be handled by a per-session
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85 -- function that has a counter as an upvalue (no table indexing for increments,
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86 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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87 -- on stanzas
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88
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89 function handle_unacked_stanzas(session)
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90 local queue = session.outgoing_stanza_queue;
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91 local error_attr = { type = "cancel" };
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92 if #queue > 0 then
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93 session.outgoing_stanza_queue = {};
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94 for i=1,#queue do
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95 local reply = queue[i];
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96 if reply.attr.to ~= session.full_jid then
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97 reply.attr.type = "error";
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98 reply:tag("error", error_attr)
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99 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
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100 core_process_stanza(session, queue[i]);
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101 end
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102 end
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103 end
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104 end
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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105
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106 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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107 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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108 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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109 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>
parents:
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110 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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111 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>
parents:
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112 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>
parents:
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113 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>
parents:
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114 end
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>
parents:
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115 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 :)
Matthew Wild <mwild1@gmail.com>
parents:
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116 end
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>
parents:
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117 end
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 return _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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119 end