prosody-modules
263858d40ceb
mod_smacks/mod_smacks.lua

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mod_smacks/mod_smacks.lua @ 220:263858d40ceb

mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
author Matthew Wild <mwild1@gmail.com>
date Sat, 24 Jul 2010 11:07:38 +0100
parent 202:d11478ae374e
child 255:9b9b089407b1
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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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8 local xmlns_sm = "urn:xmpp:sm:2";
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10 local sm_attr = { xmlns = xmlns_sm };
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11
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12 local max_unacked_stanzas = 0;
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13
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14 module:add_event_hook("stream-features",
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15 function (session, features)
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16 features:tag("sm", sm_attr):tag("optional"):up():up();
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17 end);
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19 module:hook("s2s-stream-features",
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20 function (data)
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21 data.features:tag("sm", sm_attr):tag("optional"):up():up();
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22 end);
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24 module:hook_stanza(xmlns_sm, "enable",
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25 function (session, stanza)
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26 module:log("debug", "Enabling stream management");
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27 session.smacks = true;
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28
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29 -- Overwrite process_stanza() and send()
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30 local queue = {};
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31 session.outgoing_stanza_queue = queue;
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32 session.last_acknowledged_stanza = 0;
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33 local _send = session.send;
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34 function session.send(stanza)
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35 local attr = stanza.attr;
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36 if attr and not attr.xmlns then -- Stanza in default stream namespace
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37 queue[#queue+1] = 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 > 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)-origin.last_acknowledged_stanza;
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78 local queue = origin.outgoing_stanza_queue;
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79 if handled_stanza_count > #queue then
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80 module:log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
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81 handled_stanza_count, #queue);
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82 for i=1,#queue do
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83 module:log("debug", "Q item %d: %s", i, tostring(queue[i]));
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84 end
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85 end
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86 for i=1,math_min(handled_stanza_count,#queue) do
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87 t_remove(origin.outgoing_stanza_queue, 1);
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88 end
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89 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
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90 return true;
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91 end);
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92
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93 --TODO: Optimise... incoming stanzas should be handled by a per-session
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94 -- function that has a counter as an upvalue (no table indexing for increments,
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95 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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96 -- on stanzas
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97
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98 function handle_unacked_stanzas(session)
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99 local queue = session.outgoing_stanza_queue;
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100 local error_attr = { type = "cancel" };
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101 if #queue > 0 then
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102 session.outgoing_stanza_queue = {};
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103 for i=1,#queue do
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104 local reply = queue[i];
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105 if reply.attr.to ~= session.full_jid then
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106 reply.attr.type = "error";
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107 reply:tag("error", error_attr)
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108 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
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109 core_process_stanza(session, 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 :)
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110 end
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111 end
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112 end
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113 end
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114
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115 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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116 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 :)
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117 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 :)
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118 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 :)
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119 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 :)
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120 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 :)
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121 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 :)
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122 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 :)
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123 end
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124 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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125 end
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126 end
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127 return _destroy_session(session, err);
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128 end