prosody-modules
d4a4ed31567e
mod_smacks/mod_smacks.lua

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mod_smacks/mod_smacks.lua @ 1522:d4a4ed31567e

mod_smacks: Trick session.send() into not returning nil or mod_message will act as if messages were not delivered
author Kim Alvefur <zash@zash.se>
date Mon, 13 Oct 2014 14:19:49 +0200
parent 1520:2881d532f385
child 1526:120817435151
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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parents:
diff changeset
1 local st = require "util.stanza";
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diff changeset
2 local uuid_generate = require "util.uuid".generate;
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parents:
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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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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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bc24f58a0d39 mod_smacks: Use filters for catching incoming stanzas (more reliable and efficient), also add some logic to make compatible with the stream resumption module (coming soon)
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8 local add_filter = require "util.filters".add_filter;
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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
9 local timer = require "util.timer";
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db2a40cbd6ef Add a <delay> to stanzas that are queued (and don't have one already), so clients can show them with the original timestamp.
Thijs Alkemade <thijsalkemade@gmail.com>
parents: 592
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10 local datetime = require "util.datetime";
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11
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12 local xmlns_sm2 = "urn:xmpp:sm:2";
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13 local xmlns_sm3 = "urn:xmpp:sm:3";
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parents: 263
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14 local xmlns_errors = "urn:ietf:params:xml:ns:xmpp-stanzas";
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db2a40cbd6ef Add a <delay> to stanzas that are queued (and don't have one already), so clients can show them with the original timestamp.
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15 local xmlns_delay = "urn:xmpp:delay";
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16
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17 local sm2_attr = { xmlns = xmlns_sm2 };
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18 local sm3_attr = { xmlns = xmlns_sm3 };
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19
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06a78cba6499 mod_smacks: get_option+_number
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20 local resume_timeout = module:get_option_number("smacks_hibernation_time", 300);
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44b69c3d5351 mod_smacks: Fix smacks on s2s connections, but disable it by default.
Kim Alvefur <zash@zash.se>
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21 local s2s_smacks = module:get_option_boolean("smacks_enabled_s2s", false);
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842a8a3b0d81 mod_smacks: Make smacks_max_unacked_stanzas configurable
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22 local max_unacked_stanzas = module:get_option_number("smacks_max_unacked_stanzas", 0);
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713c6791fbcc mod_smacks: Import prosody.core_process_stanza()
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23 local core_process_stanza = prosody.core_process_stanza;
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92c6f84ec446 mod_smacks: Use require to import (thanks a lot, autocomplete)
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24 local sessionmanager = require"core.sessionmanager";
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25
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d87131b29bbd mod_smacks: Remove dependency on connlisteners (use sessions table shared by mod_c2s directly)
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26 local c2s_sessions = module:shared("/*/c2s/sessions");
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27 local session_registry = {};
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28
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29 local function can_do_smacks(session, advertise_only)
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30 if session.smacks then return false, "unexpected-request", "Stream management is already enabled"; end
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31
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32 local session_type = session.type;
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7693724881b3 Fix a typo in mod_smacks (type -> session_type).
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33 if session_type == "c2s" then
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34 if not(advertise_only) and not(session.resource) then -- Fail unless we're only advertising sm
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f9c73c1249cd Update smacks to urn:xmpp:sm:3. Fix typo in can_do_smacks.
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35 return false, "unexpected-request", "Client must bind a resource before enabling stream management";
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36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
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parents: 590
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36 end
36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
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parents: 590
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37 return true;
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7693724881b3 Fix a typo in mod_smacks (type -> session_type).
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parents: 594
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38 elseif s2s_smacks and (session_type == "s2sin" or session_type == "s2sout") then
591
36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
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parents: 590
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39 return true;
36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
Matthew Wild <mwild1@gmail.com>
parents: 590
diff changeset
40 end
36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
Matthew Wild <mwild1@gmail.com>
parents: 590
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41 return false, "service-unavailable", "Stream management is not available for this stream";
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parents: 590
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42 end
36003cae2370 mod_smacks: Consolidate logic for deciding whether to advertise or allow smacks for a given session, and fix an issue with not allowing s2s connections to enable smacks because of not binding a resource... (thanks xnyphs)
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parents: 590
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43
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44 module:hook("stream-features",
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45 function (event)
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46 if can_do_smacks(event.origin, true) then
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47 event.features:tag("sm", sm2_attr):tag("optional"):up():up();
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48 event.features:tag("sm", sm3_attr):tag("optional"):up():up();
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49 end
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50 end);
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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52 module:hook("s2s-stream-features",
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53 function (event)
591
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parents: 590
diff changeset
54 if can_do_smacks(event.origin, true) then
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55 event.features:tag("sm", sm2_attr):tag("optional"):up():up();
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56 event.features:tag("sm", sm3_attr):tag("optional"):up():up();
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57 end
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58 end);
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parents:
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59
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60 module:hook_stanza("http://etherx.jabber.org/streams", "features",
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61 function (session, stanza)
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62 if can_do_smacks(session) then
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63 if stanza:get_child("sm", xmlns_sm3) then
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64 session.sends2s(st.stanza("enable", sm3_attr));
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65 elseif stanza:get_child("sm", xmlns_sm2) then
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66 session.sends2s(st.stanza("enable", sm2_attr));
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67 end
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68 end
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69 end);
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70
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71 local function outgoing_stanza_filter(stanza, session)
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72 local is_stanza = stanza.attr and not stanza.attr.xmlns;
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73 if is_stanza and not stanza._cached then -- Stanza in default stream namespace
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74 local queue = session.outgoing_stanza_queue;
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75 local cached_stanza = st.clone(stanza);
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76 cached_stanza._cached = true;
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77
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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 session.log("debug", "#queue = %d", #queue);
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84 if session.hibernating then
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85 session.log("debug", "hibernating, stanza queued");
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86 return ""; -- Hack to make session.send() not return nil
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87 end
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88 if #queue > max_unacked_stanzas then
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89 module:add_timer(0, function ()
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90 if not session.awaiting_ack then
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91 session.awaiting_ack = true;
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92 session.send(st.stanza("r", { xmlns = session.smacks }));
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93 end
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94 end);
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95 end
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parents: 1518
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96 end
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97 return stanza;
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98 end
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99
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100 local function count_incoming_stanzas(stanza, session)
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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);
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104 end
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105 return stanza;
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106 end
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107
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108 local function wrap_session(session, resume)
345
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109 local queue;
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110 if not resume then
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111 queue = {};
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112 session.outgoing_stanza_queue = queue;
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113 session.last_acknowledged_stanza = 0;
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114 else
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115 queue = session.outgoing_stanza_queue;
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116 end
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117
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118 add_filter(session, "stanzas/out", outgoing_stanza_filter, -1000);
988
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119
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120 local session_close = session.close;
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121 function session.close(...)
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122 if session.resumption_token then
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123 session_registry[session.resumption_token] = nil;
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124 session.resumption_token = nil;
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125 end
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126 return session_close(...);
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127 end
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128
345
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129 if not resume then
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130 session.handled_stanza_count = 0;
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131 add_filter(session, "stanzas/in", count_incoming_stanzas, 1000);
345
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132 end
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133
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134 return session;
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135 end
201
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parents: 200
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136
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137 function handle_enable(session, stanza, xmlns_sm)
591
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138 local ok, err, err_text = can_do_smacks(session);
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parents: 590
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139 if not ok then
590
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140 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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141 session.send(st.stanza("failed", { xmlns = xmlns_sm }):tag(err, { xmlns = xmlns_errors}));
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142 return true;
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diff changeset
143 end
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144
345
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145 module:log("debug", "Enabling stream management");
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146 session.smacks = xmlns_sm;
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147
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148 wrap_session(session, false);
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149
345
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150 local resume_token;
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151 local resume = stanza.attr.resume;
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152 if resume == "true" or resume == "1" then
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153 resume_token = uuid_generate();
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154 session_registry[resume_token] = session;
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155 session.resumption_token = resume_token;
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diff changeset
156 end
576
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diff changeset
157 (session.sends2s or session.send)(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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diff changeset
158 return true;
1298
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159 end
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160 module:hook_stanza(xmlns_sm2, "enable", function (session, stanza) return handle_enable(session, stanza, xmlns_sm2); end, 100);
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diff changeset
161 module:hook_stanza(xmlns_sm3, "enable", function (session, stanza) return handle_enable(session, stanza, xmlns_sm3); end, 100);
576
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diff changeset
162
1298
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163 function handle_enabled(session, stanza, xmlns_sm)
576
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diff changeset
164 module:log("debug", "Enabling stream management");
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165 session.smacks = xmlns_sm;
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166
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diff changeset
167 wrap_session(session, false);
576
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diff changeset
168
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diff changeset
169 -- FIXME Resume?
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170
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diff changeset
171 return true;
1298
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172 end
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173 module:hook_stanza(xmlns_sm2, "enabled", function (session, stanza) return handle_enabled(session, stanza, xmlns_sm2); end, 100);
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diff changeset
174 module:hook_stanza(xmlns_sm3, "enabled", function (session, stanza) return handle_enabled(session, stanza, xmlns_sm3); end, 100);
160
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diff changeset
175
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diff changeset
176 function handle_r(origin, stanza, xmlns_sm)
160
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diff changeset
177 if not origin.smacks then
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diff changeset
178 module:log("debug", "Received ack request from non-smack-enabled session");
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diff changeset
179 return;
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180 end
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181 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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diff changeset
182 -- Reply with <a>
255
9b9b089407b1 mod_smacks: Fix to reply to stream for s2s sessions
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parents: 220
diff changeset
183 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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184 return true;
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diff changeset
185 end
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diff changeset
186 module:hook_stanza(xmlns_sm2, "r", function (origin, stanza) return handle_r(origin, stanza, xmlns_sm2); end);
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diff changeset
187 module:hook_stanza(xmlns_sm3, "r", function (origin, stanza) return handle_r(origin, stanza, xmlns_sm3); end);
160
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parents:
diff changeset
188
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diff changeset
189 function handle_a(origin, stanza)
160
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parents:
diff changeset
190 if not origin.smacks then return; end
200
64a573203c20 mod_smacks: Better logic for deciding what is a stanza and what is not, and deciding when to send ack requests
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parents: 160
diff changeset
191 origin.awaiting_ack = nil;
160
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parents:
diff changeset
192 -- Remove handled stanzas from outgoing_stanza_queue
258
36648205b10a mod_smacks: Add commented log statement for future debugging
Matthew Wild <mwild1@gmail.com>
parents: 257
diff changeset
193 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
1407
b631c8a8b9e7 mod_smacks: Assert that the 'h' attribute is present and a number
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parents: 1406
diff changeset
194 local h = tonumber(stanza.attr.h);
b631c8a8b9e7 mod_smacks: Assert that the 'h' attribute is present and a number
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diff changeset
195 if not h then
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parents: 1406
diff changeset
196 origin:close{ condition = "invalid-xml"; text = "Missing or invalid 'h' attribute"; };
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parents: 1406
diff changeset
197 end
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parents: 1406
diff changeset
198 local handled_stanza_count = h-origin.last_acknowledged_stanza;
220
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parents: 202
diff changeset
199 local queue = origin.outgoing_stanza_queue;
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parents: 202
diff changeset
200 if handled_stanza_count > #queue then
1416
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Kim Alvefur <zash@zash.se>
parents: 1408
diff changeset
201 origin.log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
220
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parents: 202
diff changeset
202 handled_stanza_count, #queue);
1416
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diff changeset
203 origin.log("debug", "Client h: %d, our h: %d", tonumber(stanza.attr.h), origin.last_acknowledged_stanza);
220
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parents: 202
diff changeset
204 for i=1,#queue do
1416
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diff changeset
205 origin.log("debug", "Q item %d: %s", i, tostring(queue[i]));
220
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parents: 202
diff changeset
206 end
263858d40ceb mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
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parents: 202
diff changeset
207 end
263858d40ceb mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
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parents: 202
diff changeset
208 for i=1,math_min(handled_stanza_count,#queue) do
160
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parents:
diff changeset
209 t_remove(origin.outgoing_stanza_queue, 1);
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diff changeset
210 end
1406
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parents: 1405
diff changeset
211 origin.log("debug", "#queue = %d", #queue);
220
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parents: 202
diff changeset
212 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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parents:
diff changeset
213 return true;
1298
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diff changeset
214 end
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diff changeset
215 module:hook_stanza(xmlns_sm2, "a", handle_a);
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diff changeset
216 module:hook_stanza(xmlns_sm3, "a", handle_a);
160
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217
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218 --TODO: Optimise... incoming stanzas should be handled by a per-session
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219 -- function that has a counter as an upvalue (no table indexing for increments,
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220 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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221 -- on stanzas
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222
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223 function handle_unacked_stanzas(session)
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224 local queue = session.outgoing_stanza_queue;
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225 local error_attr = { type = "cancel" };
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226 if #queue > 0 then
202
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diff changeset
227 session.outgoing_stanza_queue = {};
160
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228 for i=1,#queue do
256
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229 local reply = st.reply(queue[i]);
160
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230 if reply.attr.to ~= session.full_jid then
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231 reply.attr.type = "error";
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232 reply:tag("error", error_attr)
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233 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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234 core_process_stanza(session, reply);
160
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235 end
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236 end
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237 end
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238 end
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239
622
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240 module:hook("pre-resource-unbind", function (event)
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241 local session, err = event.session, event.error;
1024
d7655e634c30 mod_smacks: Allow resumption if the TCP connection is closed from our end, c15cea87036f ensures distinction from cleanly closed streams (thanks Lance)
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parents: 994
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242 if session.smacks then
257
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243 if not session.resumption_token then
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244 local queue = session.outgoing_stanza_queue;
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parents: 256
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245 if #queue > 0 then
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diff changeset
246 session.log("warn", "Destroying session with %d unacked stanzas", #queue);
257
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247 handle_unacked_stanzas(session);
160
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248 end
257
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249 else
586
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250 session.log("debug", "mod_smacks hibernating session for up to %d seconds", resume_timeout);
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251 local hibernate_time = os_time(); -- Track the time we went into hibernation
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252 session.hibernating = hibernate_time;
478
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253 local resumption_token = session.resumption_token;
257
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254 timer.add_task(resume_timeout, function ()
586
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255 session.log("debug", "mod_smacks hibernation timeout reached...");
478
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256 -- We need to check the current resumption token for this resource
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257 -- matches the smacks session this timer is for in case it changed
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258 -- (for example, the client may have bound a new resource and
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259 -- started a new smacks session, or not be using smacks)
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260 local curr_session = full_sessions[session.full_jid];
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diff changeset
261 if false and session.destroyed then
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262 session.log("debug", "The session has already been destroyed");
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263 elseif curr_session and curr_session.resumption_token == resumption_token
345
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diff changeset
264 -- Check the hibernate time still matches what we think it is,
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265 -- otherwise the session resumed and re-hibernated.
478
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parents: 345
diff changeset
266 and session.hibernating == hibernate_time then
586
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diff changeset
267 session.log("debug", "Destroying session for hibernating too long");
345
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268 session_registry[session.resumption_token] = nil;
257
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diff changeset
269 session.resumption_token = nil;
345
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diff changeset
270 sessionmanager.destroy_session(session);
586
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diff changeset
271 else
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diff changeset
272 session.log("debug", "Session resumed before hibernation timeout, all is well")
257
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diff changeset
273 end
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diff changeset
274 end);
622
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diff changeset
275 return true; -- Postpone destruction for now
160
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276 end
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diff changeset
277
160
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278 end
622
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diff changeset
279 end);
345
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parents: 263
diff changeset
280
1298
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diff changeset
281 function handle_resume(session, stanza, xmlns_sm)
925
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parents: 908
diff changeset
282 if session.full_jid then
994
487cd02aada0 mod_smacks: Complain a little louder about clients trying to resume after resource binding
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parents: 988
diff changeset
283 session.log("warn", "Tried to resume after resource binding");
1298
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diff changeset
284 session.send(st.stanza("failed", { xmlns = xmlns_sm })
925
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diff changeset
285 :tag("unexpected-request", { xmlns = xmlns_errors })
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diff changeset
286 );
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diff changeset
287 return true;
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diff changeset
288 end
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parents: 908
diff changeset
289
345
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diff changeset
290 local id = stanza.attr.previd;
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diff changeset
291 local original_session = session_registry[id];
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parents: 263
diff changeset
292 if not original_session then
588
8042558336b6 mod_smacks: Log message when client tries to resume unknown session
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parents: 587
diff changeset
293 session.log("debug", "Tried to resume non-existent session with id %s", id);
1298
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diff changeset
294 session.send(st.stanza("failed", { xmlns = xmlns_sm })
345
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diff changeset
295 :tag("item-not-found", { xmlns = xmlns_errors })
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diff changeset
296 );
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diff changeset
297 elseif session.username == original_session.username
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parents: 263
diff changeset
298 and session.host == original_session.host then
587
322a14acd974 mod_smacks: Add log message on resume
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parents: 586
diff changeset
299 session.log("debug", "mod_smacks resuming existing session...");
345
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diff changeset
300 -- TODO: All this should move to sessionmanager (e.g. session:replace(new_session))
623
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
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parents: 622
diff changeset
301 if original_session.conn then
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
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parents: 622
diff changeset
302 session.log("debug", "mod_smacks closing an old connection for this session");
c1f3958695ea mod_smacks: If a resumed session still has a connection open, close that connection before resuming
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parents: 622
diff changeset
303 local conn = original_session.conn;
640
d87131b29bbd mod_smacks: Remove dependency on connlisteners (use sessions table shared by mod_c2s directly)
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parents: 625
diff changeset
304 c2s_sessions[conn] = nil;
623
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parents: 622
diff changeset
305 conn:close();
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parents: 622
diff changeset
306 end
345
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parents: 263
diff changeset
307 original_session.ip = session.ip;
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parents: 263
diff changeset
308 original_session.conn = session.conn;
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parents: 263
diff changeset
309 original_session.send = session.send;
1520
2881d532f385 mod_smacks: Use filters for queuing outgoing stanzas instead of wrapping session.send()
Kim Alvefur <zash@zash.se>
parents: 1518
diff changeset
310 original_session.send.filter = original_session.filter;
345
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parents: 263
diff changeset
311 original_session.stream = session.stream;
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parents: 263
diff changeset
312 original_session.secure = session.secure;
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parents: 263
diff changeset
313 original_session.hibernating = nil;
1520
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Kim Alvefur <zash@zash.se>
parents: 1518
diff changeset
314 wrap_session(original_session, true);
345
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parents: 263
diff changeset
315 -- Inform xmppstream of the new session (passed to its callbacks)
1520
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parents: 1518
diff changeset
316 original_session.stream:set_session(original_session);
345
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parents: 263
diff changeset
317 -- Similar for connlisteners
640
d87131b29bbd mod_smacks: Remove dependency on connlisteners (use sessions table shared by mod_c2s directly)
Matthew Wild <mwild1@gmail.com>
parents: 625
diff changeset
318 c2s_sessions[session.conn] = original_session;
345
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parents: 263
diff changeset
319
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
320 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
445178d15b51 mod_smacks: Merge mod_fastreconnect (resumption support), fix a number of bugs, refactor the code and add some more comments to explain process
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parents: 263
diff changeset
321 h = original_session.handled_stanza_count, previd = id }));
1343
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Florian Zeitz <florob@babelmonkeys.de>
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322
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323 -- Fake an <a> with the h of the <resume/> from the client
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324 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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parents: 263
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325 h = stanza.attr.h }));
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parents: 1325
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326
345
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parents: 263
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327 -- Ok, we need to re-send any stanzas that the client didn't see
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parents: 263
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328 -- ...they are what is now left in the outgoing stanza queue
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parents: 263
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329 local queue = original_session.outgoing_stanza_queue;
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Kim Alvefur <zash@zash.se>
parents: 1405
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330 session.log("debug", "#queue = %d", #queue);
345
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parents: 263
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331 for i=1,#queue do
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parents: 263
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332 session.send(queue[i]);
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parents: 263
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333 end
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Kim Alvefur <zash@zash.se>
parents: 1405
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334 session.log("debug", "#queue = %d -- after send", #queue);
345
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parents: 263
diff changeset
335 else
755
bab7c4ace803 mod_smacks: Fix log statement
Kim Alvefur <zash@zash.se>
parents: 754
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336 module:log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
345
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parents: 263
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337 session.username or "?", session.host or "?", session.type,
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parents: 263
diff changeset
338 original_session.username or "?", original_session.host or "?", original_session.type);
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659da45a2b4b mod_smacks: Handle both version 2 and version 3 namespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 1293
diff changeset
339 session.send(st.stanza("failed", { xmlns = xmlns_sm })
345
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parents: 263
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340 :tag("not-authorized", { xmlns = xmlns_errors }));
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parents: 263
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341 end
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parents: 263
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342 return true;
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Florian Zeitz <florob@babelmonkeys.de>
parents: 1293
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343 end
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parents: 1293
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344 module:hook_stanza(xmlns_sm2, "resume", function (session, stanza) return handle_resume(session, stanza, xmlns_sm2); end);
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Florian Zeitz <florob@babelmonkeys.de>
parents: 1293
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345 module:hook_stanza(xmlns_sm3, "resume", function (session, stanza) return handle_resume(session, stanza, xmlns_sm3); end);