annotate mod_smacks/mod_smacks.lua @ 1406:7d76dd2310ef

mod_smacks: Add more debug logging
author Kim Alvefur <zash@zash.se>
date Wed, 07 May 2014 14:19:44 +0200
parents 26a2092e289f
children b631c8a8b9e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 local st = require "util.stanza";
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2 local uuid_generate = require "util.uuid".generate;
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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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9 local timer = require "util.timer";
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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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14 local xmlns_errors = "urn:ietf:params:xml:ns:xmpp-stanzas";
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15 local xmlns_delay = "urn:xmpp:delay";
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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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20 local resume_timeout = module:get_option_number("smacks_hibernation_time", 300);
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21 local s2s_smacks = module:get_option_boolean("smacks_enabled_s2s", false);
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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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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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32 local session_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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35 return false, "unexpected-request", "Client must bind a resource before enabling stream management";
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36 end
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37 return true;
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38 elseif s2s_smacks and (session_type == "s2sin" or session_type == "s2sout") then
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39 return true;
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40 end
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41 return false, "service-unavailable", "Stream management is not available for this stream";
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42 end
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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);
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52 module:hook("s2s-stream-features",
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53 function (event)
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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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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 wrap_session(session, resume, xmlns_sm)
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72 local sm_attr = { xmlns = xmlns_sm };
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73 -- Overwrite process_stanza() and send()
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74 local queue;
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75 if not resume then
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76 queue = {};
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77 session.outgoing_stanza_queue = queue;
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78 session.last_acknowledged_stanza = 0;
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79 else
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80 queue = session.outgoing_stanza_queue;
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81 end
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82
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83 local _send = session.sends2s or session.send;
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84 local function new_send(stanza)
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85 local attr = stanza.attr;
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86 if attr and not attr.xmlns then -- Stanza in default stream namespace
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87 local cached_stanza = st.clone(stanza);
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88
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89 if cached_stanza and cached_stanza:get_child("delay", xmlns_delay) == nil then
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90 cached_stanza = cached_stanza:tag("delay", { xmlns = xmlns_delay, from = session.host, stamp = datetime.datetime()});
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91 end
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92
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93 queue[#queue+1] = cached_stanza;
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94 session.log("debug", "#queue = %d", #queue);
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95 end
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96 if session.hibernating then
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97 session.log("debug", "hibernating, stanza queued")
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98 -- The session is hibernating, no point in sending the stanza
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99 -- over a dead connection. It will be delivered upon resumption.
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100 return true;
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101 end
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102 local ok, err = _send(stanza);
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parents: 810
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103 if ok and #queue > max_unacked_stanzas and not session.awaiting_ack and attr and not attr.xmlns then
345
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diff changeset
104 session.awaiting_ack = true;
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105 return _send(st.stanza("r", sm_attr));
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106 end
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diff changeset
107 return ok, err;
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108 end
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109
345
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110 if session.sends2s then
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111 session.sends2s = new_send;
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112 else
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diff changeset
113 session.send = new_send;
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114 end
988
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diff changeset
115
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diff changeset
116 local session_close = session.close;
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117 function session.close(...)
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118 if session.resumption_token then
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diff changeset
119 session_registry[session.resumption_token] = nil;
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120 session.resumption_token = nil;
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121 end
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122 return session_close(...);
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123 end
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124
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125 if not resume then
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126 session.handled_stanza_count = 0;
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127 add_filter(session, "stanzas/in", function (stanza)
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128 if not stanza.attr.xmlns then
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129 session.handled_stanza_count = session.handled_stanza_count + 1;
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130 session.log("debug", "Handled %d incoming stanzas", session.handled_stanza_count);
255
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131 end
345
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132 return stanza;
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133 end);
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134 end
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diff changeset
135
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136 return session;
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137 end
201
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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parents: 200
diff changeset
138
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diff changeset
139 function handle_enable(session, stanza, xmlns_sm)
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
diff changeset
140 local ok, err, err_text = can_do_smacks(session);
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
diff changeset
141 if not ok then
590
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diff changeset
142 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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diff changeset
143 session.send(st.stanza("failed", { xmlns = xmlns_sm }):tag(err, { xmlns = xmlns_errors}));
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144 return true;
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145 end
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146
345
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diff changeset
147 module:log("debug", "Enabling stream management");
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diff changeset
148 session.smacks = true;
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149
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150 wrap_session(session, false, xmlns_sm);
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151
345
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diff changeset
152 local resume_token;
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153 local resume = stanza.attr.resume;
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154 if resume == "true" or resume == "1" then
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diff changeset
155 resume_token = uuid_generate();
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diff changeset
156 session_registry[resume_token] = session;
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diff changeset
157 session.resumption_token = resume_token;
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diff changeset
158 end
576
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parents: 478
diff changeset
159 (session.sends2s or session.send)(st.stanza("enabled", { xmlns = xmlns_sm, id = resume_token, resume = resume }));
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diff changeset
160 return true;
1298
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161 end
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162 module:hook_stanza(xmlns_sm2, "enable", function (session, stanza) return handle_enable(session, stanza, xmlns_sm2); end, 100);
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163 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
164
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diff changeset
165 function handle_enabled(session, stanza, xmlns_sm)
576
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diff changeset
166 module:log("debug", "Enabling stream management");
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diff changeset
167 session.smacks = true;
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168
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169 wrap_session(session, false, xmlns_sm);
576
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diff changeset
170
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diff changeset
171 -- FIXME Resume?
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172
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diff changeset
173 return true;
1298
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diff changeset
174 end
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diff changeset
175 module:hook_stanza(xmlns_sm2, "enabled", function (session, stanza) return handle_enabled(session, stanza, xmlns_sm2); end, 100);
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diff changeset
176 module:hook_stanza(xmlns_sm3, "enabled", function (session, stanza) return handle_enabled(session, stanza, xmlns_sm3); end, 100);
160
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parents:
diff changeset
177
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diff changeset
178 function handle_r(origin, stanza, xmlns_sm)
160
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diff changeset
179 if not origin.smacks then
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diff changeset
180 module:log("debug", "Received ack request from non-smack-enabled session");
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diff changeset
181 return;
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parents:
diff changeset
182 end
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parents:
diff changeset
183 module:log("debug", "Received ack request, acking for %d", origin.handled_stanza_count);
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parents:
diff changeset
184 -- Reply with <a>
255
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diff changeset
185 (origin.sends2s or origin.send)(st.stanza("a", { xmlns = xmlns_sm, h = tostring(origin.handled_stanza_count) }));
160
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diff changeset
186 return true;
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diff changeset
187 end
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diff changeset
188 module:hook_stanza(xmlns_sm2, "r", function (origin, stanza) return handle_r(origin, stanza, xmlns_sm2); end);
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diff changeset
189 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
190
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diff changeset
191 function handle_a(origin, stanza)
160
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parents:
diff changeset
192 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
193 origin.awaiting_ack = nil;
160
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parents:
diff changeset
194 -- 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
195 --log("debug", "ACK: h=%s, last=%s", stanza.attr.h or "", origin.last_acknowledged_stanza or "");
220
263858d40ceb mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
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parents: 202
diff changeset
196 local handled_stanza_count = tonumber(stanza.attr.h)-origin.last_acknowledged_stanza;
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parents: 202
diff changeset
197 local queue = origin.outgoing_stanza_queue;
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parents: 202
diff changeset
198 if handled_stanza_count > #queue then
1405
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Kim Alvefur <zash@zash.se>
parents: 1343
diff changeset
199 session.log("warn", "The client says it handled %d new stanzas, but we only sent %d :)",
220
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parents: 202
diff changeset
200 handled_stanza_count, #queue);
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diff changeset
201 session.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
202 for i=1,#queue do
1405
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diff changeset
203 session.log("debug", "Q item %d: %s", i, tostring(queue[i]));
220
263858d40ceb mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
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parents: 202
diff changeset
204 end
263858d40ceb mod_smacks: Fix the logic for handling outgoing stanzas and ack requests
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parents: 202
diff changeset
205 end
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parents: 202
diff changeset
206 for i=1,math_min(handled_stanza_count,#queue) do
160
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parents:
diff changeset
207 t_remove(origin.outgoing_stanza_queue, 1);
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parents:
diff changeset
208 end
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diff changeset
209 origin.log("debug", "#queue = %d", #queue);
220
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parents: 202
diff changeset
210 origin.last_acknowledged_stanza = origin.last_acknowledged_stanza + handled_stanza_count;
160
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parents:
diff changeset
211 return true;
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diff changeset
212 end
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parents: 1293
diff changeset
213 module:hook_stanza(xmlns_sm2, "a", handle_a);
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parents: 1293
diff changeset
214 module:hook_stanza(xmlns_sm3, "a", handle_a);
160
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parents:
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215
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216 --TODO: Optimise... incoming stanzas should be handled by a per-session
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217 -- function that has a counter as an upvalue (no table indexing for increments,
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218 -- and won't slow non-198 sessions). We can also then remove the .handled flag
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219 -- on stanzas
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220
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221 function handle_unacked_stanzas(session)
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222 local queue = session.outgoing_stanza_queue;
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223 local error_attr = { type = "cancel" };
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diff changeset
224 if #queue > 0 then
202
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diff changeset
225 session.outgoing_stanza_queue = {};
160
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226 for i=1,#queue do
256
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diff changeset
227 local reply = st.reply(queue[i]);
160
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228 if reply.attr.to ~= session.full_jid then
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229 reply.attr.type = "error";
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230 reply:tag("error", error_attr)
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231 :tag("recipient-unavailable", {xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas"});
256
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parents: 255
diff changeset
232 core_process_stanza(session, reply);
160
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233 end
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234 end
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235 end
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236 end
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237
622
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diff changeset
238 module:hook("pre-resource-unbind", function (event)
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diff changeset
239 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)
Kim Alvefur <zash@zash.se>
parents: 994
diff changeset
240 if session.smacks then
257
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parents: 256
diff changeset
241 if not session.resumption_token then
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parents: 256
diff changeset
242 local queue = session.outgoing_stanza_queue;
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parents: 256
diff changeset
243 if #queue > 0 then
1405
26a2092e289f mod_smacks: Log things attached to sessions instead of the module
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parents: 1343
diff changeset
244 session.log("warn", "Destroying session with %d unacked stanzas", #queue);
257
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parents: 256
diff changeset
245 handle_unacked_stanzas(session);
160
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246 end
257
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parents: 256
diff changeset
247 else
586
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parents: 576
diff changeset
248 session.log("debug", "mod_smacks hibernating session for up to %d seconds", resume_timeout);
345
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249 local hibernate_time = os_time(); -- Track the time we went into hibernation
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250 session.hibernating = hibernate_time;
478
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251 local resumption_token = session.resumption_token;
257
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parents: 256
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252 timer.add_task(resume_timeout, function ()
586
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253 session.log("debug", "mod_smacks hibernation timeout reached...");
478
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254 -- We need to check the current resumption token for this resource
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255 -- matches the smacks session this timer is for in case it changed
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256 -- (for example, the client may have bound a new resource and
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parents: 345
diff changeset
257 -- started a new smacks session, or not be using smacks)
810
464ed063a8f2 mod_smacks: Less table indexing!
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diff changeset
258 local curr_session = full_sessions[session.full_jid];
987
fabff75bfc3f mod_smacks: If a hibernating session was destroyed before the timeout, don't destroy it again or say that it was resumed
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parents: 925
diff changeset
259 if false and session.destroyed then
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parents: 925
diff changeset
260 session.log("debug", "The session has already been destroyed");
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parents: 925
diff changeset
261 elseif curr_session and curr_session.resumption_token == resumption_token
345
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parents: 263
diff changeset
262 -- Check the hibernate time still matches what we think it is,
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parents: 263
diff changeset
263 -- otherwise the session resumed and re-hibernated.
478
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parents: 345
diff changeset
264 and session.hibernating == hibernate_time then
586
f733e7599ed6 mod_smacks: Add logging to hibernation and session destruction (thanks darkrain)
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parents: 576
diff changeset
265 session.log("debug", "Destroying session for hibernating too long");
345
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parents: 263
diff changeset
266 session_registry[session.resumption_token] = nil;
257
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parents: 256
diff changeset
267 session.resumption_token = nil;
345
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diff changeset
268 sessionmanager.destroy_session(session);
586
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parents: 576
diff changeset
269 else
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diff changeset
270 session.log("debug", "Session resumed before hibernation timeout, all is well")
257
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parents: 256
diff changeset
271 end
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parents: 256
diff changeset
272 end);
622
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diff changeset
273 return true; -- Postpone destruction for now
160
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274 end
1343
7dbde05b48a9 all the things: Remove trailing whitespace
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parents: 1325
diff changeset
275
160
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parents:
diff changeset
276 end
622
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diff changeset
277 end);
345
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parents: 263
diff changeset
278
1298
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parents: 1293
diff changeset
279 function handle_resume(session, stanza, xmlns_sm)
925
720b8268778e mod_smacks: Don't allow steam resumption onto a stream after resource binding
Kim Alvefur <zash@zash.se>
parents: 908
diff changeset
280 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
281 session.log("warn", "Tried to resume after resource binding");
1298
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parents: 1293
diff changeset
282 session.send(st.stanza("failed", { xmlns = xmlns_sm })
925
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parents: 908
diff changeset
283 :tag("unexpected-request", { xmlns = xmlns_errors })
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parents: 908
diff changeset
284 );
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parents: 908
diff changeset
285 return true;
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parents: 908
diff changeset
286 end
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parents: 908
diff changeset
287
345
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parents: 263
diff changeset
288 local id = stanza.attr.previd;
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parents: 263
diff changeset
289 local original_session = session_registry[id];
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parents: 263
diff changeset
290 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
291 session.log("debug", "Tried to resume non-existent session with id %s", id);
1298
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parents: 1293
diff changeset
292 session.send(st.stanza("failed", { xmlns = xmlns_sm })
345
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diff changeset
293 :tag("item-not-found", { xmlns = xmlns_errors })
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parents: 263
diff changeset
294 );
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parents: 263
diff changeset
295 elseif session.username == original_session.username
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parents: 263
diff changeset
296 and session.host == original_session.host then
587
322a14acd974 mod_smacks: Add log message on resume
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parents: 586
diff changeset
297 session.log("debug", "mod_smacks resuming existing session...");
345
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parents: 263
diff changeset
298 -- 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
299 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
300 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
301 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
302 c2s_sessions[conn] = nil;
623
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parents: 622
diff changeset
303 conn:close();
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parents: 622
diff changeset
304 end
345
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parents: 263
diff changeset
305 original_session.ip = session.ip;
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parents: 263
diff changeset
306 original_session.conn = session.conn;
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parents: 263
diff changeset
307 original_session.send = session.send;
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parents: 263
diff changeset
308 original_session.stream = session.stream;
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
309 original_session.secure = session.secure;
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
310 original_session.hibernating = nil;
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
311 local filter = original_session.filter;
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
312 local stream = session.stream;
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parents: 263
diff changeset
313 local log = session.log;
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parents: 263
diff changeset
314 function original_session.data(data)
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parents: 263
diff changeset
315 data = filter("bytes/in", data);
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
316 if data then
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parents: 263
diff changeset
317 local ok, err = stream:feed(data);
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
318 if ok then return; end
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319 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
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320 original_session:close("xml-not-well-formed");
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321 end
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322 end
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323 wrap_session(original_session, true, xmlns_sm);
345
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324 -- Inform xmppstream of the new session (passed to its callbacks)
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325 stream:set_session(original_session);
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326 -- Similar for connlisteners
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327 c2s_sessions[session.conn] = original_session;
345
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328
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329 session.send(st.stanza("resumed", { xmlns = xmlns_sm,
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330 h = original_session.handled_stanza_count, previd = id }));
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331
345
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332 -- Fake an <a> with the h of the <resume/> from the client
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333 original_session:dispatch_stanza(st.stanza("a", { xmlns = xmlns_sm,
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334 h = stanza.attr.h }));
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335
345
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336 -- Ok, we need to re-send any stanzas that the client didn't see
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337 -- ...they are what is now left in the outgoing stanza queue
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338 local queue = original_session.outgoing_stanza_queue;
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339 session.log("debug", "#queue = %d", #queue);
345
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340 for i=1,#queue do
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341 session.send(queue[i]);
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342 end
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343 session.log("debug", "#queue = %d -- after send", #queue);
345
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344 else
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345 module:log("warn", "Client %s@%s[%s] tried to resume stream for %s@%s[%s]",
345
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346 session.username or "?", session.host or "?", session.type,
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347 original_session.username or "?", original_session.host or "?", original_session.type);
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348 session.send(st.stanza("failed", { xmlns = xmlns_sm })
345
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349 :tag("not-authorized", { xmlns = xmlns_errors }));
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350 end
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351 return true;
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352 end
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353 module:hook_stanza(xmlns_sm2, "resume", function (session, stanza) return handle_resume(session, stanza, xmlns_sm2); end);
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354 module:hook_stanza(xmlns_sm3, "resume", function (session, stanza) return handle_resume(session, stanza, xmlns_sm3); end);