prosody
658b759a1f7a
plugins/mod_carbons.lua

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plugins/mod_carbons.lua @ 10469:658b759a1f7a

mod_carbons: Improve performance by delaying creation of carbon payload If there are no other sessions which also enabled carbons then the carbons wrapper is not used and the potentially expensive clone operation was a waste of cycles.
author Kim Alvefur <zash@zash.se>
date Sat, 30 Nov 2019 19:34:40 +0100
parent 8354:b41947a0fc0c
child 10778:a62b981db0e2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 -- XEP-0280: Message Carbons implementation for Prosody
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2 -- Copyright (C) 2011-2016 Kim Alvefur
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3 --
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4 -- This file is MIT/X11 licensed.
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5
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6 local st = require "util.stanza";
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7 local jid_bare = require "util.jid".bare;
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8 local xmlns_carbons = "urn:xmpp:carbons:2";
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9 local xmlns_forward = "urn:xmpp:forward:0";
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10 local full_sessions, bare_sessions = prosody.full_sessions, prosody.bare_sessions;
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11
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12 local function toggle_carbons(event)
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13 local origin, stanza = event.origin, event.stanza;
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14 local state = stanza.tags[1].name;
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15 module:log("debug", "%s %sd carbons", origin.full_jid, state);
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16 origin.want_carbons = state == "enable" and stanza.tags[1].attr.xmlns;
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17 origin.send(st.reply(stanza));
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18 return true;
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19 end
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20 module:hook("iq-set/self/"..xmlns_carbons..":disable", toggle_carbons);
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21 module:hook("iq-set/self/"..xmlns_carbons..":enable", toggle_carbons);
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22
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23 local function message_handler(event, c2s)
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24 local origin, stanza = event.origin, event.stanza;
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25 local orig_type = stanza.attr.type or "normal";
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26 local orig_from = stanza.attr.from;
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27 local bare_from = jid_bare(orig_from);
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28 local orig_to = stanza.attr.to;
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29 local bare_to = jid_bare(orig_to);
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30
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31 if not(orig_type == "chat" or (orig_type == "normal" and stanza:get_child("body"))) then
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32 return -- Only chat type messages
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33 end
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34
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35 -- Stanza sent by a local client
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36 local bare_jid = bare_from; -- JID of the local user
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37 local target_session = origin;
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38 local top_priority = false;
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39 local user_sessions = bare_sessions[bare_from];
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40
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41 -- Stanza about to be delivered to a local client
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42 if not c2s then
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43 bare_jid = bare_to;
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44 target_session = full_sessions[orig_to];
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45 user_sessions = bare_sessions[bare_jid];
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46 if not target_session and user_sessions then
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47 -- The top resources will already receive this message per normal routing rules,
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48 -- so we are going to skip them in order to avoid sending duplicated messages.
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49 local top_resources = user_sessions.top_resources;
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50 top_priority = top_resources and top_resources[1].priority
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51 end
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52 end
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53
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54 if not user_sessions then
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55 module:log("debug", "Skip carbons for offline user");
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56 return -- No use in sending carbons to an offline user
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57 end
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58
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59 if stanza:get_child("private", xmlns_carbons) then
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60 if not c2s then
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61 stanza:maptags(function(tag)
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62 if not ( tag.attr.xmlns == xmlns_carbons and tag.name == "private" ) then
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63 return tag;
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64 end
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65 end);
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66 end
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67 module:log("debug", "Message tagged private, ignoring");
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68 return
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69 elseif stanza:get_child("no-copy", "urn:xmpp:hints") then
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70 module:log("debug", "Message has no-copy hint, ignoring");
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71 return
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72 elseif not c2s and bare_jid == orig_from and stanza:get_child("x", "http://jabber.org/protocol/muc#user") then
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73 module:log("debug", "MUC PM, ignoring");
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74 return
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75 end
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76
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77 local carbon;
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78 user_sessions = user_sessions and user_sessions.sessions;
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79 for _, session in pairs(user_sessions) do
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80 -- Carbons are sent to resources that have enabled it
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81 if session.want_carbons
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82 -- but not the resource that sent the message, or the one that it's directed to
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83 and session ~= target_session
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84 -- and isn't among the top resources that would receive the message per standard routing rules
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85 and (c2s or session.priority ~= top_priority) then
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86 if not carbon then
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87 -- Create the carbon copy and wrap it as per the Stanza Forwarding XEP
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88 local copy = st.clone(stanza);
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89 if c2s and not orig_to then
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90 stanza.attr.to = bare_from;
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91 end
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92 copy.attr.xmlns = "jabber:client";
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93 carbon = st.message{ from = bare_jid, type = orig_type, }
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94 :tag(c2s and "sent" or "received", { xmlns = xmlns_carbons })
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95 :tag("forwarded", { xmlns = xmlns_forward })
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96 :add_child(copy):reset();
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97
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98 end
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99
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100 carbon.attr.to = session.full_jid;
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101 module:log("debug", "Sending carbon to %s", session.full_jid);
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102 session.send(carbon);
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103 end
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104 end
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105 end
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106
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107 local function c2s_message_handler(event)
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108 return message_handler(event, true)
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109 end
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110
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111 -- Stanzas sent by local clients
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c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
112 module:hook("pre-message/host", c2s_message_handler, -0.5);
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
113 module:hook("pre-message/bare", c2s_message_handler, -0.5);
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
114 module:hook("pre-message/full", c2s_message_handler, -0.5);
6546
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
115 -- Stanzas to local clients
7718
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
116 module:hook("message/bare", message_handler, -0.5);
c58075c4d375 mod_message, mod_carbons: Adjust event hook priorities to negative (core modules should do this to make overriding from other modules easier)
Kim Alvefur <zash@zash.se>
parents: 7698
diff changeset
117 module:hook("message/full", message_handler, -0.5);
6546
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
118
3426e903c48d mod_carbons: Import XEP-0280 implementation from prosody-modules (sans compat with older versions of the protocol)
Kim Alvefur <zash@zash.se>
parents:
diff changeset
119 module:add_feature(xmlns_carbons);