1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
-- Copyright (C) 2016-2020 Kim Alvefur
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:depends"csi"
local jid = require "util.jid";
local st = require "util.stanza";
local dt = require "util.datetime";
local filters = require "util.filters";
local queue_size = module:get_option_number("csi_queue_size", 256);
local important_payloads = module:get_option_set("csi_important_payloads", { });
function is_important(stanza) --> boolean, reason: string
if not st.is_stanza(stanza) then
-- whitespace pings etc
return true;
end
if stanza.attr.xmlns ~= nil then
-- stream errors, stream management etc
return true, "nonza";
end
local st_name = stanza.name;
if not st_name then return false; end
local st_type = stanza.attr.type;
if st_name == "presence" then
if st_type == nil or st_type == "unavailable" or st_type == "error" then
return false, "presence update";
end
-- TODO Some MUC awareness, e.g. check for the 'this relates to you' status code
return true, "subscription request";
elseif st_name == "message" then
if st_type == "headline" then
-- Headline messages are ephemeral by definition
return false, "headline";
end
if st_type == "error" then
return true, "delivery failure";
end
if stanza:get_child("sent", "urn:xmpp:carbons:2") then
return true, "carbon";
end
local forwarded = stanza:find("{urn:xmpp:carbons:2}received/{urn:xmpp:forward:0}/{jabber:client}message");
if forwarded then
stanza = forwarded;
end
if stanza:get_child("body") then
return true, "body";
end
if stanza:get_child("subject") then
-- Last step of a MUC join
return true, "subject";
end
if stanza:get_child("encryption", "urn:xmpp:eme:0") then
-- Since we can't know what an encrypted message contains, we assume it's important
-- XXX Experimental XEP
return true, "encrypted";
end
if stanza:get_child("x", "jabber:x:conference") or stanza:find("{http://jabber.org/protocol/muc#user}x/invite") then
return true, "invite";
end
if stanza:get_child(nil, "urn:xmpp:jingle-message:0") then
-- XXX Experimental XEP stuck in Proposed for almost a year at the time of this comment
return true, "jingle call";
end
for important in important_payloads do
if stanza:find(important) then
return true;
end
end
return false;
elseif st_name == "iq" then
return true;
end
end
module:hook("csi-is-stanza-important", function (event)
local important, why = is_important(event.stanza);
event.reason = why;
return important;
end, -1);
local function should_flush(stanza, session, ctr) --> boolean, reason: string
if ctr >= queue_size then
return true, "queue size limit reached";
end
local event = { stanza = stanza, session = session };
local ret = module:fire_event("csi-is-stanza-important", event)
return ret, event.reason;
end
local function with_timestamp(stanza, from)
if st.is_stanza(stanza) and stanza.attr.xmlns == nil and stanza.name ~= "iq" then
stanza = st.clone(stanza);
stanza:add_direct_child(st.stanza("delay", {xmlns = "urn:xmpp:delay", from = from, stamp = dt.datetime()}));
end
return stanza;
end
local measure_buffer_hold = module:measure("buffer_hold", "times");
local function manage_buffer(stanza, session)
local ctr = session.csi_counter or 0;
local flush, why = should_flush(stanza, session, ctr);
if flush then
if session.csi_measure_buffer_hold then
session.csi_measure_buffer_hold();
session.csi_measure_buffer_hold = nil;
end
session.log("debug", "Flushing buffer (%s; queue size is %d)", why or "important", session.csi_counter);
session.conn:resume_writes();
else
session.log("debug", "Holding buffer (%s; queue size is %d)", why or "unimportant", session.csi_counter);
stanza = with_timestamp(stanza, jid.join(session.username, session.host))
end
session.csi_counter = ctr + 1;
return stanza;
end
local function flush_buffer(data, session)
session.log("debug", "Flushing buffer (%s; queue size is %d)", "client activity", session.csi_counter);
if session.csi_measure_buffer_hold then
session.csi_measure_buffer_hold();
session.csi_measure_buffer_hold = nil;
end
session.conn:resume_writes();
return data;
end
function enable_optimizations(session)
if session.conn and session.conn.pause_writes then
session.conn:pause_writes();
session.csi_measure_buffer_hold = measure_buffer_hold();
session.csi_counter = 0;
filters.add_filter(session, "stanzas/out", manage_buffer);
filters.add_filter(session, "bytes/in", flush_buffer);
else
session.log("warn", "Session connection does not support write pausing");
end
end
function disable_optimizations(session)
filters.remove_filter(session, "stanzas/out", manage_buffer);
filters.remove_filter(session, "bytes/in", flush_buffer);
session.csi_counter = nil;
if session.csi_measure_buffer_hold then
session.csi_measure_buffer_hold();
session.csi_measure_buffer_hold = nil;
end
if session.conn and session.conn.resume_writes then
session.conn:resume_writes();
end
end
module:hook("csi-client-inactive", function (event)
local session = event.origin;
enable_optimizations(session);
end);
module:hook("csi-client-active", function (event)
local session = event.origin;
disable_optimizations(session);
end);
module:hook("pre-resource-unbind", function (event)
local session = event.session;
disable_optimizations(session);
end, 1);
module:hook("c2s-ondrain", function (event)
local session = event.session;
if session.state == "inactive" and session.conn and session.conn.pause_writes then
session.conn:pause_writes();
session.csi_measure_buffer_hold = measure_buffer_hold();
session.log("debug", "Buffer flushed, resuming inactive mode (queue size was %d)", session.csi_counter);
session.csi_counter = 0;
end
end);
function module.load()
for _, user_session in pairs(prosody.hosts[module.host].sessions) do
for _, session in pairs(user_session.sessions) do
if session.state == "inactive" then
enable_optimizations(session);
end
end
end
end
function module.unload()
for _, user_session in pairs(prosody.hosts[module.host].sessions) do
for _, session in pairs(user_session.sessions) do
if session.state == "inactive" then
disable_optimizations(session);
end
end
end
end
|
