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annotate mod_s2s_keepalive/mod_s2s_keepalive.lua @ 3765:11878130f266

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mod_s2s_keepalive: Use a watchdog to close unresponsive sessions (fixes #1457)
author Kim Alvefur <zash@zash.se>
date Sat, 21 Dec 2019 17:52:32 +0100
parents 07a1faa24261
children f547eafb5a6d
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1 local st = require "util.stanza";
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2 local watchdog = require "util.watchdog";
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4 local keepalive_servers = module:get_option_set("keepalive_servers");
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5 local keepalive_interval = module:get_option_number("keepalive_interval", 60);
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6 local keepalive_timeout = module:get_option_number("keepalive_timeout", 593);
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8 local host = module.host;
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9 local s2sout = prosody.hosts[host].s2sout;
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11 local function send_pings()
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12 local ping_hosts = {};
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13
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14 for remote_domain, session in pairs(s2sout) do
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15 if session.type == "s2sout" -- as opposed to _unauthed
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16 and (not(keepalive_servers) or keepalive_servers:contains(remote_domain)) then
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17 session.sends2s(st.iq({ to = remote_domain, type = "get", from = host, id = "keepalive" })
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18 :tag("ping", { xmlns = "urn:xmpp:ping" })
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19 );
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20 end
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21 end
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22
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23 for session in pairs(prosody.incoming_s2s) do
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24 if session.type == "s2sin" -- as opposed to _unauthed
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25 and (not(keepalive_servers) or keepalive_servers:contains(session.from_host)) then
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26 if not s2sout[session.from_host] then ping_hosts[session.from_host] = true; end
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27 session.sends2s " ";
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28 -- If the connection is dead, this should make it time out.
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29 end
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30 end
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31
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32 -- ping remotes we only have s2sin from
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33 for remote_domain in pairs(ping_hosts) do
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34 module:send(st.iq({ to = remote_domain, type = "get", from = host, id = "keepalive" })
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35 :tag("ping", { xmlns = "urn:xmpp:ping" })
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36 );
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37 end
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38
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39 return keepalive_interval;
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40 end
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41
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42 module:hook("s2sin-established", function (event)
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43 local session = event.session;
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44 if session.watchdog_keepalive then return end -- in case mod_bidi fires this twice
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45 session.watchdog_keepalive = watchdog.new(keepalive_timeout, function ()
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46 session.log("info", "Keepalive ping timed out, closing connection");
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47 session:close("connection-timeout");
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48 end);
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49 end);
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50
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51 module:hook("s2sout-established", function (event)
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52 local session = event.session;
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53 if session.watchdog_keepalive then return end -- in case mod_bidi fires this twice
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54 session.watchdog_keepalive = watchdog.new(keepalive_timeout, function ()
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55 session.log("info", "Keepalive ping timed out, closing connection");
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56 session:close("connection-timeout");
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57 end);
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58 end);
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59
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60 module:hook("iq-result/host/keepalive", function (event)
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61 local origin = event.origin;
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62 if origin.watchdog_keepalive then
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63 origin.watchdog_keepalive:reset();
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64 end
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65 if s2sout[origin.from_host] then
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66 s2sout[origin.from_host]:reset();
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67 end
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68 end);
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69
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70 module:hook("iq-error/host/keepalive", function (event)
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71 local origin = event.origin;
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72 if origin.dummy then return end -- Probably a sendq bounce
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73
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74 if origin.type == "s2sin" or origin.type == "s2sout" then
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75 -- An error from the remote means connectivity is ok,
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76 -- so treat it the same as a result
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77 return module:fire_event("iq-result/host/keepalive");
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78 end
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79 end);
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80
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81 module:add_timer(keepalive_interval, send_pings);