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annotate mod_s2s_cache_failures/mod_s2s_cache_failures.lua @ 6556:7477e97a9045

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mod_firewall: Apply pre-reload state before re-reading config This change makes load/reload a bit more robust. module.load() runs before module.restore() and it reads from the config and updates the state (if needed). However, after this, module.restore() could run and apply the old state again.
author Matthew Wild <mwild1@gmail.com>
date Sun, 24 May 2026 20:03:20 +0100
parents 7ed4627ba65d
children
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1 module:set_global();
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2
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3 local cache = require "prosody.util.cache";
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4 local st = require "prosody.util.stanza";
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5 local time = require "prosody.util.time";
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6
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7 local measure_failed_domains = module:metric(
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8 "gauge", "failed_domains", "",
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9 "Number of cached domain failures"
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10 );
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11
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12 local measure_rejected_stanzas = module:metric(
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13 "counter", "failed_stanzas", "",
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14 "Number of rejected stanzas to failed domains"
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15 );
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16
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17 local failed_domains_cache_size = module:get_option_number("s2s_failure_cache_size", 128);
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18
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19 local domains = cache.new(failed_domains_cache_size);
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20
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21 -- This function returns an appropriate delay until we should retry connecting
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22 -- It includes randomness, so that every Prosody server does not attempt
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23 -- to reconnect to the target server at the same time (which may overload it
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24 -- and cause further downtime). The logic and numbers here results in approximately
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25 -- 15 retries per hour, with up to 30min between attempts.
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26 local function get_holdoff_time(first_disconnect, last_disconnect)
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27 -- Retry for a server that has been down for 2 hours will be the same
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28 -- range as a server that has been down for 1 hour
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29 local downtime = math.min(3600, last_disconnect - first_disconnect);
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30 -- Range from at least 10-20s up to a range proportional to the downtime
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31 return math.random(10 + downtime/4, 20 + downtime/2);
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32 end
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33
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34 module:hook("s2sout-established", function (event)
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35 -- Successfully connected, so stop tracking this domain
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36 local domain = event.session.to_host;
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37 domains:set(domain, nil);
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38 end);
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39
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40 module:hook("s2sout-destroyed", function (event)
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41 local domain = event.session.to_host;
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42 if not event.reason or event.session.type ~= "s2sout_unauthed" then
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43 return;
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44 end
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45 local current_time = time.now();
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46 local holdoff_time = get_holdoff_time(current_time, current_time);
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47 local state = domains:get(domain) or { current_time, nil, -1, current_time + holdoff_time, event.reason };
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48 state[2], state[3] = current_time, state[3] + 1;
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49 domains:set(domain, state);
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50 module:log("info", "Preventing further connections to %s for %d seconds", holdoff_time);
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51 end);
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52
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53 module:hook("route/remote", function (event)
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54 local origin, stanza, domain = event.origin, event.stanza, event.to_host;
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55 local domain_info = domains:get(domain);
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56 if domain_info then
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57 measure_rejected_stanzas:add(1);
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58 local holdoff_until = domain_info[4];
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59 if time.now() < holdoff_until then
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60 return;
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61 end
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62 local reply = st.error_reply(
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63 stanza,
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64 "wait",
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65 "remote-server-timeout",
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66 domain_info[5] and ("Unreachable domain ("..domain_info[5]..")") or "Unreachable domain"
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67 );
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68 return origin.send(reply);
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69 end
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70 end);
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71
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72 module:hook("stats-update", function ()
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73 measure_failed_domains:with_labels():set(domains:count());
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74 end);
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75
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76 module:add_item("shell-command", {
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77 section = "s2s";
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78 section_desc = "View and manage server-to-server connections";
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79 name = "reset_failures";
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80 desc = "Clear cache of connection failures";
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81 args = {
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82 { name = "remote_host", type = "string" };
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83 };
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84 handler = function (_, remote_host)
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85 if remote_host then
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86 if domains:get(remote_host) == nil then
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87 return false, "No failure cached for "..remote_host;
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88 end
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89 domains:set(remote_host, nil);
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90 return true, "Reset failure cache for "..remote_host;
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91 end
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92
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93 -- No remote host specified, so clear all
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94 domains:clear();
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95 return true, "Failure cache cleared";
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96 end;
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97 });
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98
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99 module:add_item("shell-command", {
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100 section = "s2s";
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101 section_desc = "View and manage server-to-server connections";
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102 name = "show_failures";
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103 desc = "Show cache of connection failures";
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104 args = {
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105 { name = "remote_host", type = "string" };
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106 };
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107 handler = function (shell, remote_host)
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108 local function show_domain_failures(domain, domain_info)
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109 domain_info = domain_info or domains:get(domain);
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110 if not domain_info then
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111 return false;
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112 end
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113 local first_disconnect, last_disconnect = domain_info[1], domain_info[2];
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114 local attempts, holdoff, reason = domain_info[3], domain_info[4], domain_info[5];
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115
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116 shell.session.print(domain..":");
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117 shell.session.print(" First disconnected: "..os.date("%c", first_disconnect));
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118 shell.session.print(" Last disconnected: "..os.date("%c", last_disconnect));
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119 if reason then
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120 shell.session.print(" because: "..reason);
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121 end
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122 shell.session.print(" Reconnection attempts: "..attempts);
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123 shell.session.print(" No more attempts until: "..os.date("%c", last_disconnect + holdoff));
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124
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125 return true;
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126 end
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127 if remote_host then
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128 if not show_domain_failures(remote_host) then
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129 return false, "No failure cached for "..remote_host;
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130 end
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131 return true, "Showing failure record for "..remote_host;
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132 end
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133
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134 local c = 0;
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135 for domain, domain_info in domains:items() do
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136 c = c + 1;
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137 show_domain_failures(domain, domain_info);
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138 end
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139
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140 return true, ("Showing %d failure records"):format(c);
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141 end;
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142 });