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annotate mod_s2s_cache_failures/mod_s2s_cache_failures.lua @ 6515:ff55e93be449

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mod_http_oauth2: Normalize username in password grant Otherwise authentication may fail if provided a non-normalized username Introduced in c1b94dd6e53b
author Kim Alvefur <zash@zash.se>
date Wed, 08 Apr 2026 23:08:39 +0200
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 });