prosody-modules
c7a5caad28ef
mod_http_host_status_check/mod_http_host_status_check.lua

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mod_http_host_status_check/mod_http_host_status_check.lua @ 5405:c7a5caad28ef

mod_http_oauth2: Enforce response type encoded in client_id The client promises to only use this response type, so we should hold them to that. This makes it fail earlier if the response type is disabled or the client is trying to use one that it promised not to use. Better than failing after login and consent.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:31:25 +0200
parent 2765:85cf9a8b4020
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1 local heartbeats = module:shared("/*/host_status_check/heartbeats");
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2 local events = module:shared("/*/host_status_check/connection_events");
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3 local host_status_ok = module:shared("host_status_ok");
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5 local time = require "socket".gettime;
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6 local template = require "util.interpolation".new("%b{}", function (s) return s end)
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7
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8 module:depends "http"
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9
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10 local threshold = module:get_option_number("status_check_heartbeat_threshold", 10);
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12 local function status_string(status, duration, comment)
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13 local string_timestamp;
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14 if duration then
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15 string_timestamp = ("(%0.2fs%s)"):format(duration, comment or "");
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16 elseif comment then
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17 string_timestamp = ("(%s)"):format(comment);
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18 else
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19 return status and "UP" or "DOWN";
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20 end
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21 return (status and "UP " or "DOWN ")..string_timestamp;
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22 end
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24 local function string_pad(s, len)
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25 return s..(" "):rep(len-#s);
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26 end
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28 local status_page_template = [[
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29 STATUS {status}
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30 {host_statuses%HOST {item} {idx}
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31 }]];
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32
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33 function status_page()
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34 local host_statuses = {};
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35 local current_time = time();
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37 local all_ok = true;
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38 local failed_hosts = {};
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40 for host in pairs(hosts) do
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41 local last_heartbeat_time = heartbeats[host];
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42
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43 local ok, status_text = true;
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45 local is_component = hosts[host].type == "component" and hosts[host].modules.component;
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46
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47 if is_component then
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48 local current_status = hosts[host].modules.component.connected;
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49 if events[host] then
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50 local tracked_status = events[host].connected;
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51 if tracked_status == current_status then
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52 status_text = status_string(current_status, time() - events[host].timestamp);
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53 else
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54 status_text = status_string(current_status, nil, "!");
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55 end
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56 else
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57 status_text = status_string(current_status, nil, "?");
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58 end
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59 if not current_status then
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60 ok = false;
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61 end
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62 else
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63 local event_info = events[host];
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64 local connected = true;
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65 if event_info then
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66 connected = event_info.connected;
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67 end
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68 status_text = status_string(connected, event_info and (time() - events[host].timestamp), not event_info and "?");
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69 end
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70
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71 if last_heartbeat_time then
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72 local time_since_heartbeat = current_time - last_heartbeat_time;
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73 if ok then
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74 if time_since_heartbeat > threshold then
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75 status_text = ("TIMEOUT (%0.2fs)"):format(time_since_heartbeat);
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76 ok = false;
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77 else
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78 status_text = status_text:gsub("^%S+", "GOOD");
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79 end
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80 end
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81 end
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82
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83 if not ok then
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84 all_ok = false;
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85 table.insert(failed_hosts, host);
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86 end
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87
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88 if not ok or is_component or last_heartbeat_time then
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89 host_statuses[host] = string_pad(status_text, 20);
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90 end
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91 local last_ok = host_status_ok[host];
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92 if last_ok ~= ok then
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93 if last_ok ~= nil then
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94 module:log("warn", "Host status check %s (%s)", ok and "OK" or "FAILED", status_text);
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95 end
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96 host_status_ok[host] = ok;
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97 end
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98 end
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99 local page = template(status_page_template, {
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100 status = all_ok and "OK" or ("FAIL: "..table.concat(failed_hosts, ", "));
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101 host_statuses = host_statuses;
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102 });
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103 return page;
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104 end
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105
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106 module:provides("http", {
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107 route = {
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108 GET = status_page;
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109 };
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110 })