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annotate mod_http_host_status_check/mod_http_host_status_check.lua @ 5342:e28ba69b5307

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mod_rest: Implement use of refresh tokens in rest.sh example Because having access tokens expire daily was becoming annoying. Now this is starting to be in dire need of refactoring.
author Kim Alvefur <zash@zash.se>
date Wed, 12 Apr 2023 11:24:50 +0200
parents 85cf9a8b4020
children
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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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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 })