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annotate mod_http_host_status_check/mod_http_host_status_check.lua @ 2219:5fcf9d558250

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Three new modules: mod_host_status_check, mod_host_status_heartbeat and mod_http_host_status_check
author Matthew Wild <mwild1@gmail.com>
date Tue, 28 Jun 2016 22:33:13 +0100
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children 7356d722e180
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5fcf9d558250 Three new modules: mod_host_status_check, mod_host_status_heartbeat and mod_http_host_status_check
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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
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4 local time = require "socket".gettime;
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5 local template = require "util.interpolation".new("%b{}", function (s) return s end)
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6 local st = require "util.stanza";
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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", 5);
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11
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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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23
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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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27
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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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36
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37 local all_ok = true;
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38
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39 for host in pairs(hosts) do
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40 local last_heartbeat_time = heartbeats[host];
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41
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42 local ok, status_text = true, "OK";
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44 local is_component = hosts[host].type == "component" and hosts[host].modules.component;
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45
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46 if is_component then
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47 local current_status = hosts[host].modules.component.connected;
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48 if events[host] then
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49 local tracked_status = events[host].connected;
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50 if tracked_status == current_status then
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51 status_text = status_string(current_status, time() - events[host].timestamp);
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52 else
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53 status_text = status_string(current_status, nil, "!");
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54 end
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55 else
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56 status_text = status_string(current_status, nil, "?");
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57 end
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58 if not current_status then
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59 ok = false;
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60 end
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61 else
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62 local event_info = events[host];
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63 local connected = true;
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64 if event_info then
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65 connected = event_info.connected;
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66 end
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67 status_text = status_string(connected, event_info and (time() - events[host].timestamp), not event_info and "?");
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68 end
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69
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70 if last_heartbeat_time then
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71 local time_since_heartbeat = current_time - last_heartbeat_time;
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72 if ok then
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73 if time_since_heartbeat > threshold then
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74 status_text = ("TIMEOUT (%0.2fs)"):format(time_since_heartbeat);
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75 ok = false;
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76 else
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77 status_text = status_text:gsub("^%S+", "GOOD");
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78 end
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79 end
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80 end
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81
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82 if not ok then
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83 all_ok = false;
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84 end
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85
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86 if not ok or is_component or last_heartbeat_time then
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87 host_statuses[host] = string_pad(status_text, 20);
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88 end
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89 end
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90 local page = template(status_page_template, {
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91 status = all_ok and "OK" or "FAIL";
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92 host_statuses = host_statuses;
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93 });
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94 return page;
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95 end
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96
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97 module:provides("http", {
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98 route = {
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99 GET = status_page;
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100 };
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101 })