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teal-src/plugins/mod_cron.tl

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teal-src/plugins/mod_cron.tl @ 12491:dc0c20753d6c 0.12

mod_invites_adhoc: Fall back to generic allow_user_invites for role-less users Fixes #1752
author Matthew Wild <mwild1@gmail.com>
date Fri, 06 May 2022 17:08:49 +0100
parent 12489:8b42575738f0
child 12498:c3e47a5dd30d
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rev   line source
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1 module:set_global();
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2
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3 local async = require "util.async";
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4 local datetime = require "util.datetime";
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5
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6 local record map_store<K,V>
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7 -- TODO move to somewhere sensible
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8 get : function (map_store<K,V>, string, K) : V
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9 set : function (map_store<K,V>, string, K, V)
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10 end
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11
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12 local enum frequency
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13 "hourly"
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14 "daily"
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15 "weekly"
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16 end
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17
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18 local record task_spec
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19 id : string -- unique id
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20 name : string -- name or short description
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21 when : frequency
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22 last : integer
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23 run : function (task_spec, integer)
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24 save : function (task_spec, integer)
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25 end
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26
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27 local record task_event
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28 source : module
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29 item : task_spec
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30 end
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31
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32 local periods : { frequency : integer } = { hourly = 3600, daily = 86400, weekly = 7*86400 }
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33
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34 local active_hosts : { string : boolean } = { }
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35
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36 function module.add_host(host_module : moduleapi)
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37
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38 local last_run_times = host_module:open_store("cron", "map") as map_store<string,integer>;
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39 active_hosts[host_module.host] = true;
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40
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41 local function save_task(task : task_spec, started_at : integer)
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42 last_run_times:set(nil, task.id, started_at);
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43 end
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44
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45 local function task_added(event : task_event) : boolean
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46 local task = event.item;
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47 if task.name == nil then
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48 task.name = task.when;
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49 end
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50 if task.id == nil then
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51 task.id = event.source.name .. "/" .. task.name:gsub("%W", "_"):lower();
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52 end
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53 if task.last == nil then
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54 task.last = last_run_times:get(nil, task.id);
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55 end
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56 task.save = save_task;
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57 module:log("debug", "%s task %s added, last run %s", task.when, task.id,
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58 task.last and datetime.datetime(task.last) or "never");
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59 if task.last == nil then
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60 -- initialize new tasks so e.g. daily tasks run at ~midnight UTC for now
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61 local now = os.time();
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62 task.last = now - now % periods[task.when];
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63 end
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64 return true;
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65 end
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66
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67 local function task_removed(event : task_event) : boolean
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68 local task = event.item;
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69 host_module:log("debug", "Task %s removed", task.id);
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70 return true;
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71 end
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72
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73 host_module:handle_items("task", task_added, task_removed, true);
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74
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75 function host_module.unload()
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76 active_hosts[host_module.host]=nil;
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77 end
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78 end
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79
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80 local function should_run(when : frequency, last : integer) : boolean
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81 return not last or last + periods[when]*0.995 <= os.time();
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82 end
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83
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84 local function run_task(task : task_spec)
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85 local started_at = os.time();
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86 task:run(started_at);
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87 task.last = started_at;
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88 task:save(started_at);
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89 end
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90
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91 local task_runner = async.runner(run_task);
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92 module:add_timer(1, function() : integer
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93 module:log("info", "Running periodic tasks");
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94 local delay = 3600;
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95 for host in pairs(active_hosts) do
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96 module:log("debug", "Running periodic tasks for host %s", host);
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97 for _, task in ipairs(module:context(host):get_host_items("task") as { task_spec } ) do
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98 module:log("debug", "Considering %s task %s (%s)", task.when, task.id, task.run);
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99 if should_run(task.when, task.last) then task_runner:run(task); end
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100 end
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101 end
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102 module:log("debug", "Wait %ds", delay);
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103 return delay;
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104 end);
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105
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106 -- TODO measure load, pick a good time to do stuff