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107 lines
2.8 KiB
Text
107 lines
2.8 KiB
Text
module:set_global();
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local async = require "prosody.util.async";
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local record map_store<K,V>
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-- TODO move to somewhere sensible
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get : function (map_store<K,V>, string, K) : V
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set : function (map_store<K,V>, string, K, V)
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end
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local enum frequency
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"hourly"
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"daily"
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"weekly"
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end
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local record task_spec
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id : string -- unique id
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name : string -- name or short description
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when : frequency
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period : number
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last : integer
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run : function (task_spec, integer)
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save : function (task_spec, integer)
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restore : function (task_spec, integer)
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end
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local record task_event
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source : module
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item : task_spec
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end
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local active_hosts : { string : boolean } = { }
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function module.add_host(host_module : moduleapi)
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local last_run_times = host_module:open_store("cron", "map") as map_store<string,integer>;
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active_hosts[host_module.host] = true;
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local function save_task(task : task_spec, started_at : integer)
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last_run_times:set(nil, task.id, started_at);
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end
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local function restore_task(task : task_spec)
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if task.last == nil then
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task.last = last_run_times:get(nil, task.id);
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end
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end
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local function task_added(event : task_event) : boolean
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local task = event.item;
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if task.name == nil then
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task.name = task.when;
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end
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if task.id == nil then
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task.id = event.source.name .. "/" .. task.name:gsub("%W", "_"):lower();
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end
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task.period = host_module:get_option_period(task.id:gsub("/", "_") .. "_period", "1" .. task.when, 60, 86400*7*53);
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task.restore = restore_task;
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task.save = save_task;
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module:log("debug", "%s task %s added", task.when, task.id);
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return true;
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end
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local function task_removed(event : task_event) : boolean
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local task = event.item;
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host_module:log("debug", "Task %s removed", task.id);
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return true;
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end
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host_module:handle_items("task", task_added, task_removed, true);
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function host_module.unload()
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active_hosts[host_module.host]=nil;
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end
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end
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local function should_run(task : task_spec, last : integer) : boolean
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return not last or last + task.period * 0.995 <= os.time();
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end
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local function run_task(task : task_spec)
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task:restore();
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if not should_run(task, task.last) then
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return;
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end
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local started_at = os.time();
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task:run(started_at);
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task.last = started_at;
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task:save(started_at);
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end
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local task_runner : async.runner_t<task_spec> = async.runner(run_task);
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scheduled = module:add_timer(1, function() : integer
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module:log("info", "Running periodic tasks");
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local delay = 3600;
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for host in pairs(active_hosts) do
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module:log("debug", "Running periodic tasks for host %s", host);
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for _, task in ipairs(module:context(host):get_host_items("task") as { task_spec } ) do
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task_runner:run(task);
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end
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end
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module:log("debug", "Wait %ds", delay);
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return delay;
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end);
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-- TODO measure load, pick a good time to do stuff
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