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module:set_global();
local async = require("prosody.util.async");
local active_hosts = {}
function module.add_host(host_module)
local last_run_times = host_module:open_store("cron", "map");
active_hosts[host_module.host] = true;
local function save_task(task, started_at)
last_run_times:set(nil, task.id, started_at);
end
local function restore_task(task)
if task.last == nil then
task.last = last_run_times:get(nil, task.id);
end
end
local function task_added(event)
local task = event.item;
if task.name == nil then task.name = task.when; end
if task.id == nil then
task.id = event.source.name .. "/" ..
task.name:gsub("%W", "_"):lower();
end
task.period = host_module:get_option_period(
task.id:gsub("/", "_") .. "_period", "1" .. task.when,
60, 86400 * 7 * 53);
task.restore = restore_task;
task.save = save_task;
module:log("debug", "%s task %s added", task.when, task.id);
return true
end
local function task_removed(event)
local task = event.item;
host_module:log("debug", "Task %s removed", task.id);
return true
end
host_module:handle_items("task", task_added, task_removed, true);
function host_module.unload() active_hosts[host_module.host] = nil; end
end
local function should_run(task, last)
return not last or last + task.period * 0.995 <= os.time()
end
local function run_task(task)
task:restore();
if not should_run(task, task.last) then return end
local started_at = os.time();
task:run(started_at);
task.last = started_at;
task:save(started_at);
end
local task_runner = async.runner(run_task);
scheduled = module:add_timer(1, function()
module:log("info", "Running periodic tasks");
local delay = 3600;
for host in pairs(active_hosts) do
module:log("debug", "Running periodic tasks for host %s", host);
for _, task in ipairs(module:context(host):get_host_items("task")) do
task_runner:run(task);
end
end
module:log("debug", "Wait %ds", delay);
return delay
end);
module:add_item("shell-command", {
section = "cron",
section_desc = "View and manage recurring tasks",
name = "tasks",
desc = "View registered tasks",
args = {},
handler = function(self, filter_host)
local format_table = require("prosody.util.human.io").table;
local it = require("util.iterators");
local row = format_table({
{title = "Host", width = "2p"}, {title = "Task", width = "3p"},
{title = "Desc", width = "3p"}, {title = "When", width = "1p"},
{title = "Last run", width = "20"}
}, self.session.width);
local print = self.session.print;
print(row());
for host in it.sorted_pairs(filter_host and {[filter_host] = true} or
active_hosts) do
for _, task in ipairs(module:context(host):get_host_items("task")) do
print(row({
host, task.id, task.name, task.when,
task.last and os.date("%Y-%m-%d %R:%S", task.last) or
"never"
}));
end
end
end
});
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