working switching station off-delay

technic/machines/switching_station_globalstep.lua

@@ -1,11 +1,78 @@
 
+local has_monitoring_mod = minetest.get_modpath("monitoring")
+
+local switches = {} -- pos_hash -> time_us
+
+local active_switching_stations_metric, switching_stations_usage_metric
+
+if has_monitoring_mod then
+	active_switching_stations_metric = monitoring.gauge(
+		"technic_active_switching_stations",
+		"Number of active switching stations"
+	)
+
+	switching_stations_usage_metric = monitoring.counter(
+		"technic_switching_stations_usage",
+		"usage in microseconds cpu time"
+	)
+end
+
 
 minetest.register_abm({
 	nodenames = {"technic:switching_station"},
 	label = "Switching Station",
-	interval   = 1.1,
+	interval   = 1,
 	chance     = 1,
-	action = function(pos, node, active_object_count, active_object_count_wider)
-		technic.switching_station_run(pos)
+	action = function(pos)
+		local hash = minetest.hash_node_position(pos)
+		local time_us = minetest.get_us_time()
+		switches[hash] = time_us
 	end
 })
+
+local off_delay_seconds = 600
+
+local timer = 0
+minetest.register_globalstep(function(dtime)
+	timer = timer + dtime
+	if timer < 1.0 then
+		return
+	end
+	timer = 0
+
+	local now = minetest.get_us_time()
+	local off_delay_micros = off_delay_seconds*1000*1000
+	local active_switches = 0
+
+	for hash, time_us in pairs(switches) do
+		local pos = minetest.get_position_from_hash(hash)
+		local diff = now - time_us
+
+		minetest.get_voxel_manip(pos, pos)
+		local node = minetest.get_node(pos)
+
+		if node.name ~= "technic:switching_station" then
+			-- station vanished
+			switches[hash] = nil
+
+		elseif diff < off_delay_micros then
+			-- station active
+			active_switches = active_switches + 1
+			technic.switching_station_run(pos)
+
+		else
+			-- station timed out
+			switches[hash] = nil
+
+		end
+	end
+
+	local time_usage = minetest.get_us_time() - now
+
+	if has_monitoring_mod then
+		active_switching_stations_metric.set(active_switches)
+		switching_stations_usage_metric.inc(time_usage)
+	end
+
+
+end)

technic/mod.conf

@@ -1,3 +1,3 @@
 name = technic
 depends = default, pipeworks, technic_worldgen, basic_materials
-optional_depends = bucket, screwdriver, mesecons, mesecons_mvps, digilines, digiline_remote, intllib, unified_inventory, vector_extras, dye
+optional_depends = bucket, screwdriver, mesecons, mesecons_mvps, digilines, digiline_remote, intllib, unified_inventory, vector_extras, dye, monitoring