add switching station metrics (#1)

* add switching station metrics

* remove unneeded if

* fix wrong import

Co-authored-by: BuckarooBanzay <BuckarooBanzay@users.noreply.github.com>

init.lua

@@ -17,6 +17,9 @@ dofile(MP.."/abm.lua")
 -- quarry
 dofile(MP.."/quarry.lua")
 
+-- switching station
+dofile(MP.."/switch.lua")
+
 if minetest.settings:get_bool("monitoring.technic.verbose") then
   -- intercept *all* machines (may be slow!)
   dofile(MP.."/technic_run.lua")

quarry.lua

@@ -1,9 +1,7 @@
 
-local quarry_node = minetest.registered_nodes["technic:quarry"]
-if quarry_node ~= nil then
-	print("[monitoring] wrapping quarry.technic_run")
+local quarry_def = minetest.registered_nodes["technic:quarry"]
+assert(quarry_def)
 
-	quarry_node.technic_run = monitoring
-	.counter("technic_quarry_dig_count", "number of technic quarry digs")
-	.wrap(quarry_node.technic_run)
-end
+quarry_def.technic_run =
+	monitoring.counter("technic_quarry_dig_count", "number of technic quarry digs")
+	.wrap(quarry_def.technic_run)

switch.lua

@@ -0,0 +1,21 @@
+assert(type(technic.network_run) == "function")
+assert(type(technic.active_networks) == "table")
+
+technic.network_run =
+	monitoring.counter("technic_switching_stations_usage", "usage in microseconds cpu time")
+	.wraptime(technic.network_run)
+
+local active_switching_stations_metric = monitoring.gauge(
+	"technic_active_switching_stations",
+	"Number of active switching stations"
+)
+
+local function count_stations()
+	local count = 0
+	for _ in pairs(technic.active_networks) do
+		count = count + 1
+	end
+	active_switching_stations_metric.set(count)
+	minetest.after(5, count_stations)
+end
+count_stations()