Add Supplier def; generify cache logic

logic/network_storage.lua

@@ -74,4 +74,39 @@ function logistica.take_stack_from_mass_storage(stackToTake, network, collectorF
     storageInv:set_list(MASS_STORAGE_LIST_NAME, storageList)
   end
   return false
+end
+
+-- attempts to insert the given itemstack in the network, returns how many items were inserted
+function logistica.insert_item_in_network(itemstack, networkId)
+  local network = logistica.networks[networkId]
+  if not itemstack or not network then return 0 end
+
+  local workingStack = ItemStack(itemstack)
+  -- check demanders first
+  for hash, _ in pairs(network.demanders) do
+    local pos = minetest.get_position_from_hash(hash)
+    logistica.load_position(pos)
+    local taken = 0 -- logistica.try_to_give_item_to_demander(pos, workingStack)
+    local leftover = workingStack:get_count() - taken
+    if leftover <= 0 then return itemstack:get_count() end -- we took all items
+    workingStack:set_count(leftover)
+  end
+
+  -- check storages
+  local storages = {}
+  if itemstack:get_stack_max() <= 1 then
+    storages = network.item_storage
+  else
+    storages = network.mass_storage
+  end
+  for hash, _ in pairs(storages) do
+    local pos = minetest.get_position_from_hash(hash)
+    logistica.load_position(pos)
+    local taken = logistica.try_to_add_item_to_storage(pos, workingStack)
+    local leftover = workingStack:get_count() - taken
+    if leftover <= 0 then return itemstack:get_count() end -- we took all items
+    workingStack:set_count(leftover)
+  end
+
+  return itemstack:get_count() - workingStack:get_count()
 end