systemScanner.lua

local function copyTable(...)
    local tArgs = {...}
    local copy = {}
    for _, piece in pairs(tArgs) do
        if piece and type(piece) == "table" then
            for key, val in pairs(piece) do
                if type(val) == "table" then copy[key] = copyTable( copy[key] or {}, val)
                else copy[key] = val end
            end
        end
    end
    return copy
end

local ticker = peripheral.find("stockcheckingblock")

local toMonitor = {"minecraft:cobblestone"}
local itemLocations = {}
local networkSize = ticker.inventorySize()
local emptyTable = {}
local timeTable = {}
local iter = 0
while true do
    iter = iter + 1
    timeTable[iter] = {os.epoch("utc")}
    for i=1, networkSize do
        term.clear()
        term.setCursorPos(1,1)
        print("Getting item locations")
        print(tostring(iter)..": "..tostring(i).."/"..tostring(networkSize))
        local item = ticker.itemBasicDetails(i)
        if itemLocations[item.id] == nil then
            itemLocations[item.id] = copyTable(emptyTable)
        end
        table.insert(itemLocations[item.id], i)
    end
    emptyTable[iter] = -1
    timeTable[iter][2] = os.epoch("utc")
    local serialised = textutils.serialise({
        itemLocations = itemLocations,
        timeTable = timeTable,
    })
    local h = fs.open("systemScan.lon","w+")
    h.write(serialised)
    h.close()
end