local eplib = require("entrypointlib")

local function readTable()
    local file = fs.open("data.db","r")
    if not file then error("failed to open db file") end
    return textutils.unserialise(file.readAll() or "{}") or {}
end

local function writeTable(t)
    local file = fs.open("data.db", "w")
    if not file then error("failed to open db file") end
    file.write(textutils.serialise(t))
    file.close()
end

local function receive()
    while true do
        sleep(0)
        local _,msg,id = os.pullEvent("network_packet")
        if msg.proto == "getTable" then
            eplib.send({proto = "resp", table = readTable()}, id)
            print("sent table to "..tostring(id))
        elseif msg.proto == "setTable" then
            writeTable(msg.table)
            print("updated table from "..tostring(id))
            eplib.send({proto="OK"},id)
        end
    end
end

parallel.waitForAny(eplib.loop,receive)