liststore.lua

os.loadAPI("/liststore")

--Find wireless modem
print("Configuring networking")
rednet.open("left")
print("Done!")

-- Setup database
print ("Configuring database")
db = liststore.TodoDB:new()
db:setDbPath("db.txt")
print ("Done!")

function defaultResponse(succ, ret)
    if succ then
        if ret == true then
            return {status = "Success"}
        else
            return {status = "Error", msg = ret}
        end
    else
        return {status = "Error", msg = "Catastrophic runtime error", err = ret}
    end
end

handlers = {}
function handlers.ping(message)
    return {status = "Success", msg = "pong"}
end

function handlers.addItem(message)
    local succ, ret = pcall(db.addItem, db, message.name, message.priority)
    return defaultResponse(succ, ret)
end

function handlers.renameItem(message)
    local succ, ret = pcall(db.addItem, db, message.from, message.to)
    return defaultResponse(succ, ret)
end

function handlers.modifyAttribute(message)
    local succ, ret = pcall(db.addItemAttribute, db, message.attribute, message.value)
    return defaultResponse(succ, ret)
end

function handlers.removeItem(message)
    local succ, ret = pcall(db.removeItem, db, message.name)
    return defaultResponse(succ, ret)
end

function handlers.listItems(message)
    local succ, ret = pcall(db.getItemNames, db, message.opts)
    if succ then
        return {status = "Success", list = ret}
    else
        return {status = "Error", msg = "Catastrophic runtime error"}
    end
end

function handlers.getItem(message)
    local succ, ret = pcall(db.removeItem, db, message.name)
    if succ then
        if ret == true then
            return {status = "Success", msg = ret}
        else
            return {status = "Error", msg = ret}
        end
    else
        return {status = "Error", msg = "Catastrophic runtime error"}
    end
end

function handleMessage(message)
    if handlers[message.command] == nil then
        return {status = "Error", msg = "Command \"" .. "\" is unknown" }
    end
    return handlers[message.command](message)
end

while true do
    -- Main loop
    local senderId, messageRaw, protocol = rednet.receive("todo")
    local message = textutils.unserialise(messageRaw)

    response = handleMessage(message)

    rednet.send(senderId, textutils.serialise(response))
    print("Handled message")
end