Eluna Object Triggering Example

local Quest = {
    creature_entry = 123,
    quest_entry = 123,
    gate_entry = 123
}

function Quest.OnQuestAccept(event, player, creature, quest)
    -- Check if the quest we pick up matches the expected quest id.
    if(quest:GetId() == Quest.quest_entry) then
        -- Trigger the gate open and reset function.
        Quest.TriggerGate(player)
    end
end

function Quest.TriggerGate(player)
    -- Retrieve the gate object with a specific entry within 20 yard range of the player.
    -- Can be substituted with other methods of retrieving the gate object.
    local gate = player:GetGameObjectsInRange(20, Quest.gate_entry)

    if(gate) then
        if(gate:GetGoState() == 1) then
            -- If the object state is closed, open gate and register the gate reset event below.
            gate:SetGoState(0)
        elseif(gate:GetGoState() == 0)
            -- If the gate is already open, remove the previous registered timed
            -- event to close the gate, so it can be safely re-registered below.
            gate:RemoveEvents()
        end
        -- Register timed event to close the gate after a set amount of time.
        gate:RegisterEvent(function(_, _, _, gate) gate:SetGoState(1); return; end, 10000, 1)
    end
end

-- Unfortunately we can only hook quest accept event when picked up from a creature.
RegisterCreatureEvent(Quest.creature_entry, 31, Quest.OnQuestAccept)