【案例复盘】以物易物纠纷：单端确认导致的物品蒸发事故

function tradeSwapV1(actor, targetName, myItem, wantItem)
    local player = class(actor)
    player:takeitem(myItem, 1)
    local other = getplayerbyname(targetName)
    if other == nil or not isplayer(other) then
        return
    end
    class(other):takeitem(wantItem, 1)
    giveitem(actor, wantItem, 1)
    giveitem(other, myItem, 1)
end

local pending = {}
function tradeConfirm(actor, dealId)
    local player = class(actor)
    local deal = pending[dealId]
    if deal == nil then return end
    deal.confirmed[player:GetName()] = true
    if deal.confirmed[deal.a] and deal.confirmed[deal.b] then
        local pa = getplayerbyname(deal.a)
        local pb = getplayerbyname(deal.b)
        if pa ~= nil and pb ~= nil and isplayer(pa) and isplayer(pb) then
            class(pa):takeitem(deal.itemA, 1)
            class(pb):takeitem(deal.itemB, 1)
            giveitem(pa, deal.itemB, 1)
            giveitem(pb, deal.itemA, 1)
        end
        pending[dealId] = nil
    end
end