【工具链】Mock 服务：第三方支付的联调替身

---支付 Mock：仿真下单与回调
local Mock = { orders = {} }

function Mock.createOrder(userId, amount, subject)
    local orderId = "MOCK" .. os.time() .. userId
    Mock.orders[orderId] = {
        uid = userId, amt = amount,
        status = "created", at = os.time(),
    }
    return orderId
end

function Mock.payCallback(orderId, ok)
    local o = Mock.orders[orderId]
    if not o then return false, "订单不存在" end
    o.status = ok and "paid" or "failed"
    -- 按真实平台的回调格式发往游戏服
    httppost(GameCfg.callbackUrl, {
        orderId = orderId,
        amount = o.amt,
        sign = Mock.sign(orderId, o.amt),
        status = o.status,
    })
    return true
end

---故障注入：超时、重复、金额不符
function Mock.inject(case, orderId)
    if case == "timeout" then
        -- 不回调，验证游戏的补单轮询
        Mock.orders[orderId].status = "paid_no_notify"
    elseif case == "duplicate" then
        -- 同一订单回调三次，验证幂等
        for _ = 1, 3 do
            Mock.payCallback(orderId, true)
        end
    elseif case == "mismatch" then
        -- 金额不符的回调，验证拒绝逻辑
        httppost(GameCfg.callbackUrl, {
            orderId = orderId, amount = 0.01,
            sign = Mock.sign(orderId, 0.01),
            status = "paid",
        })
    end
end