【高级技巧】重试风暴：失败重试引发的雪崩治理

local breaker = { fails = 0, openUntil = 0 }
local function retryWithBackoff(fn, maxRetry)
    if os.time() < breaker.openUntil then
        return false, "熔断中"
    end
    local delay = 200
    for attempt = 1, maxRetry do
        local ok = fn()
        if ok then
            breaker.fails = 0
            return true
        end
        breaker.fails = breaker.fails + 1
        if breaker.fails >= 10 then
            breaker.openUntil = os.time() + 60
            print("连续失败 10 次，熔断 60 秒")
            return false, "熔断触发"
        end
        local jitter = math.random(0, delay // 2)
        local until2 = os.clock() * 1000 + delay + jitter
        while os.clock() * 1000 < until2 do
            coroutine.yield()
        end
        delay = delay * 2
    end
    return false, "重试耗尽"
end

local ok = retryWithBackoff(function()
    return pushCrossReport()
end, 3)