lua coroutine 异步转同步

最新推荐文章于 2025-01-06 17:49:20 发布

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最新推荐文章于 2025-01-06 17:49:20 发布

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分类专栏： lua 文章标签： lua coroutine

本文链接：https://blog.youkuaiyun.com/lqefn/article/details/51615348

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本文展示了如何在Lua中利用coroutine将异步HTTP请求转换为同步操作。通过创建线程并使用coroutine.resume进行调度，确保所有任务完成后再执行后续操作。示例中详细演示了异步请求、线程管理和任务回调的实现过程。

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local Thread = require("llthreads2.ex")
local socket = require("socket")
local http = require("socket.http")

taskList = {}

function startHttpRequestTask(url, callback)
print("startHttpRequest", url)
local task = Thread.new(function(url)
local http = require("socket.http")
local ltn12 = require("ltn12")
print("request", url)
local t = {}
local respt = http.request{
url = url,
sink = ltn12.sink.table(t)
}
return table.concat(t)
end, url)
task:start()
taskList[#taskList + 1] = {task = task, callback = callback}
end

function AsyncHttpRequest(url)
local coro = coroutine.running()
print("load :", url)
startHttpRequestTask(url, function(result) coroutine.resume(coro, result) end)
end

function update()
if #taskList > 0 then
for idx = #taskList, 1, -1 do
local taskInfo = taskList[idx]

local task = taskInfo.task
if not task:alive() then
local ok, ret = task:join()
local callback = taskInfo.callback
print("task done")
callback(ret)
table.remove(taskList, idx)
end
end
return true
else
print("all task complete")
return false
end
end

function cofunction()
print("start")
local dataList = {"http://www.baidu.com", "http://www.python.com", "http://www.sina.cn"}
for idx, data in ipairs(dataList) do
local param = data
print("loadAsync:", param)
local res = coroutine.yield(AsyncHttpRequest(param))
print("task result:", string.sub(res, 1, 100) .. "...")
end
end

co = coroutine.create(cofunction)
print(coroutine.resume(co))

function loop()
while update() do
socket.sleep(1.0 / 60)
--print("update")
end
end

loop()