Question

我正在编写一个使用Lua套接字与http服务器通信的程序。我使用的API是“socket.http.request”，我发现它是同步的。我的理解是，它等待它得到一些响应或超时。我的理解是否正确？如果是这样，我宁愿使用异步API。

我还发现了另一个API“socket.http.request_cb”，它在处理请求时调用了一个回调函数。但是，它似乎不适用于此。（这个API在我正在使用的版本上不可用。）我在这里使用Lua 5.1和Lua socket 2.0.2。谁能告诉我哪个版本的Lua或Lua套接字有这个API？

Answer 1

使用connection：settimeout（）可以设置连接的超时时间。这用于Lua Socket的并行下载器的这个例子：

function download (host, file, port)
    port = port or 80
    print (host, file, port)    
    local connectStatus, myConnection = pcall (socket.connect,host,port)
    if (connectStatus) then
        myConnection:settimeout(0.01) -- do not block you can play with this value
        local count = 0 -- counts number of bytes read
        -- May be easier to do this LuaSocket's HTTP functions
        myConnection:send("GET " .. file .. " HTTP/1.0\r\n\r\n")
        local lastStatus = nil
        while true do
            local buffer, status, overflow = receive(myConnection, lastStatus)
            -- If buffer is not null the call was a success (changed in LuaSocket 2.0)
            if (buffer ~= nil) then
                 io.write("+")
                 io.flush()
                 count = count + string.len(buffer)
            else
                print ("\n\"" .. status .. "\" with " .. string.len(overflow) .. " bytes of " .. file)
                io.flush()
                count = count + string.len(overflow)
            end
            if status == "closed" then break end
                lastStatus=status
            end
        myConnection:close()
        print(file, count)
    else
        print("Connection failed with error : " .. myConnection)
        io.flush()
    end
end

threads = {} -- list of all live threads

function get (host, file, port)
    -- create coroutine
    local co = coroutine.create(
        function ()
            download(host, file, port)
        end)
    -- insert it in the 
    table.insert(threads, co)
end

function receive (myConnection, status)
    if status == "timeout" then
        print (myConnection, "Yielding to dispatcher")
        io.flush()
        coroutine.yield(myConnection)
    end
    return myConnection:receive(1024)
end

function dispatcher ()
    while true do
        local n = table.getn(threads)
        if n == 0 then break end -- no more threads to run
        local connections = {}
        for i=1,n do
            print (threads[i], "Resuming")
            io.flush()
            local status, res = coroutine.resume(threads[i])
            if not res then -- thread finished its task?
                table.remove(threads, i)
                break
            else -- timeout
                table.insert(connections, res)
            end
        end
        if table.getn(connections) == n then
            socket.select(connections)
        end
    end
end

host = "www.w3.org"
get(host, "/TR/html401/html40.txt")
get(host,"/TR/2002/REC-xhtml1-20020801/xhtml1.pdf")
get(host,"/TR/REC-html32.html")
get(host,"/TR/2000/REC-DOM-Level-2-Core-20001113/DOM2-Core.txt")
dispatcher()

Answer 2

我正在使用lua-ev进行所有IO多路复用。它是一个类似于node.js后面的事件循环实现。一个线程，没有比赛。

Answer 3

您可能会在luaThread中找到一些灵感。其中一个演示是异步wget。

最近开发的线程库lua-llthreads支持the ZMQ "socket library that acts as a concurrency framework"的lua-zmq

Lua套接字异步调用

3 个答案: