LuaSocket服务器:accept()超时(TCP)

时间:2017-02-24 18:03:50

标签: lua luasocket

问题

关注LuaSocket Introduction我设法让服务器运行。我还设法从客户端连接。但是,我注意到服务器脚本冻结,直到server:accept()获得连接。

研究

LuaSocket Reference指定:

  

使用settimeout方法或接受可能阻止,直到另一个客户端显示。

这甚至包含在示例代码中。但是,在client:settimeout(10)之后调用local client = server:accept(),因此脚本在到达此点之前就会被阻止。

我读到这可以通过多线程来解决,但这似乎是夸大其词。

问题

  1. 如何使服务器脚本停止等待连接并继续前进?
  2. 如何防范client:receive()(服务器端)和tcp:receive()(客户端)(或client:settimeout(10)负责)的类似问题?
  3. 代码

    服务器(来自LuaSocket Introduction

    -- load namespace
    local socket = require("socket")
    -- create a TCP socket and bind it to the local host, at any port
    local server = assert(socket.bind("*", 0))
    -- find out which port the OS chose for us
    local ip, port = server:getsockname()
    -- print a message informing what's up
    print("Please telnet to localhost on port " .. port)
    print("After connecting, you have 10s to enter a line to be echoed")
    -- loop forever waiting for clients
    while 1 do
      -- wait for a connection from any client
      local client = server:accept()
      -- make sure we don't block waiting for this client's line
      client:settimeout(10)
      -- receive the line
      local line, err = client:receive()
      -- if there was no error, send it back to the client
      if not err then client:send(line .. "\n") end
      -- done with client, close the object
      client:close()
    end
    

    客户端(跟this answer

    local host, port = "127.0.0.1", 100
    local socket = require("socket")
    local tcp = assert(socket.tcp())
    
    tcp:connect(host, port);
    --note the newline below
    tcp:send("hello world\n");
    
    while true do
        local s, status, partial = tcp:receive()
        print(s or partial)
        if status == "closed" then break end
    end
    tcp:close()
    

1 个答案:

答案 0 :(得分:2)

您应该可以在致电server:accept()之前使用server:timeout()

server:settimeout(2)
local client, err = server:accept()
print(client, err)

如果2秒内没有请求,我会打印nil timeout