Problem
Following LuaSocket
Introduction I managed to get the server running. I also managed to connect from the client side. I noticed, however, that the server script freezes until server:accept()
gets the connection.
Research
LuaSocket
Reference specifies:
Use the settimeout method or accept might block until another client shows up.
This is even included in the example code. However, client:settimeout(10)
is called after local client = server:accept()
so the script gets blocked before it reaches this point.
I read that this could be worked around by multithreading but this seems to be an exaggeration.
Questions
client:receive()
(server side) and tcp:receive()
(client side) (or client:settimeout(10)
takes care of that)?Code
server (from 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
client (follows 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()
You should be able to use server:timeout() before calling server:accept()
:
server:settimeout(2)
local client, err = server:accept()
print(client, err)
This prints nil timeout
for me if no request comes in 2 seconds.