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Echo server: Difference between revisions
Added Lua version
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"wassup?"
</pre>
=={{header|Lua}}==
{{libheader|LuaSocket}}
This implementation doesn't rely on coroutines because they're an additional (often confusing) notion that could make the example needlessly hard to understand. Instead I've used a table of not-quite-non-blocking sockets (they block for one microsecond), which I loop through, checking on whether each one has either a line to echo or an error to warrant deletion.
<lang Lua>require("socket")
function checkOn (client)
local line, err
line, err = client:receive()
if line then
print(tostring(client) .. " said " .. line)
client:send(line .. "\n")
end
if err and err ~= "timeout" then
print(tostring(client) .. " " .. err)
client:close()
return err
end
return false
end
local delay, clients, newClient = 10^-6, {}
local server = assert(socket.bind("*", 12321))
server:settimeout(delay)
print("Server started")
while 1 do
repeat
newClient = server:accept()
for k, v in pairs(clients) do
if checkOn(v) then table.remove(clients, k) end
end
until newClient
newClient:settimeout(delay)
print(tostring(newClient) .. " connected")
table.insert(clients, newClient)
end</lang>
=={{header|Nim}}==
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