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|
--
-- rhnop
--
-- Copyright (C) 2011 Christian Pointner <equinox@helsinki.at>
--
-- This file is part of rhnop.
--
-- rhnop is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 3 of the License, or
-- any later version.
--
-- rhnop is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with rhnop. If not, see <http://www.gnu.org/licenses/>.
--
require "socket"
package.path = package.path .. ";" .. rhnoplibdir .. "/?.lua"
conf = require "conf"
function init_server()
local server = assert(socket.tcp())
assert(server:setoption('reuseaddr', true))
assert(server:bind(conf.tcp_host, conf.tcp_port))
assert(server:listen(5))
return server
end
local clients = {}
function add_client(hdl)
-- print("new client(" .. hdl:getfd() .. ") from " .. hdl:getpeername())
local client = {}
client.buffer = ""
client.hdl = hdl
client.getfd = function() return hdl:getfd() end
client.dirty = function() return hdl:dirty() end
table.insert(clients, client)
end
function remove_client(c)
local idx = 0
for idx, client in ipairs(clients) do
if client == c then
break
end
end
-- print("removing client(" .. c.hdl:getfd() .. ")")
c.hdl:close()
table.remove(clients, idx)
end
function cleanup_clients()
for _, client in ipairs(clients) do
client:close()
end
end
function clients_get_writeables()
local fds = {}
for _, client in ipairs(clients) do
if client.buffer ~= "" then
table.insert(fds, client)
end
end
return fds
end
function clients_senddata(timestamp)
for _, client in ipairs(clients) do
client.buffer = client.buffer .. timestamp .. "\n"
end
end
function main_loop()
local pipefd = pipe.getreadfd()
server = init_server()
while true do
local readables, writeables, err = socket.select({ pipefd , server , unpack(clients) } , clients_get_writeables())
if err then
print("select returned with error: " .. err)
return -1
else
for _, input in ipairs(readables) do
if input == pipefd then
local timestamp = pipe.consume()
if timestamp == nil then
return 2
end
-- print("pipe was signaled with timestamp: " .. timestamp)
clients_senddata(timestamp)
elseif input == server then
local client = assert(server:accept())
add_client(client)
else
if input.hdl then
-- receive is insanely stupid, therefore we must always read one byte only
local _, err = input.hdl:receive(1)
if err then
remove_client(input)
end
end
end
end
for _, output in ipairs(writeables) do
local ret = output.hdl:send(output.buffer)
if(ret == nil) then
remove_client(output)
else
output.buffer = string.sub(output.buffer, ret+1)
end
end
end
end
server:close()
cleanup_clients()
return 0
end
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