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|
--
-- gcsd
--
-- gcsd the generic command sequencer daemon can be used to serialize
-- commands sent over various paralell communication channels to a
-- single command output. It can be seen as a multiplexer for any
-- kind of communication between a single resource and various clients
-- which want to submit commands to it or query information from it.
-- gcsd is written in C and Lua. The goal is to provide an easy to
-- understand high level API based on Lua which can be used to
-- implement the business logic of the so formed multiplexer daemon.
--
--
-- Copyright (C) 2009-2010 Markus Grueneis <gimpf@spreadspace.org>
-- Christian Pointner <equinox@spreadspace.org>
--
-- This file is part of gcsd.
--
-- gcsd 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.
--
-- gcsd 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 gcsd. If not, see <http://www.gnu.org/licenses/>.
--
local socket = require("socket")
local defines = require("defines")
function main_loop(opt)
log.printf(log.NOTICE, "main_loop started")
local sig = signal.init()
log.printf(log.DEBUG, "gcsd output = %s", opt.cmd_out)
for idx, input in ipairs(opt.cmd_ins) do
log.printf(log.DEBUG, "gcsd input[%d] = %s", idx, input)
end
--- TODO: load configured modules (use own module loader)
local modules = {}
-- parse module config
local old_path = package.path
package.path = "./modules/?.lua"
dummy = require ("dummy")
if(opt.debug) then
debug_shell = require ("debug_shell")
end
package.path = old_path
table.insert(modules, dummy:new({}))
if(opt.debug) then
table.insert(modules, debug_shell:new({["host"]="127.0.0.1", ["port"]="9000"}))
end
--------
local return_value = 0
while return_value == 0 do
local readables = { sig }
for _, module in ipairs(modules) do
for _, fd in ipairs(module:get_read_handles()) do
table.insert(readables, fd)
end
end
for _, client in ipairs(client_list.clients) do
for _, fd in ipairs(client:get_read_handles()) do
table.insert(readables, fd)
end
end
local writeables = { }
for _, module in ipairs(modules) do
for _, fd in ipairs(module:get_write_handles()) do
table.insert(writeables, fd)
end
end
for _, client in ipairs(client_list.clients) do
for _, fd in ipairs(client:get_write_handles()) do
table.insert(writeables, fd)
end
end
local readable, writeable, err = socket.select(readables, writeables)
if(err) then
log.printf(log.ERROR, "select returned with error: %s", err)
return_value = -1
else
for _, input in ipairs(readable) do
if(input == sig) then
return_value = signal.handle()
if(return_value == 1) then break end
else
local ret = input:read()
if(ret == defines.KILL_DAEMON) then
return_value = 2
break
elseif(ret == defines.KILL_MODULE_TYPE) then
-- TODO: remove all modules of same type as this and
-- unload module
elseif(ret == defines.KILL_MODULE) then
input.client_instance.module_instance:cleanup()
elseif(ret == defines.KILL_CLIENT) then
input.client_instance:cleanup()
end
end
end
for _, output in ipairs(writeable) do
ret = output:write()
if(ret ~= defines.OK) then
output.client_instance:cleanup()
end
end
end
end
if(return_value == 2) then return_value = 0 end
for _, module in ipairs(modules) do
module:cleanup()
end
signal.stop()
return return_value
end
|
