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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 get_readables()
local readables = {}
for _, module in ipairs(module_list.inputs) do
for _, fd in ipairs(module:get_read_handles()) do
table.insert(readables, fd)
end
end
for _, fd in ipairs(module_list.output.get_read_handles()) do
table.insert(readables, fd)
end
for _, client in ipairs(client_list.clients) do
for _, fd in ipairs(client:get_read_handles()) do
table.insert(readables, fd)
end
end
return readables
end
function get_writeables()
local writeables = { }
for _, module in ipairs(module_list.inputs) do
for _, fd in ipairs(module:get_write_handles()) do
table.insert(writeables, fd)
end
end
for _, fd in ipairs(module_list.output.get_write_handles()) do
table.insert(readables, fd)
end
for _, client in ipairs(client_list.clients) do
for _, fd in ipairs(client:get_write_handles()) do
table.insert(writeables, fd)
end
end
return writeables
end
function main_loop(opt)
log.printf(log.NOTICE, "main_loop started")
local sig = signal.init()
local return_value = module_list:init(opt)
if(return_value == defines.KILL_DAEMON) then
return_value = -1
else
return_value = 0
end
while return_value == 0 do
local readable, writeable, err = socket.select({ sig, unpack(get_readables()) }, get_writeables())
if(err) then
log.printf(log.ERROR, "select returned with error: %s", err)
return_value = -1
else
for _, reader in ipairs(readable) do
if(reader == sig) then
return_value = signal.handle()
if(return_value == 1) then break end
else
local ret = reader:read()
if(ret == defines.KILL_DAEMON) then
return_value = 2
break
elseif(ret == defines.KILL_MODULE_CLASS) then
module_list:unregister_by_class(reader.client_instance.module_instance.class)
elseif(ret == defines.KILL_MODULE) then
module_list:unregister(reader.client_instance.module_instance)
elseif(ret == defines.KILL_CLIENT) then
client_list:unregister(reader.client_instance)
end
end
end
for _, writer in ipairs(writeable) do
ret = writer:write()
if(ret == defines.KILL_CLIENT) then
client_list:unregister(writer.client_instance)
end
end
if(command_queue:command_pending()) then
local command = command_queue:get_next_command()
log.printf(log.DEBUG, "sending pending command: %s", command)
module_list.output:start_command(command)
end
end
end
if(return_value == 2) then return_value = 0 end
module_list:cleanup()
signal.stop()
return return_value
end
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