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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/>.
--
command_queue = {}
command_queue.commands = {}
command_queue.current = nil
function command_queue:enqueue(command, expected_response, requester, timeout)
if(not command) then
log.printf(log.INFO, "ignoring empty command")
end
local new_cmd = {}
new_cmd.command = command
new_cmd.sent = false
new_cmd.requester = requester
if(expected_response and module_list.output.class.properties.type == defines.OUT_MODULE) then
log.printf(log.WARNING, "output module doesn't support responses, ignoring expected response");
else
new_cmd.expected_response = expected_response
end
if(timeout) then
new_cmd.timeout = timer.new(timeout)
end
table.insert(self.commands, new_cmd)
end
function command_queue:command_pending()
return (self.current == nil and #self.commands > 0)
end
function command_queue:get_current_command()
return self.current
end
function command_queue:get_expected_response()
if(self.current == nil) then return end
return self.current.expected_response
end
function command_queue:get_next_command()
if(self.current ~= nil) then return nil end
self.current = self.commands[1]
return self.current.command
end
function command_queue:command_sent()
if(self.current == nil) then return end
self.current.sent = true
if(self.current.timeout) then
self.current.expiration_time = timer.now() + self.current.timeout
end
if(self.current.expected_response) then
return self.current.expected_response
end
if(not self.current.expiration_time) then
self:command_completed()
end
end
function command_queue:check_timeout()
if(self.current == nil or not self.current.sent) then return end
if(not self.current.expiration_time) then return end
if(timer.cmp(timer.now(), self.current.expiration_time) == 1) then
log.printf(log.NOTICE, "command timed out")
if(self.current.requester) then
self.current.requester:process_timeout()
end
self:command_completed()
end
end
function command_queue:command_completed(response)
if(self.current == nil) then return end
if(response and self.current.requester) then
self.current.requester:process_response(response)
end
table.remove(self.commands, 1)
self.current = nil
end
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