1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
--
-- 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/>.
--
-- tcp_listen module class
local tcp_listen = {}
tcp_listen.properties = { type=defines.IN_MODULE, name="tcp-listen", max_instances=-1 }
tcp_listen.defaults = { port = "1234" }
tcp_listen.next_id = 0
-- create new instance of tcp_listen module class
function tcp_listen:new(config, runtype)
local inst = {}
inst.class = self
inst.config = config
inst.config.runtype = runtype
if(config.name == nil or config.name == "") then
inst.name = self.properties.name .. self.next_id
self.next_id = self.next_id + 1
else
inst.name = config.name
end
if(not config.port) then config.port = self.defaults.port end
local lst, err = tcp.server(config.addr, config.port, config.resolv_type)
if(not lst) then
return nil
end
inst.listeners = lst
for _, l in ipairs(inst.listeners) do
log.printf(log.NOTICE, "%s: listening on %s", inst.name, tcp.endtostring(l.local_end))
function l:read()
local new_client, addr = tcp.accept(self.fd)
if(not new_client) then
log.printf(ERROR, "inst.name: %s", addr)
return defines.KILL_MODULE
end
local client_handle = {}
client_handle.fd = new_client
client_handle.client_instance = nil
client_handle.in_buffer = ""
client_handle.out_buffer = ""
function client_handle:read()
-- TODO: which size should we request??
local buffer, err = tcp.recv(self.fd, 100)
if(buffer == nil) then
log.printf(log.ERROR, inst.name .. ": connection error: %s", err)
return defines.KILL_CLIENT
end
if(#buffer == 0) then
log.printf(log.INFO, inst.name .. ": connection closed")
return defines.KILL_CLIENT
end
self.in_buffer = self.in_buffer .. buffer
if(inst.config.runtype == defines.IN_MODULE) then
self.in_buffer = command_table:dispatch(self.in_buffer)
else
self.in_buffer = response_table:dispatch(self.in_buffer)
end
return defines.OK
end
function client_handle:write()
local len, err = tcp.send(self.fd, self.out_buffer)
if(len == nil) then
log.printf(log.ERROR, inst.name .. ": connection error: %s", err)
ret = defines.KILL_CLIENT
else
self.out_buffer = string.sub(self.out_buffer, len+1)
end
if(inst.config.runtype == defines.OUT_MODULE and self.out_buffer == "") then
command_queue:command_sent()
end
return defines.OK
end
local client = {}
client.module_instance = inst
client.addr = addr
client.name = inst.name .. "#" .. tcp.endtostring(addr)
function client:process_response() end
function client:process_timeout() end
function client:get_read_handles()
return { client_handle }
end
function client:get_write_handles()
if(client_handle.out_buffer ~= "") then
return { client_handle }
else
return {}
end
end
function client:cleanup()
rawio.close(client_handle.fd)
end
client_handle.client_instance = client
client_list:register(client)
return defines.OK
end
function l:write() return defines.OK end
end
function inst:cleanup()
client_list:unregister_by_module(self)
for _, l in ipairs(self.listeners) do
rawio.close(l.fd);
end
end
function inst:get_read_handles()
return self.listeners
end
function inst:get_write_handles()
return {}
end
setmetatable(inst, {})
getmetatable(inst).__gc = function() inst:cleanup() end
return inst
end
return tcp_listen
|
