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
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
# controller.py -- Redshift child process controller
# This file is part of redshift-ng.
# redshift-ng 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
# (at your option) any later version.
# redshift-ng 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 redshift-ng. If not, see <http://www.gnu.org/licenses/>.
# Copyright (c) 2013-2017 Jon Lund Steffensen <jonlst@gmail.com>
import os
import re
import fcntl
import signal
import gi
gi.require_version('GLib', '2.0')
from gi.repository import GLib, GObject
from . import defs
class RedshiftController(GObject.GObject):
"""GObject wrapper around the Redshift child process."""
__gsignals__ = {
'inhibit-changed': (GObject.SIGNAL_RUN_FIRST, None, (bool,)),
'temperature-changed': (GObject.SIGNAL_RUN_FIRST, None, (int,)),
'period-changed': (GObject.SIGNAL_RUN_FIRST, None, (str,)),
'location-changed': (GObject.SIGNAL_RUN_FIRST, None, (float, float)),
'error-occured': (GObject.SIGNAL_RUN_FIRST, None, (str,)),
'stopped': (GObject.SIGNAL_RUN_FIRST, None, ()),
}
def __init__(self, args):
"""Initialize controller and start child process.
The parameter args is a list of command line arguments to pass on to
the child process. The "-v" argument is automatically added.
"""
GObject.GObject.__init__(self)
# Initialize state variables
self._inhibited = False
self._temperature = 0
self._period = 'Unknown'
self._location = (0.0, 0.0)
# Start redshift with arguments
args.insert(0, os.path.join(defs.BINDIR, 'redshift'))
if '-v' not in args:
args.insert(1, '-v')
# Start child process with C locale so we can parse the output
env = os.environ.copy()
for key in ('LANG', 'LANGUAGE', 'LC_ALL', 'LC_MESSAGES'):
env[key] = 'C'
self._process = GLib.spawn_async(
args, envp=['{}={}'.format(k, v) for k, v in env.items()],
flags=GLib.SPAWN_DO_NOT_REAP_CHILD,
standard_output=True, standard_error=True)
# Wrap remaining contructor in try..except to avoid that the child
# process is not closed properly.
try:
# Handle child input
# The buffer is encapsulated in a class so we
# can pass an instance to the child callback.
class InputBuffer(object):
buf = ''
self._input_buffer = InputBuffer()
self._error_buffer = InputBuffer()
self._errors = ''
# Set non blocking
fcntl.fcntl(
self._process[2], fcntl.F_SETFL,
fcntl.fcntl(self._process[2], fcntl.F_GETFL) | os.O_NONBLOCK)
# Add watch on child process
GLib.child_watch_add(
GLib.PRIORITY_DEFAULT, self._process[0], self._child_cb)
GLib.io_add_watch(
self._process[2], GLib.PRIORITY_DEFAULT, GLib.IO_IN,
self._child_data_cb, (True, self._input_buffer))
GLib.io_add_watch(
self._process[3], GLib.PRIORITY_DEFAULT, GLib.IO_IN,
self._child_data_cb, (False, self._error_buffer))
# Signal handler to relay USR1 signal to redshift process
def relay_signal_handler(signal):
os.kill(self._process[0], signal)
return True
GLib.unix_signal_add(GLib.PRIORITY_DEFAULT, signal.SIGUSR1,
relay_signal_handler, signal.SIGUSR1)
except:
self.termwait()
raise
@property
def inhibited(self):
"""Current inhibition state."""
return self._inhibited
@property
def temperature(self):
"""Current screen temperature."""
return self._temperature
@property
def period(self):
"""Current period of day."""
return self._period
@property
def location(self):
"""Current location."""
return self._location
def set_inhibit(self, inhibit):
"""Set inhibition state."""
if inhibit != self._inhibited:
self._child_toggle_inhibit()
def _child_signal(self, sg):
"""Send signal to child process."""
os.kill(self._process[0], sg)
def _child_toggle_inhibit(self):
"""Sends a request to the child process to toggle state."""
self._child_signal(signal.SIGUSR1)
def _child_cb(self, pid, status, data=None):
"""Called when the child process exists."""
# Empty stdout and stderr
for f in (self._process[2], self._process[3]):
while True:
buf = os.read(f, 256).decode('utf-8')
if buf == '':
break
if f == self._process[3]: # stderr
self._errors += buf
# Check exit status of child
try:
GLib.spawn_check_exit_status(status)
except GLib.GError:
self.emit('error-occured', self._errors)
GLib.spawn_close_pid(self._process[0])
self.emit('stopped')
def _child_key_change_cb(self, key, value):
"""Called when the child process reports a change of internal state."""
def parse_coord(s):
"""Parse coordinate like `42.0 N` or `91.5 W`."""
v, d = s.split(' ')
return float(v) * (1 if d in 'NE' else -1)
if key == 'Status':
new_inhibited = value != 'Enabled'
if new_inhibited != self._inhibited:
self._inhibited = new_inhibited
self.emit('inhibit-changed', new_inhibited)
elif key == 'Color temperature':
new_temperature = int(value.rstrip('K'), 10)
if new_temperature != self._temperature:
self._temperature = new_temperature
self.emit('temperature-changed', new_temperature)
elif key == 'Period':
new_period = value
if new_period != self._period:
self._period = new_period
self.emit('period-changed', new_period)
elif key == 'Location':
new_location = tuple(parse_coord(x) for x in value.split(', '))
if new_location != self._location:
self._location = new_location
self.emit('location-changed', *new_location)
def _child_stdout_line_cb(self, line):
"""Called when the child process outputs a line to stdout."""
if line:
m = re.match(r'([\w ]+): (.+)', line)
if m:
key = m.group(1)
value = m.group(2)
self._child_key_change_cb(key, value)
def _child_data_cb(self, f, cond, data):
"""Called when the child process has new data on stdout/stderr."""
stdout, ib = data
ib.buf += os.read(f, 256).decode('utf-8')
# Split input at line break
while True:
first, sep, last = ib.buf.partition('\n')
if sep == '':
break
ib.buf = last
if stdout:
self._child_stdout_line_cb(first)
else:
self._errors += first + '\n'
return True
def terminate_child(self):
"""Send SIGINT to child process."""
self._child_signal(signal.SIGINT)
def kill_child(self):
"""Send SIGKILL to child process."""
self._child_signal(signal.SIGKILL)
|
