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fix killing of child processes without killing the whole app

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This commit is contained in:
Alexander Minges 2019-02-01 11:27:28 +01:00
parent a8c7d8e74f
commit 7558c6d196
1 changed files with 17 additions and 13 deletions
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30
phytopi/camera/camera.py
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@ -8,17 +8,15 @@ import signal
from enum import Enum
from phytopi import db, models, app
# map commands
camera_cmds = {
'start_timelapse': 'tl 1',
'stop_timelapse': 'tl 0'
}
class CameraActionError(Exception):
pass
class CameraStatus(Enum):
STOPPED = 0
IDLE = 1
TIMELAPSE = 2
VIDEO = 3
SHOT = 4
class CameraWorker(object):
def __init__(self, pidfile='/tmp/raspimjpeg.pid', executable='/usr/local/bin/raspimjpeg', fifo='/dev/shm/mjpeg/FIFO', app=None):
@ -45,7 +43,7 @@ class CameraWorker(object):
pass
# if not, spawn new process and create pid file
self.proc = subprocess.Popen([self.executable])
self.proc = subprocess.Popen([self.executable], preexec_fn=os.setsid)
self.pid = self.proc.pid
with open(self.pidfile, 'w') as fh:
fh.write(str(self.pid))
@ -58,10 +56,16 @@ class CameraWorker(object):
self.status = CameraStatus.STOPPED
def send_cmd(self, cmd):
if cmd in camera_cmds:
with open(self.fifo, 'w') as fh:
fh.write(cmd)
if cmd == camera_cmds['start_timelapse']:
self.status = CameraStatus.TIMELAPSE
if cmd == camera_cmds['stop_timelapse']:
self.status = CameraStatus.IDLE
with open(self.fifo, 'w') as fh:
fh.write(cmd)
def timelapse(self, interval = 0):
if self.status == CameraStatus.IDLE:
self.send_cmd('tl {}'.format(str(interval)))
self.status = CameraStatus.TIMELAPSE
elif self.status == CameraStatus.TIMELAPSE:
self.send_cmd('tl 0')
self.status == CameraStatus.IDLE
else:
raise CameraActionError('Camera neither idle nor in timelapse mode!')