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"""Celery tasks.
"""
from datetime import timedelta
from celery.task import PeriodicTask
import subprocess
import urllib2
import urlparse
from PIL import Image, ImageOps
from StringIO import StringIO
from django.conf import settings
import os
import re
import sublab_monitor
class NetworkStatus(PeriodicTask):
"""Periodic task for getting sublab network status
"""
hosts = {
'taifun': '172.22.83.5',
'trieste': '172.22.80.4',
'nautilus': '172.22.80.7',
}
run_every = timedelta(minutes=2)
ignore_result = True
@staticmethod
def host_alive(host):
rc = subprocess.call(['ping', '-c', '2', '-W', '1', host])
if rc == 0:
return True
else:
return False
def run(self, **kwargs):
"""Ping all the hosts.
"""
self.logger = self.get_logger(**kwargs)
results = {}
for host, target in self.hosts.items():
results[host] = self.host_alive(target)
storage = sublab_monitor.Storage('network_status')
for host, status in results.items():
storage.set(host, status)
return repr(results)
class ImageFetcher(object):
"""
A task mixin which downloads, processes and stores an Image
"""
@property
def fetch_url(self):
"""
The location from which the image should be fetched
"""
raise NotImplementedError
@property
def store_name(self):
"""
The name under which the image should be stored
"""
raise NotImplementedError
def process_image(self, image):
"""
This method may be overwritten to perform some
processing on the image
"""
raise NotImplementedError
def replace_file(self, filename, save):
fn = os.path.join(settings.MEDIA_ROOT, filename)
fn_new = os.path.join(settings.MEDIA_ROOT, 'new-%s' % filename)
save(fn_new)
os.rename(fn_new ,fn)
def run(self, **kwargs):
upstream = urllib2.urlopen(self.fetch_url).read()
image = Image.open(StringIO(upstream))
try:
image = self.process_image(image)
except NotImplementedError:
pass
self.replace_file(self.store_name, image.save)
if image.mode.upper() == 'RGBA':
image = Image.composite(image, Image.new("RGB", image.size, (255,255,255)), image)
image.convert("RGB")
image.thumbnail((180, 180), Image.ANTIALIAS)
self.replace_file('thumb_' + self.store_name, image.save)
return 'Done.'
class EnhancingImageFetcher(ImageFetcher):
def process_image(self, image):
rv = ImageOps.autocontrast(image)
rv.im = ImageOps.unsharp_mask(rv, 10.0, 40, 7)
return rv
class KarlHeineCamFetcher(EnhancingImageFetcher, PeriodicTask):
run_every = timedelta(minutes=5)
fetch_url = 'http://taifun.local.sublab.org/webcam.jpg'
store_name = 'karlheine_cam.jpg'
class TempGraphFetcher(ImageFetcher, PeriodicTask):
run_every = timedelta(minutes=5)
fetch_url = 'http://taifun.local.sublab.org/temperature/temp-2hour.png'
store_name = 'tempgraph.png'
class ReeknerSprookTempFetcher(ImageFetcher, PeriodicTask):
run_every = timedelta(minutes=5)
store_name = 'reeknersprook.png'
@property
def fetch_url(self):
url = 'http://reeknersprook.de/sublog/graph-small'
buf = urllib2.urlopen(url).read()
rel = re.search(r'src="(.*?)"', buf).group(1)
return urlparse.urljoin(url, rel)
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