From 9f9d7489b5b6b34f4be3ef57ae644b96aa3d7e4b Mon Sep 17 00:00:00 2001
From: Christian Franke <nobody@nowhere.ws>
Date: Mon, 16 Jan 2012 18:28:52 +0100
Subject: Add tasks which fetch webcam images

---
 sublab_project/fixtures/flatpages.json |  2 +-
 sublab_project/sublab_monitor/tasks.py | 69 +++++++++++++++++++++++++++++++++-
 sublab_project/templates/base.html     |  9 ++++-
 3 files changed, 76 insertions(+), 4 deletions(-)

diff --git a/sublab_project/fixtures/flatpages.json b/sublab_project/fixtures/flatpages.json
index 09077dd..9fa5991 100644
--- a/sublab_project/fixtures/flatpages.json
+++ b/sublab_project/fixtures/flatpages.json
@@ -115,7 +115,7 @@
             "sites": [
                 1
             ], 
-            "content": "<h2>Webcams</h2>\r\n<p>\r\n\tIm sublab befinden sich mehrere Webcams.\r\n\tDie Aufnahmen einiger Webcams werden hier zur Verf\u00fcgung gestellt.\r\n</p>\r\n<h3>\r\n\tPeriskop\r\n</h3>\r\n<div class=\"imagecontent\">\r\n\t<a href=\"img/rack.webcam.jpg\" target=\"_blank\" class=\"img\"><img src=\"img/rack.webcam.jpg\" alt=\"Karl-Heine-Strasse\" class=\"contentimage\"></a>\r\n</div>\r\n<p>\r\n\tDiese Webcam zeigt den Blick nach Westen aus unseren Fenstern, entlang der Karl-Heine-Stra\u00dfe. Linker Hand befindet sich die GaraGe, im Vordergrund die Villa (auf dem Westwerkgel\u00e4nde), und rechter Hand das Jahrtausendfeld.<br> \r\n\tIm Hintergrund befindet sich die Baustelle des Taschenkaufhauses.\r\n</p>\r\n<h3>\r\n\tDachcam\r\n</h3>\r\n<div class=\"imagecontent\">\r\n\t<a href=\"img/dach.webcam.jpg\" target=\"_blank\" class=\"img\"><img src=\"img/dach.webcam.jpg\" alt=\"Dachcam\" class=\"contentimage\"></a>\r\n</div>\r\n<p>\r\n\tAuf dieser Webcam ist ein Blick nach Osten ueber das angrenzende Dach der gro\u00dfen Halle des Westwerks zu sehen.\r\n</p>\r\n", 
+            "content": "<h2>Webcams</h2>\r\n<p>\r\n\tIm sublab befinden sich mehrere Webcams.\r\n\tDie Aufnahmen einiger Webcams werden hier zur Verf\u00fcgung gestellt.\r\n</p>\r\n<h3>\r\n\tPeriskop\r\n</h3>\r\n<div class=\"imagecontent\">\r\n\t<a href=\"/media/karlheine_cam.jpg\" target=\"_blank\" class=\"img\"><img src=\"/media/karlheine_cam.jpg\" alt=\"Karl-Heine-Strasse\" class=\"contentimage\"></a>\r\n</div>\r\n<p>\r\n\tDiese Webcam zeigt den Blick nach Westen aus unseren Fenstern, entlang der Karl-Heine-Stra\u00dfe. Linker Hand befindet sich die GaraGe, im Vordergrund die Villa (auf dem Westwerkgel\u00e4nde), und rechter Hand das Jahrtausendfeld.<br> \r\n\tIm Hintergrund befindet sich die Baustelle des Taschenkaufhauses.\r\n</p>", 
             "enable_comments": false
         }
     }
diff --git a/sublab_project/sublab_monitor/tasks.py b/sublab_project/sublab_monitor/tasks.py
index 33dcad6..20f8ad8 100644
--- a/sublab_project/sublab_monitor/tasks.py
+++ b/sublab_project/sublab_monitor/tasks.py
@@ -3,6 +3,11 @@
 from datetime import timedelta
 from celery.task import PeriodicTask
 import subprocess
+import urllib2
+from PIL import Image, ImageOps
+from StringIO import StringIO
+from django.conf import settings
+import os
 
 import sublab_monitor
 
@@ -14,7 +19,7 @@ class NetworkStatus(PeriodicTask):
             'trieste': '172.22.80.4',
             'nautilus': '172.22.80.7',
     }
-    run_every = timedelta(minutes=4)
+    run_every = timedelta(minutes=2)
     ignore_result = True
 
     def __init__(self, *args, **kwargs):
@@ -44,3 +49,65 @@ class NetworkStatus(PeriodicTask):
             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 run(self, **kwargs):
+        upstream = urllib2.urlopen(self.fetch_url).read()
+        image = Image.open(StringIO(upstream))
+
+        try:
+            image = self.process_image(image)
+        except NotImplementedError:
+            pass
+
+        fn = os.path.join(settings.MEDIA_ROOT, self.store_name)
+        fn_new = os.path.join(settings.MEDIA_ROOT, 'new-%s' % self.store_name)
+
+        image.save(fn_new)
+        os.rename(fn_new, fn)
+
+
+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'
diff --git a/sublab_project/templates/base.html b/sublab_project/templates/base.html
index 8dc99b0..1f9346a 100644
--- a/sublab_project/templates/base.html
+++ b/sublab_project/templates/base.html
@@ -1,5 +1,6 @@
 {% load host_status %}
 {% load flatblock_tags %}
+{% load thumbnail %}
 <!DOCTYPE HTML>
 <html>
 	<head>
@@ -106,9 +107,13 @@
 					{% flatblock "motd" %}
 				</p>
 				<hr>
-				<a href="/webcam/" class="img"><img src="{{ STATIC_URL }}img/thumb.rack.webcam.jpg" alt="Webcam im Fenster" class="webcamthumb"></a>
+				{% thumbnail "karlheine_cam.jpg" "200" upscale=False as image %}
+				<a href="/webcam/" class="img"><img src="{{ image.url }}" alt="Webcam im Fenster" class="webcamthumb"></a>
+				{% endthumbnail %}
 				<hr>
-				<a href="{{ STATIC_URL }}img/tempgraph.png" class="img"><img src="img/thumb.tempgraph.png" alt="Temperaturen im sublab" class="webcamthumb"></a>
+				{% thumbnail "tempgraph.png" "200" upscale=False as image %}
+				<a href="{{ MEDIA_URL }}tempgraph.png" class="img"><img src="{{ image.url }}" alt="Temperaturen im sublab" class="webcamthumb"></a>
+				{% endthumbnail %}
 				<hr>
 				<p class="member">
 					<a href="{{ STATIC_URL }}pdf/sublab_ev_mitgliedsantrag.pdf">Mitglied werden</a>
-- 
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