Start separating out transformation data into classes

pilserv.py

@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+import cStringIO
+import Image
 import os
 import sys
 import time
@@ -7,25 +9,46 @@ import time
 from eventlet import api
 from eventlet.green import BaseHTTPServer
 
-INBOUND_SIZE = 4096
+class TransformException(Exception):
+    pass
+
+class BaseTransform(object):
+    command = None
+    @classmethod
+    def execute(cls, path, out):
+        raise TransformException('Subclasses of BaseTransform must override execute()')
+
+class Resize(BaseTransform):
+    @classmethod
+    def execute(cls, path, out):
+        im = Image.open('python.png')
+        im.thumbnail((16, 16))
+        im.save(out, 'png')
 
 class PILHandler(BaseHTTPServer.BaseHTTPRequestHandler):
     def do_GET(self, *args, **kwargs):
+        out = cStringIO.StringIO()
         print ('do_GET', self.__dict__)
-        out = self.wfile
-        data = ''
-        with open('python.png', 'r') as fd:
-            data = fd.read()
+
+        Resize.execute(None, out)
+        data = out.getvalue()
+        
         self.send_response(200)
         self.send_header('Content-Type', 'image/png')
         self.send_header('Content-Length', len(data))
         self.end_headers()
-        out.write(data)
+
+        self.wfile.write(data)
+
 
 def main():
-    address = ('', 8080,)
-    server = BaseHTTPServer.HTTPServer(address, PILHandler)
-    server.serve_forever()
+    try:
+        address = ('', 8080,)
+        server = BaseHTTPServer.HTTPServer(address, PILHandler)
+        server.serve_forever()
+    except:
+        return -1
+    return 0
 
 if __name__ == '__main__':
     sys.exit(main())