allow a cllback in streamer

applications/examples/static/css/stupid.css

@@ -312,8 +312,8 @@ a:not(.btn):not(.noeffect):after {
 
 /*** accordion ***/
 .accordion>label{cursor:pointer}
-.accordion>input ~ label:before {content:"▲ "; color:#ddd}
-.accordion>input:checked ~ label:before {content:"▼ "; color:#ddd}
+.accordion>input ~ label:before {content:"\25b2"; color:#ddd}
+.accordion>input:checked ~ label:before {content:"\25bc"; color:#ddd}
 .accordion>input {display:none}
 .accordion>input:checked ~ *:not(label) {
   max-height: 1000px !important;

gluon/streamer.py

@@ -25,22 +25,25 @@ regex_stop_range = re.compile('(?<=\-)\d+')
 
 DEFAULT_CHUNK_SIZE = 64 * 1024
 
-def streamer(stream, chunk_size=DEFAULT_CHUNK_SIZE, bytes=None):
-    offset = 0
-    while bytes is None or offset < bytes:
-        if not bytes is None and bytes - offset < chunk_size:
-            chunk_size = bytes - offset
-        data = stream.read(chunk_size)
-        length = len(data)
-        if not length:
-            break
-        else:
-            yield data
-        if length < chunk_size:
-            break
-        offset += length
-    stream.close()
-
+def streamer(stream, chunk_size=DEFAULT_CHUNK_SIZE, bytes=None, callback=None):
+    try:
+        offset = 0
+        while bytes is None or offset < bytes:
+            if not bytes is None and bytes - offset < chunk_size:
+                chunk_size = bytes - offset
+            data = stream.read(chunk_size)
+            length = len(data)
+            if not length:
+                break
+            else:
+                yield data
+            if length < chunk_size:
+                break
+            offset += length
+    finally:
+        stream.close()
+        if callback:
+            callback()
 
 def stream_file_or_304_or_206(
     static_file,

scripts/setup-web2py-nginx-uwsgi-ubuntu.sh

@@ -214,18 +214,18 @@ then
 fi
 
 /etc/init.d/nginx start
-start uwsgi-emperor
+systemctl start emperor.uwsgi.service
 
 echo <<EOF
 you can stop uwsgi and nginx with
 
   sudo /etc/init.d/nginx stop
-  sudo stop uwsgi-emperor
+  sudo systemctl start emperor.uwsgi.service
  
 and start it with
 
   sudo /etc/init.d/nginx start
-  sudo start uwsgi-emperor
+  systemctl start emperor.uwsgi.service
 
 EOF