netrender

Bugfix for job cancellation (reported by Carsten in email)
Ended up recoding part of the communication pipe (use json more consistently)
Fix bpy data modifications where it shouldn't happen (as a bonus, thumbnailing is now done out of process)

release/scripts/io/netrender/slave.py

@@ -26,6 +26,7 @@ import bpy
 from netrender.utils import *
 import netrender.model
 import netrender.repath
+import netrender.thumbnail as thumbnail
 
 BLENDER_PATH = sys.argv[0]
 
@@ -304,7 +305,7 @@ def render_slave(engine, netsettings, threads):
 
                             # thumbnail first
                             if netsettings.use_slave_thumb:
-                                thumbname = thumbnail(filename)
+                                thumbname = thumbnail.generate(filename)
                                 
                                 if thumbname:
                                     f = open(thumbname, 'rb')