Full error handling

[invirt/packages/invirt-web.git] / code / view.py

diff --git a/code/view.py b/code/view.py
index d15d53f..6c9caf8 100644 (file)
--- a/code/view.py
+++ b/code/view.py
@@ -1,10 +1,11 @@
-import os
+import os, sys
 
 import cherrypy
 from mako.template import Template
 from mako.lookup import TemplateLookup
 import simplejson
 import datetime, decimal
+from StringIO import StringIO
 from invirt.config import structs as config
 from webcommon import State
 
@@ -27,10 +28,9 @@ class MakoLoader(object):
     
     def __init__(self):
         self.lookups = {}
-    
-    def __call__(self, filename, directories, module_directory=None,
-                 collection_size=-1, content_type='text/html; charset=utf-8',
-                 imports=[]):
+
+    def get_lookup(self, directories, module_directory=None,
+                     collection_size=-1, imports=[], **kwargs):
         # Find the appropriate template lookup.
         key = (tuple(directories), module_directory)
         try:
@@ -45,7 +45,13 @@ class MakoLoader(object):
                                     imports=imports,
                                     )
             self.lookups[key] = lookup
-        cherrypy.request.lookup = lookup
+        return lookup
+
+    def __call__(self, filename, directories, module_directory=None,
+                 collection_size=-1, content_type='text/html; charset=utf-8',
+                 imports=[]):
+        cherrypy.request.lookup = lookup = self.get_lookup(directories, module_directory,
+                                                           collection_size, imports)
         
         # Replace the current handler.
         cherrypy.request.template = t = lookup.get_template(filename)
@@ -54,6 +60,30 @@ class MakoLoader(object):
 main = MakoLoader()
 cherrypy.tools.mako = cherrypy.Tool('on_start_resource', main)
 
+def revertStandardError():
+    """Move stderr to stdout, and return the contents of the old stderr."""
+    errio = sys.stderr
+    if not isinstance(errio, StringIO):
+        return ''
+    sys.stderr = sys.stdout
+    errio.seek(0)
+    return errio.read()
+
+def catchStderr():
+    old_handler = cherrypy.request.handler
+    def wrapper(*args, **kwargs):
+        sys.stderr = StringIO()
+        ret = old_handler(*args, **kwargs)
+        e = revertStandardError()
+        if e:
+            if isinstance(ret, dict):
+                ret["error_text"] = e
+        return ret
+    if old_handler:
+        cherrypy.request.handler = wrapper
+
+cherrypy.tools.catch_stderr = cherrypy.Tool('before_handler', catchStderr)
+
 class JSONEncoder(simplejson.JSONEncoder):
        def default(self, obj):
                if isinstance(obj, datetime.datetime):