Imported from SVN by Bitbucket

Paste-1.7.5.1-py2.6.egg/paste/cgitb_catcher.py

@@ -0,0 +1,116 @@
+# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
+# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
+
+"""
+WSGI middleware
+
+Captures any exceptions and prints a pretty report.  See the `cgitb
+documentation <http://python.org/doc/current/lib/module-cgitb.html>`_
+for more.
+"""
+
+import cgitb
+from cStringIO import StringIO
+import sys
+
+from paste.util import converters
+
+class NoDefault(object):
+    pass
+
+class CgitbMiddleware(object):
+
+    def __init__(self, app,
+                 global_conf=None,
+                 display=NoDefault,
+                 logdir=None,
+                 context=5,
+                 format="html"):
+        self.app = app
+        if global_conf is None:
+            global_conf = {}
+        if display is NoDefault:
+            display = global_conf.get('debug')
+        if isinstance(display, basestring):
+            display = converters.asbool(display)
+        self.display = display
+        self.logdir = logdir
+        self.context = int(context)
+        self.format = format
+
+    def __call__(self, environ, start_response):
+        try:
+            app_iter = self.app(environ, start_response)
+            return self.catching_iter(app_iter, environ)
+        except:
+            exc_info = sys.exc_info()
+            start_response('500 Internal Server Error',
+                           [('content-type', 'text/html')],
+                           exc_info)
+            response = self.exception_handler(exc_info, environ)
+            return [response]
+
+    def catching_iter(self, app_iter, environ):
+        if not app_iter:
+            raise StopIteration
+        error_on_close = False
+        try:
+            for v in app_iter:
+                yield v
+            if hasattr(app_iter, 'close'):
+                error_on_close = True
+                app_iter.close()
+        except:
+            response = self.exception_handler(sys.exc_info(), environ)
+            if not error_on_close and hasattr(app_iter, 'close'):
+                try:
+                    app_iter.close()
+                except:
+                    close_response = self.exception_handler(
+                        sys.exc_info(), environ)
+                    response += (
+                        '<hr noshade>Error in .close():<br>%s'
+                        % close_response)
+            yield response
+
+    def exception_handler(self, exc_info, environ):
+        dummy_file = StringIO()
+        hook = cgitb.Hook(file=dummy_file,
+                          display=self.display,
+                          logdir=self.logdir,
+                          context=self.context,
+                          format=self.format)
+        hook(*exc_info)
+        return dummy_file.getvalue()
+        
+def make_cgitb_middleware(app, global_conf,
+                          display=NoDefault,
+                          logdir=None,
+                          context=5,
+                          format='html'):
+    """
+    Wraps the application in the ``cgitb`` (standard library)
+    error catcher.
+        
+      display:
+        If true (or debug is set in the global configuration)
+        then the traceback will be displayed in the browser
+
+      logdir:
+        Writes logs of all errors in that directory
+
+      context:
+        Number of lines of context to show around each line of
+        source code
+    """
+    from paste.deploy.converters import asbool
+    if display is not NoDefault:
+        display = asbool(display)
+    if 'debug' in global_conf:
+        global_conf['debug'] = asbool(global_conf['debug'])
+    return CgitbMiddleware(
+        app, global_conf=global_conf,
+        display=display,
+        logdir=logdir,
+        context=context,
+        format=format)