Mercurial > p > roundup > code
annotate roundup/cgi/PageTemplates/PythonExpr.py @ 3896:fca0365521fc
ignore client shutdown exceptions when sending responses
patch from Ulrik Miaelsson
If the user clicks the stop button, or click another link before
the previous has finished loading, or something similar an IOError
exception will be raised which results in the admin being sent an
email.
This can understandably be pretty annoying if your users are
doing that on a regular basis. So we'll trap that exception
and ignore it.
| author | Justus Pendleton <jpend@users.sourceforge.net> |
|---|---|
| date | Tue, 11 Sep 2007 21:30:14 +0000 |
| parents | b43efe461b3e |
| children | 6e3e4f24c753 |
| rev | line source |
|---|---|
| 1049 | 1 ############################################################################## |
| 2 # | |
| 3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved. | |
|
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4 # |
| 1049 | 5 # This software is subject to the provisions of the Zope Public License, |
| 6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution. | |
| 7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED | |
| 8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS | |
| 10 # FOR A PARTICULAR PURPOSE | |
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11 # |
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12 ############################################################################## |
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parents:
2005
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13 # Modified for Roundup: |
| 1049 | 14 # |
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15 # 1. more informative traceback info |
| 1049 | 16 |
| 17 """Generic Python Expression Handler | |
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18 """ |
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Adhering to ZPL
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19 |
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20 __version__='$Revision: 1.6 $'[11:-2] |
| 1049 | 21 |
| 22 from TALES import CompilerError | |
| 23 from sys import exc_info | |
| 24 | |
| 25 class getSecurityManager: | |
| 26 '''Null security manager''' | |
| 27 def validate(self, *args, **kwargs): | |
| 28 return 1 | |
| 29 addContext = removeContext = validateValue = validate | |
| 30 | |
| 31 class PythonExpr: | |
| 32 def __init__(self, name, expr, engine): | |
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33 self.expr = expr = expr.strip().replace('\n', ' ') |
| 1049 | 34 try: |
| 35 d = {} | |
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36 exec 'def f():\n return %s\n' % expr.strip() in d |
| 1049 | 37 self._f = d['f'] |
| 38 except: | |
| 39 raise CompilerError, ('Python expression error:\n' | |
| 40 '%s: %s') % exc_info()[:2] | |
| 41 self._get_used_names() | |
| 42 | |
| 43 def _get_used_names(self): | |
| 44 self._f_varnames = vnames = [] | |
| 45 for vname in self._f.func_code.co_names: | |
| 46 if vname[0] not in '$_': | |
| 47 vnames.append(vname) | |
| 48 | |
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49 def _bind_used_names(self, econtext, _marker=[]): |
| 1049 | 50 # Bind template variables |
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51 names = {'CONTEXTS': econtext.contexts} |
| 1049 | 52 vars = econtext.vars |
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53 getType = econtext.getCompiler().getTypes().get |
| 1049 | 54 for vname in self._f_varnames: |
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55 val = vars.get(vname, _marker) |
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56 if val is _marker: |
| 1049 | 57 has = val = getType(vname) |
| 58 if has: | |
| 59 val = ExprTypeProxy(vname, val, econtext) | |
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60 names[vname] = val |
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parents:
2005
diff
changeset
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61 else: |
| 1049 | 62 names[vname] = val |
| 63 return names | |
| 64 | |
| 65 def __call__(self, econtext): | |
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much nicer error messages when there's a templating error
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66 __traceback_info__ = 'python expression "%s"'%self.expr |
| 1049 | 67 f = self._f |
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68 f.func_globals.update(self._bind_used_names(econtext)) |
| 1049 | 69 return f() |
| 70 | |
| 71 def __str__(self): | |
| 72 return 'Python expression "%s"' % self.expr | |
| 73 def __repr__(self): | |
| 74 return '<PythonExpr %s>' % self.expr | |
| 75 | |
| 76 class ExprTypeProxy: | |
| 77 '''Class that proxies access to an expression type handler''' | |
| 78 def __init__(self, name, handler, econtext): | |
| 79 self._name = name | |
| 80 self._handler = handler | |
| 81 self._econtext = econtext | |
| 82 def __call__(self, text): | |
| 83 return self._handler(self._name, text, | |
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parents:
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diff
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84 self._econtext.getCompiler())(self._econtext) |
| 1049 | 85 |