351 lines
11 KiB
Python
351 lines
11 KiB
Python
|
# -*- coding: utf-8 -*-
|
||
|
|
"""
|
||
|
|
jinja2.debug
|
||
|
|
~~~~~~~~~~~~
|
||
|
|
|
||
|
|
Implements the debug interface for Jinja. This module does some pretty
|
||
|
|
ugly stuff with the Python traceback system in order to achieve tracebacks
|
||
|
|
with correct line numbers, locals and contents.
|
||
|
|
|
||
|
|
:copyright: (c) 2010 by the Jinja Team.
|
||
|
|
:license: BSD, see LICENSE for more details.
|
||
|
|
"""
|
||
|
|
import sys
|
||
|
|
import traceback
|
||
|
|
from types import TracebackType, CodeType
|
||
|
|
from jinja2.utils import missing, internal_code
|
||
|
|
from jinja2.exceptions import TemplateSyntaxError
|
||
|
|
from jinja2._compat import iteritems, reraise, PY2
|
||
|
|
|
||
|
|
# on pypy we can take advantage of transparent proxies
|
||
|
|
try:
|
||
|
|
from __pypy__ import tproxy
|
||
|
|
except ImportError:
|
||
|
|
tproxy = None
|
||
|
|
|
||
|
|
|
||
|
|
# how does the raise helper look like?
|
||
|
|
try:
|
||
|
|
exec("raise TypeError, 'foo'")
|
||
|
|
except SyntaxError:
|
||
|
|
raise_helper = 'raise __jinja_exception__[1]'
|
||
|
|
except TypeError:
|
||
|
|
raise_helper = 'raise __jinja_exception__[0], __jinja_exception__[1]'
|
||
|
|
|
||
|
|
|
||
|
|
class TracebackFrameProxy(object):
|
||
|
|
"""Proxies a traceback frame."""
|
||
|
|
|
||
|
|
def __init__(self, tb):
|
||
|
|
self.tb = tb
|
||
|
|
self._tb_next = None
|
||
|
|
|
||
|
|
@property
|
||
|
|
def tb_next(self):
|
||
|
|
return self._tb_next
|
||
|
|
|
||
|
|
def set_next(self, next):
|
||
|
|
if tb_set_next is not None:
|
||
|
|
try:
|
||
|
|
tb_set_next(self.tb, next and next.tb or None)
|
||
|
|
except Exception:
|
||
|
|
# this function can fail due to all the hackery it does
|
||
|
|
# on various python implementations. We just catch errors
|
||
|
|
# down and ignore them if necessary.
|
||
|
|
pass
|
||
|
|
self._tb_next = next
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_jinja_frame(self):
|
||
|
|
return '__jinja_template__' in self.tb.tb_frame.f_globals
|
||
|
|
|
||
|
|
def __getattr__(self, name):
|
||
|
|
return getattr(self.tb, name)
|
||
|
|
|
||
|
|
|
||
|
|
def make_frame_proxy(frame):
|
||
|
|
proxy = TracebackFrameProxy(frame)
|
||
|
|
if tproxy is None:
|
||
|
|
return proxy
|
||
|
|
def operation_handler(operation, *args, **kwargs):
|
||
|
|
if operation in ('__getattribute__', '__getattr__'):
|
||
|
|
return getattr(proxy, args[0])
|
||
|
|
elif operation == '__setattr__':
|
||
|
|
proxy.__setattr__(*args, **kwargs)
|
||
|
|
else:
|
||
|
|
return getattr(proxy, operation)(*args, **kwargs)
|
||
|
|
return tproxy(TracebackType, operation_handler)
|
||
|
|
|
||
|
|
|
||
|
|
class ProcessedTraceback(object):
|
||
|
|
"""Holds a Jinja preprocessed traceback for printing or reraising."""
|
||
|
|
|
||
|
|
def __init__(self, exc_type, exc_value, frames):
|
||
|
|
assert frames, 'no frames for this traceback?'
|
||
|
|
self.exc_type = exc_type
|
||
|
|
self.exc_value = exc_value
|
||
|
|
self.frames = frames
|
||
|
|
|
||
|
|
# newly concatenate the frames (which are proxies)
|
||
|
|
prev_tb = None
|
||
|
|
for tb in self.frames:
|
||
|
|
if prev_tb is not None:
|
||
|
|
prev_tb.set_next(tb)
|
||
|
|
prev_tb = tb
|
||
|
|
prev_tb.set_next(None)
|
||
|
|
|
||
|
|
def render_as_text(self, limit=None):
|
||
|
|
"""Return a string with the traceback."""
|
||
|
|
lines = traceback.format_exception(self.exc_type, self.exc_value,
|
||
|
|
self.frames[0], limit=limit)
|
||
|
|
return ''.join(lines).rstrip()
|
||
|
|
|
||
|
|
def render_as_html(self, full=False):
|
||
|
|
"""Return a unicode string with the traceback as rendered HTML."""
|
||
|
|
from jinja2.debugrenderer import render_traceback
|
||
|
|
return u'%s\n\n<!--\n%s\n-->' % (
|
||
|
|
render_traceback(self, full=full),
|
||
|
|
self.render_as_text().decode('utf-8', 'replace')
|
||
|
|
)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def is_template_syntax_error(self):
|
||
|
|
"""`True` if this is a template syntax error."""
|
||
|
|
return isinstance(self.exc_value, TemplateSyntaxError)
|
||
|
|
|
||
|
|
@property
|
||
|
|
def exc_info(self):
|
||
|
|
"""Exception info tuple with a proxy around the frame objects."""
|
||
|
|
return self.exc_type, self.exc_value, self.frames[0]
|
||
|
|
|
||
|
|
@property
|
||
|
|
def standard_exc_info(self):
|
||
|
|
"""Standard python exc_info for re-raising"""
|
||
|
|
tb = self.frames[0]
|
||
|
|
# the frame will be an actual traceback (or transparent proxy) if
|
||
|
|
# we are on pypy or a python implementation with support for tproxy
|
||
|
|
if type(tb) is not TracebackType:
|
||
|
|
tb = tb.tb
|
||
|
|
return self.exc_type, self.exc_value, tb
|
||
|
|
|
||
|
|
|
||
|
|
def make_traceback(exc_info, source_hint=None):
|
||
|
|
"""Creates a processed traceback object from the exc_info."""
|
||
|
|
exc_type, exc_value, tb = exc_info
|
||
|
|
if isinstance(exc_value, TemplateSyntaxError):
|
||
|
|
exc_info = translate_syntax_error(exc_value, source_hint)
|
||
|
|
initial_skip = 0
|
||
|
|
else:
|
||
|
|
initial_skip = 1
|
||
|
|
return translate_exception(exc_info, initial_skip)
|
||
|
|
|
||
|
|
|
||
|
|
def translate_syntax_error(error, source=None):
|
||
|
|
"""Rewrites a syntax error to please traceback systems."""
|
||
|
|
error.source = source
|
||
|
|
error.translated = True
|
||
|
|
exc_info = (error.__class__, error, None)
|
||
|
|
filename = error.filename
|
||
|
|
if filename is None:
|
||
|
|
filename = '<unknown>'
|
||
|
|
return fake_exc_info(exc_info, filename, error.lineno)
|
||
|
|
|
||
|
|
|
||
|
|
def translate_exception(exc_info, initial_skip=0):
|
||
|
|
"""If passed an exc_info it will automatically rewrite the exceptions
|
||
|
|
all the way down to the correct line numbers and frames.
|
||
|
|
"""
|
||
|
|
tb = exc_info[2]
|
||
|
|
frames = []
|
||
|
|
|
||
|
|
# skip some internal frames if wanted
|
||
|
|
for x in range(initial_skip):
|
||
|
|
if tb is not None:
|
||
|
|
tb = tb.tb_next
|
||
|
|
initial_tb = tb
|
||
|
|
|
||
|
|
while tb is not None:
|
||
|
|
# skip frames decorated with @internalcode. These are internal
|
||
|
|
# calls we can't avoid and that are useless in template debugging
|
||
|
|
# output.
|
||
|
|
if tb.tb_frame.f_code in internal_code:
|
||
|
|
tb = tb.tb_next
|
||
|
|
continue
|
||
|
|
|
||
|
|
# save a reference to the next frame if we override the current
|
||
|
|
# one with a faked one.
|
||
|
|
next = tb.tb_next
|
||
|
|
|
||
|
|
# fake template exceptions
|
||
|
|
template = tb.tb_frame.f_globals.get('__jinja_template__')
|
||
|
|
if template is not None:
|
||
|
|
lineno = template.get_corresponding_lineno(tb.tb_lineno)
|
||
|
|
tb = fake_exc_info(exc_info[:2] + (tb,), template.filename,
|
||
|
|
lineno)[2]
|
||
|
|
|
||
|
|
frames.append(make_frame_proxy(tb))
|
||
|
|
tb = next
|
||
|
|
|
||
|
|
# if we don't have any exceptions in the frames left, we have to
|
||
|
|
# reraise it unchanged.
|
||
|
|
# XXX: can we backup here? when could this happen?
|
||
|
|
if not frames:
|
||
|
|
reraise(exc_info[0], exc_info[1], exc_info[2])
|
||
|
|
|
||
|
|
return ProcessedTraceback(exc_info[0], exc_info[1], frames)
|
||
|
|
|
||
|
|
|
||
|
|
def fake_exc_info(exc_info, filename, lineno):
|
||
|
|
"""Helper for `translate_exception`."""
|
||
|
|
exc_type, exc_value, tb = exc_info
|
||
|
|
|
||
|
|
# figure the real context out
|
||
|
|
if tb is not None:
|
||
|
|
real_locals = tb.tb_frame.f_locals.copy()
|
||
|
|
ctx = real_locals.get('context')
|
||
|
|
if ctx:
|
||
|
|
locals = ctx.get_all()
|
||
|
|
else:
|
||
|
|
locals = {}
|
||
|
|
for name, value in iteritems(real_locals):
|
||
|
|
if name.startswith('l_') and value is not missing:
|
||
|
|
locals[name[2:]] = value
|
||
|
|
|
||
|
|
# if there is a local called __jinja_exception__, we get
|
||
|
|
# rid of it to not break the debug functionality.
|
||
|
|
locals.pop('__jinja_exception__', None)
|
||
|
|
else:
|
||
|
|
locals = {}
|
||
|
|
|
||
|
|
# assamble fake globals we need
|
||
|
|
globals = {
|
||
|
|
'__name__': filename,
|
||
|
|
'__file__': filename,
|
||
|
|
'__jinja_exception__': exc_info[:2],
|
||
|
|
|
||
|
|
# we don't want to keep the reference to the template around
|
||
|
|
# to not cause circular dependencies, but we mark it as Jinja
|
||
|
|
# frame for the ProcessedTraceback
|
||
|
|
'__jinja_template__': None
|
||
|
|
}
|
||
|
|
|
||
|
|
# and fake the exception
|
||
|
|
code = compile('\n' * (lineno - 1) + raise_helper, filename, 'exec')
|
||
|
|
|
||
|
|
# if it's possible, change the name of the code. This won't work
|
||
|
|
# on some python environments such as google appengine
|
||
|
|
try:
|
||
|
|
if tb is None:
|
||
|
|
location = 'template'
|
||
|
|
else:
|
||
|
|
function = tb.tb_frame.f_code.co_name
|
||
|
|
if function == 'root':
|
||
|
|
location = 'top-level template code'
|
||
|
|
elif function.startswith('block_'):
|
||
|
|
location = 'block "%s"' % function[6:]
|
||
|
|
else:
|
||
|
|
location = 'template'
|
||
|
|
|
||
|
|
if PY2:
|
||
|
|
code = CodeType(0, code.co_nlocals, code.co_stacksize,
|
||
|
|
code.co_flags, code.co_code, code.co_consts,
|
||
|
|
code.co_names, code.co_varnames, filename,
|
||
|
|
location, code.co_firstlineno,
|
||
|
|
code.co_lnotab, (), ())
|
||
|
|
else:
|
||
|
|
code = CodeType(0, code.co_kwonlyargcount,
|
||
|
|
code.co_nlocals, code.co_stacksize,
|
||
|
|
code.co_flags, code.co_code, code.co_consts,
|
||
|
|
code.co_names, code.co_varnames, filename,
|
||
|
|
location, code.co_firstlineno,
|
||
|
|
code.co_lnotab, (), ())
|
||
|
|
except Exception as e:
|
||
|
|
pass
|
||
|
|
|
||
|
|
# execute the code and catch the new traceback
|
||
|
|
try:
|
||
|
|
exec(code, globals, locals)
|
||
|
|
except:
|
||
|
|
exc_info = sys.exc_info()
|
||
|
|
new_tb = exc_info[2].tb_next
|
||
|
|
|
||
|
|
# return without this frame
|
||
|
|
return exc_info[:2] + (new_tb,)
|
||
|
|
|
||
|
|
|
||
|
|
def _init_ugly_crap():
|
||
|
|
"""This function implements a few ugly things so that we can patch the
|
||
|
|
traceback objects. The function returned allows resetting `tb_next` on
|
||
|
|
any python traceback object. Do not attempt to use this on non cpython
|
||
|
|
interpreters
|
||
|
|
"""
|
||
|
|
import ctypes
|
||
|
|
from types import TracebackType
|
||
|
|
|
||
|
|
if PY2:
|
||
|
|
# figure out size of _Py_ssize_t for Python 2:
|
||
|
|
if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'):
|
||
|
|
_Py_ssize_t = ctypes.c_int64
|
||
|
|
else:
|
||
|
|
_Py_ssize_t = ctypes.c_int
|
||
|
|
else:
|
||
|
|
# platform ssize_t on Python 3
|
||
|
|
_Py_ssize_t = ctypes.c_ssize_t
|
||
|
|
|
||
|
|
# regular python
|
||
|
|
class _PyObject(ctypes.Structure):
|
||
|
|
pass
|
||
|
|
_PyObject._fields_ = [
|
||
|
|
('ob_refcnt', _Py_ssize_t),
|
||
|
|
('ob_type', ctypes.POINTER(_PyObject))
|
||
|
|
]
|
||
|
|
|
||
|
|
# python with trace
|
||
|
|
if hasattr(sys, 'getobjects'):
|
||
|
|
class _PyObject(ctypes.Structure):
|
||
|
|
pass
|
||
|
|
_PyObject._fields_ = [
|
||
|
|
('_ob_next', ctypes.POINTER(_PyObject)),
|
||
|
|
('_ob_prev', ctypes.POINTER(_PyObject)),
|
||
|
|
('ob_refcnt', _Py_ssize_t),
|
||
|
|
('ob_type', ctypes.POINTER(_PyObject))
|
||
|
|
]
|
||
|
|
|
||
|
|
class _Traceback(_PyObject):
|
||
|
|
pass
|
||
|
|
_Traceback._fields_ = [
|
||
|
|
('tb_next', ctypes.POINTER(_Traceback)),
|
||
|
|
('tb_frame', ctypes.POINTER(_PyObject)),
|
||
|
|
('tb_lasti', ctypes.c_int),
|
||
|
|
('tb_lineno', ctypes.c_int)
|
||
|
|
]
|
||
|
|
|
||
|
|
def tb_set_next(tb, next):
|
||
|
|
"""Set the tb_next attribute of a traceback object."""
|
||
|
|
if not (isinstance(tb, TracebackType) and
|
||
|
|
(next is None or isinstance(next, TracebackType))):
|
||
|
|
raise TypeError('tb_set_next arguments must be traceback objects')
|
||
|
|
obj = _Traceback.from_address(id(tb))
|
||
|
|
if tb.tb_next is not None:
|
||
|
|
old = _Traceback.from_address(id(tb.tb_next))
|
||
|
|
old.ob_refcnt -= 1
|
||
|
|
if next is None:
|
||
|
|
obj.tb_next = ctypes.POINTER(_Traceback)()
|
||
|
|
else:
|
||
|
|
next = _Traceback.from_address(id(next))
|
||
|
|
next.ob_refcnt += 1
|
||
|
|
obj.tb_next = ctypes.pointer(next)
|
||
|
|
|
||
|
|
return tb_set_next
|
||
|
|
|
||
|
|
|
||
|
|
# try to get a tb_set_next implementation if we don't have transparent
|
||
|
|
# proxies.
|
||
|
|
tb_set_next = None
|
||
|
|
if tproxy is None:
|
||
|
|
try:
|
||
|
|
tb_set_next = _init_ugly_crap()
|
||
|
|
except:
|
||
|
|
pass
|
||
|
|
del _init_ugly_crap
|