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bpo-45828: Use unraisable exceptions within sqlite3 callbacks (FH-29591)

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Erlend Egeberg Aasland 2021-11-29 16:22:32 +01:00 committed by GitHub
parent 6ac3c8a314
commit c4a69a4ad0
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6 changed files with 64 additions and 34 deletions
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24
Doc/library/sqlite3.rst
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@ -329,9 +329,27 @@ Module functions and constants
By default you will not get any tracebacks in user-defined functions,
aggregates, converters, authorizer callbacks etc. If you want to debug them,
you can call this function with *flag* set to ``True``. Afterwards, you will
get tracebacks from callbacks on ``sys.stderr``. Use :const:`False` to
disable the feature again.
you can call this function with *flag* set to :const:`True`. Afterwards, you
will get tracebacks from callbacks on :data:`sys.stderr`. Use :const:`False`
to disable the feature again.
Register an :func:`unraisable hook handler <sys.unraisablehook>` for an
improved debug experience::
>>> import sqlite3
>>> sqlite3.enable_callback_tracebacks(True)
>>> cx = sqlite3.connect(":memory:")
>>> cx.set_trace_callback(lambda stmt: 5/0)
>>> cx.execute("select 1")
Exception ignored in: <function <lambda> at 0x10b4e3ee0>
Traceback (most recent call last):
File "<stdin>", line 1, in <lambda>
ZeroDivisionError: division by zero
>>> import sys
>>> sys.unraisablehook = lambda unraisable: print(unraisable)
>>> cx.execute("select 1")
UnraisableHookArgs(exc_type=<class 'ZeroDivisionError'>, exc_value=ZeroDivisionError('division by zero'), exc_traceback=<traceback object at 0x10b559900>, err_msg=None, object=<function <lambda> at 0x10b4e3ee0>)
<sqlite3.Cursor object at 0x10b1fe840>
.. _sqlite3-connection-objects:

7
Doc/whatsnew/3.11.rst
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@ -248,7 +248,6 @@ sqlite3
(Contributed by Aviv Palivoda, Daniel Shahaf, and Erlend E. Aasland in
:issue:`16379` and :issue:`24139`.)
* Add :meth:`~sqlite3.Connection.setlimit` and
:meth:`~sqlite3.Connection.getlimit` to :class:`sqlite3.Connection` for
setting and getting SQLite limits by connection basis.
@ -258,6 +257,12 @@ sqlite3
threading mode the underlying SQLite library has been compiled with.
(Contributed by Erlend E. Aasland in :issue:`45613`.)
* :mod:`sqlite3` C callbacks now use unraisable exceptions if callback
tracebacks are enabled. Users can now register an
:func:`unraisable hook handler <sys.unraisablehook>` to improve their debug
experience.
(Contributed by Erlend E. Aasland in :issue:`45828`.)
threading
---------

4
Lib/test/test_sqlite3/test_hooks.py
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@ -197,7 +197,7 @@ class ProgressTests(unittest.TestCase):
con.execute("select 1 union select 2 union select 3").fetchall()
self.assertEqual(action, 0, "progress handler was not cleared")
@with_tracebacks(['bad_progress', 'ZeroDivisionError'])
@with_tracebacks(ZeroDivisionError, name="bad_progress")
def test_error_in_progress_handler(self):
con = sqlite.connect(":memory:")
def bad_progress():
@ -208,7 +208,7 @@ class ProgressTests(unittest.TestCase):
create table foo(a, b)
""")
@with_tracebacks(['__bool__', 'ZeroDivisionError'])
@with_tracebacks(ZeroDivisionError, name="bad_progress")
def test_error_in_progress_handler_result(self):
con = sqlite.connect(":memory:")
class BadBool:

59
Lib/test/test_sqlite3/test_userfunctions.py
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@ -25,46 +25,52 @@ import contextlib
import functools
import gc
import io
import re
import sys
import unittest
import unittest.mock
import sqlite3 as sqlite
from test.support import bigmemtest
from test.support import bigmemtest, catch_unraisable_exception
from .test_dbapi import cx_limit
def with_tracebacks(strings, traceback=True):
def with_tracebacks(exc, regex="", name=""):
"""Convenience decorator for testing callback tracebacks."""
if traceback:
strings.append('Traceback')
def decorator(func):
_regex = re.compile(regex) if regex else None
@functools.wraps(func)
def wrapper(self, *args, **kwargs):
# First, run the test with traceback enabled.
with check_tracebacks(self, strings):
func(self, *args, **kwargs)
with catch_unraisable_exception() as cm:
# First, run the test with traceback enabled.
with check_tracebacks(self, cm, exc, _regex, name):
func(self, *args, **kwargs)
# Then run the test with traceback disabled.
func(self, *args, **kwargs)
return wrapper
return decorator
@contextlib.contextmanager
def check_tracebacks(self, strings):
def check_tracebacks(self, cm, exc, regex, obj_name):
"""Convenience context manager for testing callback tracebacks."""
sqlite.enable_callback_tracebacks(True)
try:
buf = io.StringIO()
with contextlib.redirect_stderr(buf):
yield
tb = buf.getvalue()
for s in strings:
self.assertIn(s, tb)
self.assertEqual(cm.unraisable.exc_type, exc)
if regex:
msg = str(cm.unraisable.exc_value)
self.assertIsNotNone(regex.search(msg))
if obj_name:
self.assertEqual(cm.unraisable.object.__name__, obj_name)
finally:
sqlite.enable_callback_tracebacks(False)
def func_returntext():
return "foo"
def func_returntextwithnull():
@ -299,7 +305,7 @@ class FunctionTests(unittest.TestCase):
val = cur.fetchone()[0]
self.assertEqual(val, 1<<31)
@with_tracebacks(['func_raiseexception', '5/0', 'ZeroDivisionError'])
@with_tracebacks(ZeroDivisionError, name="func_raiseexception")
def test_func_exception(self):
cur = self.con.cursor()
with self.assertRaises(sqlite.OperationalError) as cm:
@ -307,14 +313,14 @@ class FunctionTests(unittest.TestCase):
cur.fetchone()
self.assertEqual(str(cm.exception), 'user-defined function raised exception')
@with_tracebacks(['func_memoryerror', 'MemoryError'])
@with_tracebacks(MemoryError, name="func_memoryerror")
def test_func_memory_error(self):
cur = self.con.cursor()
with self.assertRaises(MemoryError):
cur.execute("select memoryerror()")
cur.fetchone()
@with_tracebacks(['func_overflowerror', 'OverflowError'])
@with_tracebacks(OverflowError, name="func_overflowerror")
def test_func_overflow_error(self):
cur = self.con.cursor()
with self.assertRaises(sqlite.DataError):
@ -426,22 +432,21 @@ class FunctionTests(unittest.TestCase):
del x,y
gc.collect()
@with_tracebacks(OverflowError)
def test_func_return_too_large_int(self):
cur = self.con.cursor()
for value in 2**63, -2**63-1, 2**64:
self.con.create_function("largeint", 0, lambda value=value: value)
with check_tracebacks(self, ['OverflowError']):
with self.assertRaises(sqlite.DataError):
cur.execute("select largeint()")
with self.assertRaises(sqlite.DataError):
cur.execute("select largeint()")
@with_tracebacks(UnicodeEncodeError, "surrogates not allowed", "chr")
def test_func_return_text_with_surrogates(self):
cur = self.con.cursor()
self.con.create_function("pychr", 1, chr)
for value in 0xd8ff, 0xdcff:
with check_tracebacks(self,
['UnicodeEncodeError', 'surrogates not allowed']):
with self.assertRaises(sqlite.OperationalError):
cur.execute("select pychr(?)", (value,))
with self.assertRaises(sqlite.OperationalError):
cur.execute("select pychr(?)", (value,))
@unittest.skipUnless(sys.maxsize > 2**32, 'requires 64bit platform')
@bigmemtest(size=2**31, memuse=3, dry_run=False)
@ -510,7 +515,7 @@ class AggregateTests(unittest.TestCase):
val = cur.fetchone()[0]
self.assertEqual(str(cm.exception), "user-defined aggregate's 'finalize' method raised error")
@with_tracebacks(['__init__', '5/0', 'ZeroDivisionError'])
@with_tracebacks(ZeroDivisionError, name="AggrExceptionInInit")
def test_aggr_exception_in_init(self):
cur = self.con.cursor()
with self.assertRaises(sqlite.OperationalError) as cm:
@ -518,7 +523,7 @@ class AggregateTests(unittest.TestCase):
val = cur.fetchone()[0]
self.assertEqual(str(cm.exception), "user-defined aggregate's '__init__' method raised error")
@with_tracebacks(['step', '5/0', 'ZeroDivisionError'])
@with_tracebacks(ZeroDivisionError, name="AggrExceptionInStep")
def test_aggr_exception_in_step(self):
cur = self.con.cursor()
with self.assertRaises(sqlite.OperationalError) as cm:
@ -526,7 +531,7 @@ class AggregateTests(unittest.TestCase):
val = cur.fetchone()[0]
self.assertEqual(str(cm.exception), "user-defined aggregate's 'step' method raised error")
@with_tracebacks(['finalize', '5/0', 'ZeroDivisionError'])
@with_tracebacks(ZeroDivisionError, name="AggrExceptionInFinalize")
def test_aggr_exception_in_finalize(self):
cur = self.con.cursor()
with self.assertRaises(sqlite.OperationalError) as cm:
@ -643,11 +648,11 @@ class AuthorizerRaiseExceptionTests(AuthorizerTests):
raise ValueError
return sqlite.SQLITE_OK
@with_tracebacks(['authorizer_cb', 'ValueError'])
@with_tracebacks(ValueError, name="authorizer_cb")
def test_table_access(self):
super().test_table_access()
@with_tracebacks(['authorizer_cb', 'ValueError'])
@with_tracebacks(ValueError, name="authorizer_cb")
def test_column_access(self):
super().test_table_access()

2
Misc/NEWS.d/next/Library/2021-11-17-11-40-21.bpo-45828.kQU35U.rst Normal file
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@ -0,0 +1,2 @@
:mod:`sqlite` C callbacks now use unraisable exceptions if callback
tracebacks are enabled. Patch by Erlend E. Aasland.

2
Modules/_sqlite/connection.c
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@ -691,7 +691,7 @@ print_or_clear_traceback(callback_context *ctx)
assert(ctx != NULL);
assert(ctx->state != NULL);
if (ctx->state->enable_callback_tracebacks) {
PyErr_Print();
PyErr_WriteUnraisable(ctx->callable);
}
else {
PyErr_Clear();