Expand self

A common problem with object oriented code is that the crash logs in sentry don’t contain the relevant variables because they live on self. So instead of “a = 2, b = 3” you’d get “self = <SomeClass at 0xdeadmeat>”. This makes it much more difficult to reproduce and fix the bug. We could instead expand members of self that have been used! Proof of concept looks something like this:

from __future__ import print_function
import inspect
import re

class Foo(object):
    def __init__(self):
        self.a = 1
        self.b = 2
        self.c = 3
        self.d = 6

    def foo(self):
        x = self.c + self.d
        raise Exception()

def format_stack(frame):
    frame_info = inspect.getframeinfo(frame)

    print('---- %s:%s ----' % (frame_info.filename, frame_info.lineno))
    for k, v in frame.tb_frame.f_locals.items():
        print('%s: %s' % (k, v))
        if k == 'self':
            source = inspect.getsource(frame)
            for self_member in re.findall(r'self\.(\w)', source):
                print('self.%s: %s' % (self_member, getattr(v, self_member)))


    if frame.tb_next:
        format_stack(frame)

try:
    Foo().foo()
except Exception as e:
    import sys
    tb = sys.exc_info()[2]
    format_stack(tb.tb_next)

[boxed]

This is still very important.

[github-actions[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone … forever!

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“A weed is but an unloved flower.” ― Ella Wheeler Wilcox 🥀