On Wed, 9 Dec 2020 at 01:55, James Cook <[email protected]> wrote:
> I've noticed that sometimes when plugin code triggers a runtime error, I
> don't get a stack trace. Here's a made-up minimal-ish example:
>
> from beancount.core import amount, data, number
> __plugins__ = ("foo",)
> def foo(entries, _options):
> return [data.Transaction(
> flag = "*",
> payee = None,
> narration = "",
> tags = "",
> links = set(),
> postings = [data.Posting("Equity:Foo",
> amount.Amount(number.D("10"), "CAD") + "X", None, None, None, None)]
> )], ()
>
> If I run bean-check on a file that imports that plugin, I just get this
> output:
>
> falsifian angel beancount $ PYTHONPATH=./plugins bean-check main.beancount
>
> <load>:0: Error importing "foo": can only concatenate tuple (not
> "str") to tuple
>
> On the other hand, if I replace the body of foo() with 'raise
> BaseException("error")', I get a nice stack trace:
>
> falsifian angel beancount $ PYTHONPATH=./plugins bean-check main.beancount
>
> Traceback (most recent call last):
> File "/home/falsifian/.local/bin/bean-check", line 11, in <module>
> load_entry_point('beancount==2.3.3', 'console_scripts', 'bean-check')()
> File
> "/home/falsifian/.local/lib/python3.8/site-packages/beancount/scripts/check.py",
> line 49, in main
> entries, errors, _ = loader.load_file(
> File
> "/home/falsifian/.local/lib/python3.8/site-packages/beancount/loader.py",
> line 89, in load_file
> entries, errors, options_map = _load_file(
> File
> "/home/falsifian/.local/lib/python3.8/site-packages/beancount/loader.py",
> line 214, in wrapped
> result = function(toplevel_filename, *args, **kw)
> File
> "/home/falsifian/.local/lib/python3.8/site-packages/beancount/loader.py",
> line 255, in _uncached_loa
> d_file
> return _load([(filename, True)], *args, **kw)
> File
> "/home/falsifian/.local/lib/python3.8/site-packages/beancount/loader.py",
> line 510, in _load
> entries, errors = run_transformations(entries, parse_errors,
> options_map,
> File
> "/home/falsifian/.local/lib/python3.8/site-packages/beancount/loader.py",
> line 588, in run_transform
> ations
> entries, plugin_errors = callback(entries, options_map)
> File
> "/home/falsifian/w/colin_and_james/accounting/beancount/plugins/foo.py",
> line 4, in foo
> raise BaseException("error")
> BaseException: error
>
> Why does that happen? Is there a way I can get a stack trace more
> consistently? It would help me debug.
>
> James
>
I mostly answered my own question. If I really want a traceback, I can just
catch the exception before foo() returns. Hacky example that uses
traceback.format_exc() to show the stack trace:
from beancount.core import amount, data, number
import traceback
__plugins__ = ("foo",)
def foo(entries, _options):
try:
return [data.Transaction(
flag = "*",
payee = None,
narration = "",
tags = "",
links = set(),
postings = [data.Posting("Equity:Foo",
amount.Amount(number.D("10"), "CAD") + "X", None, None, None, None)]
)], ()
except BaseException:
traceback.format_exc()
raise BaseException("error")
James
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