dsnrun

Ad hoc utility to rerun a Python script, but with the sentry_sdk initialized to a specific DSN.

Bring the awesome experience of your error tracking software to ad hoc scripts and tools, non-production scripts and scripts that you cannot easily edit.

Installation & Usage

$ pip install dsnrun
[...]

$ dsnrun -h
Usage: dsnrun [dsn] [-m module | filename] [args...]

To use this, just rewrite your python invocations, i.e.

# normal Python
$ python -m failingmodule
[..stacktrace..]

# becomes
$ dsnrun -m failingmodule

# normal Python
$ python /tmp/failingmodule.py
[..stacktrace..]

# becomes
$ dsnrun /tmp/failingmodule.py

Now, visit your Error Tracker and get a much prettier stacktrace (including local variables).

Rationale

At Bugsink, we like our Error Tracking so much, that we even use it for local development. (Why wouldn't we: setup is trivial).

If you like Python, you probably do a lot with Python, including things for which you dind't plan on setting up your Error Tracker. Still, you occasionally mess up, leading to a stack trace on-screen.

What if that stacktrace was as awesome as the one in your error tracker?

Features

• Because we use runpy to run the script, it should work with any Python script that you can run with python -m or python filename.py. i.e. any if __name__ == '__main__': block will still work as expected.

Limitations

Don't use this to set up sentry_dsn for your actual production code. We shouldn't have to explain why, but the gist of it is: There may very well be edge cases that trip this thing up, and why would you break production if you can just add a few lines to your actual production code?

These are current limitations, meaning we might as well improve the script if it turns out to be useful:

• the on-screen (printed) stacktrace for dsnrun is not equal to the regular-python version; it also contains dsnrun itself and the functions it invokes. The event as sent to your DSN does not contain these though (we prune it).

• dsn is the only currently supported argument to sentry_sdk.init. For future versions I'll put in the work of translating CLI args to SDK args.

• dsnrun manually patches sys.argv such that the invoked script does not get dsnrun's arguments passed to it. This "seems to work" (but may not generally work). However, I did not find a way to "properly do this". See https://bugs.python.org/issue26388

• If you mistype the thing-to-run you'll send an ImportError to your DSN. This is not filtered out (yet). Examples:

ImportError: No module named nosuchmodule

FileNotFoundError: [Errno 2] No such file or directory: '/tmp/nosuchfile.py'