This is a private clone of https://github.com/mattrobenolt/python-sourcemap so we can build package distributions from it pinned to the version we use.

As of 2022-12-02, there should be a version on our Python private registry built and ready to use: https://pypi.rollbar.tools

This corresponds to the commit pinned as a dependency for mox at the time of writing: 05735efbd5c8cdcaff0c2ca3b341dafc3d1dbadb And it's marked as 0.3.0+05735ef.

It has been build following this procedure, which can be replicated if we ever need to switch to a more recent version or push a patch to it. You'll need the username and password of the registry's write user to publish. The credentials are on LastPass, under the devpi rollbar user entry.

Export these environment variables to use with twine later:

export TWINE_USERNAME=rollbar
export TWINE_PASSWORD=......  # get it from LastPass

Now:

• checkout the repo to the commit or tag you need
• modify sourcemap/__init__.py to reflect the new version. Always append the +HASH to the version in order not to conflict with upstream.
• launch a shell into a docker image with Python 2.7 support (password is the base64 string from before): docker run -ti --rm -v $(pwd):/app -e TWINE_USERNAME=$TWINE_USERNAME -e TWINE_PASSWORD=$TWINE_PASSWORD cimg/python:2.7 /bin/bash
• launch the included ./tools/build_and_publish.sh script

Parse JavaScript source maps.

Based on https://github.com/martine/python-sourcemap

$ pip install sourcemap

>>> import sourcemap
>>> sourcemap.discover('...')
'jquery.min.map'
>>> index = sourcemap.loads('...')
>>> index.lookup(line=10, column=10)
<Token: dst_line=10 dst_column=10 src='jquery.js' src_line=50 src_col=200 name='lol'>

# Load in our original minified file
>>> minified = open('jquery.min.js').read()
# Discover the path to the source map
>>> map_path = sourcemap.discover(minified)
# Read and parse our sourcemap
>>> index = sourcemap.load(open(map_path))
# Look up the line/column from the minified file
>>> token = index.lookup(line=0, column=3040)
# Grab the line from the original source that this token points to
>>> source = open('jquery.js').readlines()
>>> culprit = source[token.src_line]
# 5 lines before
>>> pre_context = source[token.src_line - 5:token.src_line]
# 5 lines after
>>> post_context = source[token.src_line + 1:token.src_line + 6]

• Python 2.6
• Python 2.7
• Python 3.3
• Python 3.4
• Python 3.5
• PyPy
• PyPy3