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# Copyright 2017 The Bazel Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The whl modules defines classes for interacting with Python packages."""
import argparse
import json
import os
import pkg_resources
import re
import zipfile
class Wheel(object):
def __init__(self, path):
self._path = path
def path(self):
return self._path
def basename(self):
return os.path.basename(self.path())
def distribution(self):
# See https://www.python.org/dev/peps/pep-0427/#file-name-convention
parts = self.basename().split('-')
return parts[0]
def version(self):
# See https://www.python.org/dev/peps/pep-0427/#file-name-convention
parts = self.basename().split('-')
return parts[1]
def repository_name(self):
# Returns the canonical name of the Bazel repository for this package.
canonical = 'pypi__{}_{}'.format(self.distribution(), self.version())
# Escape any illegal characters with underscore.
return re.sub('[-.+]', '_', canonical)
def _dist_info(self):
# Return the name of the dist-info directory within the .whl file.
# e.g. google_cloud-0.27.0-py2.py3-none-any.whl ->
# google_cloud-0.27.0.dist-info
return '{}-{}.dist-info'.format(self.distribution(), self.version())
def metadata(self):
# Extract the structured data from metadata.json in the WHL's dist-info
# directory.
with zipfile.ZipFile(self.path(), 'r') as whl:
# first check for metadata.json
try:
with whl.open(self._dist_info() + '/metadata.json') as f:
return json.loads(f.read().decode("utf-8"))
except KeyError:
pass
# fall back to METADATA file (https://www.python.org/dev/peps/pep-0427/)
with whl.open(self._dist_info() + '/METADATA') as f:
return self._parse_metadata(f.read().decode("utf-8"))
def name(self):
return self.metadata().get('name')
def dependencies(self, extra=None):
"""Access the dependencies of this Wheel.
Args:
extra: if specified, include the additional dependencies
of the named "extra".
Yields:
the names of requirements from the metadata.json
"""
# TODO(mattmoor): Is there a schema to follow for this?
run_requires = self.metadata().get('run_requires', [])
for requirement in run_requires:
if requirement.get('extra') != extra:
# Match the requirements for the extra we're looking for.
continue
marker = requirement.get('environment')
if marker and not pkg_resources.evaluate_marker(marker):
# The current environment does not match the provided PEP 508 marker,
# so ignore this requirement.
continue
requires = requirement.get('requires', [])
for entry in requires:
# Strip off any trailing versioning data.
parts = re.split('[ ><=()]', entry)
yield parts[0]
def extras(self):
return self.metadata().get('extras', [])
def expand(self, directory):
with zipfile.ZipFile(self.path(), 'r') as whl:
whl.extractall(directory)
# _parse_metadata parses METADATA files according to https://www.python.org/dev/peps/pep-0314/
def _parse_metadata(self, content):
# TODO: handle fields other than just name
name_pattern = re.compile('Name: (.*)')
return { 'name': name_pattern.search(content).group(1) }
parser = argparse.ArgumentParser(
description='Unpack a WHL file as a py_library.')
parser.add_argument('--whl', action='store',
help=('The .whl file we are expanding.'))
parser.add_argument('--requirements', action='store',
help='The pip_import from which to draw dependencies.')
parser.add_argument('--directory', action='store', default='.',
help='The directory into which to expand things.')
parser.add_argument('--extras', action='append',
help='The set of extras for which to generate library targets.')
def main():
args = parser.parse_args()
whl = Wheel(args.whl)
# Extract the files into the current directory
whl.expand(args.directory)
with open(os.path.join(args.directory, 'BUILD'), 'w') as f:
f.write("""
package(default_visibility = ["//visibility:public"])
load("{requirements}", "requirement")
py_library(
name = "pkg",
srcs = glob(["**/*.py"]),
data = glob(["**/*"], exclude=["**/*.py", "**/* *", "BUILD", "WORKSPACE"]),
# This makes this directory a top-level in the python import
# search path for anything that depends on this.
imports = ["."],
deps = [{dependencies}],
)
{extras}""".format(
requirements=args.requirements,
dependencies=','.join([
'requirement("%s")' % d
for d in whl.dependencies()
]),
extras='\n\n'.join([
"""py_library(
name = "{extra}",
deps = [
":pkg",{deps}
],
)""".format(extra=extra,
deps=','.join([
'requirement("%s")' % dep
for dep in whl.dependencies(extra)
]))
for extra in args.extras or []
])))
if __name__ == '__main__':
main()