benchmark/setup.py

import os
import posixpath
import re
import shutil
import sys

from distutils import sysconfig
import setuptools
from setuptools.command import build_ext


HERE = os.path.dirname(os.path.abspath(__file__))


IS_WINDOWS = sys.platform.startswith('win')


def _get_version():
    """Parse the version string from __init__.py."""
    with open(os.path.join(
            HERE, 'bindings', 'python', 'google_benchmark', '__init__.py')) as init_file:
        try:
            version_line = next(
                line for line in init_file if line.startswith('__version__'))
        except StopIteration:
            raise ValueError('__version__ not defined in __init__.py')
        else:
            namespace = {}
            exec(version_line, namespace)  # pylint: disable=exec-used
            return namespace['__version__']


def _parse_requirements(path):
    with open(os.path.join(HERE, path)) as requirements:
        return [
            line.rstrip() for line in requirements
            if not (line.isspace() or line.startswith('#'))
        ]


class BazelExtension(setuptools.Extension):
    """A C/C++ extension that is defined as a Bazel BUILD target."""

    def __init__(self, name, bazel_target):
        self.bazel_target = bazel_target
        self.relpath, self.target_name = (
            posixpath.relpath(bazel_target, '//').split(':'))
        setuptools.Extension.__init__(self, name, sources=[])


class BuildBazelExtension(build_ext.build_ext):
    """A command that runs Bazel to build a C/C++ extension."""

    def run(self):
        for ext in self.extensions:
            self.bazel_build(ext)
        build_ext.build_ext.run(self)

    def bazel_build(self, ext):
        """Runs the bazel build to create the package."""
        with open('WORKSPACE', 'r') as workspace:
            workspace_contents = workspace.read()

        with open('WORKSPACE', 'w') as workspace:
            workspace.write(re.sub(
                r'(?<=path = ").*(?=",  # May be overwritten by setup\.py\.)',
                sysconfig.get_python_inc().replace(os.path.sep, posixpath.sep),
                workspace_contents))

        if not os.path.exists(self.build_temp):
            os.makedirs(self.build_temp)

        bazel_argv = [
            'bazel',
            'build',
            ext.bazel_target,
            '--symlink_prefix=' + os.path.join(self.build_temp, 'bazel-'),
            '--compilation_mode=' + ('dbg' if self.debug else 'opt'),
        ]

        if IS_WINDOWS:
            # Link with python*.lib.
            for library_dir in self.library_dirs:
                bazel_argv.append('--linkopt=/LIBPATH:' + library_dir)

        self.spawn(bazel_argv)

        shared_lib_suffix = '.dll' if IS_WINDOWS else '.so'
        ext_bazel_bin_path = os.path.join(
            self.build_temp, 'bazel-bin',
            ext.relpath, ext.target_name + shared_lib_suffix)
        ext_dest_path = self.get_ext_fullpath(ext.name)
        ext_dest_dir = os.path.dirname(ext_dest_path)
        if not os.path.exists(ext_dest_dir):
            os.makedirs(ext_dest_dir)
        shutil.copyfile(ext_bazel_bin_path, ext_dest_path)


setuptools.setup(
    name='google_benchmark',
    version=_get_version(),
    url='https://github.com/google/benchmark',
    description='A library to benchmark code snippets.',
    author='Google',
    author_email='benchmark-py@google.com',
    # Contained modules and scripts.
    package_dir={'': 'bindings/python'},
    packages=setuptools.find_packages('bindings/python'),
    install_requires=_parse_requirements('bindings/python/requirements.txt'),
    cmdclass=dict(build_ext=BuildBazelExtension),
    ext_modules=[BazelExtension(
        'google_benchmark._benchmark', '//bindings/python/google_benchmark:_benchmark')],
    zip_safe=False,
    # PyPI package information.
    classifiers=[
        'Development Status :: 4 - Beta',
        'Intended Audience :: Developers',
        'Intended Audience :: Science/Research',
        'License :: OSI Approved :: Apache Software License',
        'Programming Language :: Python :: 3.6',
        'Programming Language :: Python :: 3.7',
        'Programming Language :: Python :: 3.8',
        'Topic :: Software Development :: Testing',
        'Topic :: System :: Benchmark',
    ],
    license='Apache 2.0',
    keywords='benchmark',
)