setup.py

#  Copyright (c) 2022.  NetFoundry, Inc.
#
#  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
#
#  https://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.

import platform
from setuptools import setup
from setuptools.command.build_ext import build_ext
from setuptools.extension import Extension
from urllib.request import Request, urlopen
import zipfile
from io import BytesIO

import versioneer

# read the contents of your README file
from pathlib import Path
this_directory = Path(__file__).parent
long_description = (this_directory / "README.md").read_text()

ZITI_SDK_BASE = 'https://github.com/openziti/ziti-sdk-c/releases/download'


class GetZitilib(build_ext):

    def build_extension(self, ext) -> None:
        ziti_ver = self.get_sdk_version()
        osname, arch, libname = self.get_platform()
        sdk_distro = self.download_sdk(ziti_ver, osname, arch)
        self.extract_zitilib(sdk_distro, libname, self.build_lib)

    def get_platform(self):
        osname = platform.system()
        mach = platform.machine()
        arch, _ = platform.architecture()

        if osname == 'Linux':
            if mach.startswith('arm'):
                if arch == '32bit':
                    mach = 'arm'
                elif arch == '64bit':
                    mach = 'arm64'
            elif mach == 'aarch64':
                mach = 'arm64'
            return osname, mach, 'libziti.so'

        if osname == 'Darwin':
            return osname, mach, 'libziti.dylib'

        if osname == 'Windows':
            return osname, mach, 'ziti.dll'

    def get_sdk_version(self):
        opts = self.distribution.get_option_dict('openziti')
        _, ver = opts['ziti_sdk_version']
        return ver

    def extract_zitilib(self, distro, libname, target):
        with zipfile.ZipFile(BytesIO(distro)) as zipf:
            return zipf.extract(member=f'lib/{libname}', path=f'{target}/openziti')

    def download_sdk(self, version, osname, arch):
        filename = f'{ZITI_SDK_BASE}/{version}/ziti-sdk-{version}-{osname}-{arch}.zip'
        headers = {}
        req = Request(url=filename, headers=headers)
        with urlopen(req) as response:
            length = response.getheader('content-length')
            if response.status != 200:
                raise Exception(f'Could not download "{filename}"')
            print(f"Downloading {length} from {filename}")
            return response.read()

class ZitilibExt(Extension):
    def __init__(self, name, sourcedir=''):
        Extension.__init__(self, name, sources=[])


cmds = dict(build_ext=GetZitilib)
cmds = versioneer.get_cmdclass(cmds)

setup(
    version=versioneer.get_version(),
    cmdclass=cmds,
    ext_modules=[
        ZitilibExt('_get_ziti_lib'),
    ],

    packages=['openziti'],
)