Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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101 lines
3.9 KiB
101 lines
3.9 KiB
# Copyright (c) 2009-2021, Google LLC |
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# All rights reserved. |
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# |
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# Redistribution and use in source and binary forms, with or without |
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# modification, are permitted provided that the following conditions are met: |
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# * Redistributions of source code must retain the above copyright |
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# notice, this list of conditions and the following disclaimer. |
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# * Redistributions in binary form must reproduce the above copyright |
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# notice, this list of conditions and the following disclaimer in the |
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# documentation and/or other materials provided with the distribution. |
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# * Neither the name of Google LLC nor the |
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# names of its contributors may be used to endorse or promote products |
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# derived from this software without specific prior written permission. |
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# |
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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# DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY |
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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"""Repository rule for using Python 3.x headers from the system.""" |
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_build_file = """ |
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load("@bazel_tools//tools/python:toolchain.bzl", "py_runtime_pair") |
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cc_library( |
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name = "python_headers", |
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hdrs = glob(["python/**/*.h"]), |
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includes = ["python"], |
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visibility = ["//visibility:public"], |
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) |
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py_runtime( |
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name = "py3_runtime", |
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interpreter_path = "{}", |
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python_version = "PY3", |
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) |
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py_runtime_pair( |
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name = "runtime_pair", |
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py3_runtime = ":py3_runtime", |
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) |
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toolchain( |
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name = "python_toolchain", |
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toolchain = ":runtime_pair", |
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toolchain_type = "@rules_python//python:toolchain_type", |
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) |
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""" |
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def _get_python_version(repository_ctx): |
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py_program = "import sys; print(str(sys.version_info.major) + str(sys.version_info.minor))" |
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result = repository_ctx.execute(["python3", "-c", py_program]) |
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return (result.stdout).strip() |
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def _get_config_var(repository_ctx, name): |
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py_program = "import sysconfig; print(sysconfig.get_config_var('%s'), end='')" |
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result = repository_ctx.execute(["python3", "-c", py_program % (name)]) |
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if result.return_code != 0: |
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return None |
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return result.stdout |
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def _python_headers_impl(repository_ctx): |
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path = _get_config_var(repository_ctx, "INCLUDEPY") |
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if not path: |
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# buildifier: disable=print |
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print("WARNING: no system python available, builds against system python will fail") |
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repository_ctx.file("BUILD.bazel", "") |
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repository_ctx.file("version.bzl", "SYSTEM_PYTHON_VERSION = None") |
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return |
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repository_ctx.symlink(path, "python") |
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python3 = repository_ctx.which("python3") |
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python_version = _get_python_version(repository_ctx) |
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repository_ctx.file("BUILD.bazel", _build_file.format(python3)) |
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repository_ctx.file("version.bzl", "SYSTEM_PYTHON_VERSION = '{}'".format(python_version)) |
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# The system_python() repository rule exposes Python headers from the system. |
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# |
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# In WORKSPACE: |
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# system_python( |
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# name = "system_python_repo", |
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# ) |
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# |
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# This repository exposes a single rule that you can depend on from BUILD: |
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# cc_library( |
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# name = "foobar", |
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# srcs = ["foobar.cc"], |
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# deps = ["@system_python_repo//:python_headers"], |
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# ) |
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# |
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# The headers should correspond to the version of python obtained by running |
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# the `python3` command on the system. |
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system_python = repository_rule( |
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implementation = _python_headers_impl, |
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local = True, |
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)
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