feat: Initial draft of GAPIC Bazel Extensions gapic-generator-python (#…

…342)

Initial draft of GAPIC Bazel Extensions gapic-generator-python

BUILD.bazel

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+load("@gapic_generator_python_pip_deps//:requirements.bzl", "requirement")
+
+py_binary(
+    name = "gapic_plugin",
+    srcs = glob(["gapic/**/*.py"]),
+    data = glob(["gapic/**/*.j2"]),
+    main = "gapic/cli/generate.py",
+    visibility = ["//visibility:public"],
+    deps = [
+        "@com_google_protobuf//:protobuf_python",
+        requirement("click"),
+        requirement("google-api-core"),
+        requirement("googleapis-common-protos"),
+        requirement("grpcio"),
+        requirement("jinja2"),
+        requirement("pypandoc"),
+        requirement("PyYAML"),
+    ],
+    python_version = "PY3",
+)

WORKSPACE

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+workspace(name = "gapic_generator_python")
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+#
+# Import rules_python
+#
+http_archive(
+    name = "rules_python",
+    strip_prefix = "rules_python-748aa53d7701e71101dfd15d800e100f6ff8e5d1",
+    url = "https://github.com/bazelbuild/rules_python/archive/748aa53d7701e71101dfd15d800e100f6ff8e5d1.zip",
+)
+
+load("@rules_python//python:repositories.bzl", "py_repositories")
+
+py_repositories()
+
+load("@rules_python//python:pip.bzl", "pip_repositories")
+
+pip_repositories()
+
+#
+# Import gapic-generator-python specific dependencies
+#
+load("//:repositories.bzl", "gapic_generator_python")
+
+gapic_generator_python()
+
+load("@gapic_generator_python_pip_deps//:requirements.bzl", "pip_install")
+
+pip_install()
+
+load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
+
+protobuf_deps()

repositories.bzl

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+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+load("@rules_python//python:pip.bzl", "pip_import")
+
+def gapic_generator_python():
+    _maybe(
+        pip_import,
+        name = "gapic_generator_python_pip_deps",
+        python_interpreter = "python3",
+        requirements = "@gapic_generator_python//:requirements.txt",
+    )
+
+    _protobuf_version = "3.11.2"
+    _protobuf_version_in_link = "v%s" % _protobuf_version
+    _maybe(
+        http_archive,
+        name = "com_google_protobuf",
+        urls = ["https://github.com/protocolbuffers/protobuf/archive/%s.zip" % _protobuf_version_in_link],
+        strip_prefix = "protobuf-%s" % _protobuf_version,
+    )
+
+    _maybe(
+        http_archive,
+        name = "bazel_skylib",
+        strip_prefix = "bazel-skylib-2169ae1c374aab4a09aa90e65efe1a3aad4e279b",
+        urls = ["https://github.com/bazelbuild/bazel-skylib/archive/2169ae1c374aab4a09aa90e65efe1a3aad4e279b.tar.gz"],
+    )
+
+    _maybe(
+        http_archive,
+        name = "com_google_api_codegen",
+        strip_prefix = "gapic-generator-b32c73219d617f90de70bfa6ff0ea0b0dd638dfe",
+        urls = ["https://github.com/googleapis/gapic-generator/archive/b32c73219d617f90de70bfa6ff0ea0b0dd638dfe.zip"],
+    )
+
+def _maybe(repo_rule, name, strip_repo_prefix = "", **kwargs):
+    if not name.startswith(strip_repo_prefix):
+        return
+    repo_name = name[len(strip_repo_prefix):]
+    if repo_name in native.existing_rules():
+        return
+    repo_rule(name = repo_name, **kwargs)

requirements.txt

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+click >= 6.7
+google-api-core >= 1.14.3
+googleapis-common-protos >= 1.6.0
+grpcio >= 1.24.3
+jinja2 >= 2.10
+protobuf >= 3.7.1
+pypandoc >= 1.4
+PyYAML >= 5.1.1

rules_python_gapic/py_gapic.bzl

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+# Copyright 2020 Google LLC
+#
+# 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.
+
+load("@com_google_api_codegen//rules_gapic:gapic.bzl", "proto_custom_library")
+
+def py_gapic_library(name, srcs, **kwargs):
+    #    srcjar_target_name = "%s_srcjar" % name
+    srcjar_target_name = name
+    srcjar_output_suffix = ".srcjar"
+
+    proto_custom_library(
+        name = srcjar_target_name,
+        deps = srcs,
+        plugin = Label("@gapic_generator_python//:gapic_plugin"),
+        plugin_args = [],
+        plugin_file_args = {},
+        output_type = "python_gapic",
+        output_suffix = srcjar_output_suffix,
+        **kwargs
+    )