Not workign attempt to use bazel as a monorepo

See also https://github.com/aspect-build/rules_py as a possibly alternative that works with importlib. Although testing against built wheels would still be ideal.

Author: aabmass

.gitignore

@@ -69,3 +69,16 @@ scripts/semconv/semantic-conventions
 
 # Benchmark result files
 *-benchmark.json
+# gitignore template for Bazel build system
+# website: https://bazel.build/
+
+# Ignore all bazel-* symlinks. There is no full list since this can change
+# based on the name of the directory bazel is cloned into.
+/bazel-*
+
+# Directories for the Bazel IntelliJ plugin containing the generated
+# IntelliJ project files and plugin configuration. Seperate directories are
+# for the IntelliJ, Android Studio and CLion versions of the plugin.
+/.ijwb/
+/.aswb/
+/.clwb/

BUILD

@@ -0,0 +1,11 @@
+# See https://rules-python.readthedocs.io/en/latest/getting-started.html
+
+bazel_dep(name = "rules_python", version = "1.0.0")
+
+pip = use_extension("@rules_python//python/extensions:pip.bzl", "pip")
+pip.parse(
+    hub_name = "api_deps",
+    python_version = "3.11",
+    requirements_lock = "//opentelemetry-api:requirements.lock.txt",
+)
+use_repo(pip, "api_deps")

MODULE.bazel

@@ -0,0 +1,52 @@
+load("@api_deps//:requirements.bzl", "requirement")
+load("@rules_python//python:packaging.bzl", "py_package", "py_wheel")
+load("@rules_python//python:py_binary.bzl", "py_binary")
+load("@rules_python//python:py_import.bzl", "py_import")
+load("@rules_python//python:py_library.bzl", "py_library")
+load("@rules_python//python:py_test.bzl", "py_test")
+load("//tools:pytest_test.bzl", "pytest_test")
+
+py_library(
+    name = "api",
+    srcs = glob(["src/**/*.py"]),
+    imports = ["src/"],
+    deps = [
+        requirement("Deprecated"),
+        requirement("importlib-metadata"),
+    ],
+)
+
+py_package(
+    name = "opentelemetry_api_pkg",
+    packages = ["opentelemetry"],
+    deps = [":api"],
+)
+
+py_wheel(
+    name = "opentelemetry_api_wheel",
+    # Package data. We're building "example_minimal_package-0.0.1-py3-none-any.whl"
+    distribution = "opentelemetry-api",
+    python_tag = "py3",
+    strip_path_prefixes = ["opentelemetry-api/src"],
+    version = "0.0.1",
+    deps = [":opentelemetry_api_pkg"],
+)
+
+# This doesn't work, can I use whl_library?
+py_import(
+    name = "opentelemetry_api_wheel_lib",
+    srcs = [":opentelemetry_api_wheel.dist"],
+    deps = [],
+)
+
+py_binary(
+    name = "foo",
+    srcs = ["foo.py"],
+    deps = [":opentelemetry_api_wheel_lib"],
+)
+
+pytest_test(
+    name = "api_test",
+    srcs = glob(["tests/**/*.py"]),
+    deps = [":opentelemetry_api_wheel_lib"],
+)

MODULE.bazel.lock

@@ -0,0 +1,5 @@
+import code
+
+print("hello foo")
+
+code.interact(local=locals())

opentelemetry-api/BUILD

@@ -0,0 +1,36 @@
+# This file was autogenerated by uv via the following command:
+#    uv pip compile test-requirements.txt -o requirements.lock.txt
+asgiref==3.7.2
+    # via -r test-requirements.txt
+deprecated==1.2.14
+    # via -r test-requirements.txt
+importlib-metadata==8.5.0
+    # via -r test-requirements.txt
+iniconfig==2.0.0
+    # via
+    #   -r test-requirements.txt
+    #   pytest
+packaging==24.0
+    # via
+    #   -r test-requirements.txt
+    #   pytest
+pluggy==1.5.0
+    # via
+    #   -r test-requirements.txt
+    #   pytest
+py-cpuinfo==9.0.0
+    # via -r test-requirements.txt
+pytest==7.4.4
+    # via -r test-requirements.txt
+tomli==2.0.1
+    # via -r test-requirements.txt
+typing-extensions==4.10.0
+    # via -r test-requirements.txt
+wrapt==1.16.0
+    # via
+    #   -r test-requirements.txt
+    #   deprecated
+zipp==3.20.2
+    # via
+    #   -r test-requirements.txt
+    #   importlib-metadata

opentelemetry-api/foo.py

@@ -10,7 +10,3 @@ tomli==2.0.1
 typing_extensions==4.10.0
 wrapt==1.16.0
 zipp==3.20.2
--e opentelemetry-sdk
--e opentelemetry-semantic-conventions
--e tests/opentelemetry-test-utils
--e opentelemetry-api

opentelemetry-api/requirements.lock.txt

@@ -0,0 +1,13 @@
+load("@api_deps//:requirements.bzl", "requirement")
+load("@rules_python//python/entry_points:py_console_script_binary.bzl", "py_console_script_binary")
+
+# This lets you run pytest
+py_console_script_binary(
+    name = "pytest",
+    pkg = requirement("pytest"),
+    visibility = ["//visibility:public"],
+)
+
+# exports_files([
+#     "rules_python_entry_point_pytest.py",
+# ])

opentelemetry-api/test-requirements.txt

@@ -0,0 +1,27 @@
+load("@api_deps//:requirements.bzl", "requirement")
+load("@rules_python//python:defs.bzl", "py_test")
+load("@rules_python//python/entry_points:py_console_script_binary.bzl", "py_console_script_binary")
+
+# This is cute, but it creates additinoal py_console_script_binary's genrule invocations for
+# each of the macro. It would be better to cache the script that gets generated.
+#
+# Run `bazel query --output=build //opentelemetry-api:api_test` and notice that there is a
+# one-off main script created for pytest
+# "//opentelemetry-api:rules_python_entry_point_pytest.py".
+def pytest_test(*, name, srcs = [], deps = [], main = None, **test_kwargs):
+    """TODO"""
+
+    if main != None:
+        fail("Do not pass main to pytest_test, instead use py_test directly if you need main.")
+
+    test_srcs = srcs
+    test_deps = deps
+
+    def py_test_wrapper(*, srcs, main, deps, **_):
+        py_test(name = name, srcs = test_srcs + srcs, main = main, deps = test_deps + deps, **test_kwargs)
+
+    py_console_script_binary(
+        name = "pytest",
+        binary_rule = py_test_wrapper,
+        pkg = requirement("pytest"),
+    )