From 025f42f1eacc3b656cedb8465ec2f2574fcc9e51 Mon Sep 17 00:00:00 2001
From: Keith Smiley <keithbsmiley@gmail.com>
Date: Fri, 14 Jun 2024 13:43:37 -0700
Subject: [PATCH] [BUILD] Add support for bzlmod (#2608)

* Add support for bzlmod

This adds support for bzlmod, which is bazel's new dependency resolution
system.

Theoretically we could now remove the previous dependency management
configuration which required flattening all the dependencies, but I left
it here for now for users using old versions of bazel.
---
 .github/workflows/ci.yml | 21 +++++++++++++++++++++
 .gitignore               |  1 +
 MODULE.bazel             | 25 +++++++++++++++++++++++++
 WORKSPACE.bzlmod         |  4 ++++
 ci/do_ci.sh              |  4 ++++
 5 files changed, 55 insertions(+)
 create mode 100644 MODULE.bazel
 create mode 100644 WORKSPACE.bzlmod

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5834ca2fd4..26c692953c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -537,6 +537,27 @@ jobs:
     - name: run tests
       run: ./ci/do_ci.sh bazel.test
 
+  bazel_no_bzlmod_test:
+    name: Bazel without bzlmod
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: 'recursive'
+    - name: Mount Bazel Cache
+      uses: actions/cache@v4
+      env:
+        cache-name: bazel_cache
+      with:
+        path: /home/runner/.cache/bazel
+        key: bazel_test
+    - name: setup
+      run: |
+        sudo ./ci/setup_ci_environment.sh
+        sudo ./ci/install_bazelisk.sh
+    - name: run tests
+      run: ./ci/do_ci.sh bazel.no_bzlmod.test
+
   bazel_test_async:
     name: Bazel with async export
     runs-on: ubuntu-latest
diff --git a/.gitignore b/.gitignore
index dc26aa2f82..cafefd636d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,7 @@
 *.app
 
 # Bazel files
+MODULE.bazel.lock
 /bazel-*
 
 # Mac
diff --git a/MODULE.bazel b/MODULE.bazel
new file mode 100644
index 0000000000..7b84c2b719
--- /dev/null
+++ b/MODULE.bazel
@@ -0,0 +1,25 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+module(
+    name = "opentelemetry-cpp",
+    version = "0",
+    compatibility_level = 0,
+    repo_name = "io_opentelemetry_cpp",
+)
+
+bazel_dep(name = "abseil-cpp", version = "20240116.1", repo_name = "com_google_absl")
+bazel_dep(name = "bazel_skylib", version = "1.5.0")
+bazel_dep(name = "curl", version = "8.4.0")
+bazel_dep(name = "grpc", version = "1.62.1", repo_name = "com_github_grpc_grpc")
+bazel_dep(name = "nlohmann_json", version = "3.11.3", repo_name = "github_nlohmann_json")
+bazel_dep(name = "opentelemetry-proto", version = "1.3.1", repo_name = "com_github_opentelemetry_proto")
+bazel_dep(name = "opentracing-cpp", version = "1.6.0", repo_name = "com_github_opentracing")
+bazel_dep(name = "platforms", version = "0.0.8")
+bazel_dep(name = "prometheus-cpp", version = "1.2.4", repo_name = "com_github_jupp0r_prometheus_cpp")
+bazel_dep(name = "protobuf", version = "26.0", repo_name = "com_google_protobuf")
+bazel_dep(name = "rules_proto", version = "5.3.0-21.7")
+bazel_dep(name = "zlib", version = "1.3.1.bcr.1")
+
+bazel_dep(name = "google_benchmark", version = "1.8.3", dev_dependency = True, repo_name = "com_github_google_benchmark")
+bazel_dep(name = "googletest", version = "1.14.0.bcr.1", dev_dependency = True, repo_name = "com_google_googletest")
diff --git a/WORKSPACE.bzlmod b/WORKSPACE.bzlmod
new file mode 100644
index 0000000000..0db1b04622
--- /dev/null
+++ b/WORKSPACE.bzlmod
@@ -0,0 +1,4 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+# Disables the default WORKSPACE when using bzlmod
diff --git a/ci/do_ci.sh b/ci/do_ci.sh
index 7855ed4175..efdac9e87e 100755
--- a/ci/do_ci.sh
+++ b/ci/do_ci.sh
@@ -459,6 +459,10 @@ EOF
   make load_plugin_example
   examples/plugin/load/load_plugin_example ${PLUGIN_DIR}/libexample_plugin.so /dev/null
   exit 0
+elif [[ "$1" == "bazel.no_bzlmod.test" ]]; then
+  bazel $BAZEL_STARTUP_OPTIONS build --enable_bzlmod=false $BAZEL_OPTIONS //...
+  bazel $BAZEL_STARTUP_OPTIONS test --enable_bzlmod=false $BAZEL_TEST_OPTIONS //...
+  exit 0
 elif [[ "$1" == "bazel.test" ]]; then
   bazel $BAZEL_STARTUP_OPTIONS build $BAZEL_OPTIONS //...
   bazel $BAZEL_STARTUP_OPTIONS test $BAZEL_TEST_OPTIONS //...