Publish common library as Maven artifact on release.

.github/workflows/publish-maven-artifacts.yml

@@ -0,0 +1,99 @@
+# Copyright 2024 The Cross-Media Measurement Authors
+#
+# 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
+#
+#     http://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.
+
+on:
+  release:
+  workflow_dispatch:
+    inputs:
+      base-version:
+        description: Base artifact version, which will be suffixed with "-SNAPSHOT"
+        required: true
+  pull_request:
+    types: [opened, synchronize, edited]
+
+jobs:
+  publish-artifacts:
+    name: Publish Maven artifacts
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+
+      - id: get-artifact-version
+        env:
+          BASE_VERSION: 0.86.0-SNAPSHOT
+        run: |
+          declare artifact_version
+          if [[ "$GITHUB_EVENT_NAME" == 'release' ]]; then
+            artifact_version="${GITHUB_REF_NAME#v}"
+          else
+            artifact_version="${BASE_VERSION}-SNAPSHOT"
+          fi
+          
+          echo "artifact-version=${artifact_version}" >> "$GITHUB_OUTPUT"
+
+      - name: Set up Bazel
+        run: |
+          mkdir -p ~/.local/bin
+          bazelisk_path="$(which bazelisk)"
+          ln -s "${bazelisk_path}" ~/.local/bin/bazel
+
+      - name: Set up Buildozer
+        run: |
+          cd ~/.local/bin
+          curl -L -o buildozer https://github.com/bazelbuild/buildtools/releases/download/v7.1.2/buildozer-linux-amd64
+          echo '8d5c459ab21b411b8be059a8bdf59f0d3eabf9dff943d5eccb80e36e525cc09d  buildozer' > buildozer.sha256
+          sha256sum --check buildozer.sha256
+          chmod +x buildozer
+
+      - name: Write ~/.bazelrc
+        run: |
+          echo 'common --config=ci' >> ~/.bazelrc
+
+      - name: Get Bazel cache params
+        id: get-cache-params
+        uses: world-federation-of-advertisers/actions/bazel-get-cache-params@v2
+        with:
+          cache-version: 1
+
+      - name: Restore Bazel cache
+        uses: actions/cache/restore@v3
+        with:
+          path: ${{ steps.get-cache-params.outputs.cache-path }}
+          key: ${{ steps.get-cache-params.outputs.cache-key }}
+          restore-keys: |-
+            ${{ steps.get-cache-params.outputs.restore-key }}
+
+      # Patch MODULE.bazel and MODULE.bazel.lock to specify version.
+      # TODO(bazelbuild/bazel#22919): Use alternative mechanism when available.
+      - name: Patch module version
+        env:
+          ARTIFACT_VERSION: ${{ steps.get-artifact-version.outputs.artifact-version }}
+        run: |
+          # Make sure lockfile is still valid before changing anything.
+          bazel mod deps --lockfile_mode=error
+
+          # Update MODULE.bazel.
+          buildozer "set version $ARTIFACT_VERSION" //MODULE.bazel:%module
+          
+          # Update lockfile to pick up changes.
+          bazel mod deps --lockfile_mode=update
+
+      - name: Publish artifacts
+        env:
+          MAVEN_REPO: https://maven.pkg.github.com/${{ github.repository }}
+          # TODO(bazelbuild/rules_jvm_external#1186): Use GITHUB_TOKEN instead.
+          MAVEN_USER: ${{ vars.MAVEN_USER }}
+          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
+        run: |
+          bazel query "kind('^maven_publish', //src/main/...)" | xargs bazel run

build/maven/defs.bzl

@@ -0,0 +1,20 @@
+# Copyright 2024 The Cross-Media Measurement Authors
+#
+# 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
+#
+#     http://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.
+
+"""Defs for exporting to Maven."""
+
+# buildifier: disable=unnamed-macro
+def artifact_version():
+    """Returns the artifact version for libraries defined in this module."""
+    return native.module_version() or "0.0.0-SNAPSHOT"

src/main/kotlin/org/wfanet/measurement/common/BUILD.bazel

@@ -1,10 +1,15 @@
+load("@rules_jvm_external//:defs.bzl", "maven_export")
 load("@wfa_rules_kotlin_jvm//kotlin:defs.bzl", "kt_jvm_library")
+load("//build/maven:defs.bzl", "artifact_version")
 
 package(default_visibility = ["//visibility:public"])
 
+MAVEN_COORDINATES = "org.wfanet.measurement:common:" + artifact_version()
+
 kt_jvm_library(
     name = "common",
     srcs = glob(["*.kt"]),
+    tags = ["maven_coordinates=" + MAVEN_COORDINATES],
     deps = [
         "//imports/java/com/github/benmanes/caffeine",
         "//imports/java/com/google/common:guava",
@@ -19,3 +24,11 @@ kt_jvm_library(
         "//imports/kotlin/kotlinx/coroutines:core",
     ],
 )
+
+maven_export(
+    name = "common_maven",
+    lib_name = "common",
+    maven_coordinates = MAVEN_COORDINATES,
+    tags = ["no-javadocs"],
+    visibility = ["//visibility:private"],
+)