Added Coverage Reports to CI (#1494)

Signed-off-by: Katherine Hough <kmhough@amazon.com>

.github/actions/create_coverage_comment/action.yml

@@ -0,0 +1,95 @@
+name: "Create Coverage PR Comment"
+description: >
+  Build a markdown comment to be posted to a PR by the "comment_pr" workflow.
+  If threshold is set, fails the build if the reported coverage does not meet
+  met expected criteria.
+  Uploads the created markdown comment and the number of the PR that triggered this action as workflow artifacts.
+inputs:
+  threshold:
+    description: >
+      Minimum proportion of modified lines that need to be covered for acceptance or -1 if there is no minimum.
+    required: false
+    default: "-1"
+  report-artifact-prefix:
+    description: "Prefix of the name of the artifact to be downloaded"
+    required: false
+    default: "coverage_report"
+  comment-artifact-name:
+    description: "Name of the artifact to be uploaded"
+    required: false
+    default: "coverage_comment"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Download report artifacts
+      uses: actions/download-artifact@v4
+      with:
+        name: ${{ inputs.report-artifact-prefix }}_cobertura
+    - name: Compute changed lines
+      id: changed_lines
+      uses: hestonhoffman/changed-lines@v1
+      with:
+        file_filter: ".rs"
+    - name: Set up python
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3.13
+    - name: Find last nightly run for BASE
+      shell: bash
+      run: |
+        gh run list \
+          --commit $BASE_SHA \
+          --status "success" \
+          --workflow  "Nightly Build" \
+          --limit 1 \
+          --json "databaseId" \
+          | jq --raw-output '.[0]["databaseId"]' \
+          > base_run_id.txt
+        echo "BASE_RUN_ID=$(cat base_run_id.txt)" >> $GITHUB_ENV
+      env:
+        BASE_SHA: ${{ github.event.pull_request.base.sha }}
+        GH_TOKEN: ${{ github.token }}
+    - name: Find coverage report for BASE
+      if: ${{ env.BASE_RUN_ID != 'null' }}
+      shell: bash
+      run: |
+        mkdir -p base_coverage
+        gh run download $BASE_RUN_ID --name $NAME --dir base_coverage || true
+      env:
+        NAME: ${{ inputs.report-artifact-prefix }}_cobertura
+        GH_TOKEN: ${{ github.token }}
+    - name: Create result files
+      shell: bash
+      run: |
+        mkdir -p target/coverage/results
+        echo $ISSUE_NUMBER > target/coverage/results/issue_number.txt
+        echo $CHANGED_LINES > target/coverage/results/changed_lines.json
+        python .github/scripts/process_coverage.py \
+          cobertura.xml \
+          target/coverage/results/changed_lines.json \
+          $THRESHOLD \
+          $HEAD_SHA \
+          $BASE_SHA \
+          $(cat report_location.txt) \
+          base_coverage/cobertura.xml \
+          target/coverage/results
+        echo "STATUS=$(cat target/coverage/results/status.txt)" >> $GITHUB_ENV
+      env:
+        CHANGED_LINES: ${{ steps.changed_lines.outputs.changed_lines }}
+        THRESHOLD: ${{ inputs.threshold }}
+        ISSUE_NUMBER: ${{ github.event.number }}
+        HEAD_SHA: ${{ github.event.pull_request.head.sha }}
+        BASE_SHA: ${{ github.event.pull_request.base.sha }}
+    - name: Upload results
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ inputs.comment-artifact-name }}
+        path: target/coverage/results/
+        retention-days: 1
+    - name: Check status
+      if: ${{ env.STATUS == 'FAILED' }}
+      uses: actions/github-script@v3
+      with:
+        script: |
+          core.setFailed('Required coverage criteria were not met.')

.github/actions/create_coverage_reports/action.yml

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+name: "Create Coverage Reports"
+description: >
+  Searches the directory tree rooted at the current working directory for raw coverage profiles
+  ('.profraw' files).
+  Builds grcov HTML and cobertura XML coverage reports from the located profiles.
+  Uploads the built reports as workflow artifacts.
+inputs:
+  retention-days:
+    description: >
+      Duration after which the uploaded artifacts will expire in days, or 0 to use the default setting for the 
+      repository.
+    required: false
+    default: "0"
+  artifact-prefix:
+    description: "Prefix of the name for the artifacts to be uploaded"
+    required: false
+    default: "coverage_report"
+
+runs:
+  using: "composite"
+  steps:
+    - name: Install LLVM tools
+      shell: bash
+      run: rustup component add llvm-tools-preview
+    - name: Install grcov
+      shell: bash
+      run: cargo install grcov
+    - name: Collect coverage profiles
+      shell: bash
+      run: zip -0 raw_cov.zip $(find . -name "*.profraw") -q
+    # Note: source-based branch coverage is not supported for Rust
+    # (see http://github.com/rust-lang/rust/issues/79649)
+    - name: Build coverage report
+      shell: bash
+      run: |
+        mkdir -p ./target/coverage
+        grcov raw_cov.zip \
+            --source-dir . \
+            --binary-path ./target/debug/ \
+            -t html,cobertura \
+            --ignore 'target/debug/*' \
+            --ignore '/*' \
+            --ignore '*/build.rs' \
+            --ignore '*/tests/*' \
+            --excl-start '^\#\[cfg\(test\)\]' \
+            --excl-stop '^}' \
+            --ignore-not-existing \
+            -o ./target/coverage/
+    - name: Upload HTML coverage report
+      uses: actions/upload-artifact@v4
+      id: upload-artifact
+      with:
+        name: ${{ inputs.artifact-prefix }}_html
+        path: target/coverage/html
+        retention-days: ${{ inputs.retention-days }}
+    - name: Create directory for cobertura report
+      shell: bash
+      run: |
+        mkdir -p target/coverage/cobertura
+        mv target/coverage/cobertura.xml target/coverage/cobertura/
+        echo $REPORT_LOCATION > target/coverage/cobertura/report_location.txt
+      env:
+        REPORT_LOCATION: ${{ steps.upload-artifact.outputs.artifact-url }}
+    - name: Upload cobertura coverage report
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ inputs.artifact-prefix }}_cobertura
+        path: target/coverage/cobertura
+        retention-days: ${{ inputs.retention-days }}