serverless-binary-size.yml

name: "Serverless Binary Size"

on:
  pull_request:

env:
  SIZE_ALLOWANCE: fromJSON(1000000) # 1 MB

permissions: {}

jobs:
  comment:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write # Add comment to PR
    steps:
      - name: Checkout datadog-agent repository
        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
        with:
          path: go/src/github.com/DataDog/datadog-agent

      - name: Checkout datadog-agent base branch
        run: |
          # on pull request, use the merge-base
          # on merge queue, just use the latest main
          if [ -n "$GITHUB_HEAD_REF" ]; then
            cd go/src/github.com/DataDog/datadog-agent
            git fetch origin $GITHUB_HEAD_REF $GITHUB_BASE_REF
            TARGET=$(git merge-base origin/$GITHUB_HEAD_REF origin/$GITHUB_BASE_REF)
            git checkout $TARGET
          fi

      - name: Checkout the datadog-lambda-extension repository
        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
        with:
          repository: DataDog/datadog-lambda-extension
          path: go/src/github.com/DataDog/datadog-lambda-extension

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@988b5a0280414f521da01fcc63a27aeeb4b104db # v3.6.1

      - name: Previous binary size and dependencies
        id: previous
        run: |
          cd go/src/github.com/DataDog/datadog-lambda-extension

          OUTPUT=$(./scripts/visualize_size.sh size)
          echo "binary size before merging this pull request is $OUTPUT"
          echo "result=$OUTPUT" >> $GITHUB_OUTPUT

          echo "deps<<EOF" >> $GITHUB_OUTPUT
          ./scripts/visualize_size.sh list_symbols | awk '{print $2}' | head -n 100 >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Checkout datadog-agent pr branch
        run: |
          cd go/src/github.com/DataDog/datadog-agent
          git fetch origin $GITHUB_SHA --depth 1
          git checkout $GITHUB_SHA

      - name: Current binary size and dependencies
        id: current
        run: |
          cd go/src/github.com/DataDog/datadog-lambda-extension

          OUTPUT=$(./scripts/visualize_size.sh size)
          echo "binary size after merging this pull request will be $OUTPUT"
          echo "result=$OUTPUT" >> $GITHUB_OUTPUT

          echo "deps<<EOF" >> $GITHUB_OUTPUT
          ./scripts/visualize_size.sh list_symbols | awk '{print $2}' | head -n 100 >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Compare sizes
        id: compare
        run: |
          OUTPUT=$(( ${{ steps.current.outputs.result }} - ${{ steps.previous.outputs.result }} ))
          echo "binary size changed by $OUTPUT bytes"
          echo "diff=$OUTPUT" >> $GITHUB_OUTPUT

          OUTPUT=$(( $OUTPUT / 100000 ))
          echo "cold start time changed by $OUTPUT ms"
          echo "coldstart=$OUTPUT" >> $GITHUB_OUTPUT

      - name: Should post comment
        id: should
        run: |
          cd go/src/github.com/DataDog/datadog-agent
          git fetch origin $GITHUB_BASE_REF
          git fetch origin $GITHUB_HEAD_REF
          if test $(
            git diff origin/$GITHUB_BASE_REF...origin/$GITHUB_HEAD_REF --name-only | grep dependencies_linux_amd64.txt
          ); then
            echo "should_run=true" >> $GITHUB_OUTPUT
            echo "dependencies list changed"
          elif [[ ${{ steps.compare.outputs.diff }} > env.SIZE_ALLOWANCE ]]; then
            echo "should_run=true" >> $GITHUB_OUTPUT
            echo "binary size changed"
          else
            echo "should_run=false" >> $GITHUB_OUTPUT
            echo "nothing changed"
          fi

      ### Steps below run if size diff > SIZE_ALLOWANCE or file dependencies_linux_amd64.txt changed ###

      - name: Install graphviz
        uses: ts-graphviz/setup-graphviz@b1de5da23ed0a6d14e0aeee8ed52fdd87af2363c # v2.0.2
        if: steps.should.outputs.should_run == 'true'

      - name: Install digraph
        if: steps.should.outputs.should_run == 'true'
        run: |
          GOPATH=$(pwd)/go go install golang.org/x/tools/cmd/digraph@latest

      - name: List new dependencies
        id: deps
        if: steps.should.outputs.should_run == 'true'
        run: |
          echo "deps<<EOF" >> $GITHUB_OUTPUT
          for dep in $(echo "${{ steps.current.outputs.deps }}"); do
            if ! echo "${{ steps.previous.outputs.deps }}" | grep -w -q "$dep"; then
              echo "$dep" >> $GITHUB_OUTPUT
            fi
          done
          echo "EOF" >> $GITHUB_OUTPUT

      - name: Create dependency graphs
        if: steps.should.outputs.should_run == 'true'
        run: |
          export PATH=$(pwd)/go/bin:$PATH
          cd go/src/github.com/DataDog/datadog-lambda-extension
          mkdir graphs
          for dep in $(echo "${{ steps.deps.outputs.deps }}"); do
            PACKAGE=$dep ./scripts/visualize_size.sh graph
            mv .layers/output.svg graphs/$(echo $dep | tr '/' '-').svg
          done

      - name: Archive dependency graphs
        uses: actions/upload-artifact@834a144ee995460fba8ed112a2fc961b36a5ec5a # v4.3.6
        if: steps.should.outputs.should_run == 'true'
        with:
          name: dependency-graphs
          path: go/src/github.com/DataDog/datadog-lambda-extension/graphs

      - name: Write message
        id: write
        if: steps.should.outputs.should_run == 'true'
        env:
          VAR_COLD_START: ${{ steps.compare.outputs.coldstart }}
          VAR_DIFF: ${{ steps.compare.outputs.diff }}
          VAR_DEPS: ${{ steps.deps.outputs.deps }}
          VAR_RUN_ID: ${{ github.run_id }}
        run: |
          cd go/src/github.com/DataDog/datadog-agent
          ./test/integration/serverless_perf/write_message.sh

      - name: Post comment
        uses: marocchino/sticky-pull-request-comment@331f8f5b4215f0445d3c07b4967662a32a2d3e31 # v2.9.0
        if: steps.should.outputs.should_run == 'true'
        with:
          header: serverless-binary-size
          recreate: true
          path: ${{ steps.write.outputs.filename }}