metrics-integration-tests.yml

name: Metrics Exporter Integration Tests

on:
  pull_request:
  push:
    branches: [main]

jobs:
  metrics-integration-test:
    name: Metrics Exporter Integration Tests
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Rust
        uses: dtolnay/rust-toolchain@stable

      - name: Cache
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target
          key: ${{ runner.os }}-cargo-metrics-${{ hashFiles('**/Cargo.lock') }}

      - name: Build metrics exporter
        run: cargo build --manifest-path metrics/Cargo.toml --release

      - name: Start metrics exporter
        env:
          RUST_LOG: debug
        run: |
          timeout 30 ./metrics/target/release/router-metrics-exporter \
            --listen 0.0.0.0:9090 \
            --rpc-url http://localhost:8000 &
          EXPORTER_PID=$!
          sleep 2
          echo "EXPORTER_PID=$EXPORTER_PID" >> $GITHUB_ENV
        continue-on-error: true

      - name: Validate metrics endpoint
        run: |
          # Check if metrics endpoint is accessible
          RESPONSE=$(curl -s -w "\n%{http_code}" http://localhost:9090/metrics || echo "000")
          HTTP_CODE=$(echo "$RESPONSE" | tail -n1)
          BODY=$(echo "$RESPONSE" | head -n-1)
          
          if [ "$HTTP_CODE" != "200" ]; then
            echo "❌ Metrics endpoint returned HTTP $HTTP_CODE"
            exit 1
          fi
          
          echo "✅ Metrics endpoint is accessible (HTTP 200)"
          
          # Validate Prometheus format
          if echo "$BODY" | grep -q "^# HELP"; then
            echo "✅ Prometheus format detected (HELP lines present)"
          else
            echo "⚠️  No HELP lines found in metrics output"
          fi
          
          if echo "$BODY" | grep -q "^# TYPE"; then
            echo "✅ Prometheus TYPE lines present"
          else
            echo "⚠️  No TYPE lines found in metrics output"
          fi

      - name: Validate expected metrics
        run: |
          METRICS_OUTPUT=$(curl -s http://localhost:9090/metrics)
          
          EXPECTED_METRICS=(
            "router_core_routes_total"
            "router_core_resolutions_total"
            "router_middleware_rate_limit_hits_total"
            "router_registry_entries_total"
          )
          
          MISSING_METRICS=0
          for metric in "${EXPECTED_METRICS[@]}"; do
            if echo "$METRICS_OUTPUT" | grep -q "$metric"; then
              echo "✅ Found metric: $metric"
            else
              echo "⚠️  Missing metric: $metric (expected but not found)"
              MISSING_METRICS=$((MISSING_METRICS + 1))
            fi
          done
          
          if [ $MISSING_METRICS -gt 0 ]; then
            echo ""
            echo "Note: Some expected metrics were not found. This may be expected if contracts are not initialized."
          fi

      - name: Test metrics scrape performance
        run: |
          START_TIME=$(date +%s%N)
          curl -s http://localhost:9090/metrics > /dev/null
          END_TIME=$(date +%s%N)
          
          DURATION_MS=$(( (END_TIME - START_TIME) / 1000000 ))
          echo "Metrics scrape took ${DURATION_MS}ms"
          
          if [ $DURATION_MS -gt 5000 ]; then
            echo "⚠️  Metrics scrape took longer than 5 seconds"
          else
            echo "✅ Metrics scrape performance is acceptable"
          fi

      - name: Cleanup
        if: always()
        run: |
          if [ -n "$EXPORTER_PID" ]; then
            kill $EXPORTER_PID 2>/dev/null || true
          fi