Create flagd-evaluator WebAssembly library for JSON Logic evaluation

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-test-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-test-
+
+      - name: Run tests
+        run: cargo test --verbose
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-clippy-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-clippy-
+
+      - name: Run Clippy
+        run: cargo clippy -- -D warnings
+
+  fmt:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt
+
+      - name: Check formatting
+        run: cargo fmt -- --check
+
+  build-wasm:
+    name: Build WASM
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-wasm-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-wasm-
+
+      - name: Build WASM
+        run: cargo build --target wasm32-unknown-unknown --release
+
+      - name: Upload WASM artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: flagd_evaluator.wasm
+          path: target/wasm32-unknown-unknown/release/flagd_evaluator.wasm
+          retention-days: 30
+
+  validate-size:
+    name: Validate WASM Size
+    needs: build-wasm
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download WASM artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: flagd_evaluator.wasm
+
+      - name: Check WASM size
+        run: |
+          SIZE=$(stat -c%s flagd_evaluator.wasm)
+          echo "WASM file size: $SIZE bytes ($(echo "scale=2; $SIZE / 1024" | bc) KB)"
+          MAX_SIZE=$((2000 * 1024))  # 2MB in bytes (includes full JSON Logic implementation)
+          if [ $SIZE -gt $MAX_SIZE ]; then
+            echo "Error: WASM file size ($SIZE bytes) exceeds maximum allowed size ($MAX_SIZE bytes)"
+            exit 1
+          fi
+          echo "WASM file size is within limits"

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*.*.*'
+
+env:
+  CARGO_TERM_COLOR: always
+
+permissions:
+  contents: write
+
+jobs:
+  build-release:
+    name: Build Release
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: wasm32-unknown-unknown
+
+      - name: Cache cargo
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: ${{ runner.os }}-cargo-release-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-cargo-release-
+
+      - name: Build WASM
+        run: cargo build --target wasm32-unknown-unknown --release
+
+      - name: Install wasm-opt
+        run: |
+          curl -L https://github.com/WebAssembly/binaryen/releases/download/version_118/binaryen-version_118-x86_64-linux.tar.gz | tar xz -C /tmp
+          echo "/tmp/binaryen-version_118/bin" >> $GITHUB_PATH
+
+      - name: Optimize WASM
+        run: |
+          wasm-opt -Oz --enable-bulk-memory --enable-nontrapping-float-to-int \
+            -o target/wasm32-unknown-unknown/release/flagd_evaluator.optimized.wasm \
+            target/wasm32-unknown-unknown/release/flagd_evaluator.wasm
+          mv target/wasm32-unknown-unknown/release/flagd_evaluator.optimized.wasm \
+            target/wasm32-unknown-unknown/release/flagd_evaluator.wasm
+          echo "WASM optimized with wasm-opt"
+
+      - name: Generate checksums
+        run: |
+          cd target/wasm32-unknown-unknown/release
+          sha256sum flagd_evaluator.wasm > flagd_evaluator.wasm.sha256
+          echo "SHA256 checksum:"
+          cat flagd_evaluator.wasm.sha256
+
+      - name: Get WASM size
+        run: |
+          SIZE=$(stat -c%s target/wasm32-unknown-unknown/release/flagd_evaluator.wasm)
+          echo "WASM file size: $SIZE bytes ($(echo "scale=2; $SIZE / 1024" | bc) KB)"
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            target/wasm32-unknown-unknown/release/flagd_evaluator.wasm
+            target/wasm32-unknown-unknown/release/flagd_evaluator.wasm.sha256
+          generate_release_notes: true
+          fail_on_unmatched_files: true
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

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+# Generated files
+/target/
+/dist/
+
+# Cargo lock file (library)
+Cargo.lock
+
+# IDE and editor files
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+.DS_Store
+
+# Build artifacts
+*.wasm
+!examples/**/*.wasm
+
+# Backup files
+*.bak
+*.orig
+
+# Test coverage
+*.profraw
+*.profdata
+coverage/
+tarpaulin-report.html
+
+# Local environment
+.env
+.env.local
+
+# Temporary files
+*.tmp
+*.temp
+tmp/
+temp/
+
+# Documentation build
+/target/doc/
+
+# OS generated files
+Thumbs.db
+ehthumbs.db
+Desktop.ini