build.sh

#!/bin/bash
# Build Lambda deployment packages
# Creates: lambda_code.zip (handler) and lambda_layer.zip (dependencies)

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

echo "Building Lambda packages..."

# Clean previous builds
rm -rf build/ layer/
rm -f lambda_code.zip lambda_layer.zip lambda_package.zip

# === Build code package (just the handler) ===
echo "Creating code package..."
mkdir -p build/
cp src/redshift_to_postgres_sync.py build/
cd build/
zip -r ../lambda_code.zip . -q
cd ..
rm -rf build/

# === Build layer package (dependencies) ===
echo "Creating layer package..."
mkdir -p layer/python

# Use pip with platform targeting for Lambda (Amazon Linux 2023 / x86_64)
pip3 install \
  --platform manylinux2014_x86_64 \
  --implementation cp \
  --python-version 3.12 \
  --only-binary=:all: \
  --target layer/python \
  psycopg2-binary redshift-connector boto3 \
  --quiet 2>/dev/null || {
    echo "Platform-specific install failed, trying regular install..."
    pip3 install psycopg2-binary redshift-connector boto3 -t layer/python --quiet
  }

cd layer/
zip -r ../lambda_layer.zip . -q
cd ..
rm -rf layer/

echo ""
echo "✓ Build complete!"
echo "  lambda_code.zip:  $(du -h lambda_code.zip | cut -f1) (handler only)"
echo "  lambda_layer.zip: $(du -h lambda_layer.zip | cut -f1) (dependencies)"
echo ""
echo "Next steps:"
echo "  terraform apply"