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1#!/bin/sh2# Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.3 4if [ -z "$NODE_PATH" ];5then6  nodejs_mods="/opt/nodejs/node_modules"7  nodejs24_mods="/opt/nodejs/node24/node_modules"8  runtime_mods="/var/runtime/node_modules"9  task="/var/runtime:/var/task"10  export NODE_PATH="$nodejs24_mods:$nodejs_mods:$runtime_mods:$task"11fi12 13if [ -n "$AWS_LAMBDA_FUNCTION_MEMORY_SIZE" ];14then15  # For V8 options, both '_' and '-' are supported16  # Ref: https://github.com/nodejs/node/pull/1409317  semi_space_str_und="--max_semi_space_size"18  old_space_str_und="--max_old_space_size"19 20  semi_space_str=${semi_space_str_und//[_]/-}21  old_space_str=${old_space_str_und//[_]/-}22 23  # Do not override customers' semi and old space size options if they specify them24  # with NODE_OPTIONS env var. If they just set one, use the default value from v825  # for the other.26  case $NODE_OPTIONS in27  *$semi_space_str_und*);;28  *$old_space_str_und*);;29  *$semi_space_str*);;30  *$old_space_str*);;31  *)32    # New space should be 5% of AWS_LAMBDA_FUNCTION_MEMORY_SIZE, leaving 5% available for buffers, for instance,33    # very large images or JSON files, which are allocated as C memory, rather than JavaScript heap in V8.34    new_space=$(($AWS_LAMBDA_FUNCTION_MEMORY_SIZE / 10))35    # The young generation size of the V8 heap is three times the size of the semi-space,36    # an increase of 1 MiB to semi-space applies to each of the three individual semi-spaces37    # and causes the heap size to increase by 3 MiB.38    semi_space=$(($new_space / 6))39    # Old space should be 90% of AWS_LAMBDA_FUNCTION_MEMORY_SIZE40    old_space=$(($AWS_LAMBDA_FUNCTION_MEMORY_SIZE - $new_space))41    MEMORY_ARGS=(42      "$semi_space_str=$semi_space"43      "$old_space_str=$old_space"44    )45    ;;46  esac47fi48 49# If NODE_EXTRA_CA_CERTS is being set by the customer, don't override. Else, include RDS CA50if [ -z "${NODE_EXTRA_CA_CERTS+set}" ]; then51  # Use the default CA bundle in regions that have 3 dashes in their name52  if [ "${AWS_REGION:0:6}" != "us-gov" ] && [ "${AWS_REGION//[^-]}" == "---" ]; then53    export NODE_EXTRA_CA_CERTS=/etc/pki/tls/certs/ca-bundle.crt54  fi55fi56 57export AWS_EXECUTION_ENV=AWS_Lambda_nodejs24.x58 59# Set UV_THREADPOOL_SIZE to 12 x vCPU in multi-concurrency environments if not already set60if [ -n "$AWS_LAMBDA_MAX_CONCURRENCY" ] && [ -z "$UV_THREADPOOL_SIZE" ]; then61  # Detect vCPUs from cgroup v2 CPU quota62  # https://www.kernel.org/doc/html/latest/admin-guide/cgroup-v2.html#cpu63  # cpu.max contains: "<max> <period>" where max is the quota in microseconds64  cpus=165  if [ -f /sys/fs/cgroup/cpu.max ]; then66    read -r max period < /sys/fs/cgroup/cpu.max67    if [ "$max" != "max" ] && [ "$period" -gt 0 ] 2>/dev/null && [ "$max" -gt 0 ] 2>/dev/null; then68      cpus=$(( (max + period - 1) / period ))69    else70      cpus=$(nproc 2>/dev/null || echo 1)71    fi72  fi73  export UV_THREADPOOL_SIZE=$(( 12 * cpus ))74fi75 76# Handle experimental Node.js flags based on customer NODE_OPTIONS77# NODEJS@22 introduced a feature to detect syntax in ambiguous files that end with .js78# The feature is enabled by default on node, we disable it as it is not compatible with79# our RIC due to the differences in import logic. We will be updating the RIC and enabling80# the feature down the road.81# https://nodejs.org/en/blog/release/v22.12.082# Node 22.12.0 introduced support for require(esm) by default83# Disabling it to as it is not compatible with the RIC and to keep the experience backwards compatible84EXPERIMENTAL_ARGS=()85 86# Check if customer has enabled --experimental-detect-module in NODE_OPTIONS87case $NODE_OPTIONS in88*--experimental-detect-module*)89  EXPERIMENTAL_ARGS+=(--experimental-detect-module)90  ;;91*)92  EXPERIMENTAL_ARGS+=(--no-experimental-detect-module)93  ;;94esac95 96# Check if customer has enabled --experimental-require-module in NODE_OPTIONS97case $NODE_OPTIONS in98*--experimental-require-module*)99  EXPERIMENTAL_ARGS+=(--experimental-require-module)100  ;;101*)102  EXPERIMENTAL_ARGS+=(--no-experimental-require-module)103  ;;104esac105 106NODE_ARGS=(107    --expose-gc108    --max-http-header-size 81920109    "${EXPERIMENTAL_ARGS[@]}"110    "${MEMORY_ARGS[@]}"111    /var/runtime/index.mjs112    )113 114if [ -z "$AWS_LAMBDA_EXEC_WRAPPER" ]; then115  exec /var/lang/bin/node "${NODE_ARGS[@]}"116else117  wrapper="$AWS_LAMBDA_EXEC_WRAPPER"118  if [ ! -f "$wrapper" ]; then119    echo "$wrapper: does not exist"120    exit 127121  fi122  if [ ! -x "$wrapper" ]; then123    echo "$wrapper: is not an executable"124    exit 126125  fi126    exec -- "$wrapper" /var/lang/bin/node "${NODE_ARGS[@]}"127fi128