aws-cdk
Version:
AWS CDK CLI, the command line tool for CDK apps
297 lines • 48.1 kB
JavaScript
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isHotswappableLambdaFunctionChange = isHotswappableLambdaFunctionChange;
const stream_1 = require("stream");
const common_1 = require("./common");
const api_1 = require("../../../../@aws-cdk/tmp-toolkit-helpers/src/api");
const util_1 = require("../../util");
const cloudformation_1 = require("../cloudformation");
// namespace object imports won't work in the bundle for function exports
// eslint-disable-next-line @typescript-eslint/no-require-imports
const archiver = require('archiver');
async function isHotswappableLambdaFunctionChange(logicalId, change, evaluateCfnTemplate) {
// if the change is for a Lambda Version, we just ignore it
// we will publish a new version when we get to hotswapping the actual Function this Version points to
// (Versions can't be changed in CloudFormation anyway, they're immutable)
if (change.newValue.Type === 'AWS::Lambda::Version') {
return [];
}
// we handle Aliases specially too
// the actual alias update will happen if we change the function
if (change.newValue.Type === 'AWS::Lambda::Alias') {
return classifyAliasChanges(change);
}
if (change.newValue.Type !== 'AWS::Lambda::Function') {
return [];
}
const ret = [];
const classifiedChanges = (0, common_1.classifyChanges)(change, ['Code', 'Environment', 'Description']);
classifiedChanges.reportNonHotswappablePropertyChanges(ret);
const functionName = await evaluateCfnTemplate.establishResourcePhysicalName(logicalId, change.newValue.Properties?.FunctionName);
const namesOfHotswappableChanges = Object.keys(classifiedChanges.hotswappableProps);
if (functionName && namesOfHotswappableChanges.length > 0) {
const lambdaCodeChange = await evaluateLambdaFunctionProps(classifiedChanges.hotswappableProps, change.newValue.Properties?.Runtime, evaluateCfnTemplate);
// nothing to do here
if (lambdaCodeChange === undefined) {
return ret;
}
const dependencies = await dependantResources(logicalId, functionName, evaluateCfnTemplate);
ret.push({
change: {
cause: change,
resources: [
{
logicalId,
resourceType: change.newValue.Type,
physicalName: functionName,
metadata: evaluateCfnTemplate.metadataFor(logicalId),
},
...dependencies,
],
},
hotswappable: true,
service: 'lambda',
apply: async (sdk) => {
const lambda = sdk.lambda();
const operations = [];
if (lambdaCodeChange.code !== undefined || lambdaCodeChange.configurations !== undefined) {
if (lambdaCodeChange.code !== undefined) {
const updateFunctionCodeResponse = await lambda.updateFunctionCode({
FunctionName: functionName,
S3Bucket: lambdaCodeChange.code.s3Bucket,
S3Key: lambdaCodeChange.code.s3Key,
ImageUri: lambdaCodeChange.code.imageUri,
ZipFile: lambdaCodeChange.code.functionCodeZip,
S3ObjectVersion: lambdaCodeChange.code.s3ObjectVersion,
});
await waitForLambdasPropertiesUpdateToFinish(updateFunctionCodeResponse, lambda, functionName);
}
if (lambdaCodeChange.configurations !== undefined) {
const updateRequest = {
FunctionName: functionName,
};
if (lambdaCodeChange.configurations.description !== undefined) {
updateRequest.Description = lambdaCodeChange.configurations.description;
}
if (lambdaCodeChange.configurations.environment !== undefined) {
updateRequest.Environment = lambdaCodeChange.configurations.environment;
}
const updateFunctionCodeResponse = await lambda.updateFunctionConfiguration(updateRequest);
await waitForLambdasPropertiesUpdateToFinish(updateFunctionCodeResponse, lambda, functionName);
}
// only if the code changed is there any point in publishing a new Version
const versions = dependencies.filter((d) => d.resourceType === 'AWS::Lambda::Version');
if (versions.length) {
const publishVersionPromise = lambda.publishVersion({
FunctionName: functionName,
});
const aliases = dependencies.filter((d) => d.resourceType === 'AWS::Lambda::Alias');
if (aliases.length) {
// we need to wait for the Version to finish publishing
const versionUpdate = await publishVersionPromise;
for (const alias of aliases) {
operations.push(lambda.updateAlias({
FunctionName: functionName,
Name: alias.physicalName,
FunctionVersion: versionUpdate.Version,
}));
}
}
else {
operations.push(publishVersionPromise);
}
}
}
// run all of our updates in parallel
// Limited set of updates per function
// eslint-disable-next-line @cdklabs/promiseall-no-unbounded-parallelism
await Promise.all(operations);
},
});
}
return ret;
}
/**
* Determines which changes to this Alias are hotswappable or not
*/
function classifyAliasChanges(change) {
const ret = [];
const classifiedChanges = (0, common_1.classifyChanges)(change, ['FunctionVersion']);
classifiedChanges.reportNonHotswappablePropertyChanges(ret);
// we only want to report not hotswappable changes to aliases
// the actual alias update will happen if we change the function
return ret;
}
/**
* Evaluates the hotswappable properties of an AWS::Lambda::Function and
* Returns a `LambdaFunctionChange` if the change is hotswappable.
* Returns `undefined` if the change is not hotswappable.
*/
async function evaluateLambdaFunctionProps(hotswappablePropChanges, runtime, evaluateCfnTemplate) {
/*
* At first glance, we would want to initialize these using the "previous" values (change.oldValue),
* in case only one of them changed, like the key, and the Bucket stayed the same.
* However, that actually fails for old-style synthesis, which uses CFN Parameters!
* Because the names of the Parameters depend on the hash of the Asset,
* the Parameters used for the "old" values no longer exist in `assetParams` at this point,
* which means we don't have the correct values available to evaluate the CFN expression with.
* Fortunately, the diff will always include both the s3Bucket and s3Key parts of the Lambda's Code property,
* even if only one of them was actually changed,
* which means we don't need the "old" values at all, and we can safely initialize these with just `''`.
*/
let code = undefined;
let description = undefined;
let environment = undefined;
for (const updatedPropName in hotswappablePropChanges) {
const updatedProp = hotswappablePropChanges[updatedPropName];
switch (updatedPropName) {
case 'Code':
let s3Bucket, s3Key, s3ObjectVersion, imageUri, functionCodeZip;
for (const newPropName in updatedProp.newValue) {
switch (newPropName) {
case 'S3Bucket':
s3Bucket = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);
break;
case 'S3Key':
s3Key = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);
break;
case 'S3ObjectVersion':
s3ObjectVersion = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);
break;
case 'ImageUri':
imageUri = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);
break;
case 'ZipFile':
// We must create a zip package containing a file with the inline code
const functionCode = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);
const functionRuntime = await evaluateCfnTemplate.evaluateCfnExpression(runtime);
if (!functionRuntime) {
return undefined;
}
// file extension must be chosen depending on the runtime
const codeFileExt = determineCodeFileExtFromRuntime(functionRuntime);
functionCodeZip = await zipString(`index.${codeFileExt}`, functionCode);
break;
}
}
code = {
s3Bucket,
s3Key,
s3ObjectVersion,
imageUri,
functionCodeZip,
};
break;
case 'Description':
description = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue);
break;
case 'Environment':
environment = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue);
break;
default:
// we will never get here, but just in case we do throw an error
throw new api_1.ToolkitError('while apply()ing, found a property that cannot be hotswapped. Please report this at github.com/aws/aws-cdk/issues/new/choose');
}
}
const configurations = description || environment ? { description, environment } : undefined;
return code || configurations ? { code, configurations } : undefined;
}
/**
* Compress a string as a file, returning a promise for the zip buffer
* https://github.com/archiverjs/node-archiver/issues/342
*/
function zipString(fileName, rawString) {
return new Promise((resolve, reject) => {
const buffers = [];
const converter = new stream_1.Writable();
converter._write = (chunk, _, callback) => {
buffers.push(chunk);
process.nextTick(callback);
};
converter.on('finish', () => {
resolve(Buffer.concat(buffers));
});
const archive = archiver('zip');
archive.on('error', (err) => {
reject(err);
});
archive.pipe(converter);
archive.append(rawString, {
name: fileName,
date: new Date('1980-01-01T00:00:00.000Z'), // Add date to make resulting zip file deterministic
});
void archive.finalize();
});
}
/**
* After a Lambda Function is updated, it cannot be updated again until the
* `State=Active` and the `LastUpdateStatus=Successful`.
*
* Depending on the configuration of the Lambda Function this could happen relatively quickly
* or very slowly. For example, Zip based functions _not_ in a VPC can take ~1 second whereas VPC
* or Container functions can take ~25 seconds (and 'idle' VPC functions can take minutes).
*/
async function waitForLambdasPropertiesUpdateToFinish(currentFunctionConfiguration, lambda, functionName) {
const functionIsInVpcOrUsesDockerForCode = currentFunctionConfiguration.VpcConfig?.VpcId || currentFunctionConfiguration.PackageType === 'Image';
// if the function is deployed in a VPC or if it is a container image function
// then the update will take much longer and we can wait longer between checks
// otherwise, the update will be quick, so a 1-second delay is fine
const delaySeconds = functionIsInVpcOrUsesDockerForCode ? 5 : 1;
await lambda.waitUntilFunctionUpdated(delaySeconds, {
FunctionName: functionName,
});
}
/**
* Get file extension from Lambda runtime string.
* We use this extension to create a deployment package from Lambda inline code.
*/
function determineCodeFileExtFromRuntime(runtime) {
if (runtime.startsWith('node')) {
return 'js';
}
if (runtime.startsWith('python')) {
return 'py';
}
// Currently inline code only supports Node.js and Python, ignoring other runtimes.
// https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-code.html#aws-properties-lambda-function-code-properties
throw new cloudformation_1.CfnEvaluationException(`runtime ${runtime} is unsupported, only node.js and python runtimes are currently supported.`);
}
/**
* Finds all Versions that reference an AWS::Lambda::Function with logical ID `logicalId`
* and Aliases that reference those Versions.
*/
async function versionsAndAliases(logicalId, evaluateCfnTemplate) {
// find all Lambda Versions that reference this Function
const versionsReferencingFunction = evaluateCfnTemplate
.findReferencesTo(logicalId)
.filter((r) => r.Type === 'AWS::Lambda::Version');
// find all Lambda Aliases that reference the above Versions
const aliasesReferencingVersions = (0, util_1.flatMap)(versionsReferencingFunction, v => evaluateCfnTemplate.findReferencesTo(v.LogicalId));
return { versionsReferencingFunction, aliasesReferencingVersions };
}
async function dependantResources(logicalId, functionName, evaluateCfnTemplate) {
const candidates = await versionsAndAliases(logicalId, evaluateCfnTemplate);
// Limited set of updates per function
// eslint-disable-next-line @cdklabs/promiseall-no-unbounded-parallelism
const aliases = await Promise.all(candidates.aliasesReferencingVersions.map(async (a) => {
const name = await evaluateCfnTemplate.evaluateCfnExpression(a.Properties?.Name);
return {
logicalId: a.LogicalId,
resourceType: a.Type,
physicalName: name,
description: `${a.Type} '${name}' for AWS::Lambda::Function '${functionName}'`,
metadata: evaluateCfnTemplate.metadataFor(a.LogicalId),
};
}));
const versions = candidates.versionsReferencingFunction.map((v) => ({
logicalId: v.LogicalId,
resourceType: v.Type,
description: `${v.Type} for AWS::Lambda::Function '${functionName}'`,
metadata: evaluateCfnTemplate.metadataFor(v.LogicalId),
}));
return [
...versions,
...aliases,
];
}
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{ Writable } from 'stream';\nimport type { PropertyDifference } from '@aws-cdk/cloudformation-diff';\nimport type { FunctionConfiguration, UpdateFunctionConfigurationCommandInput } from '@aws-sdk/client-lambda';\nimport type { HotswapChange } from './common';\nimport { classifyChanges } from './common';\nimport { ToolkitError } from '../../../../@aws-cdk/tmp-toolkit-helpers/src/api';\nimport type { AffectedResource, ResourceChange } from '../../../../@aws-cdk/tmp-toolkit-helpers/src/api/io/payloads/hotswap';\nimport { flatMap } from '../../util';\nimport type { ILambdaClient, SDK } from '../aws-auth';\nimport { CfnEvaluationException, type EvaluateCloudFormationTemplate } from '../cloudformation';\n\n// namespace object imports won't work in the bundle for function exports\n// eslint-disable-next-line @typescript-eslint/no-require-imports\nconst archiver = require('archiver');\n\nexport async function isHotswappableLambdaFunctionChange(\n  logicalId: string,\n  change: ResourceChange,\n  evaluateCfnTemplate: EvaluateCloudFormationTemplate,\n): Promise<HotswapChange[]> {\n  // if the change is for a Lambda Version, we just ignore it\n  // we will publish a new version when we get to hotswapping the actual Function this Version points to\n  // (Versions can't be changed in CloudFormation anyway, they're immutable)\n  if (change.newValue.Type === 'AWS::Lambda::Version') {\n    return [];\n  }\n\n  // we handle Aliases specially too\n  // the actual alias update will happen if we change the function\n  if (change.newValue.Type === 'AWS::Lambda::Alias') {\n    return classifyAliasChanges(change);\n  }\n\n  if (change.newValue.Type !== 'AWS::Lambda::Function') {\n    return [];\n  }\n\n  const ret: HotswapChange[] = [];\n  const classifiedChanges = classifyChanges(change, ['Code', 'Environment', 'Description']);\n  classifiedChanges.reportNonHotswappablePropertyChanges(ret);\n\n  const functionName = await evaluateCfnTemplate.establishResourcePhysicalName(\n    logicalId,\n    change.newValue.Properties?.FunctionName,\n  );\n  const namesOfHotswappableChanges = Object.keys(classifiedChanges.hotswappableProps);\n  if (functionName && namesOfHotswappableChanges.length > 0) {\n    const lambdaCodeChange = await evaluateLambdaFunctionProps(\n      classifiedChanges.hotswappableProps,\n      change.newValue.Properties?.Runtime,\n      evaluateCfnTemplate,\n    );\n\n    // nothing to do here\n    if (lambdaCodeChange === undefined) {\n      return ret;\n    }\n\n    const dependencies = await dependantResources(logicalId, functionName, evaluateCfnTemplate);\n\n    ret.push({\n      change: {\n        cause: change,\n        resources: [\n          {\n            logicalId,\n            resourceType: change.newValue.Type,\n            physicalName: functionName,\n            metadata: evaluateCfnTemplate.metadataFor(logicalId),\n          },\n          ...dependencies,\n        ],\n      },\n      hotswappable: true,\n      service: 'lambda',\n      apply: async (sdk: SDK) => {\n        const lambda = sdk.lambda();\n        const operations: Promise<any>[] = [];\n\n        if (lambdaCodeChange.code !== undefined || lambdaCodeChange.configurations !== undefined) {\n          if (lambdaCodeChange.code !== undefined) {\n            const updateFunctionCodeResponse = await lambda.updateFunctionCode({\n              FunctionName: functionName,\n              S3Bucket: lambdaCodeChange.code.s3Bucket,\n              S3Key: lambdaCodeChange.code.s3Key,\n              ImageUri: lambdaCodeChange.code.imageUri,\n              ZipFile: lambdaCodeChange.code.functionCodeZip,\n              S3ObjectVersion: lambdaCodeChange.code.s3ObjectVersion,\n            });\n\n            await waitForLambdasPropertiesUpdateToFinish(updateFunctionCodeResponse, lambda, functionName);\n          }\n\n          if (lambdaCodeChange.configurations !== undefined) {\n            const updateRequest: UpdateFunctionConfigurationCommandInput = {\n              FunctionName: functionName,\n            };\n            if (lambdaCodeChange.configurations.description !== undefined) {\n              updateRequest.Description = lambdaCodeChange.configurations.description;\n            }\n            if (lambdaCodeChange.configurations.environment !== undefined) {\n              updateRequest.Environment = lambdaCodeChange.configurations.environment;\n            }\n            const updateFunctionCodeResponse = await lambda.updateFunctionConfiguration(updateRequest);\n            await waitForLambdasPropertiesUpdateToFinish(updateFunctionCodeResponse, lambda, functionName);\n          }\n\n          // only if the code changed is there any point in publishing a new Version\n          const versions = dependencies.filter((d) => d.resourceType === 'AWS::Lambda::Version');\n          if (versions.length) {\n            const publishVersionPromise = lambda.publishVersion({\n              FunctionName: functionName,\n            });\n\n            const aliases = dependencies.filter((d) => d.resourceType === 'AWS::Lambda::Alias');\n            if (aliases.length) {\n              // we need to wait for the Version to finish publishing\n              const versionUpdate = await publishVersionPromise;\n              for (const alias of aliases) {\n                operations.push(\n                  lambda.updateAlias({\n                    FunctionName: functionName,\n                    Name: alias.physicalName,\n                    FunctionVersion: versionUpdate.Version,\n                  }),\n                );\n              }\n            } else {\n              operations.push(publishVersionPromise);\n            }\n          }\n        }\n\n        // run all of our updates in parallel\n        // Limited set of updates per function\n        // eslint-disable-next-line @cdklabs/promiseall-no-unbounded-parallelism\n        await Promise.all(operations);\n      },\n    });\n  }\n\n  return ret;\n}\n\n/**\n * Determines which changes to this Alias are hotswappable or not\n */\nfunction classifyAliasChanges(change: ResourceChange): HotswapChange[] {\n  const ret: HotswapChange[] = [];\n  const classifiedChanges = classifyChanges(change, ['FunctionVersion']);\n  classifiedChanges.reportNonHotswappablePropertyChanges(ret);\n\n  // we only want to report not hotswappable changes to aliases\n  // the actual alias update will happen if we change the function\n\n  return ret;\n}\n\n/**\n * Evaluates the hotswappable properties of an AWS::Lambda::Function and\n * Returns a `LambdaFunctionChange` if the change is hotswappable.\n * Returns `undefined` if the change is not hotswappable.\n */\nasync function evaluateLambdaFunctionProps(\n  hotswappablePropChanges: Record<string, PropertyDifference<any>>,\n  runtime: string,\n  evaluateCfnTemplate: EvaluateCloudFormationTemplate,\n): Promise<LambdaFunctionChange | undefined> {\n  /*\n   * At first glance, we would want to initialize these using the \"previous\" values (change.oldValue),\n   * in case only one of them changed, like the key, and the Bucket stayed the same.\n   * However, that actually fails for old-style synthesis, which uses CFN Parameters!\n   * Because the names of the Parameters depend on the hash of the Asset,\n   * the Parameters used for the \"old\" values no longer exist in `assetParams` at this point,\n   * which means we don't have the correct values available to evaluate the CFN expression with.\n   * Fortunately, the diff will always include both the s3Bucket and s3Key parts of the Lambda's Code property,\n   * even if only one of them was actually changed,\n   * which means we don't need the \"old\" values at all, and we can safely initialize these with just `''`.\n   */\n  let code: LambdaFunctionCode | undefined = undefined;\n  let description: string | undefined = undefined;\n  let environment: { [key: string]: string } | undefined = undefined;\n\n  for (const updatedPropName in hotswappablePropChanges) {\n    const updatedProp = hotswappablePropChanges[updatedPropName];\n\n    switch (updatedPropName) {\n      case 'Code':\n        let s3Bucket, s3Key, s3ObjectVersion, imageUri, functionCodeZip;\n\n        for (const newPropName in updatedProp.newValue) {\n          switch (newPropName) {\n            case 'S3Bucket':\n              s3Bucket = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);\n              break;\n            case 'S3Key':\n              s3Key = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);\n              break;\n            case 'S3ObjectVersion':\n              s3ObjectVersion = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);\n              break;\n            case 'ImageUri':\n              imageUri = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);\n              break;\n            case 'ZipFile':\n              // We must create a zip package containing a file with the inline code\n              const functionCode = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue[newPropName]);\n              const functionRuntime = await evaluateCfnTemplate.evaluateCfnExpression(runtime);\n              if (!functionRuntime) {\n                return undefined;\n              }\n              // file extension must be chosen depending on the runtime\n              const codeFileExt = determineCodeFileExtFromRuntime(functionRuntime);\n              functionCodeZip = await zipString(`index.${codeFileExt}`, functionCode);\n              break;\n          }\n        }\n        code = {\n          s3Bucket,\n          s3Key,\n          s3ObjectVersion,\n          imageUri,\n          functionCodeZip,\n        };\n        break;\n      case 'Description':\n        description = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue);\n        break;\n      case 'Environment':\n        environment = await evaluateCfnTemplate.evaluateCfnExpression(updatedProp.newValue);\n        break;\n      default:\n        // we will never get here, but just in case we do throw an error\n        throw new ToolkitError(\n          'while apply()ing, found a property that cannot be hotswapped. Please report this at github.com/aws/aws-cdk/issues/new/choose',\n        );\n    }\n  }\n\n  const configurations = description || environment ? { description, environment } : undefined;\n  return code || configurations ? { code, configurations } : undefined;\n}\n\ninterface LambdaFunctionCode {\n  readonly s3Bucket?: string;\n  readonly s3Key?: string;\n  readonly s3ObjectVersion?: string;\n  readonly imageUri?: string;\n  readonly functionCodeZip?: Buffer;\n}\n\ninterface LambdaFunctionConfigurations {\n  readonly description?: string;\n  readonly environment?: { [key: string]: string };\n}\n\ninterface LambdaFunctionChange {\n  readonly code?: LambdaFunctionCode;\n  readonly configurations?: LambdaFunctionConfigurations;\n}\n\n/**\n * Compress a string as a file, returning a promise for the zip buffer\n * https://github.com/archiverjs/node-archiver/issues/342\n */\nfunction zipString(fileName: string, rawString: string): Promise<Buffer> {\n  return new Promise((resolve, reject) => {\n    const buffers: Buffer[] = [];\n\n    const converter = new Writable();\n\n    converter._write = (chunk: Buffer, _: string, callback: () => void) => {\n      buffers.push(chunk);\n      process.nextTick(callback);\n    };\n\n    converter.on('finish', () => {\n      resolve(Buffer.concat(buffers));\n    });\n\n    const archive = archiver('zip');\n\n    archive.on('error', (err: any) => {\n      reject(err);\n    });\n\n    archive.pipe(converter);\n\n    archive.append(rawString, {\n      name: fileName,\n      date: new Date('1980-01-01T00:00:00.000Z'), // Add date to make resulting zip file deterministic\n    });\n\n    void archive.finalize();\n  });\n}\n\n/**\n * After a Lambda Function is updated, it cannot be updated again until the\n * `State=Active` and the `LastUpdateStatus=Successful`.\n *\n * Depending on the configuration of the Lambda Function this could happen relatively quickly\n * or very slowly. For example, Zip based functions _not_ in a VPC can take ~1 second whereas VPC\n * or Container functions can take ~25 seconds (and 'idle' VPC functions can take minutes).\n */\nasync function waitForLambdasPropertiesUpdateToFinish(\n  currentFunctionConfiguration: FunctionConfiguration,\n  lambda: ILambdaClient,\n  functionName: string,\n): Promise<void> {\n  const functionIsInVpcOrUsesDockerForCode =\n    currentFunctionConfiguration.VpcConfig?.VpcId || currentFunctionConfiguration.PackageType === 'Image';\n\n  // if the function is deployed in a VPC or if it is a container image function\n  // then the update will take much longer and we can wait longer between checks\n  // otherwise, the update will be quick, so a 1-second delay is fine\n  const delaySeconds = functionIsInVpcOrUsesDockerForCode ? 5 : 1;\n\n  await lambda.waitUntilFunctionUpdated(delaySeconds, {\n    FunctionName: functionName,\n  });\n}\n\n/**\n * Get file extension from Lambda runtime string.\n * We use this extension to create a deployment package from Lambda inline code.\n */\nfunction determineCodeFileExtFromRuntime(runtime: string): string {\n  if (runtime.startsWith('node')) {\n    return 'js';\n  }\n  if (runtime.startsWith('python')) {\n    return 'py';\n  }\n  // Currently inline code only supports Node.js and Python, ignoring other runtimes.\n  // https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-code.html#aws-properties-lambda-function-code-properties\n  throw new CfnEvaluationException(\n    `runtime ${runtime} is unsupported, only node.js and python runtimes are currently supported.`,\n  );\n}\n\n/**\n * Finds all Versions that reference an AWS::Lambda::Function with logical ID `logicalId`\n * and Aliases that reference those Versions.\n */\nasync function versionsAndAliases(logicalId: string, evaluateCfnTemplate: EvaluateCloudFormationTemplate) {\n  // find all Lambda Versions that reference this Function\n  const versionsReferencingFunction = evaluateCfnTemplate\n    .findReferencesTo(logicalId)\n    .filter((r) => r.Type === 'AWS::Lambda::Version');\n  // find all Lambda Aliases that reference the above Versions\n  const aliasesReferencingVersions = flatMap(versionsReferencingFunction, v =>\n    evaluateCfnTemplate.findReferencesTo(v.LogicalId));\n\n  return { versionsReferencingFunction, aliasesReferencingVersions };\n}\n\nasync function dependantResources(\n  logicalId: string,\n  functionName: string,\n  evaluateCfnTemplate: EvaluateCloudFormationTemplate,\n): Promise<Array<AffectedResource>> {\n  const candidates = await versionsAndAliases(logicalId, evaluateCfnTemplate);\n\n  // Limited set of updates per function\n  // eslint-disable-next-line @cdklabs/promiseall-no-unbounded-parallelism\n  const aliases = await Promise.all(candidates.aliasesReferencingVersions.map(async (a) => {\n    const name = await evaluateCfnTemplate.evaluateCfnExpression(a.Properties?.Name);\n    return {\n      logicalId: a.LogicalId,\n      resourceType: a.Type,\n      physicalName: name,\n      description: `${a.Type} '${name}' for AWS::Lambda::Function '${functionName}'`,\n      metadata: evaluateCfnTemplate.metadataFor(a.LogicalId),\n    };\n  }));\n\n  const versions = candidates.versionsReferencingFunction.map((v) => (\n    {\n      logicalId: v.LogicalId,\n      resourceType: v.Type,\n      description: `${v.Type} for AWS::Lambda::Function '${functionName}'`,\n      metadata: evaluateCfnTemplate.metadataFor(v.LogicalId),\n    }\n  ));\n\n  return [\n    ...versions,\n    ...aliases,\n  ];\n}\n"]}