@aws-cdk/aws-lambda

AWS Lambda Construct Library

This construct library allows you to define AWS Lambda Functions.

import lambda = require('@aws-cdk/aws-lambda');

const fn = new lambda.Function(this, 'MyFunction', {
    runtime: lambda.Runtime.NodeJS810,
    handler: 'index.handler'
    code: lambda.Code.inline('exports.handler = function(event, ctx, cb) { return cb(null, "hi"); }'),
});

Handler Code

The lambda.Code class includes static convenience methods for various types of runtime code.

• lambda.Code.bucket(bucket, key[, objectVersion]) - specify an S3 object that contains the archive of your runtime code.
• lambda.Code.inline(code) - inline the handle code as a string. This is limited to 4KB. The class InlineJavaScriptLambda can be used to simplify inlining JavaScript functions.
• lambda.Code.directory(directory) - specify a directory in the local filesystem which will be zipped and uploaded to S3 before deployment.
• lambda.Code.file(path) - specify a file to be used for Lambda code. This can be, for example a JAR or a ZIP file, based on the runtime used.

The following example shows how to define a Python function and deploy the code from the local directory my-lambda-handler to it:

Example of Lambda Code from Local Assets

When deploying a stack that contains this code, the directory will be zip archived and then uploaded to an S3 bucket, then the exact location of the S3 objects will be passed when the stack is deployed.

Lambda in CodePipeline

This module also contains an Action that allows you to invoke a Lambda function from CodePipeline:

import codepipeline = require('@aws-cdk/aws-codepipeline');
import lambda = require('@aws-cdk/aws-lambda');

const lambdaFun = new lambda.Function(this, 'MyLambda', {
    // some lambda parameters here...
});

const pipeline = new codepipeline.Pipeline(this, 'MyPipeline');
const lambdaStage = new codepipeline.Stage(this, 'Lambda', {
    pipeline,
});
new lambda.PipelineInvokeAction(this, 'Lambda', {
    stage: lambdaStage,
    lambda: lambdaFun,
});

See the AWS documentation on how to write a Lambda function invoked from CodePipeline.

Lambda with DLQ

import lambda = require('@aws-cdk/aws-lambda');

const fn = new lambda.Function(this, 'MyFunction', {
    runtime: lambda.Runtime.NodeJS810,
    handler: 'index.handler'
    code: lambda.Code.inline('exports.handler = function(event, ctx, cb) { return cb(null, "hi"); }'),
    deadLetterQueueEnabled: true
});

See the AWS documentation to learn more about AWS Lambdas and DLQs.

Lambda with X-Ray Tracing

import lambda = require('@aws-cdk/aws-lambda');

const fn = new lambda.Function(this, 'MyFunction', {
    runtime: lambda.Runtime.NodeJS810,
    handler: 'index.handler'
    code: lambda.Code.inline('exports.handler = function(event, ctx, cb) { return cb(null, "hi"); }'),
    tracing: lambda.Tracing.Active
});

See the AWS documentation to learn more about AWS Lambda's X-Ray support.