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node-lambda

node-lambda

node-lambda

Command line tool to locally run and deploy your node.js application to Amazon Lambda.

BuildStatus NPM version

$ node-lambda run

Installation

$ npm install -g node-lambda

Example App

The node-lambda-template example app makes it easy to get up and running.

Usage

There are 4 available commands.

$ node-lambda setup
$ node-lambda run
$ node-lambda package
$ node-lambda deploy

Commands

setup

Initializes the event.json, context.json, .env, deploy.env files, and event_sources.json files. event.json is where you mock your event. context.json is where you can add additional mock data to the context passed to your lambda function. .env is where you place your deployment configuration. deploy.env has the same format as .env, but is used for holding any environment/config variables that you need to be deployed with your code to Lambda but you don't want in version control (e.g. DB connection info). event_sources.json is used to set the event source of the Lambda function (Not all event sources available in Lambda are supported).

$ node-lambda setup --help

Usage: setup [options]

Sets up the .env file.


Options:
  -h, --help                        output usage information
  -j, --eventFile [event.json]      Event JSON File
  -x, --contextFile [context.json]  Context JSON File

After running setup, it's a good idea to gitignore the generated event.json and .env files, as well as .lambda.

$ echo -e ".env\ndeploy.env\nevent.json\n.lambda" >> .gitignore
Deploy env variables
AWS_ENVIRONMENT            // (default: '')
CONFIG_FILE                // (default: '')
EVENT_SOURCE_FILE          // (default: '')
EXCLUDE_GLOBS              // (default: '')
AWS_ACCESS_KEY_ID          // (default: not set!)
AWS_SECRET_ACCESS_KEY      // (default: not set!)
AWS_PROFILE =              // (default: '')
AWS_SESSION_TOKEN =        // (default: '')
AWS_REGION =               // (default: 'us-east-1,us-west-2,eu-west-1')
AWS_FUNCTION_NAME          // (default: package.json.name or 'UnnamedFunction')
AWS_HANDLER                // (default: 'index.handler')
AWS_ROLE_ARN || AWS_ROLE   // (default: 'missing')
AWS_MEMORY_SIZE            // (default: 128)
AWS_TIMEOUT                // (default: 60)
AWS_RUN_TIMEOUT            // (default: 3)
AWS_DESCRIPTION            // (default: package.json.description or '')
AWS_RUNTIME                // (default: 'nodejs6.10')
AWS_PUBLISH                // (default: false)
AWS_FUNCTION_VERSION       // (default: '')
AWS_VPC_SUBNETS            // (default: '')
AWS_VPC_SECURITY_GROUPS    // (default: '')
AWS_TRACING_CONFIG         // (default: '')
AWS_LOGS_RETENTION_IN_DAYS // (default: '')
EVENT_FILE                 // (default: 'event.json')
PACKAGE_DIRECTORY          // (default: not set)
CONTEXT_FILE               // (default: 'context.json')
PREBUILT_DIRECTORY         // (default: '')
SRC_DIRECTORY              // (default: '')
DEPLOY_TIMEOUT             // (default: '120000')
DOCKER_IMAGE               // (default: '')
DEPLOY_ZIPFILE             // (default: '')
AWS_DLQ_TARGET_ARN         // (default: not set)

run

Runs your Amazon Lambda index.js file locally. Passes event.json data to the Amazon Lambda event object.

$ node-lambda run --help

Usage: run|execute [options]

Run your Amazon Lambda application locally


Options:
  -h, --help                            output usage information
  -H, --handler [index.handler]         Lambda Handler {index.handler}
  -j, --eventFile [event.json]          Event JSON File
  -u, --runtime [nodejs6.10]            Lambda Runtime
  -t, --timeout [3]                     Lambda Timeout
  -f, --configFile []                   Path to file holding secret environment variables (e.g. "deploy.env")
  -x, --contextFile [context.json]      Context JSON File
  -M, --enableRunMultipleEvents [true]  Enable run multiple events

package

Bundles your application into a local zip file.

$ node-lambda package --help

Usage: package|zip [options]

Create zipped package for Amazon Lambda deployment


Options:
  -h, --help                        output usage information
  -A, --packageDirectory [build]    Local Package Directory
  -I, --dockerImage []              Docker image for npm install
  -n, --functionName [node-lambda]  Lambda FunctionName
  -H, --handler [index.handler]     Lambda Handler {index.handler}
  -e, --environment [development]   Choose environment {dev, staging, production}
  -x, --excludeGlobs [event.json]   Space-separated glob pattern(s) for additional exclude files (e.g. "event.json dotenv.sample")
  -D, --prebuiltDirectory []        Prebuilt directory

deploy

Bundles and deploys your application up to Amazon Lambda.

$ node-lambda deploy --help

Usage: deploy [options]

Deploy your application to Amazon Lambda


Options:
  -h, --help                          output usage information
  -e, --environment [development]     Choose environment {dev, staging, production}
  -a, --accessKey [your_key]          AWS Access Key
  -s, --secretKey [your_secret]       AWS Secret Key
  -P, --profile []                    AWS Profile
  -k, --sessionToken []               AWS Session Token
  -r, --region [us-east-1]            AWS Region
  -n, --functionName [node-lambda]    Lambda FunctionName
  -H, --handler [index.handler]       Lambda Handler {index.handler}
  -o, --role [your_amazon_role]       Amazon Role ARN
  -m, --memorySize [128]              Lambda Memory Size
  -t, --timeout [3]                   Lambda Timeout
  -d, --description [missing]         Lambda Description
  -u, --runtime [nodejs6.10]          Lambda Runtime
  -p, --publish [false]               Lambda Publish
  -L, --lambdaVersion []              Lambda Function Version
  -b, --vpcSubnets []                 Lambda Function VPC Subnets
  -g, --vpcSecurityGroups []          Lambda VPC Security Group
  -K, --kmsKeyArn []                  Lambda KMS Key ARN
  -Q, --deadLetterConfigTargetArn []  Lambda DLQ resource
  -T, --tracingConfig []              Lambda tracing settings
  -R, --retentionInDays []            CloudWatchLogs retentionInDays settings
  -A, --packageDirectory [build]      Local Package Directory
  -G, --sourceDirectory []            Path to lambda source Directory (e.g. "./some-lambda")
  -I, --dockerImage []                Docker image for npm install
  -f, --configFile []                 Path to file holding secret environment variables (e.g. "deploy.env")
  -S, --eventSourceFile []            Path to file holding event source mapping variables (e.g. "event_sources.json")
  -x, --excludeGlobs [event.json]     Space-separated glob pattern(s) for additional exclude files (e.g. "event.json dotenv.sample")
  -D, --prebuiltDirectory []          Prebuilt directory
  -T, --deployTimeout [120000]        Deploy Timeout
  -z, --deployZipfile []              Deploy zipfile
  -y, --proxy []                      Proxy server

Custom Environment Variables

AWS Lambda will let you set environment variables for your function. Use the sample deploy.env file in combination with the --configFile flag to set values which will be added to the lambda configuration upon deploy. Environment variables will also be set when running locally using the same flag

Node.js Runtime Configuration

AWS Lambda now supports Node.js 6.10 and Node.js 4.3. Please also check the Programming Model (Node.js) page.

Post install script

When running node-lambda deploy if you need to do some action after npm install --production and before deploying to AWS Lambda (e.g. replace some modules with precompiled ones or download some libraries, replace some config file depending on environment) you can create post_install.sh script. If the file exists the script will be executed (and output shown after execution) if not it is skipped. Environment string is passed to script as first parameter so you can use it if needed. Make sure that the script is executable.

Example post_install.sh:

printf "\n\n######  Post install script  ###### \n"
ENV="production";
if [ ! -z $1 ]
  then
    ENV=$1;
fi
cp -v "config_$ENV.js" "config.js" \
&& printf "######  DONE!  ###### \n\n"

Post invoke script (example)

If you wish to invoke your deployed AWS Lambda function, you can add the following as a script to your package.json:

"invoke:remote": "aws lambda invoke --function-name myLambdaFnName --payload fileb://fixtures/hi.json invoked.json --log-type Tail | jq -r '.LogResult' | base64 --decode && rm invoked.json"

Prebuilt packages

The --prebuiltDirectory flag is useful for working with Webpack for example. It skips npm install --production and post_install.sh and simply packages the specified directory.

Handling npm link and Dependencies With Local Paths

Perhaps the easiest way to handle these cases is to bundle the code using Webpack and use the --prebuiltDirectory flag to package the output for deployment.

ScheduleEvents

Optional Parameter

When using the eventSourceFile flag (-S or --eventSourceFile) to set a ScheduleEvent trigger, you can pass an optional ScheduleDescription key into the ScheduleEvent object with a custom description for the CloudWatch event rule you are defining. By default, node-lambda generates a ScheduleDescription for you based on the ScheduleName and ScheduleExpression of the rule.

Note on ScheduleState for ScheduleEvents

When setting ScheduleState to ENABLED or DISABLED for ScheduleEvents, it is useful to note that this sets the state of the CloudWatch Event rule but DOES NOT set the state of the trigger for the Lambda function you are deploying; ScheduleEvent triggers are enabled by default in the Lambda console when added using the eventSourceFile flag.

Known Issue

Duplicate ScheduleEvent Triggers

If you are adding a trigger via the eventSourceFile for the first time, remove preexisting triggers from the Lambda console before deploying. Deploying a Lambda with the --eventSourceFile flag will NOT overwrite the same triggers created from the AWS console and may result in a duplicate triggers for the same rule.

Other AWS Lambda Tools Projects

Contributing

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Coding style

This project uses JavaScript Standard Style.

JavaScript Style Guide

Running tests

$ npm install
$ npm test