@aws-sdk/client-lambda-node

Description

AWS Lambda

Overview

This is the AWS Lambda API Reference. The AWS Lambda Developer Guide provides additional information. For the service overview, see What is AWS Lambda, and for information about how the service works, see AWS Lambda: How it Works in the AWS Lambda Developer Guide.

Installing

To install the this package using NPM, simply type the following into a terminal window:

npm install @aws-sdk/client-lambda-node

Getting Started

Import

The AWS SDK is modulized by clients and commends in CommonJS modules. To send a request, you only need to import the client(LambdaClient) and the commands you need, for example InvokeAsyncCommand:

//javascript
const { LambdaClient } = require('@aws-sdk/client-lambda-node/LambdaClient');
const { InvokeAsyncCommand } = require('@aws-sdk/client-lambda-node/InvokeAsyncCommand');

//typescript
const { LambdaClient } = import '@aws-sdk/client-lambda-node/LambdaClient';
const { InvokeAsyncCommand } = import '@aws-sdk/client-lambda-node/commands/InvokeAsyncCommand';

Usage

To send a request, you:

Initiate client with configurations.(credentials, region). For more information you can refer to the API reference.
Initiate command with input parameters.
Call send operation of client with command object as input.
If you are using a custom http handler, you may call destroy() to close open connections.

const lambda = new LambdaClient({region: 'region'});
//clients can be shared by different commands
const params = {
    FunctionName: /**a string value*/,
    InvokeArgs: /**a blob value*/
    /**You can supply readable stream to streaming input. e.g. fs.createReadStream(file) */,
};
const invokeAsyncCommand = new InvokeAsyncCommand(params);
lambda.send(invokeAsyncCommand).then(data => {
    // do something
}).catch(error => {
    // error handling
})

Besides using promise style, there are 2 other ways to send a request:

// async/await
try {
    const data = await lambda.send(invokeAsyncCommand);
    // do something
} catch(error) {
    // error handling
}

// callback
lambda.send(invokeAsyncCommand, (err, data) => {
    //do something
})

Besides using send(), the SDK can also send requests using the simplified callback style in version 2 of the SDK.

import * as AWS from '@aws-sdk/@aws-sdk/client-lambda-node/Lambda';
const lambda = new AWS.Lambda({region: 'region'})
lambda.invokeAsync(params, (err, data) => {
    //do something
})

Troubleshooting

When the service returns an exception, inpecting the exceptions is always helpful. You can not only access the exception information but also response metadata(i.e request id).

try {
    const data = await lambda.send(invokeAsyncCommand);
    // do something
} catch(error) {
    const metadata = error.$metadata;
    console.log(
`requestId: ${metadata.requestId}
cfId: ${metadata.cfId}
extendedRequestId: ${metadata.extendedRequestId}`
    );
/*
The keys within exceptions are also parsed, you can access them by specifying exception names like below:
    if(error.name === 'SomeServiceException') {
        const value = error.specialKeyInException;
    }
*/
}

Getting Help

Please use these community resources for getting help. We use the GitHub issues for tracking bugs and feature requests and have limited bandwidth to address them.

Ask a question on StackOverflow and tag it with aws-sdk-js
Come join the AWS JavaScript community on gitter
If it turns out that you may have found a bug, please open an issue

Contributing

This client code is generated automatically. Any modifications will be overwritten the next time the `@aws-sdk/@aws-sdk/client-lambda-node' package is updated. To contribute to SDK you can checkout our code generator package.

License

This SDK is distributed under the Apache License, Version 2.0, see LICENSE for more information.