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# Lambda code examples for the SDK for Ruby

## Overview

Shows how to use the AWS SDK for Ruby to work with AWS Lambda.

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*Lambda allows you to run code without provisioning or managing servers.*

## ⚠ Important

* Running this code might result in charges to your AWS account.
* Running the tests might result in charges to your AWS account.
* We recommend that you grant your code least privilege. At most, grant only the minimum permissions required to perform the task. For more information, see [Grant least privilege](https://docs.aws.amazon.com/IAM/latest/UserGuide/best-practices.html#grant-least-privilege).
* This code is not tested in every AWS Region. For more information, see [AWS Regional Services](https://aws.amazon.com/about-aws/global-infrastructure/regional-product-services).

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## Code examples

### Prerequisites

For prerequisites, see the [README](../../README.md#Prerequisites) in the `ruby` folder.


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### Single actions

Code excerpts that show you how to call individual service functions.

* [Create a function](lambda_basics.rb#L127) (`CreateFunction`)
* [Delete a function](lambda_basics.rb#L277) (`DeleteFunction`)
* [Get a function](lambda_basics.rb#L110) (`GetFunction`)
* [Invoke a function](lambda_basics.rb#L164) (`Invoke`)
* [List functions](lambda_basics.rb#L262) (`ListFunctions`)
* [Update function code](lambda_basics.rb#L237) (`UpdateFunctionCode`)
* [Update function configuration](lambda_basics.rb#L212) (`UpdateFunctionConfiguration`)

### Scenarios

Code examples that show you how to accomplish a specific task by calling multiple
functions within the same service.

* [Get started with functions](lambda_basics.rb) 

## Run the examples

### Instructions


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The quickest way to interact with this example code is to invoke a [Scenario](#Scenarios) from your command line. For example, `ruby some_scenario.rb` will invoke `some_scenario.rb`.
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#### Get started with functions

This example shows you how to do the following:

* Create an IAM role and Lambda function, then upload handler code.
* Invoke the function with a single parameter and get results.
* Update the function code and configure with an environment variable.
* Invoke the function with new parameters and get results. Display the returned execution log.
* List the functions for your account, then clean up resources.

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Start the example by running the following at a command prompt:

```
ruby lambda_basics.rb
```

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### Tests

⚠ Running tests might result in charges to your AWS account.


To find instructions for running these tests, see the [README](../../README.md#Tests)
in the `ruby` folder.


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## Contribute
Code examples thrive on community contribution.

To learn more about the contributing process, see [CONTRIBUTING.md](../../../CONTRIBUTING.md).
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## Additional resources

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* [More Ruby AWS Lambda code examples](https://docs.aws.amazon.com/sdk-for-ruby/v3/developer-guide/ruby_lambda_code_examples.html)
* [SDK for Ruby Developer Guide](https://aws.amazon.com/developer/language/ruby/)
* [SDK for Ruby Amazon Lambda Module](https://docs.aws.amazon.com/sdk-for-ruby/v3/api/Aws/Lambda.html)
* [AWS Lambda Developer Guide](https://docs.aws.amazon.com/lambda/latest/dg/welcome.html)
* [AWS Lambda API Reference](https://docs.aws.amazon.com/lambda/latest/dg/API_Reference.html)
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SPDX-License-Identifier: Apache-2.0