[[aws-lambda-component]]
== AWS Lambda Component

*Available as of Camel version 2.20*

The Lambda component supports create, get, list, delete and invoke
https://aws.amazon.com/lambda/[AWS Lambda] functions.

*Prerequisites*

You must have a valid Amazon Web Services developer account, and be
signed up to use Amazon Lambda. More information is available at
https://aws.amazon.com/lambda/[AWS Lambda].

When creating a Lambda function, you need to specify a IAM role which has at least the AWSLambdaBasicExecuteRole policy attached.

*Warning*

Lambda is regional service. Unlike S3 bucket, Lambda function created in a given region is not available on other regions.

### URI Format

[source,java]
-------------------------
aws-lambda://functionName[?options]
-------------------------

You can append query options to the URI in the following format,
?options=value&option2=value&...

### URI Options


// component options: START
The AWS Lambda component supports 6 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *configuration* (advanced) | The AWS Lambda default configuration |  | LambdaConfiguration
| *accessKey* (producer) | Amazon AWS Access Key |  | String
| *secretKey* (producer) | Amazon AWS Secret Key |  | String
| *region* (producer) | Amazon AWS Region |  | String
| *resolveProperty Placeholders* (advanced) | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | boolean
| *basicPropertyBinding* (advanced) | Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities | false | boolean
|===
// component options: END




// endpoint options: START
The AWS Lambda endpoint is configured using URI syntax:

----
aws-lambda:function
----

with the following path and query parameters:

==== Path Parameters (1 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *function* | *Required* Name of the Lambda function. |  | String
|===


==== Query Parameters (9 parameters):


[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *operation* (producer) | *Required* The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction |  | LambdaOperations
| *region* (producer) | Amazon AWS Region |  | String
| *awsLambdaClient* (advanced) | To use a existing configured AwsLambdaClient as client |  | AWSLambda
| *basicPropertyBinding* (advanced) | Whether the endpoint should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities | false | boolean
| *synchronous* (advanced) | Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported). | false | boolean
| *proxyHost* (proxy) | To define a proxy host when instantiating the Lambda client |  | String
| *proxyPort* (proxy) | To define a proxy port when instantiating the Lambda client |  | Integer
| *accessKey* (security) | Amazon AWS Access Key |  | String
| *secretKey* (security) | Amazon AWS Secret Key |  | String
|===
// endpoint options: END
// spring-boot-auto-configure options: START
=== Spring Boot Auto-Configuration

When using Spring Boot make sure to use the following Maven dependency to have support for auto configuration:

[source,xml]
----
<dependency>
  <groupId>org.apache.camel</groupId>
  <artifactId>camel-aws-lambda-starter</artifactId>
  <version>x.x.x</version>
  <!-- use the same version as your Camel core version -->
</dependency>
----


The component supports 14 options, which are listed below.



[width="100%",cols="2,5,^1,2",options="header"]
|===
| Name | Description | Default | Type
| *camel.component.aws-lambda.access-key* | Amazon AWS Access Key |  | String
| *camel.component.aws-lambda.basic-property-binding* | Whether the component should use basic property binding (Camel 2.x) or the newer property binding with additional capabilities | false | Boolean
| *camel.component.aws-lambda.configuration.access-key* | Amazon AWS Access Key |  | String
| *camel.component.aws-lambda.configuration.aws-lambda-client* | To use a existing configured AwsLambdaClient as client |  | AWSLambda
| *camel.component.aws-lambda.configuration.function* | Name of the Lambda function. |  | String
| *camel.component.aws-lambda.configuration.operation* | The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction |  | LambdaOperations
| *camel.component.aws-lambda.configuration.proxy-host* | To define a proxy host when instantiating the Lambda client |  | String
| *camel.component.aws-lambda.configuration.proxy-port* | To define a proxy port when instantiating the Lambda client |  | Integer
| *camel.component.aws-lambda.configuration.region* | Amazon AWS Region |  | String
| *camel.component.aws-lambda.configuration.secret-key* | Amazon AWS Secret Key |  | String
| *camel.component.aws-lambda.enabled* | Whether to enable auto configuration of the aws-lambda component. This is enabled by default. |  | Boolean
| *camel.component.aws-lambda.region* | Amazon AWS Region |  | String
| *camel.component.aws-lambda.resolve-property-placeholders* | Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders. | true | Boolean
| *camel.component.aws-lambda.secret-key* | Amazon AWS Secret Key |  | String
|===
// spring-boot-auto-configure options: END




Required Lambda component options

You have to provide the awsLambdaClient in the
Registry or your accessKey and secretKey to access
the https://aws.amazon.com/lambda/[Amazon Lambda] service.

### Usage

#### Message headers evaluated by the Lambda producer

[width="100%",cols="5%,5%,10%,75%,5%",options="header",]
|=======================================================================
|Operation |Header |Type |Description |Required

|All |`CamelAwsLambdaOperation` |`String` |The operation we want to perform. Override operation passed as query parameter| Yes

|createFunction |`CamelAwsLambdaS3Bucket` |`String` |Amazon S3 bucket name where the .zip file containing
your deployment package is stored. This bucket must reside in the same AWS region where you are creating the Lambda function.| No

|createFunction |`CamelAwsLambdaS3Key` |`String` |The Amazon S3 object (the deployment package) key name
you want to upload.| No

|createFunction |`CamelAwsLambdaS3ObjectVersion` |String |The Amazon S3 object (the deployment package) version
you want to upload.| No

|createFunction |`CamelAwsLambdaZipFile` |`String` |The local path of the zip file (the deployment package).
 Content of zip file can also be put in Message body.| No

|createFunction |`CamelAwsLambdaRole` |`String` |The Amazon Resource Name (ARN) of the IAM role that Lambda assumes
 when it executes your function to access any other Amazon Web Services (AWS) resources. |Yes

|createFunction |`CamelAwsLambdaRuntime` |String |The runtime environment for the Lambda function you are uploading.
 (nodejs, nodejs4.3, nodejs6.10, java8, python2.7, python3.6, dotnetcore1.0, odejs4.3-edge) |Yes

|createFunction |`CamelAwsLambdaHandler` |`String` |The function within your code that Lambda calls to begin execution.
 For Node.js, it is the module-name.export value in your function.
 For Java, it can be package.class-name::handler or package.class-name.|Yes

|createFunction |`CamelAwsLambdaDescription` |`String` |The user-provided description.|No

|createFunction |`CamelAwsLambdaTargetArn` |`String` |The parent object that contains the target ARN (Amazon Resource Name)
of an Amazon SQS queue or Amazon SNS topic.|No

|createFunction |`CamelAwsLambdaMemorySize` |`Integer` |The memory size, in MB, you configured for the function.
Must be a multiple of 64 MB.|No

|createFunction |`CamelAwsLambdaKMSKeyArn` |`String` |The Amazon Resource Name (ARN) of the KMS key used to encrypt your function's environment variables.
If not provided, AWS Lambda will use a default service key.|No

|createFunction |`CamelAwsLambdaPublish` |`Boolean` |This boolean parameter can be used to request AWS Lambda
to create the Lambda function and publish a version as an atomic operation.|No

|createFunction |`CamelAwsLambdaTimeout` |`Integer` |The function execution time at which Lambda should terminate the function.
The default is 3 seconds.|No

|createFunction |`CamelAwsLambdaTracingConfig` |`String` |Your function's tracing settings (Active or PassThrough).|No

|createFunction |`CamelAwsLambdaEnvironmentVariables` |`Map<String, String>` |The key-value pairs that represent your environment's configuration settings.|No

|createFunction |`CamelAwsLambdaEnvironmentTags` |`Map<String, String>` |The list of tags (key-value pairs) assigned to the new function.|No

|createFunction |`CamelAwsLambdaSecurityGroupIds` |`List<String>` |If your Lambda function accesses resources in a VPC, a list of one or more security groups IDs in your VPC.|No

|createFunction |`CamelAwsLambdaSubnetIds` |`List<String>` |If your Lambda function accesses resources in a VPC, a list of one or more subnet IDs in your VPC.|No

|=======================================================================

### List of Avalaible Operations

- listFunctions
- getFunction,
- createFunction
- deleteFunction
- invokeFunction
- updateFunction
- createEventSourceMapping
- deleteEventSourceMapping
- listEventSourceMapping
- listTags
- tagResource
- untagResource
- publishVersion
- listVersions

### Example

To have a full understanding of how the component works, you may have a look at this https://github.com/apache/camel/blob/master/components/camel-aws/src/test/java/org/apache/camel/component/aws/lambda/integration/LambdaComponentIntegrationTest.java[integration test]

### Automatic detection of AmazonLambda client in registry

From Camel 3.0.0-M3 the component will be able to detect the presence of an AmazonLambda bean into the registry.
If it's the only instance of that type it will be used as client and you won't have to define it as uri parameter.
This may be really useful for smarter configuration of the endpoint.


### Dependencies

Maven users will need to add the following dependency to their pom.xml.

*pom.xml*

[source,xml]
---------------------------------------
<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws-lambda</artifactId>
    <version>${camel-version}</version>
</dependency>
---------------------------------------

where `${camel-version}` must be replaced by the actual version of Camel
(2.16 or higher).

### See Also

* Configuring Camel
* Component
* Endpoint
* Getting Started

* AWS Component
