Chapter 8. AWS 2 Lambda Only producer is supported The AWS2 Lambda component supports create, get, list, delete and invoke 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 AWS Lambda . When creating a Lambda function, you need to specify a IAM role which has at least the AWSLambdaBasicExecuteRole policy attached. 8.1. Dependencies When using aws2-lambda with Red Hat build of Camel Spring Boot, add the following Maven dependency to your pom.xml to have support for auto configuration: <dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-aws2-lambda-starter</artifactId> </dependency> 8.2. URI Format You can append query options to the URI in the following format, options=value&option2=value&... 8.3. Configuring Options Camel components are configured on two separate levels: component level endpoint level 8.3.1. Configuring Component Options At the component level, you set general and shared configurations that are, then, inherited by the endpoints. It is the highest configuration level. For example, a component may have security settings, credentials for authentication, urls for network connection and so forth. Some components only have a few options, and others may have many. Because components typically have pre-configured defaults that are commonly used, then you may often only need to configure a few options on a component; or none at all. You can configure components using: the Component DSL . in a configuration file (application.properties, *.yaml files, etc). directly in the Java code. 8.3.2. Configuring Endpoint Options You usually spend more time setting up endpoints because they have many options. These options help you customize what you want the endpoint to do. The options are also categorized into whether the endpoint is used as a consumer (from), as a producer (to), or both. Configuring endpoints is most often done directly in the endpoint URI as path and query parameters. You can also use the Endpoint DSL and DataFormat DSL as a type safe way of configuring endpoints and data formats in Java. A good practice when configuring options is to use Property Placeholders . Property placeholders provide a few benefits: They help prevent using hardcoded urls, port numbers, sensitive information, and other settings. They allow externalizing the configuration from the code. They help the code to become more flexible and reusable. The following two sections list all the options, firstly for the component followed by the endpoint. 8.4. Component Options The AWS Lambda component supports 16 options, which are listed below. Name Description Default Type configuration (producer) Component configuration. Lambda2Configuration lazyStartProducer (producer) Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false boolean operation (producer) The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction. Enum values: listFunctions getFunction createAlias deleteAlias getAlias listAliases createFunction deleteFunction invokeFunction updateFunction createEventSourceMapping deleteEventSourceMapping listEventSourceMapping listTags tagResource untagResource publishVersion listVersions invokeFunction Lambda2Operations overrideEndpoint (producer) Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option. false boolean pojoRequest (producer) If we want to use a POJO request as body or not. false boolean region (producer) The region in which Lambda client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example ap-east-1) You'll need to use the name Region.EU_WEST_1.id(). String trustAllCertificates (producer) If we want to trust all certificates in case of overriding the endpoint. false boolean uriEndpointOverride (producer) Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option. String useDefaultCredentialsProvider (producer) Set whether the Lambda client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in. false boolean autowiredEnabled (advanced) Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true boolean awsLambdaClient (advanced) Autowired To use a existing configured AwsLambdaClient as client. LambdaClient 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 proxyProtocol (proxy) To define a proxy protocol when instantiating the Lambda client. Enum values: HTTP HTTPS HTTPS Protocol accessKey (security) Amazon AWS Access Key. String secretKey (security) Amazon AWS Secret Key. String 8.5. Endpoint Options The AWS Lambda endpoint is configured using URI syntax: with the following path and query parameters: 8.5.1. Path Parameters (1 parameters) Name Description Default Type function (producer) Required Name of the Lambda function. String 8.5.2. Query Parameters (14 parameters) Name Description Default Type lazyStartProducer (producer) Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false boolean operation (producer) The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction. Enum values: listFunctions getFunction createAlias deleteAlias getAlias listAliases createFunction deleteFunction invokeFunction updateFunction createEventSourceMapping deleteEventSourceMapping listEventSourceMapping listTags tagResource untagResource publishVersion listVersions invokeFunction Lambda2Operations overrideEndpoint (producer) Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option. false boolean pojoRequest (producer) If we want to use a POJO request as body or not. false boolean region (producer) The region in which Lambda client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example ap-east-1) You'll need to use the name Region.EU_WEST_1.id(). String trustAllCertificates (producer) If we want to trust all certificates in case of overriding the endpoint. false boolean uriEndpointOverride (producer) Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option. String useDefaultCredentialsProvider (producer) Set whether the Lambda client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in. false boolean awsLambdaClient (advanced) Autowired To use a existing configured AwsLambdaClient as client. LambdaClient 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 proxyProtocol (proxy) To define a proxy protocol when instantiating the Lambda client. Enum values: HTTP HTTPS HTTPS Protocol accessKey (security) Amazon AWS Access Key. String secretKey (security) Amazon AWS Secret Key. String Required Lambda component options You have to provide the awsLambdaClient in the Registry or your accessKey and secretKey to access the Amazon Lambda service.. 8.6. Usage 8.6.1. Static credentials vs Default Credential Provider You have the possibility of avoiding the usage of explicit static credentials, by specifying the useDefaultCredentialsProvider option and set it to true. Java system properties - aws.accessKeyId and aws.secretKey Environment variables - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY. Web Identity Token from AWS STS. The shared credentials and config files. Amazon ECS container credentials - loaded from the Amazon ECS if the environment variable AWS_CONTAINER_CREDENTIALS_RELATIVE_URI is set. Amazon EC2 Instance profile credentials. For more information about this you can look at AWS credentials documentation 8.6.2. Message headers evaluated by the Lambda producer 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 createAlias CamelAwsLambdaFunctionVersion String The function version to set in the alias Yes createAlias CamelAwsLambdaAliasFunctionName String The function name to set in the alias Yes createAlias CamelAwsLambdaAliasFunctionDescription String The function description to set in the alias No deleteAlias CamelAwsLambdaAliasFunctionName String The function name of the alias Yes getAlias CamelAwsLambdaAliasFunctionName String The function name of the alias Yes listAliases CamelAwsLambdaFunctionVersion String The function version to set in the alias No 8.7. List of Avalaible Operations listFunctions getFunction createFunction deleteFunction invokeFunction updateFunction createEventSourceMapping deleteEventSourceMapping listEventSourceMapping listTags tagResource untagResource publishVersion listVersions createAlias deleteAlias getAlias listAliases 8.8. Examples 8.8.1. Producer Example To have a full understanding of how the component works, you may have a look at these integration tests . 8.8.2. Producer Examples CreateFunction: this operation will create a function for you in AWS Lambda from("direct:createFunction").to("aws2-lambda://GetHelloWithName?operation=createFunction").to("mock:result"); and by sending template.send("direct:createFunction", ExchangePattern.InOut, new Processor() { @Override public void process(Exchange exchange) throws Exception { exchange.getIn().setHeader(Lambda2Constants.RUNTIME, "nodejs6.10"); exchange.getIn().setHeader(Lambda2Constants.HANDLER, "GetHelloWithName.handler"); exchange.getIn().setHeader(Lambda2Constants.DESCRIPTION, "Hello with node.js on Lambda"); exchange.getIn().setHeader(Lambda2Constants.ROLE, "arn:aws:iam::643534317684:role/lambda-execution-role"); ClassLoader classLoader = getClass().getClassLoader(); File file = new File( classLoader .getResource("org/apache/camel/component/aws2/lambda/function/node/GetHelloWithName.zip") .getFile()); FileInputStream inputStream = new FileInputStream(file); exchange.getIn().setBody(inputStream); } }); 8.9. Using a POJO as body Sometimes build an AWS Request can be complex, because of multiple options. We introduce the possibility to use a POJO as body. In AWS Lambda there are multiple operations you can submit, as an example for Get Function request, you can do something like: from("direct:getFunction") .setBody(GetFunctionRequest.builder().functionName("test").build()) .to("aws2-lambda://GetHelloWithName?awsLambdaClient=#awsLambdaClient&operation=getFunction&pojoRequest=true") In this way you'll pass the request directly without the need of passing headers and options specifically related to this operation. 8.10. Dependencies Maven users will need to add the following dependency to their pom.xml. pom.xml <dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-aws2-lambda</artifactId> <version>USD{camel-version}</version> </dependency> where {camel-version} must be replaced by the actual version of Camel. 8.11. Spring Boot Auto-Configuration The component supports 17 options, which are listed below. Name Description Default Type camel.component.aws2-lambda.access-key Amazon AWS Access Key. String camel.component.aws2-lambda.autowired-enabled Whether autowiring is enabled. This is used for automatic autowiring options (the option must be marked as autowired) by looking up in the registry to find if there is a single instance of matching type, which then gets configured on the component. This can be used for automatic configuring JDBC data sources, JMS connection factories, AWS Clients, etc. true Boolean camel.component.aws2-lambda.aws-lambda-client To use a existing configured AwsLambdaClient as client. The option is a software.amazon.awssdk.services.lambda.LambdaClient type. LambdaClient camel.component.aws2-lambda.configuration Component configuration. The option is a org.apache.camel.component.aws2.lambda.Lambda2Configuration type. Lambda2Configuration camel.component.aws2-lambda.enabled Whether to enable auto configuration of the aws2-lambda component. This is enabled by default. Boolean camel.component.aws2-lambda.lazy-start-producer Whether the producer should be started lazy (on the first message). By starting lazy you can use this to allow CamelContext and routes to startup in situations where a producer may otherwise fail during starting and cause the route to fail being started. By deferring this startup to be lazy then the startup failure can be handled during routing messages via Camel's routing error handlers. Beware that when the first message is processed then creating and starting the producer may take a little time and prolong the total processing time of the processing. false Boolean camel.component.aws2-lambda.operation The operation to perform. It can be listFunctions, getFunction, createFunction, deleteFunction or invokeFunction. Lambda2Operations camel.component.aws2-lambda.override-endpoint Set the need for overidding the endpoint. This option needs to be used in combination with uriEndpointOverride option. false Boolean camel.component.aws2-lambda.pojo-request If we want to use a POJO request as body or not. false Boolean camel.component.aws2-lambda.proxy-host To define a proxy host when instantiating the Lambda client. String camel.component.aws2-lambda.proxy-port To define a proxy port when instantiating the Lambda client. Integer camel.component.aws2-lambda.proxy-protocol To define a proxy protocol when instantiating the Lambda client. Protocol camel.component.aws2-lambda.region The region in which Lambda client needs to work. When using this parameter, the configuration will expect the lowercase name of the region (for example ap-east-1) You'll need to use the name Region.EU_WEST_1.id(). String camel.component.aws2-lambda.secret-key Amazon AWS Secret Key. String camel.component.aws2-lambda.trust-all-certificates If we want to trust all certificates in case of overriding the endpoint. false Boolean camel.component.aws2-lambda.uri-endpoint-override Set the overriding uri endpoint. This option needs to be used in combination with overrideEndpoint option. String camel.component.aws2-lambda.use-default-credentials-provider Set whether the Lambda client should expect to load credentials through a default credentials provider or to expect static credentials to be passed in. false Boolean

Commands:
<dependency> <groupId>org.apache.camel.springboot</groupId> <artifactId>camel-aws2-lambda-starter</artifactId> </dependency>
aws2-lambda://functionName[?options]
aws2-lambda:function
from("direct:createFunction").to("aws2-lambda://GetHelloWithName?operation=createFunction").to("mock:result");
template.send("direct:createFunction", ExchangePattern.InOut, new Processor() { @Override public void process(Exchange exchange) throws Exception { exchange.getIn().setHeader(Lambda2Constants.RUNTIME, "nodejs6.10"); exchange.getIn().setHeader(Lambda2Constants.HANDLER, "GetHelloWithName.handler"); exchange.getIn().setHeader(Lambda2Constants.DESCRIPTION, "Hello with node.js on Lambda"); exchange.getIn().setHeader(Lambda2Constants.ROLE, "arn:aws:iam::643534317684:role/lambda-execution-role"); ClassLoader classLoader = getClass().getClassLoader(); File file = new File( classLoader .getResource("org/apache/camel/component/aws2/lambda/function/node/GetHelloWithName.zip") .getFile()); FileInputStream inputStream = new FileInputStream(file); exchange.getIn().setBody(inputStream); } });
from("direct:getFunction") .setBody(GetFunctionRequest.builder().functionName("test").build()) .to("aws2-lambda://GetHelloWithName?awsLambdaClient=#awsLambdaClient&operation=getFunction&pojoRequest=true")
<dependency> <groupId>org.apache.camel</groupId> <artifactId>camel-aws2-lambda</artifactId> <version>USD{camel-version}</version> </dependency>