Exemplo de Lambda

1. Para a construção de um Lambda" é necessário o descritor de pacote "template.yaml".

Lembrando que a classe que implementa "RequestStreamHandler" será "Singleton" até a JVM sair da instancia (kill).

AWSTemplateFormatVersion: 2010-09-09
Transform: AWS::Serverless-2016-10-31

Resources:
  DroolsFunction:
    Type: 'AWS::Serverless::Function'
    Properties:
      Handler: 'com.github.frkr.DroolsHandler'
      CodeUri: ./target/lambda.jar
      MemorySize: 256
      Timeout: 60
      Runtime: java8

O pacote abaixo foi para suprir a necessidade de log.

<dependency>
    <groupId>io.symphonia</groupId>
    <artifactId>lambda-logging</artifactId>
    <version>1.0.0</version>
</dependency>

2. Usando o "Maven Shade", fará um pacote único de jar.

Terminando o exemplo de Lambda, continuei com o exemplo de Drools.

Drools

O arquivo "kmodule.xml" foi necessário para o Drools funcionar. Não testei se as regras podem ficar em outro diretório que não seja o "rules/". O pacote das regras esta como "com.sample" para exemplificar o DRL com o uso de "import".

Neste exemplo, o Drools executa as regras no classpath simples assim:

KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-rules");

kSession.fireAllRules();

TODO: Fazer o Lambda receber um JSON com o DRL, executar e devolver outro JSON.

---

Comandos úteis:

Build

mvn clean package shade:shade

Local Run (sam is broken)

sam local invoke -e event.json

LIST Functions

aws lambda list-functions

Create Function

aws lambda create-function --function-name DroolsFunction --runtime java8 --role arn:aws:iam::827387554119:role/service-role/microservice --handler com.github.frkr.DroolsHandler --zip-file fileb://`pwd`/target/lambda.jar   

Update Function

aws lambda update-function-code --function-name DroolsFunction --zip-file fileb://`pwd`/target/lambda.jar

Invoke

aws lambda invoke --function-name DroolsFunction --payload '{"teste":"sim"}' output.log

Create API Gateway

aws apigateway create-rest-api --name 'DroolsFunction'

Get Resources

aws apigateway get-resources --rest-api-id gd4v1lrjjd

Create Resource

aws apigateway create-resource --rest-api-id gd4v1lrjjd --parent-id q5nlsd6eu5 --path-part 'drools'

Create API Method

aws apigateway put-method --rest-api-id gd4v1lrjjd --resource-id hlv8n6 \
--http-method POST --authorization-type "NONE" --no-api-key-required \
--request-parameters "method.request.header.custom-header=false"

Create Integration

aws apigateway put-integration --rest-api-id gd4v1lrjjd --resource-id hlv8n6 \
--http-method POST --type AWS --integration-http-method POST \
--uri 'arn:aws:apigateway:sa-east-1:lambda:path/2015-03-31/functions/arn:aws:lambda:sa-east-1:827387554119:function:DroolsFunction/invocations'

--uri 'arn:aws:lambda:sa-east-1:827387554119:function:DroolsFunction'

Delete or Update

 delete-integration \
aws apigateway \
 get-integration \
--rest-api-id gd4v1lrjjd \
--resource-id hlv8n6 \
--http-method POST 

Method response

aws apigateway \
put-method-response \
--rest-api-id gd4v1lrjjd \
--resource-id hlv8n6 \
--http-method POST \
--status-code 200

Integration (not working using cli)

aws apigateway put-integration-response --rest-api-id gd4v1lrjjd --resource-id hlv8n6 \
 --http-method POST --status-code 200 --selection-pattern "" --response-templates '{"application/json": "{\"json\": \"template\"}"}'


aws apigateway \
 get-integration-response \
--rest-api-id gd4v1lrjjd \
--resource-id hlv8n6 \
--http-method POST \
--status-code 200

aws apigateway create-deployment --rest-api-id gd4v1lrjjd --region sa-east-1

aws apigateway update-stage --region <region> \
    --rest-api-id <rest-api-id> \ 
    --stage-name <stage-name> \ 
    --patch-operations op='replace',path='/deploymentId',value='<deployment-id>'

POST

curl -i -X POST -H "Content-Type:application/json" -d "{  \"nome\" : \"Davi\" }" https://gd4v1lrjjd.execute-api.sa-east-1.amazonaws.com/prod/drools