ballerinax/awslambda : 1.0.0

Module Overview

This module offers the capabilities of creating AWS Lambda functions using Ballerina.

Annotation Usage Sample:

1import ballerinax/awslambda;
2import ballerina/uuid;
3import ballerina/io;
4
5// The `@awslambda:Function` annotation marks a function to
6// generate an AWS Lambda function
7@awslambda:Function
8public function echo(awslambda:Context ctx, json input) returns json {
9   return input;
10}
11
12@awslambda:Function
13public function uuid(awslambda:Context ctx, json input) returns json {
14   return uuid:createType1AsString();
15}
16
17// The `awslambda:Context` object contains request execution
18// context information
19@awslambda:Function
20public function ctxinfo(awslambda:Context ctx, json input) returns json|error {
21   json result = { RequestID: ctx.getRequestId(),
22                   DeadlineMS: ctx.getDeadlineMs(),
23                   InvokedFunctionArn: ctx.getInvokedFunctionArn(),
24                   TraceID: ctx.getTraceId(),
25                   RemainingExecTime: ctx.getRemainingExecutionTime() };
26   return result;
27}
28
29@awslambda:Function
30public function notifySQS(awslambda:Context ctx, 
31                          awslambda:SQSEvent event) returns json {
32    return event.Records[0].body;
33}
34
35@awslambda:Function
36public function notifyS3(awslambda:Context ctx, 
37                         awslambda:S3Event event) returns json {
38    return event.Records[0].s3.'object.key;
39}
40
41@awslambda:Function
42public function notifyDynamoDB(awslambda:Context ctx, 
43                               awslambda:DynamoDBEvent event) returns json {
44    return event.Records[0].dynamodb.Keys.toString();
45}
46
47@awslambda:Function
48public function notifySES(awslambda:Context ctx, 
49                          awslambda:SESEvent event) returns json {
50    return event.Records[0].ses.mail.commonHeaders.subject;
51}
52
53@awslambda:Function
54public function apigwRequest(awslambda:Context ctx, 
55                             awslambda:APIGatewayProxyRequest request) {
56    io:println("Path: ", request.path);
57}

The output of the bal build is as follows:

1$ bal build functions.bal 
2Compiling source
3    functions.bal
4
5Generating executable
6	functions.jar
7	@awslambda:Function: echo, uuid, ctxinfo, notifySQS, notifyS3
8
9	Run the following command to deploy each Ballerina AWS Lambda function:
10	aws lambda create-function --function-name $FUNCTION_NAME --zip-file fileb://aws-ballerina-lambda-functions.zip --handler functions.$FUNCTION_NAME --runtime provided --role $LAMBDA_ROLE_ARN --layers arn:aws:lambda:$REGION_ID:134633749276:layer:ballerina-jre11:6 --memory-size 512 --timeout 10
11
12	Run the following command to re-deploy an updated Ballerina AWS Lambda function:
13	aws lambda update-function-code --function-name $FUNCTION_NAME --zip-file fileb://aws-ballerina-lambda-functions.zip