openapi-lambda-adapter

JavaScript/Typescript library for making AWS Lambda to Lambda calls via openapi-client-axios .

Features

• Easy to make API like calls via openapi-client-axios library.

1  client.api.registerRunner(getLambdaRunner('target-lambda-name'))

• Use your API clients from OpenAPI v3 definitions to make AWS Lambda to Lambda calls between your platform microservices.
  • client.getPet(1)
  • client.searchPets()
  • client.searchPets({ ids: [1, 2, 3] })
  • client.updatePet(1, payload)
• No need to run your requests via Api Gateway, you can directly run microservice to microservice call, i.e. AWS Lambda to Lambda, by leveraging AWS backbone infrastructure.
• Leverage AWS IAM for permission management. Eg:

1  Resources:
2    MyLambda:
3      Type: AWS::Serverless::Function
4      Properties:
5        ...
6        Policies:
7          - LambdaInvokePolicy:
8              FunctionName: target-lambda-name

Restrictions

• To run in AWS Lambda with Nodejs Runtime Environment >= 12

Quick Start

npm install --save openapi-client-axios openapi-lambda-adapter

Setup for single lambda handling all API Gateway requests

1import OpenAPIClientAxios from 'openapi-client-axios';
2import { getLambdaRunner } from 'openapi-lambda-adapter';
3
4const api = new OpenAPIClientAxios({ definition: 'https://example.com/api/openapi.json' });
5const client = api.initSync();
6client.api.registerRunner(getLambdaRunner('target-lambda-name'));
7
8const res = await client.createPet(null, { name: 'Garfield' });
9console.log('Pet created', res.data);

Setup for multiple lambdas, each lambda handling one API Gateway resource

1import OpenAPIClientAxios from 'openapi-client-axios';
2import { getLambdaRunner } from 'openapi-lambda-adapter';
3
4const api = new OpenAPIClientAxios({ definition: 'https://example.com/api/openapi.json' });
5const client = api.initSync();
6client.api.getOperations().forEach((operation) => {
7    const lambdaName = ... get lambda-name for operationId
8    client.api.registerRunner(getLambdaRunner(lambdaName), operation.operationId)
9  })
10
11const res = await client.createPet(null, { name: 'Garfield' });
12console.log('Pet created', res.data);
13
14const resp = await client.getPet({ id: 1 }, null);
15console.log('Pet retrieved', resp.data);