React Native

Call an AWS Lambda Function

See more AWS Misc Examples

Demonstrates how to call an AWS Lambda function. React Native

import { AuthAws, JsonObject, Rest, StringBuilder } from '@chilkat/react-native'

async function chilkatExample() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const rest = new Rest();

  // Connect to the Amazon AWS REST server.
  // such as https://email.us-west-2.amazonaws.com/
  const bTls = true;
  const port = 443;
  const bAutoReconnect = true;

  // -------------------------------------------------------------------------------------------
  // Note: The source of the lambda function (hosted on AWS) is shown at the bottom of this page.
  // --------------------------------------------------------------------------------------------

  // If your lambda function URL is: https://itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws/
  // then use just the domain part here:
  await rest.connectAsync('itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws', port, bTls, bAutoReconnect);

  // Provide AWS credentials for the REST call.
  const authAws = new AuthAws();
  authAws.accessKey = 'AWS_ACCESS_KEY';
  authAws.secretKey = 'AWS_SECRET_KEY';
  // the region should match our domain above..
  authAws.region = 'us-west-2';
  authAws.serviceName = 'lambda';

  rest.setAuthAws(authAws);

  const json = new JsonObject();
  json.updateString('name', 'Benny');

  rest.addHeader('Content-Type', 'application/json');

  const sbRequestBody = new StringBuilder();
  json.emitSb(sbRequestBody);

  const sbResponseBody = new StringBuilder();
  try {
    await rest.fullRequestSbAsync('POST', '/', sbRequestBody, sbResponseBody);
  } catch {
    console.log(rest.lastErrorText);
    return;
  }

  const statusCode = rest.responseStatusCode;
  if (statusCode >= 400) {
    console.log(`Response Status Code: ${statusCode}`);
    console.log(`Response Body: ${sbResponseBody.getAsString()}`);
    console.log('Failed.');
    return;
  }

  console.log('Response Body:');
  console.log(sbResponseBody.getAsString());
}

JavaScript

export const handler = async (event) => {

    let body = "Hello World";

    if (event.body) {
        const input = JSON.parse(event.body);
        if (input.name) {
            body = "Hello " + input.name;
        }
    }

    return {
        statusCode: 200,
        headers: {
            "Content-Type": "application/json"
        },
        body: JSON.stringify({
            message: body
        })
    };
};