Java

Call an AWS Lambda Function

See more AWS Misc Examples

Demonstrates how to call an AWS Lambda function. Chilkat2 Java

import com.chilkatsoft.chilkat2.AuthAws;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Rest;
import com.chilkatsoft.chilkat2.StringBuilder;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Rest rest = new Rest();

        // Connect to the Amazon AWS REST server.
        // such as https://email.us-west-2.amazonaws.com/
        boolean bTls = true;
        int port = 443;
        boolean 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:
        rest.connect("itwxyj3vd6gjtaerbfqnfccs2e0fplzh.lambda-url.us-west-2.on.aws", port, bTls, bAutoReconnect);

        // Provide AWS credentials for the REST call.
        AuthAws authAws = new AuthAws();
        authAws.setAccessKey("AWS_ACCESS_KEY");
        authAws.setSecretKey("AWS_SECRET_KEY");
        // the region should match our domain above..
        authAws.setRegion("us-west-2");
        authAws.setServiceName("lambda");

        rest.setAuthAws(authAws);

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

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

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

        StringBuilder sbResponseBody = new StringBuilder();
        try {
            rest.fullRequestSb("POST", "/", sbRequestBody, sbResponseBody);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        int statusCode = rest.getResponseStatusCode();
        if (statusCode >= 400) {
            System.out.println("Response Status Code: " + statusCode);
            System.out.println("Response Body: " + sbResponseBody.getAsString());
            System.out.println("Failed.");
            return;
        }

        System.out.println("Response Body:");
        System.out.println(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
        })
    };
};